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)

Análisis organizacional del Partido de la Democracia Social Brasileña en el Estado de San Pablo (1988-2006)

The article represents a theoretical and methodological approach to the analysis of organizational dynamics of political parties today, based on a study of the Party of Brazilian Social Democracy (PSDB) in the State of Sao Pãulo (period between 1988 to 2006). It is hypothesized that the structure and the institutional rules of a particular party, or even their election results, are insufficient to explain the inner workings, such as the role of party organization in the electoral system. An approach that articulates the relationship patterns, election results and posts held in the party, identified the factors that explain the political capital that circulated within the party and ensured its organizational dynamics over the period analyzed.

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.

O Partido dos Trabalhadores e os núcleos de base

Pós-graduação em Ciências Sociais - FFC

O programa político do Partido dos Trabalhadores no contexto de uma Esquerda em crise

Pós-graduação em Ciências Sociais - FFC

A crise orgânica do Partido Comunista Brasileiro (PCB) e o declínio do socialismo real

Pós-graduação em Ciências Sociais - FFC

A metamorfose da atuação política do Partido dos Trabalhadores 1987-1991

Pós-graduação em Ciências Sociais - FFC

A questão democrática no contexto da crise orgânica do partido comunista brasileiro (PCB): 1979-1987

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Da transformação ao gerencialismo: as metamorfoses da concepção de participação popular no Partido dos Trabalhadores (1988-2004)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Autonomia pela assertividade: a política externa brasileira do Partido dos Trabalhadores (2003-2010)

Pós-graduação em Ciências Sociais - FFC

Concepção e papel da política em Karl Marx: uma perspectiva possível do Manifesto do Partido Comunista à Comuna de Paris

Pós-graduação em Ciências Sociais - FFC

Carta capital e Veja: a cobertura do discurso ecológico-político do Partido Verde na eleição presidencial de 2010

Pós-graduação em Comunicação - FAAC

Análise das mensagens postadas por Marina Silva e pelo Partido Verde no twitter nas eleições de 2010

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)