We discuss properties of a cross junction composed of active areas, in which the Belousov-Zhabotinsky reaction proceeds, and passive stripes. The response of such a junction with respect to pulses of excitation arriving from perpendicular directions is studied. It is shown that the device works as a coincidence detector because the second pulse is stopped if it arrives earlier than a certain characteristic time after the first one. Using the Rovinsky-Zhabotinsky model, we calculate the size of the cross junction and specify its temporal characteristics. We suggest how the cross junction can work as a switch of a chemical signal.

We show that a passive barrier separating two excitable chemical media can work as a transformer for a frequency of a train of pulses. The results of calculations performed for the FitzHugh-Nagumo type model and for the Rovinsky-Zhabotinsky model of the Belousov-Zhabotinsky reaction are discussed. Using the Rovinsky-Zhabotinsky model, we estimate the range of barrier widths and the range of frequencies of incoming pulses for which the transforming properties may be observed.

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