Gomel State Technical University

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Homyel', Belarus
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Asenchik O.D.,Gomel State Technical University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2017

A method of approximate calculation of the interaction inverse matrix in the method of discrete dipoles is proposed. The knowledge of this matrix makes it possible to determine the optical response of a system to the action of an electromagnetic wave with an arbitrary shape, which can be represented as a combination of vector spherical wave functions. The number of calculation operations of the matrix in the proposed method is considerably smaller than in the case of its direct calculation. In the case of a change in the refractive index of scattering particles, two methods of approximate calculation of the interaction inverse matrix are also proposed. This makes it possible to calculate the optical response of systems with new characteristics without direct solving equations of a system with a large dimension. The accuracy of the methods is numerically determined for particles with spherical and cubic shapes. It is shown that the methods are computationally efficient and can be used to calculate the values of polarization vectors inside particles and extinction and absorption cross sections of systems. © 2017, Pleiades Publishing, Ltd.


Shablovskii Y.O.,Gomel State Technical University
Russian Journal of Physical Chemistry A | Year: 2017

Expressions are derived for the Gibbs and free energies of a liquid–vapor system. The critical parameters of the liquid are determined, and the character of the relationship between them is found. The temperature dependence of the vaporization heat is found. The analytical expression of the empirical Tait rule is substantiated. General patterns of subcritical and critical equilibria were revealed. A geometric definition of a critical state is proposed, and the existence of two critical states is proven. © 2017, Pleiades Publishing, Ltd.


Solovtsova O.P.,Gomel State Technical University
Physics of Atomic Nuclei | Year: 2017

We discuss applications of the method based on the variational perturbation theory to perform calculations down to the lowest energy scale. The variational series is different from the conventional perturbative expansion and can be used to go beyond the weak-coupling regime. We apply this method to investigate the Borel representation of the light Adler function constructed from the τ data and to determine the residual condensates. It is shown that within the method suggested the optimal values of these lower dimension condensates are close to zero. © 2017, Pleiades Publishing, Ltd.


Stepankin I.N.,Gomel State Technical University
Journal of Friction and Wear | Year: 2017

Results of studying the effect of strengthening a HSS 6-5-2 steel surface on its resistance to the contact wear have been presented in the paper. It has been proved that the oriented structurization of carburized layers is ensured by the final conditions of the heat treatment. The given structure and surface properties are formed, which enables the resistance of tools for cold stamping to be increased. © 2017, Allerton Press, Inc.


Chernichenko Y.D.,Gomel State Technical University
Physics of Atomic Nuclei | Year: 2017

Exact solutions of relativistic quasipotential equations in the configuration representation were found for a system of two spin-1/2 quarks interacting via a Coulomb-like chromodynamical potential. Quantization conditions were found for the pseudoscalar, pseudovector, and vector cases. The present analysis was performed within the Hamiltonian formulation of quantum field theory via a transition to the relativistic configuration representation for the case of two relativistic spin-1/2 quarks of equal mass. © 2017, Pleiades Publishing, Ltd.


Bakulev A.P.,Joint Institute for Nuclear Research | Khandramai V.L.,Gomel State Technical University
Computer Physics Communications | Year: 2013

We provide here all the procedures in Mathematica which are needed for the computation of the analytic images of the strong coupling constant powers in Minkowski (A ν(s; nf) and Aνglob(s)) and Euclidean (A ν( Q2; nf) and Aνglob( Q2)) domains at arbitrary energy scales (s and Q2, correspondingly) for both schemes - with fixed number of active flavours nf=3,4,5,6 and the global one with taking into account all heavy-quark thresholds. These singularity-free couplings are inevitable elements of Analytic Perturbation Theory (APT) in QCD, proposed in [10,69,70], and its generalization - Fractional APT, suggested in [42,46,43], needed to apply the APT imperative for renormalization-group improved hadronic observables. © 2012 Elsevier B.V. All rights reserved.


Shablovskii Y.O.,Gomel State Technical University
Theoretical Foundations of Chemical Engineering | Year: 2013

The chemical and thermal components of exergy of solid-phase reaction systems have been analyzed. Chemical exergy is the measure of energy maintenance of chemical reaction; therefore, chemical exergy is intrinsic, not for a particular substance, but rather for a reaction mixture with a particular composition. The temperature dependence of the chemical exergy of the exothermic reaction mixture has a maximum and the temperature dependence of the chemical exergy of endothermic reaction mixture has a minimum. Equations for calculating the exergy components have been suggested, which assume the possibility of the presence of structural polymorphism for the crystal components of reaction mixture. © 2013 Pleiades Publishing, Ltd.


Andreev V.V.,Gomel State University | Pankov A.A.,Gomel State Technical University
Physics of Atomic Nuclei | Year: 2012

An analysis of effects induced by new neutral gauge Z′ bosons was performed on the basis of data from the OPAL, DELPHI, ALEPH, and L3 experiments devoted to measuring differential cross sections for the process of the annihilation production of pairs of charged gauge W± bosons at the LEP2 collider. By using these experimental data, constraints on the Z′-boson mass and on the angle of Z-Z′ mixing were obtained for a number of extended gauge models. © 2012 Pleiades Publishing, Ltd.


Solovtsova O.P.,Gomel State Technical University
Physics of Atomic Nuclei | Year: 2013

A nonperturbative approach based on the variational perturbation theory in quantum chromodynamics is developed. The variational series is different from the conventional perturbative expansion and can be used to go beyond the weak-coupling regime. The approach suggested takes into account the summation of threshold singularities and the involvement of nonperturbative light quark masses. Phenomenological applications of this approach to describe physical quantities connected with the hadronic τ-decay data: the R τ ratio, the light-quark Adler function, and the smeared R Δ function are presented. The description of examined quantities includes an infrared region and, therefore, they cannot be directly calculated within the standard perturbation theory. It is shown that in spite of this fact the approach suggested gives a rather good result for these quantities down to the lowest energy scale. © 2013 Pleiades Publishing, Ltd.


Ostrikov O.M.,Gomel State Technical University
Physics of Metals and Metallography | Year: 2012

The process of the coalescence of twin boundaries in bismuth single crystals has been studied. It has been established that the twin coalescence can occur without the formation of an interface between them or with the formation of a double twin boundary, depending on the direction of twin growth and orientation of twinning planes. © Pleiades Publishing, Ltd., 2012.

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