Thermal regimes of anisotropic-thermoelement thermal converters

A computational procedure is developed for the thermal regime of anisotropic-thermoelement thermal converters of cavity and plane types used to investigate heat fluxes and energy parameters of radiation. Heat losses from different elements of the thermal-converter structure are analyzed and the parameters of a battery of anisotropic thermoelements are optimized, providing maximum sensitivity at minimum measurement errors. The results obtained were used in developing a fundamentally new cavity-type filter pyrheliometer and commercially produced automatic absolute radiometers. Translated from Inzhenerno-Fisicheskii Zhurnal, Vol. 73, No. 2, pp. 447–453, March–April, 2000.     

Modified track membranes with antibacterial properties

Microbiological contamination of polymeric membranes in the process of their exploitation is an essential problem of membrane technology. It results in the increase of manufacturing costs, destruction of membranes, operating life reduction and secondary contamination of water by the metabolism products of microorganisms. For the purpose of reduction of membrane biofouling and biodegradation investigation of adsorption of the guanidine containing oligomers on the surface of PET track membranes was conducted and their influence on the selectivity and antibacterial properties of the membranes was investigated. It was established that modified membranes have substantially higher resistance to biofouling.     

Features of compacting hydrogen-doped granules of a VT5-1kt titanium alloy

The effect of hydrogen on consolidation of granules of the VT5-1kt alloy, as well as the structure, mechanical characteristics, and fracture micromechanism of a compact produced by the hot-isostatic-pressing technique, is studied. It is established that hydrogen doping allows obtainment of a compact of the VT5-1kt alloy of 100% density with a high complex of properties in the course of a few minutes at such temperature-strength conditions in which the consolidation of granules is not realized. It is shown that the process of consolidation of hydrogenated granules proceeds more effectively in the (α + β) region.     

Effect of Preparation Conditions on the Phase Composition of ZrO2–Al2O3–CeO2 Powders

Data are presented on the phase composition of ZrO₂–Al₂O₃–CeO₂ powders containing 10, 30, and 70 mol %, prepared via coprecipitation and successive precipitation. The precipitation procedure is shown to have a strong effect on the phase composition of the heat-treated powders and the state (inter- or intracrystalline) of the T-ZrO₂ phase, thereby changing its stability. At an Al₂O₃ content of 30 mol %, the M-ZrO₂ content is independent of the precipitation procedure.