电氧化甲酸反应体系的随机共振调制

Stochastic Resonance Under Modulation in a Model ofElectrooxidation of Formic Acid

采用甲酸电氧化的反应模型对随机共振的调制进行了研究．反应模型中有驱动电流和ＣＯ的饱和覆盖率两个控制参量．当弱信号和噪声同时作用于驱动电流时,固定信号强度,体系输出的脉冲间隔分布可以在合适的噪声强度时最有序,表明出现了随机共振现象．对ＣＯ的饱和覆盖率施加周期性信号的作用可以对随机共振行为进行调制,调制的结果取决于调制信号的周期及初相位．

Stochastic resonance(SR) is modulated in a model of electrochemical oxidation formic acid onPt. The driving current and the saturation coverage for carbon monooxide are two control parameters inthe model. When the driving current is perturbed by a period signal and noise, oscillations induced by noiseare observed near Hopf bifurcation point. The interspike distributions being the most order with the incre-ment of noise intensity indicates the occurrence of SR. The signal in the saturation coverage for carbonmonooxide may modulate the stochastic resonance. The initial phases and periods of the modulation signaldetermine the results of modulation.