Wave propagation in a medium with disordered excitability
The effect of quenched disorder on the propagation of autowaves in excitable media is studied both experimentally and numerically in relation to the light-sensitive Belousov-Zhabotinsky reaction. The spatial disorder is introduced through a random distribution with two different levels of transmitta...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1998 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/16977 |
| Acceso en línea: | https://hdl.handle.net/2117/16977 |
| Access Level: | acceso abierto |
| Palabra clave: | Waves Chemical waves Disorder Excitable media Belousov-Zhabotinsky reaction Ones Àrees temàtiques de la UPC::Física::Mecànica quàntica |
| Sumario: | The effect of quenched disorder on the propagation of autowaves in excitable media is studied both experimentally and numerically in relation to the light-sensitive Belousov-Zhabotinsky reaction. The spatial disorder is introduced through a random distribution with two different levels of transmittance. In one dimension the (time-averaged) wave speed is smaller than the corresponding to a homogeneous medium with the mean excitability. Contrarily, in two dimensions the velocity increases due to the roughening of the front. Results are interpreted using kinematic and scaling arguments. In particular, for d 2 we verify a theoretical prediction of a power-law dependence for the relative change of the propagation speed on the disorder amplitude. |
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