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Waves of excitation on nonuniform membrane rings, caustics, and reverse involutes
Attila Lazar1, Horst-Dieter Forsterling, Henrik Farkas
1Fachbereich Physikalische Chemie, Philipps Universitat Marburg, D-35032, Marburg/Lahn, Germany.
Abstract:
Chemical wave experiments on concentric nonuniform membrane rings are presented together with their theoretical description. A new technique is applied to create a slow inner and a fast outer zone in an annular membrane. An abrupt qualitative change of the wave profile was observed while decreasing the wave velocity in the inner zone. This phenomenon and all the experimental wave profiles can be adequately described by assuming that waves are involutes of a relevant caustic. A possible connection with recent models of atrial flutter is also set forth. (c) 1997 American Institute of Physics.
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