Singular Solutions
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. Tutelas de urgência no sistema recursal: agravo de instrumento e apelação cível
The scope of this paper is the analysis of procedural urgent measures in interlocutory and civil appeals. More specifically, we examine the suspension of the suit, and the role of injunction and provisional measures as an activity of the reporting justice who will analyze such appeals. The latest amendments to the Brazilian Code of Civil Procedure, as well a
Publicado em: 2010
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14. Comparação de desempenho entre as formulações singular e ipersingular do método dos elementos de contorno
In this work, the Singular and Hypersingular Formulations of the Boundary Element Method are presented and their results are compared on two dimensional stationary scalar field problems , governed by the Laplace Equation. In the conventional formulations of the Boundary Element Method, a special attention must be given to the singular integrations that appea
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/05/2009
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15. LRS Bianchi type -V cosmology with heat flow in scalar: tensor theory
In this paper we present a spatially homogeneous locally rotationally symmetric (LRS) Bianchi type -V perfect fluid model with heat conduction in scalar tensor theory proposed by Saez and Ballester. The field equations are solved with and without heat conduction by using a law of variation for the mean Hubble parameter, which is related to the average scale
Brazilian Journal of Physics. Publicado em: 2009-12
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16. Evaluation of non-singular BEM algorithms for potential problems
Two non-singular boundary element method (BEM) algorithms for two-dimensional potential problems have been implemented using isoparametric quadratic, cubic and quartic elements. The first one is based on the self-regular potential boundary integral equation (BIE) and the second on the self-regular flux-BIE. The flux-BIE requires the C1,α continuity of the d
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-09
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17. Formulação dual em mecânica da fratura utilizando elementos de contorno curvos de ordem qualquer / Dual boundary element formulation in fracture mechanics using curved element of any order
This work presents the dual boundary element formulation applied to linear crack problem. The goal of this research is the evaluation of stress intensity factor for two-dimensional crack problem using three different techniques, which are: the technique of correlation of displacements, the technique based on the state of tension at the crack tip and J integr
Publicado em: 2009
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18. On analytic singularities of a class of vector fields on the torus / Sobre singularidades analíticas de soluções de uma classe de campos vetoriais no Toro
O objetivo principal deste trabalho é o estudo da regularidade anallítica global de certos operadores diferenciais definidos no toro. Uma ferramenta fundamental utilizada neste estudo são as séries parciais de Fourier, que nos permitem caracterizar tanto as distribuições periódicas quanto as funções anallíticas reais periódicas através do comport
Publicado em: 2009
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19. Auto-similaridade e unicidade para um sistema semilinear e existÃncia de soluÃÃo com dado singular para a equaÃÃo da onda semilinear
We obtain well-posedeness of small global solutions in Marcinkiewicz spaces L(p1,∞) x L(p2,∞) for semilinear systems. Mild solutions are obtained in this space with the right index to allow the existence of self-similar solutions. Using our estimates of the nonlinear coupling term, we prove the uniqueness of solutions in the class C([0,∞);L
Publicado em: 2008
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20. Topological spins solutions on the torus / Soluções topológicas de spins no toro
Estudamos o modelo de Heisenberg para spins clássicos no suporte toroidal. O regime isotrópico é caracterizado por uma solução solitônica fracionária. Quando o tamanho do toro é muito grande, R → ∞, sua carga se iguala à unidade e o sóliton efetivamente se comporta como no caso do cilindro infinito. Entretanto, para R = 0 a geometria es
Publicado em: 2008
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21. Equações elípticas com dependência não linear do gradiente
In this thesis we study the existence of solutions for elliptic equations with nonlinear dependence on the gradient of the solution. More precisely, we guarantee the existence of solution for the following classes of problems. (P1)_2u + q_u + _(x)u = f(x; u;ru;_u) in u(x) = 0; _u(x) = 0 on @; where _ RN;N _ 5, is a bounded smooth domain. (P2) uiv + qu00 + _(
Publicado em: 2008
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22. Método de "shooting" aplicado a problemas de EDP s singulares envolvendo os operadores laplaciano e monge-ampère
Neste trabalho ilustramos a aplicação do Método de "Shooting" em duas classes totalmente distintas de problemas de Equações Diferenciais parciais - ambas com valores de fronteira nulos e em domínios limitados -, uma envolvendo o operador Laplaciano e a outra o operador de Monge-Ampère. Estudamos estes problemas na situação em que as perturbações n
Publicado em: 2007
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23. Soluções "ground states" para uma classe de problemas elípticos semilineares
We will consider in this work a class of semilinear problems in RN whose main characteristic is the presence of a singular term in the not linear perturbation of the operator. Combining variational techniques, arguments of the type upper and lower solutions and principle of comparison we prove a theorem, due to Zhang [49], 2007, that it establishes the exist
Publicado em: 2007
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24. The period vehicle routing problem. / O problema de roteirização periódica de veículos.
The period vehicle routing problem can be viewed as a generalization of the classic vehicle routing problem due to two singular features: a planning period longer than one day in which vehicles make several trips and frequencies of visit associated to points to be serviced. This type of problem may arise in different practical applications. Nowadays, some Br
Publicado em: 2007