Nekrasov S.A.,South Russia State Technical University
Russian Journal of Electrochemistry | Year: 2013
The problems of distribution of ion concentrations, electric field, and Lorentz force in the flux of the solution of electrolyte under external magnetic field are solved. The existence of the diffuse ion layer in magnetic flow of the dilute electrolyte is established and its characteristics are studied. © Pleiades Publishing, Ltd., 2013.
Talanov V.M.,South Russia State Technical University |
Shirokov V.B.,Russian Academy of Sciences
Acta Crystallographica Section A: Foundations of Crystallography | Year: 2012
The possible distortions in the spinel structure resulting from rotation of the tetrahedra and octahedra have been investigated by a group-theoretical method. The possibility of the existence of 28 phases of rotation of the tetrahedra and five phases of rotation of the octahedra has been shown. In all these phases the polyhedra are equivalent, but their orientation can be different. Among the phases of the tetrahedra rotation there is one phase of pure rotation, i.e. not accompanied by additional (not rotation) distortions of the structure. Of the five phases of the rotation of the octahedra three phases can be obtained only by pure rotation of the octahedra. © 2012 International Union of Crystallography Printed in Singapore-all rights reserved.
Dovzhenko I.G.,South Russia State Technical University
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2014
The effect of metallurgical slag on the drying properties of ceramic bodies is investigated. It is shown experimentally that fine-grain slag makes the raw clay material less sensitive to drying. It is confirmed by means of electron microscopy, infrared spectroscopy and simultaneous thermal analysis that slag grains possess a highly developed porous surface. As a result some of the water introduced during the formation of ceramic bodies is adsorbed on the surface of the slag grains. It is shown that fine-grain metallurgical slag is an effective thinner in ceramic bodies. © 2014 Springer Science+Business Media New York.
Chernyshev V.M.,South Russia State Technical University |
Astakhov A.V.,South Russia State Technical University |
Starikova Z.A.,RAS Nesmeyanov Institute of Organoelement Compounds
Tetrahedron | Year: 2010
Reaction of 3,5-diamino-1-R-1,2,4-triazoles (R=Ph, Bn) with β-keto esters results in the reversible formation of N-(5-amino-1-R-1,2,4-triazol-3-yl)-substituted enaminoesters (8). Subsequent transformations depended on the reaction conditions. Compounds 8 undergo intermolecular reactions of condensation and amidation in the absence of solvent. However, in the presence of acetic acid they form 3-amino-5-oxo-2-R-2,5-dihydro-[1,2,4]triazolo[4,3-a]pyrimidin-4-ium-8-id es (10) followed by rearrangement to 3-amino-1-R-[1,2,4]triazolo[4,3-a]pyrimidin-5-ones (11). The transformation of 10 into 11 represents a new type of rearrangement in the azolopyrimidine series. Heating of enaminoesters 8 in ethanol with sodium ethoxide present, proved to be a suitable method for the preparation of the mesoionic compounds 10. © 2010 Elsevier Ltd. All rights reserved.
Yatsenko E.A.,South Russia State Technical University
Glass Physics and Chemistry | Year: 2011
The compositions of single-layer low-melting white enamels with a decreased (no higher than 720°C) firing temperature without toxic and expensive components have been developed. The mechanisms of formation of the developed single-layer low-melting enamels on a steel preliminarily treated by means of deposition of copper, nickel, and zinc films through electroplating, as well as by boronizing, have been investigated. © 2011 Pleiades Publishing, Ltd.