排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
L.Yu. Shchurova 《Solid State Communications》1982,44(8):1261-1264
We propose the model of the multicomponent exciton gas in lightly doped semiconductors. The conditions of the equilibrium approximation are discussed. The complete system of equations for the determination of the gas composition is established. The contribution of the excited states of the particles and the influence of the different interparticle interactions is discussed. 相似文献
2.
We show that it is possible to produce terahertz wave generation in an open waveguide, which includes a multilayer dielectric plate. The plate consists of two dielectric layers with a corrugated interface. Electrons, drifting in the potential well, interact with the non-uniform electric field which is induced near the dielectric interface by the natural wave of the waveguide. The corrugated period and parameters of the electronic system are chosen in order to ensure the most effective interaction of electrons with a wave. Generation of electromagnetic waves is achieved by converting the electrons? energy into the electromagnetic wave energy. 相似文献
3.
A. I. Kalashnikov S. V. Sysolyatin G. V. Sakovich E. G. Sonina I. A. Shchurova 《Russian Chemical Bulletin》2013,62(1):163-170
A ten-step scheme for the preparation of an antiviral agent, ethyl (3R,4R,5S)-4-acetylamino-5-amino-3-(pent-3-yloxy)cyclohex-1-enecarboxylate phosphate, from (-)-shikimic acid was studied. The main parameters of the synthesis were determined and the optimal conditions for the preparation of the intermediate compounds were selected. The total yield of oseltamivir phosphate calculated based on (-)-shikimic acid was 27%. 相似文献
4.
Journal of Russian Laser Research - Based on a quantum-mechanical model with a non-Hermitian Hamiltonian, we theoretically describe the tunneling current in a heterostructure containing a quantum... 相似文献
5.
Artyom Paromov Irina Shchurova Alla Rogova Irina Bagryanskaya Dmitriy Polovyanenko 《Molecules (Basel, Switzerland)》2022,27(3)
Scholars from around the world have been attempting to simplify and cheapen the synthetic method for the promising high-energy compound CL-20 for decades. The lack of understanding of the formation mechanisms of hexaazaisowurtzitane derivatives―CL-20 precursors―is a barrier to solving the said problems. Here, we report the results from an in-depth study into the acid-catalyzed condensation between benzamide and glyoxal in a molar ratio of 2:1 in polar protic and aprotic solvents. Sixteen compounds were isolated and identified, of which eight were synthesized for the first time. A geminal diol, N,N’-(2,2-dihydroxyethane-1,1-diyl)dibenzamide, was synthesized. Two isomers of 1,2-bis(benzoylamino)-1,2-ethanediol were isolated and identified. N,N’-(1-oxoethane-1,2-diyl)dibenzamide and 2-oxo-2-[(phenylcarbonyl)amino]ethyl benzoate were produced that were likely formed due to the 1,2-hydride shift. N-polysubstituted 1,4-dioxane-2,3,5,6-tetramine was synthesized for the first time, whose structure may be of interest as a scaffold for new explosives. DMSO, THF and HCOOH were found to be able to engage in a reaction with benzamide, or condensation products thereof, and glyoxal under acid-catalyzed conditions. 相似文献
6.
L.Yu. Shchurova 《Solid State Communications》1980,33(7):721-723
The nonequilibrium model of the exciton gas in semiconductors has been proposed. The composition of the multicomponent exciton gas has been calculated for Ge. The calculations based on the nonequilibrium model agree with the experimental data. 相似文献
7.
L.Yu. Shchurova 《Annalen der Physik》2009,18(12):928-934
We investigate the equilibrium state of interacting electron system with Fermi statistics in modulation doped structure with a wide quantum well. The model is formulated for the carrier system with a sufficiently high density, such that the de Broglie wavelength of electrons is smaller than the width of the quantum well. Due to a significant interaction of electrons with electric field of the doped layer, a state with strongly‐inhomogeneous density of electrons is formed. Within the hydrodynamic approach, we set up formalism for calculating the electron density across the width of the potential well. We have obtained the exact solution of the equations, which is expressed in terms of hypergeometric functions. Based on the deduced formulas, we performed numerical computations for the profile of carriers' concentrations in a potential well in the modulation doped Si/SiGe/Si structures. 相似文献
8.
V. A. Kulbachinskii L. Yu. Shchurova 《Journal of Experimental and Theoretical Physics》2009,109(1):117-127
The results of investigation of the magnetic and transport properties of a GaAs/InGaAs/GaAs quantum well delta-doped with carbon and manganese from different sides and containing a ferromagnetic phase are analyzed. A thermodynamic model is formulated and the composition of a system consisting of neutral Mn atoms, Mn ions, and holes in the quantum well is calculated for determining the concentration of free charge carriers. The contributions to the resistance from different mechanisms of hole scattering are calculated, and good agreement with the experimental temperature dependences of the resistance is attained. The calculated and experimental values of the negative magnetoresistance associated with variation in the contribution of scattering from magnetic ions of the spin-polarized system of charge carriers are found to be in quantitative agreement. 相似文献
9.
S. B. Nosachev N. A. Shchurova A. G. Tyrkov 《Russian Journal of Organic Chemistry》2011,47(4):577-580
Reactions of 2-benzylidenemalononitrile and 2-nitro-3-phenylacrylonitrile with aryl azides in diethyl ether at room temperature
gave mixtures of regioisomeric 1(3)-aryl-5-phenyl-4,5-dihydro-1(3)H-1,2,3-triazole-4,4-dicarbonitriles and 1-aryl-5(4)-phenyl-1H-1,2,3-triazole-5(4)-carbonitriles, respectively. 2-Benzylidenemalononitrile reacted with the same arylazides on heating in
boiling chloroform to produce 1-aryl-2-phenylaziridine-2,2-dicarbonitriles. 相似文献
10.