Bifurcation Analysis of a Van der Pol-Duffing Circuit with Parallel Resistor

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Effective Fokker-Planck equation for birhythmic modified van der Pol oscillator

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

One-dimensional Fermi accelerator model with moving wall described by a nonlinear van der Pol oscillator

A modification of the one-dimensional Fermi accelerator model is considered in this work. The dynamics of a classical particle of mass m, confined to bounce elastically between two rigid walls where one is described by a nonlinear van der Pol type oscillator while the other one is fixed, working as a reinjection mechanism of the particle for a next collision, is carefully made by the use of a two-dimensional nonlinear mapping. Two cases are considered: (i) the situation where the particle has mass negligible as compared to the mass of the moving wall and does not affect the motion of it; and (ii) the case where collisions of the particle do affect the movement of the moving wall. For case (i) the phase space is of mixed type leading us to observe a scaling of the average velocity as a function of the parameter (χ) controlling the nonlinearity of the moving wall. For large χ, a diffusion on the velocity is observed leading to the conclusion that Fermi acceleration is taking place. On the other hand, for case (ii), the motion of the moving wall is affected by collisions with the particle. However, due to the properties of the van der Pol oscillator, the moving wall relaxes again to a limit cycle. Such kind of motion absorbs part of the energy of the particle leading to a suppression of the unlimited energy gain as observed in case (i). The phase space shows a set of attractors of different periods whose basin of attraction has a complicated organization. © 2013 American Physical Society.

Reconhecimento ético em Hegel à luz do conceito de família

Pós-graduação em Filosofia - FFC

A história em revistas: periodismo cultural e conhecimento histórico no Rio de Janeiro oitocentista

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo das alterações linfocitárias CD4/CD8 e carga viral em pacientes co-infectados HIV/Mycobacterium tuberculosis associadas a frequência de mutações na região Pol do HIV-1

Pós-graduação em Biociências e Biotecnologia Aplicadas à Farmácia - FCFAR

A competência informacional de graduandos de biblioteconomia da região sudeste: um enfoque nos processos de busca e uso ético da informação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ciclos limites e a equação de van der Pol

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Serviço social e assistência social: cidadania e projeto ético-político

Pós-graduação em Serviço Social - FCHS

Análise da direção ético política do Assistente Social na perspectiva do projeto hegemônico profissional

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ciência, técnica e periodismo no Rio de Janeiro (1808-1852)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O cientificismo como obstáculo à compreensão ético-política da Psicologia

In separating the phenomena of their social, human, and ecological contexts, and by not taking into account intentional and valorative categories, natural-scientific methodologies impede the comprehension of some human activities which include values, chiefly ethical and political. In this context, scientism is the dogmatic and non-thematized acceptance of natural-scientific methods. From this point on, in the context of psychology, the aim of this paper is to demonstrate how scientism can function as an epistemological and methodological obstacle to an ethical and political understanding of psychology. Thus, at first, through reflections based on problems encountered in the literature on the subject, scientism's dogmas and some counterpoints are presented; some of its consequences are addressed, by taking up two examples from current literature - the labeling and the racial interpretations, and, finally, a program of research which deals with these problems is presented as an alternative: critical psychology.

A sociabilidade do capital e o gerenciamento da questao social: o projeto ético-político profissional no cotidiano do assistente social

Pós-graduação em Serviço Social - FCHS

Serviço social e projeto ético-político profissional: contributos da extensão universitária

Pós-graduação em Serviço Social - FCHS

O sentido ético da dramática de si e o significado político da poética da diferença na pragmática do ensino: considerações à luz de Foucault

This essay discusses the theme of poetics in teaching activity, and discusses its possible ability to think about the ethical-formative sense and its possible political use to propose alternatives to the educational praxis that is restricted, in actuality, a pragmatic teaching. From the point of view of aesthetics of existence, therefore, we proposes a particular notion of poetic, fairly close to what can be understood by the dramatic that underlies the pragmatic of you last Foucault, as well as analyzes your chances to problematize the current pragmatic teaching. Thus, we look forward to assist the educator thinking both the possibility of ethics (self) transformation as the meaning of formation of another in his educational activity.