2024-03-29T12:22:25Zhttps://minerva.usc.es/oai/requestoai:minerva.usc.es:10347/184592020-01-31T13:50:35Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Spanish university study ignores research
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
2019-03-21T13:54:48Z
2019-03-21T13:54:48Z
2019-03-21T13:54:48Z
2000-03-16
journal article
Mira Pérez, J (2000). Spanish university study ignores research. Nature. Vol. 404, p. 222
1476-4687
http://hdl.handle.net/10347/18459
10.1038/35005266
eng
https://doi.org/10.1038/35005266
open access
© 2000 Nature
Springer Nature
oai:minerva.usc.es:10347/226512020-07-07T11:35:54Zcom_10347_2989com_10347_2889com_10347_227com_10347_2919com_10347_2891com_10347_2888com_10347_2925col_10347_9764col_10347_10699col_10347_9937
High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method
Rivas Murias, Beatriz
Vila Fungueiriño, José Manuel
Rivadulla Fernández, José Francisco
Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
Solid-state chemistry
Thermoelectrics
Misfit cobaltates ([Bi/Ba/Sr/Ca/CoO]nRS[CoO2]q) constitute the most promising family of thermoelectric oxides for high temperature energy harvesting. However, their complex structure and chemical composition makes extremely challenging their deposition by high-vacuum physical techniques. Therefore, many of them have not been prepared as thin films until now. Here we report the synthesis of high-quality epitaxial thin films of the most representative members of this family of compounds by a water-based chemical solution deposition method. The films show an exceptional crystalline quality, with an electrical conductivity and thermopower comparable to single crystals. These properties are linked to the epitaxial matching of the rock-salt layers of the structure to the substrate, producing clean interfaces free of amorphous phases. This is an important step forward for the integration of these materials with complementary n-type thermoelectric oxides in multilayer nanostructures
2020-05-28T19:09:00Z
2020-05-28T19:09:00Z
2020-05-28T19:09:00Z
2015
journal article
Rivas-Murias, B., Manuel Vila-Fungueiriño, J. & Rivadulla, F. High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method. Sci Rep 5, 11889 (2015). https://doi.org/10.1038/srep11889
http://hdl.handle.net/10347/22651
10.1038/srep11889
2045-2322
eng
https://doi.org/10.1038/srep11889
http://creativecommons.org/licenses/by/4.0/
open access
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Nature Publishing Group
oai:minerva.usc.es:10347/159622023-07-10T06:12:17Zcom_10347_2988com_10347_2889com_10347_227com_10347_2919com_10347_2891com_10347_2888com_10347_2925col_10347_11762col_10347_10699col_10347_9937
Analysis of the temperature dependence of the thermal conductivity of insulating single crystal oxides
Langenberg Pérez, Eric
Ferreiro Vila, Elías
Leborán Alvarez, Víctor
Fumega, Adolfo
Pardo, Victor
Rivadulla Fernández, José Francisco
Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
Thermal conductivity
Dielectric oxides
Vacancies
Epitaxy
Phonons
The temperature dependence of the thermal conductivity of 27 different single crystal oxides is reported from ≈20 K to 350 K. These crystals have been selected among the most common substrates for growing epitaxial thin-film oxides, spanning over a range of lattice parameters from ≈3.7 Å to ≈12.5 Å. Different contributions to the phonon relaxation time are discussed on the basis of the Debye model. This work provides a database for the selection of appropriate substrates for thin-film growth according to their desired thermal properties, for applications in which heat management is important
2017-10-21T12:45:33Z
2017-10-21T12:45:33Z
2017-10-21T12:45:33Z
2016-10
journal article
http://hdl.handle.net/10347/15962
10.1063/1.4966220
2166-532X
eng
http://dx.doi.org/10.1063/1.4966220
info:eu-repo/grantAgreement/EC/FP7/259082
open access
© 2016 AIP Publishing
AIP Publishing LLC
oai:minerva.usc.es:10347/240252021-01-09T03:07:46Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Design of Spatial-Mode (De)Multiplexer for Few-Mode Fibers Based on a Cyclically Used Michelson-Like Interferometer
Prieto Blanco, Xesús
Montero Orille, Carlos
Moreno de las Cuevas, Vicente
Nistal Fernández, María Concepción
Mouriz Cereijo, María Dolores
Liñares Beiras, Jesús
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Optical fibers
Space division multiplexing
Few mode fibers
Mode sorting
Interferometers
Few mode optical fibers are a promising way to continue increasing the data rate in optical communications. However, an efficient method to launch and extract separately each mode is essential. The design of a interferometric spatial mode (de)multiplexer for few mode optical fibers is presented. It is based on a single Michelson-like interferometer which consists of standard optical elements and has a reflective image inverter in one arm. Particular care has been taken in its design so that both polarizations behave the same. Moreover, this interferometer can process several pairs of modes simultaneously. The multiplexer also consists of: a phase plate, focusing optics at both ports of the interferometer and elliptical core fibers to recirculate some outputs. It can multiplex ten spatial and polarization modes and it presents low losses and no intrinsic crosstalk between modes. Additionally, it is polarization insensitive, achromatic, compact and inexpensive. The same system can work as a demultiplexer when used in reverse. In this case, both the losses and the crosstalk remain very low. Similar designs that perform other functions, like an add-drop mode multiplexing, are also suggested
2020-12-16T12:43:18Z
2020-12-16T12:43:18Z
2020-12-16T12:43:18Z
2020
journal article
Prieto-Blanco, X.; Montero-Orille, C.; Cuevas, V.M.L.; Nistal, M.C.; Mouriz, D.; Liñares, J. Design of Spatial-Mode (De)Multiplexer for Few-Mode Fibers Based on a Cyclically Used Michelson-Like Interferometer. Appl. Sci. 2020, 10, 8584
http://hdl.handle.net/10347/24025
10.3390/app10238584
2076-3417
eng
https://doi.org/10.3390/app10238584
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/284182022-04-27T02:02:58Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Positioning of diffuse metallic target with a point diffractive interferometer
Arines Piferrer, Justo
Candal Parafita, Alba
Martín Iglesias, José Luis
Universidade de Santiago de Compostela. Departamento de Física Aplicada
2022-04-26T07:20:27Z
2022-04-26T07:20:27Z
2022-04-26T07:20:27Z
2022
journal article
Optics and Lasers in Engineering 154 (2022) 107041
0143-8166
http://hdl.handle.net/10347/28418
10.1016/j.jasrep.2022.103368
eng
https://doi.org/10.1016/j.optlaseng.2022.107041
http://creativecommons.org/licenses/by/4.0/
open access
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/184132022-08-29T11:33:43Zcom_10347_15635com_10347_15468com_10347_227com_10347_2955com_10347_2893com_10347_2888com_10347_2919com_10347_2891col_10347_15636col_10347_12262col_10347_10699oai:minerva.usc.es:10347/292442023-07-10T06:11:04Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Anomalous response in the orbital magnetic susceptibility of 2d topological systems
Faílde Balea, Daniel
Baldomir Fernández, Daniel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Berry curvature
Orbital susceptibility
Topological insulators
2D compounds with nonzero Berry curvature are ideal systems to study exotic and technologically favorable thermoelectric and magnetoelectric properties. Within this class of materials, the topological trivial and nontrivial regimes have to present very different behaviors, which are encoded for the orbital susceptibility and magnetization. To try to reveal them, it is found that it was necessary to introduce a k-dependent mass term in the relativistic formalism of these materials. Thus, while a topologically trivial insulator is predicted to have a very limited response, in the nontrivial regime, a singular contribution to the orbital magnetic susceptibility, which is inversely proportional to the square of the quantum magnetic flux is unveiled. In this scenario, besides determining the measurement conditions a new route for enhancing the intrinsic orbital magnetism of topological materials widening the range of temperatures and magnetic fields without involving tiny bandgaps is found
2022-09-23T08:57:53Z
2022-09-23T08:57:53Z
2022-09-23T08:57:53Z
2022
journal article
Phys. Status Solidi RRL 2022,16, 2200065. DOI: 10.1002/pssr.202200065
1862-6254
http://hdl.handle.net/10347/29244
10.1002/pssr.202200065
1862-6270
eng
https://doi.org/10.1002/pssr.202200065
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104150RB-I00/ES/MATERIALES FUNCIONALES PARA EL CONTROL ACTIVO DE LA CONDUCTIVIDAD TERMICA
info:eu-repo/grantAgreement/ES/MINECO/MAT2016-80762-R
http://creativecommons.org/licenses/by/4.0/
open access
© 2022 The Authors. physica status solidi (RRL) Rapid Research Letters published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Atribución 4.0 Internacional
Wiley
oai:minerva.usc.es:10347/267402023-07-10T06:11:00Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2925com_10347_2927col_10347_10699col_10347_9937col_10347_12292
Highly Hydrophilic and Lipophilic Derivatives of Bile Salts
Vázquez Tato, María del Pilar
Seijas Vázquez, Julio Antonio
Meijide del Río, Francisco Ángel
Fraga López, Francisco José
Frutos del Río, Santiago de
Miragaya Otero, Javier
Trillo Novo, Juan Ventura
Jover Ramos, Aida
Soto Tellini, Victor Hugo
Vázquez Tato, José
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
Universidade de Santiago de Compostela. Departamento de Química Orgánica
Bile acids and salts
Partition coefficient
Isothermal titration calorimetry
Hydrophilic-lipophilic balance
Lipophilicity
Demicellization thermodynamics
Lipophilicity of 15 derivatives of sodium cholate, defined by the octan-1-ol/water partition coefficient (log P), has been theoretically determined by the Virtual log P method. These derivatives bear highly hydrophobic or highly hydrophilic substituents at the C3 position of the steroid nucleus, being linked to it through an amide bond. The difference between the maximum value of log P and the minimum one is enlarged to 3.5. The partition coefficient and the critical micelle concentration (cmc) are tightly related by a double-logarithm relationship (VirtuallogP=−(1.00±0.09)log(cmcmM)+(2.79±0.09)), meaning that the Gibbs free energies for the transfer of a bile anion from water to either a micelle or to octan-1-ol differ by a constant. The equation also means that cmc can be used as a measurement of lipophilicity. The demicellization of the aggregates formed by three derivatives of sodium cholate bearing bulky hydrophobic substituents has been studied by surface tension and isothermal titration calorimetry. Aggregation numbers, enthalpies, free energies, entropies, and heat capacities, ΔCP,demic, were obtained. ΔCP,demic, being positive, means that the interior of the aggregates is hydrophobic
2021-08-10T12:38:46Z
2021-08-10T12:38:46Z
2021-08-10T12:38:46Z
2021
journal article
Int. J. Mol. Sci. 2021, 22(13), 6684; https://doi.org/10.3390/ijms22136684
http://hdl.handle.net/10347/26740
10.3390/ijms22136684
1422-0067
eng
https://doi.org/10.3390/ijms22136684
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/MAT2017-86109P/ES/ESTRUCTURAS SUPRAMOLECULARES GENERADAS POR ACIDOS BILIARES MODIFICADOS Y ESTUDIO DE SUS APLICACIONES BIOLOGICAS
http://creativecommons.org/licenses/by/4.0/
open access
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/184432020-01-31T13:38:47Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Domingo de Soto, early dynamics theorist
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Domingo de Soto
2019-03-21T13:21:00Z
2019-03-21T13:21:00Z
2019-03-21T13:21:00Z
2009
journal article
Mira Pérez, J (2009). Domingo de Soto, early dynamics theorist. Physics Today 62, 1, 9; doi: 10.1063/1.3074244
0031-9228
http://hdl.handle.net/10347/18443
10.1063/1.3074244
eng
https://doi.org/10.1063/1.3074244
open access
© 2009 American Institute of Physics
AIP Publishing
oai:minerva.usc.es:10347/218022020-09-03T11:45:49Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Strehl ratios characterizing optical elements designed for presbyopia compensation
Petelczyc, K.
Ares García, Jorge
Bará Viñas, Salvador Xurxo
Jaroszewicz, Z.
Kakarenko, K.
Kolodziejczyk, A.
Sypek, M.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Geometric optical design
Image formation theory
Vision modelling
Visual optics
Aging changes
We present results of numerical analysis of the Strehl ratio characteristics for the light sword optical element (LSOE). For comparison there were analyzed other optical imaging elements proposed for compensation of presbyopia such as the bifocal lens, the trifocal lens, the stenopeic contact lens, and elements with extended depth of focus (EDOF), such as the logarithmic and quartic axicons. The simulations were based on a human eye’s model being a simplified version of the Gullstrand model. The results obtained allow to state that the LSOE exhibits much more uniform characteristics of the Strehl ratio comparing with other known hitherto elements and therefore it could be a promising aid to compensate for the insufficient accommodation range of the human eye.
2020-04-27T14:10:23Z
2020-04-27T14:10:23Z
2020-04-27T14:10:23Z
2011
journal article
K. Petelczyc, J. Ares García, S. Bará, Z. Jaroszewicz, K. Kakarenko, A. Kolodziejczyk, and M. Sypek, "Strehl ratios characterizing optical elements designed for presbyopia compensation," Opt. Express 19, 8693-8699 (2011)
http://hdl.handle.net/10347/21802
10.1364/OE.19.008693
1094-4087
eng
https://doi.org/10.1364/OE.19.008693
https://creativecommons.org/licenses/by/4.0/
open access
@2011 Optical Society of America. This article is under a Creative Commons Attribution 4.0 International License (CC BY 4.0)
OSA Publishing
oai:minerva.usc.es:10347/291842022-08-31T02:02:44Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Are Dutch and French languages miscible?
Seoane Iglesias, Luís F.
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
French and Dutch are two languages of different origins (Germanic vs. Romance) that coexist within the nation-state of Belgium. While they are mostly segregated throughout the Belgian territory, in Brussels they reach an actual cohabitation with a relevant bilingual population. The dominant language in Brussels shifted from Dutch to French during the late XIX century in a process known as the Francization of Brussels. The fractions of speakers of each language and of bilinguals over that time were recorded periodically until political tensions ended the censuses in the country. This relevant linguistic shift has been the object of sociopolitical studies, but the available empirical data have never before been analyzed using a theoretical mathematical model that would allow us to quantify causal factors behind the observed dynamics. Here we carry out such study for the first time, measuring effective values of perceived interlinguistic similarity and language prestige, among others. This modeling and quantification allows us to speculate about possible trajectories of fractions of speakers over time—specifically, whether Dutch and French tend to be languages that can coexist in the long term. We find that there is an overall tendency of both tongues to grow segregated over time, suggesting, in physics terms, that Dutch and French are not miscible. The scenarios that would allow for language coexistence would often see a starkly dominating language. Notwithstanding, we also discuss the costs of attempting to sustain the cohabitation despite a natural tendency to the contrary
2022-08-30T12:31:31Z
2022-08-30T12:31:31Z
2022-08-30T12:31:31Z
2022
journal article
The European Physical Journal Plus 137, 836 (2022). https://doi.org/10.1140/epjp/s13360-022-03020-y
http://hdl.handle.net/10347/29184
10.1140/epjp/s13360-022-03020-y
2190-5444
eng
https://doi.org/10.1140/epjp/s13360-022-03020-y
http://creativecommons.org/licenses/by/4.0/
open access
© The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
Atribución 4.0 Internacional
Springer
oai:minerva.usc.es:10347/235232023-07-10T06:18:01Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2927col_10347_10699col_10347_12292
Extraction and Physicochemical Characterization of Chitin Derived from the Asian Hornet, Vespa velutina Lepeletier 1836 (Hym.: Vespidae)
Feás Sánchez, Xesús
Vázquez Tato, María del Pilar
Seijas Vázquez, Julio Antonio
Nikalje, Anna Pratima G.
Fraga López, Francisco José
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Orgánica
Chitin
Vespa velutina
Asian hornet
Polymer
Invasive species
Insects
Fifteen years ago, at least one multimated female yellow-legged Asian hornet (Vespa velutina Lepeletier 1836) arrived in France, which gave rise to a pan-European invasion. In this study, the isolation and characterization of chitin (CHI) that was obtained from Vespa velutina (CHIVV) is described. In addition, an easy procedure is carried out to capture the raw insect, selectively and with high rates of success. The chitin contents of dry VV was observed to be 11.7%. Fourier transform infrared spectroscopy (FTIR), solid-state NMR (ssNMR), elemental analysis (EA), scanning electron microscopy (SEM), and thermogravimetric analysis (TG) characterized the physicochemical properties of CHIVV. The obtained CHIVV is close to pure (43.47% C, 6.94% H, and 6.85% N), and full acetylated with a value of 95.44%. Additionally, lifetime and kinetic parameters such as activation E and the frequency factor A using model-free and model-fitting methods, were determined. For CHIVV the solid state mechanism that follows the thermodegradation is of type F2 (random nucleation around two nuclei). The invasive Asian hornet is a promising alternative source of CHI, based on certain factors, such as the current and probable continued abundance of the quantity and quality of the product obtained
2020-11-02T12:02:31Z
2020-11-02T12:02:31Z
2020-11-02T12:02:31Z
2020
journal article
Feás, X.; Vázquez-Tato, M.P.; Seijas, J.A.; Pratima G. Nikalje, A.; Fraga-López, F. Extraction and Physicochemical Characterization of Chitin Derived from the Asian Hornet, Vespa velutina Lepeletier 1836 (Hym.: Vespidae). Molecules 2020, 25, 384
http://hdl.handle.net/10347/23523
10.3390/molecules25020384
1420-3049
eng
https://doi.org/10.3390/molecules25020384
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2017-86109-P/ES/ESTRUCTURAS SUPRAMOLECULARES GENERADAS POR ACIDOS BILIARES MODIFICADOS Y ESTUDIO DE SUS APLICACIONES
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/320882024-03-04T08:23:24Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Comparison between Thermophysical and Tribological Properties of Two Engine Lubricant Additives: Electrochemically Exfoliated Graphene and Molybdenum Disulfide Nanoplatelets
García Guimarey, María Jesús
Abdelkader, Amor M.
Comuñas, Maria JP
Álvarez Lorenzo, Carmen Isabel
Thomas, Ben
Fernández, Josefa
Hadfield, Mark
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Engine oil
Graphene Nanoplatelets
Molybdenum Disulfide Nanoplatelets
Tribological properties
Recently graphene and other 2D materials were suggested as nano additives to enhance the performance of nanolubricants and reducing friction and wear-related failures in moving mechanical parts. Nevertheless, to our knowledge there are no previous studies on electrochemical exfoliated nanomaterials as lubricant additives. In this work, engine oil-based nanolubricants were developed via two-steps method using two different 2D nanomaterials: a carbon-based nano additive, graphene nanoplatelets (GNP) and a sulphide nanomaterial, molybdenum disulfide (MoS2) nanoplatelets (MSNP). The influence of these nano additives on the thermophysical properties of the nanolubricants, such as viscosity index, density and wettability, was investigated. The unique features of the electrochemical exfoliated GNP and MSNP allow the formulation of nanolubricant with unusual thermophysical properties. Both the viscosity and density of the nanolubricants decreased by increasing the nanoplatelets loading. The effect of the nano additives loading and temperature on the tribological properties of nanolubricants was investigated using two different test configurations: reciprocating ball-on-plate and rotational ball-on-three-pins. The tribological specimens were analysed by scanning electron microscopy (SEM) and 3D profiler in order to evaluate the wear. The results showed significant improvement in the antifriction and anti-wear properties, for the 2D-materials-based nanolubricants as compared with the engine oil, using different contact conditions. For the reciprocal friction tests, maximum friction and worn area reductions of 20% and 22% were achieved for the concentrations of 0.10 wt% and 0.20 wt% GNP, respectively. Besides, the best anti-wear performance was found for the nanolubricant containing 0.05 wt% MSNP in rotational configuration test, with reductions of 42% and 60% in the scar width and depth, respectively, with respect to the engine oil.
2024-01-30T10:43:23Z
2024-01-30T10:43:23Z
2024-01-30T10:43:23Z
2020-10-12
journal article
Guimarey MJG, Abdelkader AM, Comuñas MJP, Alvarez-Lorenzo C, Thomas B, Fernández J, Hadfield M. Comparison between thermophysical and tribological properties of two engine lubricant additives: electrochemically exfoliated graphene and molybdenum disulfide nanoplatelets. Nanotechnology. 2021 Jan 8;32(2):025701. doi: 10.1088/1361-6528/abb7b1. PMID: 32916677.
0957-4484
http://hdl.handle.net/10347/32088
10.1088/1361-6528/abb7b1
1361-6528
eng
https://iopscience.iop.org/article/10.1088/1361-6528/abb7b1
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
Atribución-NoComercial-CompartirIgual 4.0 Internacional
IOP Publishing
oai:minerva.usc.es:10347/227532023-07-10T06:21:40Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Interferometric space-mode multiplexing based on binary phase plates and refractive phase shifters
Liñares Beiras, Jesús
Prieto Blanco, Xesús
Moreno de las Cuevas, Vicente
Montero Orille, Carlos
Mouriz Cereijo, María Dolores
Nistal Fernández, María Concepción
Barral Raña, David
Universidade de Santiago de Compostela. Departamento de Física Aplicada
A Mach-Zehnder interferometer (MZI) that includes in an arm either a reflective image inverter or a Gouy phase shifter (RGPS) can (de)multiplex many types of modes of a few mode fiber without fundamental loss. The use of RGPSs in combination with binary phase plates for multiplexing purposes is studied for the first time, showing that the particular RGPS that shifts π the odd modes only multiplexes accurately low order modes. To overcome such a restriction, we present a new exact refractive image inverter, more compact and flexible than its reflective counterpart. Moreover, we show that these interferometers remove or reduce the crosstalk that the binary phase plates could introduce between the multiplexed modes. Finally, an experimental analysis of a MZI with both an approximated and an exact refractive image inverter is presented for the case of a bimodal multiplexing. Likewise, it is proven experimentally that a RGPS that shifts π/2 demultiplexes two odd modes which can not be achieved by any image inverter.
2020-06-01T22:15:02Z
2020-06-01T22:15:02Z
2020-06-01T22:15:02Z
2017
journal article
Jesús Liñares, Xesús Prieto-Blanco, Vicente Moreno, Carlos Montero-Orille, Dolores Mouriz, María C. Nistal, and David Barral, "Interferometric space-mode multiplexing based on binary phase plates and refractive phase shifters," Opt. Express 25, 10925-10938 (2017)
http://hdl.handle.net/10347/22753
10.1364/OE.25.010925
1094-4087
eng
https://doi.org/10.1364/OE.25.010925
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2013-46584-C2-1-R/ES/CONVERSORES DE MODOS OPTICOS POR INTERCAMBIO IONICO, RECOMBINADORES INTERFEROMETRICOS Y CONECTORES POR ESCRITURA LASER
open access
© 2017 Optical Society of America. Open Access. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
Optical Society of America
oai:minerva.usc.es:10347/321532024-02-01T01:03:05Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Tribological performance of silicon nitride and carbon black Ionanofluids based on 1-ethyl-3-methylimidazolium methanesulfonate
Vallejo, Javier P.
Liñeira del Río, José M.
Fernández, Josefa
Lugo, Luis
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Tribological properties
1-Ethyl-3-methylimidazolium methanesulfonate
Friction
Ionanofluids
Nanolubricants
Development of nano-lubricants by the dispersion of nano-particles in current lubricants has contributed to improving energy efficiency reducing wear and friction. During the last two decades, ionic liquids have evolved as novel lubricants or lubricant additives, especially for high vacuum and high temperature. Nevertheless, the number of experimental studies regarding the tribological properties of Ionanofluids, defined as dispersions of nano-particles in ionic liquids, is limited. 1-Ethyl-3-methylimidazolium methanesulfonate, [EMIM][MS], is a promising candidate for lubrication applications due to its wide liquid range, high thermal conductivity, low friction coefficients and low compressibility in comparison with commercial mineral and synthetic hydrocarbon based lubricants. In this work, Ionanofluid lubricants based on dispersions of nano-additives (silicon nitride and carbon black) at mass concentration between 0.10 and 1.0 wt% in [EMIM][MS] were designed. The nearly spherical morphology of the nano-additives, silicon nitride and carbon black, was described by using scanning electron microscopy. The stabilities of the resulting nano-particle dispersions in the ionic liquid were analyzed by dynamic light scattering measurements of size for one month. Tribological characterization was performed by a rotational rheometer coupled with a tribology cell with ball-on-three-pins configuration (100Cr6 steel) in sliding conditions at 298.15 and 353.15 K. Afterwards, the wear track morphology of the worn pins was analyzed by a 3D optical profiler and Raman spectroscopy. The dispersions at the optimal nano-additive concentrations for lubrication reached friction coefficient decreases of up to 16% and wear tracks with a volume 28 times lower. Additionally, the density and dynamic viscosity of [EMIM][MS] and the optimal Ionanofluids for lubrication applications measured with a rotational Stabinger visco-densimeter in the 278.15 to 373.15 K temperature range showed small increases with almost no dependence on temperature.
