Modification of the adsorption properties of the dispersed phase of magnetorheological liquids

A rather simple method for modifying the surface of powder carbonyl ion — the most widespread material of the active dispersed phase of magnetorheological liquids — is developed. It is shown that the specimens of liquids prepared based on modified carbonyl iron have an improved sedimentation stability, a viscosity severalfold lower than the initial one, and hence an expanded control range of rheological parameters when the magnetorheological effect is the same as in reference specimens. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 73, No. 3, pp. 476–481, May–June, 2000.     

Waveguide-dielectric resonator method for accurate measurement of parameters of materials at high frequencies

The theory is given, with an analysis and various examples, of the practical implementation of a method for measuring the relative permittivity ɛ^*=ɛ′−iɛ″ of materials in the 0.5–26-GHz frequency range. The results and experimental errors are given of measurements of ε′ in the range 2–200 and of tanδ in the range from 5·10⁻⁵ to 2·10⁻². Translated from Izmeritel'naya Tekhnika, No. 6, pp. 62–66, June, 1999.     

Obtaining of Fuels Based on Products of Organic-Waste Steam Thermolysis

A technological line for thermolysis of technical rubber waste and biomass in the medium of superheated steam is considered. The characteristics of fuels based on liquid- and solid-waste thermolysis products are given, and the energy efficiency of obtaining composite fuels has been estimated. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 4, pp. 58–62, July–August, 2005.     

Changes in the properties of aluminosilicate refractories under prolonged reducing conditions

Conclusions Studies of corundum and aluminosilicate refractories of dense and granular structures in an atmosphere of hydrogen and dissociated ammonia at 1200, 1500, and 1700°C in periods of 175 and 50 h showed that the resistance of the products increases with an increase in the alumina concentration and density. The maximum resistance is exhibited by corundum products. In the aluminosilicate refractories there is some additional sintering of the material with the separation of mullite and glass. Simultaneously on the surface of the specimens we detected deeper mineralogical changes, accompanied by the decomposition of the mullite, with the formation of corundum, silicon monoxide, and glass.The changes in the phase composition are accompanied by a change in the structure, and an increase in the creep. Considering that a reduction in the temperature of 100°C causes a reduction in the creep by approximately a half [26], it can be recommended that corundum refractories should be used (under a load of 2 kg/cm²) in a reducing atmosphere at temperatures of up to 1550–1600°C, sillimanite up to 1450–1500°C, kaolin and chamotte (high-grog) up to 1300°C, with a reduction in the load and an increase in the density, the temperature of application for the products examined, especially corundum, can be increased.Translated from Ogneupory, No.5, pp.26–32, May, 1972.     

Choice of procedures for making measurements of the electromagnetic properties of materials

We consider the problems of choosing procedures for making measurements of the electromagnetic properties of materials at radio and microwave frequencies and also the metrological assurance of measurements of permittivity and permeability and of the loss tangent. Translated from Izmeritel'naya Tekhnika, No. 10, pp. 47–49, October, 1998.     

Measurement of electromagnetic parameters of materials at radio and microwave frequencies

Translated from Izmeritel'naya Tekhnika, No. 9, p. 11, September, 1994.     

State primary standard of the unit of relative permittivity and unit of relative permeability in the frequency range 1 MHz – 18 GHz

The composition and generalized block diagram of the State Primary Standard of the unit of relative permittivity and unit of relative permeability in the frequency range 1 MHz – 18 GHz and methods of reproduction and transfer of the unit are considered. Measurement equations for all the standard devices and a brief analysis of the errors that arise in reproduction of the unit are presented.