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1.
M. V. Zyubin I. A. Rudnev V. A. Kashurnikov 《Journal of Experimental and Theoretical Physics》2003,96(6):1065-1077
A system of Abrikosov vortices in a quasi-two-dimensional HTSC plate is considered for various periodic lattices of pinning centers. The magnetization and equilibrium configurations of the vortex density for various values of external magnetic field and temperature are calculated using the Monte Carlo method. It is found that the interaction of the vortex system with the periodic lattice of pinning centers leads to the formation of various ordered vortex states through which the vortex system passes upon an increase or a decrease in the magnetic field. It is shown that ordered vortex states, as well as magnetic field screening processes, are responsible for the emergence of clearly manifested peaks on the magnetization curves. Extended pinning centers and the effect of multiple trapping of vortices on the behavior of magnetization are considered. Melting and crystallization of the vortex system under the periodic pinning conditions are investigated. It is found that the vortex system can crystallize upon heating in the case of periodic pinning. 相似文献
2.
T. G. Dzherayan A. V. Rudnev V. P. Morgalyuk 《Russian Journal of Applied Chemistry》2006,79(10):1634-1638
Synthesis of polyhexamethyleneguanidine hydrochloride was studied by capillary electrophoresis. A procedure for determining the reaction components was developed. 相似文献
3.
V. S. Rudnev D. L. Boguta P. M. Nedozorov T. A. Kaidalova 《Russian Journal of Applied Chemistry》2006,79(2):256-263
Results obtained in studying the elemental and phase composition of anodic layers formed on titanium, aluminum, niobium, and zirconium under the action of electric discharges in aqueous electrolytes with hexametaphosphate complexes of Ni(II), Mg(II), and Mn(II) are presented. 相似文献
4.
Rudnev AV Aleksenko SS Semenova O Hartinger CG Timerbaev AR Keppler BK 《Journal of separation science》2005,28(2):121-127
A CE method has been developed to evidence and quantitatively characterize the interaction between platinum-based antitumor drugs and human serum proteins. This method is a variant of affinity CE modified regarding both experimental setup and data treatment so as to measure the peaks (or vacancies) that correspond to the bound drug when it slowly binds to the protein. Using the formalism of the Hummel-Dreyer method and cisplatin and oxaliplatin as test compounds, a protocol for determining albumin and transferrin binding constants and stoichiometries, including (and distinguished by) 48 hours of incubation of the reaction mixture, was elaborated. Relative affinities of drugs toward different proteins in aqueous solution at physiological pH, chloride concentration, and temperature were compared in terms of overall binding constants and numbers of drug molecules attached to the protein. The results indicate that both platinum drugs bind to albumin more strongly than to transferrin, supporting the concept that the albumin fraction is a major drug supply route for chemotherapeutical needs. From a comparison with the binding parameters measured previously for cisplatin by other methods, conclusions were drawn about the validity of CE as a simple and convenient method for assaying protein-drug reactions with slow kinetics. 相似文献
5.
A. Yu. Shaulov V. K. Skachkova O. B. Salamatina S. N. Rudnev A. N. Shchegolikhin S. M. Lomakin U. Eichhoff S. Steuernagel A. A. Samoilenko A. A. Berlin 《Polymer Science Series A》2006,48(3):228-233
The possibility of modifying boron polyoxide with an oligomeric amide upon thermal dehydration of orthoboric acid and oligomerization of caprolactam in a common melt is shown. The products obtained after thermal pretreatment of the initial blend containing 30 wt % caprolactam are investigated. It is shown that the main processes at T < 200°C are dehydration of orthoboric acid and hydrolysis of caprolactam with the formation of ε-aminocaproic acid. At temperatures of 225–260°C, the predominant process is the formation of boron polyoxide and a caprolactam-based oligomeric product. The data of 11B NMR spectroscopy show that the chemical transformations of caprolactam occur against the background of the N:B donor-acceptor interaction. The two-dimensional [11B-1H] heteronuclear correlation spectrum indicates that the systems obtained upon thermal treatment are solid solutions. 相似文献
6.
I. V. Chernykh I. V. Lukiyanchuk V. S. Rudnev P. M. Nedozorov L. M. Tyrina A. Yu. Ustinov 《Russian Journal of Applied Chemistry》2013,86(3):319-325
CuO+M x O y /TiO2+SiO2/Ti composites (M = Mn, Fe, Co, Ni) were produced by plasma-electrolytic oxidation and impregnation, followed by annealing. The elemental and phase composition of these composites were examined and their activity series in CO oxidation was determined. 相似文献
7.
A. V. Rudnev N. I. Ivanova N. G. Vanifatova T. G. Dzherajan 《Moscow University Chemistry Bulletin》2014,69(4):175-179
The effect of the time of ultrasonic treatment and concentration of aqueous Tween 80 on the stability of calcium hydroxyapatite suspensions was studied. The optimal conditions under which the system becomes stable were found using capillary-zone electrophoresis, dynamic light scattering, and scanning electron microscopy. The possibility of evaluating the system stability was shown based on studying the electrophoretic behavior of particles. 相似文献
8.
9.
An effect of annealing in air at temperatures 250, 350, 500, and 700°C on composition, surface structure, and catalytic activity in CO oxidation of a system MnO x ,SiO2/TiO2/Ti formed by combining methods of plasma electrolytic oxidation and impregnation was examined. 相似文献
10.
The results of magnetic flux penetration into high-temperature superconducting composites of the second generation have been analyzed and described. The distribution of magnetic flux was observed experimentally using the magnetooptical visualization technique at various temperatures of 4.2–80 K. The experimental data have been found to coincide with the results of analytical and semi-numeric calculations of magnetic field profiles carried out for regimes of full and partial field penetration into superconducting composites. The method of estimating the critical current density based on measurements of the topography of the transverse magnetic flux has been considered, and an approach to estimating the critical current density for strips from measurements of the tangential field component has been proposed. 相似文献