Variational Principles
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Dynamics of rotating non-linear thin-walled composite beams: analysis of modeling uncertainties
In this article a non-linear model for dynamic analysis of rotating thin-walled composite beams is introduced. The theory is deduced in the context of classic variational principles and the finite element method is employed to discretize and furnish a numerical approximation to the motion equations. The model considers shear flexibility as well as non-linear
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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2. Sobre problemas de Ambrosetti-Prodi para sistemas elípticos com crescimento crítico unilateral / On Ambrosetti-Prodi type problems for elliptic systems with unilateral critical growth
Estudamos problemas do tipo Ambrosetti-Prodi para classes de sistemas elípticos gradientes com não-linearidades em crescimento crítico unilateral de Sobolev e de Trudinger-Moser. Com uso de métodos variacionais, provamos multiplicidade de solução para problemas homogêneos sem ressonância na parte linear e existência de solução não-trivial para pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/08/2010
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3. 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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4. Multiplicidade de soluções para sistemas gradientes semilineares ressonantes / Multiplicity of solutions for semilinear resonance gradient systems
Nesta tese lidamos com três classes de sistemas gradientes ressonantes. A primeira classe é um sistema com ressonância do tipo Landesman-Lazer. A segunda classe é um sistema fortemente ressonante enquanto a terceira classe é um sistema com ressonância no infinito e na origem. Analisamos as questões de existência e multiplicidade de soluções em cada
Publicado em: 2009
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5. Locatives and PPs in 15th century portuguese language: a movement research / Locativos e sintagmas preposicionados no português quatrocentista: um estudo do movimento
This research analyses the movement of prepositioned phrases (PPs), locative pronouns (Locs) and prepositioned locative pronouns (LocPs) in embedding structures of the 15th century Portuguese language, admitting that this period has variations which point to a grammar competition in Krochs (1989, 1994, 2003) framework. According to Martins (1994), Muidine (2
Publicado em: 2009
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6. SUBJECT IN PORTUGUESE pronominal URUGUAYAN The border region BRAZIL - URUGUAY / O sujeito pronominal no português uruguaio da região fronteiriça Brasil - Uruguai
In this research we study the behavior of the pronominal subject in the Uruguayan Portuguese language (PU) spoken in the border region between Brazil and Uruguay (Santana do Livramento-Rivera). Associating some assumptions from the Theory of Principles and Parameters (CHOMSKY, 1981), specifically the Null Subject Parameter (pro-drop), and from the Variationi
Publicado em: 2009
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7. Modelos constitutivos para materiais hiperelásticos: estudo e implementação computacional / Constitutive models for hyperelastic materials: study and computational implementation
The main objective of this work is to implement nonlinear hyperelastic constitutive models in a computational code of geometrically nonlinear analysis of shells. For this purpose, concepts of linear and tensor algebras, kinematics, strain, stress, balances, variational principles, numerical methods and hyperelasticity are necessary. Such program uses the pos
Publicado em: 2008
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8. Study of a class of quasilinear Schrodinger equation / Estudo de uma classe de equações de Schrodinger quase-lineares
In this work, we study questions related to existence, multiplicity and concentration behavior of standing waves, for a class of quasilinear Schrödinger equations, arising, for example, in Plasma Physics. To obtain our results, we use variational methods, such as, minimax theorems and also regularity theory of elliptic equations of second order
Publicado em: 2007
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9. A first-principles study of Cr impurities in iron
The first-principles molecular cluster discrete variational method (DV) is used to investigate the electronic structure and local magnetic properties of Cr impurities in bcc iron and Fe/Cr interfaces. The spin polarized case is considered within the framework of the local-spin-density approximation of the density function theory. The effect on the local mome
Brazilian Journal of Physics. Publicado em: 2006-12
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10. General variational principles applicable to the hybrid element method
Functional valued operators are used to formulate diffraction problems in a general abstract form. Variational principles for this formulation are developed. They are then applied to derive results on the linearized theory of free surface flows previously reported. Applications are also made to potential theory and elasticity.
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11. Theory of connectivity for formally symmetric operators
A previous paper introduced the notion of complete connectivity conditions and developed variational principles for diffraction problems subjected to such restrictions. Here, an abstract definition of formally symmetric operators is given and it is shown that the problem of connecting solutions of equations associated with this kind of operators leads to com
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12. Minimax Principles for the Solution of Semilinear Gradient Operator Equations in Hilbert Space
A new variational characterization of solutions for an important class of nonlinear operator equations is obtained. The result obtained is used to derive sharp necessary and sufficient conditions for the solvability of such operator equations. Examples of the applicability of the results obtained to nonlinear Dirichlet problems and global differential geomet