Methods of manufacture of aluminum powders and their fields of application

Conclusions Aluminum powders, flakes, pastes, and granules are being successfully used in various branches of the national economy, including powder metallurgy. The present-day scale of industrial manufacture of aluminum and aluminum alloy powder products can satisfy virtually all the known demands from industry. There is a need to increase industrial production of aluminum alloy granules by the method of centrifugal casting of melts for the development of granule metallurgy, which enables successfully to process some materials, in particular low-grade and secondary aluminum.Translated from Poroshkovaya Metallurgiya, No. 12(264), pp. 32–37, December, 1984.     

The mechanism of the reaction forming tryptophanyl-tRNA, catalyzed by tryptophan:tRNA-ligase

The rates of tryptophanyl-tRNA formation catalyzed by beef pancreas tryptophanyl-tRNA synthetase were measured in a concentration range of each substrate (tryptophan, ATP and yeast tRNATrp) and also in the presence of various concentrations of substrate analogues (tryptamine and alpha,beta-methylene analogue of ATP) concentrations. The data obtained were compared with the kinetic equations which described various possible mechanisms of the reaction. The comparison of the mechanisms was based on the calculation of relative probabilities of each hypothesis the efficiency of which was demonstrated earlier. The calculations have shown that two mechanisms according to which the intermediate enzyme-aminoacyl-adenylate complex formation involves the enzyme-aminoacyl-tRNA complex are the most probable ones.     

Heat-exchange processes in the heat-supply zones of two-phase thermosiphons operating on freons 11, 113, and 142 and on water and ethanol

The main heat-exchange laws in the heat-supply zone of a two-phase thermosiphon are established. The heat-exchange intensity during boiling of the heat carrier in the heat-transfer element is determinedas a function of the geometrical and operating parameters.Fiftieth Anniversary of the Great October Socialist Revolution Kiev Polytechnic Institute. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 35, No. 2, pp. 211–217, August, 1978.