Specific features of the liquid-phase epitaxial growth of SiC epilayers in vacuum

4H-SiC epilayers were grown by a liquid-phase epitaxy in vacuum. It was found that the seed layer with steps characteristic of liquid-phase epitaxy should be preliminary deposited on the substrate. It is demonstrated that growth in a vacuum leads to a decrease in the concentration of uncompensated carriers N _d–N _a to the level of 2×10¹⁶ cm^?3.     

Effects of inter-group correlations on sequential electron transitions through redox-mediated two-center electrochemical bridged contact

A consistent method for the calculation of the electric current through a redox-mediated electrochemical tunnel contact with two redox groups in the bridge molecule is presented for the sequential mechanism of electron transfer in the limit of infinitely large Coulomb repulsion between the electrons located in the same redox group. It is shown that the kinetic inter-group correlation exists which results in general in the deviation of exact solution from the approximate “quasi-chemical approach” even in the absence of inter-group Coulomb repulsion. The increase of the latter leads to the appearance of the electron correlation effects which result, in particular, in the second maximum (Coulomb blockade peak) in the current/overvoltage dependence.     

Fine structure and phase composition of NiCrAlY sputtered coatings

Structure of sputtered high-temperature coatings of composition (wt %) 20–22 Ni, 11–13 Cr, 0.3–0.5 Al, and the balance Y was studied by transmission electron microscopy. The information obtained may be useful in an analysis of the deposition process and operating damages of such protective coatings.     

Calculation of the probability of trouble-free operation of a main oil pipeline by an analytical-statistical method (a sequential model)

A serial model of a main oil pipeline system is investigated. Lifetime and repair time distribution functions of components are assumed to be of a general form. A new analytical-statistical method, enabling one to construct high-acuracy estimates and to evaluate the contribution of every component to system failure, is proposed. A numerical example is given. Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 132–145, July–August, 2000.     

Hot Particles of the Second Kind in Flood Lands of the Yenisei River

Specific modification of hot particles found in flood-land soils of the Yenisei River was studied. In contrast to the known hot particles (hot particles of the first kind), newly found hot particles are referred to as hot particles of the second kind. Abundance, radionuclide composition, and other characteristics of hot particles of the first and second kinds are compared.     

Conjugate heat transfer in an enclosure under the condition of internal mass transfer and in the presence of the local heat source

Conjugate convective–conductive heat transfer in a rectangular enclosure under the condition of mass transfer within cavity with local heat and contaminant sources is numerically investigated. Mathematical model, describing a two-dimensional and laminar natural convection in a cavity with heat-conducting walls, is formulated in terms of the dimensionless stream function, vorticity, temperature and solute concentration. The main attention is paid to the effects of Grashof number (Gr), Buoyancy ratio (Br) and transient factor on flow modes, heat and mass transfer.