Some principles of the recrystallization of oxides of the M2O3 composition

Conclusions In the series of oxides under discussion, A1₂O₃, Sc₂O₃, and Y₂O₃, the greatest tendency for recrystallization is found in Al₂O₃. Marked structural changes occur at 1400°C. The Y₂O₃ and Sc₂O₃ oxides are stable up to a temperature of 1600°C.The method of preparing the ceramic has a significant effect on the absolute recrystallization rates of the material. The structure of the sintered materials after a 20–50 h dwell at 1400–1800°C is stabilized while there is a monotonic increase in the size of the grains for hot-pressed specimens after heat treatment for 50 h.The addition of small quantities of MgO to A1₂O₃ and ThO₂ and ZrO₂ plus W to Y₂O₃ is very effective in preventing active recrystallization. A prolonged thermal dwell in vacuo leads in the case of an Al₂O₃-based ceramic to the intense redistribution of impurities and additives.Translated from Ogneupory, No. 6, pp. 46–51, June, 1980.     

Influence of cation dyes on blood coagulation

Experiments on rabbits showed that intravenous injection of dyestuffs of the thionine series (toluidine blue, azur A, 1:9 dimethylene blue) was accompanied by hypofibrinogenemia, a decrease in the concentration of prothrombin complex factors, thrombocytopenia and the lowering of the blood platelets adhesion against the background of delayed blood thrombogenesis. The blood heparin tolerance and the amount of free heparin were sharply lowered. The authors consider that the hypocoagulative effect of cationic dyestuffs on the blood was caused by the thrombocytopenia and by the lowering of the platelet aggregation activity.     

Laser Raman and DTA/TGA study of H3+n PV n Mo12-n O40 heteropolyacids pure and supported on K3PMo12O40

According to TGA/DTA data thin layers of H_3+n PVnMo_12-n O₄₀ heteropolyacids impregnated on K₃PMo₁₂O₄₀ support display increased thermal stability. Raman spectroscopy proves that these deposited, catalytically significant, acid layers represent a new structural quality and tend to retain certain number of crystallization water molecules. It is argued that the acids become stabilized due to the epitaxial relationship with the support, and the isomorphous acid layers are tenatively described as hexahydrates of the respective acids.     

Nonsmooth analysis in measurement processing

It is shown that processing dynamic measurements is an inverse problem in relation to cause-effect consequences and belongs to the class of turning-point methods, while nonsmooth analysis provides the necessary conditions for a minimum in the error functional in the form of a combined maximum principle. Translated from Izmeritel’naya Tekhnika, No. 2, pp. 6–11, February, 2009.     

The combined-maximum principle in problems of estimating the motion parameters of a maneuvering aircraft

The synthesis of an optimum tracking filter for a maneuvering aircraft, a problem that is considered an inverse dynamic problem, is studied on the basis of the combined-maximum principle. The filter equations are obtained without the use of the method of invariant immersion. It is shown that the estimates of trajectory parameters that are obtained via application of the new tracking filter possess higher accuracy characteristics than the estimates of the extended Kalman filter and considerably decrease the amount of computations.     

System for the regulation and control of the parameters of electron beams in the electron-electron storage ring VÉP-1

A system for the control of electron-beam parameters in the V~P-1 electron-electron storage ring is briefly described; methods used for observing and regulating the beam parameters are considered.Translated from Atomnaya Énergiya, Vol. 20, No. 3, pp. 220–223, March, 1966