Dynamic capacity of desiccants based on modified alumina at elevated pressures

Alumina desiccants obtained by extrusion molding of plastic pastes based on pseudoboehmite or bayerite-containing hydroxides including those modified by sodium and potassium ions were studied. The hydroxides were synthesized by hydration of the product of centrifugal thermal activation of gibbsite under mild conditions. The physicochemical and structural-mechanical properties of the desiccants (fresh and after nine adsorption–regeneration cycles) were studied. The dynamic capacity was determined at a pressure of 3MPa under conditions designed to model the industrial conditions. The sample obtained from bayeritecontaining hydroxide had a higher dynamic capacity than the sample obtained from pseudoboehmite-containing hydroxide at close texture and strength characteristics of adsorbents. Modification of the samples obtained from pseudoboehmite-containing hydroxide with potassium and sodium ions leads to decreased granule stability and increased volume, average pore size, and dynamic capacity. The potassium-modified sample of the desiccant had dynamic capacity as high as that of the sample obtained from bayerite-containing hydroxide at low load. After the cyclic tests, the phase composition, alkaline impurity contents, specific surface area, and crushing strength of the samples did not change within the error of determination. It was found that the prepared desiccants were highly stable in many adsorption–desorption cycles and the minimum dew point of –80°C could be reached during the drying.     

Corrections and accuracy in calculating rejection-probability estimators by simulation

Translated from Izmeritel'naya Tekhnika, No. 5, pp. 3–4, May, 1988.     

Analysis of calibration errors of a standard capacitance comparator

Translated from Izmeritel'naya Tekhnika, No. 4, pp. 49–51, April, 1990.     

Development of the technology for preparing and storing hydrogen with the use of nanostructured materials for an autonomous integrated wind power plant

This paper reports on the results of investigations into the design of an operating prototype of the power plant for the production and accumulation of hydrogen. The objective of this work is to develop technologies of intermediate storage of hydrogen with subsequent generation of an electric power due to the electrochemical processes occurring in fuel cells with an efficiency of no lower than 90%. The power plant is based on the wind power plant, which operates using an integrated software-hardware system for control over the power regime of the entire technological process. New membrane and catalytic materials prepared by the solgel method are used as functional components of fuel cells.     

Promising electromechanical energy converters based on new materials and coatings

The efficiency of new materials and the application of coatings for promising high-speed electromechanical energy converters has been estimated. A new basic model of miniturbogenerator intended for testing new materials and coatings has been developed. The experimental results obtained for pilot samples with different organic-silicate coatings show that the losses in the rotor decrease.     

Metrological analysis of an algorithm for measuring the dielectric constant and magnetic permeability of materials by simulation

Translated from Izmeritel'naya Tekhnika, No. 5, pp. 48–50, May, 1990.