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排序方式: 共有211条查询结果,搜索用时 31 毫秒
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Ya. S. Yakhyaev S. N. Khadzhiev T. M. Gairbekov S. E. Spiridonov 《Reaction Kinetics and Catalysis Letters》1986,30(2):263-268
The effect of hydrothermal treatment of decationized superhigh-silica zeolite on the mechanism of n-hexane conversion has been studied. It has been established that thermosteam modification sharply decreases the cracking activity and increases the selectivity to aromatization reactions. Zeolite acidity markedly decreases, but its crystal structure does not become amorphous.
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Pavlova N. V. Spiridonov F. F. Svetlov S. A. Pavlov I. N. Volkov Yu. P. 《Russian Journal of Applied Chemistry》2003,76(7):1094-1098
Centrifugal separation of low-concentration suspension in a biconical rotor of a centrifuge was modeled numerically. A system of equations describing the motion of solid particles in a fluid flow was constructed and solved. The effect of geometric parameters of the centrifuge rotor on the separation efficiency was demonstrated. 相似文献
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Treating the Debye intensity relationship as a linear Fredholm integral equation of the first kind, a method is developed for a non-parametric estimation of the probability distribution function P/r) for diatomic molecules from electron-diffraction data. Since the problem is an ill-posed one, Tikhonov's regularization procedure was used for the solution. The method was applied to iodine for which the non-parametric P/r) function is obtained. Based on this function the electron-diffraction parameters rg, ra and la are estimated by the linear least-squares method without a priori assumptions about the form of the vibrational potential. Approximating the potential by the Dunham expansion, the parameters re, ωe, K3 and K4 are also estimated. The results are compared with those obtained from conventional analytical representation of an intensity function. Comparison is also made with spectroscopic data for iodine. 相似文献
7.
A.A. Ischenko T.G. Strand A.V. Demidov V.P. Spiridonov 《Journal of Molecular Structure》1978,43(2):227-243
The pentachlorides of niobium and tantalum have trigonal bipyramidal structures (D3hsymmetry) with thermal average axial bonds, rα, longer than the equatorial ones by 0.097(9) and 0.142(5) Å, respectively. The equatorial bonds are r(Nb—Cl) = 2.241(4) and r(Ta—Cl) = 2.227(3) Å. Standard deviations are given. Calculated amplitudes of vibration for the e' type of bending frequencies assigned as v6 (equatorial in-plane bend) < v7 (axial—equatorial bend) agree significantly better with the experimental vibrational amplitudes than do amplitudes computed for the opposite assignment. Assuming an analytical quartic-harmonic potential for the pseudorotational motion of the molecules, barriers to pseudorotation of 1.5(0.7) and 1.2(0.6) kcal mol?1 are estimated from the electron diffraction data for NbCl5 and TaCl5, respectively. Effects from interatomic multiple scattering are included in the theoretical intensities, and are found to be of some importance to the results. 相似文献
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Abramova N Borisov Y Bratov A Gavrilenko P Domínguez C Spiridonov V Suglobova E 《Talanta》2000,52(3):533-538
Application of a potassium ion sensor based on an ion sensitive field effect transistor (ISFET) for ion control of a dialysis solution in an artificial kidney and in blood plasma of patients treated by hemodialysis is presented. Sensors and their long-term stability were characterised in constant contact with test solutions. Test results are compared to those obtained with conventional ion-selective electrodes and commercial blood ion analyser. Tested ISFET sensors showed high reliability in potassium ion measurements in the physiologically significant concentration range which, along with low cost of their production, makes them promising for cited application. 相似文献
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Vasily V. Spiridonov Mikhail I. Afanasov Lyudmila A. Makarova Andrey V. Sybachin Alexander A. Yaroslavov 《Mendeleev Communications》2021,31(3):412-414
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10.
Theoretical and Mathematical Physics - We study 6j-symbols or Racah coefficients for the tensor products of infinite-dimensional unitary principal series representations of the group SL(2,... 相似文献