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Orlenko Fedor E., Zegrya Georgiy G.

Metal — insulator transition in a nonmagnetic InSb crystal semiconductor in the magnetic field

Published in category «Condensed matter physics»

A Hamiltonian of the exchange interaction in the spin representation is developed for the couples of particles with spins equal to 3/2. The ground antiferromagnetic state is degenerated in respect to the total spin of the acceptor couple. The degeneracy is removed by a strong magnetic field that induces a transition into a magnetic and (at the same time) a conducting state.

Views: 1924 Comments: 0

Emelyanov Victor M., Kalyuzhniy Nikolai A., Mintairov Mikhail A., Mintairov Sergei A., Shvarts Maxim Z., Lantratov Vladimir M.

Optimization of the concentrator three-junctional solar cells

Published in category «Condensed matter physics»

The influence of epilayer structure parameters of tandem GalnP/GalnAs/Ge solar cells on sunlight conversion efficiency has been investigated. The optimal choice of thicknesses and doping levels of emitters of GalnP and GalnAs subcells were shown to allow to improve efficiency of the solar cells up to 4 %.

Views: 1767 Comments: 0

Zelikman Mark A., Potseluev Kirill A.

The influence of structural factor on the Meissner state in the 3D-ordered Josephson medium

Published in category «Condensed matter physics»

The system of difference equations based on the conditions of fluxoid quantization in the cells is obtained. A method of solutions of the system for the Meissner configuration for all values of parameters is proposed. The current configurations as well as the critical field above which the Meissner configuration does not exist are calculated.

Views: 1410 Comments: 0

Nemov Sergei A., Filippov Stanislav I.

Calculation of parameters of tin impurity states in bismuth telluride using the Hall effect data

Published in category «Condensed matter physics»

Basing on experimental temperature dependence of the Hall factor in telluride bismuth crystal doped with tin and iodine, chemical potential of holes and energy of two-electron impurity states of tin have been calculated within framework of two-band model at the temperature range of 77—330 K. Coefficient of temperature drift of tin two-electron level relatively the top of the valence band and value of Hubbard energy were estimated.

Views: 1368 Comments: 0

Ganin Pavel G., Schmidt Alexander A.

Theoretical estimation of the diameter of the droplets formed in a breakup of the largest droplets in the process vessel with stirring

Published in category «Simulation of physical processes»

In a liquid-liquid system with mechanical stirring a mechanism of fine droplets fraction formation doesn't have complete theoretical explanation. The paper presents a theoretical estimation of a diameter of the smallest daughter droplets formed in the process vessel in a breakup of largest droplets of polydispersed emulsion.

Views: 1697 Comments: 0

Pletnev Alexander A., Talalov Victor A.

Mathematical model of heat and mass transfer in the electric furnace molten slag bath

Published in category «Simulation of physical processes»

Both mathematical model and economical calculation algorithm for numerical simulation of the heat and mass transfer processes in the molten slag bath of the rectangular electric smelting furnace have been carried out. The high intensive operational conditions of the furnace are investigated.

Views: 1796 Comments: 0

Snegirev Aleksandr Yu., Sazhin Sergei S., Talalov Victor A.

A model and computational algorithm for heat exchange and evaporation of droplets of dispersed liquid

Published in category «Simulation of physical processes»

The model of unsteady nonisothermal droplet vaporization of atomized liquid is formulated, taking into account the temperature gradient and liquid recirculation inside the droplet. An efficient and absolutely stable algorithm is developed for further use in numerical simulations of turbulent evaporating sprays.

Views: 1693 Comments: 0

Krivtsun Alexander M., Seteikin Alexey Yu.

An analysis of light propagation process in biological media using graphics processing units technique

Published in category «Simulation of physical processes»

A number of issues arising when solving task of numerical simulating of light propagation process has been considered. Numerical results for media with different sets of optical properties are presented and validated against other groups. A new approach towards increasing of calculating performance is presented.

Views: 1446 Comments: 0

Verkhovtsev Alexei V., Polozkov Roman G., Ivanov Vadim K., Korol Andrei V., Solov'yov Andrei V.

An investigation of the electronic structure of noble gas endohedral fullerenes

Published in category «Atom physics and physics of clusters and nanostructures»

The results of the first self-consistent calculation of the electronic structure of endohedral compounds He@C60, Ne@C60 and Ar@C60 within the Hartree—Fock approximation are presented. The influence of the exchange electron-electron interaction on the hybridization process is studied.

Views: 2059 Comments: 0

Kozlov Vladimir N., Trofimov Pavel A., Akimov Alexei I.

