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排序方式: 共有75条查询结果,搜索用时 31 毫秒
1.
Mayboroda I. O. Kolobkova E. M. Grishchenko Yu. V. Chernykh I. A. Zanaveskin M. L. Chumakov N. K. 《Crystallography Reports》2021,66(3):520-524
Crystallography Reports - The formation of β-Si3N4 for subsequent growth of AlGaN and GaN heterostructures of silicon wafers has been studied. It is established that the native oxide layer... 相似文献
2.
V. E. Diyuk A. A. Gorlova L. N. Grishchenko T. V. Chernyavskaya V. K. Yatsimirskii 《Theoretical and Experimental Chemistry》2011,47(4):264-269
The chlorination of activated charcoals KAU and SCN with CCl4 vapor in the temperature range 300–600 °C and also the thermal stability of the added chlorine has been studied. It is shown
that chlorination with CCl4 vapor led to the addition of up to 22 mass % (6.2 mmol/g) of chlorine to the surface layer of the carbon. The added chlorine
is desorbed from the surface with formation of HCl, while at temperatures above 500 °C desorption of chlorine goes practically
to completion. The effective rate constants and the energies of activation of the processes of chlorination and desorption
have been found. 相似文献
3.
A. E. Grishchenko A. I. Kononov L. B. Naumova B. A. Dribinskii N. A. Kas’yanenko 《Polymer Science Series A》2010,52(1):49-54
A high degree of planar orientational order of DNA molecules in thin films has been discovered by the oblique-polarized-beam
method. The coefficients of surface birefringence of films with different thicknesses are measured. The thickness of optically
anisotropic surface layers, which are characterized by macroscopic values higher than the diameter of DNA molecules by three
orders of magnitude in terms of thickness, is determined. A difference in the main polarizabilities of the monomer unit of
DNA, which is estimated for the films, is compared with the corresponding value for the solution measured by flow birefringence.
The effect of temperature on the coefficient of birefringence of the films is examined. A comparison of the data on the native
and denatured DNA shows that the degree of orientational order for the single-helix structure is smaller than that for the
double helix. 相似文献
4.
I. A. Prokhorov B. G. Zakharov V. E. Asadchikov A. V. Butashin B. S. Roshchin A. L. Tolstikhina M. L. Zanaveskin Yu. V. Grishchenko A. E. Muslimov I. V. Yakimchuk Yu. O. Volkov V. M. Kanevskii E. O. Tikhonov 《Crystallography Reports》2011,56(3):456-462
The possibility of characterizing a number of practically important parameters of sapphire substrates by X-ray methods is substantiated. These parameters include wafer bending, traces of an incompletely removed damaged layer that formed as a result of mechanical treatment (scratches and marks), surface roughness, damaged layer thickness, and the specific features of the substrate real structure. The features of the real structure of single-crystal sapphire substrates were investigated by nondestructive methods of double-crystal X-ray diffraction and plane-wave X-ray topography. The surface relief of the substrates was investigated by atomic force microscopy and X-ray scattering. The use of supplementing analytical methods yields the most complete information about the structural inhomogeneities and state of crystal surface, which is extremely important for optimizing the technology of substrate preparation for epitaxy. 相似文献
5.
L. N. Parshina A. P. Tantsyrev L. A. Grishchenko B. A. Trofimov 《Russian Journal of Organic Chemistry》2013,49(3):412-416
Zero-valent palladium nanoparticles stabilized by arabinogalactan polysaccharide matrix were successfully used for the first time as phosphine-free catalyst in the cross-coupling of terminal alkynes with aryl and hetaryl halides. 相似文献
6.
R. O. Grishchenko A. L. Emelina 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(1):1-5
A pure phase of monosodium aluminate hydrate Na2O · Al2O3 · 2.5H2O (MAH) is synthesized and characterized by means of XRD, IR, SEM, TGA, and DSC. The heat capacity of the compound is measured in the temperature range of ?100 to 100°C, and the thermal contributions to enthalpy and entropy are calculated. The standard entropy, enthalpy, and Gibbs energy of formation of MAH at 298 K are estimated. 相似文献
7.
8.
I. I. Lyashko A. E. Grishchenko N. Z. Prokhur O. P. Tsymbalyuk 《Journal of Mathematical Sciences》1994,69(6):1449-1454
The development of latent images on the free surface of thermoplastic thin films is modeled by the finite-difference method. The mixed boundary-value problem for the Navier—Stokes equations is solved by an algorithm which avoids the standard difficulties of integration of continuity equations. The efficiency of the implicit schemes is analyzed by comparing the numerical and analytical solutions in the isothermal case. The allowance for energy balance makes it possible to compute the hydrodynamic and thermophysical parameters in conditions close to reality.Academy of Sciences of the Ukrainian SSR. Kiev University. Translated from Vychislitel'naya i Prikladnaya Matematika, No. 68, pp. 100–107, 1989. 相似文献
9.
10.
L. A. Grishchenko L. N. Parshina M. Ya. Khil’ko V. I. Smirnov T. N. Borodina 《Russian Journal of Inorganic Chemistry》2018,63(7):881-886
The reaction between pyridine-2-carbaldehyde and zinc chloride in wet MeCN yielded a zinc chelate complex with hemiacetal formed in situ from the hydrated pyridine-2-carbaldehyde and the second molecule of pyridine-2-carbaldehyde. According to X-ray diffraction data, the pentacoordinated environment of the zinc ion is formed by two chlorine atoms and the N,N',O-tridentate ligand. In the crystal, molecules are combined into a 3D supramolecular framework due to the intermolecular hydrogen bonds O–H···Cl, C–H···Cl, and π–π stacking interactions between pyridine rings. 相似文献