Biomedical subjects

F Marchesoni

Publications and source records attributed to F Marchesoni.

At least 19 recordsLinked to original sources

PubMed2000

Backward-to-forward jump rates on a tilted periodic substrate

Driven diffusion of a Brownian particle along a one-dimensional lattice is investigated numerically on decreasing its damping constant. The notions of multiple jumps, jump reversal, and backward-to-forward rates are discussed in detail. In particular, we conclude that in the underdamped limit backward jumps are suppressed relative to forward jumps more effectively than previously assumed. The dependence of such a drive-controlled mechanism on the damping constant and the temperature is interpreted analytically.

Journal Article↗

PubMed2000

Noise sustained propagation: local versus global noise

We expand on prior results on noise supported signal propagation in arrays of coupled bistable elements. We present and compare experimental and numerical results for kink propagation under the influence of local and global fluctuations. As demonstrated previously for local noise, an optimum range of global noise power exists for which the medium acts as a reliable transmission "channel." We discuss implications for propagation failure in a model of cardiac tissue, and present a general theoretical framework based on discrete kink statistics. Valid for generic bistable chains, the theory captures the essential features observed in our experiments and numerical simulations.

Journal Article↗

PubMed2000

Numerical verification of bona fide stochastic resonance

The notion of stochastic resonance as an input/output synchronization mechanism is reestablished quantitatively, based on accurate numerical simulation of a simple two-state model, namely, the Schmitt trigger. The corresponding phenomenological criterion known as bona fide stochastic resonance is thus proven applicable throughout the entire range of the input parameters. Claims to the contrary are briefly discussed.

Journal Article↗

PubMed1996