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61.
Konstantin L. Ivanov Anna A. Kravtsova Elena A. Kirillova Mikhail Ya. Melnikov Ekaterina M. Budynina 《Tetrahedron letters》2019,60(30):1952-1955
A convenient synthetic strategy for the diastereoselective assembly of spiro[azepane-4,3′-oxindoles] was developed via a Staudinger/Michael/aza-Wittig/reduction/N-deprotection reaction sequence starting from PMB-protected oxindole-substituted ethylazides. The key step of the method is a domino self-catalytic Michael/aza-Wittig reaction wherein the phosphazene moiety acts first as the catalyst and then as the reactant, resulting in the formation of a seven-membered N-heterocycle. 相似文献
62.
M. Yu. Melnikov A. A. Shashkin V. T. Dolgopolov S. V. Kravchenko S. -H. Huang C. W. Liu 《JETP Letters》2014,100(2):114-119
The effective mass m* of the electrons confined in high-mobility SiGe/Si/SiGe quantum wells has been measured by the analysis of the temperature dependence of the Shubnikov-de Haas oscillations. In the accessible range of electron densities, n s , the effective mass has been found to grow with decreasing n s , obeying the relation m*/m b = n s /(n s ? n c ), where m b is the electron band mass and n c ≈ 0.54 × 1011 cm?2. In samples with maximum mobilities ranging between 90 and 220 m2/(V s), the dependence of the effective mass on the electron density has been found to be identical suggesting that the effective mass is disorder-independent, at least in the most perfect samples. 相似文献
63.
64.
D. Melnikov D. Pushkin V. Shevtsova 《The European physical journal. Special topics》2011,192(1):29-39
The study addresses the phenomenon of accumulation of rigid tracer particles suspended in a time-dependent thermocapillary
flow in a liquid bridge. We report the results of the three-dimensional numerical modeling of recent experiments [1,2] in
a non-isothermal liquid column. Exact physical properties of both liquids and particles are used for the modeling. Two liquids
are investigated: sodium nitrate (NaNO3) and n-decane (C10H22). The particles are modeled as perfect spheres suspended in already well developed time-dependent thermocapillary flow. The
particle dynamics is described by the Maxey-Riley equation. The results of our simulations are in excellent agreement with
the experimental observations. For the first time we reproduced numerically formation of the particle accumulation structure
(PAS) both under gravity and under weightlessness conditions. Our analysis confirms the experimental observations that the
existence of PAS depends on the strength of the flow field, on the ratio between liquid and particle density, and on the particle
size. 相似文献
65.
Vokhmintcev A. V. Melnikov A. V. Mironov K. V. Burlutskiy V. V. 《Doklady Mathematics》2019,99(1):108-112
Doklady Mathematics - A closed-form solution is proposed for the problem of minimizing a functional consisting of two terms measuring mean-square distances for visually associated characteristic... 相似文献
66.
Zubkov M. V. Kalimullin I. Sh. Melnikov A. G. Frolov A. N. 《Siberian Mathematical Journal》2019,60(6):993-1002
Siberian Mathematical Journal - We estimate the complexity of constructing a punctual “online” copy of an algebraic structure. We establish a general upper bound as well as optimal... 相似文献
67.
Sarancha G. A. Eliseev L. G. Khabanov Ph. O. Kharchev N. K. Melnikov A. V. 《JETP Letters》2022,115(2):98-101
JETP Letters - The magnetic and electronic properties of quasi-one-dimensional iron chalcogenide compound KFeS2 have been calculated within two DFT + U approaches based on the simplified LSDA + U... 相似文献
68.
Dnestrovskij Yu. N. Danilov A. V. Dnestrovskij A. Yu. Lysenko S. E. Melnikov A. V. Nemets A. R. Nurgaliev M. R. Subbotin G. F. Soloviev N. A. Sychugov D. Yu. Cherkasov S. V. 《Physics of Atomic Nuclei》2023,85(1):S34-S49
Physics of Atomic Nuclei - The optical thickness of plasma is often insufficient to absorb completely electromagnetic waves when heated at the second harmonic of the electron-cyclotron frequency.... 相似文献
69.
70.
This work is devoted to the study of hollow-core photonic crystal fibers (HCPCF) dispersion properties. An effective scheme
of HCPCF eigenmodes analysis, lying in separate dispersion diagrams calculation for the cladding and for the HCPCF itself,
was proposed. General recommendations concerning selection of proper fiber parameters were given.
The text was submitted by the authors in English. 相似文献