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Most phenomena observed in this system consists of globally synchronized temporal oscillations with no spatial structure. When spatial patterns are observed, they typically take the form of wavefronts which propagate across the ring or standing waves in which two parts of the rings oscillate out of phase with one another.

A more complex spatio-temporal pattern which we have observe is a temperature pulse which rotate around the ring-shaped catalyst. Unlike propagating fronts, which travel around the ring in both directions, pulse fronts p ropagate in only one direction.

Two different types of pulses have been seen in this system.

. Uniform - Spontaneous, transient pulses on a spatially uniform catalyst
. Non-uniform - Robust pulses on a spatially non-uniform catalyst

Surko Group: UC San Diego - Department of Physics