Saturation curve equations for normal and heavy water

Compact and precise equations are obtained for the saturation curves of normal and heavy water.Notation p saturated vapor pressure - p_c critical pressure - T absolute temperature - T_c critical temperature - =T/T_c dimensionless temperature - =1 – ; r heat of vaporization - c _p ⁰ isobaric heat capacity of vapor in ideal gas state - c_s liquid heat capacity along saturation curve - v specific volume of vapor - a _i coefficients of Eq. (1) Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 40, No. 5, pp. 894–897, May, 1981.     

Thermophysical properties of composite materials in the Si<Subscript>3</Subscript>N<Subscript>4</Subscript> - BN system

The results of a study of the thermophysical properties (thermal diffusivity, heat capacity, heat conductivity, and coefficient of linear thermal expansion) of Si₃N₄ - BN hot-pressed composite (with BN concentration varying from 10 to 60 wt.%) in the temperature range of 20 – 900°C are reported.__________Translated from Novye Ogneupory, No. 10, pp. 47 – 49, October, 2004.     

Synthesis and Physicochemical Study of Compounds in UO3-AkOk/(Ak = B, Si, Ge)-HO Systems

A synthetic analog of soddyite mineral, (UO₂)₂SiO₄·2H₂O, was prepared by hydrolyzing ammonium uranosilicate under hydrothermal conditions. The germanium-containing structural analog of soddyite, (UO₂)₂GeO₄·2H₂O, was synthesized by precipitation from solution. The compound UO₂(BO₂)₂ was prepared by reaction with molten boron oxide. The structures and properties of the compounds prepared were studied by X-ray diffraction analysis, IR spectroscopy, and thermography. The enthalpies of formation of the compounds were determined by adiabatic reaction calorimetry.     

Carbide and titanium carbonitrides preparation from intermetal alloy scrap

The possibility to prepare metal ceramics based on carbides and titanium carbonitrides from intermetal alloy scrap has been studied. The influence of sintering conditions on phase and structure formation processes in a metal ceramics material and on the composition and properties of the prepared material has been analyzed.     

BEHAVIOR OF DISCRETE AND CONTINUOUS Sic AND C FIBERS IN a SILICON NITRIDE MATRIX UNDER CONDITIONS OF HOT PRESSING

Aspects of the problem of creating ceramic-matrix composites (CMC) in Si₃N₄ – SiCf and Si₃N₄ – Cf systems with high strength and crack resistance under the conditions of hot pressing are considered. Results of an evaluation of physicomechanical properties and a detailed study of the microstructure of CMC by electron and optical microscopy and fractographic analysis are presented. A complex analysis of the microstructure has shown the general rules of its formation in CMC and the behavior of SiC and C fibers of various types under the conditions of the developed technology. The level of the properties of CMC in the studied systems seems to be improvable by the creation of an interphase layer that controls the cohesion between the fibers and the matrix and by optimization of its composition.     

Architecture of a software training complex for aluminum industry personnel

We show results of developing the architecture of a software training complex for industrial personnel in the aluminum industry. The of a software training complex includes components that let a user solve education and training problems and receive efficient TP control skills.