On-Uma Kheowan

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The dynamics of rigidly rotating spiral waves in a reaction layer with light-dependent excitability is studied by numerical integration of a reaction-diffusion equation system with a feedback control. The feedback signal is derived from sensory domains with different geometries by introducing an algorithm that computes the illumination intensity to be(More)
We characterize the spatiotemporal evolution of a photosensitive Belousov-Zhabotinsky medium that is made up of coupled oscillatory cells with randomly distributed frequencies. The medium evolves from an initial state of multiple wave sources to a synchronized state governed by a single wave source. The synchronization occurs via a competition between the(More)
During an experimental study of the resonance attractor for spiral waves in the light-sensitive Belousov-Zhabotinsky reaction, strong deviations of the attractor trajectories from circular orbits are observed if the time delay in the feedback loop becomes relatively long. A theory is developed that reduces the spiral wave dynamics under a long-delayed(More)
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