2024-01-31T11:25:16Z
2024-01-31T11:25:16Z
2024-01-31T11:25:16Z
2020-09-23
journal article
0167-7322
http://hdl.handle.net/10347/32153
10.1016/j.molliq.2020.114335
1873-3166
eng
https://doi.org/10.1016/j.molliq.2020.114335
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
CC BY-NC-ND
Elsevier
oai:minerva.usc.es:10347/252062023-07-10T06:16:31Zcom_10347_2899com_10347_2890com_10347_2888com_10347_227com_10347_20714com_10347_2889com_10347_2919com_10347_2891col_10347_13398col_10347_20715col_10347_10699
An Improved Pattern Synthesis Iterative Method in Planar Arrays for Obtaining Efficient Footprints with Arbitrary Boundaries
Salas Sánchez, Aarón Ángel
López Álvarez, Cibrán
Rodríguez González, Juan Antonio
López Martín, María Elena
Ares Pena, Francisco José
Universidade de Santiago de Compostela. Departamento de Ciencias Morfolóxicas
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Instituto Interdisciplinar de Tecnoloxías Ambientais (CRETUS)
Antenna arrays
Pattern synthesis
Footprint patterns
In the present paper, an iterative technique devoted to reproducing efficient footprints with arbitrary boundaries for planar arrays is addressed. The methodology here depicted is based on exploiting the nature of the continuous aperture distribution by expressing it as a Fourier series of moderately high orders. In this manner, the resulting illumination boundary is defined by a target three-dimensional flat-topped pattern composed of stretching and shrinking modified circular Taylor patterns and the maximum order of the series to obtain a good reconstruction is determined by means of the iterative process. Examples and comparisons with the previous literature were conducted by analyzing square and rectangular contoured beams as test cases. Additionally, interesting potentials regarding space applications from a geostationary satellite are outlined by means of the EuTELSAT (European Telecommunications Satellite Organization) European coverage case study. In such a way, its numerical approach was analyzed by including subarray architectures and discussing improvements about dynamic range ratio of the excitations without critical power losses within the illumination region
2021-03-31T10:36:54Z
2021-03-31T10:36:54Z
2021-03-31T10:36:54Z
2021
journal article
Sensors 2021, 21(7), 2358; https://doi.org/10.3390/s21072358
http://hdl.handle.net/10347/25206
10.3390/s21072358
1424-8220
eng
https://doi.org/10.3390/s21072358
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/TEC2017-86110-R/ES/DETERMINACION DEL NIVEL DE CONCENTRACION DE PARTICULAS ATMOSFERICAS CON ANTENAS: METODO DE MONITORIZACION PARA DESARROLLAR UNA ESTRATEGIA DE PROTECCION INTEGRAL DEL CIUDADANO
http://creativecommons.org/licenses/by/4.0/
open access
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/321302024-02-01T01:03:16Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
An experimental and computational study on the material dispersion of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids
Rodríguez-Fernández, Carlos Damián
Arosa Lobato, Yago
Algnamat, Bilal Saleh Mohammad
López Lago, Elena
Fuente Carballo, Raúl de la
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Alkyls
Ionic liquids
Methylimidazolium tetrafluoroborate
The material dispersion of the [Ckmim][BF4] (k = 2, 3, 4, 6, 7, 8, 10) family of ionic liquids is measured at several temperatures over a broad spectral range from 300 nm to 1550 nm. The experimental curves are fitted to a modified three-resonance Sellmeier model to understand the effects of temperature and alkyl chain length on the dispersion behaviour. From the parameters of the fitting, we analyze the influence that the different constituents of these ionic liquids have on the dispersion behaviour. In addition, a semi-empirical approach combining simulated electronic polarizabilities and experimental densities for predicting the material dispersion is successfully tested by using a direct comparison with the experimental results. The limitations of this method are analyzed in terms of the molecular structure of the ionic liquids. The results of this work aim to increase our knowledge about how the molecular structure of an ionic liquid influences its material dispersion. Understanding this influence is fundamental to producing ionic liquids with tailored optical properties.
2024-01-31T08:14:11Z
2024-01-31T08:14:11Z
2024-01-31T08:14:11Z
2020-05-22
journal article
Rodríguez-Fernández, C.D., Arosa, Y., Algnamat, B., López Lago, E., Fuente, R. de la. (2020). An experimental and computational study on the material dispersion of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids, "Phys. Chem. Chem. Phys.", 22, 14061-14076
1463-9076
http://hdl.handle.net/10347/32130
10.1039/D0CP01572E
1463-9084
eng
https://doi.org/10.1039/D0CP01572E
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
Atribución-NoComercial-CompartirIgual 4.0 Internacional
Royal Society of Chemistry
oai:minerva.usc.es:10347/306402023-07-10T06:11:13Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Low-cost method for manufacturing self-adherent PDMS lenses for presbyopia
Gómez Varela, Ana Isabel
Fernández Rodríguez, Alejandro
Bao Varela, María del Carmen
Arines Piferrer, Justo
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Elastomeric lenses
PDMS
Manufacturing
Presbyopia
Aberrations
We present an easy method for manufacturing elastomeric self-adherent lenses with optical quality. The lenses were manufactured in polydimethylsiloxane using ophthalmic and trial lenses of different base curve as master molds to generate different refractive powers. The diameter of the manufactured lenses ranged between 30 mm and 60 mm. We characterized the lenses alone and after being self-adhered to different spherocylindrical ophthalmic lenses, by measuring the refractive power and the Zernike aberrations. Besides, an artificial myopic eye was used to quantify the image quality provided by the lenses self-adhered to several ophthalmic lens. The manufactured lenses showed good optical quality with no aberrations. Low order refractive errors were found in one case after self-adhesion. The results confirm the suitability and simplicity of the proposed method to manufacture high quality elastomeric lenses that can be self-adhered to ophthalmic lenses to add power and help with presbyopia
2023-06-06T08:21:48Z
2023-06-06T08:21:48Z
2023-06-06T08:21:48Z
2023
journal article
Optics & Laser Technology 163 (2023) 109445
http://hdl.handle.net/10347/30640
10.1016/j.optlastec.2023.109445
0030-3992
eng
https://doi.org/10.1016/j.optlastec.2023.109445
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115909RB-I00/ES/INGENIERIA DE LA FASE DE LA PUPILA PARA LA MEJORA DEL DIAGNOSTICO OCULAR Y DE LA CALIDAD VISUAL
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/)
Elsevier
oai:minerva.usc.es:10347/306202023-07-10T06:11:21Zcom_10347_2988com_10347_2889com_10347_227com_10347_2919com_10347_2891com_10347_2888com_10347_2927col_10347_11762col_10347_10699col_10347_12292
Uncovering the mechanisms of cyclic peptide self-assembly in membranes with the chirality-aware MA(R/S)TINI forcefield
Cabezón Vizoso, Alfonso
Calvelo Souto, Martín
Granja Guillán, Juan Ramón
Piñeiro Guillén, Ángel
García Fandiño, Rebeca
Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Orgánica
Cyclic peptides
Coarse-grained molecular dynamics simulations
Martini forcefield
Lipid bilayers
Cyclic peptides (CPs) formed by alternation of D- and L-amino acids (D,L-CPs) can self-assemble into nanotubes (SCPNs) by parallel or/and antiparallel stacking. Different applications have been attributed to these nanotubes, including the disruption of lipid bilayers of specific compositions and the selective transport of ions throughout membranes. Molecular dynamics (MD) simulations have significantly contributed to understand the interaction between CPs, including the structural, dynamic and transport properties of their supramolecular aggregates. The high computational cost of atomic resolution forcefields makes them impractical for simulating the self-assembly of macromolecules, so coarse-grained (CG) models might represent a more feasible solution for this purpose. However, general CG models used for the simulation of biomolecules such as the MARTINI forcefield do not explicitly consider the non-covalent interactions leading to the formation of secondary structure patterns in proteins. This becomes particularly important in the case of CPs due to the D- and L-chirality alternation in their sequence, leading to opposite orientations of the backbone polar groups on both sides of the cyclic ring plane. In order to overcome this limitation, we have extended the MARTINI forcefield to introduce chirality in each residue of the CPs. The new parametrization, which we have called MA(R/S)TINI, reproduces the expected self-assembly patterns for several CP sequences in the presence of different membrane models, explicitly considering the chirality of the CPs and with no significant extra computational cost. Our simulations provide new mechanistic information of how these systems self-assemble in presence of different lipid scenarios, showing that the CP-CP and CP-membrane interactions are sensitive to the peptide sequence chirality. This opens the door to design new bioactive CPs based on CG-MD simulations. A web-based tool for the automatic parameterization of new CP sequences using MA(R/S)TINI, among other functionalities, is under construction (see http://cyclopep.com)
2023-05-30T07:48:23Z
2023-05-30T07:48:23Z
2023-05-30T07:48:23Z
2023
journal article
Journal of Colloid and Interface Science 642 (2023) 84-99
http://hdl.handle.net/10347/30620
10.1016/j.jcis.2023.03.101
0021-9797
eng
https://doi.org/10.1016/j.jcis.2023.03.101
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-098795-A-I00/ES/DISEÑO DE AGENTES ANTITUMORALES A PARTIR DE SIMULACIONES DE DINAMICA MOLECULAR, ANALISIS BIG DATA E INTELIGENCIA ARTIFICIAL VALIDADOS POR EXPERIMENTOS BIOFISICOS
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-111327GB-I00/ES/DISEÑO DE NANOBOTS DE CONTROL SENCILLO BASADOS EN AUTOENSAMBLAJE MOLECULAR ESPONTANEO
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-111126RB-100/ES
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PDC2022-133402-I00/ES
http://creativecommons.org/licenses/by/4.0/
open access
© 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Elsevier
oai:minerva.usc.es:10347/262352023-11-16T09:05:11Zcom_10347_2899com_10347_2890com_10347_2888com_10347_227com_10347_20714com_10347_2889com_10347_2919com_10347_2891com_10347_2908col_10347_13398col_10347_20715col_10347_10699col_10347_15764
Exposure to 2.45 GHz Radiation Triggers Changes in HSP-70, Glucocorticoid Receptors and GFAP Biomarkers in Rat Brain
Othman, Haifa
López Furelos, Alberto
Leiro Vidal, José Manuel
Ammari, Mohamed
Sakly, Mohsen
Abdelmelek, Hafedh
Salas Sánchez, Aarón Ángel
Ares Pena, Francisco José
López Martín, María Elena
Universidade de Santiago de Compostela. Departamento de Ciencias Morfolóxicas
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Microbioloxía e Parasitoloxía
Universidade de Santiago de Compostela. Instituto Interdisciplinar de Tecnoloxías Ambientais (CRETUS)
2.45 GHz radiation
GFAP
Glucocorticoid receptor
HSP-70
Nonionizing radiation
Brain tissue may be especially sensitive to electromagnetic phenomena provoking signs of neural stress in cerebral activity. Fifty-four adult female Sprague-Dawley rats underwent ELISA and immunohistochemistry testing of four relevant anatomical areas of the cerebrum to measure biomarkers indicating induction of heat shock protein 70 (HSP-70), glucocorticoid receptors (GCR) or glial fibrillary acidic protein (GFAP) after single or repeated exposure to 2.45 GHz radiation in the experimental set-up. Neither radiation regime caused tissue heating, so thermal effects can be ruled out. A progressive decrease in GCR and HSP-70 was observed after acute or repeated irradiation in the somatosensory cortex, hypothalamus and hippocampus. In the limbic cortex; however, values for both biomarkers were significantly higher after repeated exposure to irradiation when compared to control animals. GFAP values in brain tissue after irradiation were not significantly different or were even lower than those of nonirradiated animals in all brain regions studied. Our results suggest that repeated exposure to 2.45 GHz elicited GCR/HSP-70 dysregulation in the brain, triggering a state of stress that could decrease tissue anti-inflammatory action without favoring glial proliferation and make the nervous system more vulnerable
2021-05-20T12:31:14Z
2021-05-20T12:31:14Z
2021-05-20T12:31:14Z
2021
journal article
Int. J. Mol. Sci. 2021, 22(10), 5103; https://doi.org/10.3390/ijms22105103
http://hdl.handle.net/10347/26235
10.3390/ijms22105103
1422-0067
eng
https://doi.org/10.3390/ijms22105103
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/TEC2017-86110-R/ES/DETERMINACION DEL NIVEL DE CONCENTRACION DE PARTICULAS ATMOSFERICAS CON ANTENAS: METODO DE MONITORIZACION PARA DESARROLLAR UNA ESTRATEGIA DE PROTECCION INTEGRAL DEL CIUDADANO
http://creativecommons.org/licenses/by/4.0/
open access
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/184502020-01-31T13:50:36Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Ideas for Improving Peer Review
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
2019-03-21T13:37:34Z
2019-03-21T13:37:34Z
2019-03-21T13:37:34Z
2003
journal article
Mira Pérez, J. (2003). Ideas for Improving Peer Review. Physics Today 56, 11, 11; doi: 10.1063/1.1634515.
0031-9228
http://hdl.handle.net/10347/18450
10.1063/1.1634515
eng
https://doi.org/ 10.1063/1.1634515
open access
© 2003 American Institute of Physics
AIP Publishing
oai:minerva.usc.es:10347/213432020-04-14T02:01:46Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Novel Magnetic Nanostructured Beads for Cadmium(II) Removal
Castro Alves, Lisandra de
Yáñez Vilar, Susana
Piñeiro Redondo, Yolanda
Rivas Rey, José
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Magnetic
Nanoparticles
Alginate
Beads
Adsorption
Cadmium
This study presents an effective magnetic separation method for cadmium removal,
based on the use of a novel nanostructured material as an adsorbent. This adsorbent involves
the incorporation of magnetite nanoparticles (Fe3O4-NPs), synthesized by the reverse coprecipitation
method, into sodium alginate and activated carbon to form spherical structures by crosslinking Ca2+
ions with the charged alginate chains, referred to as magnetic alginate activated carbon (MAAC) beads.
The effect of the experimental parameters, such as pH, contacting time, adsorbent dosage, agitation
type, and rotating speed were investigated and optimized for an efficient removal of Cd(II) ions at an
initial concentration of 250 mg/L. The amount of adsorbed Cd(II) by MAAC beads increased at a pH
of 6 with a removal efficiency over 90%. The maximum adsorption capacity reached was 70 mg/g of
adsorbent at an initial Cd(II) concentration of 150 mg/L, whereas at 250 mg/L the adsorption capacity
lowered until 60 mg/g. Sorption isotherms were calculated using Langmuir, Freundlich, Temkin,
and Dubinin–Radushkevich equations, and were better described by the Freundlich and Temkin
models. These results proved the removal efficiency and the potential use under real environmental
conditions of the MAAC beads, due to their easy recovery from contaminated aqueous solutions.
2020-04-13T22:14:21Z
2020-04-13T22:14:21Z
2020-04-13T22:14:21Z
2019
journal article
de Castro Alves, L.; Yáñez-Vilar, S.; Piñeiro-Redondo, Y.; Rivas, J. Novel Magnetic Nanostructured Beads for Cadmium(II) Removal. Nanomaterials 2019, 9, 356
http://hdl.handle.net/10347/21343
10.3390/nano9030356
2079-4991
eng
https://doi.org/10.3390/nano9030356
https://creativecommons.org/licenses/by/4.0/
open access
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
MDPI
oai:minerva.usc.es:10347/184242020-01-31T13:33:38Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Football: effect of increasing goal size on the number of goals
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Physics
Elastic collision
Soccer
Goal size
Física
Colisión elástica
Fútbol
Tamaño de portería
Here is an example of elastic collision to be presented in a contextual manner to a physics class. Namely, the effect of increasing goal mouth size on the number of goals scored in a football match is discussed, considering elastic collisions of the ball with the posts. The results are compared with data taken from rhe Spanish Professional League, that show a high number of shots-to-post. Surprisingly, there is a direct correlation of the increase in goal mouth area with the increase of goals
Se presenta un ejemplo de colisión elástica para ser mostrado de un modo informal en una clase de física. En particular se discute el efecto que tendría un incremento del tamaño de las porterías en el número de goles de los partidos de fútbol, tras considerar que las colisiones del balón con los postes son elásticas. Los resultados se comparan con datos obtenidos de la Liga de Fútbol Profesional de España, que muestran un número muy alto de balones al poste. Sorprendentemente, hay una correlación directa entre el incremento de área de la portería y el incremento de goles
2019-03-21T09:55:32Z
2019-03-21T09:55:32Z
2019-03-21T09:55:32Z
2005
journal article
Mira Pérez, J. (2005). Football: effect of increasing goal size on the number of goals. Revista de educación en ciencias :Journal of science education. vol. 6, n. 1, p. 49
0124-5481
http://hdl.handle.net/10347/18424
eng
open access
© Fundación Revista de Educación de las Ciencias, 2005
Fundación Revista de Educación de las Ciencias
oai:minerva.usc.es:10347/262102021-05-20T02:04:51Zcom_10347_20714com_10347_2889com_10347_227com_10347_2918com_10347_2891com_10347_2888com_10347_2919com_10347_2921com_10347_2984col_10347_20715col_10347_13951col_10347_10699col_10347_15784col_10347_26208
Optimal control of the COVID-19 pandemic: controlled sanitary deconfinement in Portugal
Silva, Cristiana
Cruz, Carla
Torres, Delfim F. M.
Pérez Muñuzuri, Alberto
Carballosa Calleja, Alejandro
Area Carracedo, Iván Carlos
Nieto Roig, Juan José
Fonseca-Pinto, Rui
Passadouro da Fonseca, Rui
Soares dos Santos, Estevão
Abreu, Wilson
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Universidade de Santiago de Compostela. Instituto Interdisciplinar de Tecnoloxías Ambientais (CRETUS)
Universidade de Santiago de Compostela. Departamento de Estatística, Análise Matemática e Optimización
Universidade de Santiago de Compostela. Instituto de Matemáticas
Applied mathematics
Control theory
Differential equations
Dynamic networks
Dynamical systems
Infectious diseases
Population dynamics
The COVID-19 pandemic has forced policy makers to decree urgent confinements to stop a rapid and massive contagion. However, after that stage, societies are being forced to find an equilibrium between the need to reduce contagion rates and the need to reopen their economies. The experience hitherto lived has provided data on the evolution of the pandemic, in particular the population dynamics as a result of the public health measures enacted. This allows the formulation of forecasting mathematical models to anticipate the consequences of political decisions. Here we propose a model to do so and apply it to the case of Portugal. With a mathematical deterministic model, described by a system of ordinary differential equations, we fit the real evolution of COVID-19 in this country. After identification of the population readiness to follow social restrictions, by analyzing the social media, we incorporate this effect in a version of the model that allow us to check different scenarios. This is realized by considering a Monte Carlo discrete version of the previous model coupled via a complex network. Then, we apply optimal control theory to maximize the number of people returning to “normal life” and minimizing the number of active infected individuals with minimal economical costs while warranting a low level of hospitalizations. This work allows testing various scenarios of pandemic management (closure of sectors of the economy, partial/total compliance with protection measures by citizens, number of beds in intensive care units, etc.), ensuring the responsiveness of the health system, thus being a public health decision support tool
2021-05-19T07:40:37Z
2021-05-19T07:40:37Z
2021-05-19T07:40:37Z
2021
journal article
Silva, C.J., Cruz, C., Torres, D.F.M. et al. Optimal control of the COVID-19 pandemic: controlled sanitary deconfinement in Portugal. Sci Rep 11, 3451 (2021). https://doi.org/10.1038/s41598-021-83075-6
2045-2322
http://hdl.handle.net/10347/26210
10.1038/s41598-021-83075-6
eng
https://doi.org/10.1038/s41598-021-83075-6
http://creativecommons.org/licenses/by/4.0/
open access
© The Author(s) 2021. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
Atribución 4.0 Internacional
Springer Nature
oai:minerva.usc.es:10347/325652024-02-09T01:03:14Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Epithelial and stromal thickness profile and lens decentration in myopic orthokeratology
González Pérez, Javier
Sánchez García, Ángel
Parafita, Manuel Angel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Anterior segment optical coherence tomography
Corneal refractive therapy
Corneal thickness
Epithelial thickness
Stromal thickness
Lens decentration
Orthokeratology
Purpose
To study topographic epithelial and total corneal thickness changes in myopic subjects undergoing successful orthokeratology treatment in connection with the objective assessment of contact lens decentration.
Methods
A prospective-observational and non-randomized study in 32 Caucasian myopic eyes undergoing Ortho-k for 3 months. Total, epithelial, and stromal thicknesses were studied before and after Ortho-k treatment, using optical coherence tomography with anterior segment application software. Central, paracentral, and mid-peripheral values are taken along 8 semi-meridians.
2024-02-08T09:06:59Z
2024-02-08T09:06:59Z
2024-02-08T09:06:59Z
2023-10-29
journal article
J. González-Pérez, A. Sánchez-García, M.A. Parafita, Epithelial and stromal thickness profile and lens decentration in myopic orthokeratology, Journal of Optometry, Volume 17, Issue 2, 2024, 100485, ISSN 1888-4296, https://doi.org/10.1016/j.optom.2023.100485.
1888-4296
http://hdl.handle.net/10347/32565
10.1016/j.optom.2023.100485
1989-1342
eng
https://doi.org/10.1016/j.optom.2023.100485
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Elsevier
oai:minerva.usc.es:10347/324272024-02-07T01:03:35Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Sample size bias in the empirical assessment of the acute risks associated with daylight saving time transitions
Martín Olalla, José María
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
DST
Summer time
Latitude
Sleep derivation
Spring transition
Europe
Insolation
Season
Motor vehicle accidents
The assessment of the acute impact of daylight saving time (DST) transitions is a question of great interest for an understanding of the benefits and inconveniences of a practice that is now under public scrutiny in Europe and America. Here, we report a thorough analysis of a record of 13 well-known research studies that reported increased risks associated with DST transitions in health issues – acute myocardial infarction, ischemic strokes and trauma admissions – and in societal issues – accidents, traffic accidents and fatal motor vehicle accidents. We found that a five percent increase of the risks suffices to understand the reported increased risks associated with the spring transition. Reported values above this threshold are impacted by the sample size of the study. In the case of the autumn transition, no increase in the risks is found.
2024-02-06T12:25:57Z
2024-02-06T12:25:57Z
2024-02-06T12:25:57Z
2023-01-03
journal article
Martín Olalla, J.M. y Mira, J. (2023). Sample size bias in the empirical assessment of the acute risks associated with daylight saving time transitions. Chronobiology International, 40 (2), 186-191. https://doi.org/10.1080/07420528.2022.2157738
http://hdl.handle.net/10347/32427
10.1080/07420528.2022.2157738
eng
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Taylor and Francis
oai:minerva.usc.es:10347/328022024-02-15T13:52:19Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Analysis of the relationship of the central tear meniscus area with the tear film symptomatology and stability
García Resúa, Carlos
Pena Verdeal, Hugo
García Queiruga, Jacobo
Calo Santiago, Rosa
Giráldez Fernández, María Jesús
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Purpose: Tear film meniscus evaluation offers a non-invasive indication of the total volume of the tear. This study aimed to analyse the relationship between the central tear meniscus area with symptomatology and tear film stability. Material and methods: 120 participants who completed an OSDI questionnaire were enrolled in the study. After fluorescein installation, two videos were recorded by a digital camera attached to a slit-lamp. The first video recorded the lower central portion of the tear meniscus (6 o'clock) with a short light beam (3x5mm), and the second one recorded the complete ocular surface obtaining the Break-Up time (BUT) and Maximum Blink Interval (MBI). A self-design program (FWCapture) was used to acquire the videos while the participants were requested to keep the eye open for as long as possible three times. Images were extracted from each video by a masked observer. From de first video, the Central Tear Meniscus Area with fluorescein (CTMAF) was "manually" measured by using ImageJ software (command "<<freehand tool"). From the second video, BUT and MBI were determined by counting video frames and then converting in seconds; both parameters were averaged using only the two most similar measurements. Results: CTMAF showed a negative correlation with OSDI score (Spearman Rho: p <0.001, r=-0.372). There was a statistical difference in the CTMAF between OSDI subgroups (Kruskal-Wallis: p=0.001). CTMAF showed a positive correlation with BUT/MBI (Spearman Rho: both p <=0.003, r>=0.246). Conclusions: Tear film volume showed a relationship with the symptomatology and tear film stability.
2024-02-12T13:24:33Z
2024-02-12T13:24:33Z
2024-02-12T13:24:33Z
2019
journal article
Carlos Garcia-Resua, Hugo Pena-Verdeal, Jacobo Garcia-Queiruga, Rosa Calo-Santiago, and Maria J. Giraldez "Analysis of the relationship of the central tear meniscus area with the tear film symptomatology and stability", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071A (3 October 2019)
http://hdl.handle.net/10347/32802
10.1117/12.2527348
eng
open access
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).
SPIE
oai:minerva.usc.es:10347/228702023-07-10T06:11:54Zcom_10347_2899com_10347_2890com_10347_2888com_10347_227com_10347_2919com_10347_2891col_10347_13398col_10347_10699
Intraarterial route increases the risk of cerebral lesions after mesenchymal cell administration in animal model of ischemia
Argibay González, Bárbara
Trekker, Jesse
Himmelreich, Uwe
Beiras Iglesias, Andrés
Topete Camacho, Antonio
Taboada Antelo, Pablo
Pérez Mato, María
Vieites Prado, Alba
Iglesias Rey, Ramón
Rivas Rey, José
Planas, Anna M.
