title: Noise-enhanced phase locking in a chemical oscillator system.
abstract: Dynamical responses of a chemical oscillator to an external electric field were investigated in the Belousov-Zabotinsky reaction system with the catalyst Ru(bpy)(3)(2+) [tris-(2,2(')-bipyridine) ruthenium (II)] immobilized in cation exchange beads. Periodic forcing above the threshold induced phase locking, whose synchronization region has a shape similar to the Arnold tongue. When a certain amount of noise together with a subthreshold periodic signal was imposed on the chemical oscillator, 1:1 phase locking to the periodic signal occurred. Its degree passed through a maximum with increase in the noise intensity, a manifestation of stochastic resonance in the form of noise-enhanced phase locking. The experimentally observed features were reproduced in a numerical simulation with a forced Oregonator reaction-diffusion model.
authors.affiliation: Department of Applied Physics, Fukuoka University, Fukuoka 814-0180, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Miyakawa
authors.forename: Hironobu
authors.initials: H
authors.lastname: Isikawa