Weakly Nonlinear Systems
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Gas de Bose diluido fracamente confinado / Dilute Bose gas weakly confined
A critical study of atomic Bose-Einstein condensates (BECs) is presented. Taking as a starting point the physics of the free gas, we study the effect of weakly confining potentials. Two cases were studied in detail: i) an atomic gas in a finite square well potential with a few bound states; and ii) a system confined in two-dimensions by an isotropic harmonic
Publicado em: 2010
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2. Sincronização de uma classe de sistemas não-lineares acoplados com aplicações em sistemas elétricos de potência / Synchronization of a class of coupled non-linear systems with applications in electric power systems
Synchronization of a class of coupled non-linear systems is studied in this work. From the theoretical point of view, we present synchronization results that provide sufficient conditions on the vector field and estimates of the coupling parameters that guarantee synchronization. Differently from the existing approaches in the nonlinear systems literature, o
Publicado em: 2008
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3. Análise de escala em bilhares com fronteiras móveis
We study numerically the scaling properties of some dynamical systems. Near the transition from the integrable to the non-integrable regime of complete e simplified versions of Fermi-Ulam model, we investigate the region of low energy (chaotic sea). We evaluate average quantities as functions (a) of the iteration number n or the time t, (b) of the initial ve
Publicado em: 2008
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4. Modelagem de Circuitos Fracamente Não-Lineares Utilizando Séries de Volterra
Os efeitos de distorções não-lineares em sistemas fracamente não-lineares eram avaliados empregando o método clássico de aproximação em séries de potência. Nos últimos anos, as não-linearidades inerentes aos dispositivos eletrônicos vêm sendo caracterizadas, com sucesso, utilizando o método Volterra. O objetivo do trabalho foi realizar um estu
Publicado em: 2005
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5. Uma contribuição ao estudo de sistemas dinamicos giroscopicos não-lineares
In this work one develops the study of the linear gyroscopic dynamical system of the conservative and of the dissipative kinds giving emphasis to the study of the stability of these systems as a important condition to the comprehension of the nonlinear gyroscopic system, the main goal of this work. In the study of the linear system one presents the mathemati
Publicado em: 2001
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6. Stochastic noise interferes coherently with a model biological clock and produces specific dynamic behaviour.
The influence of noise is unavoidable in all living systems. Its impact on a model of a biological clock, normally running in regular oscillating modes, is examined. It is shown that in a specific system in which endogenous rhythmicity is produced by a beat oscillator acting on a feedback coupled metabolic pool system, noise can act coherently to produce une
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7. A perturbed two-level model for exciton trapping in small photosynthetic systems.
The study of exciton trapping in photosynthetic systems provides significant information about migration kinetics within the light harvesting antenna (LHA) and the reaction center (RC). We discuss two random walk models for systems with weakly coupled pigments, with a focus on the application to small systems (10-40 pigments/RC). Details of the exciton trans