Sobrino Moreiras, Tomás
Castillo Sánchez, José Antonio
Campos Pérez, Francisco
Universidade de Santiago de Compostela. Departamento de Ciencias Morfolóxicas
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Mesenchymal stem cells (MSCs) are a promising clinical therapy for ischemic stroke. However, critical parameters, such as the most effective administration route, remain unclear. Intravenous (i.v.) and intraarterial (i.a.) delivery routes have yielded varied outcomes across studies, potentially due to the unknown MSCs distribution. We investigated whether MSCs reached the brain following i.a. or i.v. administration after transient cerebral ischemia in rats, and evaluated the therapeutic effects of both routes. MSCs were labeled with dextran-coated superparamagnetic nanoparticles for magnetic resonance imaging (MRI) cell tracking, transmission electron microscopy and immunohistological analysis. MSCs were found in the brain following i.a. but not i.v. administration. However, the i.a. route increased the risk of cerebral lesions and did not improve functional recovery. The i.v. delivery is safe but MCS do not reach the brain tissue, implying that treatment benefits observed for this route are not attributable to brain MCS engrafting after stroke.
2020-06-06T17:30:20Z
2020-06-06T17:30:20Z
2020-06-06T17:30:20Z
2017
journal article
Argibay, B., Trekker, J., Himmelreich, U. et al. Intraarterial route increases the risk of cerebral lesions after mesenchymal cell administration in animal model of ischemia. Sci Rep 7, 40758 (2017). https://doi.org/10.1038/srep40758
2045-2322
http://hdl.handle.net/10347/22870
10.1038/srep40758
eng
https://doi.org/10.1038/srep40758
info:eu-repo/grantAgreement/EC/H2020/686009
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-40971-R/ES/DISPOSITIVOS PARA IMAGEN Y TERAPIA MULTIMODAL BASADOS EN NANOFOSFOROS SOBRECONVERSORES
http://creativecommons.org/licenses/by/4.0/
open access
© The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Nature Publishing Group
oai:minerva.usc.es:10347/218002020-04-28T02:01:21Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Imaging properties of the light sword optical element used as a contact lens in a presbyopic eye model
Petelczyc, K.
Bará Viñas, Salvador Xurxo
Ciro López, A.
Jaroszewicz, Z.
Kakarenko, K.
Kolodziejczyk, A.
Sypek, M.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Geometric optical design
Image formation theory
Lens system design
Vision modeling
Visual optics
Aging changes
The paper analyzes the imaging properties of the light sword optical element (LSOE) applied as a contact lens to the presbyopic human eye. We performed our studies with a human eye model based on the Gullstrand parameterization. In order to quantify the discussion concerning imaging with extended depth of focus, we introduced quantitative parameters characterizing output images of optotypes obtained in numerical simulations. The quality of the images formed by the LSOE were compared with those created by a presbyopic human eye, reading glasses and a quartic inverse axicon. Then we complemented the numerical results by an experiment where a 3D scene was imaged by means of the refractive LSOE correcting an artificial eye based on the Gullstrand model. According to performed simulations and experiments the LSOE exhibits abilities for presbyopia correction in a wide range of functional vision distances.
2020-04-27T13:55:54Z
2020-04-27T13:55:54Z
2020-04-27T13:55:54Z
2011
journal article
K. Petelczyc, S. Bará, A. Ciro Lopez, Z. Jaroszewicz, K. Kakarenko, A. Kolodziejczyk, and M. Sypek, "Imaging properties of the light sword optical element used as a contact lens in a presbyopic eye model," Opt. Express 19, 25602-25616 (2011)
http://hdl.handle.net/10347/21800
10.1364/OE.19.025602
1094-4087
eng
https://doi.org/10.1364/OE.19.025602
https://creativecommons.org/licenses/by/4.0/
open access
© 2011 Optical Society of America. This article is under a Creative Commons Attribution 4.0 International License (CC BY 4.0)
OSA Publishing
oai:minerva.usc.es:10347/184062020-01-31T14:31:48Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
A simple solvothermal synthesis of MFe2O4 (M=Mn, Co and Ni) nanoparticles
Yáñez Vilar, Susana
Sánchez Andújar, Manuel
Gómez Aguirre, Lilián Claudia
Mira Pérez, Jorge
Señarís Rodríguez, María Antonia
Castro García, Socorro
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Ferrite
Nanoparticle
Solvothermal synthesis
Magnetic particles
Nanoparticles of MFe2O4 (M=Mn, Co and Ni), with diameters ranging from 5 to 10 nm, have been obtained through a solvothermal method. In this synthesis, an alcohol (benzyl alcohol or hexanol) is used as both a solvent and a ligand; it is not necessary, therefore, to add a surfactant, simplifying the preparation of the dispersed particles. We have studied the influence of the synthetic conditions (temperature, time of synthesis and nature of solvent) on the quality of the obtained ferrites and on their particle size. In this last aspect, we have to highlight that the solvent plays an important role on the particle size, obtaining the smallest diameters when hexanol was used as a solvent. In addition, the magnetic properties of the obtained compounds have been studied at room temperature (RT). These compounds show a superparamagnetic behaviour, as was expected for single domain nanoparticles, and good magnetization values. The maxima magnetization values of the MFe2O4 samples are quite high for such small nanoparticles; this is closely related to the high crystallinity of the particles obtained by the solvothermal method
2019-03-18T12:49:03Z
2019-03-18T12:49:03Z
2019-03-18T12:49:03Z
2009
journal article
Yáñez-Vilar, S., Sánchez-Andújar, M., Gómez-Aguirre, C., Mira, J., Señarís-Rodríguez, M., & Castro-García, S. (2009). A simple solvothermal synthesis of MFe2O4 (M=Mn, Co and Ni) nanoparticles. Journal Of Solid State Chemistry, 182(10), 2685-2690. doi: 10.1016/j.jssc.2009.07.028
0022-4596
http://hdl.handle.net/10347/18406
10.1016/j.jssc.2009.07.028
eng
https://doi.org/10.1016/j.jssc.2009.07.028
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© Elsevier 2009. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (https://creativecommons.org/licenses/by-nc-nd/4.0/)
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/299052023-07-10T06:11:10Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Tribological enhancement of potential electric vehicle lubricants using coated TiO2 nanoparticles as additives
Liñeira del Río, José Manuel
Mariño Fernández, Fátima
López Iglesias, Enriqueta
Gonçalves, David E. P.
Seabra, Jorge H. O.
Fernández Pérez, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Low-viscosity lubricants
Transmission fluids
Nanoparticles coating
Friction
Wear
This work presents the antifriction and antiwear properties of TiO2 nanoparticles coated with oleic acid, TiO2-OA, as additives of a low viscosity polyalphaolefin base oil, PAO8. To find the optimal concentration of nanoadditives that minimize friction and wear, four PAO8 based nanodispersions were formulated: PAO8 + 0.10 wt% TiO2-OA, PAO8 + 0.25 wt% TiO2-OA, PAO8 + 0.35 wt% TiO2-OA and PAO8 + 0.50 wt% TiO2-OA. Tribological experiments were performed under pure sliding and rolling-sliding conditions at 120 °C, with the four formulated nanolubricants and with PAO8 base oil. All the nanolubricants showed lower friction coefficients than that obtained with the PAO8 base oil, reaching maximum reductions for the 0.35 wt% TiO2-OA nanolubricant, for both types of test conditions. The tribological specimens tested under pure sliding conditions with the nanolubricants showed fewer wear than those tested with PAO8, finding the highest wear decreases also with the PAO8 + 0.35 wt% TiO2-OA nanolubricant, being 26 %, 65 % and 73 %, in wear track width, depth and area, in that order. Through Raman microscopy and roughness study of the worn samples, it can be inferred that tribofilm, mending and polishing mechanisms occur. Moreover, the thermal conductivity of the optimal nanolubricant (0.35 wt%) was measured at 20, 30, 40 and 50 °C
2023-01-17T13:35:58Z
2023-01-17T13:35:58Z
2023-01-17T13:35:58Z
2022
journal article
Journal of Molecular Liquids 371 (2023) 121097
http://hdl.handle.net/10347/29905
10.1016/j.molliq.2022.121097
0167-7322
eng
https://doi.org/10.1016/j.molliq.2022.121097
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112846RB-C22/ES/NANOMATERIALES PARA VEHICULOS ELECTRICOS: FLUIDOS DE TRANSMISION Y RECUBRIMIENTOS
http://creativecommons.org/licenses/by/4.0/
open access
Ó 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/267472023-07-10T06:11:42Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2921com_10347_2904com_10347_2890col_10347_10699col_10347_15784col_10347_12265
Hybrid Methacrylated Gelatin and Hyaluronic Acid Hydrogel Scaffolds. Preparation and Systematic Characterization for Prospective Tissue Engineering Applications
Velasco Rodríguez, Brenda
Diaz Vidal, Tania
Rosales Rivera, Luis Carlos
García González, Carlos Alberto
Álvarez Lorenzo, Carmen Isabel
Al-Modlej, Abeer
Domínguez Arca, Vicente
Prieto Estévez, Gerardo
Barbosa Fernández, Silvia
Soltero Martinez, José Félix Armando
Taboada Antelo, Pablo
Universidade de Santiago de Compostela. Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Gelatin
Hyaluronic acid
Hydrogel
Hybrid scaffolds
Tissue engineering
Porosity
Hyaluronic acid (HA) and gelatin (Gel) are major components of the extracellular matrix of different tissues, and thus are largely appealing for the construction of hybrid hydrogels to combine the favorable characteristics of each biopolymer, such as the gel adhesiveness of Gel and the better mechanical strength of HA, respectively. However, despite previous studies conducted so far, the relationship between composition and scaffold structure and physico-chemical properties has not been completely and systematically established. In this work, pure and hybrid hydrogels of methacroyl-modified HA (HAMA) and Gel (GelMA) were prepared by UV photopolymerization and an extensive characterization was done to elucidate such correlations. Methacrylation degrees of ca. 40% and 11% for GelMA and HAMA, respectively, were obtained, which allows to improve the hydrogels’ mechanical properties. Hybrid GelMA/HAMA hydrogels were stiffer, with elastic modulus up to ca. 30 kPa, and porous (up to 91%) compared with pure GelMA ones at similar GelMA concentrations thanks to the interaction between HAMA and GelMA chains in the polymeric matrix. The progressive presence of HAMA gave rise to scaffolds with more disorganized, stiffer, and less porous structures owing to the net increase of mass in the hydrogel compositions. HAMA also made hybrid hydrogels more swellable and resistant to collagenase biodegradation. Hence, the suitable choice of polymeric composition allows to regulate the hydrogels´ physical properties to look for the most optimal characteristics required for the intended tissue engineering application
2021-08-10T12:43:26Z
2021-08-10T12:43:26Z
2021-08-10T12:43:26Z
2021
journal article
Int. J. Mol. Sci. 2021, 22(13), 6758; https://doi.org/10.3390/ijms22136758
http://hdl.handle.net/10347/26747
10.3390/ijms22136758
1422-0067
eng
https://doi.org/10.3390/ijms22136758
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-80266-R/ES
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-109517RB-I00/ES/NUEVOS NANOTRANSPORTADORES BIOMIMETICOS YPLATAFORMAS IN VITRO PARA LA VALIDACION EXITOSA DE LA TERAGNOSTICA PARA LA ATEROSCLEROSIS
http://creativecommons.org/licenses/by/4.0/
open access
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/236332022-03-16T12:48:16Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Soft Actuated Hybrid Hydrogel with Bioinspired Complexity to Control Mechanical Flexure Behavior for Tissue Engineering
Rial Silva, Ramón
Liu, Zhen
Ruso Beiras, Juan Manuel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Hydrogels
Scaffolds
Bionanoparticles
Tissue engineering
Mechanical properties
Hydrogels exhibit excellent properties that enable them as nanostructured scaffolds for soft tissue engineering. However, single-component hydrogels have significant limitations due to the low versatility of the single component. To achieve this goal, we have designed and characterized different multi-component hydrogels composed of gelatin, alginate, hydroxyapatite, and a protein (BSA and fibrinogen). First, we describe the surface morphology of the samples and the main characteristics of the physiological interplay by using fourier transform infrared (FT-IR), and confocal Raman microscopy. Then, their degradation and swelling were studied and mechanical properties were determined by rheology measurements. Experimental data were carefully collected and quantitatively analyzed by developing specific approaches and different theoretical models to determining the most important parameters. Finally, we determine how the nanoscale of the system influences its macroscopic properties and characterize the extent to which degree each component maintains its own functionality, demonstrating that with the optimal components, in the right proportion, multifunctional hydrogels can be developed
2020-11-10T11:07:39Z
2020-11-10T11:07:39Z
2020-11-10T11:07:39Z
2020
journal article
Rial, R.; Liu, Z.; Ruso, J.M. Soft Actuated Hybrid Hydrogel with Bioinspired Complexity to Control Mechanical Flexure Behavior for Tissue Engineering. Nanomaterials 2020, 10, 1302
http://hdl.handle.net/10347/23633
10.3390/nano10071302
2079-4991
eng
https://doi.org/10.3390/nano10071302
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/311712024-02-23T12:17:10Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2956com_10347_2893col_10347_10699col_10347_9747
Elemental composition of raw and torrefied pellets made from pine and pine-eucalyptus blends
Iglesias Canabal, Andrés
Proupín Castiñeiras, Jorge
Rodríguez Añón, José Antonio
Eimil Fraga, Cristina
Rodríguez Soalleiro, Roque
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Produción Vexetal e Proxectos de Enxeñaría
Pellets
Chlorine
Alkali index
Elemental composition
Debarked Pinus radiata wood was blended with debarked Eucalyptus nitens wood in three different proportions: 100% pine (100P), 90% pine-10% eucalyptus (90P/10E) and 60% pine-40% eucalyptus (60P/40E). The pellets were torrefied in dry and non-oxidative conditions at different temperatures (210, 240, 270 and 300 °C) and residence times (40 and 60 min) to enhance the energy properties and determine the elemental composition (18 elements). For raw pellets, the concentrations of Na, K, Zn, B and Cl increased significantly with the proportion of eucalyptus wood, with Cl levels being 60% higher in the 60P/40E than in the 100P pellets. The concentrations of most elements (C, Mg, Al, P, Ca, Fe, Cu) tended to increase (+35% for C, +200–250% for the others) with torrefaction severity, independently of the mixture. Decreases in H and O concentrations were also independent of the mixture. Torrefaction decreased the Cl content by 63–77%, which compensated for the high levels in mixtures with eucalyptus. Increases in the high heating value (by as much as 37%) with torrefaction occurred in parallel with an increase in carbon content and a decrease in the atomic H:C and O:C ratios, particularly in the 260 to 300 °C transition. Torrefaction compensated for the negative effect of the inclusion of eucalyptus, with the alkali index remaining at a relatively safe maximum value of 0.10 kg GJ−1
2023-11-06T13:22:41Z
2023-11-06T13:22:41Z
2023-11-06T13:22:41Z
2023-09-01
journal article
Biomass and Bioenergy 177 (2023) 106951
0961-9534
http://hdl.handle.net/10347/31171
10.1016/j.biombioe.2023.106951
eng
https://doi.org/10.1016/j.biombioe.2023.106951
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2023 The Authors. Published by Elsevier Ltd. This article is available under the Creative Commons CC-BY-NC-ND license and permits non-commercial use of the work as published, without adaptation or alteration provided the work is fully attributed
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/271302023-07-10T06:10:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Double hybrid lubricant additives consisting of a phosphonium ionic liquid and graphene nanoplatelets/hexagonal boron nitride nanoparticles
Nasser, Khodor I.
Liñeira del Río, José Manuel
Mariño Fernández, Fátima
López, Enriqueta R.
Fernández Pérez, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Lubricant additive
Nanomaterials
Ionic liquids
Hybrid additives
Tribological performance of polyalphaolefin 32, PAO, is investigated by adding two nanomaterials (graphene nanoplatelets, GnP, and hexagonal boron nitride nanoparticles, h-BN) and an ionic liquid ([P6,6,6,14][DEHP], IL1, [P2,4,4,4][DEP], IL2, or [P6,6,6,14][(iC8)2PO2], IL3). Designed double hybrid nanodispersions are PAO/1 wt% ILX/0.05 wt% GnP/0.1 wt% h-BN (X = 1, 2 or 3). The best anti-friction behavior corresponds to PAO/IL3/GnP/h-BN (40% reduction compared to that achieved with PAO). Anti-wear behavior is similar for the three double hybrid nanodispersions. Roughness of the worn surface tested with PAO is higher than that obtained for each of the nanodispersions. Tribo-film formation and repair effect on worn surfaces due to ILs and nanoparticles are revealed. Some positive synergies were found between each IL and GnP/h-BN as hybrid PAO additive
2021-11-23T13:40:46Z
2021-11-23T13:40:46Z
2021-11-23T13:40:46Z
2021
journal article
Tribology International 163 (2021) 107189
0301-679X
http://hdl.handle.net/10347/27130
10.1016/j.triboint.2021.107189
eng
https://doi.org/10.1016/j.triboint.2021.107189
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-86425-C2-2-R/ES/LUBRICANTES BASADOS EN NANOADITIVOS AVANZADOS PARA ENGRANAJES Y MOTORES
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/213412023-07-10T06:18:13Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Evaluating Human Photoreceptoral Inputs from Night-Time Lights Using RGB Imaging Photometry
Sánchez de Miguel, Alejandro
Bará Viñas, Salvador Xurxo
Aubé, Martín
Cardiel, Nicolás
Tapia, Carlos E.
Zamorano, Jaime
Gaston, Kevin J.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Light pollution
Imaging
Artificial light at night
Night-time lights
DSLR cameras
RGB sensors
Non-visual effects of light
Circadian phototransduction
Night-time lights interact with human physiology through different pathways starting
at the retinal layers of the eye; from the signals provided by the rods; the S-, L- and M-cones; and
the intrinsically photosensitive retinal ganglion cells (ipRGC). These individual photic channels
combine in complex ways to modulate important physiological processes, among them the daily
entrainment of the neural master oscillator that regulates circadian rhythms. Evaluating the relative
excitation of each type of photoreceptor generally requires full knowledge of the spectral power
distribution of the incoming light, information that is not easily available in many practical applications.
One such instance is wide area sensing of public outdoor lighting; present-day radiometers onboard
Earth-orbiting platforms with sufficient nighttime sensitivity are generally panchromatic and lack the
required spectral discrimination capacity. In this paper, we show that RGB imagery acquired with
off-the-shelf digital single-lens reflex cameras (DSLR) can be a useful tool to evaluate, with reasonable
accuracy and high angular resolution, the photoreceptoral inputs associated with a wide range of
lamp technologies. The method is based on linear regressions of these inputs against optimum
combinations of the associated R, G, and B signals, built for a large set of artificial light sources by
means of synthetic photometry. Given the widespread use of RGB imaging devices, this approach is
expected to facilitate the monitoring of the physiological effects of light pollution, from ground and
space alike, using standard imaging technology.
2020-04-13T21:59:15Z
2020-04-13T21:59:15Z
2020-04-13T21:59:15Z
2019
journal article
Sánchez de Miguel, A.; Bará, S.; Aubé, M.; Cardiel, N.; Tapia, C.E.; Zamorano, J.; Gaston, K.J. Evaluating Human Photoreceptoral Inputs from Night-Time Lights Using RGB Imaging Photometry. J. Imaging 2019, 5, 49
http://hdl.handle.net/10347/21341
10.3390/jimaging5040049
2313-433X
eng
https://doi.org/10.3390/jimaging5040049
info:eu-repo/grantAgreement/EC/H2020/824603
info:eu-repo/grantAgreement/EC/H2020/689443
info:eu-repo/grantAgreement/MICINN/Plan Nacional de I+D+i 2008-2011/AYA2011-15808-E/ES/RED ESPAÑOLA DE ESTUDIOS SOBRE LA CONTAMINACION LUMINICA
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016–75808–R/ES
https://creativecommons.org/licenses/by/4.0/
open access
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
MDPI
oai:minerva.usc.es:10347/213442020-04-14T02:01:41Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Experimental Convection Heat Transfer Analysis of a Nano-Enhanced Industrial Coolant
Álvarez Regueiro, Eva
Vallejo, Javier P.
Fernández Seara, José
Fernández Pérez, Josefa
Lugo, Luis
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Nanofluids
Functionalized graphene nanoplatelets
Commercial coolant
Energy efficiency
Wind energy
Convection heat transfer coefficient
Pressure drop
Convection heat transfer coefficients and pressure drops of four functionalized graphene
nanoplatelet nanofluids based on the commercial coolant Havoline® XLC Pre-mixed 50/50
were experimentally determined to assess its thermal performance. The potential heat transfer
enhancement produced by nanofluids could play an important role in increasing the efficiency
of cooling systems. Particularly in wind power, the increasing size of the wind turbines, up to
10 MW nowadays, requires sophisticated liquid cooling systems to keep the nominal temperature
conditions and protect the components from temperature degradation and hazardous environment
in off-shore wind parks. The effect of nanoadditive loading, temperature and Reynolds number in
convection heat transfer coefficients and pressure drops is discussed. A dimensionless analysis of the
results is carried out and empirical correlations for the Nusselt number and Darcy friction factor are
proposed. A maximum enhancement in the convection heat transfer coefficient of 7% was found for
the nanofluid with nanoadditive loading of 0.25 wt %. Contrarily, no enhancement was found for the
nanofluids of higher functionalized graphene nanoplatelet mass fraction.
2020-04-13T22:21:41Z
2020-04-13T22:21:41Z
2020-04-13T22:21:41Z
2019
journal article
Álvarez-Regueiro, E.; Vallejo, J.P.; Fernández-Seara, J.; Fernández, J.; Lugo, L. Experimental Convection Heat Transfer Analysis of a Nano-Enhanced Industrial Coolant. Nanomaterials 2019, 9, 267
http://hdl.handle.net/10347/21344
10.3390/nano9020267
2079-4991
eng
https://doi.org/10.3390/nano9020267
https://creativecommons.org/licenses/by/4.0/
open access
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
MDPI
oai:minerva.usc.es:10347/227992023-07-10T06:12:53Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Phase matching effects in high harmonic generation at the nanometer scale
Blanco Fraga, Manuel
Hernández García, C.
Chacón, A.
Lewenstein, M.
Flores Arias, María Teresa
Plaja, L.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Plasmon resonances are known to amplify the electromagnetic fields near metallic
nanostructures, providing a promising scheme to generate extreme-ultraviolet harmonics using
low power drivings. During high-order harmonic generation (HHG), the driving and harmonic
fields accumulate a phase di erence as they propagate through the target. In a typical set-up
–a laser focused into a gas jet– the propagation distances amount to several wavelengths, and
the cumulative phase-mismatch a ects strongly the e ciency and properties of the harmonic
emission. In contrast, HHG in metallic nanostructures is considered to overcome these limitations,
as the common sources of phase mismatch –optical density and focusing geometry– are negligible
for subwavelength propagation distances. We demonstrate that phase matching still plays a
relevant role in HHG from nanostructures due to the non-perturbative character of HHG, that
links the harmonic phase to the intensity distribution of the driving field. Our computations show
that widely used applications of phase matching control, such as quantum path selection and the
increase of contrast in attosecond pulse generation, are also feasible at the nanoscale.
2020-06-05T18:45:14Z
2020-06-05T18:45:14Z
2020-06-05T18:45:14Z
2017
journal article
M. Blanco, C. Hernández-García, A. Chacón, M. Lewenstein, M. T. Flores-Arias, and L. Plaja, "Phase matching effects in high harmonic generation at the nanometer scale," Opt. Express 25, 14974-14985 (2017)
http://hdl.handle.net/10347/22799
10.1364/OE.25.014974
1094-4087
eng
https://doi.org/10.1364/OE.25.014974
info:eu-repo/grantAgreement/EC/FP7/328334
open access
© 2017 Optical Society of America. Open Access. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
Optical Society of America
oai:minerva.usc.es:10347/167452020-04-08T14:15:22Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Correlation between tear osmolarity and tear meniscus
García Resúa, Carlos
Pena Verdeal, Hugo
Remeseiro, Beatriz
Giráldez Fernández, María Jesús
Yebra-Pimentel Vilar, Eva
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Osmolarity
Tear meniscus
TearLab Osmometer
ImageJ Software
Purpose. To examine the relationship between tear meniscus height (TMH) and
subjective meniscus grading (subjective TM) with tear osmolarity.
Methods. Tear osmolarity measurements (using TearLab) and digital images of the
tear meniscus were obtained in 177 consecutive patients undergoing an eye
examination at our optometry clinic (Universidad de Santiago de Compostela, Spain)
who fulfilled the study's inclusion criteria. Participants were also administered the
McMonnies and Ocular Surface Disease Index (OSDI) questionnaires for the detection
of dry eye disease.
The lower tear meniscus was videotaped by a digital camera attached to a slit lamp in
its central portion without fluorescein instillation. After the study, a masked observer
extracted an image from each video, and measured the TMH using open source
software (NIH ImageJ). Subsequently, the masked observer subjectively graded the
appearance of each meniscus. For statistical analysis, subjects were stratified by age
and by dry eye symptoms as indicated by their scores in the two questionnaires.
Results. In the whole study population, a significant relationship was observed
between osmolarity and TMH (-0.41, p<0.001) and osmolarity and subjective TM (r =
0.35, p<0.001). A cluster analysis revealed similar correlations when subjects were
stratified by age or dry eye symptoms, these correlations being more pronounced in
older and more symptomatic individuals. Objective TMH measurements and subjective
meniscus quality were also correlated (r=-0.75, p<0.001).
