Now showing items 21-30 of 55
Existência e configuração de ciclos limites em sistemas diferenciais planares
(Universidade Federal de Santa Maria, 2018-03-16)
In this dissertation, we present results on the existence of limit cycles in planar differential systems, configuration of such cycles and the dynamics of nonlinear systems near periodic orbits.
Instabilidade difusiva em um modelo presa-predador generalista
(Universidade Federal de Santa Maria, 2017-01-26)
In this work, we investigate the pattern formation of a reaction-diffusion generalist predator-prey system with constant alternative food source and a Holling type III functional response. The local model can exhibit up ...
O problema de Dirichlet para a equacão dos gráficos mínimos com dado no bordo lipschitz contínuo
(Universidade Federal de Santa Maria, 2016-12-02)
In this work, we study existence and non existence for the Dirichlet problem for the minimal graph equation in non convex domains of the plane. We search for conditions on the boundary data which be the less restricted ...
SOLUÇÕES FRACAS DE EQUAÇÕES DE FLUIDO EM MEIOS POROSOS
(Universidade Federal de Santa Maria, 2009-12-21)
In this work we study equations that describe laminar flow through a rigid isotropic granular (non consolidated) porous medium subjected to a external force field. Firstly we present the meaning of the many phisical terms ...
O MODELO DE McCORMACK NO ESCOAMENTO DE GASES RAREFEITOS
(Universidade Federal de Santa Maria, 2011-02-24)
In this paper, we present numerical results for macroscopic quantities of interest (velocity profile, the heat ow profile and shear stress) for the ow of a binary mixture of rarefied gases in microchannels of arbitrary ...
ENVOLVENTES PARA AÇÕES PARCIAIS DE GRUPOS E DE ÁLGEBRAS DE HOPF
(Universidade Federal de Santa Maria, 2012-02-01)
Based on the articles Associativity of crossed produts by partial actions, enveloping actions and partial representations" of M. Dokuchaev and R. Exel ( and Enveloping Actions for Partial Hopf Actions" of M.M.S. Alves ...
SOLUÇÃO DE PROBLEMAS EM SEMIESPAÇO NA DINÂMICA DE GASES RAREFEITOS BASEADA EM MODELOS CINÉTICOS
(Universidade Federal de Santa Maria, 2012-02-28)
The method discrete ordinates is used to solve problems involving rarefied gas dynamics. In this work, a version of the analytical method discrete ordinates (ADO) is used to solve problems in a semi-infinite. The complete ...
SOLUÇÕES FUNDAMENTAIS DE OPERADORES LINEARES DE COEFICIENTES CONSTANTES
(Universidade Federal de Santa Maria, 2012-03-09)
In this thesis we present a proof of the Malgrange-Ehrenpreis theorem, which states that every operator with constant coefficients non identically zero has a fundamental solution.
O TEOREMA DE CAUCHY EM EQUAÇÕES DE NAVIER-STOKES
(Universidade Federal de Santa Maria, 2013-03-08)
This work presents the Cauchy's theorem in its classical form, and aims to weaken their hypotheses, providing a more advantageous use in continuum mechanics. The methodology is axiomatic, that is, basic concepts are presented ...
Bifurcação de Turing-Hopf em um Sistema Presa-Predador
(Universidade Federal de Santa Maria, 2012-06-04)
In this work we studing a generalized predator-prey system in a spatial domain, in terms of formation. We show parameter, regions where transcritical, Hopf and Turing bifurcations appear are presented, and also some spatial ...