Cauchy Problem
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Hankel transformation method for solving the Westergaard problem for point, line and distributed loads on elastic half-space
Abstract The Hankel transformation method was used in this work to determine the normal and shear stress distributions due to point, line and distributed loads applied to the surface of an elastic media. The elastic media considered in this study was assumed to be inextensible in the horizontal directions, and the only non-vanishing displacement component is
Lat. Am. j. solids struct.. Publicado em: 04/02/2019
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2. Superposition of Stress Fields in Diametrically Compressed Cylinders
Abstract The theoretical analysis for the Brazilian test is a classical plane stress problem of elasticity theory, where a vertical force is applied to a horizontal plane, the boundary of a semi-infinite medium. Hypothesizing a normal radial stress field, the results of that model are correct. Nevertheless, the superposition of three stress fields, with two
Lat. Am. j. solids struct.. Publicado em: 2016-10
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3. O problema de Cauchy para sistemas quase-lineares hiperbólicos é bem posto em espaços de Hölder
Nós consideramos o problema de Cauchy para sistemas quase-lineares, ou seja o sistema é hiperbólico em u = 0. Demonstramos que certos espaços de Besov são preservados pelo fluxo da solução, perto da solução nula.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2012
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4. O problema de Cauchy para a equação não linear de Schrödinger com dados não nulos no infinito. / The Cauchy Problem associated to the nonlinear Schrödinger equation with data nonvanishing at infinity.
Neste trabalho fazemos um estudo do Problema de Cauchy associado à equação não linear de Schrödinger com dados iniciais não nulos no infinito. No primeiro capítulo, apresentamos os espaços de Zhidkov em uma dimensão, e mostramos algumas de suas propriedades. No segundo capítulo, provamos que o operador de Schrödinger é um grupo de operadores fort
Publicado em: 2009
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5. Funções s-assintoticamente periódicas em espaços de Banach e aplicações à equações diferenciais funcionais / S-asymptotically periodic functions on Banach spaces and applications for functional differential equations
This work is devoted to the study of the class of continuous and bounded functions f : [0 INFINIT) ARROWX for which there exists omega>0 such that limt IND.t ARROWINFINIT(f(t + omega!) - f(t)) = 0 (in the sequel called S-asymptotically !-periodic functions). We discuss qualitative properties and establish some relationships between this type of functions and
Publicado em: 2009
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6. 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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7. Existencia e estabilidade de ondas viajantes periodicas para alguns modelos dispersivos / Existence and stability of periodic travelling waves for some dispersive models
The goal of this thesis is to study the properties of solutions of some dispersive differential equations. First, we develop a local and global well-posedness theory for the regularized Benjamin-Ono equation in the periodic setting, then, we show that the Cauchy problem for this equation (in both periodic and nonperiodic cases) cannot be solved by an iterati
Publicado em: 2009
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8. SoluÃÃes auto - similares e comportamento assintÃtico para as equaÃÃes de navier - Stokes
This master dissertation deals with the Navier-Stokes s equations on Rm, assuming that the fluid is incompressible and homogeneous. We analyzed the Cauchy s problem in Marcinkiewicz spaces (L p−weak), with the right index to allow the existence of selfsimilar solutions. We also study the asymptotic behavior of the solutions and show the existence of a
Publicado em: 2008
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9. 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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10. O problema de Cauchy para um sistema de equações do tipo Schrodinger não linear de terceira ordem / The Cauchy problem associated to a system of coupled third-order nonlinear Schrodinger equation
In this work we study the Cauchy problem associated to a system of coupled third-order nonlinear Schrodinger equation. We establish local well-posedness results for the problem with data in Sobolev spaces Hs(R) x Hs(R), s >or = 1/4 and in the periodic case Hs(T)xHs(T), s >or = 1/2. In the particular case ... Note: The complete abstract is available with the
Publicado em: 2007
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11. Two approximate methods of a Cauchy problem for the Helmholtz equation
In this paper, we consider a Cauchy problem for the Helmholtz equation at fixed frequency, especially we give the optimal error bound for the ill-posed problem. Within the framework of general regularization theory, we present some spectral regularization methods and a modified Tikhonov regularization method to stabilize the problem. Moreover, Hölder-type s
Computational & Applied Mathematics. Publicado em: 2007
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12. The Cauchy problem associated to a system of coupled third-order nonlinear Schrodinger equation / O problema de Cauchy para um sistema de equações do tipo Schrodinger não linear de terceira ordem
Neste trabalho estudamos o problema de Cauchy associado a um sistema de Equações do tipo Schrodinger não linear de terceira ordem. Obtemos resultados de boa colocação local para o problema, com dado inicial nos espaços de Sobolev Hs(R) x Hs(R), s >ou = 1/4 e no caso períodico em Hs(T)xHs(T), s >ou = 1/2. No caso particular sigma alfa = sigma beta = si
Publicado em: 2007