Conclusions. Osmolarity and both objective TMH measurements and subjective
interpretation of the meniscus showed high correlation, especially in older symptomatic
subjects.
2018-05-31T11:26:28Z
2018-05-31T11:26:28Z
2018-05-31T11:26:28Z
2014-07-02
journal article
García-Resúa C, Pena-Verdeal H, Remeseiro B, Giráldez MJ, Yebra-Pimentel E. Correlation between tear osmolarity and tear meniscus. Optom Vis Sci. 2014;91:1419-29
1040-5488
http://hdl.handle.net/10347/16745
1538-9235
eng
https://doi.org/10.1097/OPX.0000000000000412
open access
© 2018 American Academy of Optometry
Wolters Kluwer
oai:minerva.usc.es:10347/120202022-03-16T12:46:53Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Self-Assembly Drugs : from Micelles to Nanomedicine
Messina, Paula V.
Besada Porto, José Miguel
Ruso Beiras, Juan Manuel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
QSAR
Colloids
En este trabajo, se presenta un panorama general de los avances en el campo del autoensamblado molecular, discutiéndose en detalle tanto las propiedades físicas del proceso de autoensamblado como sus aplicaciones más relevantes
2017-08-29T01:00:15Z
2017-08-29T01:00:15Z
2017-08-29T01:00:15Z
2014-03
journal article
Messina, P.V.; Besada-Porto, J.M.; Ruso, J.M. Current Topics in Medicinal Chemistry, 2014, 14, 555-571
http://hdl.handle.net/10347/12020
10.2174/1568026614666140121112118
eng
http://dx.doi.org/10.2174/1568026614666140121112118
open access
© Bentham Science
Bentham Science
oai:minerva.usc.es:10347/212612023-07-10T06:17:39Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Learning from nature to improve the heat generation of iron-oxide nanoparticles for magnetic hyperthermia applications
Martínez Boubeta, Carlos
Simeonidis, Konstantinos
Makridis, Antonios
Angelakeris, Makis
Iglesias, Óscar
Guardia, Pablo
Cabot, Andreu
Yedra, Lluis
Estradé, Sonia
Peiró, Francesca
Saghi, Zineb
Midgley, Paul A.
Conde Leborán, Iván
Serantes Abalo, David
Baldomir Fernández, Daniel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Nanotechnology in cancer
Nanoparticles
Cancer therapy
Magnetic properties and materials
The performance of magnetic nanoparticles is intimately entwined with their structure, mean size and magnetic anisotropy. Besides, ensembles offer a unique way of engineering the magnetic response by modifying the strength of the dipolar interactions between particles. Here we report on an experimental and theoretical analysis of magnetic hyperthermia, a rapidly developing technique in medical research and oncology. Experimentally, we demonstrate that single-domain cubic iron oxide particles resembling bacterial magnetosomes have superior magnetic heating efficiency compared to spherical particles of similar sizes. Monte Carlo simulations at the atomic level corroborate the larger anisotropy of the cubic particles in comparison with the spherical ones, thus evidencing the beneficial role of surface anisotropy in the improved heating power. Moreover we establish a quantitative link between the particle assembling, the interactions and the heating properties. This knowledge opens new perspectives for improved hyperthermia, an alternative to conventional cancer therapies
2020-04-08T14:23:21Z
2020-04-08T14:23:21Z
2020-04-08T14:23:21Z
2013
journal article
Martinez-Boubeta, C., Simeonidis, K., Makridis, A. et al. Learning from Nature to Improve the Heat Generation of Iron-Oxide Nanoparticles for Magnetic Hyperthermia Applications. Sci Rep 3, 1652 (2013). https://doi.org/10.1038/srep01652
http://hdl.handle.net/10347/21261
10.1038/srep01652
2045-2322
eng
https://doi.org/10.1038/srep01652
info:eu-repo/grantAgreement/MICINN/Plan Nacional de I+D+i 2008-2011/MAT2009-08165/ES/Estudio De La Separacion De Fases Cuanticas Para Transiciones Metal-Aislante Combinando Tecnicas Ab Initio, Analiticas Y Experimento
info:eu-repo/grantAgreement/MEC/Plan Nacional de I+D+i 2004-2007/MAT2009-08667/ES/Magnetismo Y Transporte De Carga Dependiente De Espin En Materiales Nanostructurados Ordenados/Desordenados Metalicos/Aislantes
info:eu-repo/grantAgreement/MICINN/Plan Nacional de I+D+i 2008-2011/SAF2011-25707/ES/SINTESIS DE MATERIALES HIBRIDOS BASADOS EN NANOPARTICULAS MAGNETICAS Y CERAMICAS BIOACTIVAS, DE INTERES EN HIPERTERMIA ANTITUMORAL
https://creativecommons.org/licenses/by-nc-nd/3.0/
open access
© 2013, Springer Nature. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
Nature Publishing Group
oai:minerva.usc.es:10347/327082024-02-10T01:03:24Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Vision-Specific Quality of Life: Laser-Assisted in situ Keratomileusis Versus Overnight Contact Lens Wear
González Pérez, Javier
Sánchez García, Ángel
Villa-Collar, César
Universidade de Santiago de Compostela. Departamento de Física Aplicada
LASIK
Overnight orthokeratology
Silicone-hydrogel CL continuous wear
Quality of life
NEI-RQL-42 scale
Objectives:
To compare the visual-related quality of life in myopic subjects with different refractive treatments such as continuous wear of silicone-hydrogel contact lenses (CL), corneal refractive therapy (CRT), and laser-assisted in situ keratomileusis (LASIK).
Methods:
The National Eye Institute Refractive Error Quality of Life Instrument (NEI RQL-42) questionnaire was administered to 96 subjects with a mean age of 30.0±7.9 years. There were 72 myopic subjects with a mean spherical equivalent of −2.74±0.98 D (−5.50 to −1.25 D). Subjects were corrected with LASIK (n=24), Paragon CRT orthokeratology lenses (n=24), and lotrafilcon A silicone-hydrogel CL under continuous wear (n=24). The NEI RQL-42 survey was used to compare differences between groups as well as with an emmetropic group (n=24).
Results:
After 1 year of treatment, significant differences were found among all groups in the subscales glare (P=0.017), symptoms (P=0.016), dependence on correction (P<0.001), and worry (P<0.001). The mean difference compared with emmetropes were −5.5% (P=0.063) for LASIK patients, −2.0% (P=0.212) for orthokeratology subjects, and +1.6% (P=0.934) for the silicone-hydrogel CL group.
Conclusions:
Myopic subjects analyzed in this study reported better vision-related quality of life when they were corrected with continuous wear silicone-hydrogel lenses. The average score reached by CRT was similar to emmetropes, which showed the main disadvantage in worry subscale. The patients who underwent LASIK had the lowest valuation, highlighting the decreases in scores of diurnal fluctuations, glare, and especially in expectations and worry subscales, due to the first and second subscales, but especially to the false expectations created about treatment.
2024-02-09T18:16:03Z
2024-02-09T18:16:03Z
2024-02-09T18:16:03Z
2019
journal article
González-Pérez, Javier O.D., Ph.D., F.I.A.C.L.E.; Sánchez García, Ángel O.D., M.Sc.; Villa-Collar, César O.D., Ph.D., F.A.A.O.. Vision-Specific Quality of Life: Laser-Assisted in situ Keratomileusis Versus Overnight Contact Lens Wear. Eye & Contact Lens: Science & Clinical Practice 45(1):p 34-39, January 2019. | DOI: 10.1097/ICL.0000000000000538
http://hdl.handle.net/10347/32708
10.1097/ICL.0000000000000538
1542-233X
eng
https://doi.org/10.1097/ICL.0000000000000538
open access
© 2018 Contact Lens Association of Ophthalmologists
Lippincott
Williams & Wilkins
oai:minerva.usc.es:10347/228752021-02-17T10:45:07Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
The Offner imaging spectrometer in quadrature
Prieto Blanco, Xesús
Montero Orille, Carlos
González Núñez, Héctor
Mouriz Cereijo, María Dolores
López Lago, María Elena
Fuente Carballo, Raúl de la
Universidade de Santiago de Compostela. Departamento de Física Aplicada
This is a proposal and description of a new configuration for an
Offner imaging spectrometer based on the theory of aberrations of off-plane
classical-ruled spherical diffraction gratings. This new spectrometer
comprises a concave mirror used in double reflection and a convex
reflection grating operating in quadrature, in a concentric layout. A very
simple procedure obtains designs that are anastigmatic for a given point on
the entrance slit and a given wavelength. Specific examples show that the
performance of this type of system improves the performance of analogous
conventional in-plane systems, when compactness and/or high spectral
resolution is of fundamental importance
2020-06-06T18:09:27Z
2020-06-06T18:09:27Z
2020-06-06T18:09:27Z
2010
journal article
Xesús Prieto-Blanco, Carlos Montero-Orille, Héctor González-Nuñez, María Dolores Mouriz, Elena López Lago, and Raúl de la Fuente, "The Offner imaging spectrometer in quadrature," Opt. Express 18, 12756-12769 (2010)
1094-4087
http://hdl.handle.net/10347/22875
10.1364/OE.18.012756
eng
https://doi.org/10.1364/OE.18.012756
open access
© 2010 Optical Society of America
OSA Publishing
oai:minerva.usc.es:10347/312782024-02-16T13:06:44Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Effect of the addition of coated SiO2 nanoparticles on the tribological behavior of a low-viscosity polyalphaolefin base oil
Mariño, Fátima
Liñeira del Río, José M.
Gonçalves, David E.P.
Seabra, Jorge H.O.
López, Enriqueta R.
Fernández, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Low-viscosity oil
Nanoadditives
Anti-wear additives
Surface modification of NPs
Electric vehicles
Automatic transmission fluids
This work reports tribological properties of PAO6 containing SiO2 nanoparticles modified with stearic-acid (SiO2-SA) as additives at concentrations (0.05, 0.10, 0.20, 0.30) wt% and the same concentration of SA as a dispersant. Tribological experiments were performed at 120 °C in pure sliding and rolling-sliding conditions (5% slide-to-roll ratio). All nanolubricants have better anti-friction capabilities than PAO6. The optimum concentration for friction reduction was 0.30 wt% for both tribological conditions. The best anti-wear results for the specimens tested in pure sliding conditions were achieved with PAO6 + 0.20 wt% SiO2-SA with reductions of 55%, 86% and 92%, in wear track width, wear track depth and wear area, respectively. Tribological mechanisms of the nanoparticles have been analyzed through roughness measurements, concluding that polishing, tribofilm and adsorption of the additives occur
2023-11-14T12:39:01Z
2023-11-14T12:39:01Z
2023-11-14T12:39:01Z
2023-06-22
journal article
Wear 530–531 (2023) 205025
0043-1648
http://hdl.handle.net/10347/31278
10.1016/j.wear.2023.205025
eng
https://doi.org/10.1016/j.wear.2023.205025
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112846RB-C22/ES/NANOMATERIALES PARA VEHICULOS ELECTRICOS: FLUIDOS DE TRANSMISION Y RECUBRIMIENTOS/
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2023 The Authors. Published by Elsevier B.V. This article is available under the Creative Commons CC-BY-NC-ND license and permits non-commercial use of the work as published, without adaptation or alteration provided the work is fully attributed
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/213482023-07-10T06:18:07Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2904com_10347_2890com_10347_2925col_10347_10699col_10347_12265col_10347_9937
Three-Dimensional Hybrid Mesoporous Scaffolds for Simvastatin Sustained Delivery with in Vitro Cell Compatibility
Vargas Osorio, Zulema
Luzardo Álvarez, Asteria María
Piñeiro Redondo, Yolanda
Vázquez Vázquez, Carlos
Gómez Amoza, José Luis
Blanco Méndez, José
Otero Espinar, Francisco Javier
Rivas Rey, José
Universidade de Santiago de Compostela. Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
The development of scaffolds with suitable physicochemical and mechanical properties allowing for the
structural regeneration of injured bone and recovery of the natural biological functionality is still a challenge in the tissue
engineering field. Nanostructured materials with added theranostic abilities, together with an interconnected hierarchy of pores,
offer the possibility to provide a new generation of bone implants. In this work, scaffolds with highly porous and resistant threedimensional structures have been successfully developed by homogeneously embedding mesoporous silica nanostructures in a
bioactive matrix of chitosan/κ-carrageenan. Moreover, magnetite (Fe3O4) nanoparticles were also added to the mesoporous
scaffold to include additional magnetic functionalities for diagnostic or therapeutic actions. The complete physicochemical
characterization shows mesoporous materials with a wide range of interconnected pores, remarkable surface roughness, and
large effective surface area, suitable for cell adhesion. In accordance to these properties, a simvastatin loading and release assay
showed high loading capacities and sustained release over a long period of time. Together with a suitable resistance against
degradation and biocompatible performance assessed by cell viability assays, these scaffolds show interesting features for
delivering drugs with activity in bone regeneration processes.
2020-04-13T22:47:23Z
2020-04-13T22:47:23Z
2020-04-13T22:47:23Z
2019
journal article
Vargas-Osorio, Z., Luzardo-Álvarez, A., Piñeiro, Y., Vázquez-Vázquez, C., Gómez-Amoza, J.L., Blanco-Méndez, J., Otero Espinar, F.J., Rivas, J. (2019) Three-Dimensional Hybrid Mesoporous Scaffolds for Simvastatin Sustained Delivery with in Vitro Cell Compatibility. "ACS Omega", 4 (3), 5496-5508
http://hdl.handle.net/10347/21348
10.1021/acsomega.8b03676
2470-1343
eng
https://doi.org/10.1021/acsomega.8b03676
info:eu-repo/grantAgreement/EC/H2020/686009
open access
Copyright © 2019 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits
copying and redistribution of the article or any adaptations for non-commercial purposes
American Chemical Society
oai:minerva.usc.es:10347/327992024-02-15T13:52:37Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Clinical performance of an objective methodology to categorize tear film lipid layer patterns
García Resúa, Carlos
Pena Verdeal, Hugo
Giráldez Fernández, María Jesús
Yebra-Pimentel Vilar, Eva
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Lipid layer pattern
Tearscope-plus
Tear film
Interference phenomena
Purpose: To validate the performance of a new objective application designated iDEAS (Dry Eye Assessment System) to categorize different zones of lipid layer patterns (LLPs) in one image. Material and methods: Using the Tearscopeplus and a digital camera attached to a slit-lamp, 50 images were captured and analyzed by 4 experienced optometrists. In each image, the observers outlined tear film zones identified as a specific LLP. Further, the categorization by the 4 optometrists (observers 1, 2, 3 and 4) was compared with the automatic system included in iDEAS (5th observer). Results: In general, observer 3 was classified as worse than all observers (observers 1, 2, 4 and automatic application, Wilcoxon test, <0.05). The automatic system behaved similarly to the remaining three observers (observers 1, 2 and 4) showing differences only for Open Meshwork LLP when compared with observer 4 (Wilcoxon test, p=0.02). For the remaining two observers (observers 1 and 2) there were not found statistical differences (Wilcoxon test, >0.05). Furthermore, we obtained a set of photographs per LLP category for which all optometrists showed agreement by using the new tool. After examining them, we detected the more characteristic features of each LLP to enhance the description of the patterns implemented by Guillon. Conclusions: The automatic application in the iDEAS framework can provide zones similar to the annotations made by experienced optometrists. Thus, the manual process done by experts can be automated with the benefit of being unaffected by subjective factors.
2024-02-12T13:18:11Z
2024-02-12T13:18:11Z
2024-02-12T13:18:11Z
2017
journal article
García Resúa, C., Pena Verdeal, H., Giráldez, M.J., Yebra-Pimentel Vilar, E. (2017) Clinical performance of an objective methodology to categorize tear film lipid layer patterns, Proceedings of SPIE, vol. 10453
0277-786X
http://hdl.handle.net/10347/32799
10.1117/12.2271845
1996-756X
eng
https://doi.org/10.1117/12.2271845
open access
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).
SPIE
oai:minerva.usc.es:10347/326342024-02-10T01:03:16Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Comparison of Central Corneal Thickness measured by Standard Ultrasound Pachymetry, Corneal Topography, Tono-Pachymetry and Anterior Segment Optical Coherence Tomography
González Pérez, Javier
Queiruga Piñeiro, Juan
Sánchez García, Ángel
González Meijome, Jose
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Central corneal thickness
Scheimpflug camera
Anterior segment optical coherence tomography
Interchangeability
Non-contact tono-pachymetry
Ultrasound pachymetry
Purpose: To compare central corneal thickness (CCT) measured by standard ultrasound pachymetry (USP), and three non-contact devices in healthy eyes.
Methods: A cross-sectional study of CCT measurement in 52 eyes of 52 healthy volunteers was done by a single examiner at Ocular Surface and Contact Lens Laboratory. Three consecutive measurements were done by standard USP, non-contact tono-pachymeter, Pentacam corneal topographer, and Anterior Segment Optical Coherence Tomography (AS-OCT). The mean values were used for assessment. The results were compared using multivariate ANOVA, linear regression, and Pearson correlation. Agreement among the devices was analyzed using mean differences and Bland-Altman analysis with 95% limits of agreement (LoA). Finally, reliability was analyzed using intraclass correlation coefficient (ICC).
Results: Mean CCT by ultrasound pachymeter, tono-pachymeter, corneal topographer and AS-OCT were 558.9 ± 31.2 µm, 525.8 ± 43.1 µm, 550.4 ± 30.5 µm, and 545.9 ± 30.5 µm respectively. There was a significant positive correlation between AS-OCT and USP (Pearson correlation = 0.957, p < 0.001), corneal topography and USP (Pearson correlation = 0.965, p < 0.001), and corneal topography and AS-OCT (Pearson correlation = 0.965, p < 0.001). There was a lower correlation between CT-1P tono-pachymeter and the other three modalities. Intraclass correlation coefficients show an excellent reliability between pairs except for CT-1P against the other three instruments that were found moderate.
Conclusions: CT-1P tono-pachymeter underestimates CCT measurements compared to Scheimpflug system, AS-OCT device, and USP. Mean CCT among USP, Pentacam and AS-OCT were comparable and had significant linear correlations. In clinical practice, these three modalities could be interchangeable in healthy patients.
2024-02-09T09:31:06Z
2024-02-09T09:31:06Z
2024-02-09T09:31:06Z
2018
journal article
González-Pérez J, Queiruga Piñeiro J, Sánchez García Á, González Méijome JM. Comparison of Central Corneal Thickness Measured by Standard Ultrasound Pachymetry, Corneal Topography, Tono-Pachymetry and Anterior Segment Optical Coherence Tomography. Curr Eye Res. 2018 Jul;43(7):866-872. doi: 10.1080/02713683.2018.1461910. Epub 2018 Apr 13.
0271-3683
http://hdl.handle.net/10347/32634
10.1080/02713683.2018.1461910
1460-2202
eng
https://doi.org/10.1080/02713683.2018.1461910
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Taylor and Francis Group
oai:minerva.usc.es:10347/319192024-01-20T01:02:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Física y Artes, un contexto interdisciplinar
Calvo Iglesias, Encina
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Motivación
Cine
Competencias
Actividades manipulativas
Literatura
Motivation
Film
Literature
Manipulative activities
Competences
La adaptación de la enseñanza universitaria al Espacio Europeo de Educación Superior
requiere incorporar el aprendizaje de competencias. En esta comunicación se presentan
algunas de las actividades introducidas en los Grados de Ingeniería Química, de Geomática y Topografía y de Industrias Agroalimentarias, para desarrollar: el espíritu crítico, la creatividad y la competencia oral. Una de las actividades que se describe es la realización de un trabajo en grupo, que relacione la física con aspectos de la vida diaria y que pueda resultar atractivo al alumnado porque integre algunas de sus aficiones: la lectura, el cine y la realización de un video con el móvil. Los resultados de estos trabajos, redacción y exposición, así como la valoración de los mismos por el alumnado es positiva, por lo que se recomienda la incorporación de estos recursos didácticos a otras asignaturas.
The adaptation of university education to the European Higher Education Area (EHEA) requires incorporating learning skills. In this communication are some of the activities developed in degrees in Chemical Engineering, Engineering in Geomatic and Topography and Agrarian Food Industries, to develop are presented: critical thinking, creativity and oral proficiency. One of the activities described is the realization of group work that relates to the physical aspects of daily life and can be attractive to students because it integrates some of his hobbies: reading, cinema, performing a video with mobile. The results of these studies, writing and presentation, as well as evaluate them by the students is positive, so that the incorporation of these teaching resources to other subjects is recommended.
2024-01-19T13:52:07Z
2024-01-19T13:52:07Z
2024-01-19T13:52:07Z
2015
journal article
Calvo Iglesias, Encina (2015). Física y Artes, un contexto interdisciplinar. IJERI: International Journal of Educational Research and Innovation, (3), 134–142. Retrieved from https://www.upo.es/revistas/index.php/IJERI/article/view/1449
2386-4303
http://hdl.handle.net/10347/31919
spa
https://www.upo.es/revistas/index.php/IJERI/article/view/1449/1164
http://creativecommons.org/licenses/by/4.0/
open access
Atribución 4.0 Internacional
Universidad Pablo Olavide
oai:minerva.usc.es:10347/321062024-01-31T01:03:19Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
High-Pressure Thermophysical Properties of Eight Paraffinic, Naphthenic, Polyalphaolefin and Ester Base Oils
Villamayor, Antía
García Guimarey, María Jesús
Mariño Fernández, Fátima
Liñeira del Río, José M.
Urquiola, Francisco
Urchegui, Raquel
Fernandez, Josefa
Comuñas, María J.P.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
High pressure
Mineral oils
Synthetic oils
Density
Isothermal compressibility
Thermal expasion coefficient
In this work, the thermophysical properties of four mineral (paraffinic and naphthenic)
and four synthetic (polyalphaolefin and ester) base oils are measured. Knowledge of these properties is of vital importance for the correct and optimal formulation and design of lubricants, and for the development of equations of state and transport models that adequately represent their properties.
Density, isothermal compressibility, thermal expansion coefficient, dynamic viscosity, pressure–viscosity coefficient, and contact angle were determined. To carry out this work, a pρT apparatus, a rotational viscometer, a falling body viscometer, and a contact angle analyzer were used. Highest densities were found for the polyalphaolefin and ester synthetic oils, increasing around 5% from 0.1 to 100 MPa for all the base oils. The density of the synthetic oils is less dependent on temperature changes. For the expansivity and compressibility of all the base oils, decreases with pressure of up to 35% and 45% were observed. From the contact angle measurements, it was observed that base oils with a higher viscosity grade have a worse wetting. The greatest effect of pressure on the dynamic
viscosity was obtained for the naphthenic mineral oil and the lowest effect for the polyalphaolefin oil. Paraffinic and naphthenic oils present the highest universal pressure–viscosity coefficients.
2024-01-30T12:37:59Z
2024-01-30T12:37:59Z
2024-01-30T12:37:59Z
2023-01
journal article
Villamayor, A.; Guimarey, M.J.G.; Mariño, F.; Liñeira del Río, J.M.; Urquiola, F.; Urchegui, R.; Comuñas, M.J.P.; Fernández, J. High-Pressure Thermophysical Properties of Eight Paraffinic, Naphthenic, Polyalphaolefin and Ester Base Oils. Lubricants 2023, 11, 55. https://doi.org/10.3390/ lubricants11020055
http://hdl.handle.net/10347/32106
10.3390/lubricants11020055
2075-4442
eng
https://www.mdpi.com/2075-4442/11/2/55
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
MDPI
oai:minerva.usc.es:10347/321012024-01-31T01:03:23Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Effect of ZrO2 nanoparticles on thermophysical and rheological properties of three synthetic oils
García Guimarey, María Jesús
Salgado, Miguel R.
Comuñas, Maria JP
López, Enriqueta R.
Amigo, Alfredo
Cabaleiro, David
Lugo, Luis
Fernández, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Synthetic oils
ZrO2 nanoparticles
Nanolubricants
Adiabatic bulk modulus
Density
Rheology
This article presents an experimental study on some thermophysical properties (density, viscosity and adiabatic bulk modulus) of six nanolubricants based on synthetic oils and ZrO2 nanoparticles. Two-step method with ultrasonic disruptor was used to prepare the nanodispersions. The morphology, crystalline degree and elemental composition of nanoparticles were analyzed by electron microscopy. Visual observation, temporal variation of refractive index and dynamic light scattering were used to analyze the stability of the nanolubricants and the average size of the aggregates. The presence of new interactions between nanoparticles and base oils was studied through Fourier transform infrared spectrometer. Vibrating tube densimeters, rotational viscometer and rheometer equipped with cone-plate geometry were used within the temperature range from (278.15 to
373.15) K. The ability of some theoretical simple models to predict densities and viscosities of these nanolubricants as a function of temperature and nanoparticle concentration was also checked.
2024-01-30T12:21:28Z
2024-01-30T12:21:28Z
2024-01-30T12:21:28Z
2018-04-10
journal article
María J.G. Guimarey, Miguel R. Salgado, María J.P. Comuñas, Enriqueta R. López, Alfredo Amigo, David Cabaleiro, Luis Lugo, Josefa Fernández, Effect of ZrO2 nanoparticles on thermophysical and rheological properties of three synthetic oils, Journal of Molecular Liquids, Volume 262, 2018, Pages 126-138, https://doi.org/10.1016/j.molliq.2018.04.027.
