Control of spiral waves in excitable media
The propagation of spiral-shaped excitation waves is a prominent example of self-organization in nonequilibrium systems. The properties of these waves are studied in a chemical model system - the Belousov-Zhabotinsky (BZ) reaction - and in various biological excitable media such as heart or neuronal...
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| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Published: |
2018
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| Online Access: | https://repository.li.mahidol.ac.th/handle/123456789/16645 |
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| Institution: | Mahidol University |
| Summary: | The propagation of spiral-shaped excitation waves is a prominent example of self-organization in nonequilibrium systems. The properties of these waves are studied in a chemical model system - the Belousov-Zhabotinsky (BZ) reaction - and in various biological excitable media such as heart or neuronal tissue. An important aspect lies in finding tools for external control of these waves. A light-sensitive variant of the BZ reaction has proven to be a suitable system for investigating local and global control by means of a time-dependent uniform illumination. A local feedback control, in which short light pulses are applied at instants corresponding to the passage of a wave front through a measuring point, results in a drift of the spiral center along a discrete set of stable circular orbits. In a confined-domain control, where the illumination intensity is taken to be proportional to the average wave activity observed in a circular domain of the reaction layer, the stabilization and destabilization of spiral wave trajectories are demonstrated. The presented methods could be useful for the control of biological excitation waves. © 2004 Elsevier Inc. All rights reserved. |
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