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1.
V. I. Khromov V. V. Kharlamov A. M. Chekmarev G. A. Andropova B. A. Mamet A. S. Plachinda 《Hyperfine Interactions》1991,67(1-4):565-567
The iron containing corrosion products from water heat-carrier and deposits of the second circuit of the nuclear power plant were investigated by means of absorption Mössbauer spectroscopy. The nonstoichiometric magnetite and paramagnetic (superparamagnetic) iron oxide particles were found to be the main corrosion products. The fraction of the magnetically ordered phase varied in the range 0–100% depending on the location in the second circuit. 相似文献
2.
S. F. Chekmarev R. Mitri V. Bonaci-Koutecký 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,24(1-3):45-48
The ab initio molecular
dynamics (AIMD) [1] is combined with the heuristic, successive
confinement method of surveying a potential energy surface (PES)
[2], thereby offering a framework for the simulation study of
kinetics and equilibrium properties of metallic clusters. This
approach is applied to the study of Au4,
a cluster possessing a simple but specific PES, which consists
of very shallow and deep basins and due to this presents a
challenge to the conventional AIMD methods. Among other things,
the probabilities of the transitions between isomers have been
found, and on this basis, both the time-dependent and
equilibrium populations of the isomers have been calculated for
the conditions typical of the NeNePo experiments [3] in the
femtosecond pump-probe spectroscopy. 相似文献
3.
Chekmarev DS Lazareva MI Zatonsky GV Maskaev AV Caple R Smit W 《The Journal of organic chemistry》2002,67(23):7957-7967
Data on the selectivity of the Lewis acids induced transformations of the title compounds are presented, and the routes leading to formation of products containing either cyclohexane or 1,3-diene units are described. 相似文献
4.
E. S. Stoyanov S. V. Chizhevskaya A. M. Chekmarev 《Journal of Structural Chemistry》1994,34(5):722-730
Using quantitative difference IR spectroscopy we have found that the tibutyl phosphate & acts of zirconium from 12–15 M HN03 contain ionic associates [(TBP)2H+]Zr(NO3)5
– (I) and [TBP· H30+ (H20)n]Zr(N03)5
– (II), where n = 1, 2, as well as the Zr(N03)4(TBP)2 complex at a lower concentration than (I) and (I.). The equilibrium I II is shifted toward II at higher CHNo
3
0 and lower cZr
0. The structure of associates I and II is discussed.Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, D. I. Mendeleev Moscow Chemical Technological Institute. Translated fromZhurnal Strukturnoi Khimii, Vol. 34, No. 5, pp. 80–89, September–October, 1993.Translated by L. Smolina 相似文献
5.
6.
Pd-catalyzed cross-coupling reactions of 3,6-dichloropyridazine (1) with benzyl, aryl, and alkyl organozinc compounds led to selective mono-substitution of one of the chlorine atoms. The subsequent cross-coupling of the resulting monochlorides with RZnCl afforded unsymmetrical 3,6-carbon-disubstituted pyridazines. 相似文献
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10.
Experimental research on highly underexpanded gas jets flowing from supersonic nozzles into an ambient medium has shown that for fairly large Mach and Reynolds numbers at the nozzle exit the jet consists of several cycles or barrels [1–3]. The authors have made a theoretical study of these jets, using the nonstationary analogy method (law of plane sections). An approximate model of the flow is constructed and an analytic solution is obtained for the location of the boundary of the multicycle jet. The corresponding equivalent nonstationary problem of the expansion of a cylindrical slug of gas is solved numerically. The results are found to be consistent with the experimental data and make it possible to explain a number of observations. It is shown, for example, that the experimentally observed decrease in the amplitude of the cycles (maximum radius of the barrels) as they progress downstream is due to the dissipation of energy in shock waves. It appears that the length of the cycles is more or less independent of the dissipation and almost constant. The effect of the removal (supply) of heat, for example, due to radiation, the relaxation of internal degrees of freedom, etc., on the geometry of the jet is examined. It is shown that the removal of heat leads to a decrease in the amplitude of the cycles and the supply of heat to an increase, but, like dissipation, neither affects the length of the cycles. The problem of a jet in a weakly inhomogeneous atmosphere is solved. It has shown that the jet geometry possesses an adiabatic invariant linking the length and amplitude of the cycles.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 6, pp. 27–35, November–December, 1984. 相似文献