Energetics of stochastic resonance

Peter Jung and Fabio Marchesoni

The authors discuss the motion of a Brownian particle in a double-well potential driven by a periodic force in terms of energies delivered by the periodic and the noise forces and energy dissipated into the viscous environment. The authors show that, while the power delivered by the periodic force to the Brownian particle is controlled by the strength of the noise, the power delivered by the noise itself is independent of the amplitude and frequency of the periodic force.

Chaos 21, 047516 (2011)

Sensory coding in oscillatory electroreceptors of paddlefish

Alexander B. Neiman and David F. Russell2

The authors characterized the linear and nonlinear response properties of Lorenzinian ampullary electroreceptors (ERs) of live paddlefish, and their encoding of various kinds of time-varying stimuli, ranging from artificial broad-band Gaussian noise to natural waveforms recorded from zooplankton prey.

Chaos 21, 047505 (2011)
Read the press releases: phyorg.com | Physics News Highlights.

Effects of thermal gradients on the intensity of vortices generated in a cylindrical annulus

M. C. Navarro and H. Herrero

The authors have studied the influence of temperature gradients on the intensity of dust-devil-like vertical vortices in a cylindrical annulus. Increasing the temperature gradients intensifies the strength of the vortical structures developed while decreasing the gradients leads to weaker vortices or, in some cases, can even make them disappear.

Chaos 21, 043132 (2011)

Applying snapback repellers in resource budget models

Shu-Ming Chang and Hsun-Hui Chen

This work presents mathematical viewpoints and numerical analysis on Satake’s generalized resource budget model to rigorously prove that the generalized resource budget model is chaotic in Devaney’s sense by using the snapback repeller theory and the topological entropy theory.

 

Chaos 21, 043126 (2011)

Chaotic phase synchronization in a modular neuronal network of small-world subnetworks

Haitao Yu, Jiang Wang, Qiuxiang Liu, Jinxin Wen, Bin Deng, and Xile Wei

A transition to mutual phase synchronization takes place on the bursting time scale of coupled oscillators, while on the spiking time scale, they behave asynchronously. It is shown that this bursting synchronization transition can be induced not only by the variations of inter- and intra-coupling strengths but also by changing the probability of random links between different subnetworks.

Chaos 21, 043125 (2011)

Unexpected light behaviour in periodic segmented waveguides

Pierre Aschiéri and Valérie Doya

Numerical wave analysis reveals that structures of quantum phase space of periodic segmented waveguides (PSW) are similar to Poincaré sections which display a mixed phase space where stability islands are surrounded by a chaotic sea.

Chaos 21, 043118 (2011)

Finding communities in weighted networks through synchronization

Xuyang Lou and Johan A. K. Suykens

Community detection in weighted networks is an important challenge. In this paper, a local weight ratio scheme for identifying the community structures of weighted networks is introduced within the context of the Kuramoto model by taking into account weights of links.

Chaos 21, 043116 (2011)

Understanding the complexity of the Lévy-walk nature of human mobility with a multi-scale cost/benefit model

Nicola Scafetta

Human motion is a particular type of recurrent diffusion process where agents move from a location to another and return home after a given complex trajectory made of a certain number of displacement steps of given lengths. Understanding the statistical nature of human motion is the topic of the present work.

Chaos 21, 043106 (2011)

Plykin type attractor in electronic device simulated in MULTISIM

Sergey P. Kuznetsov

A main practical advantage of electronic devices of this kind is their structural stability that means insensitivity of the chaotic dynamics in respect to variations of functions and parameters of elements constituting the system as well as to interferences and noises.

Chaos 21, 043105 (2011)

Lagrangian coherent structures are associated with fluctuations in airborne microbial populations

P. Tallapragada, S. D. Ross, and D. G. Schmale, III

An analysis of the finite-time Lyapunov exponent field for periods surrounding 73 individual flight collections of Fusarium showed a relationship between punctuated changes in concentrations of Fusarium and the passage times of LCSs, particularly repelling LCSs. This work has implications for understanding the atmospheric transport of invasive microbial species into previously unexposed regions and may contribute to information systems for pest management and disease control in the future.

Read the press release.

Chaos 21, 033122 (2011)