Porosity of detonation-deposited chromium carbide-base coatings

Conclusions The variation of the open porosity of a coating as a function of detonation-deposition process conditions matches that of the quality of the coating as assessed by other parameters. The open porosity of a coating is strongly affected by its surface roughness, and consequently estimates of _op may be high. The size of a specimen for open porosity testing should not be greater than 1.2 times the barrel bore. Under optimum conditions the visible porosity of coatings does not exceed 1%.Translated from Poroshkovaya Metallurgiya, No. 7(259), pp. 17–20, July, 1984.     

Photoelectrochemical Activity of Nanosized Titania,Doped with Bismuth and Lead,in Visible Light Region

Protection of Metals and Physical Chemistry of Surfaces - A method for the preparation of film coatings of titania doped with bismuth (Bi3+) and lead (Pb2+) ions, separately and simultaneously, has...     

Formation of liquid film downstream of an atomizer and its disintegration in gaseous medium

Results from experimental and calculation studies of liquid film downstream of a dual-orifice centrifugal atomizer are presented. It is revealed that film generated downstream of an atomizer with a specified geometry may exist in different forms, which depend only on the liquid flow rate.     

Characteristics of spontaneous revertants in haploid yeast

The appearance dynamics of spontaneous revertants in adenine- or leucine-auxotrophic haploid Saccharomyces cerevisiae strains has been studied using mathematical simulation methods. In the case of adenine auxotrophs an increase in the number of revertants with decreasing metabolite content is found to result mainly from increasing the rate of intragenic suppressor mutations. In the case of leucine auxotrophs revertants result from increasing the appearance of mutants formed at similar rates under different cultivation conditions. In the latter case the appearance of mutant colonies increases with decreasing size of colonies of the initial auxotrophic cells. The last can simulate so-called adaptive mutagenesis. The heterogeneity of revertants appearing in different time periods is described.     

Epoxyurethane coatings for protecting steel against corrosion in ammonia sulfate

Translated from Fiziko-Khimicheskaya Mekhanika Materialov, No. 1, pp. 98–100, January–February, 1989.     

Study of hydrodynamics and mass transfer in the flow of oppositely swirled jets about a stabilizer in an annular channel

Experimental and theoretical methods are used to study the distribution of the velocity components, turbulence intensity, and the concentration of a passive impurity. An analysis is made of the effect of the main geometric parameters on the intensity of transport processes.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 56, No. 1, pp. 12–18, January, 1988.