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401.
V. I. Marchenko 《JETP Letters》2007,86(11):730-731
It is shown that mechanical twinning in smectic crystals is possible. The structure of the boundary of twins for a small disorientation
of crystallites is determined. The periodic twin structure, which should appear at the tension of the smectic layer, is proposed.
Original Russian Text ? V.I. Marchenko, 2007, published in Pis’ma v Zhurnal éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007,
Vol. 86, No. 11, p. 841. 相似文献
402.
S. V. Bykova V. D. Golyshev M. A. Gonik V. B. Tsvetovsky T. Duffar M. P. Marchenko I. V. Frjazinov 《Crystallography Reports》2004,49(2):312-317
The possibility of growing macrohomogeneous Ga1 ? xInxSb crystals with x = 0.2 was studied using the axial heating process close to the melt/crystal interface. The grown ingots were analyzed by a JSM-5300 scanning electron microscope and the experimental results were compared with the results of numerical simulation. It was shown that, as a whole, the mathematical model adequately describes the processes of the steady-state heat and mass transfer. It was found that, at the crystallization of Ga1 ? xInxSb by the axial heating process under conditions of weak laminar flows, longitudinal homogeneity is observed when a dead zone is formed in the melt and that the crystallization regime is similar to diffusion. It was shown that the composition of the grown crystals strongly depends on the structure of a melt flow and its dynamics. 相似文献
403.
L. N. Ignat’eva N. N. Savchenko Yu. V. Marchenko G. A. Zverev V. M. Buznik 《Russian Journal of Inorganic Chemistry》2018,63(11):1389-1394
Glasses of the MnNbOF5–BaF2–InF3 system were prepared. The structure, thermal behavior, and crystallization of these glasses were studied by IR and Raman spectroscopy, differential scanning calorimetry (DSC), X-ray powder diffraction, and microscopy. The \(\rm{NbO}_2\rm{F}_4^{3-}\) and \(\rm{InF}_6^{3-}\) ions form a mixed glass network. Glass crystallization occurs in one or two steps depending on the component ratio. The major crystal phases are Ba3In2F12 and BaNbOF5. The obtainability of transparent crystal-glass samples in MnNbOF5–BaF2–InF3 glasses via heat treatment is shown. 相似文献
404.
Anatoliy P. Marchenko Heorgiy N. Koidan Andrey A. Kirilchuk Alexander B. Rozhenko Aleksandr A. Yurchenko Aleksandr N. Kostyuk 《Heteroatom Chemistry》2015,26(4):277-289
Synthesis and deprotonation of N‐phosphanylated[1,2,4]triazolo[4,3‐a]pyridinium triflates were investigated. Phosphanylation by t‐Bu2PCl proceeds at N1 of starting triazolo‐pyridines. According to density functional theory calculations, deprotonation of the formed salt gives abnormal carbenes, which decompose by opening of the triazole cycle. Treatment by chlorodiphenylphosphane leads to an equilibrium mixture of N1‐ and N2‐phosphanylated salts, which under addition of base yields normal carbene that rapidly rearranges to form C‐phosphanylated product. Mechanisms of the reactions are discussed. 相似文献
405.
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
406.
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
407.
A. P. Serebrov V. A. Mityukhlyaev A. A. Zakharov A. N. Erykalov M. S. Onegin A. K. Fomin V. A. Ilatovskiy S. P. Orlov K. A. Konoplev A. G. Krivshich V. M. Samsonov V. F. Ezhov V. V. Fedorov K. O. Keshishev S. T. Boldarev V. I. Marchenko 《Physics of the Solid State》2010,52(5):1034-1039
The WWR-M reactor of the Petersburg Nuclear Physics Institute provides a unique opportunity for creating conditions of low radiative heat release (~4 × 10?3 W/g) at a sufficiently high neutron flux (~3 × 1012 neutrons/(cm2 s)). This opportunity can be implemented in the reactor thermal column, which represents a 1-m-diameter channel adjacent to the reactor core. This diameter of the channel allows the arrangement of the core gamma shielding made of bismuth (15 cm thick), a graphite premoderator (300 dm3) at a temperature of 20 K, and a converter with superfluid helium (35 dm3) at a temperature of 1.2 K. Calculations show that the heat release in the source (20 W) can be removed by pumping helium vapor, and the density of ultracold neutrons in an experimental trap will be ~104 neutrons/cm3, which is higher than that of existing sources of ultracold neutrons by two to three orders of magnitude. 相似文献
408.
R. V. Smalii A. P. Marchenko Y. N. Koidan A. A. Chaikovskaya A. M. Pinchuk A. A. Tolmachev 《Heteroatom Chemistry》2008,19(7):667-670
Isothiocyanatophosphonium salts bearing an aroxy group at the phosphorus atom have been obtained for the first time. As found, these compounds undergo an intramolecular heterocyclization to give hitherto unknown benzoxazaphosphininethiones or cyanoiminophosphoranes, according to the nature of the substituents on the aryl ring. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:667–670, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/hc.20491 相似文献
409.
The Denaturant- and Mutation-Induced Disassembly of Pseudomonas aeruginosa Hexameric Hfq Y55W Mutant
Victor Marchenkov Natalia Lekontseva Natalia Marchenko Ivan Kashparov Victoriia Murina Alexey Nikulin Vladimir Filimonov Gennady Semisotnov 《Molecules (Basel, Switzerland)》2022,27(12)
Although oligomeric proteins are predominant in cells, their folding is poorly studied at present. This work is focused on the denaturant- and mutation-induced disassembly of the hexameric mutant Y55W of the Qβ host factor (Hfq) from mesophilic Pseudomonas aeruginosa (Pae). Using intrinsic tryptophan fluorescence, dynamic light scattering (DLS), and high-performance liquid chromatography (HPLC), we show that the dissociation of Hfq Y55W occurs either under the effect of GuHCl or during the pre-denaturing transition, when the protein concentration is decreased, with both events proceeding through the accumulation of stable intermediate states. With an extremely low pH of 1.4, a low ionic strength, and decreasing protein concentration, the accumulated trimers and dimers turn into monomers. Also, we report on the structural features of monomeric Hfq resulting from a triple mutation (D9A/V43R/Y55W) within the inter-subunit surface of the protein. This globular and rigidly packed monomer displays a high thermostability and an oligomer-like content of the secondary structure, although its urea resistance is much lower. 相似文献
410.
Ostrovskaya V. M. Prokopenko O. A. Marchenko D. Yu. Krasnaya L. V. 《Russian Journal of General Chemistry》2021,91(7):1310-1315
Russian Journal of General Chemistry - A number of polydentate diazoarylcelluloses have been proposed in the form of reagent indicator, in which the functional diazo group is connected to the rest... 相似文献