Gomel State Technical University

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.

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.

Khandramai V.L.,Gomel State Technical University | Pasechnik R.S.,Uppsala University | Shirkov D.V.,Joint Institute for Nuclear Research | Solovtsova O.P.,Gomel State Technical University | And 2 more authors.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

We study the polarized Bjorken sum rule (BSR) at low momentum transfers in the range 0.22

Sidorov A.V.,Joint Institute for Nuclear Research | Solovtsova O.P.,Gomel State Technical University
Nonlinear Phenomena in Complex Systems | Year: 2013

We apply analytic perturbation theory to the QCD analysis of the xF3 structure function data of the CCFR collaboration. We use a different approaches for the leading order Q2 evolution of xF3 structure function and compare the extracted values of parameter Λ and the shape of the higher twist contribution. Our consideration is based on the Jacobi polynomials expansion method of the unpolarized structure function. The analysis shows that the analytic approach provides a reasonable results in the leading order QCD analysis.

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.

Chernichenko Y.D.,Gomel State Technical University
Physics of Atomic Nuclei | Year: 2015

A new relativistic form factor for a bound two-particle system was obtained for the case of a vector current. The present consideration was performed within the relativistic quasipotential approach based on the covariant Hamiltonian formulation of quantum field theory by going over to the three-dimensional relativistic configuration representation for the case of interaction between two relativistic spinless particles of arbitrary mass. © 2015, 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.

Kokoulina E.S.,Gomel State Technical University
Journal of Physics: Conference Series | Year: 2015

Study of high multiplicity events in proton-proton (nucleus) interactions is carried out at U-70 accelerator of IHEP, Protvino. These events are extremely rare. Usually, MC codes underestimate topological cross sections in this region. Gluon dominance model has been offered to describe them. Some collective phenomena can be observed in high multiplicity events. SVD-2 Collaboration has obtained the evidence of pion condensate formation at high total multiplicity. Our future program is aimed at studying soft photon yield puzzle at U-70 and Nuclotronfacility at JINR, Dubna. © Published under licence by IOP 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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