0167-7322
http://hdl.handle.net/10347/32101
10.1016/j.molliq.2018.04.027
1873-3166
eng
https://www.sciencedirect.com/science/article/pii/S0167732218303507
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
CC BY-NC-ND
Elsevier
oai:minerva.usc.es:10347/213502023-07-10T06:18:12Zcom_10347_2899com_10347_2890com_10347_2888com_10347_227com_10347_2919com_10347_2891col_10347_13398col_10347_10699
Validation of Potential Effects on Human Health of in Vivo Experimental Models Studied in Rats Exposed to Sub-Thermal Radiofrequency. Possible Health Risks Due to the Interaction of Electromagnetic Pollution and Environmental Particles
Salas Sánchez, Aarón Ángel
López Furelos, Alberto
Rodríguez González, Juan Antonio
Ares Pena, Francisco José
López Martín, María Elena
Universidade de Santiago de Compostela. Departamento de Ciencias Morfolóxicas
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Bioelectromagnetic effects
Electromagnetic radiation effects
Specific absorption rate
Studies are based on the exposure of Sprague–Dawley rats (250 male and 250 female
rats) to electromagnetic fields (EMF) at different frequencies in standing and travelling wave chambers.
Values of specific absortion rate (SAR) for all of these experiments were obtained from commercially
available FDTD-based simulation software based on numerical phantom animals. An experimental radiation
system was developed with a standing-wave cavity which keeps electromagnetic parameters constant while
facilitating stress-free exposure of animals to non-thermal radiation. This makes it possible to directly
measure the power absorbed by the animal and determine whole-body mean SAR according to weight.
All studies using this setup were performed with global system for mobile communication (GSM) radiation
at 900 MHz. The simple picrotoxin model made allow to identify morphological signs of neurotoxicity in
rat brain tissue. Experiments involving travelling waves were done in a commercial Gigahertz Transverse
ElectroMagnetic (GTEM) chamber connected to one or two vector signal generators (to carry single
or multiple EMF exposure frequencies). In the diathermy model, rat thyroid and thymus exposed to
2.45 GHz radiation showed visible morphological and immune effects. Cellular stress in the cerebral cortex,
the cerebellum or both seems to be more associated with the type of signal than with additive effects of
combined frequencies. Finally, some hypothesis related with the future models about the ElectroMagnetic
(EM) pollution are established. In an urban environmental that combines the electromagnetic and chemical
pollution of environmental particles, cortical excitability, inflammatory response, and cell injury can be
modified.
2020-04-13T23:04:27Z
2020-04-13T23:04:27Z
2020-04-13T23:04:27Z
2019
journal article
A. A. Salas-Sánchez, A. López-Furelos, J. A. Rodríguez-González, F. J. Ares-Pena and M. E. López-Martín, "Validation of Potential Effects on Human Health of in Vivo Experimental Models Studied in Rats Exposed to Sub-Thermal Radiofrequency. Possible Health Risks Due to the Interaction of Electromagnetic Pollution and Environmental Particles," in IEEE Access, vol. 7, pp. 79186-79198, 2019
http://hdl.handle.net/10347/21350
10.1109/ACCESS.2019.2923581
2169-3536
eng
https://doi.org/10.1109/ACCESS.2019.2923581
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/TEC2017-86110-R/ES/DETERMINACION DEL NIVEL DE CONCENTRACION DE PARTICULAS ATMOSFERICAS CON ANTENAS: METODO DE MONITORIZACION PARA DESARROLLAR UNA ESTRATEGIA DE PROTECCION INTEGRAL DEL CIUDADANO
https://creativecommons.org/licenses/by/3.0/
open access
© 2019 by the authors. This work is licensed under a Creative Commons Attribution 3.0 License
IEEE
oai:minerva.usc.es:10347/321362024-02-01T01:03:08Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Volumetric Behavior of Some Motor and Gear-Boxes Oils at High Pressure: Compressibility Estimation at EHL Conditions
García Guimarey, María Jesús
Comuñas, Maria JP
López, Enriqueta R.
Amigo, Alfredo
Fernández, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Gear-boxes oils
Pressure
EHL conditions
Characterization of elastohydrodynamic lubrication, EHL, contacts requires an appropriate EoS for the lubricant. Experimental viscosities and speeds of sound of six lubricants
from 278.15 to 398.15 K at 0.1 MPa together with densities up to 120 MPa are reported. Tammann-Tait and the two EoSs based on the scaling concept describe the experimental densities of the six oils with average deviations lower to 0.03%. DowsonHigginson and Zhu and Wen equations currently used in numerical simulations of the EHL regime predict these
experimental densities with AADs lower than 0.5%. The prediction ability for volumetric properties, mainly isothermal compressibility, of these five EoSs up to 3000 MPa, which can be reached in EHL lubrication, was evaluated. An asymptotic behavior is observed when density is plotted versus pressure for Dowson-Higginson and Zhu and Wen equation, which is not a realistic behavior. The EoSs used in the correlations predict more reasonable trends with pressure
2024-01-31T08:46:10Z
2024-01-31T08:46:10Z
2024-01-31T08:46:10Z
2017-08-29
journal article
María J. G. Guimarey, María J. P. Comuñas, Enriqueta R. López, Alfredo Amigo, and Josefa Fernández Industrial & Engineering Chemistry Research 2017 56 (38), 10877-10885 DOI: 10.1021/acs.iecr.7b02002
0888-5885
http://hdl.handle.net/10347/32136
10.1021/acs.iecr.7b02002
1520-5045
eng
https://doi.org/10.1021/acs.iecr.7b02002
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
Atribución-NoComercial-CompartirIgual 4.0 Internacional
American Chemical Society Publications
oai:minerva.usc.es:10347/218012020-04-28T02:01:44Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Laser-based surface multistructuring using optical elements and the Talbot effect
Aymerich López, María de la Inmaculada
Nieto García, Daniel
Flores Arias, María Teresa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Laser materials processing
Talbot and self-imaging effects
Microstructure fabrication
Micro-optical devices
Micro-optics
We present a laser based technique combined with the Talbot effect for microstructuring surfaces. The use of the Talbot effect is introduced as a solution to avoid damage of the periodic object used for micropattering different surfaces during the ablation process. The fabrication of two periodic objects (a mask and a microlens array) for micropattering surfaces and the identification of their Talbot planes is presented. A metal foil is ablated at distances corresponding to selected Talbot planes of the periodic objects. The setup allows us to design the desired pattern and the result is a multistructured surface with a high number of identical microholes, achieving a minimum diameter around 4μm. The different aspect of the periodic object working in direct contact and working at these Talbot distances is shown. These pictures reveal the advantages of working of using Talbot effect for a rapid, repeatable and no-contaminant multistructuring. Some industrial applications are illustrated.
2020-04-27T14:02:11Z
2020-04-27T14:02:11Z
2020-04-27T14:02:11Z
2015
journal article
María Aymerich, Daniel Nieto, and María Teresa Flores-Arias, "Laser-based surface multistructuring using optical elements and the Talbot effect," Opt. Express 23, 24369-24382 (2015)
http://hdl.handle.net/10347/21801
10.1364/OE.23.024369
1094-4087
eng
https://doi.org/10.1364/OE.23.024369
https://creativecommons.org/licenses/by/4.0/
open access
© 2015 Optical Society of America. This article is under a Creative Commons Attribution 4.0 International License (CC BY 4.0)
OSA Publishing
oai:minerva.usc.es:10347/109782020-03-04T11:24:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699oai:minerva.usc.es:10347/239902023-07-10T06:21:37Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Quantum Photonic Simulation of Spin-Magnetic Field Coupling and Atom-Optical Field Interaction
Liñares Beiras, Jesús
Prieto Blanco, Xesús
Carral López, Gabriel María
Nistal Fernández, María Concepción
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Integrated photonics
Quantum optics
Quantum simulation
In this work, we present the physical simulation of the dynamical and topological properties of atom-field quantum interacting systems by means of integrated quantum photonic devices. In particular, we simulate mechanical systems used, for example, for quantum processing and requiring a very complex technology such as a spin-1/2 particle interacting with an external classical time-dependent magnetic field and a two-level atom under the action of an external classical time-dependent electric (optical) field (light-matter interaction). The photonic device consists of integrated optical waveguides supporting two collinear or codirectional modes, which are coupled by integrated optical gratings. We show that the single-photon quantum description of the dynamics of this photonic device is a quantum physical simulation of both aforementioned interacting systems. The two-mode photonic device with a single-photon quantum state represents the quantum system, and the optical grating corresponds to an external field. Likewise, we also present the generation of Aharonov–Anandan geometric phases within this photonic device, which also appear in the simulated systems. On the other hand, this photonic simulator can be regarded as a basic brick for constructing more complex photonic simulators. We present a few examples where optical gratings interacting with several collinear and/or codirectional modes are used in order to illustrate the new possibilities for quantum simulation
2020-12-15T13:56:32Z
2020-12-15T13:56:32Z
2020-12-15T13:56:32Z
2020
journal article
Liñares, J.; Prieto-Blanco, X.; Carral, G.M.; Nistal, M.C. Quantum Photonic Simulation of Spin-Magnetic Field Coupling and Atom-Optical Field Interaction. Appl. Sci. 2020, 10, 8850
http://hdl.handle.net/10347/23990
10.3390/app10248850
2076-3417
eng
https://doi.org/10.3390/app10248850
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-78773-C2-2-P/ES/FABRICACION Y CARACTERIZACION DE ELEMENTOS OPTICOS DIFRACTIVOS DE AMPLITUD Y FASE PRODUCIDOS POR FOTOLITOGRAFIA E INTERCAMBIO IONICO EN VIDRIO
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/184522020-01-31T13:50:37Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Echegaray—Fiscal Scientist and More
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
2019-03-21T13:37:46Z
2019-03-21T13:37:46Z
2019-03-21T13:37:46Z
2000
journal article
Mira Pérez, J (2000). Echegaray—Fiscal Scientist and More. Physics Today 53, 6, 76; doi: 10.1063/1.1306382
0031-9228
http://hdl.handle.net/10347/18452
10.1063/1.1306382
eng
https://doi.org/10.1063/1.1306382
open access
© 2000 American Institute of Physics
AIP Publishing
oai:minerva.usc.es:10347/175382020-01-31T08:04:58Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Diseño de una rúbrica para evaluar la comunicación oral en ingeniería
Calvo Iglesias, Encina
Calvo Iglesias, María Silvia
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Rúbrica
Revisión por pares
Comunicación oral
Trabajo en equipo
Evaluación compartida
Rubric
Shared evaluation
Peer review
Oral communication
Teamwork
El aprendizaje por competencias es un requisito que deben cumplir las nuevas titulaciones adaptadas al Espacio Europeo de Educación Superior. Entre las diferentes competencias a alcanzar, la competencia oral es de gran importancia para el futuro laboral de los estudiantes de ingeniería y debería fomentarse desde el primer curso universitario. El objetivo de este trabajo es fomentar la incorporación de competencias lingüísticas en la ingeniería, así como diseñar e implementar una rúbrica para la evaluación de dichas competencias, examinar los resultados obtenidos, analizar su alcance y posibles propuestas de mejora. Con este fin, se presenta una experiencia realizada, dentro de la asignatura de Física del primer curso del Grado de Ingeniería Química, en la que se ha introducido como actividad evaluable la exposición oral de un trabajo en grupo. La evaluación de la competencia oral en esta actividad ha sido realizada conjuntamente por la profesora y alumnado mediante una rúbrica. Los resultados obtenidos muestran que la rúbrica es útil como orientación en la preparación de la exposición oral. Además, se ha observado que su uso mejora algunos aspectos de las presentaciones orales, como por ejemplo el diseño de las diapositivas y la estructura de la presentación. En futuras experiencias, se prevé mejorar la rúbrica para minimizar la influencia del sesgo de la indulgencia, así como evitar un apoyo excesivo en la lectura del guión. Así mismo, se prevé conocer la opinión del alumnado sobre su utilidad, para obtener más información sobre el impacto de su uso
ABSTRACT.
Competence based teaching and learning is a requirement to be met by new degrees adapted to the European Higher Education Area. Among the different competencies to be achieved, oral communication is of great importance for the future work of engineering students and it should be encouraged from the first university course. The aim of this research is to incorporate linguistic competencies in engineering, as well as to design and implement a rubric for the assessment of such competencies; to analyze the extent of the
results and to suggest further improvements. To this aim, we present an experience carried out within the Physics subject during the first year of the degree in Chemical Engineering. We introduced an assessment of oral competencies in teamwork’s activity.
The assessment of oral competencies was carried out both by the lecturer and the students using a rubric score. The results show that rubrics are useful as a guideline in the preparation of the oral speech. Besides, using a rubric improves some aspects of the oral presentations such as slide design and its formal structure. In future work, we would like to improve the rubric design so as to minimize the influence of indulgence bias as well as to avoid the abuse of script reading. Moreover, we foresee enquiring students about rubric usefulness, so as to obtain more information on the impact of its use
2018-10-20T15:09:34Z
2018-10-20T15:09:34Z
2018-10-20T15:09:34Z
2017
journal article
Calvo, I., & Calvo, S. (2017). Diseño de una rúbrica para evaluar la comunicación oral en ingeniería International Journal of Educational Research and Innovation (IJERI), 7, 91-102
2386-4303
http://hdl.handle.net/10347/17538
spa
https://www.upo.es/revistas/index.php/IJERI/article/view/2305
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Este obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-CompartirIgual 4.0 Internacional
Universidad Pablo de Olavide
oai:minerva.usc.es:10347/307682024-03-04T08:27:54Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Biomechanical characteristics of different methods of neo-chordal fixation to the papillary muscles
Fernández, Luis
Martínez Monzonís, Amparo
El-Diasty, Mohammad M.
Álvarez Lorenzo, Carmen Isabel
Concheiro Nine, Ángel Joaquín
Fernández González, Ángel Luis
Universidade de Santiago de Compostela. Departamento de Cirurxía e Especialidades Médico-Cirúrxicas
Universidade de Santiago de Compostela. Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Chordal replacement
Mitral valve repair
Polytetrafluoroethylene
Background and Aim of the Study
Several techniques have been described for neo-chordal fixation to the papillary muscles without any reported clinical differences. The objective of this study is to compare in vitro the biomechanical properties of four of these common techniques.
Methods
We studied the biomechanical properties of expanded polytetrafluoroethylene neo-chordal fixation using four techniques: nonknotted simple stitch, nonknotted figure-of-eight stitch, knotted pledgeted mattress stitch, and knotted pledgeted stitch using commercially available prefabricated loops. Neo-chordae were submitted to a total of 20 traction-relaxation cycles with incremental loads of 1, 2, and 4 N. We calculated the elongation, the force-strain curve, elasticity, and the maximum tolerated load before neo-chordal failure.
Results
The elongation of the neo-chordae was lowest in the simple stitch followed by the figure-of-eight, the pledgeted mattress, and he commercially prefabricated loops (p < .001). Conversely, the elastic modulus was highest in the simple stitch followed by the figure-of-eight, the pledgeted mattress, and the prefabricated loops (p < .001). The maximum tolerated load was similar with the simple stitch (28.87 N) and with the figure-of-eight stitch (31.39 N) but was significantly lower with the pledgeted mattress stitch (20.51 N) and with the prefabricated loops (7.78 N).
Conclusion
In vitro, neo-chordal fixation by nonknotted simple or nonknotted figure-of-eight stitches resulted in less compliance as opposed to the use of knotted pledgeted stitches. Fixation technique seemed to influence neo-chordal biomechanical properties, however, it did not seem to affect the strength of the suture when subjected to loads within physiological ranges
2023-06-23T07:52:43Z
2023-06-23T07:52:43Z
2023-06-23T07:52:43Z
2022
journal article
Fernández L, Monzonís AM, El‐Diasty MM, Álvarez‐Lorenzo C, Concheiro Á, Fernández ÁL. Biomechanical characteristics of different methods of neo‐chordal fixation to the papillary muscles. J Card Surg. 2022;37:4408‐4415. doi:10.1111/jocs.17027
0886-0440
http://hdl.handle.net/10347/30768
10.1111/jocs.17027
1540-8191
eng
https://doi.org/10.1111/jocs.17027
http://creativecommons.org/licenses/by/4.0/
open access
© 2022 The Authors. Journal of Cardiac Surgery published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Wiley
oai:minerva.usc.es:10347/227982020-06-06T02:01:14Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Frequency gating to isolate single attosecond pulses with overdense plasmas using particle-in-cell simulations
Blanco Fraga, Manuel
Flores Arias, María Teresa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
We present the isolation of single attosecond pulses for multi-cycle and few-cycle
laser pulses from high harmonic generation in overdense plasmas, calculated with particle-incell
simulations. By the combination of two laser pulses of equal amplitude and a small frequency
shift between them, we demonstrate that it is possible to shorten the region in which the
laser pulse is most intense, therefore restricting the generation of high harmonic orders in the
form of attosecond pulses to a narrower time window. The creation of this window is achieved
due to the combination of the laser pulse envelope and the slow oscillating wave obtained from
the coherent sum of the two pulses. A parametric scan, performed with particle-in-cell simulations,
reveals how the pulse isolation behaves for different input laser pulse lengths and which
are the optimal frequency shifts between the two laser pulses in each case, giving the conditions
for having a good isolation of an attosecond pulse when working with laser-plasma interaction
in overdense targets.
2020-06-05T18:36:19Z
2020-06-05T18:36:19Z
2020-06-05T18:36:19Z
2017
journal article
M. Blanco and M.T. Flores-Arias, "Frequency gating to isolate single attosecond pulses with overdense plasmas using particle-in-cell simulations," Opt. Express 25, 13372-13381 (2017)
http://hdl.handle.net/10347/22798
10.1364/OE.25.013372
1094-4087
eng
https://doi.org/10.1364/OE.25.013372
open access
© 2017 Optical Society of America. Open Access. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
Optical Society of America
oai:minerva.usc.es:10347/212052020-04-07T02:01:54Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Light-Emitting Diode Photobiomodulation After Cerebral Ischemia
Argibay González, Bárbara
Campos Pérez, Francisco
Pérez Mato, María
Vieites Prado, Alba
Correa Paz, Clara
López Arias, Esteban
Silva Candal, Andrés da
Moreno de las Cuevas, Vicente
Montero Orille, Carlos
Sobrino Moreiras, Tomás
Castillo Sánchez, José Antonio
Iglesias Rey, Ramón
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Functional recovery
Ischemic stroke
Photobiomodulation therapy
Magnetic resonance imaging
Animal model
Intracerebral hemorrhage
Photobiomodulation (PBM) therapy is a promising therapeutic approach for several pathologies, including stroke. The biological effects of PBM for the treatment of cerebral ischemia have previously been explored as a neuroprotective strategy using different light sources, wavelengths, and incident light powers. However, the capability of PBM as a novel alternative therapy to stimulate the recovery of the injured neuronal tissue after ischemic stroke has been poorly explored. The aim of this study was to investigate the low-level light irradiation therapy by using Light Emitting Diodes (LEDs) as potential therapeutic strategy for stroke. The LED photobiomodulation (continuous wave, 830 nm, 0.2–0.6 J/cm2) was firstly evaluated at different energy densities in C17.2 immortalized mouse neural progenitor cell lines, in order to observe if this treatment had any effect on cells, in terms of proliferation and viability. Then, the PBM-LED effect (continuous wave, 830 nm, 0.28 J/cm2 at brain cortex) on long-term recovery (12 weeks) was analyzed in ischemic animal model by means lesion reduction, behavioral deficits, and functional magnetic resonance imaging (fMRI). Analysis of cellular proliferation after PBM was significantly increased (1 mW) in all different exposure times used; however, this effect could not be replicated in vivo experimental conditions, as PBM did not show an infarct reduction or functional recovery. Despite the promising therapeutic effect described for PBM, further preclinical studies are necessary to optimize the therapeutic window of this novel therapy, in terms of the mechanism associated to neurorecovery and to reduce the risk of failure in futures clinical trials.
2020-04-06T20:04:32Z
2020-04-06T20:04:32Z
2020-04-06T20:04:32Z
2019
journal article
Argibay, B., Campos, F., Pérez-Mato, M., Vieites-Prado, A. et al. (2019). Light-Emitting Diode Photobiomodulation After Cerebral Ischemia. "Frontiers in Neurology", vol. 10, 911
http://hdl.handle.net/10347/21205
10.3389/fneur.2019.00911
1664-2295
eng
https://doi.org/10.3389/fneur.2019.00911
https://creativecommons.org/licenses/by/4.0/
open access
Copyright © 2019 Argibay, Campos, Perez-Mato, Vieites-Prado, Correa-Paz, López-Arias, Da Silva-Candal, Moreno, Montero, Sobrino, Castillo and Iglesias-Rey. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms
Frontiers Media
oai:minerva.usc.es:10347/168032022-03-16T12:53:47Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Towards improved magnetic fluid hyperthermia: major-loops to diminish variations in local heating
Muñoz Menéndez, Cristina
Serantes Abalo, David
Ruso Beiras, Juan Manuel
Baldomir Fernández, Daniel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Magnetic hyperthermia
Magnetic nanoparticles
Local heating
In the context of using magnetic nanoparticles for heat-mediated applications, the need of an accurate knowledge of the local (at the nanoparticle level) heat generation in addition to the usually studied global counterpart has been recently highlighted. Such a need requires accurate knowledge of the links among the intrinsic particle properties, system characteristics and experimental conditions. In this work we have investigated the role of the particles' anisotropy polydispersity in relation to the amplitude (Hmax) of the AC magnetic field using a Monte Carlo technique. Our results indicate that it is better to use particles with large anisotropy for enhancing global heating, whereas for achieving homogeneous local heating it is better to use lower anisotropy particles. The latter ensures that most of the system undergoes major-loop hysteresis conditions, which is the key-point. This is equivalent to say that low-anisotropy particles (i.e. with less heating capability) may be better for accurate heat-mediated applications, which goes against some research trends in the literature that seek for large anisotropy (and hence heating) values
2018-06-13T10:16:44Z
2018-06-13T10:16:44Z
2018-06-13T10:16:44Z
2017-05-11
journal article
Munoz-Menendez, C., Serantes, D., Ruso, J., & Baldomir, D. (2017). Towards improved magnetic fluid hyperthermia: major-loops to diminish variations in local heating. Physical Chemistry Chemical Physics, 19(22), 14527-14532. doi: 10.1039/c7cp01442b
1463-9076
http://hdl.handle.net/10347/16803
10.1039/C7CP01442B
1463-9084
eng
https://doi.org/10.1039/c7cp01442b
open access
© Royal Society of Chemistry 2017
Royal Society of Chemistry
oai:minerva.usc.es:10347/321052024-01-31T01:03:20Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Nanoscale insights into the structure of solution-processed graphene by x-ray scattering
Yan, Zhengyu
García Guimarey, María Jesús
Parvez, Khaled
Dun, Chaochao
Read, Oliver
Forrest, Thomas
Urban, Jeffrey J.
Abdelkader, Amor M.
Casiraghi, Cinzia
Mirihanage, Wajira
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Atomic structure
X-ray pair distribution function
Solution-processed graphene
Chemical exfoliation is an attractive approach for the synthesis of graphene due to its low cost and simplicity. However, challenges still remain in the characterization of solution-processed graphene, in particular with atomic resolution. Through this work we demonstrate the x-ray pair distribution function as a novel approach to study solution-processed graphene or other 2D materials with atomic resolution, directly in solution, produced by liquid-phase and electrochemical exfoliations.
The results show the disappearance of long-range atomic correlations, in both cases, confirming the production of single and few-layer graphene. In addition, a considerable ring distortion has been observed as compared to graphite, irrespective of the solvent used: the normal surface angle to the sheet of the powder sample should be less than 6◦, compatible with ripples formation observed in suspended graphene. We attribute this effect to the interaction of solvent molecules with the graphene nanosheets.
2024-01-30T12:32:34Z
2024-01-30T12:32:34Z
2024-01-30T12:32:34Z
2022-11-03
journal article
Zhengyu Yan et al (2023). Nanoscale insights into the structure of solution-processed graphene by x-ray scattering, 2D Mater. 10 015006
http://hdl.handle.net/10347/32105
10.1088/2053-1583/ac9b6f
2053-1583
eng
https://iopscience.iop.org/article/10.1088/2053-1583/ac9b6f
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
CC BY 4.0 DEED Attribution 4.0 International
IOP Publishing
oai:minerva.usc.es:10347/179382020-03-31T09:33:40Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_15550com_10347_15468com_10347_2948com_10347_2892col_10347_10699col_10347_15551col_10347_15442
The time course of the effects of central and peripheral cues on visual processing: an event-related potentials study
Doallo Pesado, Sonia
Lorenzo López, Laura
Vizoso Gómez, Carmen
Rodríguez Holguín, Socorro
Amenedo Losada, María Elena
Bará Viñas, Salvador Xurxo
Cadaveira Mahía, Fernando
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Psicoloxía Clínica e Psicobioloxía
Visuospatial attention
Central cues
Peripheral cues
P1
Event-related potentials
ERPs
Atención visoespacial
Chaves centrais
Chaves periféricas
Potenciais evocados
Objective: The varying results of visual event-related potential (ERP) studies of central and peripheral cueing suggest that these types of cue may modulate stimuli processing with different time courses. The aim of this study was to investigate differences in the time course of facilitatory effects on the visual processing induced by peripheral and central cues.
