Kinetic Regularities of the Heat Release for the Interaction of Some Organic Compounds with Ammonium Nitrate

Ammonium nitrate (AN) is used as an oxidant in a series of systems with a wide spectrum of applications, from explosive compositions up to smokeless stoichiometric self‐burning compositions with low combustion temperature. The knowledge of the thermal stability of such compositions is of great importance in using them in practice. In this work the research of kinetics of heat release in the interaction of AN with different organic compounds has been performed using the automatic differential calorimeter.     

Dry slipping steel–steel contact at high current density

The behavior of steel 3 in dry slipping under the action of high-density electric current is studied. In these conditions, the surface layer undergoes plastic deformation; its temperature rises; and new phases and structural defects are formed. That gives rise to a layer of secondary structures. The basic factor disintegrating the surface layer is the contact current density. The mean contact temperature and layer thickness of the secondary structures increase with increase in current density. The variation in wear rate and electrical conductivity with change in contact temperature is studied. The wear rate depends linearly on the contact temperature in normal wear. Catastrophic wear appears as sharp increase in the wear rate and simultaneous decrease in the contact electrical conductivity at 500—600°C. The thickness of the layer of secondary structures is 50 μm in these frictional conditions.     

Calculation of electric arc interaction with a turbulent gas flow

The characteristics of an electric arc in a turbulent gas flow are studied. Relationships for calculating turbulent transport are presented.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 54, No. 4, pp. 550–557, April, 1988.     

Feasibility of analysis of macroevolutionary rearrangements of mammalian chromosomes]

In the Institute of Cytology and Genetics, Siberian Division, Russian Academy of Sciences, detailed studies on chromosome sets of humans and domestic animals were initiated and supported by D.I. Belyaev and started by S.I. Radzhabli. They believed that analysis of differentially stained chromosomes and mapping of the genomes of main commercial species provide for a better understanding of the processes that occurred during their evolution and domestication. Several new approaches to studying macroevolutionary karyotypic rearrangements associated with divergence of remote taxa, such as primates and paridigitate ungulates, are discussed.     

Theory of a coarse-dispersed fluidized bed

A monodispersed system of large spheres in a gas, where momentum and energy exchange between the particles results mainly from their direct collisions, is studied. Mass and momentum conservation equations for both phases and a transfer equation for pulsatory energy of the particles are given, and all rheological relations, closing these equations, are derived.Urals State University, Ekaterinburg, Russia. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 63, No. 4, pp. 414–424, October, 1992.