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141.
E. V. Aksenova B. B. Divinskii A. A. Karetnikov N. A. Karetnikov A. P. Kovshik E. V. Kryukov V. P. Romanov 《Journal of Experimental and Theoretical Physics》2014,118(2):323-332
We investigate the propagation of the extraordinary ray in a cell with a chiral liquid crystal at oblique incidence. For a 180° twist cell, we study the dependence of the minimum incidence angle at which the light does not yet pass through the cell on the applied voltage. The orientational structure of a liquid crystal in an external electric field has been calculated by directly minimizing the free energy. This has allowed the ray trajectories and the limiting refraction angles to be determined. The results of our calculations are consistent with the experiment. We show that allowance for the electric field nonuniformity in a chiral system is important for agreement between theory and experiment. 相似文献
142.
K. A. Aksenova 《Journal of Mathematical Sciences》2011,176(2):103-111
Following the approach suggested by I. Kaj and M. Taqqu, we consider a stochastic model of teletraffic based on Poisson random measure. We show that under appropriate assumptions, the finite-dimensional distributions for the scaled workload process converge to those of a stable Lévy process. Bibliography: 10 titles. 相似文献
143.
144.
A. K. Bakarov A. A. Bykov N. D. Aksenova D. V. Sheglov A. V. Latyshev A. I. Toropov 《JETP Letters》2003,77(12):662-665
Oscillations of the magnetoresistance commensurate with the spatial modulation period of the growth surfaces were observed in selectively doped GaAs quantum wells with AlAs/GaAs superlattice barriers grown by molecular beam epitaxy. The experimental data obtained are explained by the lateral potential modulation of the two-dimensional electron gas in narrow GaAs quantum wells with corrugated heteroboundaries and agree with the two-dimensional distribution of the local capacitance in such structures. 相似文献
145.
A. V. Aksenov I. V. Aksenova Yu. I. Smushkevich 《Chemistry of Heterocyclic Compounds》2001,37(8):976-981
2,3'-Biquinolyl dianion reacts with organolithium and organomagnesium compounds with the formation, after treatment of the reaction mixture with water, of 2'-alkyl(aryl)-1',2'-dihydro-2,3'-biquinolyls, and, after treatment of the reaction mixture with alkyl halides, of 1'-alkyl-2'-alkyl(aryl)-1',2'-dihydro-2,3'-biquinolyls. The reaction includes attack of the nucleophilic reagent with an electron transfer to a molecule of solvent. 相似文献
146.
Toikka A. M. Aksenova E. L. Kuznetsov Yu. P. 《Russian Journal of Applied Chemistry》2001,74(6):933-938
A comparative analysis is made of pervaporation and equilibrium open evaporation. The possibilities are considered of using data on the liquid-vapor equilibrium for analyzing the pervaporation process. Some specific features of the structure of diagrams for pervaporation and open evaporation of a ternary system are discussed for the example of the water-ethanol-isopropanol system. 相似文献
147.
T. V. Aksenova Sh. I. Elkalashy A. S. Urusova V. A. Cherepanov 《Russian Journal of Inorganic Chemistry》2017,62(8):1090-1098
Phase equilibria in the Nd–Co–Fe–O system were systematically studied at 1373 K in air. The homogeneity range and crystal structure of solid solution NdCo1–xFexO3 (0.0 ≤ x ≤ 1.0) have been studied by the X-ray powder diffraction method. The structural parameters of complex oxides have been refined by the full-profile Rietveld method. It was shown that all oxides reveal practically stoichiometric oxygen composition within the entire temperature range under investigation. The values of thermal expansion coefficients for the cobaltites NdCo1–xFexO3 (x = 0.3, 0.7) have been calculated within the wide temperature range in air. Chemical stability of NdCo1–xFexO3 (x = 0.3, 0.7) in respect to the solid electrolyte materials (Ce0.8Sm0.2O2–δ and La0.88Sr0.12Ga0.82Mg0.18O3-δ) was examined. Electrical conductivity of NdCo1–xFexO3 (x = 0.3, 0.7) was measured as a function of temperature within the range 300–1373 K in air. It was shown that substitution of cobalt for iron leads to the decrease of conductivity. The isothermal-isobaric cross-section of the phase diagram for the Nd–Co–Fe–O system at 1373 K in air has been presented. 相似文献
148.
I. A. Kotlova F. A. Kolokolov V. V. Dotsenko N. A. Aksenov I. V. Aksenova 《Russian Journal of General Chemistry》2019,89(12):2413-2419
New complex compounds LnL3·nH2O (n = 5–10) have been synthesized on the basis of Eu3+, Gd3+, and Tb3+ salts and quinoline-4-carboxylic acid derivatives obtained via the Pfitzinger reaction. Composition and structure of the ligands and the resulting complex compounds have been confirmed by NMR and IR spectroscopy, thermogravimetry, and complexometric titration. Europium complex with 1,2,3,4-tetrahydroacridine-9-carboxylic acid has exhibited efficient luminescence. 相似文献
149.
150.
The time correlation function of the multiply scattered light by a medium comprised of finite-size scatterers is studied theoretically and experimentally. A solution of the Bethe-Salpeter equation for the time correlation function is sought in the P 2-approximation in the form of a series of terms of the Legendre polynomials. With allowance for the boundedness of the medium, the problem is reduced to a generalized Milne equation, which is solved by the Wiener-Hopf method. The time dependence of the correlation function is studied experimentally in a concentrated latex suspension for particles of different sizes. The results of numerical calculations are in qualitative agreement with the measured dependence of the time correlation function on the scatterer size. 相似文献