Mahilyow, Belarus

Mogilev State University
Mahilyow, Belarus
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Ogorodnikov V.A.,Mogilev State University | Shcherbina L.A.,Mogilev State University | Bydkute I.A.,Mogilev State University
Fibre Chemistry | Year: 2017

A study was carried out on the adsorption of zinc ions by ion-exchange materials derived from fibrous copolymers of acrylonitrile (AN) with 2-acrylamide-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA), or itaconic acid (ItA) as the ionogenic component. The adsorption activity of materials derived from poly[AN-co-AMPS] containing sulfo groups is somewhat reminiscent of the behavior of carboxyl ion-exchange resins. The amount of zinc adsorbed by materials derived from poly[AN-co-AMPS] may exceed the static exchange capacity (SEC) for sulfo groups. It was proposed that the amide groups affect the adsorption behavior of ion exchangers derived from poly[AN-co-AMPS]. © 2017 Springer Science+Business Media New York

Zagrevskiy V.I.,Mogilev State University | Zagrevskiy V.I.,Tomsk State University | Zagrevskiy O.I.,Tomsk State University
Teoriya i Praktika Fizicheskoy Kultury | Year: 2017

The article considers a mathematical apparatus for computer modelling of pronator/supinator muscle movements in human body and demonstrates how the axial rotation of a biomechanical system link may be formally described using a set of matrix operations profiling rotation of a movable coordinate system around its own axes. Objective of the study was to develop a technological framework for the mathematical provisions and software to visualize by the relevant computer tools the required 3D position and orientation of a biomechanical system. We developed original computer software to visualize the 30 position and axial rotation of a model (rectangular prism) under preset angular orientation parameters. The software was designed using Visual Basic 2010 Express algorithmic language in Visual Studio 2013 interactive design environment. It is the matrix description method in application to the 3D position of the subject plus the matrix multiplication method for presetting the necessary orientation and rotation that were applied to form a mathematical core of the software. The study shows that the human limb rotation and pronation may be modelled by a certain sequence of matrix multiplication operations with the elementary rotation matrixes being multiplied.

Trukhachev F.M.,Belarusian-Russian University | Tomov A.V.,Mogilev State University
Cosmic Research | Year: 2016

This is a theoretical study of the nonequilibrium motion of charged particles in an electric field of solitons. We show that the self-consistent electric field of ion-acoustic and electron-acoustic solitons is characterized by one-way transfer of charged particles at a distance of several Debye radii. The dependence of relevant local currents on the amplitude of solitons is determined. We consider the practically important case of a moving cascade consisting of many solitons and show that the induced currents have a significant constant component. The kinetic energy acquired by charged particles in the soliton field is calculated. The temporal resolution required for the recording of soliton-induced currents is estimated. The calculations presented here can be used to interpret the results of experiments conducted to study solitons in the space plasma. © 2016, Pleiades Publishing, Ltd.

Sotsky A.B.,Mogilev State University | Steingart L.M.,Metricon Corporation | Jackson J.H.,Metricon Corporation | Chudakovskii P.Y.,Mogilev State University | Sotskaya L.I.,Belarusian-Russian University
Technical Physics | Year: 2013

The conditions for prism excitation of leaky modes of thin dielectric films are investigated theoretically and experimentally. The possibility of solving the inverse optical problem on reconstruction of parameters of the films guiding the leaky modes of various types are analyzed. © 2013 Pleiades Publishing, Ltd.

Filatova I.I.,National Academy of Sciences of Belarus | Trukhachev F.M.,Mogilev State University | Chubrik N.I.,National Academy of Sciences of Belarus
Plasma Physics Reports | Year: 2011

The process of decay of dust structures formed of polydisperse grains injected into an RF discharge is investigated. The dust grain velocities after switching-off of the discharge are measured. The number density, dimensions, and residual charges of dust grains are estimated from the balance of forces acting on the grains after discharge is switched off. © 2011 Pleiades Publishing, Ltd.

Malyshev V.L.,Mogilev State University
Theoretical Foundations of Chemical Engineering | Year: 2010

The kinetics of internal mass transfer is determined to a considerable extent by the structural features of porous solids. The purpose of the present work is to study the specificity of the process of moisture removal by evaporation from elastic capillary-porous systems. © 2010 Pleiades Publishing, Ltd.

Malyshev V.L.,Mogilev State University
Journal of Engineering Physics and Thermophysics | Year: 2016

The kinetics of internal mass transfer in the course of evaporation of liquids in elastic capillary systems in which the transverse dimensions of the pores can both decrease and increase on exposure to intense thermal effect is investigated. Structural transformations in a material arise as a result of its dehydration. It is assumed that the channel radius changes simultaneously over the entire length, synchronously with the interface motion. Three schemes are possible in principle: a uniform change during the process, a faster change in the initial stage, and, conversely, a faster change in the closing stage. The time-limited additional thermal effect during the period that makes the main contribution to the overall duration of the process is capable of substantially enhancing mass transfer with minimum energy consumption. © 2016 Springer Science+Business Media New York

Akulich P.V.,A. V. Luikov Heat And Mass Transfer Institute | Akulich A.V.,Mogilev State University | Dragun V.L.,A. V. Luikov Heat And Mass Transfer Institute
International Journal of Heat and Mass Transfer | Year: 2010

The article presents a system of equations of nonstationary wave motion of the disperse phase in a binary vapour-gas medium with account for the heat and mass transfer processes. The effect of pulsations of moist air and superheated steam on motion of gas suspension and rate of heat and mass transfer under the conditions of wave and resonance modes has been investigated in the course of the computational experiment. In particular, it is shown that in the range of the parameters studied gas pulsations lead to enhancement of interphase heat and mass transfer. Use of superheated vapour as a carrying phase results in heat and mass transfer enhancement compared with moist air. An analytical expression has been obtained for determining the frequency of gas velocity oscillations in a low-frequency region, at which maximum intensity of heat transfer is attained. A schematic of the pneumatic setup equipped with the chamber of pulse combustion with an aerodynamic valve is presented. © 2010 Elsevier Ltd. All rights reserved.

Khasanshin T.S.,Mogilev State University | Samuilov V.S.,Mogilev State University | Shchemelev A.P.,Mogilev State University
High Temperature | Year: 2010

Data on sound velocity are used for determining the density, the isobaric expansion coefficient, the isobaric and isochoric heat capacity, and the isothermal compressibility of liquid binary mixture of n-decane + n-hexadecane of three compositions in the temperature range of 298-433 K and pressure range of 0.1-100 MPa. The coefficients of Tait equation are calculated in the above-identified range of parameters. The calculation results are compared with experimental data on density. The divergence does not exceed 0.2% for the most reliable data. © 2010 Pleiades Publishing, Ltd.

Dymova L.,Czestochowa University of Technology | Sevastjanov P.,Czestochowa University of Technology | Tkacz K.,Czestochowa University of Technology | Cheherava T.,Mogilev State University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

Based on the critical analysis of methods for evaluation of conflict between basic probability assignments (bpas) to be combined and combination rules in the Dempster-Shafer theory of evidence, a new simple, but reliable method for the evaluation of conflict between combining bpas is proposed and analysed. Using some critical examples, it is shown that the proposed approach performs better than Dempster's rule and the known hybrid rule based on the weighted sum of conjunction and disjunction operators. It is shown that in the case of small conflict, the use of averaging rule for combination of bpas seems to be a best choice. © 2014 Springer International Publishing.

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