Elliptic Problem
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Espectro de Fuík e equações elípticas com não linearidade de salto / Fucik Spectrum and elliptic equations with jumping nonlinearities
We study the Fucik Spectrum for the Laplacian operator, that is, the set SIGMAof the couples (mü, nü) ARE THIS ESTA CONTAINEDR POT. 2, for which the problem { - DELTAu(x) = mü nüPOT. + (x); EPSILONOMEGA, Bu = 0; x EPSILONPARTIALOMEGA, admits a nontrivial solution, where OMEGAEPSILONR POT. nis a bounded domain, u POT. + (x) = max {0, u(x)}, u POT. -(x) =
Publicado em: 2010
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14. O problema de Dirichlet para a equação de hipersuperfície mínima em M x R com bordo assintótico prescrito
O objetivo central deste trabalho consiste em demonstrar a existência de gráficos mínimos C2,x com fronteira assintótica prescrita na variedade produto M R, onde M e completa, simplesmente conexa, com curvatura seccional KM satisfazendo KM ≤ -k2 < 0 e tal que, para algum p Є M, o subgrupo de isotropia de Iso(M) em p age de modo 2-pontos homogêneo nas
Publicado em: 2010
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15. Aplication of unscented transformed (ut) for design filters microwave / Aplicação da transformada de incerteza (ut) para projeto de filtros de microondas
The manufacture of complex filters and their tests depend on electromagnetic simulation for validation and correct analysis. However, in the filter assembly, the fabrication process introduces new sources of uncertainty that are difficult to model with the electromagnetic simulator. The result may be significant differences between the simulated responses an
Publicado em: 2010
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16. 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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17. O problema elÃptico com nÃo linearidade cÃncava-convexa
In this work, we study the existence of solutions for an elliptic problem with concave-convex nonlinearity in a regular and bounded domain. The first solution is obtained using the sub-super solutions method. We use the variational method, specifically the Mountain Pass Theorem to obtain a second solution
Publicado em: 2009
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18. Periodic solutions for nonlinear telegraph equationvia elliptic regularization
In this work we are concerned with the existence and uniqueness of T -periodic weak solutions for an initial-boundary value problem associated with nonlinear telegraph equations typein a domain . Our arguments rely on elliptic regularization technics, tools from classic
Computational & Applied Mathematics. Publicado em: 2009
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19. Orbitas periodicas em sistemas mecanicos / Periodic orbits in dynamical systems
In this work we study dynamical systems possessing Hamiltonian and time-reversible structures. The reversibility concept is de¯ned in terms of an involution. Initially we discuss the dynamics of Hamiltonian vector ¯elds with 2 and 3 degrees of freedom around an elliptic equilibrium in the presence of an involution which preserves the symplectic structure.
Publicado em: 2008
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20. 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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21. 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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22. Variação primeira e segunda para o primeiro autovalor de um problema elíptico / First and second variation of the first eigenvalue of an elliptic problem
Consideraremos o problema elípitco $-\Delta u + \alpha\chi_Du = \lambda u$ em $\Omega$, onde $\Omega$ é um domínio de R^n com fronteira regular, e $D\subset \Omega$ é um subconjunto fechado de medida de Lebesgue fixada. A motivação para este problema vem da Mecânica, onde esta equação é encontrada no estudo de vibrações de uma membrana composta.
Publicado em: 2007
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23. Irregular polygon partitioning on the biaxial ellipsoid on the surface of the Lambert azimuthal equal-area projection / DIVISÃO DE POLÍGONOS IRREGULARES DO ELIPSÓIDE BIAXIAL NA SUPERFÍCIE DA PROJEÇÃO AZIMUTAL EQUIVALENTE DE LAMBERT
This dissertation supplies the methodology of the measure (area) in the Earth model adopted for Geodesy. This model is the ellipsoid of revolution, in which the system of Cartesian coordinates, the curvilinear coordinate system and the polar coordinate system are described. The coordinate nature in the development of the surface measure calculation is discus
Publicado em: 2007
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24. Uniqueness and nondegeneracy for problems involving p-laplacian in annuli / Unicidade e não-degenerescencia para problemas envolvendo p-laplaciano em aneis
Neste trabalho estudamos a unicidade e a não-degenerescência de soluções positi-vas radiais para problemas não-autônomos envolvendo o p-Iaplaciano em anéis e bolas, com condição de Neumann na parte interna do anel, e condição de Dirichlet na parte externa. Quando o domínio é uma bola, temos apenas a condição de Dirichlet. Consideraremos três
Publicado em: 2005