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81.
E. V. Velichko Z. A. Mikhailovskaya M. V. Morozova E. S. Buyanova Yu. V. Emel’yanova S. A. Petrova V. M. Zhukovskii 《Russian Journal of Electrochemistry》2011,47(5):563-568
The results of our studies of solid solutions of the general composition Bi4V2 − x
Fe
x/2Cr
x/2O11 − δ are presented. The crystal-chemical parameters of different polymorphic modifications of BIMEVOX were determined. The particle
size distribution was determined by laser diffraction and optical microscopy. The surface of sintered preforms was studied
by scanning electron microscopy. The conductivity of sintered poly-crystalline samples as a function of temperature and composition
was studied by impedance spectroscopy. The conductivity was depends on the procedure for the synthesis of solid solutions.
The most promising compositions were revealed. 相似文献
82.
We consider a difference scheme for the heat equation with nonlocal boundary conditions containing a complex parameter γ. We single out stability domains in the complex γ-plane and derive a criterion for stability with respect to the initial data in the form of a condition on γ and the grid increments. 相似文献
83.
Olga B. Morozova Robert Kaptein Renad Z. Sagdeev Alexandra V. Yurkovskaya 《Applied magnetic resonance》2013,44(1-2):233-245
Pulsed-field-gradient nuclear magnetic resonance (NMR) combined with time-resolved chemically induced dynamic nuclear polarization (TR-CIDNP) was applied to study the reduction of guanosyl radicals in reactions with the proteins hen egg white lysozyme (HEWL) and bovine α-lactalbumin (BLA) in their native state. Guanosyl radicals were generated photochemically in the reaction of guanosine-5′-monophosphate with photosensitizer, triplet-excited 2,2′-dipyridyl. In this reaction, at pH 5 guanosyl cation radical is formed, which deprotonates to yield the neutral guanosyl radical. To minimize the contribution of the cation radical, phosphate buffer was added, which accelerates the deprotonation of guanosyl cation radical. From model simulations of CIDNP kinetics the rate constants of the reduction were found to be (3.1 ± 0.5) × 107 M?1s?1 for HEWL and (1.6 ± 0.4) × 107 M?1s?1 for BLA. Also, experiments were carried out at the conditions for denatured HEWL, i.e., at 50 °C in the presence of 10 M urea-d4. The rate constant of the reduction of guanosyl radical in this case was (3.6 ± 0.5) × 108 M?1s?1. 相似文献
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