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排序方式: 共有459条查询结果,搜索用时 9 毫秒
451.
G. V. Benemanskaya S. N. Timoshnev S. V. Ivanov G. E. Frank-Kamenetskaya D. E. Marchenko G. N. Iluridze 《Journal of Experimental and Theoretical Physics》2014,118(4):600-610
The electronic structure of the n-GaN(0001) and Al x Ga1 ? x N(0001) (x = 0.16, 0.42) surfaces and the Ba/n-GaN and Ba/AlGaN interfaces is subjected to in situ photoemission investigations in the submonolayer Ba coverage range. The photoemission spectra of the valence band and the spectra of the surface states and the core 3d level of Ga, the 2p level of Al, and the 4d and 5p levels of Ba are studied during synchrotron excitation in the photon energy range 50–400 eV. A spectrum of the surface states in Al x Ga1 ? x N (x = 0.16, 0.42) is found. The electronic structure of the surface and the near-surface region is found to undergo substantial changes during the formation of the Ba/n-GaN and Ba/AlGaN interfaces. The effect of narrowing the photoemission spectrum in the valence band region from 10 to 2 eV is detected, and surface eigenstates are suppressed. The Ba adsorption is found to induce the appearance of a new photoemission peak in the bandgap at the Fermi level in the Ba/n-GaN and Ba/n-Al0.16Ga0.84N interfaces. The nature of this peak is found to be related to the creation of an accumulation layer due to a change in the near-surface potential and enriching band bending. The energy parameters of the potential well of the accumulation layer are shown to be controlled by the Ba coverage. 相似文献
452.
I.G.?MarchenkoEmail author I.I.?Marchenko A.V.?Zhiglo 《The European Physical Journal B - Condensed Matter and Complex Systems》2014,87(1):10
We consider the motion of an underdamped Brownian particle in a tilted periodic potentialin a wide temperature range. Based on the previous data and the new simulation results weshow that the underdamped motion of particles in space-periodic potentials can beconsidered as overdamped motion in the velocity space in the effective double-wellpotential. Simple analytic expressions for the particle mobility and diffusion coefficientare derived with the use of the presented model. These accurately match numericalsimulation results. 相似文献
453.
R. G. Glushkov N. K. Davydova N. B. Marchenko 《Chemistry of Heterocyclic Compounds》1989,25(2):189-190
A four-step synthesis of 4-methyl-1H-imidazo[4,5-c]quinoline from 2-methyl-3-nitro-4-oxo-1,4-dihydroquinoline is developed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 231–232, February, 1989. 相似文献
454.
455.
The reaction of butyrolactone acetal with CH acids was used to synthesize 2-methylenetetrahydrofuran derivatives. The latter react with dimethylformimide acetal to give a dieneamine that is capable of undergoing cyclization to furo [3,2-c]pyrimidine derivatives. This two-ring system was also synthesized by the reaction of cyanacetamide with 3-dimethylaminomethylenebutyrolactone acetal. The indicated acetal can also react with amidine components to give furo [2,3-d]pyrimidine derivatives.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 68–71, January, 1982. 相似文献
456.
I. N. Blinova S. A. Egorova I. V. Marchenko L. I. Saulina N. O. Blinov A. S. Khokhlov 《Chemistry of Natural Compounds》1976,11(4):506-512
Summary 1. New iron-containing antibiotics, viridomycins A, B, and C, have been isolated from the actinomyceteActinomyces viridaris.2. Deferriviridomycin A — the precursor of viridomycin A — possesses the capacity for binding not only iron ions but also cobalt, nickel, and copper ions. The copper, nickel, and cobalt analogs of viridomycin A have been obtained.M. M. Shemyakin Institute of Bioorganic Chemistry, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 490–498, July–August, 1975. 相似文献
457.
I. I. Marchenko 《Ukrainian Mathematical Journal》1999,51(6):889-898
We obtain estimates for the sum of deviations and sum of defects to power 1/2 in terms of the Valiron defect of the derivative at zero. In particular, the Fuchs hypothesis (1958) is verified. 相似文献
458.
Sergey P. Ivonin Tetjana E. Terikovska Alexandra A. Chaikovskaya Anatoliy P. Marchenko Georgiy N. Koydan Alexander M. Pinchuk Andrew A. Tolmachev 《Heteroatom Chemistry》1999,10(3):213-221
The phosphorylation of N‐methylpyrrole with phosphorus (III) halides has been studied. Migration of the dibromophosphino group from the second to the third position of N‐methylpyrrole, leading to the 3‐dibromophosphine, has been found. Methods for the synthesis of 2,4‐bisphosphorylated pyrroles have been developed. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10:213–221, 1999 相似文献
459.