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Fig. 5.3 Change of the vibrational mode of the photosensitive Belousov-Zhabotinsky medium (a)
under light irradiation (b)
At the same time, the evolution of the initial distribution of concentrations can be
altered by affecting the environment by different physical and chemical control
stimuli and (or) designing media with complex structure. All this leads to a
manifold increase in the information capabilities of reaction-diffusion media.
5.1.3 Visualizing (Deriving) the Results of the Problem
Solution
In order to derive results of the problem solution by a reaction-diffusion medium, it
is necessary to convert the distribution of the concentrations of medium compo-
nents, corresponding to this solution, into an appropriate distribution of some
macroscopic physical quantities (“micro-macro” interface). The most convenient
way to do it is to record the spatial distribution of the optical characteristics of the
medium, such as coloring of the environment, spectral absorption, etc.
In the course of the reaction, when the medium goes from one state to another,
the catalyst of the reaction changes its electronic state. As a consequence, the
reagents change their color (from red to blue and vice versa). Thus, it is easy to
visualize the process and monitor the spatiotemporal evolution of the system. In this
case, the available optical tools such as a video camera facilitate entering the
registered distribution in computer memory for further processing.
5.1.4 Control and Energy Supply of the Processor
The same physical stimuli that are used to input information can also be control
actions. Thus control can be understood as the change of the medium's state
(relative concentrations of its components) by a given stimulus that leads to a
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