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排序方式: 共有251条查询结果,搜索用时 93 毫秒
1.
Musalov M. V. Yakimov V. A. Potapov V. A. Andreev M. V. Amosova S. V. 《Russian Journal of Organic Chemistry》2019,55(11):1809-1811
Russian Journal of Organic Chemistry - The reaction of selenium dichloride with methyl and ethyl propiolates leads to formation of anti-Markovnikov adducts. The regio- and stereoselective synthesis... 相似文献
2.
Crystallography Reports - The studies of wide-gap semiconductor materials using electron-beam induced current (EBIC) method are reviewed. The main methods for measuring the diffusion length of... 相似文献
3.
The hole thermal-emission rates and the cross sections for hole capture to the bound states in Ge quantum dots in Si are determined by admittance spectroscopy. The capture cross sections and the activation energies for emission rate are found to be related to each other by the Meyer-Neldel rule with a characteristic energy of 27±3 meV, which does not depend on the quantum-dot size. It is established that the capture cross section changes with temperature following the activation law. The experimental data are evidence of a unified multiphonon mechanism for the activation processes of hole transitions from the Ge quantum dots to the Si valence band and hole capture back into the quantum dots. 相似文献
4.
MM. J. Duflos D. Letouz G. Queguiner P. Pastour 《Journal of heterocyclic chemistry》1973,10(6):1083-1084
This communication describes the synthesis of l-methyl-2,3-diformylpyrrole. This new compound is used to prepare a new heterocycle, l-methylcyclohepta[b]pyrrol-6-one and thus allows a new synthesis of l-methylpyrrolo[2,3-d]pyridazine. 相似文献
5.
Sergei D. Kirik Julia N. Zaitseva Igor S. Yakimov Nikolay N. Golovnev 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(11):i159-i160
Lithium sodium aluminium fluoride was obtained as a white powder by melting a stoichiometric mixture of AlF3, NaF and LiF at 1223 K, and then cooling to 923 K and sintering at this temperature for 4 h. The ab initio crystal structure determination was carried out using X‐ray powder diffraction techniques. The monoclinic structure of LiNa2AlF6 can be related to cubic elpasolite. The Li and Al atoms lie on inversion centres. The main octahedral AlF6 structural elements are not deformed, but are rotated slightly with respect to the unit‐cell axes. The Li atoms have octahedral coordinations, whereas the Na atoms have cubo‐octahedral coordinations. The Na coordination polyhedron is distorted in comparison with that of elpasolite. 相似文献
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8.
A. Yu. Yakimov 《Fluid Dynamics》2012,47(6):789-792
Steady-state free plane surface waves are investigated in the nonlinear formulation by means of the narrow streak method. The second-order differential equation derived can readily be integrated numerically. The first approximation of the equation is integrated. The next approximation leads to a nonlinear first-order differential equation which is traditional to the problem considered and whose coefficients have a simple physical meaning. 相似文献
9.
Spectra of the photocurrent of holes in δ-doped Si layers with Ge quantum dots in weak external electric fields have been studied. It has been established that the photocurrent of the holes in the photovoltaic mode changes its sign with the increase in the impurity concentration in the δ layers. It has been found that there is a voltage range in the vicinity of the zero bias in which the direction of the photocurrent is determined by the wavelength of the exciting radiation. 相似文献
10.
V. A. Donchenko A. I. Yakimov A. A. Zemlyanov V. V. Kirienko 《Russian Physics Journal》2010,53(5):504-507
Results of investigations into the time characteristics of photosensitive layers based on Ge/Si nanoheterostructures excited
by femtosecond laser pulses with a wavelength of 1.55 μm are given. It is demonstrated that the leading front duration of
the photoresponse pulse for the examined specimens excited by laser pulses of 120 fs duration does not exceed 30–40 пs. 相似文献