Methods: ERPs were recorded for visual target stimuli that were preceded by informative-central, informative-peripheral or uninformative-peripheral cues with stimulus onset asynchronies (SOAs) of 100, 300, 500 or 700 ms.
Results: Validly cued stimuli elicited an enhanced P1 component with peripheral cueing at 100 ms SOA. P1 amplitude in valid trials was reduced at 300, 500 and 700 ms SOAs with uninformative-peripheral cueing, but only at 500 ms SOA with informative-peripheral cueing. With informative-central cueing, there was no validity effect on P1.
Conclusions: These results suggest that the automatic attraction of attention by a peripheral cue results in improved sensory processing at the cued location. This facilitation is replaced by an inhibitory effect when SOA increases, although cue informativeness may modulate this effect. Central cueing does not affect sensory processing at the P1 level
2018-12-13T07:53:16Z
2018-12-13T07:53:16Z
2018-12-13T07:53:16Z
2004
journal article
Doallo S; Lorenzo-López L; Vizoso C, Rodríguez Holguín S, Amenedo E, Bará S, Cadaveira F. (2004). The time course of the effects of central and peripheral cues on visual processing: an event-related potentials study. Clinical Neurophysiology 115, 199–210
1388-2457
http://hdl.handle.net/10347/17938
10.1016/S1388-2457(03)00317-1
1872-8952
eng
https://doi.org/10.1016/S1388-2457(03)00317-1
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Elsevier
oai:minerva.usc.es:10347/320582024-02-15T13:53:52Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Categorization of the Aqueous Deficient Dry Eye by a Cut-Off Criterion of TMH Measured with Tearscope
Sabucedo-Villamarin, Belen
Pena Verdeal, Hugo
García Queiruga, Jacobo
Giráldez Fernández, María Jesús
García Resúa, Carlos
Yebra-Pimentel Vilar, Eva
Universidade de Santiago de Compostela. Departamento de Física Aplicada
ADDE
TMH
Tear Film and Ocular Surface Society in the second Dry Eye Workshop (TFOS DEWS-II)
Tearscope
Cut-off value
A decrease in the Tear Meniscus Height (TMH) has been proposed as a useful indicator for Aqueous Deficient Dry Eye (ADDE) categorization. The present study aimed to calculate a TMH cut-off criterion for the ADDE categorisation or severity assessment with the Tearscope. 200 participants with a previous Dry Eye Disease (DED) diagnosis according to TFOS DEWS-II criteria were recruited. TMH by slit-lamp illumination and Lipid Layer Pattern (LLP) with Tearscope were assessed to categorise the participants into the ADDE or the Evaporative Dry Eye (EDE) group. The ADDE group was also subdivided into Mild-moderate ADDE and Moderate-severe ADDE based on TMH with slit-lamp. Additionally, the TMH was measured by Tearscope (TMH-Tc). Receiver Operating Characteristics showed that the TMH-Tc have a diagnostic capability to differentiate between ADDE and EDE participants, and between Mild-moderate or Moderate-severe ADDE, with a cut-off value of 0.159 mm (AUC = 0.843 ± 0.035, p < 0.001; sensitivity: 86.4%; specificity: 75.4%) and 0.105 mm (AUC = 0.953 ± 0.025, p < 0.001; sensitivity: 98.1%; specificity: 80.0%), respectively. The present study proposed a cut-off criterion to differentiate between ADDE and EDE participants, or between ADDE severities through TMH assessed by Tearscope.
2024-01-30T07:55:12Z
2024-01-30T07:55:12Z
2024-01-30T07:55:12Z
2022-12
journal article
2075-1729
http://hdl.handle.net/10347/32058
10.3390/life12122007
eng
https://www.mdpi.com/2075-1729/12/12/2007
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/321082024-01-31T01:03:17Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Surface tension, wettability and tribological properties of a low viscosity oil using CaCO3 and CeF3 nanoparticles as addiitives
Liñeira del Río, José M.
Alvarez Alonso, Alba
García Guimarey, María Jesús
Prado, Jose I.
Fernandez, Josefa
Amigo, Alfredo
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Lubricantes
Sistemas EV
Nanopartículas
Transmisións
The rise of the electric vehicles as a more sustainable transport alternative makes it necessary to study new transmission fluids that adapt to their needs and improve their efficiency. The thermophysical properties (contact angle, surface tension and rheology) and tribological properties (friction and wear) of potential PAO8 transmission nanofluids using CaCO3 and CeF3 nanoparticles as additives are evaluated at mass concentrations of
0.05, 0.10, 0.15 and 0.20 wt%. Low contact angle and surface tension values are obtained, indicating good wettability. When the nanoparticles are used as PAO8 additives, small reductions in surface tension are achieved, but no differences in contact angle are observed. All nanolubricants and base oil exhibit Newtonian behavior.
Concerning the tribological behavior, reductions in the friction coefficient are achieved for both types of nanoparticles, with the largest reductions comparing to PAO8 base oil being 13 % and 10 % for nanolubricants containing 0.05 wt% CaCO3 and 0.10 wt% CeF3 nanoparticles (NPs), respectively. In terms of antiwear performance, maximum reductions are obtained for the CaCO3 nanolubricant of 28 % (0.15 wt%), 41 % (0.10 wt%)
and 59 % (0.15 wt%) and for the CeF3 nanolubricant of 19 % (0.20 wt%), 53 % (0.10 wt%) and 58 % (0.20 wt%) for the parameters of diameter, depth, and area of the worn track, respectively. Through Raman microscopy, the tribological mechanisms of tribofilm formation, repairing, and rolling can be proposed. A discontinuous tribofilm formed by the CaCO3 and CeF3 nanoparticles reduces the contact area between the two surfaces protecting them.
2024-01-30T12:43:22Z
2024-01-30T12:43:22Z
2024-01-30T12:43:22Z
2023-09
journal article
José M. Liñeira del Río, Alonso Alba, María J.G. Guimarey, Jose I. Prado, Alfredo Amigo, Josefa Fernández, Surface tension, wettability and tribological properties of a low viscosity oil using CaCO3 and CeF3 nanoparticles as additives, Journal of Molecular Liquids, Volume 391, Part A, 2023, 123188, https://doi.org/10.1016/j.molliq.2023.123188.
0167-7322
http://hdl.handle.net/10347/32108
10.1016/j.molliq.2023.123188
1873-3166
eng
https://www.sciencedirect.com/science/article/pii/S0167732223019943
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
CC BY-NC-ND 4.0
Elsevier
oai:minerva.usc.es:10347/240692021-01-09T03:09:35Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2904com_10347_2890col_10347_10699col_10347_12265
Modeling of the Production of Lipid Microparticles Using PGSS® Technique
López Iglesias, Clara
López Iglesias, Enriqueta
Fernández Pérez, Josefa
Landín Pérez, Mariana
García González, Carlos Alberto
Universidade de Santiago de Compostela. Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Lipid microparticles
PGSS®
Supercritical CO2
Modeling
Solvent-free technology
Solid lipid microparticles (SLMPs) are attractive carriers as delivery systems as they are stable, easy to manufacture and can provide controlled release of bioactive agents and increase their efficacy and/or safety. Particles from Gas-Saturated Solutions (PGSS®) technique is a solvent-free technology to produce SLMPs, which involves the use of supercritical CO2 (scCO2) at mild pressures and temperatures for the melting of lipids and atomization into particles. The determination of the key processing variables is crucial in PGSS® technique to obtain reliable and reproducible microparticles, therefore the modelling of SLMPs production process and variables control are of great interest to obtain quality therapeutic systems. In this work, the melting point depression of a commercial lipid (glyceryl monostearate, GMS) under compressed CO2 was studied using view cell experiments. Based on an unconstrained D-optimal design for three variables (nozzle diameter, temperature and pressure), SLMPs were produced using the PGSS® technique. The yield of production was registered and the particles characterized in terms of particle size distribution. Variable modeling was carried out using artificial neural networks and fuzzy logic integrated into neurofuzzy software. Modeling results highlight the main effect of temperature to tune the mean diameter SLMPs, whereas the pressure-nozzle diameter interaction is the main responsible in the SLMPs size distribution and in the PGSS® production yield
2020-12-17T13:05:40Z
2020-12-17T13:05:40Z
2020-12-17T13:05:40Z
2020
journal article
López-Iglesias, C.; López, E.R.; Fernández, J.; Landin, M.; García-González, C.A. Modeling of the Production of Lipid Microparticles Using PGSS® Technique. Molecules 2020, 25, 4927
http://hdl.handle.net/10347/24069
10.3390/molecules25214927
1420-3049
eng
https://doi.org/10.3390/molecules25214927
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/227512020-06-02T02:01:15Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Fermiology and electron dynamics of trilayer nickelate La4Ni3O10
Li, Haoxiang
Zhou, Xiaoqing
Nummy, Thomas
Zhang, Junjie
Pardo Castro, Víctor
Pickett, Warren E.
Mitchell, J.F.
Dessau, D.S.
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Instituto de Investigacións Tecnolóxicas
Electronic properties and materials
Superconducting properties and materials
Layered nickelates have the potential for exotic physics similar to high TC superconducting cuprates as they have similar crystal structures and these transition metals are neighbors in the periodic table. Here we present an angle-resolved photoemission spectroscopy (ARPES) study of the trilayer nickelate La4Ni3O10 revealing its electronic structure and correlations, finding strong resemblances to the cuprates as well as a few key differences. We find a large hole Fermi surface that closely resembles the Fermi surface of optimally hole-doped cuprates, including its dx2−y2 orbital character, hole filling level, and strength of electronic correlations. However, in contrast to cuprates, La4Ni3O10 has no pseudogap in the dx2−y2 band, while it has an extra band of principally d3z2−r2 orbital character, which presents a low temperature energy gap. These aspects drive the nickelate physics, with the differences from the cuprate electronic structure potentially shedding light on the origin of superconductivity in the cuprates.
2020-06-01T22:03:16Z
2020-06-01T22:03:16Z
2020-06-01T22:03:16Z
2017
journal article
Li, H., Zhou, X., Nummy, T. et al. Fermiology and electron dynamics of trilayer nickelate La4Ni3O10. Nat Commun 8, 704 (2017). https://doi.org/10.1038/s41467-017-00777-0
http://hdl.handle.net/10347/22751
10.1038/s41467-017-00777-0
2041-1723
eng
https://doi.org/10.1038/s41467-017-00777-0
http://creativecommons.org/licenses/by/4.0/.
open access
© The Author(s) 2017. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Nature Publishing Group
oai:minerva.usc.es:10347/275222022-02-10T03:02:38Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Tribological properties of graphene nanoplatelets or boron nitride nanoparticles as additives of a polyalphaolefin base oil
Liñeira del Río, José Manuel
López, Enriqueta R.
Fernández Pérez, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Polyalphaolefin
Nanoadditives
Stability
Friction
Wear
In this work, antifriction and antiwear capabilities of hexagonal boron nitride nanoparticles (h-BN) or graphene nanoplatelets (GnP) as additives of a polyalphaolefin neat oil (PAO 40) were studied at pure sliding conditions. For this purpose, eight PAO 40 nanodispersions were prepared: four nanodispersions with h-BN and four others based on GnP. The mass concentrations of these dispersions are 0.25, 0.50, 0.75 and 1.00 wt% of h-BN and 0.05, 0.10. 0.25 and 0.50 wt% of GnP, having all of them a good stability against sedimentation (at least 96 h). Tribological assays were carried with prepared nanolubricants as well as with PAO 40 base oil at 20 N load. All nanolubricants based on h-BN or GnP showed lower friction coefficients in comparison to the non-additivated neat oil, with a maximum decrease in friction of 21% for the 0.50 wt% GnP nanodispersion. Regarding the produced wear, all disks lubricated with nanolubricants showed lower wear than those lubricated using PAO 40. The greatest wear reduction in wear track width (22%) was also achieved for the 0.50 wt% in GnP nanolubricant. Moreover, through the confocal Raman microscopy and roughness analyses of worn disks it can be concluded that the wear reductions are due to the surface repairing and tribofilm formation mechanisms
2022-02-09T11:22:00Z
2022-02-09T11:22:00Z
2022-02-09T11:22:00Z
2021
journal article
Journal of Molecular Liquids 333 (2021) 115911
http://hdl.handle.net/10347/27522
10.1016/j.molliq.2021.115911
0167-7322/
eng
https://doi.org/10.1016/j.molliq.2021.115911
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2021 Elsevier B.V. This work is licenced under a CC licence CC BY (https://creativecommons.org/licenses/by/4.0/)
Elsevier
oai:minerva.usc.es:10347/215362020-04-21T02:01:31Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2987com_10347_2889col_10347_10699col_10347_20441
Event-by-event mean pT fluctuations in pp and Pb–Pb collisions at the LHC
ALICE Collaboration
Armesto Pérez, Néstor
González Ferreiro, Elena
Pajares Vales, Carlos
Salgado López, Carlos Alberto
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE)
Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at s√ = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN= 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.
2020-04-20T08:48:44Z
2020-04-20T08:48:44Z
2020-04-20T08:48:44Z
2014
journal article
Abelev, B., Adam, J., Adamová, D. et al. Event-by-event mean ppT fluctuations in pp and Pb–Pb collisions at the LHC. Eur. Phys. J. C 74, 3077 (2014). https://doi.org/10.1140/epjc/s10052-014-3077-y
1434-6044
http://hdl.handle.net/10347/21536
10.1140/epjc/s10052-014-3077-y
1464-6052
eng
https://doi.org/10.1140/epjc/s10052-014-3077-y
https://creativecommons.org/licenses/by/4.0/
open access
© CERN for the benefit of the ALICE collaboration 2014. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0.
Springer
oai:minerva.usc.es:10347/184342020-01-31T13:21:49Zcom_10347_2918com_10347_2891com_10347_2888com_10347_227com_10347_2919col_10347_13951col_10347_10699
A cota de erro na medida das audiencias
Mira Pérez, Jorge
Sánchez Sellero, César Andrés
Universidade de Santiago de Compostela. Departamento de Estatística, Análise Matemática e Optimización
Universidade de Santiago de Compostela. Departamento de Física Aplicada
2019-03-21T12:21:32Z
2019-03-21T12:21:32Z
2019-03-21T12:21:32Z
2008
journal article
Mira Pérez, J. e Sánchez Sellero, C.A. (2008). A cota de erro na medida das audiencias. Papeis da Academia Galega do Audiovisual. Nº 2, pp. 72-73
1888-1912
D.L. C. 3485–2007
http://hdl.handle.net/10347/18434
glg
https://www.academiagalegadoaudiovisual.gal/wp-content/uploads/2008/12/Anuario-2007-2008.pdf
open access
© 2008 Academia Galega do Audiovisual
Academia Galega do Audiovisual
oai:minerva.usc.es:10347/319182024-01-20T01:02:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Científicas e inventoras a través de los cuentos
Calvo Iglesias, Encina
Universidade de Santiago de Compostela. Departamento de Física Aplicada
cuentos
estereotipos de género
igualdad
ciencia y tecnología
educación primaria
tales
gender stereotypes
equality
science and technology
primary education
En los últimos años, en nuestro país se han llevado a
cabo distintas iniciativas para atraer alumnas al ámbito STEM
(Science, Technology, Engineering and Mathematics), donde
continúan siendo una minoría. En esta comunicación, mostramos
una selección de científicas e inventoras cuyas biografías
aparecen en cuentos y relatos dirigidos al público infantil y juvenil
y que ha formado parte del material complementario del
programa Unha enxeñeira ou científica en cada cole, cuyo objetivo
es visibilizar a científicas y tecnólogas en colegios de primaria.
Estos cuentos y relatos podrían utilizarse para mostrar las
contribuciones de las mujeres al avance de la ciencia y tecnología,
combatiendo la cultura androcéntrica que aún predomina en los
libros de texto escolares y proporcionando referentes femeninos
en el ámbito científico-tecnológico, algo de gran importancia en
la elección de estudios.
In recent years, different initiatives have been carried out in our country to attract girls to the STEM disciplines (Science, Technology, Engineering and Mathematics), where they continue to be a minority. In this communication, we show a selection of female scientists and inventors whose biographies appear in tales and stories aimed at children and young people, and have been part of the complementary material of the program Unha enxeñeira ou científica en cada cole, whose objective is to make female scientists and technologists visible in primary schools. These stories and tales could be used to show the contributions of women to the advancement of science and technology, fighting the androcentric culture that still predominates in school textbooks and providing feminine references in the scientifictechnological field, something of great importance in the choice of studies.
2024-01-19T13:45:07Z
2024-01-19T13:45:07Z
2024-01-19T13:45:07Z
2019
journal article
Calvo-Iglesias, Encina (2019). Científicas e inventoras a través de los cuentos. IQUAL, 2, 147-170. https://doi.org/10.6018/iqual.340701
2603-851X
http://hdl.handle.net/10347/31918
10.6018/iqual.340701
spa
https://doi.org/10.6018/iQual.340701
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Universidad de Murcia
oai:minerva.usc.es:10347/271292023-07-10T06:10:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Electrochemically exfoliated graphene and molybdenum disulfide nanoplatelets as lubricant additives
García Guimarey, María Jesús
Viesca Rodríguez, José Luis
Abdelkader, Amr
thomas, ben
Hernández Battez, Antolin
Hadfield, Mark
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Graphene nanoplatelets
Molybdenum disulfide nanoplatelets
Additives
Engine oil
Friction
Wear
In this work, two different 2D materials, molybdenum disulfide nanoplatelets (MSNP) and graphene nanoplatelets (GNP), prepared by electrochemical exfoliation, were used as additives to prepare nanolubricants. The tribological behaviour of the nanolubricants was evaluated under two configurations (pure sliding and rolling/sliding) using two different tribometers: an Universal Macro Materials Tester (UMT-3) and a Mini Traction Machine (MTM2). Wear volume was determined, after the sliding tests, in a confocal microscope (Leica DCM 3D) and the worn surface was analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Raman microscopy. Lubrication mechanisms of GNP and MSNP dispersed in an engine oil for improving its antifriction and antiwear capabilities are proposed. The traction coefficient determination was performed at a 50% of slide-to-roll ratio and at different temperatures. The results showed that the nanolubricants formulated with both types of additives, in their lowest concentration, improved friction and wear in sliding tests, compared to neat engine oil. In addition, only the nanolubricants with the MSNP nano additive at loadings of 0.05 and 0.2 wt% showed friction reductions compared to the commercial engine oil under the rolling/sliding test
2021-11-23T11:39:19Z
2021-11-23T11:39:19Z
2021-11-23T11:39:19Z
2021
journal article
Journal of Molecular Liquids 342 (2021) 116959
0167-7322
http://hdl.handle.net/10347/27129
10.1016/j.molliq.2021.116959
eng
https://doi.org/10.1016/j.molliq.2021.116959
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-86425-C2-2-R/ES/LUBRICANTES BASADOS EN NANOADITIVOS AVANZADOS PARA ENGRANAJES Y MOTORES
http://creativecommons.org/licenses/by/4.0/
open access
©2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/312642024-02-16T13:06:44Zcom_10347_2953com_10347_2893com_10347_2888com_10347_227com_10347_2919com_10347_2891col_10347_15488col_10347_10699
Quantification of temporomandibular joint space in patients with juvenile idiopathic arthritis assessed by cone beam computerized tomography
Otero, María Florinda
Tahoces, Pablo G.
Mera, Antonio
Dalstra, Michel
Verna, Carlalberta
Pedersen, Thomas Klit
Herlin, Troels
Mira, Jorge
Universidade de Santiago de Compostela. Departamento de Electrónica e Computación
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Cone-beam computed tomography
Imaging
Inflammation
Juvenile idiopathic arthritis
TMJ
Objective
To describe a method to calculate the total intra-articular volume (inter-osseous space) of the temporomandibular joint (TMJ) determined by cone-beam computed tomography (CBCT). This could be used as a marker of tissue proliferation and different degrees of soft tissue hyperplasia in juvenile idiopathic arthritis (JIA) patients.
Materials and Methods
Axial single-slice CBCT images of cross-sections of the TMJs of 11 JIA patients and 11 controls were employed. From the top of the glenoid fossa, in the caudal direction, an average of 26 slices were defined in each joint (N = 44). The interosseous space was manually delimited from each slice by using dedicated software that includes a graphic interface. TMJ volumes were calculated by adding the areas measured in each slice. Two volumes were defined: Ve−i and Vi, where Ve−i is the inter-osseous space, volume defined by the borders of the fossa and Vi is the internal volume defined by the condyle. An intra-articular volume filling index (IF) was defined as Ve−i/Vi, which represents the filling of the space.
Results
The measured space of the intra-articular volume, corresponding to the intra-articular soft tissue and synovial fluid, was more than twice as large in the JIA group as in the control group.
Conclusion
The presented method, based on CBCT, is feasible for assessing inter-osseus joint volume of the TMJ and delimits a threshold of intra-articular changes related to intra-articular soft tissue proliferation, based on differences in volumes. Intra-articular soft tissue is found to be enlarged in JIA patients
2023-11-13T11:01:30Z
2023-11-13T11:01:30Z
2023-11-13T11:01:30Z
2023-08-01
journal article
Orthod Craniofac Res. 2023;00:1-8
1601-6335
http://hdl.handle.net/10347/31264
10.1111/ocr.12702
1601-6343
eng
https://doi.org/10.1111/ocr.12702
http://creativecommons.org/licenses/by-nc/4.0/
open access
© 2023 The Authors. Orthodontics & Craniofacial Research published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes
Atribución-NoComercial 4.0 Internacional
Wiley
oai:minerva.usc.es:10347/272952023-07-10T06:10:56Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Accuracy of refractive index spectroscopy by broadband interferometry
Arosa Lobato, Yago
Rodríguez-Fernández, Carlos Damián
Doval Casas, Alejandro
López Lago, Elena
Fuente Carballo, Raúl de la
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Dispersion
Spectroscopy
Spectral interferometry
Uncertainty
Uncertainties of refractive and group index in dispersion measurement by spectrally resolved white light interferometry are deeply analyzed. First, the contribution to uncertainty of the different parameters affecting both indices is identified. Afterwards, results are presented for a 1.5 mm thick fused silica sample over a broad spectral range, from 400 to 1000 nm, and the effects that mostly deteriorate the measurement accuracy are established. Finally, the different contributions are quadratically combined to determine the total uncertainty of the two indices
2021-12-28T11:55:01Z
2021-12-28T11:55:01Z
2021-12-28T11:55:01Z
2022
journal article
Measurement 187 (2022) 110225
http://hdl.handle.net/10347/27295
10.1016/j.measurement.2021.110225
0263-2241
eng
https://doi.org/10.1016/j.measurement.2021.110225
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2017-89239-C2-1-P/ES/MATERIALES INTELIGENTES PARA LOS RETOS ELECTROQUIMICOS Y FOTONICOS: LIQUIDOS IONICOS E IONOGELES HIBRIDOS
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/267262023-07-10T06:10:59Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Heat capacity, density, surface tension, and contact angle for polyalphaolefins and ester lubricants
Coelho de Sousa Marques, Mónica Alexandra
García Guimarey, María Jesús
Domínguez Arca, Vicente
Amigo Pombo, Alfredo José
Fernández Pérez, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Polyalphaolefins
Ester-based lubricants
Thermophysical and surface properties
Wetting behaviour
Thermophysical properties of lubricants are important to understand which ones are appropriated for the industrial conditions expected. Thermophysical properties of two different families of lubricants were analysed: polyalphaolefins (PAO6, PAO20, PAO32 and PAO40) and four ester-based lubricants. Specific heat capacity, density, surface tension, and contact angle were experimentally determined over a broad temperature range through methods such as μDSC, U-tube vibration, drop volume, and sessile drop method, respectively. A clear difference between the two families was observed due to their structure and composition, grouping by nature. Ester-based lubricants showed lower specific heat capacity but higher surface tension and density than polyalphaolefins. PAO6 clearly has the lowest density and surface tension and presents the highest specific heat capacity of all lubricants, and together with trimethylolpropane trioleate, TMPTO, presents the best wettability. Heat capacity values were used to test the validity of two predictive methods
2021-08-09T11:45:00Z
2021-08-09T11:45:00Z
2021-08-09T11:45:00Z
2021
journal article
Thermochimica Acta 2021, 703: 178994. https://doi.org/10.1016/j.tca.2021.178994
0040-6031
http://hdl.handle.net/10347/26726
10.1016/j.tca.2021.178994
eng
https://doi.org/10.1016/j.tca.2021.178994
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/ENE2017-86425-C2-2-R/ES/LUBRICANTES BASADOS EN NANOADITIVOS AVANZADOS PARA ENGRANAJES Y MOTORES
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/238272021-01-09T03:02:58Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Efficient Separation of Heavy Metals by Magnetic Nanostructured Beads
Castro Alves, Lisandra de
Yáñez Vilar, Susana
Piñeiro Redondo, Yolanda
Rivas Rey, José
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Heavy metals
Magnetite nanoparticles
Adsorption
Nanocomposite
Hybrid
Multi-metal
Water
This study reports the ability of magnetic alginate activated carbon (MAAC) beads to remove Cd(II), Hg(II), and Ni(II) from water in a mono-metal and ternary system. The adsorption capacity of the MAAC beads was highest in the mono-metal system. The removal efficiency of such metal ions falls in the range of 20–80% and it followed the order Cd(II) > Ni(II) > Hg(II). The model that best fitted in the ternary system was the Freundlich isotherm, while in the mono-system it was the Langmuir isotherm. The maximum Cd(II), Hg(II), and Ni(II) adsorption capacities calculated from the Freundlich isotherm in the mono-metal system were 7.09, 5.08, and 4.82 (mg/g) (mg/L)1/n, respectively. Lower adsorption capacity was observed in the ternary system due to the competition of metal ions for available adsorption sites. Desorption and reusability experiments demonstrated the MAAC beads could be used for at least five consecutive adsorption/desorption cycles. These findings suggest the practical use of the MAAC beads as efficient adsorbent for the removal of heavy metals from wastewater
2020-11-26T12:25:04Z
2020-11-26T12:25:04Z
2020-11-26T12:25:04Z
2020
journal article
de Castro Alves, L.; Yáñez-Vilar, S.; Piñeiro-Redondo, Y.; Rivas, J. Efficient Separation of Heavy Metals by Magnetic Nanostructured Beads. Inorganics 2020, 8, 40
http://hdl.handle.net/10347/23827
10.3390/inorganics8060040
2304-6740
eng
https://doi.org/10.3390/inorganics8060040
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
MDPI
oai:minerva.usc.es:10347/273112021-12-31T03:02:25Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Astigmatism in the basic Offner spectrometer
González Núñez, Héctor
Montero Orille, Carlos
Fuente Carballo, Raúl de la
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Offner spectrometer
Rowland configuration
Concentric systems
Astigmatism
Optical system design
The in-plane configuration of the basic Offner spectrometer is revised. The locations of meridional and sagittal images of the slit center are analyzed when the slit is displaced in the axial direction from the usual configuration, whereas its center is kept on the Rowland circle of the concave mirror. This translates the position of the sagittal image plane and allows for the cancellation of astigmatism and meridional coma for two wavelengths while these aberrations are kept small over the whole spectral range. This is accomplished without splitting the concave mirror into two different mirrors, simplifying the design and its practical implementation. A design example is presented with excellent optical performance
2021-12-30T13:04:59Z
2021-12-30T13:04:59Z
2021-12-30T13:04:59Z
2021
journal article
Optik 247 (2021) 167873
http://hdl.handle.net/10347/27311
10.1016/j.ijleo.2021.167873
0030-4026
eng
https://doi.org/10.1016/j.ijleo.2021.167873
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2021 The Author(s). Published by Elsevier GmbH. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/326792024-02-10T01:03:41Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Ellas nos llevaron al espacio
Lorenzo González, María de las Nieves
Calvo Iglesias, Encina
Álvarez Fernández, Inés
Universidade de Santiago de Compostela. Departamento de Física Aplicada
CTIM
Igualdad de género
Mujeres científicas
Mujeres ingenieras
STEM
Gender Equality
Women scientist
Women engineers
In this article we present the biographies of some of the women who have contributed to space exploration. A work that has been invisibilized for a long time, but fortunately this year 2021 "Women in Space" has been the theme of the World Space Week with the purpose of making visible the achievements and contributions of women to the space sector and the sciences. In the same vein, this article aims on the one hand to recover the pioneers and on the other to encourage the interest of our young women in science, offering them mirrors in which to look at themselves.
