Browsing EIOArtigos by Title
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Necessary and sufficient conditions for the existence of nonconstant solutions generated by impulses of second order BVPs with convex potential
(University of Szeged, 2018)This paper concerns solutions generated by impulses for a class of second order BVPs with convex potential. Necessary and sufficient conditions for the existence of nonconstant solutions are derived via variational methods ... 
A new formula to get sharp global stability criteria for onedimensional discretetime models
(Springer, 20190110)We present a new formula that makes it possible to get sharp global stability results for onedimensional discretetime models in an easy way. In particular, it allows to show that the local asymptotic stability of a ... 
A new method for analysing and representing ground temperature variations in cold environments. The Fuegian Andes, Tierra del Fuego, Argentina
(Universidad de La Rioja, 2018)The thermal response of soils in cold environments has been investigated in numerous studies. The data considered here were obtained in a study carried out in Tierra del Fuego, Argentina, as part of the IV International Polar ... 
A new type of Taylor series expansion
(SpringerOpen, 20180515)We present a variant of the classical integration by parts to introduce a new type of Taylor series expansion and to present some closed forms for integrals involving Jacobi and Laguerre polynomials, which cannot be directly ... 
NonTrivial Solutions of NonAutonomous Nabla Fractional Difference Boundary Value Problems
(MDPI, 2021)In this article, we present a twopoint boundary value problem with separated boundary conditions for a finite nabla fractional difference equation. First, we construct an associated Green’s function as a series of functions ... 
Nonlinear differential equations with perturbed Dirichlet integral boundary conditions
(Springer, 2021)This paper is devoted to prove the existence of positive solutions of a second order differential equation with a nonhomogeneous Dirichlet conditions given by a parameter dependence integral. The studied problem is a ... 
A nonparametric approach to the estimation of lengths and surface areas
(Institute of Mathematical Statistics, 2007)The Minkowski content L0(G) of a body G⊂ℝd represents the boundary length (for d=2) or the surface area (for d=3) of G. A method for estimating L0(G) is proposed. It relies on a nonparametric estimator based on the information ... 
Nontrivial solutions of inverse discrete problems with signchanging nonlinearities
(Springer, 2019)This paper is concerned with the existence of solutions of an inverse discrete problem with signchanging nonlinearity. This kind of problems includes, as a particular case, nth order difference equations coupled with ... 
A Novel Technique to Control the Accuracy of a Nonlinear Fractional Order Model of COVID19: Application of the CESTAC Method and the CADNA Library
(MDPI, 2021)In this paper, a nonlinear fractional order model of COVID19 is approximated. For this aim, at first we apply the Caputo–Fabrizio fractional derivative to model the usual form of the phenomenon. In order to show the ... 
A Novel Technique to Solve the Fuzzy System of Equations
(MDPI, 2020)The aim of this research is to apply a novel technique based on the embedding method to solve the n×n fuzzy system of linear equations (FSLEs). By using this method, the strong fuzzy number solutions of FSLEs can be obtained ... 
NPCirc: An R package for nonparametric circular methods
(American Statistical Association, 201410)Nonparametric density and regression estimation methods for circular data are included in the R package NPCirc. Speci cally, a circular kernel density estimation procedure is provided, jointly with di erent alternatives ... 
Numerical Solution of Stieltjes Differential Equations
(MDPI, 2020)This work is devoted to the obtaining of a new numerical scheme based on quadrature formulae for the Lebesgue–Stieltjes integral for the approximation of Stieltjes ordinary differential equations. This novel method allows ... 
On a discontinuous beamtype equation with deviating argument in the curvature
(Springer International Publishing, 20161012) 
On a new class of antiperiodic fractional boundary value problems
(Hindawi, 2013)This paper investigates a new class of antiperiodic boundary value problems of higher order fractional differential equations. Some existence and uniqueness results are obtained by applying some standard fixed point ... 
On estimating the perimeter using the alphashape
(Institut Henri Poincaré, 2017)We consider the problem of estimating the perimeter of a smooth domain in the plane based on a sample from the uniform distribution over the domain. We study the performance of the estimator defined as the perimeter of the ... 
On Exact Controllability of FirstOrder Impulsive Differential Equations
(SpringerOpen, 2010)Many dynamical systems have an impulsive dynamical behavior due to abrupt changes at certain instants during the evolution process. The mathematical description of these phenomena leads to impulsive differential equations. ... 
On fractional derivatives and primitives of periodic functions
(Hindawi, 2014)We prove that the fractional derivative or the fractional primitive of a periodic function cannot be a 𝑇periodic function, for any period 𝑇, with the exception of the zero function 
On fractional Langevin equation involving two fractional orders in different intervals
(Vilnius University Press, 2019)In this paper, we study a nonlinear Langevin equation involving two fractional orders α ∈ (0; 1] and β ∈ (1; 2] with initial conditions. By means of an interesting fixed point theorem, we establish sufficient conditions ... 
On fractional order dengue epidemic model
(Hindawi, 2014)This paper deals with the fractional order dengue epidemic model. The stability of diseasefree and positive fixed points is studied. AdamsBashforthMoulton algorithm has been used to solve and simulate the system of ... 
On fractional orthonormal polynomials of a discrete variable
(Hindawi, 2015)A fractional analogue of classical Gram or discrete Chebyshev polynomials is introduced. Basic properties as well as their relation with the fractional analogue of Legendre polynomials are presented.