Chin. Phys. B ›› 2014, Vol. 23 ›› Issue (1): 10502-010502.doi: 10.1088/1674-1056/23/1/010502
王康康a b, 刘先斌a
Wang Kang-Kang (王康康)a b, Liu Xian-Bin (刘先斌)a
摘要: We investigate the stochastic resonance (SR) phenomenon induced by the periodic signal in a metapopulation system with colored noises. The analytical expression of signal-to-noise is derived in the adiabatic limit. By numerical calculation, the effects of the addictive noise intensity, the multiplicative noise intensity and two noise self-correlation times on SNR are respectively discussed. It shows that: (i) in the case that the addictive noise intensity M takes a small value, a SR phenomenon for the curve of SNR appears; however, when M takes a large value, SNR turns into a monotonic function on the multiplicative noise intensity Q. (ii) The resonance peaks in the plots of the multiplicative noise intensity Q versus its self-correlation time τ1 and the addictive noise intensity M versus its self-correlation time τ2 translate in parallel. Meanwhile, a parallel translation also appears in the plots of τ1 versus Q and τ2 versus M. (iii) The interactive effects between self-correlation times τ1 and τ2 are opposite.
中图分类号: (Fluctuation phenomena, random processes, noise, and Brownian motion)