Random Walker Model
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Expoente de Hurst e diagrama de fase para persistência induzida amnesticamente em processos não-markovianos. / Hurst exponent and the phase diagram for persistence induced amnestic on a non-Markovian
Nowadays there has been a growing interest in anomalous diffusion: the super difusive and sub-difusive processes. The problem about normal diffusion already well established whereas many problems still exist in anomalous diffusion. Several mathematical models and computational techniques have been developed to model such processes. In this work we studied a
Publicado em: 2009
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2. Modelagem e medições de ondas de rádio para predição de perda de propagação em ambientes urbanos
Nesta tese novos modelos de predição de perda de percurso de propagação são propostos a partir de técnicas de otimizações recentes e de medições de níveis de potências obtidas para as áreas urbana e suburbana de Natal, cidade do Nordeste Brasileiro. Estes novos modelos são: (i) um modelo estatístico que foi implementado baseado na adição de
Publicado em: 2006
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3. Analytical results for the statistical distribution related to a memoryless deterministic walk: Dimensionality effect and mean-field models / "Resultados analíticos para as distribuições estatísticas relacionadas à caminhada determinista do turista sem memória: efeito da dimensionalidade do sistema e modelos de campo médio".
Consider a medium characterized by $N$ points whose coordinates are randomly generated by a uniform distribution along the unitary edges of a $d$-dimensional hypercube. A walker leaves from each point of this disordered medium and moves according to the deterministic rule to go the nearest point which has not been visited in the preceding $mu$ steps. This pr
Publicado em: 2004
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4. Variable survival exponents in history-dependent random walks: hard movable reflector
We review recent studies demonstrating a nonuniversal (continuously variable) survival exponent for history-dependent random walks, and analyze a new example, the hard movable partial reflector. These processes serve as simplified models of infection in a medium with a history-dependent susceptibility, and for spreading in systems with an infinite number of
Brazilian Journal of Physics. Publicado em: 2003-09
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5. Phase transition versus disorder: A criterion derived from a two-dimensional dynamic ferromagnetic model
The dynamical equations for spin correlation functions for the two-dimensional Ising model are discussed for rapid-quench conditions. The temperature of the bath in which the Ising spins are immersed is postulated to be driven by the hyperbolic cooling program T-1 = T0-1 + bt (T0 being the initial temperature, t the time, and b a constant). It is shown that