Thermodynamic assessment of BaO–Ln2O3 (Ln = La,Pr, Eu,Gd, Er) systems

Heat capacities and enthalpies of formation of BaGd₂O₄ were determined by high-temperature differential scanning calorimetry and high-temperature oxide melt solution calorimetry, respectively. Thermodynamic stability of BaLn₂O₄ compounds increases with decreasing Ln³⁺ ionic radius. Previously reported data on BaNd₂O₄ and BaSm₂O₄ corroborate this trend. Missing data for compounds in BaO–Ln₂O₃ (Ln = La, Pr, Eu, Er) systems were estimated from established relations, thermodynamic assessment was performed, and binary phase diagrams were calculated.     

Choice of an optimal design and parameters for the manipulator of a mining machine

Polytechnical Institute, Karaganda. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 76–80, March–April, 1991.     

Use of different compositions in a technological scheme for decontamination of equipment from a gas-diffusion plant

Institute of Physical Chemistry, Russian Academy of Sciences. SKhK. Translated from Atomnaya énergiya, Vol. 79, No. 1, pp. 18–22, July, 1995.     

Numerical simulation of the combustion of pulverized coal in boiler combustors

A mathematical model and a method of calculation are proposed for the aerodynamics, combustion, and heat exchange in boiler combustors operating on pulverized coal. Numerical computations and comparisons with experimental data showed the method to be adequate for the processes considered.Scientific-Research Institute of Applied Mathematics and Mechanics, Tomsk, 634050. Translated from Fizika Goreniya i Vzyrva, Vol. 31, No. 2, pp. 23–31, March–April, 1995.     

Influence of the Pore Structure on the Electron Barrier Height of Metal-Ceramic Nanomaterials Based on Gold-Anodic Aluminum Oxide

Semiconductors - The influence of the of the pore structure on the electron barrier height of Au–Al2O3 structures is experimentally studied. The porous structures of anodic aluminum oxide of...     

Radiative <Emphasis Type="Italic">d–d</Emphasis> transitions at tungsten centers in II–VI semiconductors

The luminescence spectra of W impurity centers in II–VI semiconductors, specifically, ZnSe, CdS, and CdSe, are studied. It is found that, if the electron system of 5d (W) centers is considered instead of the electron system of 3d (Cr) centers, the spectral characteristics of the impurity radiation are substantially changed. The electron transitions are identified in accordance with Tanabe–Sugano diagrams of crystal field theory. With consideration for the specific features of the spectra, it is established that, in the crystals under study, radiative transitions at 5d W centers occur between levels with different spins in the region of a weak crystal field.     

Physical implementation of elements with fractal impedance: State of the art and prospects

In this review, we consider elements with a fractal impedance (henceforward, fractal elements, FEs). Advantages and drawbacks of various engineering and technological implementations of FEs are estimated. It is shown that promising FEs appropriate for production and solution of a wide range of scientific and engineering problems are structures on the basis of resistance-capacitance distributed parameter components (RC-DPCs) with the R–C–NR layer structure. It is established that RC-DPC FEs make it possible to implement fractal impedances with complex fractional-power frequency dependence. Examples of physical implementation of RC-DPC FEs are presented.     

Wear resistance of composite plasma coatings with graphite

The wear-resistant composite solid lubricant coatings formed by atmospherec plasma spraying method of cladding Ni[Cg] powder in relation to the extreme working conditions of friction units of aircraft engines and power plants have been investigated. Examples of studies of technological processes of the plasma spraying of protective coatings on elements of liquid-propellant rocket and gas turbine engines have been given, and the possibilities of sealing technologies to increase their service life have been shown. The evaluation of efficiency of coatings obtained by plasma spraying from mechanical mixtures of powders based on Ni[Cg] in relation to power plants of vehicles based on freepiston engines.     

B.V. Gnedenko: The father of the Russian school of reliability theory

Being asked to write a paper about Boris Vladimirovich Gnedenko, we decided to present the material in two parts: Ekaterina Gnedenko writes biographical notes from the angle of his research achievements and Igor Ushakov writes rather personal reminiscence. Gnedenko himself told about his life in the book of his memoirs [1].