Bifurcation Analysis
Mostrando 25-36 de 60 artigos, teses e dissertações.
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25. The Conley index for discontinuous vector fields / O indice de Conley para campos de vetores descontinuos
The Conley index is a used as a topological invariant in the analysis of the qualitative behavior of dynamical systems. lnitially the theory was developed for continuous flows in finite dimensional spaces and later extended to the infinite dimensional setting as well as to the discrete case. ln this work, we present a Conley index theory for a class of disco
Publicado em: 2008
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26. Bifurcation analysis of the Watt governor system
This paper pursues the study carried out by the authors in Stability and Hopf bifurcation in the Watt governor system [14], focusing on the codimension one Hopf bifurcations in the centrifugal Watt governor differential system, as presented in Pontryagin's book Ordinary Differential Equations, [13]. Here are studied the codimension two and three Hopf bifurca
Computational & Applied Mathematics. Publicado em: 2007
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27. Bifurcação de Hopf generalizada para um sistema planar suave por partes
In this work we use the qualitative theory of the di?erential equations to quickly study the Hopf bifurcation for a smooth planar dynamical system under the variation of the control parameter of the system, and a generalized Hopf bifurcation emanated from a corner for piecewise smooth planar dynamical system, about the generation of a branch of periodic orbi
Publicado em: 2007
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28. Comparação entre a ultra-sonografia e a ressonância magnética do abdome na avaliação da morbidade na esquistossomose mansônica
There is no study comparing ultrasonography (US) to magnetic resonance imaging (MRI) in the evaluation of liver disease in patients with schistosomiasis mansoni, except for case reports. This study compared US and MRI of the abdomen in the evaluation of morbidity in schistosomiasis mansoni. Sixty patients (age 42,1 ± 13,4 years), attending the Hospital das
Publicado em: 2007
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29. Applied nonlinear dynamics of non-smooth mechanical systems
This paper introduces practically important concept of local non-smoothness where any dynamical system can be considered as smooth in a finite size subspace of global hyperspaceomega. Global solution is generated by matching local solutions obtained by standard methods. If the dynamical system is linear in all subspaces then an implicit global analytical sol
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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30. Aplicação da descrição cinemática co-rotacional na análise não-linear geométrica de estruturas discretizadas por elementos finitos de treliças, vigas e cascas / The application of the co-rotational kinematic description to the geometrically non-linear analysis of structures modeled by truss, beam and shell finite elements
The co-rotational formulation was used as the kinematic description to evaluate the geometrically non-linear behavior of different types of structures on a static analysis. Along the current research, it was aimed to demonstrate the basic concepts of the co-rotational approach that is based on the separation of the total motion into rigid body and deformatio
Publicado em: 2006
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31. THE CONTRIBUTION AND DEVELOPMENT OF THE ENGLISH SCHOOL OF INTERNATIONAL RELATIONS / A CONTRIBUIÇÃO E O DESENVOLVIMENTO DA ESCOLA INGLESA DE RELAÇÕES INTERNACIONAIS
The aim of this dissertation is to evaluate the contribution and the development of the English School of International Relations. In order to achieve this, the analytical axis will be historic, emphasising a chronological approach. In this sense, it was accessed the contribution of two of its leading theorists: Martin Wight and Hedley Bull, that together es
Publicado em: 2003
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32. Application of the center manifold theory to the study of slewing flexible Non-ideal structures with nonlinear curvature: a case study
In this paper is Analyzed the local dynamical behavior of a slewing flexible structure considering nonlinear curvature. The dynamics of the original (nonlinear) governing equations of motion are reduced to the center manifold in the neighborhood of an equilibrium solution with the purpose of locally study the stability of the system. In this critical point,
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-07
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33. The effect of the therapeutical ultrasound in the treatment of the injuries for crushing of the ciático nerve of rats / Os efeitos do ultra-som terapêutico no tratamento das lesões por esmagamento do nervo ciático de ratos
An experimental study of the influence of therapeutic ultrasound on the regeneration of the sciatic nerve submitted to controlled crush injury was carried out in rats. Twenty female Wistar rats weighing 250 g on average were used and distributed in two groups according to the procedure: 1) crush injury only, ten rats; 2) crush injury followed by ultrasound i
Publicado em: 2002
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34. A new approach to evaluate imperfection sensitivity in asymmetric bifurcation buckling analysis
A direct procedure for the evaluation of imperfection sensitivity in bifurcation problems is presented. The problems arise in the context of the general theory of elastic stability for discrete structural systems, in which the energy criterion of stability of structures and the total potential energy formulation are employed. In cases of bifurcation buckling
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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35. Aplicação de dispositivos FACTS para o amortecimento de oscilações eletromecanicas de baixa frequencia em sistemas de energia eletrica
In this work, the influence of two FACTS devices, the Tiristor Controlled Series Compensator (TCSC) and the Static VAr Compensator (SVC), on power systems low frequency electromechanical oscillations damping, is analyzed by modal analysis, including critical eigenvalues identification and bifurcation analysis. A Power Sensitivity Model is used to represent a
Publicado em: 2001
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36. Adaptação da margem coronaria das membranas utilizadas nos procedimentos de regeneração tecidual guiada : avaliação "in vitro"
o objetivo deste estudo foi avaliar a adaptaçãodas membranas utilizadas nos procedimentos de Regeneração Tecidual Guiada, sobre a superfície radicular dos molares. Foram utilizados 100 molares: 50 primeiros molares inferiores e 50 primeiros molares superiores, extraídos de pacientes adultos. Após a extração estes dentes foram instrumentados e cada d
Publicado em: 2001