Chaotic Behavior In Systems
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Nonlinear dynamics of a SMA large-scale space structure
Large-scale structures are of special interest of aerospace applications, especially the ones involving smart materials. This paper deals with an archetypal system with two degrees of freedom that resembles the use of SMA elements as vibration isolation systems on a sparse aperture satellite array. The system has SMA elements in two perpendicular directions
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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2. Estudo do comportamento caótico e determinação de dimensão fractal em modelos pré-inflacionários não compactos / Study of chaotic behavior and determination of fractal dimension in noncompact preinflationary models
O caos determinístico é um dos aspectos mais interessantes no que diz respeito à teoria moderna dos sistemas dinâmicos, e está intrinsecamente associado a pequenas variações nas condições iniciais de um dado modelo. Neste trabalho, é feito um estudo acerca do comportamento caótico em dois casos específicos. Primeiramente, estudam-se modelos préi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/09/2011
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3. Sistemas complexos, séries temporais e previsibilidade / Complex systems, time series and predictability
Para qualquer sistema observado, físico ou qualquer outro, geralmente se deseja fazer predições para sua evolução futura. Algumas vezes, muito pouco é conhecido sobre o sistema. Se uma série temporal é a única fonte de informação no sistema, predições de valores futuros da série requer uma modelagem da lei da dinâmica do sistema, talvez não l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/02/2011
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4. Transição quântico-clássica em sistemas com propensão coletiva / Quantum-to-classical transition in systems with collective propensity
In this thesis, we studied the behavior of quantum systems which in the classical limit may exhibit either regular or chaotic behavior. Our study was based on the dynamical characterization of the, chaotic or regular, behavior of these systems in the classical limit through the analysis of the structure of phase-space distributions functions. Particularly, w
Publicado em: 2010
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5. Lavando a Alma: análise do contexto de uma sala de aula de língua inglesa de escola pública sob a luz da teoria do caos/complexidade. / Letting It All Out:analyzing an English classroom context in a state school based on chaos/complexity theory.
This research is an ethnographic case study that analyzes, in a descriptive form, the English language lessons in a second year high school classroom in a state school in the city of Goiânia. For this, we conducted a participant-observation research study, which, according to Spradley (1980), occurs when the researcher observes what happens in the research
Publicado em: 2010
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6. A multiparameter chaos control method applied to maps
Chaos is a kind of nonlinear system response that has a dense set of unstable periodic orbits (UPOs) embedded in a chaotic attractor. The idea of the chaos control is to explore the UPO stabilization obtaining dynamical systems that may quickly react to some new situation, changing conditions and their response. The OGY (Ott-Grebogi-Yorke) method achieves sy
Brazilian Journal of Physics. Publicado em: 2008-12
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7. Dinâmica oscilatória na eletrooxidação de etileno glicol / Oscillatory dynamics in the ethylene glycol electrooxidation reaction
In the present work were studied some nonlinear aspects of the catalytic oxidation of ethylene glycol (EG) on platinum electrodes in alkaline media (KOH). The systems dynamics was investigated by means of cyclic voltammetry, current and potential time series, and electrochemical impedance spectroscopy (EIS). The EIS results reveal the presence of a hidden ne
Publicado em: 2008
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8. Análise espectral de padrões-gradiente de séries temporais curtas / Gradient spectral analysis for short time series
With the modernization of data collecting technology, in the time series format, new methodological challenges, for analyzing and interpreting variability patterns, have been growing. In general, such challenges are due to several collecting data problems when they are under extreme environmental variations, data satellite transmission and other inherent ins
Publicado em: 2008
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9. Kinetic theory of Hamiltonian maps / Teoria cinética de mapas hamiltonianos
This work consists in the study of the transport properties of chaotic Hamiltonian systems by using projection operator techniques. Such systems can exhibit deterministic diffusion and display an approach to equilibrium. We show that this diffusive behavior can be viewd as a spectral property of the associated Perron-Frobenius operator. In particular, the le
Publicado em: 2007
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10. Comportamento complexo na formação de bolhas de ar em líquidos / Complex behaviour in air-liquid bubble formation
We have investigated the air bubble formation in viscous fluid with some control parameters. We have characterized the sistem using the air flow and the length of the hose that connects the air flow control system and the injector nozzle as control parameters. The hose corresponds to a system dissipative element. We have found period adding routes with and w
Publicado em: 2007
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11. Dissipação, termalização e descoerencia via acoplamento caotico / Dissipation, thermalization and decoherence through chaotic coupling
We study here how and under which conditions a chaotic system with only two degrees of freedom can produce irreversible phenomena such as dissipation, thermalization and, from the quantum point of view, decoherence in a simple system coupled to it. In the classical formulation of the problem, we describe analytically the behavior of the energy ux in Linear R
Publicado em: 2006
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12. Análise de métodos de agrupamento para o treinamento de redes neurais de base radical aplicadas à identificação de sistemas
For complex systems, modeling using basic laws to determine their dynamic behavior is not always possible. An alternative to solve these problems is use concepts of systems identification. Trough system identification it is possible to determine a mathematical model based on input and output data of the system. When little prior knowledge is available, it is
Publicado em: 2006