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51.
Cyclophosphorylation of β-cyclodextrin silyl derivatives with trivalent phosphorus acids dichlorides
M. K. Grachev A. A. Charaev G. I. Kurochkina N. O. Sobolev L. K. Vasyanina E. E. Nifant’ev 《Russian Journal of General Chemistry》2010,80(10):1933-1936
A study of cyclophosphorylation with trivalent phosphorus acids dichlorides showed that the reaction, in contrast to a similar
phosphorylation with phosphorous acid di- and triamides is less effective, and in the case of phenylphosphonous dichloride
is accompanied by a noticeable desilylation. 相似文献
52.
V. V. Sobolev A. I. Kalugin V. N. Kostenkov V. Val. Sobolev 《Russian Physics Journal》2008,51(6):557-561
The bands, state densities N(E), and permittivity are theoretically found for TlCl crystals. On the basis of the experimental
characteristic electron loss spectra, the spectra of the complete set of optical functions including permittivity and bulk
electron loss spectra are calculated and decomposed into components. The obtained data are compared with the well-known theoretical
results.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 8–11, June, 2008. 相似文献
53.
Sobolev VD Churaev NV Velarde MG Zorin ZM 《Journal of colloid and interface science》2000,222(1):51-54
The surface tension of water has been measured in quartz capillaries with radii from 200 down to 40 nm. It appears that the surface tension does not differ from the known (bulk) values in the temperature range from 8 to 70 degrees C, within 1% experimental error. The dynamic contact angle, theta(d), vanishes when the capillary surface is covered with a wetting film left behind the receding meniscus. In the case of a dry surface, theta(d) depends on the velocity of the meniscus motion. The results obtained do not agree with presently available theoretical predictions from hydrodynamic theories of dynamic contact angles. Rather the kinetics of water vapor adsorption ahead of the moving meniscus seems to be the major controlling agent of the dynamic contact angle. Copyright 2000 Academic Press. 相似文献
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P.P. Fedorov O.E. Izotova V.B. Alexandrov B.P. Sobolev 《Journal of solid state chemistry》1974,9(4):368-374
Crystallographic characteristics of six new phases of idealized composition Ca8R5F31 which are formed in the CaF2RF3 (R = Y, HoLu) systems are reported. All the phases have a similar structure derived from CaF2 with slight distortion and pseudocubic unit cell parameters aord = 13adis (where adis is the parameter of the fluorite subcell). The degree of ordering increases in the lanthanide series with decrease of ionic radius and, in every system given, with an increase in the RF3 content of the solid solution. Significant influence of temperature and time of annealing on the degree of ordering was not detected. 相似文献
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Brian N. Figgis Philip A. Reynolds Alexandre N. Sobolev 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(7):731-734
The crystal structures of the α‐alums rubidium chromium bis(sulfate) dodecahydrate, RbCr(SO4)2·12H2O, and caesium chromium bis[tetraoxoselenate(VI)] dodecahydrate, CsCr(SeO4)2·12H2O, have been determined by X‐ray diffraction at 293 and 12 K. The metal atoms lie on sites and the anions lie on threefold rotation axes. The accurate and extensive data sets lead to much more precise determinations than are available from earlier work, particularly at 12 K. The changes in the atomic displacement parameters between 293 and 12 K correspond to the respective predominances of intermolecular and intramolecular vibrational effects. 相似文献