En este artículo, presentamos las biografías de algunas de las mujeres que han contribuido a la exploración espacial. Un trabajo que ha permanecido oculto durante mucho tiempo. Afortunadamente, este año 2021 "La mujer en el espacio" ha sido el lema de la Semana Mundial del Espacio, con el propósito de visibilizar los logros y contribuciones de las mujeres al sector espacial y las ciencias. En la misma línea, este artículo pretende por un lado recuperar a las pioneras y por otro fomentar el interés de nuestras jóvenes por las ciencias, ofreciéndoles espejos en los que mirarse
2024-02-09T12:49:15Z
2024-02-09T12:49:15Z
2024-02-09T12:49:15Z
2022-03-31
journal article
Lorenzo-González, MDLN.; Calvo-Iglesias, E.; Ávarez-Fernández, I. (2022). Ellas nos llevaron al espacio. Ciencia, Técnica y Mainstreaming Social. (6):33-42. https://doi.org/10.4995/citecma.2022.16570
http://hdl.handle.net/10347/32679
10.4995/CITECMA.2022.16570
2530-7924
spa
https://doi.org/10.4995/citecma.2022.16570
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
Editorial Universitat Politècnica de València
oai:minerva.usc.es:10347/242352023-07-10T06:18:01Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Exploiting Unique Alignment of Cobalt Ferrite Nanoparticles, Mild Hyperthermia, and Controlled Intrinsic Cobalt Toxicity for Cancer Therapy
Balakrishnan, Preethi Bala
Silvestri, Niccolò
Fernández Cabada, Tamara
Marinano, Federica
Fernandes, Soraia
Fiorito, Sergio
Miscuglio, Mario
Serantes Abalo, David
Ruta, Sergiu
Livesey, Karen L.
Hovorka, Ondrej
Chantrell, Roy W.
Pellegrino, Teresa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Cancer therapy
Cobalt ferrite nanoparticles
Cobalt toxicity
Magnetic hyperthermia
Particle alignment
Nanoparticle‐based magnetic hyperthermia is a well‐known thermal therapy platform studied to treat solid tumors, but its use for monotherapy is limited due to incomplete tumor eradication at hyperthermia temperature (45 °C). It is often combined with chemotherapy for obtaining a more effective therapeutic outcome. Cubic‐shaped cobalt ferrite nanoparticles (Co–Fe NCs) serve as magnetic hyperthermia agents and as a cytotoxic agent due to the known cobalt ion toxicity, allowing the achievement of both heat and cytotoxic effects from a single platform. In addition to this advantage, Co–Fe NCs have the unique ability to form growing chains under an alternating magnetic field (AMF). This unique chain formation, along with the mild hyperthermia and intrinsic cobalt toxicity, leads to complete tumor regression and improved overall survival in an in vivo murine xenograft model, all under clinically approved AMF conditions. Numerical calculations identify magnetic anisotropy as the main Co–Fe NCs’ feature to generate such chain formations. This novel combination therapy can improve the effects of magnetic hyperthermia, inaugurating investigation of mechanical behaviors of nanoparticles under AMF, as a new avenue for cancer therapy
2021-01-19T12:49:32Z
2021-01-19T12:49:32Z
2021-01-19T12:49:32Z
2020
journal article
Balakrishnan, P. B., Silvestri, N., Fernandez‐Cabada, T., Marinaro, F., Fernandes, S., Fiorito, S., Miscuglio, M., Serantes, D., Ruta, S., Livesey, K., Hovorka, O., Chantrell, R., Pellegrino, T., Exploiting Unique Alignment of Cobalt Ferrite Nanoparticles, Mild Hyperthermia, and Controlled Intrinsic Cobalt Toxicity for Cancer Therapy. Adv. Mater. 2020, 32, 2003712. https://doi.org/10.1002/adma.202003712
http://hdl.handle.net/10347/24235
10.1002/adma.202003712
1521-4095
eng
https://doi.org/10.1002/adma.202003712
info:eu-repo/grantAgreement/EC/H2020/678109
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 The Authors. Published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Atribución 4.0 Internacional
Wiley
oai:minerva.usc.es:10347/184052020-01-31T14:31:49Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Coexistence of magnetic and electrical order in the new perovskite-like (C3N2H5)[Mn(HCOO)3] formate
Pato Doldán, Breogán
Gómez Aguirre, Lilián Claudia
Bermúdez García, Juan Manuel
Sánchez Andújar, Manuel
Fondado Fondado, Alfonso
Mira Pérez, Jorge
Castro García, Socorro
Señarís Rodríguez, María Antonia
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Metal–organic framework
Perovskite-like structure
Magnetic properties
Dielectric properties
Thermal energy
Multiferroic material
In this work we further the structural characterization of the recently discovered (C3N2H5)[Mn(HCOO)3] metal–organic framework with perovskite-like structure, and we present its magnetic and dielectric properties up to 350 K. At low temperature, the C3N2H5+ imidazolium cations, that sit oblique within the cavities of the [Mn(HCOO)3]− framework structure, show a cooperative order resulting in an antiparallel arrangement of their electrical dipole moments. Very interestingly, it is only above 220 K that thermal energy seems to be able to break this antiferroelectric order, resulting in a linear increase of its dielectric constant with temperature. In addition, this Mn(II) compound is antiferromagnetic below TN = 9 K, with a slightly non-collinear arrangement of its magnetic moments, yielding to a weak ferromagnetism. Therefore, this is a new multiferroic material which exhibits coexistence of magnetic and electric ordering
2019-03-18T12:39:56Z
2019-03-18T12:39:56Z
2019-03-18T12:39:56Z
2013
journal article
Pato-Doldán, B., Gómez-Aguirre, L., Bermúdez-García, J., Sánchez-Andújar, M., Fondado, A., & Mira, J. et al. (2013). Coexistence of magnetic and electrical order in the new perovskite-like (C3N2H5)[Mn(HCOO)3] formate. RSC Advances, 3(44), 22404. doi: 10.1039/c3ra43165g
http://hdl.handle.net/10347/18405
10.1039/C3RA43165G
2046-2069
eng
http://dx.doi.org/10.1039/c3ra43165g
open access
© The Royal Society of Chemistry 2013
Royal Society of Chemistry
oai:minerva.usc.es:10347/301942023-02-23T03:02:57Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Quantum projectors implemented with optical directional couplers in ion-exchanged glasses
Prieto Blanco, Xesús
Montero Orille, Carlos
Liñares Beiras, Jesús
González Núñez, Héctor
Balado Souto, Daniel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Integrated quantum passive elements
Integrated quantum projective meters
Ion-exchanged glass platform
Ion-exchanged glass as a platform for quantum photonics is proposed. Quantum projectors are implemented with
integrated optical directional couplers fabricated by ion-exchange
K+/Na+ in soda-lime glass. We consider devices composed of concatenated directional couplers which implement N-dimensional
quantum projective measurements, and concomitantly the production of 1-qudit states. The fundamental units of these devices are 2
× 2 directional couplers that are experimentally studied in order
to obtain, through an optical characterization, empiric relationships between fabrication and optical parameters of such couplers.
Likewise, a two-dimensional quantum projector is demonstrated so
that projective measurements are obtained for the states of bases
X (diagonal) and Y (circular)
2023-02-22T13:19:59Z
2023-02-22T13:19:59Z
2023-02-22T13:19:59Z
2022
journal article
X. Prieto-Blanco, C. Montero-Orille, J. Liñares, H. González-Núñez and D. Balado, "Quantum Projectors Implemented With Optical Directional Couplers in Ion-Exchanged Glasses," in Journal of Lightwave Technology, vol. 40, no. 23, pp. 7676-7684, 1 Dec.1, 2022, doi: 10.1109/JLT.2022.3189206
0733-8724
http://hdl.handle.net/10347/30194
10.1109/JLT.2022.3189206
1558-2213
eng
https://doi.org/10.1109/JLT.2022.3189206
http://creativecommons.org/licenses/by/4.0/
open access
This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
Atribución 4.0 Internacional
IEEE
oai:minerva.usc.es:10347/186382020-01-31T09:03:19Zcom_10347_2918com_10347_2891com_10347_2888com_10347_227com_10347_2919col_10347_13951col_10347_10699
The importance of interlinguistic similarity and stable bilingualism when two languages compete
Mira Pérez, Jorge
Seoane, Luis F.
Nieto Roig, Juan José
Universidade de Santiago de Compostela. Departamento de Análise Matemática
Universidade de Santiago de Compostela. Departamento de Física Aplicada
One approach for analyzing the dynamics of two languages in
competition is to fit historical data for the number of speakers of each with a
mathematical model in which the parameters are interpreted as the similarity
between those languages and their relative status. Within this approach, on the
basis of a detailed analysis and extensive calculations, we show the outcomes that
can emerge for given values of these parameters. In contrast to previous results,
it is possible that in the long term both languages may coexist and survive. This
happens only where there is a stable bilingual group, and this is possible only if
the competing languages are sufficiently similar, in which case its occurrence is
favoured by both similarity and status symmetry
2019-04-17T07:17:41Z
2019-04-17T07:17:41Z
2019-04-17T07:17:41Z
2011
journal article
Mira, J., Seoane, L., & Nieto, J. (2011). The importance of interlinguistic similarity and stable bilingualism when two languages compete. New Journal Of Physics, 13, 033007. doi: 10.1088/1367-2630/13/3/033007
1367-2630
http://hdl.handle.net/10347/18638
10.1088/1367-2630/13/3/033007
1367-2630
eng
https://doi.org/10.1088/1367-2630/13/3/033007
https://creativecommons.org/licenses/by/3.0/
open access
© IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. This work is published under a Creative Commons Attribution (CC BY) license
IOP Publishing
oai:minerva.usc.es:10347/248052021-03-18T03:01:25Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Jacobi–Fourier phase mask for wavefront coding
González Amador, Enrique
Padilla Vivanco, Alfonso
Toxqui Quitl, Carina
Arines Piferrer, Justo
Acosta Plaza, Eva María
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Computational imaging
Image reconstruction
Wavefront encoding
In this work we propose Jacobi–Fourier phase masks for wavefront coding-based imaging systems. The optical properties of the phase mask is study in detail and numerical simulation are shown. Pixel size and noise are taken into account for the deconvolution of images. Numerical simulations indicate that overall performance is better than of the well-known and commonly used trefoil phase
2021-03-17T12:35:40Z
2021-03-17T12:35:40Z
2021-03-17T12:35:40Z
2020
journal article
Optics and Lasers in Engineering, 126 (2020), 105880
0143-8166
http://hdl.handle.net/10347/24805
10.1016/j.optlaseng.2019.105880
eng
https://doi.org/10.1016/j.optlaseng.2019.105880
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Elsevier
oai:minerva.usc.es:10347/213622020-04-15T02:01:41Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Mode-division multiplexed transmission with inline few-mode fiber amplifier
Bai, Neng
Ip, Ezra
Huang, Yue-Kai
Mateo, Eduardo
Yaman, Fatih
Li, Ming-Jun
Bickham, Scott
Ten, Sergey
Liñares Beiras, Jesús
Montero Orille, Carlos
Moreno de las Cuevas, Vicente
Prieto Blanco, Xesús
Tse, Vicent
Chung, Kit Man
Lau, Alan Pak Tao
Tam, Hwa-Yaw
Lu, Chao
Peng, Gang-Ding
Li, Guifang
Wang, Ting
Universidade de Santiago de Compostela. Departamento de Física Aplicada
We demonstrate mode-division multiplexed WDM transmission over 50-km of few-mode fiber using the fiber’s LP01 and two degenerate LP11 modes. A few-mode EDFA is used to boost the power of the output signal before a few-mode coherent receiver. A 6×6 time-domain MIMO equalizer is used to recover the transmitted data. We also experimentally characterize the 50-km few-mode fiber and the few-mode EDFA
2020-04-14T13:54:23Z
2020-04-14T13:54:23Z
2020-04-14T13:54:23Z
2012
journal article
Neng Bai, Ezra Ip, Yue-Kai Huang, Eduardo Mateo, Fatih Yaman, Ming-Jun Li, Scott Bickham, Sergey Ten, Jesús Liñares, Carlos Montero, Vicente Moreno, Xesús Prieto, Vincent Tse, Kit Man Chung, Alan Pak Tao Lau, Hwa-Yaw Tam, Chao Lu, Yanhua Luo, Gang-Ding Peng, Guifang Li, and Ting Wang, "Mode-division multiplexed transmission with inline few-mode fiber amplifier," Opt. Express 20, 2668-2680 (2012)
http://hdl.handle.net/10347/21362
10.1364/OE.20.002668
1094-4087
eng
https://doi.org/10.1364/OE.20.002668
open access
© 2012 Optical Society of America
Optical Society of America
oai:minerva.usc.es:10347/188272020-01-31T14:27:38Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
El genio español que comprendió la caída libre de los cuerpos y anticipó el concepto de masas: Domingo Soto
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Física
Caída libre
Masa
Domingo de Soto
Galileo Galilei
Physics
Free fall
Mass
La figura de Domingo de Soto es relevante en la Iglesia del siglo XVI, pero lo que no es tan conocido son sus
contribuciones pioneras a la física. Sus acertadas reflexiones sobre la caída libre de los cuerpos y el concepto
de masa aportaron un cambio cualitativo, que pudo haber influido más tarde en el pensamiento de grandes
figuras de la historia de la ciencia
The figure of Domingo de Soto is relevant in the Church of the XVI century, but what is not so well known are
his pioneering contributions to physics. His accurate reflections on the free fall of bodies and the concept of
mass contributed to a qualitative change, which could have later influenced the thinking of great figures in
the history of science
2019-05-27T09:02:53Z
2019-05-27T09:02:53Z
2019-05-27T09:02:53Z
2018
journal article
Mira Pérez, J. (2018). El genio español que comprendió la caída libre de los cuerpos y anticipó el concepto de masas: Domingo Soto. Liceo Franciscano. Año LXVIII, nº 210 (Enero-Junio 2018), pp. 47-53
0211-4011
D.L. C. 755-2003
http://hdl.handle.net/10347/18827
2530-917X
spa
https://www.liceofranciscano.es/es/bibliografia/48_el-genio-espanol-que-comprendio-la-caida-libre-de-los-cuerpos-y-anticipo-el-concepto-de-masa--domingo-de-soto.htm
open access
© El Eco Franciscano, 2018
El Eco Franciscano
oai:minerva.usc.es:10347/184152020-01-31T14:29:37Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2925col_10347_10699col_10347_9937
¿Es generalizable la existencia de una transición de primer orden ferromagnética-paramagnética en los materiales con magnetorresistencia colosal R2/3B1/3MnO3 (R=lantanido; B=alcalinoterreo)?
Mira Pérez, Jorge
Rivas Rey, José
Rivadulla Fernández, José Francisco
López Quintela, Manuel Arturo
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
Magnetismo
Transiciones de fase
Magnetorresistencia colosal
Perovskitas
Manganitas
Magnetism
Phase transitions
Colossal magnetoresistance
Perovskites
Manganites
En este trabajo se examina la naturaleza de la transición de fase
ferromagnética de materiales de manganeso con estructura de perovskita,
de gran interés tecnológico por sus enormes variaciones de resistividad
eléctrica ante la presencia de un campo magnético aplicado
(magnetorresistencia colosal). Se encuentra que, en contra de la opinión
generalizada, no todos estos materiales presentan un comportamiento
cualitativamente similar. En concreto, el carácter de primer orden de la
transición ferromagnética no es un factor común. Las implicaciones
físicas de este resultado son discutidas
In this work, the nature of the ferromagnetic phase transition of
manganese-based materials with perovskite structure, is examined. These
are materials of great technological interest due to the enormous variations
of their electrical resistivity under the presence of an applied magnetic
field (colossal magnetoresistance). lt is found that, contrary to the
assumed belíef, not all these materials present a qualitatively similar
behaviour. Concretely, the first order character of the ferromagnetic
transition is not a common factor. The physical implications of this result
are discussed
2019-03-21T07:53:01Z
2019-03-21T07:53:01Z
2019-03-21T07:53:01Z
1998
journal article
Mira Pérez, J., Rivas Rey, J., Rivadulla, F. y López Quintela, M.A. (1998). ¿Es generalizable la existencia de una transición de primer orden ferromagnética-paramagnética en los materiales con magnetorresistencia colosal R2/3B1/3MnO3 (R=lantanido; B=alcalinoterreo)?, Revista Real Academia Galega de Ciencias. Vol. XVII, pp. 17-43
1135-5417
http://hdl.handle.net/10347/18415
spa
open access
© Real Academia Galega das Ciencias, 1998
Real Academia Galega de Ciencias
oai:minerva.usc.es:10347/279012022-04-06T02:02:38Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Charge delocalization and hyperpolarizability in ionic liquids
Rodríguez-Fernández, Carlos Damián
Varela Cabo, Luis Miguel
Schröder, Christian
López Lago, María Elena
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Ionic Liquids (ILs)
Hyperpolarizability
Non-linear Susceptibility
Second Harmonic Generation (SHG)
Electro-Optical Kerr-Effect (EOKE)
Charge delocalization
Density functional theory (DFT)
In this work the role that charge delocalization plays in the non-linear optical response of ionic liquids is evaluated. The first hyperpolarizability for the non-linear process of second harmonic generation (SHG) and second hyperpolarizability for the non-linear process of electro-optical Kerr-Effect (EOKE) of a large number of ionic liquid forming ions were estimated by means of density functional theory calculations. The results point to that both charge delocalization and molecular geometry are the key features that govern their hyperpolarizabilities. Our findings show that some of the most commonly used anions in ionic liquids are expected to present strong non-linear responses while common cations present a much more limited performance. However, this limitation can be overcome by a proper tailoring of cations to present charge delocalization over large molecular regions. The hypothesis of additivity of hyperpolarizabilities in ionic liquids is tested and exploited to obtain a map of second and third order non-linear susceptibilities of 1496 ion combinations. This map is intended to be a guide for future works on the hyperpolarizability of ILs
2022-04-05T07:18:57Z
2022-04-05T07:18:57Z
2022-04-05T07:18:57Z
2022
journal article
Journal of Molecular Liquids 349 (2022) 118153. https://doi.org/10.1016/j.molliq.2021.118153
http://hdl.handle.net/10347/27901
10.1016/j.molliq.2021.118153
0167-7322
eng
https://doi.org/10.1016/j.molliq.2021.118153
http://creativecommons.org/licenses/by/4.0/
open access
© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/327642024-02-13T02:21:26Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Diurnal variations of tear film osmolarity on the ocular surface
Pena Verdeal, Hugo
García Resúa, Carlos
García Queiruga, Jacobo
Sabucedo Villamarín, Belén
Yebra-Pimentel Vilar, Eva
Giráldez Fernández, María Jesús
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Tear film
Osmolarity
Diurnal variation
Dry eye disease
Tear osmometer
The measurement of tear film osmolarity has been suggested as a gold standard in the diagnosis of dry eye. Many tear film physiological variables oscillate during the day, therefore previous reports have studied how this variable changes throughout the day. The present brief review article will summarize the current clinical knowledge and the main conclusion of the diurnal osmolarity variation in the tear film. For this purpose, the review performs a critical analysis of sample size and characteristics, the differences in the diurnal osmolarity variation on healthy versus altered tear film conditions or environment eyes, and time of day and number of measurements done. A total of twenty-one studies where one of the main objectives was to analyse the variance of the tear film osmolar value along different time points in a day on a human cohort were compared. Osmolar tear film value does appear to be somewhat influenced by the time of day in healthy subjects and patients with ocular surface disease or altered by environmental conditions. Both, healthy and no-physiological tear film stable cohorts, showed variations in results depending on the study: no variations during the day or statistically different values at some point in the day (these differences could be in the middle of the day or between the beginning and the end of the day, with higher values in the morning than in the afternoon, or even the opposite situation). The possibility of diurnal variations in tear film osmolarity should be considered by the clinician since the time of day when the tear film measurements are made can be critical in making the right diagnosis. Future studies in the diurnal variation field may have to use a well-established range of measurement time-points and a larger group of healthy and tear film altered by pathological or environmental conditions subjects.
2024-02-12T10:35:01Z
2024-02-12T10:35:01Z
2024-02-12T10:35:01Z
2022-04-11
journal article
Hugo Pena-Verdeal, Carlos Garcia-Resua, Jacobo Garcia-Queiruga, Belen Sabucedo-Villamarin, Eva Yebra-Pimentel & Maria Jesus Giraldez (2023) Diurnal variations of tear film osmolarity on the ocular surface, Clinical and Experimental Optometry, 106:4, 351-361, DOI: 10.1080/08164622.2022.2051697
0816-4622
http://hdl.handle.net/10347/32764
10.1080/08164622.2022.2051697
1444-0938
eng
https://doi.org/10.1080/08164622.2022.2051697
open access
© Taylor and Francis
Taylor and Francis
oai:minerva.usc.es:10347/163032020-06-10T11:25:05Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Anthropogenic disruption of the night sky darkness in urban and rural areas
Bará Viñas, Salvador Xurxo
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Astronomy
Environmental monitoring
Wide-area sensing
Light pollution
Atmospheric effects
Photometry
The growing emissions of artificial light to the atmosphere
are producing, among other effects, a significant increase of
the night sky brightness (NSB) above its expected natural
values. A permanent sensor network has been deployed
in Galicia (northwest of Iberian peninsula) to monitor the
anthropogenic disruption of the night sky darkness in a
countrywide area. The network is composed of 14 detectors
integrated in automated weather stations of MeteoGalicia, the
Galician public meteorological agency. Zenithal NSB readings
are taken every minute and the results are openly available
in real time for researchers, interested stakeholders and the
public at large through a dedicated website. The measurements
allow one to assess the extent of the loss of the natural night
in urban, periurban, transition and dark rural sites, as well as
its daily and monthly time courses. Two metrics are introduced
here to characterize the disruption of the night darkness across
the year: the significant magnitude (m1/3) and the moonlight
modulation factor (γ ). The significant magnitude shows that
in clear and moonless nights the zenithal night sky in the
analysed urban settings is typically 14–23 times brighter than
expected from a nominal natural dark sky. This factor lies in the
range 7–8 in periurban sites, 1.6–2.5 in transition regions and
0.8–1.6 in rural and mountain dark sky places. The presence
of clouds in urban areas strongly enhances the amount of
scattered light, easily reaching amplification factors in excess
of 25, in comparison with the light scattered in the same places
under clear sky conditions. The periodic NSB modulation due
to the Moon, still clearly visible in transition and rural places,
is barely notable at periurban locations and is practically lost at
urban sites
2018-01-11T12:19:12Z
2018-01-11T12:19:12Z
2018-01-11T12:19:12Z
2016-10-19
journal article
Bará S. 2016 Anthropogenic disruption of the night sky darkness in urban and rural areas.R. Soc. open sci.3: 160541. http://dx.doi.org/10.1098/rsos.160541
2054-5703
http://hdl.handle.net/10347/16303
10.1098/rsos.160541
eng
http://dx.doi.org/10.1098/rsos.160541
http://creativecommons.org/licenses/by/4.0/
open access
2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited
Royal Society Open Science
oai:minerva.usc.es:10347/321492024-02-01T01:03:04Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
High pressure viscosity behaviour of tris(2-ethylhexyl) trimellitate up to 150 MPa
Liñeira del Río, José M.
