Euler Lagrange Equation
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Braquistócrona na esfera
Abstract O problema consiste em determinar a trajetória (entre dois pontos dados) de menor tempo de um corpo, que parte do repouso, restrito a se mover numa superfície esférica e sujeito a um campo gravitacional constante. Através da equação de Euler-Lagrange, obtém-se uma expressão para o tempo total de percurso. O problema foi resolvido numericamen
Rev. Bras. Ensino Fís.. Publicado em: 22/07/2019
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2. Near the resonance behavior of a periodicaly forced partially dissipative three-degrees-of-freedom mechanical system
Abstract In this paper, a nonlinear three-degrees-of-freedom dynamical system consisting of a variable-length pendulum mass attached by a massless spring to the forced slider is investigated. Numerical solution is preceded by application of Euler-Lagrange equation. Various techniques like time histories, phase planes, Poincaré maps and resonance plots are
Lat. Am. j. solids struct.. Publicado em: 14/06/2018
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3. Flutter Instability of Timoshenko Cantilever Beam Carrying Concentrated Mass on Various Locations
Abstract This paper presents effects of shear deformation on flutter instability of cantilever beam subject to a concentrated follower force. The discrete form of equation of motion is formulated based on the Lagrange. In the presented formulation, the beam is modeled using Timoshenko beam theory, and constant shear distribution through the thickness of the
Lat. Am. j. solids struct.. Publicado em: 2016-12
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4. Modelos variacionais em processamento de imagens - formulação primal e dual / Variational models in image processing - primal and dual formulation
Neste trabalho apresentamos alguns problemas de processamento de imagens cujas formulações são variacionais. Para exemplificar estas formulações consideramos o modelo proposto pelos autores Rudin, Osher e Fatemi (ROF) para o problema de remoção de ruídos. Para um melhor entendimento do problema alguns conceitos do Cálculo Variacional, em especial as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/08/2011
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5. 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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6. Um estudo sobre a minimização de funcionais de expoente variável aplicados à restauração de imagens digitais / An study over the minimization of functionals of exponent variable applied to the restauration from digital images
Estuda-se neste trabalho um funcional com expoente variável, ou seja, com 1 ≤ p(x) ≤ 2, o qual fornece um modelo para a restauração de imagens digitais, mais precisamente para a remoção de ruídos. A difusão resultante do modelo proposto é uma combinação da Variação Total com a difusão isotrópica. A existência, unicidade e o comport
Publicado em: 2009
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7. Introduction to the ordinary differential equation in the framework of Colombeaus tempered generalized functions / Introdução às equações diferenciais ordinárias no contexto das funções generalizadas temperadas de Colombeau
The objective of this work is to study, under which conditions, the initial value problem associated with a first-order ordinary differential equation, in the framework of Colombeaus tempered generalized functions, it admits at least one (or only one) generalized solution or generalized tempered solution. For this purpose we studied some properties of the ge
Publicado em: 2008
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8. Grupos pseudo-livres, primos seguros e criptografia RSA
When a cryptographic scheme is defined over a group, encrypting messages is equivalent to assigning values in this group to variables of some equation, whereas breaking this scheme is âto discoverâ which values were assigned to those variables. Therefore, the security of such schemes is connected to the hardness to solve equations over groups. The use of f
Publicado em: 2007
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9. Harmonic mappings and martingales in manifolds / Aplicações harmonicas e martingales em variedades
In this work we explore results of harmonic mappings, via stochastic calculus in manifolds. The text is organized as follows: In the first two chapters, we introduce concepts and results about stochastic calculus in Rn, differential geometry and Lie groups. In the third chapter we have the definitions of harmonic mappings and the Euler-Lagrange equation. Fin
Publicado em: 2005
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10. Dinâmica e controle de movimento de corpo rígido de um manipulador robótico rígido/flexivel / Dynamic and control of rigid body motion of a rigid/flexible robotic manipulador
This work presents a study of the dynamics and control of the movement of rigid body of a robotic manipulator. The model of the manipulator, consisting of a mechanism with two flexible links hardwired by meetings that do not suffer deformations, was gotten through the Formularization of Lagrange and the Admitted Modes Method. For matching effect, two other m
Publicado em: 2001
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11. Characterizing harmonic immersions of surfaces with indefinite metric
Harmonic maps X:(S,h) → N from a 2-manifold S with indefinite metric h to a semi-Riemannian manifold N are characterized, assuming that the induced metric I is nondegenerate. Except in one very special case, the characterizations involve a canonically determined holomorphic quadratic differential on a naturally chosen conformal structure. This is surprisin
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12. Deduction of Semi-Optimal Mollifier for Obtaining Lower Bound for N0(T) for Riemann's Zeta-Function
A mollifier played a key role in showing N0(T) > 1/3N(T) for large T in ref. 1 [Levinson, N. (1974) Advan. Math. 13, 383-436]. A basic problem in ref. 1 was that of obtaining an upper bound for a sum of two terms, one larger than the other. Here a deductive procedure is given for finding a mollifier that actually minimizes the larger term. An Euler-Lagrange