介观振荡化学反应体系的内噪声随机共振

用化学Langevin方程研究了内噪声对介观振荡化学反应体系的影响.研究发现,在确定性体系处于定态条件下,内噪声可以导致体系振荡:随着内噪声强度的变化,诱导振荡信号的信噪比通过一个极大值,表明内噪声随机共振的出现;由于内噪声强度随着系统体积的变化而改变,因此,这一现象也证明了系统尺度共振,即最佳尺度效应的存在.

Internal Noise Stochastic Resonance in a Mesoscopic Oscillating Chemical Reaction System

The influence of internal noise on a mesoscopic oscillating chemical reaction system is numerically studied by using chemical Langevin equations. It is found that internal noise can induce reaction oscillations in the system when the corresponding deterministic system does not oscillate. With the change of the internal noise intensity,the signal|to|noise ratio of the noise|induced oscillation goes through a maximum,which shows the occurrence of internal noise stochastic resonance. Since the magnitude of the internal noise is changed %via% the variation of the system size,these phenomena also demonstrate a kind of system size resonance.