Experimental Investigation of Resonant Activation

Resonant activation of population extinctions.

Understanding the mechanisms governing population extinctions is of key importance to many problems in ecology and evolution. Stochastic factors are known to play a central role in extinction, but the interactions between a population's demographic stochasticity and environmental noise remain poorly understood. Here we model environmental forcing as a stochastic fluctuation between two states, ...

Experimental and theoretical investigation of molecular field effects by polarization-resolved resonant inelastic x-ray scattering

Investigation of random lasers with resonant feedback

Y. Ling, H. Cao,* A. L. Burin, M. A. Ratner, X. Liu, and R. P. H. Chang Department of Physics and Astronomy, Materials Research Center, Northwestern University, Evanston, Illinois 60208-3112 Department of Chemistry, Materials Research Center, Northwestern University, Evanston, Illinois 60208-3113 Department of Materials Science and Engineering, Materials Research Center, Northwestern University...

Stochastic resonance vs. resonant activation

– The phenomenon of stochastic resonance by which it is possible to boost the transduction of information by tuning into noise is experimentally and numerically contrasted with the phenomenon of resonant activation, i.e. the occurrence of a minimal, averaged residence time at an optimal time-scale in the presence of barrier modulations. The experimental system consists of a periodically modulat...

Resonant Activation in Asymmetric Potentials

The resonant activation effect (RA) has been well studied in different ways during the last two decades. It consist in the presence of a minimum in the mean time spent by a Brownian particle to exit from a potential well in the presence of a fluctuating force, as a function of the mean frequency (or the correlation time) of the latter. In the present work it is studied the role played by the as...