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排序方式: 共有58条查询结果,搜索用时 15 毫秒
1.
G. R. Kosmambetova P. E. Strizhak É. M. Moroz T. E. Konstantinova A. V. Gural’skii V. P. Kol’ko V. I. Gritsenko I. A. Danilenko O. A. Gorban 《Theoretical and Experimental Chemistry》2007,43(2):102-107
The morphological and catalytic properties of samples of nanomeric zirconium dioxide, stabilized with yttrium oxide, manufactured
via the effect of a UHF field during the process of drying precipitated zirconium hydroxide and calcination at temperatures
from 300 to 1000 °C, were studied. It was shown that the highest activity in the oxidation of CO occurred with 40 nm particles
of zirconium dioxide prepared at 1000 °C.
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 43, No. 2, pp. 96–101, March–April, 2007. 相似文献
2.
Yu. B. Vysotsky V. S. Bryantsev O. A. Gorban 《Chemistry of Heterocyclic Compounds》2002,38(12):1451-1468
The effects of benzannellation, phenyl substitution at the nitrogen atom, protonation at the carbene carbon, ionization, and the state of the carbene center (2 or 2) on the electronic structure, diamagnetic susceptibility, induced -electron ring currents, the 1H, 13C, and 14N chemical shifts, and the energies of the lowest electronic transitions of imidazol-2-ylidenes and their oxo and thio analogs were examined in the bound version of -electron perturbation theory. The calculated and experimental data are compared. 相似文献
3.
O. V. Sobol’ A. A. Andreev V. F. Gorban’ V. A. Stolbovoy A. A. Melekhov A. A. Postelnyk 《Technical Physics》2016,61(7):1060-1063
The possibility of attaining an superhard state in multilayer vacuum-arc ZrN/CrN coatings with a layer thickness of about 20 nm has been established. It has been shown that the application of a constant negative potential for structural engineering during deposition leads to the formation of solid solutions due to mixing of interfaces. The hardness of these systems exceeds 30 GPa. The application of a pulsed high-voltage bias potential at which the ordering of atoms stimulated by elevated mobility is observed makes it possible to suppress the mixing of the interfaces and to attain elevated hardness (up to 42 GPa) for nanometer layer thicknesses. 相似文献
4.
A. K. Gorban 《Russian Chemical Bulletin》1964,13(9):1634-1634
Summary The infrared spectra of a number of alkyl vinyl acetals were taken.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1721–1722, September, 1964 相似文献
5.
S. Ansumali S. Arcidiacono S. S. Chikatamarla N. I. Prasianakis A. N. Gorban I. V. Karlin 《The European Physical Journal B - Condensed Matter and Complex Systems》2007,56(2):135-139
A general lattice Boltzmann method for simulation of
fluids with tailored transport coefficients is presented. It is
based on the recently introduced quasi-equilibrium kinetic models,
and a general lattice Boltzmann implementation is developed.
Lattice Boltzmann models for isothermal binary mixtures with a
given Schmidt number, and for a weakly compressible flow with a
given Prandtl number are derived and validated. 相似文献
6.
A. V. Pashchenko V. P. Pashchenko A. G. Sil’cheva V. K. Prokopenko A. A. Shemyakov Yu. F. Revenko V. P. Komarov S. V. Gorban’ 《Physics of the Solid State》2011,53(2):309-315
The structure and properties of lanthanum strontium manganite perovskites La0.6Sr0.2Mn1.2 − y
Cr
y
O3 ± δ (y = 0–0.3) sintered at 1430°C have been studied by X-ray, resistive, and magnetic (χac and 55Mn NMR) methods. The parameter of the rhombohedrally distorted (R
$
\bar 3
$
\bar 3
c) perovskite structure decreases with increasing y. The real perovskite structure contains point (anion and cation vacancies) and cluster-type nanostructure defects. The analysis
of asymmetrically broadened 55Mn NMR spectra has confirmed the high-frequency electron-hole exchange Mn3+ ↔ Mn4+ and local inhomogeneity of their surrounding by other ions and point and cluster-type defects. An increase in the Cr content
leads to an increase in the resistivity and the magnetoresistive effect and a decrease in the metal-semiconductor and ferromagnetic-paramagnetic
phase transition temperatures (T
ms
and T
c
) due to the distortion of the exchange interactions Mn3+ ↔ Mn4+ by chromium ions, vacancies, and clusters. Introduction of Cr decreases the ferromagnetic component and increases the activation
energy. The magnetoresistive effect near T
ms
and T
c
is caused by scattering of charge carriers from intercrystallite nanostructure inhomogeneities of the lattice, and the low-temperature
effect is associated with the tunneling on mesostructural intercrystallite boundaries. 相似文献
7.
A. V. Pashchenko V. P. Pashchenko V. K. Prokopenko A. G. Sil’cheva Yu. F. Revenko A. A. Shemyakov N. G. Kisel’ V. P. Komarov V. Ya. Sycheva S. V. Gorban’ V. G. Pogrebnyak 《Physics of the Solid State》2012,54(4):767-777
Ceramic samples of lanthanum strontium manganite perovskites La0.6Sr0.2Mn1.2 ? x Ni x O3 ± ?? (0 ?? x ?? 0.3) have been investigated using the X-ray diffraction, magnetic (??ac), 55Mn NMR, resistive, and magnetoresistive methods. The specific features of the influence of the composition on the structure and properties of nonstoichiometric manganite perovskites have been established. It has been found that the rhombohedrally (R $\bar 3$ c) distorted perovskite structure contains cation and anion vacancies, as well as nanostructured clusters with Mn2+ ions in the A-positions. The substitution of Ni3+ ions (r = 0.74 ?) for Mn3+ ions (r = 0.785 ?) leads to a decrease in the lattice parameter a, the ferromagnetic-paramagnetic phase transition temperature T C, and the metal-semiconductor phase transition temperature T ms due to the disturbance of the superexchange interactions between heterovalent manganese ions Mn3+ and Mn4+. The observed anomalous magnetic hysteresis at 77 K has been explained by the antiferromagnetic effect of the unidirectional exchange anisotropy of the ferromagnetic matrix structure on the magnetic moments of the superstoichiometric manganese Mn2+ ions located in nanostructured planar clusters. An analysis of the asymmetrically broadened 55Mn NMR spectra of the compounds has revealed a high-frequency electronic superexchange of the ions Mn3+ ? O2? ? Mn4+; a local heterogeneity of their surrounding by other ions, vacancies, and clusters; and a partial localization of Mn4+ ions. The local hyperfine interaction fields on 55Mn nuclei have been determined. The concentration dependences of the activation energy and charge hopping frequency have confirmed that the Ni ions decrease the electrical conductivity due to the weakening of the electronic superexchange Mn3+ ? O2? ? Mn4+. Two types of magnetoresistive effects have been found: one effect, which is observed near the phase transition temperatures T C and T ms, is caused by scattering at intracrystalline nanostructured heterogeneities, and the other effect, which is observed in the low-temperature range, is induced by tunneling through intercrystalline mesostructured boundaries. The phase diagram has demonstrated that there is a strong correlation between magnetic and electrical properties in rare-earth manganites. 相似文献
8.
A linear approximation for the Marcelin-de Donder kinetics (MC) near the point of detailed equilibrium (p.d.e./is studied. In particular it is shown that in the invariant plane the p.d.e. is stable knot.
- (MD) (...). , , ... — .相似文献
9.
10.