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1.
2.
Voitsekhovskii A. V. Grigor'ev D. V. Korotaev A. G. Kokhanenko A. P. 《Russian Physics Journal》2004,47(7):764-772
The effects of wide- and narrow- variband layers on the charge-carrier concentration and mobility in the MBE-grown epitaxial CMT structures measured by the Hall-effect method are studied by numerical simulation. The dependence of the relative difference between the experimentally obtained effective values of electrophysical parameters and those of an epitaxial coating on the variband-layer characteristics is discussed. An analysis of this dependence shows that the manner in which the broad-band and narrow-band layers affect the resulting parameters is inequivalent. The calculations suggest that the effect of the wide-band layer on the experimental electrophysical parameters can be neglected. In the case of the narrow variband layer, however, the difference between the electophysical parameters strongly depends on the variband-layer parameters and the concentrations of ionized donor and acceptor centers. 相似文献
3.
V. Yu. Korotaev Yu. A. Skorik A. Yu. Barkov M. I. Kodess A. Ya. Zapevalov 《Russian Chemical Bulletin》2005,54(11):2545-2549
3,3,3-Trifluoro-N′-(3-trifluoromethylphenyl)-1,2-propanediamine (5) was synthesized by the reaction of 2-diazo-1,1,1-trifluoro-3-nitropropane or 3,3,3-trifluoro-1-nitropropene with 3-aminobenzotrifluoride
followed by the reduction of the nitro group. The Michael 1,4-addition of diamine 5 to acrylic acid occurs only at the N(1) atom and affords N-mono-or N,N-dicarboxyethyl derivatives 6 and 7, depending on the reactant ratio. Protolytic equilibria 5–7 in aqueous solutions were studied by pH-potentiometry and UV spectroscopy. Only the aliphatic amino group can be protonated
in an aqueous solution, while the aromatic amino group remains unprotonated even in 12 M HCl. The stability constants of transition metal (Cu2+, Ni2+, Zn2+) complexes with ligands 5–7 were determined by pH-potentiometric titration. The stability of the complexes and selectivity of the ligands toward Cu2+ ions increase with an increase in the number of N-carboxyethyl groups.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2465–2469, November, 2005. 相似文献
4.
Yu. I. Chumlyakov A. D. Korotaev L. S. Bushnev V. F. Esipenko Yu. G. Veselov 《Russian Physics Journal》1980,23(6):537-543
A study was made of the temperature dependences of the flow stress 0.1 (T) and of the critical shear stress cr(T) of Cu-15% A1-(1–2)% Co, Cu-8% A1-(2–2.8)% Co, and Cu-4% A1–2% Co alloys containing noncoherent intermetallic particles. In the case of single crystals at temperatures 77–673° K there was a good agreement between the theoretically calculated values of the Orowan hardening and those found experimentally, so that the dependence cr(T) was governed by the temperature dependence of the shear modulus G(T). For polycrystalline samples the usual dependence of the mechanical propertiesties on the grain size was not observed. At temperatures from 77 to 473–573°K the dependence 0.1 (T) was similar to the dependence G(T) and a good agreement was observed between the theoretically calculated dispersion hardening effects with those found experimentally. At temperatures T > 473–573°K the deformation was influenced greatly by grain-boundary glide, which enhanced the dependence 0.1 (T) compared with that expected theoretically.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 85–91, June, 1980. 相似文献
5.
An investigation was made of the kinetics of changes in the flow stress 0.1, modulation period , and electrical resistivity in the course of ageing of Cu-Ti, Cu-Ti-Al, Cu-Ti-Zn, and Cu-Ti-Ga alloys. There were no dispersion hardening effects during the early stages of the precipitation, corresponding to the = const condition. An increase in 0.1. was observed during the stage of coagulation of the secondary phases. The increase in the flow stress was described using a theory of hardening by coherent particles of the new phase but it did not agree with the theory of hardening of alloys exhibiting spinodal precipitation.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 81–87, May, 1980. 相似文献
6.
A. N. Tyumentsev A. D. Korotaev Yu. P. Kolobov K. A. Markov Yu. P. Pinzhin S. F. Tyumentseva 《Russian Physics Journal》1982,25(5):447-451
The paper gives the results of investigations on the rate of coalescence of zirconium oxides in Nb-Mo-ZrO2 alloy. On the basis of experimental results and theoretical estimates, it is shown that the stability of zirconium oxides in a niobium matrix increases substantially when the oxygen content in the solid solution rises. A high stability of zirconium oxides in niobium, which ensures a considerable (up to T 1800°C) increase in the recrystallization temperature and enhancement of the mechanical properties of the alloys at T 1100°C can be attained at an oxygen content C0 0.2–0.5 at.% in the solid solution.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 76–79, May, 1982. 相似文献
7.
A. A. Ostroushko A. P. Safronov M. O. Tonkushina V. Yu. Korotaev A. Yu. Barkov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(12):2179-2182
The interaction between solid Mo132 nanocluster polyoxometalate with the structure of a keplerate and solvents of different natures (e.g., water, alcohols, hexane, and tetrachloromethane) is studied thermochemically. NMR spectroscopy is used to analyze interactions in solid polyoxometalate-organic compound systems in a gaseous medium. Data are collected on sorption interactions between a Mo132 nanocluster and camphor. 相似文献
8.
9.
10.
The effect of hardening conditions on the decomposition of alloys Cu-Al-Co was investigated by studying the kinetics of the change of electrical resistance, measuring the paramagnetic susceptibility, and by transmission microscopy. The data obtained indicated a considerable effect of hardening vacancies on the process of nucleation of the stable phase (CoAl). It is shown that nucleation of phase CoAl occurs on vacancion clusters. 相似文献