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21.
Kravets K. Yu. Grechnikov A. A. Simanovsky Ya. O. 《Journal of Analytical Chemistry》2021,76(14):1588-1595
Journal of Analytical Chemistry - The results of a study of the pathways of ion formation from organic compounds in Atmospheric Pressure Laser Plasma Ionization (APLPI) are presented. The... 相似文献
22.
L. I. Kravets V. A. Altynov M. Yu. Yablokov A. B. Gilman V. Satulu B. Mitu G. Dinescu 《High Energy Chemistry》2018,52(4):335-342
The morphology and chemical structure of nanosized polytetrafluoroethylene films deposited on the surface of track-etched poly(ethylene terephthalate) membranes by means of radiofrequency magnetron sputtering and electron-beam sputtering of the polymer in a vacuum have been studied using atomic force microscopy and X-ray photoelectron spectroscopy. It has been established that the morphology of films formed with the use of these coating techniques varies considerably. This is due to the size of the deposited polymer particles. The particles formed by the electron-beam sputtering of polytetrafluoroethylene are larger than those produced by magnetron sputtering of the polymer. It has been shown that the chemical composition of the films deposited by electron-beam sputtering in a vacuum is more in line with the composition and structure of the initial polymer than the films obtained by radiofrequency magnetron sputtering. 相似文献
23.
E. V. Frolova N. A. Kravets 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2016,10(2):312-316
The evolution of electron wave packets formed from surface states in topological insulators located in an external magnetic field is studied. The electron and spin densities of the wave packets under consideration are calculated analytically and are visualized. The influence of the main characteristics of the wave packets (the spin polarization) on the splitting and the change in their forms with time is considered. 相似文献
24.
The conditions of the formation of different magnetic structures with ferromagnetic (FM) and antiferromagnetic (AFM) ordering in granular materials containing a subsystem of ferromagnetic granules are considered within the phenomenological approach. It is supposed that the magnetostatic field and the exchange interaction between conduction electrons and magnetic ions are responsible for the formation of magnetic structure. 相似文献
25.
V. A. Kravets K. N. Orekhova M. A. Yagovkina E. V. Ivanova M. V. Zamoryanskaya 《Optics and Spectroscopy》2018,125(2):188-194
Spectra of Eu3+ in various dielectric matrices (Gd2O3:Eu3+, Y2O3:Eu3+, Eu2O3, and mSiO2/Gd2O3:Eu3+ mesoporous particles) are studied by local cathodoluminescence. The results allowed identification of the local environment of Er3+ ions in amorphous samples and detection of the monoclinic Eu2O3 phase impurity in samples with yttrium oxide. The cathodoluminescence spectra of chemically pure Y2O3, Eu2O3, and Gd2O3 are recorded. Conclusions about the structural features of the materials are made and confirmed by other methods (XRD and EPMA). 相似文献
26.
27.
T. N. Kravets 《Ukrainian Mathematical Journal》1995,47(4):640-644
We study the stability in probability of a solution of a stochastic differential inclusion in a finite-dimensional space with nonrandom coefficients and a maximally monotone operator in the drift coefficient.Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 47, No. 4, pp. 551–554, April, 1995. 相似文献
28.
S. D. Kravets Yu. S. Vollerner A. S. Shashkov M. B. Gorovits N. K. Abubakirov 《Chemistry of Natural Compounds》1988,23(6):700-706
Two new steroid glycosides of the spirostan series have been isolated from the fruit ofAllium cepa L. (family Liliaceae): alliospirosides C and D. On the basis of chemical transformations and spectral characteristics it has been established that the aglycon of both glycosides is a new steroid sapogenin — cepagenin — having the structure of (24S,25R)-spirost-5-ene-1,3,24-triol. Alliospirosides C and D are cepagenin 1-O-[O--L-rhamnopyranosyl-(12)-L-arabinopyranoside] and 1-O-[O--L-rhamnopyranosyl-(12)-O--D-galactopyranoside], respectively.Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 843–849, November–December, 1987. 相似文献
29.
Ivanova E. V. Masloboeva S. M. Kravets V. A. Orekhova K. N. Gusev G. A. Trofimov A. N. Shcherbina O. B. Yagovkina M. A. Averin A. A. Zamoryanskaya M. V. 《Optics and Spectroscopy》2019,127(6):1011-1017
Optics and Spectroscopy - The feasibility of synthesizing gadolinium tantalum niobates by the liquid-phase method was demonstrated. The methods of X-ray diffraction, electron probe microanalysis,... 相似文献
30.
L. V. Poperenko D. Yu. Manko K. L. Vinnichenko V. G. Kravets 《Journal of Applied Spectroscopy》2010,77(4):556-560
Data on spectral polarimetric measurements in the range of 0.05–0.60 eV are presented, along with calculations on the optical
characteristics of the surface layers of ribbons of the amorphous alloy Co59Fe5Ni10Si11B15 before and after thermal annealing in order to determine how the composition of the surface layer changes during this treatment.
It is shown that after annealing at a temperature of 425°C or above, the optical conductivity and the real and imaginary parts
of the dielectric constant revert to the values for typical metals in the IR. This treatment produces microregions with an
ordered structure in the surface layer. The experimental data show that for ribbons annealed at T = 475°C the spectral optical
characteristics do not obey the Drude relations and behave similarly to their amorphous analogs. 相似文献