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1,643 results on '"Shvets, V. A."'

14. High Temperature Equation of State of Metallic Hydrogen

Author

Shvets, V. T.

Subjects
Physics - Chemical Physics, Condensed Matter - Materials Science
Abstract

The equation of state of liquid metallic hydrogen is solved numerically. Investigations are carried out at temperatures, which correspond both to the experimental conditions under which metallic hydrogen is produced on earth and the conditions in the cores of giant planets of the solar system such as Jupiter and Saturn. It is assumed that hydrogen is in an atomic state and all its electrons are collectivized. Perturbation theory in the electron and proton interaction is applied to determine the thermodynamic potentials of metallic hydrogen. The electron subsystem is considered in the randomphase approximation with regard to the exchange interaction and the correlation of electrons in the local field approximation. The interproton interaction is taken into account in the hard spheres approximation. The thermodynamic characteristics of metallic hydrogen are calculated with regard to the zero-, second-, and thirdorder perturbation theory terms. The third-order term proves to be rather essential at moderately high temperatures and densities, although it is much smaller than the second-order term. The thermodynamic potentials of metallic hydrogen are monotonically increasing functions of density and temperature. The values of pressure for the temperatures and pressures that are characteristic of the conditions under which metallic hydrogen is produced on earth coincide with the corresponding values reported by the discoverers of metallic hydrogen to a high degree of accuracy. The temperature and density ranges are found in which there exists a liquid phase of metallic hydrogen.

Published
2016

25. On Decay of Correlations for Exclusion Processes with Asymmetric Boundary Conditions

Author

Malyshev, V. A. and Shvets, V. A.

Subjects
Mathematics - Probability, Mathematical Physics, 82C41
Abstract

We consider a symmetric exclusion process on a discrete interval of $S$ points with various boundary conditions at the endpoints. We study the asymptotic decay of correlations as $S\to\infty$. The main result is asymptotic independence of a stationary distribution whem the points are far away from each other. We develop a new recurrent probabilistic approach which is an alternative to Derrida's algebraic technique.

Published
2011

35. Linac Lue200. First Testing Results

Author

Dolya, S. N., Furman, W. I., Kobets, V. V., Laziev, E. M., Metelkin, Yu. A., Shvets, V. A., and Soumbaev, A. P.

Subjects
Physics - Accelerator Physics
Abstract

"LUE200" - 200 MeV electron linac is being created at JINR as a driver of the pulsed neutron source "IREN" [1]. The special full-scale facilities for testing the main systems of LUE-200 (FSTF) are used at JINR, BINP, MEPhI and YerPhI [2]. The verification of the linac accelerating system is providing at the VEPP-5 preinjector constructed at BINP [3]. The accelerating system of LUE200 includes two S-band (2856 MHz) accelerating sections of 3 m long. The sections are connected with modulator based one 5045 klystron (SLAC production). There are SLED-systems for the multiplying the pulse RF power. The first results of the accelerating system test on the VEPP-5 preinjector are presented. The electron beam energy up to 92 MeV and consequently average rate of acceleration of the electron beam more than 30 MeV/m were achieved after acceleration in one section., Comment: Linac2000 conference, paper id TUE11

Published
2000

38. PECULIARITIES OF FRACTURE OF WELDED JOINTS OF RAILWAY RAILS OF OXYGEN-CONVERTER K76F STEEL.

Author

Shvets, V. I., Ziakhor, I. V., Kapitanchuk, L. M., Didkovskyi, O. V., and Antipin, E. V.

Subjects
WELDED joints, IRON clusters, FERRIC oxide, IRON oxides, STEEL
Abstract

The fracture surface of rail K76F steel after static bending tests of rail butt joints produced by flash-butt welding was studied. Butt joints of rails of individual batches were fractured on the base metal or heat-affected zone (HAZ). It is shown that in the regions of dark colour and oval shape, the fracture on the iron oxide film takes place. The formation of films occurs as a result of melting and distribution of iron oxide inclusions along the structural boundaries probably in the thermo-deformation conditions of the crimping shop at the stage of blooming production. The formation of clusters of iron oxides occurs during the crystallization of the residual melt in steel ingots with an insufficient degree of deoxidation. Oval regions of dark colour on the fracture surface are evidence of an insufficient degree of deoxidation of rail steel and a factor of its quality reduction. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Prospects for the use of sulfur-containing pteridines in toxic liver damage.

Author

Lohvinenko, N., Shvets, V., Berest, G., Nosulenko, I., Voskoboinik, O., Severina, H., Okovytyy, S., and Kovalenko, S.

Subjects
*PTERIDINES, *PHARMACOKINETICS, *LIPID peroxidation (Biology)
Abstract

The presented material describes the results of the purposeful search for the novel hepatoprotective agents among synthetic sulfur-containing pteridines. The studied compounds were obtained using previously described synthetic procedures. SwissADME and ProTox-II services, as well as a docking study were used to predict the compounds pharmacokinetics, drug-likeness and toxicity. The effects of sulfur-containing pteridines on lipid peroxidation in vitro and GSH/GSSG levels in vivo were studied for evaluation of their hepatoprotective potential. In silico procedures allowed us to exclude the compounds with inappropriate ADME parameters and high predicted toxicity. Molecular docking of the obtained compounds towards the active site of CYP-enzyme allowed us to clarify the specifics of ligand-enzyme interactions and predict cytochrome-inhibiting activity of the studied agents. The antioxidant activity of the studied compounds was evaluated in vitro using the linoleic acid peroxidation model. It has been found that sulfur-containing pteridines inhibit the peroxidation of linoleic acid. The structure - antioxidant activity relationships were evaluated and discussed as well. Additionally, it has been estimated that antioxidant properties of the studied pteridines directly correlate with their hydrophilicity and number of functional groups with exchangeable proton in molecules. In vivo studies showed that some of the studied sulfur-containing pteridines reduced severity of the hepatotoxic effects caused by the administration of carbon tetrachloride. (3-(7-Hydroxy-4-oxo-2-thioxo-1,2,3,4-tetrahydropteridin-6-yl)propanoyl)alanine has been identified as the most active hepatoprotective agent. The above mentioned compound significantly increases the content of GSH and decreases the level of GSSG compared with non-treated experimental pathology, which reliably affirms its hepatoprotective activity. The hepatoprotective activity of the studied compounds is likely associated with their ability to increase the level of GSH, inhibit lipid peroxidation and decrease prooxidant compounds levels. The obtained results attest the reasonability of further search for hepatoprotective agents among sulfur-containing pteridine derivatives. [ABSTRACT FROM AUTHOR]

Published
2024
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