Levy Walk
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Superdifusão de caminhadas markovianas e não-markovianas. / Superdifusion of marcovian na non-marcovian walk.
Random walks are tools used in statistical physics to quantitatively describe the evolution of dynamical systems. Such systems are ubiquitous in Nature and each system requires a unique approach. Models of the motion of biological organisms are constructed based on the randomness observed in search strategies. Markovian models attempt to faithfully reproduce
Publicado em: 2010
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2. Statistical aspects in dynamics search in scarce environments. / Aspectos estatísticos em dinâmica de busca em ambientes escassos.
Neste trabalho, analisamos a dinâmica de busca e propriedades estatísticas de um organismo buscador (searcher) à procura de um alvo de interesse (target). De forma geral, muitos são os aspectos de interesse nesse tipo de estudo. Por exemplo, se pensarmos no contexto biológico, temos que na natureza constantemente organismos interagem uns com os outros,
Publicado em: 2009
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3. Random walks with self-similar clusters
We construct a random walk on a lattice having a hierarchy of self-similar clusters built into the distribution function of allowed jumps. The random walk is a discrete analog of a Lévy flight and coincides with the Lévy flight in the continum limit. The Fourier transform of the jump distribution function is the continuous nondifferentiable function of Wei
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4. Helical Lévy walks: Adjusting searching statistics to resource availability in microzooplankton
The searching trajectories of different animals can be described with a broad class of flight length (lj) distributions with P(lj) = lj–μ. Theoretical studies have shown that changes in these distributions (i.e., different μ values) are key to optimizing the long-term encounter statistics under certain searcher–resource scenarios. In particular, they p
National Academy of Sciences.
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5. Anomalous diffusion of water in biological tissues.
This article deals with the characterization of biological tissues and their pathological alterations. For this purpose, diffusion is measured by NMR in the fringe field of a large superconductor with a field gradient of 50 T/m, which is rather homogenous and stable. It is due to the unprecedented properties of the gradient that we are able not only to deter
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6. E. coli Superdiffusion and Chemotaxis—Search Strategy, Precision, and Motility
Escherichia coli motion is characterized by a sequence of consecutive tumble-and-swim events. In the absence of chemical gradients, the length of individual swims is commonly believed to be distributed exponentially. However, recently there has been experimental indication that the swim-length distribution has the form of a power-law, suggesting that bacteri
The Biophysical Society.