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101.
102.
Donetsk Technical Physics Institute, Academy of Sciences of the Ukrainian SSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 4, pp. 12–16, July–August, 1990. 相似文献
103.
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Conclusions By the reactions of uracil and 6-methyluracil with chlorohydrins 3-(hydroxyalkyl)- and 1,3-bishydroxyalkyl-uracils were prepared, and their structures were proved.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1327–1329, June, 1968.We thank V. D. Kochkina and S. A. Flegontov for determining the IR spectra. 相似文献
105.
A near-field effect has been discovered experimentally in thermal radio emission of an absorbing dielectric medium. It is related to a specific character of the distribution of a quasistationary field component near a radiating surface. The effect consists of the fact that the effective depth of the received emission formation appears to be less than the skin-layer depth and depends on the size of the receiver antenna and its height above the surface. It can be considered as a new source of information about depth temperature distribution. A theory has been developed that allows for determining the relative contribution of wave and quasistationary components to the Plank emission received near the surface. 相似文献
106.
We analyze theoretically the thermal radiation of an absorbing half-space, received by an antenna of an arbitrary size located at an arbitrary height above the half-space surface. It is shown that the measured power consists of quasi-stationary (near-field) and wave components. The relative contribution of each component depends on the antenna size and height. Conditions under which the near-field component is dominant are found. It is shown that the total power of the radiation received from a uniformly heated medium is entirely determined by the medium temperature and is independent of the antenna parameters. If the influence of the quasi-stationary field is strong, then the received radiation is formed in a layer whose effective depth is less than the skin-layer depth. This effect can be used for detection of the near-field component of thermal radiation. 相似文献
107.
I. P. Romanova A. T. Gubaidullin I. A. Litvinov S. G. Fattakhov V. S. Reznik O. G. Sinyashin 《Russian Chemical Bulletin》2000,49(7):1195-1201
X-ray diffraction study demonstrated that the molecular and crystal structures of the complexes of 1,3-diallyl-5-[3-(diphenylphosphino)propyl]-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (1) with PdCl2 are determined to a large degree by intra- and intermolecular short contacts between different-polarity groups of the complex
molecules. The strength and the existence of the complexes may be affected by the solvents from which the crystals are grown.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1199–1204, July, 2000. 相似文献
108.
Roman V. Shpanchenko Rodion V. Panin Catherine Bougerol Evgeny V. Antipov 《Journal of solid state chemistry》2005,178(12):3715-3721
Lead vanadium phosphate Pb3V(PO4)3 was synthesized by solid state reaction and characterized by X-ray single crystal and powder diffraction, electron microscopy, and magnetic susceptibility measurements. The crystal structure model of Pb3V(PO4)3 was refined using X-ray single crystal data (a=10.127(1)Å, S.G. Z=4). The compound has an eulytite-like structure and its average structure model may be presented as a three-dimensional network formed by strongly distorted mixed (Pb/VIII) metal-oxygen octahedra connected by edge sharing and forming corrugated chains. The octahedra are additionally linked by tetrahedral phosphate groups via corner sharing. Lead and vanadium atoms randomly occupy two close positions in the octahedra. The electron microscopy study revealed the presence of a rhombohedral superstructure with and indicating ordering in the structure. The same type of superstructure was found by us for two another lead-containing eulytite Pb3Fe(PO4)3 where Fe+3 has an ionic radius close to that of V+3. Magnetic susceptibility measurements revealed Curie-Weiss behavior for the Pb3V(PO4)3 compound. 相似文献
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