✦ LIBER ✦

Compound rotation of spiral waves in active media with periodically modulated excitability

✍ Scribed by M. Braune; H. Engel

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 479 KB
Volume: 211
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)80139-g

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✦ Synopsis

The dynamics of spiral waves under external modulation of excitability is studied experimentally in a light-sensitive convection-free Belousov-Zhabotinsky medium. When varying the intensity of applied illumination periodically, the experiments reveal strong dependence of the resulting trajectories of the spiral's tip on the modulation period. With appropriate periodic modulation it is possible to force a meandering spiral wave into the regime of circular (rigid) rotation. The experimental results are discussed in the framework of the kinematical theory of spiral waves.

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Entrainment and resonance of spiral wave

Entrainment and resonance of spiral waves in active media with periodically modulated excitability

✍ M. Braune; A. Schrader; H. Engel 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 513 KB

We study frequency locking and resonance of spiral waves in an active medium subjected to periodic forcing with adjustable frequency. The experiments are carried out with a modified Belousov-Zhabotinsky system whose excitability is light-sensitive. In the meander regime of compound rotation we find