title: Waves of excitation on nonuniform membrane rings, caustics, and reverse involutes.
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.
authors.affiliation: Fachbereich Physikalische Chemie, Philipps Universitat Marburg, D-35032, Marburg/Lahn, Germany.
authors.forename: Attila
authors.initials: A
authors.lastname: Lazar
authors.forename: Horst-Dieter
authors.initials: HD
authors.lastname: Forsterling
authors.forename: Henrik
authors.initials: H
authors.lastname: Farkas
authors.forename: Peter
authors.initials: P
authors.lastname: Simon
authors.forename: Andras
authors.initials: A
authors.lastname: Volford
authors.forename: Zoltan
authors.initials: Z
authors.lastname: Noszticzius