Variational Method
Mostrando 13-24 de 88 artigos, teses e dissertações.
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13. Study of nonlinear vibration of Euler-Bernoulli beams by using analytical approximate techniques
In this paper, nonlinear responses of a clamped-clamped buckled beam are investigated. Two efficient and easy mathematical techniques called He's Variational Approach and Laplace Iteration Method are used to solve the governing differential equation of motion. To assess the accuracy of solutions, we compare the results with the Runge-Kutta 4th order. The res
Lat. Am. j. solids struct.. Publicado em: 2014-01
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14. Genetic algorithm and variational method to identify initial conditions: worked example in hyperbolic heat transfer
A identificação de condição inicial a partir de medidas de um dado período de tempo e um problema inverso difícil e pode ser aplicado para avaliar a robustez de estratégias de inversão. Questões científicas relevantes estão relacionadas ao contexto de estimar condições iniciais: cosmologia e assimilação de dados são dois bons exemplos. Dois m
TEMA (São Carlos). Publicado em: 08/11/2013
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15. Dynamical stability and parametrical vibrations of the laminated plates with complex shape
The problem of nonlinear vibrations and stability analysis for the symmetric laminated plates with complex shape, loaded by static or periodic load in-plane is considered. In general case research of stability and parametric vibrations is connected with many mathematical difficulties. For this reason we propose approach based on application of R-functions th
Lat. Am. j. solids struct.. Publicado em: 2013-01
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16. Resolvendo a equação de Schrödinger utilizando procedimentos numéricos fundamentais
A combination of the variational principle, expectation value and Quantum Monte Carlo method is used to solve the Schrödinger equation for some simple systems. The results are accurate and the simplicity of this version of the Variational Quantum Monte Carlo method provides a powerful tool to teach alternative procedures and fundamental concepts in quantum
Quím. Nova. Publicado em: 2012
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17. Numerical solution of the variational PDEs arising in optimal control theory
An iterative method based on Picard's approach to ODEs' initial-value problems is proposed to solve first-order quasilinear PDEs with matrix-valued unknowns, in particular, the recently discovered variational PDEs for the missing boundary values in Hamilton equations of optimal control. As illustrations the iterative numerical solutions are checked against t
Computational & Applied Mathematics. Publicado em: 2012
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18. 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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19. Mecanismo da decomposição e reações com radicais em acetatos / Decomposition mecanism and radical reactions with acetates
Computational studies on methyl and ethyl acetates molecules using ab initio and density functional calculations exploring the unimolecular mechanism, induced by multiphoton absorption, and the bimolecular reactions with OH and Cl radicals, have been performed in this work. Analysis of the calculated energy barriers and rate constants of unimolecular reactio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/05/2011
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20. THE HYBRID BOUNDARY ELEMENT METHOD BASED ON GENERALIZED WESTERGAARD STRESS FUNCTIONS / O MÉTODO HÍBRIDO DOS ELEMENTOS DE CONTORNO COM BASE EM FUNÇÕES DE TENSÃO DE WESTERGAARD GENERALIZADAS
A particular implementation of the hybrid boundary element method is presented for the two dimensional analysis of potential and elasticity problems, which although general in concept, is suited for fracture mechanics applications. Generalized Westergaard stress functions, as proposed by Tada et al in 1993, are used as the problem¿s fundamental solutions. T
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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21. Interação entre genes no modelo de spins e bósons / Gene interactions in the spin-boson model
Several functional modules in cells or bacteria are controlled by genes that regulate each other by coding repressive or inducer proteins. The understanding of these genetic networks is still an open problem in biology. In this work we apply the stochastic spin-boson model to the simplest interacting network, made of two genes, the first repressing the secon
Publicado em: 2011
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22. Um estudo variacionista de (z)inho na cidade de Uberlândia
Com a presente pesquisa realizamos uma análise descritiva de um fenômeno linguístico comum entre os falantes da cidade de Uberlândia, no Triângulo Mineiro, qual seja: a redução da estrutura (z)inho para (z)im (menininho meninim; cafezinho cafezim). Pautados pela metodologia variacionista realizamos entrevistas que tinham como objetivo não só buscar
Publicado em: 2011
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23. Variational calculation of low-energy positron life time in Xe atoms
The least-squares variational method (LSVM) is used for determining trial wavefunctions representing low-energy positron-xenon elastic scattering, which are used to determine the positron lifetime. The trial function is taken to depend on several adjustable parameters, and is improved iteratively by increasing the number of terms. The bound state wavefunctio
Brazilian Journal of Physics. Publicado em: 2010-03
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24. 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