The inverse Hankel transformation for the mixed boundary value problem in the closed interval

Published in category «Mathematics»

The formula of the inverse Hankel transformation for the mixed boundary value problem for requirements of the first and the third sort is gained. Connection with a solution of the mixed problem for requirements of a first labour is considered.

Views: 1782 Comments: 0

Ivanov Yuri F., Nevskiy Sergei A., Konovalov Sergey V., Gromov Victor Е.

The influence of electrical potential on changing a dislocation substructure of aluminium at a stress relaxation

Published in category «Experimental technique and devices»

Aluminium samples tested for stress relaxation both under normal conditions and under electrical potential have been investigated using transmission diffraction electron microscopy. An essential change of dislocation substructure parameters was revealed.

Views: 1468 Comments: 0

Elizarova Marina V., Mironov Vladimir O.

An estimation of inaccuracy in dosimetric data smoothing when installing the remote radiation therapy planning system

Published in category «Experimental technique and devices»

Smoothing errors of dosimetric data due to preparation for radiation therapy treatment planning system are considered. Parametrization and numeric estimation of those errors are performed. Practical recommendations concerning smoothing procedure during experimental dosimetric data preparation are given.

Views: 1494 Comments: 0

Charikov Yuri E., Sklyarova Elena M.

The concept of the origin of thermal flares on the Sun

Published in category «Astrophysics»

The paper formulates the main items underlying the concept of the origin of thermal flares on the Sun which generate X-rays in the 1-8 A range with a power not above 10~ Вт/м. An analysis of the data amassed for the flare provides convincing support for the concept proposed.

Views: 1345 Comments: 0

Nesterenok Alexander V., Naidenov Victor O.

The simulation of propagation of cosmic rays nucleonic component in the Earth's atmosphere

Published in category «Astrophysics»

The paper is devoted to statistical simulation of propagation processes of secondary cosmic rays and its interaction with the Earth's atmosphere. We present the simulation results of integral and differential fluxes of cosmic rays nucleons. The comparison between our results and experimental data is done.

Views: 1315 Comments: 0

Kropotina Yuliya A., Gustov Maxim Yu., Krasil’shchikov Alexander M., Levenfish Kseniya P., Pavlov Georgiy G.

Multiprocessor 3D-hybrid code for astrophysical plasma modeling

Published in category «Astrophysics»

An original multiprocessor 3D divergence-free hybrid code is presented. The code allows for efficient modeling of collisionless processes in plasma on the scale of ion gyroradii. An example of resonant electromagnetic ion-ion instability simulation is provided.

Views: 1553 Comments: 0

Bykov Andrey M., Gladilin Petr E., Osipov Sergey M., Pavlov Georgiy G.

A new class of galactic X-ray sources resulting from interaction of stellar wind with a supernova remnant

Published in category «Astrophysics»

A model of energetic particle acceleration in the vicinity of expanding supernova shell and of young massive star having powerful stellar wind has been considered. The source was shown to be characterized by unusually hard spectral energy distribution in X- and gamma-ray energy bands.

Views: 1439 Comments: 0

Golovitski Alexander P.

The low-current low-pressure glow discharge in the electronegative gases

Published in category «Physical electronics»

The physical mechanisms of the existence of two stages of glow discharge in the electronegative gases have been analysed. The electron attachment is shown to be the main mechanism of electron decay at the low-current stage, whereas the diffusion-aided removing — to be that at the high-current stage.

Views: 1295 Comments: 0

Nguyen Van Thang

Forces and moments acting on a rapidly rotating floating bearing with allowance of lubrication hydrodynamics and centrifugal force

Published in category «Mechanics»

The problems of theoretical representation of questions of forces and moments acting on a rapidly rotating floating bearing with allowance of centrifugal force and oil hydrodynamics. The basic results are given with reference to research of short bearing.

Views: 1460 Comments: 0

Zhgutov Vladimir M.

Mathematical models, the research algorythm and the ribbed shells steadiness analysis at finite bending flexure

Published in category «Mechanics»

The mathematical deformation models and the algorithm of the elastic ribbed shells research accounting geometrical nonlinearity, shifting and bending rigidity of the ribs, and the transverse shifts are proposed. The examples of the solutions for the metal, organic-glass and concrete shells are given. The critical load for the elastic behavior of the material is estimated.

Views: 1578 Comments: 0

Kesamanly Fagam P.

Andrey Dmitrievich Sakharov (on the occasion of his 90th birthday)

Published in category «Chronicle»

Views: 1491 Comments: 0