Assisted Electromigration of Bipolar Ions through Ion-Selective Membranes in Glycine Solutions

At current densities above the limiting diffusion currents in electromembrane systems, bipolar ions of amino acids react with protons or hydroxyl ions that form during irreversible dissociation of water molecules at membrane–solution interfaces, convert into cations or anions, and then, after a gradient of electric potential is imposed on the system, migrate through cation-selective or anion-selective membranes (assisted electromigration). This phenomenon makes it possible to effectively separate solutions containing bipolar ions and nonelectrolyte molecules using electrodialysis with alternate cation-exchange and anion-exchange membranes.     

Analogs of carbohydrate-metabolish coenzymes. Communication 4. Synthesis of 6-azauridine diphosphate glucose

Summary The synthesis is described of a new UDPG analog, 6-azauridine diphosphate glucose.The authors are deeply grateful to the group of workers at the Institute of Organic Chemistry and Biochemistry of the Czechoslovakian Academy of Sciences, headed by Dr. Smrt, for placing a preparation of 6-azauridine at our disposal.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1236–1241, July, 1964     

Formation of a Ti-C bond in reactions between the triphenylmethyl radical and titanium salts

Conclusions The feasibility of obtaining organometallic titanium compounds based on the recombination of the triphenylmethyl radical with Ti²⁺ and Ti³⁺ compounds was demonstrated.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2561–2563, November, 1976.     

The effect of scale factor on mechanical properties of lead alloys

The effect of scale factor on mechanical and physical properties of metals and alloys is of both scientific and practical interest. Its study permits determination of the role in formation of physical properties of such factors as surface quality, character and distribution of internal and surface defects, types of processing, grain size, etc. As is well known, scale factor manifests itself to a greater degree, the stronger the material in question. Possibly because of this, data on the effect of scale factor on the properties of lead alloys with their relatively low mechanical strength are absent from the literature. However, such an omission is not justifiable, since lead, which is widely used in industry, is a scarce and expensive material, and proper determination of optimum dimensions for lead products is of major importance. The present study will clarify in greater detail the role of grain size and general level of mechanical properties on the relative effect of scale factor. The practical value of the study lies in the following. The alloys studied are used in manufacture of protective cable shields. The shield thickness can vary over wide limits, depending on the properties of the alloy, construction of the cable, and conditions of transportation and use. Therefore, by increasing the strength and other desirable properties of the alloy, significant reductions can be made in shield thickness, producing considerable economic savings. However, this cannot be done without a knowledge of the dependence of the alloy's mechanical properties on dimensions of the final product or specimen. Commencing from conditions of cable shield transportation and use, the effect of scale factor on alloy properties was studied for tensile loading, creep, and cyclical bending. The data gathered permit evaluating the validity of calculations for change in cable shield thickness for replacement of one alloy by another.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 103–109, July, 1977.     

Theoretical investigation of the atomic and electronic structure of Li x BC3 intercalated compounds

Li _x BC₃ intercalated compounds with various configurations are studied for their possible application as electrode materials for lithium current sources. For this purpose, the band structure and the density of states were calculated for each structure, and energy stability and possible deformations due to a change in the unit cell volume during intercalation are investigated.     

Calculating the energy of vacancies and adatoms in a hexagonal SiC monolayer

It is noted that the development of semiconductor SiC-electronics is prevented by a low quality of grown silicon carbide single crystals. It is found that structural defects of a substrate penetrating into an epitaxial layer upon subsequent homoepitaxial growth can considerably degrade a device??s characteristics. We investigate the effect of the deformation of a hexagonal SiC monolayer on vacancy stability and material properties, and study the processes of silicon and carbon adatom migration over a surface of SiC.