A critical review of experimental studies of the so-called 'slow light' Arising from the anomalously high steepness of the refractive index dispersion under conditions of electromagnetically induced transparency or coherent population oscillations is presented. It is shown that a considerable amount of experimental evidence for observation of the 'slow light' is not related to the low group velocity of light and can be easily interpreted in terms of a standard model of interaction of light with a saturable absorber.
On the basis of a mathematical model of a combined crystallization process and a chemical reaction, an engineering method for calculating the crystallization process was developed using the example of an aqueous solution of the target substance 4,4'-di-[4"-chlor-6"-(n-sulfoanilino)-symmetric triazine-2"-ylamino]-stilbene-2, 2'-disulfonic acid of tetrasodium salt (sodium salt of Belofor).
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