García Guimarey, María Jesús
Comuñas, Maria JP
Fernández, Josefa
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Tris(2-ethylhexyl) trimellitate
Viscosity
High pressure
This article presents a study on the viscous behaviour at high pressure of a synthetic oil, tris(2-ethylhexyl) trimellitate (TOTM). This fluid is being recommended as potential industrial reference material for high viscosity-high pressure measurements. Here we report new experimental viscosity values for TOTM at temperatures from 278.15 K to 373.15 K and at pressures to 150 MPa with a maximum viscosity of 2570 mPa s. The measurements have been performed using a high pressure falling-body apparatus and a Couette rotational viscometer. The experimental values obtained in this work are included in the database of a multinational project used recently to develop a reference correlation for TOTM (Wakeham et al., 2017). The universal viscosity-pressure coefficient of this fluid has been evaluated and compared with other oils, finding that it is close to the literature values of mineral oils. Moreover, we perform an analysis of the dependency of viscosity on pressure and temperature based on the density scaling concept.
2024-01-31T10:06:41Z
2024-01-31T10:06:41Z
2024-01-31T10:06:41Z
2019-11
journal article
José M. Liñeira del Río, María J.G. Guimarey, María J.P. Comuñas, Josefa Fernández, High pressure viscosity behaviour of tris(2-ethylhexyl) trimellitate up to 150 MPa, The Journal of Chemical Thermodynamics, Volume 138, 2019, Pages 159-166, ISSN 0021-9614, https://doi.org/10.1016/j.jct.2019.06.016.
0021-9614
http://hdl.handle.net/10347/32149
10.1016/j.jct.2019.06.016
1096-3626
eng
https://doi.org/10.1016/j.jct.2019.06.016
http://creativecommons.org/licenses/by-nc-sa/4.0/
open access
CC BY-NC-ND
Elsevier
oai:minerva.usc.es:10347/185992020-01-31T14:36:54Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2921col_10347_10699col_10347_15784
Urbanity and the dynamics of language shift in Galicia
Mussa Juane, Mariamo
Seoane, Luis F.
Pérez Muñuzuri, Alberto
Mira Pérez, Jorge
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Física de Partículas
Complex networks
Interdisciplinary studies
Nonlinear phenomena
Social sciences
Sociology
Sociolinguistic phenomena often involve interactions across different scales and result in social and linguistic changes that can be tracked over time. Here, we focus on the dynamics of language shift in Galicia, a bilingual community in northwest Spain. Using historical data on Galician and Spanish speakers, we show that the rate at which shift dynamics unfold correlates inversely with the internal complexity of a region (approximated by the proportion of urban area). Less complex areas converge faster to steady states, while more complex ones sustain transitory dynamics longer. We further explore the contextual relevance of each region within the network of regions that constitute Galicia. The network is observed to sustain or reverse the dynamic rates. This model can introduce a competition between the internal complexity of a region and its contextual relevance in the network. Harnessing these sociodynamic features may prove useful in policy making to limit conflicts
2019-04-11T12:37:22Z
2019-04-11T12:37:22Z
2019-04-11T12:37:22Z
2019
journal article
Mussa Juane, M., Seoane, L., Muñuzuri, A., & Mira, J. (2019). Urbanity and the dynamics of language shift in Galicia. Nature Communications, 10(1). doi: 10.1038/s41467-019-09688-8
http://hdl.handle.net/10347/18599
10.1038/s41467-019-09688-8
2041-1723
eng
https://doi.org/10.1038/s41467-019-09688-8
http://creativecommons.org/licenses/by/4.0/
open access
© The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/
Atribución 4.0 Internacional
Springer Nature
oai:minerva.usc.es:10347/325672024-02-09T01:03:15Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Objective evaluation of static and dynamic behavior of different toric silicone-hydrogel contact lenses
Sánchez García, Ángel
González Pérez, Javier
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Toric silicone-hydrogel contact lens
Orientation position
Recovery time
Misalignment
Contact lens stability
Purpose
The present study aimed to estimate how orientation position, recovery time, and contact lens decentration, associated with visual performance, may vary on several designs of the most recent toric silicone-hydrogel toric contact lenses in two-time different moments.
Methods
To evaluate the toric silicone-hydrogel toric contact lens position and stability, it was conducted with a prospective, observational, randomized, and single-center case series including 95 astigmatic eyes wearing four toric silicone-hydrogel toric contact lenses for two weeks. Orientation and decentration were analyzed with ImageJ software from video-frames extracted with a Python application. Recovery time was evaluated after 45 degrees of inferior-temporal misorientation.
2024-02-08T09:10:21Z
2024-02-08T09:10:21Z
2024-02-08T09:10:21Z
2021-12-02
journal article
Ángel Sánchez-García, Javier González-Pérez, Objective evaluation of static and dynamic behavior of different toric silicone-hydrogel contact lenses, Contact Lens and Anterior Eye, Volume 44, Issue 6, 2021, 101437, ISSN 1367-0484, https://doi.org/10.1016/j.clae.2021.03.004.
1367-0484
http://hdl.handle.net/10347/32567
10.1016/j.clae.2021.03.004
1476-5411
eng
https://doi.org/10.1016/j.clae.2021.03.004
http://creativecommons.org/licenses/by-nc-nd/4.0/
open access
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/184082020-01-31T14:33:32Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Modelado de la competición lingüística gallego-castellano: definición y obtención de distancia interlingüística y extrapolación a futuro
Mira Pérez, Jorge
Paredes, Ángel
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Sociofísica
Sociolingüística
Sistemas complejos autoadaptativos
Distancia interlingüística
Ecuaciones diferenciales
Social physics
Sociolinguistics
Autoadaptative systems
Interlinguistic distance
Differential equations
Se analiza la evolución histórica de la situación lingüística de Galicia
en el marco de un modelo de competencia entre gallego y castellano. El
modelo, pese a ser la simplifi cación matemática de una compleja situación
sociolingüística, ajusta con notable precisión su evolución desde fi nales
del siglo XIX. Además, como generalización del resultado, se observa la
posibilidad de establecimiento de una situación bilingüe estable, sin que
ello implique la segregación de dos comunidades monolingües coexistentes
sobre un mismo territorio, en contra de predicciones teóricas previas.
Proponemos que la clave determinante para la estabilidad del bilingüismo
es un factor que defi ne la distancia interlingüística entre las lenguas en
competición, y que aquí es calculada para el binomio gallego-castellano. Por
último, se realizan proyecciones de futuro de la situación sociolingüística de
Galicia, que arrojan un crecimiento sostenido del grupo de monolingües en
castellano en detrimento del grupo de monolingües en gallego e incluso de
bilingües, que ya no sería un subgrupo estable en el tiempo, de no alcanzarse
ciertos valores mínimos en parámetros decisivos del modelo
We analyze the historic evolution of the sociolinguistic situation of
Galicia, in the framework of a competition model between Galician and
Castillian Spanish. Despite being the mathematical simplifi cation of a
complex sociolinguistic situation, the model fi ts successfully this evolution
since the end of the XIX century. We also detect the possible existence of a
stable bilingual point, without segregation of two coexisting monolingual
communities on the same territory, in contrast to some previous theoretical
predictions. We propose that the key point for the stability of bilingualism
is a factor that defi nes the interlinguistic distance between the languages
in competition, which here is calculated for the system Galician-Spanish.
Finally, we discuss some projections of the future sociolinguistic situation
of Galicia, that yield a monotonous increase of the group of Castillian
monolinguals to the detriment of the groups of Galician monolinguals and
bilinguals. It is worth mentioning that these groups would not be stable in
time unless some minimum parameters of the model were achieved
2019-03-18T13:29:13Z
2019-03-18T13:29:13Z
2019-03-18T13:29:13Z
2007
journal article
Mira Pérez, J. y Paredes, Á. (2007). Modelado de la competición lingüística gallego-castellano: definición y obtención de distancia interlingüística y extrapolación a futuro. Revista Real Academia Galega de Ciencias, vol. XXVI, pp. 5-16
1135-5417
http://hdl.handle.net/10347/18408
spa
https://www.ragc.gal/sites/default/files/revistas/articulos/pdf/modelado.pdf
open access
© Real Academia Galega das Ciencias, 2007
Real Academia Galega de Ciencias
oai:minerva.usc.es:10347/312172023-11-09T01:02:58Zcom_10347_20714com_10347_2889com_10347_227com_10347_2955com_10347_2893com_10347_2888com_10347_2919com_10347_2891col_10347_20715col_10347_12262col_10347_10699
LED-driven photo-Fenton process for micropollutant removal by nanostructured magnetite anchored in mesoporous silica
González Rodríguez, Jorge
Conde López, Julio José
Vargas Osorio, Zulema
Vázquez Vázquez, Carlos
Piñeiro Redondo, Yolanda
Rivas Rey, José
Feijoo Costa, Gumersindo
Moreira Vilar, María Teresa
Universidade de Santiago de Compostela. Departamento de Enxeñaría Química
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Instituto Interdisciplinar de Tecnoloxías Ambientais (CRETUS)
Reusability
Degradation pathways
Kinetics
Magnetic nanoparticles
LED
Supported catalysts
The presence of organic micropollutants in water bodies represents a threat to living organisms and ecosystems due to their toxicological effects and recalcitrance in conventional wastewater treatments. In this context, the application of heterogeneous photo-Fenton based on magnetite nanoparticles supported on mesoporous silica (SBA15) is proposed to carry out the non-specific degradation of the model compounds ibuprofen, carbamazepine, hormones, bisphenol A and the dye ProcionRed®. The operating conditions (i.e., pH, catalyst load and hydrogen peroxide concentration) were optimized by Response Surface Methodology (RSM). The paramagnetic properties of the nanocatalysts allowed their repeated use in sequential batch operations with catalyst losses below 1%. The feasibility of the process was demonstrated as removal rates above 90% after twelve accomplished after twelve consecutive cycles. In addition, the contributions of different reactive oxygen species, mainly •OH, were analyzed together with the formation of by-products, achieving total mineralization values of 15% on average
2023-11-08T09:44:41Z
2023-11-08T09:44:41Z
2023-11-08T09:44:41Z
2023-10-21
journal article
Journal of Environmental Management 349 (2024) 119461
0301-4797
http://hdl.handle.net/10347/31217
10.1016/j.jenvman.2023.119461
eng
https://doi.org/10.1016/j.jenvman.2023.119461
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-111163RB-I00/ES/NANOCATALIZADORES DE ALTO RENDIMIENTO PARA APLICACIONES MEDIOAMBIENTALES (HP-NANOBIO)/
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PDC2021-121540-I00/ES/
http://creativecommons.org/licenses/by/4.0/
open access
©2023 The Authors. Published by Elsevier Ltd.This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Atribución 4.0 Internacional
Elsevier
oai:minerva.usc.es:10347/290252023-07-10T06:11:03Zcom_10347_2988com_10347_2889com_10347_227com_10347_2919com_10347_2891com_10347_2888com_10347_2925col_10347_11762col_10347_10699col_10347_9937
Tuning coherent-phonon heat transport in LaCoO3/SrTiO3 Superlattices
Rivadulla Fernández, José Francisco
Bugallo Ferrón, David
Langenberg Pérez, Eric
Carbo-Argibay, Enrique
Varela Domínguez, Noa
Otero Fumega, Adolfo
Pardo Castro, Víctor
Lucas del Pozo, Irene
Morellón Alquézar, Luis Alberto
Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Química Física
Interfaces
Lattices
Phonons
Thermal conductivity
Thickness
Accessing the regime of coherent phonon propagation in nanostructures opens enormous possibilities to control the thermal conductivity in energy harvesting devices, phononic circuits, etc. In this paper we show that coherent phonons contribute substantially to the thermal conductivity of LaCoO3/SrTiO3 oxide superlattices, up to room temperature. We show that their contribution can be tuned through small variations of the superlattice periodicity, without changing the total superlattice thickness. Using this strategy, we tuned the thermal conductivity by 20% at room temperature. We also discuss the role of interface mixing and epitaxial relaxation as an extrinsic, material dependent key parameter for understanding the thermal conductivity of oxide superlattices
2022-08-05T12:09:18Z
2022-08-05T12:09:18Z
2022-08-05T12:09:18Z
2021
journal article
J. Phys. Chem. Lett. 2021, 12, 11878−11885. https://doi.org/10.1021/acs.jpclett.1c03418
1948-7185
http://hdl.handle.net/10347/29025
10.1021/acs.jpclett.1c03418
eng
https://doi.org/10.1021/acs.jpclett.1c03418
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-104150RB-I00/ES/MATERIALES FUNCIONALES PARA EL CONTROL ACTIVO DE LA CONDUCTIVIDAD TERMICA
info:eu-repo/grantAgreement/EC/H2020/734187
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-101334-B-C21/ES/MAGNETISMO EMERGENTE EN MATERIALES BIDIMENSIONALES
http://creativecommons.org/licenses/by/4.0/
open access
© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/)
ACS Publications
oai:minerva.usc.es:10347/267722021-08-12T02:02:26Zcom_10347_2899com_10347_2890com_10347_2888com_10347_227com_10347_2919com_10347_2891col_10347_13398col_10347_10699
Improvement of Edge Brightening by Means of Q Factor Minimization in Circular Antenna Apertures: High Efficient Taylor-Like Patterns
Salas Sánchez, Aarón Ángel
Rodríguez González, Juan Antonio
López Martín, María Elena
Rocca, Paolo
Rodríguez González, Juan Antonio
López Martín, María Elena
Ares Pena, Francisco José
Universidade de Santiago de Compostela. Departamento de Ciencias Morfolóxicas
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Circular Taylor distributions
Edge brightening
Optimization techniques
Q factor
Super gain ratio
Implications and improvements of edge brightening effects led by Q factor minimization restricted to keep the same level of directivity for high efficiency continuous circular aperture distributions are here reported. In this manner, an optimization strategy for a minimum Q value-keeping the same level of efficiency and restricting the maximum sidelobe level (SLL)- is envisaged. As application of the method, a design procedure devoted to reduce the Q factor of the antenna aperture distributions while keeping a high level of efficiency is outlined. Then, these optimal Taylor distributions are used as initial point to develop an optimization strategy. This procedure is devoted to search Taylor-like distributions which offer a good compromise between low Q factor and high efficiency values with potentials for the antenna design scenario, based on a decrease in edge brightening effects led by the minimization of the aforementioned Q ratio
2021-08-11T12:57:55Z
2021-08-11T12:57:55Z
2021-08-11T12:57:55Z
2020
journal article
IEEE Access 2020, 8:184004-184012. https://doi.org/10.1109/ACCESS.2020.3029402
http://hdl.handle.net/10347/26772
10.1109/ACCESS.2020.3029402
2169-3536
eng
https://doi.org/10.1109/ACCESS.2020.3029402
http://creativecommons.org/licenses/by/4.0/
open access
© 2020 by the authors. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
Atribución 4.0 Internacional
IEEE
oai:minerva.usc.es:10347/297832023-07-10T06:11:27Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227col_10347_10699
Estimating linear radiance indicators from the zenith night-sky brightness: on the Posch ratio for natural and light-polluted skies
Bará Viñas, Salvador Xurxo
Pérez Couto, Javier
Falchi, Fabio
Kocifaj, Miroslav
Masana, Eduard
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Scattering
Atmospheric effects
Light pollution
Methods: numerical
Estimating the horizontal irradiance from measurements of the zenith night-sky radiance is a useful operation for basic and applied studies in observatory site assessment, atmospheric optics, and environmental sciences. The ratio between these two quantities, also known as the Posch ratio, has previously been studied for some canonical cases and reported for a few observational sites. In this work we (a) generalize the Posch ratio concept, extending it to any pair of radiance-related linear indicators, (b) describe its main algebraic properties, and (c) provide analytical expressions and numerical evaluations for its three basic night-time components (moonlight, starlight and other astrophysical light sources, and artificial light). We show that the horizontal irradiance (or any other linear radiance indicator) is generally correlated with the zenith radiance, enabling its estimation from zenith measurements if some a priori information on the atmospheric state is available
2023-01-05T12:48:01Z
2023-01-05T12:48:01Z
2023-01-05T12:48:01Z
2022
journal article
Salvador Bará, Xabier Pérez-Couto, Fabio Falchi, Miroslav Kocifaj, Eduard Masana, Estimating linear radiance indicators from the zenith night-sky brightness: on the Posch ratio for natural and light-polluted skies, Monthly Notices of the Royal Astronomical Society, Volume 512, Issue 2, May 2022, Pages 2125–2134, https://doi.org/10.1093/mnras/stac410
0035-8711
http://hdl.handle.net/10347/29783
10.1093/mnras/stac410
1365-2966
eng
https://doi.org/10.1093/mnras/stac410
Info:eu-repo/grantAgreement/EC//RTI2018-095076-B-C21
open access
© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Oxford University Press
oai:minerva.usc.es:10347/212592020-04-09T02:00:56Zcom_10347_2990com_10347_2889com_10347_227com_10347_2953com_10347_2893com_10347_2888com_10347_2919com_10347_2891col_10347_11719col_10347_15488col_10347_10699
On the relationship between optical variability, visual saliency, and eye fixations: a computational approach
García Díaz, Antón
Leborán Álvarez, Víctor
Fernández Vidal, Xosé Ramón
Pardo López, Xosé Manuel
Universidade de Santiago de Compostela. Centro de Investigación en Tecnoloxías da Información
Universidade de Santiago de Compostela. Departamento de Electrónica e Computación
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Optical variability
Contextual adaptation
Saliency
Efficient coding
Eye fixations
Face saliency
Hyperspectral
A hierarchical definition of optical variability is proposed that links physical magnitudes to visual saliency and yields a more reductionist interpretation than previous approaches. This definition is shown to be grounded on the classical efficient coding hypothesis. Moreover, we propose that a major goal of contextual adaptation mechanisms is to ensure the invariance of the behavior that the contribution of an image point to optical variability elicits in the visual system. This hypothesis and the necessary assumptions are tested through the comparison with human fixations and state-of-the-art approaches to saliency in three open access eye-tracking datasets, including one devoted to images with faces, as well as in a novel experiment using hyperspectral representations of surface reflectance. The results on faces yield a significant reduction of the potential strength of semantic influences compared to previous works. The results on hyperspectral images support the assumptions to estimate optical variability. As well, the proposed approach explains quantitative results related to a visual illusion observed for images of corners, which does not involve eye movements
2020-04-08T13:53:14Z
2020-04-08T13:53:14Z
2020-04-08T13:53:14Z
2012
journal article
Garcia-Diaz, A., Leborán, V., Fdez-Vidal, X. R., & Pardo, X. M. (2012). On the relationship between optical
variability, visual saliency, and eye fixations: A computational approach. Journal of Vision, 12(6):17, 1–22, http://www.
journalofvision.org/content/12/6/17, doi:10.1167/12.6.17
http://hdl.handle.net/10347/21259
10.1167/12.6.17
1534-7362
eng
https://doi.org/10.1167/12.6.17
https://creativecommons.org/licenses/by-nc-nd/4.0/
open access
© 2019 ARVO. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license (https://creativecommons.org/licenses/by-nc-nd/4.0/)
Association for Research in Vision and Ophthalmology
oai:minerva.usc.es:10347/213492023-07-10T06:18:01Zcom_10347_2919com_10347_2891com_10347_2888com_10347_227com_10347_2912com_10347_2890col_10347_10699col_10347_13405
Multifunctional Superparamagnetic Stiff Nanoreservoirs for Blood Brain Barrier Applications
Vargas Osorio, Zulema
Silva Candal, Andrés da
Piñeiro Redondo, Yolanda
Iglesias Rey, Ramón
Sobrino Moreiras, Tomás
Campos Pérez, Francisco
Castillo Sánchez, José Antonio
Rivas Rey, José
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Universidade de Santiago de Compostela. Departamento de Psiquiatría, Radioloxía, Saúde Pública, Enfermaría e Medicina
Theranostic nanostructure
MRI contrast
Neurological diseases
Neurological diseases (Alzheimer’s disease, Parkinson’s disease, and stroke) are becoming
a major concern for health systems in developed countries due to the increment of ageing in the
population, and many resources are devoted to the development of new therapies and contrast
agents for selective imaging. However, the strong isolation of the brain by the brain blood barrier
(BBB) prevents not only the crossing of pathogens, but also a large set of beneficial drugs. Therefore,
an alternative strategy is arising based on the anchoring to vascular endothelial cells of nanoplatforms
working as delivery reservoirs. In this work, novel injectable mesoporous nanorods, wrapped by
a fluorescent magnetic nanoparticles envelope, are proposed as biocompatible reservoirs with an
extremely high loading capacity, surface versatility, and optimal morphology for enhanced grafting
to vessels during their diffusive flow. Wet chemistry techniques allow for the development of
mesoporous silica nanostructures with tailored properties, such as a fluorescent response suitable
for optical studies, superparamagnetic behavior for magnetic resonance imaging MRI contrast, and
large range ordered porosity for controlled delivery. In this work, fluorescent magnetic mesoporous
nanorods were physicochemical characterized and tested in preliminary biological in vitro and
in vivo experiments, showing a transversal relaxivitiy of 324.68 mM−1
s
−1
, intense fluorescence, large
specific surface area (300 m2 g
−1
), and biocompatibility for endothelial cells’ uptake up to 100 µg (in
a 80% confluent 1.9 cm2
culture well), with no liver and kidney disability. These magnetic fluorescent
nanostructures allow for multimodal MRI/optical imaging, the allocation of therapeutic moieties,
and targeting of tissues with specific damage.
2020-04-13T22:59:14Z
2020-04-13T22:59:14Z
2020-04-13T22:59:14Z
2019
journal article
Vargas-Osorio, Z.; Da Silva-Candal, A.; Piñeiro, Y.; Iglesias-Rey, R.; Sobrino, T.; Campos, F.; Castillo, J.; Rivas, J. Multifunctional Superparamagnetic Stiff Nanoreservoirs for Blood Brain Barrier Applications. Nanomaterials 2019, 9, 449
http://hdl.handle.net/10347/21349
10.3390/nano9030449
2079-4991
eng
https://doi.org/10.3390/nano9030449
info:eu-repo/grantAgreement/EC/H2020/686009
https://creativecommons.org/licenses/by/4.0/
open access
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)
MDPI
oai:minerva.usc.es:10347/217972020-04-28T02:01:34Zcom_10347_2953com_10347_2893com_10347_2888com_10347_227com_10347_2919com_10347_2891col_10347_15488col_10347_10699
Automated semantic annotation of rare disease cases: a case study
Taboada Iglesias, María Jesús
Rodríguez Castiñeira, Hadriana
Martínez Hernández, Diego
Pardo Parrado, María
Sobrido Gómez, María Jesús
Universidade de Santiago de Compostela. Departamento de Electrónica e Computación
Universidade de Santiago de Compostela. Departamento de Física Aplicada
Cerebrotendinous xanthomatosis
Rare disease
Genetic sequencing technologies
Motivation: As the number of clinical reports in the peer-reviewed medical literature keeps growing, there is an increasing need for online search tools to find and analyze publications on patients with similar clinical characteristics. This problem is especially critical and challenging for rare diseases, where publications of large series are scarce. Through an applied example, we illustrate how to automatically identify new relevant cases and semantically annotate the relevant literature about patient case reports to capture the phenotype of a rare disease named cerebrotendinous xanthomatosis.
Results: Our results confirm that it is possible to automatically identify new relevant case reports with a high precision and to annotate them with a satisfactory quality (74% F-measure). Automated annotation with an emphasis to entirely describe all phenotypic abnormalities found in a disease may facilitate curation efforts by supplying phenotype retrieval and assessment of their frequency
2020-04-27T12:59:34Z
2020-04-27T12:59:34Z
2020-04-27T12:59:34Z
2014
journal article
Maria Taboada, Hadriana Rodríguez, Diego Martínez, María Pardo, María Jesús Sobrido, Automated semantic annotation of rare disease cases: a case study, Database, Volume 2014, 2014, bau045, https://doi.org/10.1093/database/bau045
http://hdl.handle.net/10347/21797
10.1093/database/bau045
10.1093/database/bav107
1758-0463
eng
https://doi.org/10.1093/database/bau045
http://creativecommons.org/licenses/by/3.0/
open access
© The Author(s) 2014. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited
Oxford Univesity Press
qdc///col_10347_10699/100