Elliptic Equation
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Simple but accurate periodic solutions for the nonlinear pendulum equation
Abstract Despite its elementary structure, the simple pendulum oscillations are described by a nonlinear differential equation whose exact solution for the angular displacement from vertical as a function of time cannot be expressed in terms of an elementary function, so either a numerical treatment or some analytical approximation is ultimately demanded. Su
Rev. Bras. Ensino Fís.. Publicado em: 21/09/2018
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2. On Convergence and Solvability of an Elliptic Equation by Finite Difference Method
RESUMO Neste artigo tratamos as questões de convergência, existência e unicidade da solução numérica de um problema elíptico discretizado pelo método de diferenças finitas. A fim de provarmos a existência e unicidade da solução numérica, usaremos uma configuração variacional adequada (em nível discreto) para garantirmos a existência de uma s
TEMA (São Carlos). Publicado em: 2017-04
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3. Existência e homogeneização para um problema elíptico com fronteira livre não estacionária / Existence and homogenization for an elliptic problem with nonstationary free boundary
In this dissertation we study an elliptic problem in a bounded Lipschitz domain. Part of the boundary is moving and oscillates rapidly in the variable representing the space. Thus, we have a multi-scale free boundary problem. This problem has applications, for instance, in the construction of semiconductor films taking into account that the surface of the fi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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4. Simetria radial de soluções positivas de sistemas elípticos cooperativos / Radial symmetry of positive solutions of cooperative elliptic systems
Neste trabalho estudamos a questão de simetria de soluções positivas de equações e sistemas de equações diferenciais parciais. Descrevemos em detalhe a demonstração de dois resultados sobre simetria radial, um para equações em domínios limitados e outro para sistemas de equações no espaço todo. Ambas as demonstrações baseiam-se no método do
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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5. Multiplicidade de soluções para equação de quarta ordem / Multiplicity of solutions for fourth order equation
O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/10/2011
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6. Indicadores de erros a posteriori na aproximação de funcionais de soluções de problemas elípticos no contexto do método Galerkin descontínuo hp-adaptivo / A posteriori error indicators in the approximation of functionals of elliptic problems solutions in the context of hp-adaptive discontinuous Galerkin method
In this work we study goal-oriented a posteriori error indicators for approximations by the discontinuous Galerkin method for the biharmonic and Poisson equations. The methodology used for the indicators is based on the dual problem associated with the functional, which is known to generate the most effective indicators. The two main error indicators based o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011
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7. A new multilevel smoothing method for wavelet-based algebraic multigrid poisson problem solver
In contrast to the standard algebraic multigrid, the Wavelet-based Algebraic Multigrid method relies more strongly on the smoothing method because the coarse spaces are chosen a priori. So, it is very important to develop new smoother methods, especially for those cases where the classical Gauss-Seidel smoothing method does not give good results. This paper
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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8. Existence and concentration of solutions for quasilinear Schrodinger equations / Existencia e concentração de soluções para equações de Schrodinger qase-lineares
In this work we study questions related with existence and concentration of positive solutions for some classes of quasilinear elliptic problems. To obtain our results we use a variational method that allows us to study solutions of the "single-peak" and "multiple-peak" type for a more general class of nonlinearities which do not satisfy necessarily the Ambr
Publicado em: 2010
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9. Instantonic methods for quantum tunneling in finite size
The instantonic approach for a Φ4 model potential is reexamined in the asymptotic limit. The path integral of the system is derived in semiclassical approximation expanding the action around the classical background. It is shown that the singularity in the path integral, arising from the zero mode in the quantum fluctuation spectrum, can be tackled only ass
Brazilian Journal of Physics. Publicado em: 2009-12
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10. Singular elliptic equations and free boundary problems / Equações elipticas singulares e problemas de fronteira livre
We study the equation -D.u = X{u>O} (log u+Àf(x, u)) in a smooth bounded domain fl C JRn, with boundary conditions u = O on 8fl. We obtain existence and regularity of the maximal solution. The positivity of such a solution depends on the parameter À and on the domain fl. .If the maximal solution vanishes on a set of positive measure, then we obtain local e
Publicado em: 2008
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11. SoluÃÃes globais e nÃo - globais de uma equaÃÃo parabÃlica nÃo - linear
We study the behaviour of solutions for the nonlinear heat equation with Dirichlet boundary conditions on a bounded subset of RN. We introduce the notion of weak solutions for this type of problem, and study the relation between such solutions and weak solutions for the associated stationary elliptic problem. Basic notions on Lebesgue spaces, Sobolev spaces,
Publicado em: 2008
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12. Partonic equation of state in relativistic heavy ion collisions
Recent results on chemical freeze-out, elliptic flow v2 and multi-strange hadron transverse momentum distributions are discussed and compared with model predictions. The idea of heavy flavor collectivity and light flavor thermalization is presented in the light of recent heavy flavor measurement at RHIC.
Braz. J. Phys.. Publicado em: 2007-06