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61.
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
66.
A. F. Sobolev 《Acoustical Physics》2007,53(6):762-771
On the basis of the known approximate theories and the recent experimental data, a semiempirical theory of a resonance-type one-layer cellular sound-absorbing lining is developed. Approximate formulas are obtained for calculating the effective normal impedance with allowance for the geometric parameters of the sound-absorbing lining, the high sound-pressure levels, the presence of an entraining flow, and the nonlinear interaction of sound components of different frequencies within a given one-third-octave spectrum of noise. The results of numerical calculations by approximate formulas are compared with experiments and with the experimental and theoretical data reported by other authors. The proposed theory is found to agree well with experimental data. 相似文献
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Crystallography Reports - Nd1 – yEuyF3 – y crystals (y is the molar fraction of EuF2; 0 ≤ y ≤ 0.15) with a tysonite (LaF3) structure have... 相似文献
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S. S. Kutateladze V. E. Nakoryakov V. V. Sobolev I. R. Shreiber 《Journal of Applied Mechanics and Technical Physics》1974,15(5):638-642
Results are presented of a numerical solution of the Korteweg-de Vries-Burgers equation that describes the propagation and establishment process for a stationary structure to a shock wave in a gas-liquid medium. Data are obtained on the time for the establishment of a stationary structure of a shock wave, propagation velocity, and amplitude oscillations in the front of the shock wave. Experiments are discussed on the basis of the results obtained for the study of shock waves in a liquid containing gas bubbles. 相似文献