Solvability in Lebesgue spaces of nonlinear boundary equations of one-sided contact problems of elasticity theory

We investigate the solvability of one-sided contact problems with nonlinear boundary conditions. The results generalize the author's previous results to the case of equations in Lebesgue spaces.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 66, pp. 77–83, 1988.     

Effect of a precursor on the phase composition and particle size of the active component of Ni-ZrO2 catalytic systems for the oxidation of methane into syngas

The effect the method of preparation has on the formation, phase composition, porous structure, and catalytic properties of the 10% Ni-ZrO₂ system during the partial oxidation of methane into syngas is studied. Stages of the formation of catalysts from precursors and the effect the method of preparation has on the phase composition, particle size, and catalytic properties of the active component during the partial oxidation of methane into syngas are investigated by means of synchronous TG-DTG/DSC and X-ray diffraction. The synthesis of a catalyst precursor via coprecipitation is shown to yield a monophase system with high nickel dispersion, catalytic activity, and stability.     

Trapping centers and recombination in pyrolytic boron nitride

The methods of fractional thermoluminescence and thermally stimulated currents are used to study the energy and kinetic parameters of trapping and recombination centers of pyrolytic boron nitride. Three types of monoenergetic traps with energies of 0.55, 0.85, and 1.05 eV are detected against the background of a quasicontinuous distribution of additional levels. A scheme of recombination processes is put together on the basis of measurements of the sign of the carriers, x-ray luminescence, and thermoluminescence spectra. The correlation of the activation energies, frequency factors, and the luminescence and conduction distributions confirmed that an electron-hole mechanism is responsible for the electrotransport with a predominant contribution from holes.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 72–76, November, 1989.     

Enrichment centers in sodium bromide crystals

The primary products of irradiation of alkali halide crystals are anion and cation Frenkel pairs [1–4]. Interaction of these products among themselves and with structural defects existing before irradiation leads to the appearance of various structural defects, the majority of which are optically active. The present study will treat enrichment centers which can be formed from the components of Frenkel cation pairs. Studies of this type are important in providing information on states in which radiation-created cation defects can exist stably in the lattice.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 119–121, August, 1979.     

Heterogeneous-Catalytic Dimerization of Methanol

Oxide systems supported by -Al₂O₃ and MgO were studied in oxidative dimerization of methanol. The highest selectivity is exhibited by tin oxide promoted with Na₂O and La₂O₃ supported by magnesium oxide. Reactions of partial oxidation and etherification of methanol and ethylene glycol proceed on this system to the same extent as dimerization of methanol to ethylene glycol.     

Production of a highly dispersed carbon material and hydrogen from natural gas in a microwave reactor with metallic catalysts

Effect of a microwave field on metallic catalysts was studied in the reaction of decomposition of methane into hydrogen and highly dispersed carbon. The dependence of the conversion of methane, yield of carbon, and its composition on the chemical nature of a catalysts and reaction conditions was examined.