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for 40-50 min), the remaining components of the reaction remained in solution,
and the reaction occurred in the boundary layer over the surface of the silica gel.
A medium in which the catalyst was immobilized in a layer of hydrogel silica
gel, 1.0-1.5 mm thick. The catalyst was injected into a layer of silica gel during
its formation, other components of the reaction diffused into the layer from
solution over silica gel, and the reaction took place in the bulk layer.
Reactors with an immobilized catalyst eliminate pattern distortion caused by
external physical influences (vibration, random shocks, etc.). They can accommo-
date a much larger (compared to the liquid-phase reactor) amount of the initial
reagent. Therefore, the running time of the closed reactor without changing the
nature of the regime through depletion of reaction components was 1-2 h.
The utilized light-sensitive media (catalyst Ru(bpy)
3
Cl
2
) functioned in excitable
and oscillatory modes.
The initial composition of the excitable medium is as follows: H
2
SO
4
—0.3 M,
KBrO
3
—0.3 M, malonic acid—0.2 M, KBr—0.05 M.
The initial composition of the vibration environment is as follows: H
2
SO
4
—0.6
to 0.8 M, KBrO
3
—0.4 M, malonic acid—0.2 M, KBr—0.075 M.
The device for studying image processing operations by Belousov-Zhabotinsky
media provides four basic modes of operation.
When reusing a reaction-diffusion medium it is necessary to remove the traces
of previous experiments before the start of each variant. To this end the medium
was illuminated by intense (white) light for 1.0-1.5 min (Fig.
5.6a
).
To enter the initial information the light image was projected onto the surface of
the medium. Utilization of a half-transmitting mirror in the optical circuit allowed
for observing and controlling the information input process by a video camera
(Fig.
5.6b
).
The evolution of the entered image was recorded by a video camera. Moreover,
since external light sources were excluded, an image projector was used for uniform
illumination. Spectral composition and intensity of illumination were set by the
Photoshop 7.0 software (Fig.
5.6c
).
The optical scheme utilized allows to efficiently control the process of evolution
of the entered image. When, during the evolution of the original image, another
image defining the configuration of the medium is projected on the surface of the
medium, individual sections of the medium can be easily excluded from the process
of evolution or the process can be slowed down (Fig.
5.6d
). Figure
4.9
demonstrates
a concentration pulse bending around an obstacle, annihilation of pulses, and the
passing of a pulse through holes (the transformation of a linear wave into a circular
one).
Along with the experimental study of image processing operations, software
capable of performing numerical simulation was developed and utilized. It was
designed as two independent blocks. One of them is intended to enter the initial data
and visualize the results of the calculations, the second one to actually perform
calculations. Such an arrangement simplifies the addition of data-processing
