Belarusian State Technological University
Minsk, Belarus

Belarusian State Technological University is a University in Minsk, Belarus specialized in engineering and technology. It was established in Gomel in 1930 as the Forestry Institute. In 1941 it was evacuated to Sverdlovsk, now Yekaterinburg. Returned to Gomel in 1944, but in 1946 relocated to Minsk as the Belarusian Institute of Technology. Upgraded to university level in 1993. Currently has 9 departments. Wikipedia.

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Giazitzidis P.,Aristotle University of Thessaloniki | Argyrakis P.,Aristotle University of Thessaloniki | Bisquert J.,Jaume I University | Vikhrenko V.S.,Belarusian State Technological University
Organic Electronics: physics, materials, applications | Year: 2014

We consider a simple model for the geminate electron-hole separation process in organic photovoltaic cells, in order to illustrate the influence of dimensionality of conducting channels on the efficiency of the process. The Miller-Abrahams expression for the transition rates between nearest neighbor sites was used for simulating random walks of the electron in the Coulomb field of the hole. The non-equilibrium kinetic Monte Carlo simulation results qualitatively confirm the equilibrium estimations, although quantitatively the efficiency of the higher dimensional systems is less pronounced. The lifetime of the electron prior to recombination is approximately equal to the lifetime prior to dissociation. Their values indicate that electrons perform long stochastic walks before they are captured by the collector or recombined. The non-equilibrium free energy considerably differs from the equilibrium one. The efficiency of the separation process decreases with increasing the distance to the collector, and this decrease is considerably less pronounced for the three dimensional system. The simulation results are in good agreement with the extension of the continuum Onsager theory that accounts for the finite recombination rate at nonzero reaction radius and non-exponential kinetics of the charge separation process. © 2014 Elsevier B.V. All rights reserved.

Skarpalezos L.,Aristotle University of Thessaloniki | Argyrakis P.,Aristotle University of Thessaloniki | Vikhrenko V.S.,Belarusian State Technological University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We investigate the self-intermediate scattering function (SISF) in a three-dimensional (3D) cubic lattice fluid (interacting lattice gas) with attractive nearest-neighbor interparticle interactions at a temperature slightly above the critical one by means of Monte Carlo simulations. A special representation of SISF as an exponent of the mean tracer diffusion coefficient multiplied by the geometrical factor and time is considered to highlight memory effects that are included in time and wave-vector dependence of the diffusion coefficient. An analytical expression for the diffusion coefficient is suggested to reproduce the simulation data. It is shown that the particles' mean-square displacement is equal to the time integral of the diffusion coefficient. We make a comparison with the previously considered 2D system on a square lattice. The main difference with the two-dimensional case is that the time dependence of particular characteristics of the tracer diffusion coefficient in the 3D case cannot be described by exponentially decreasing functions, but requires using stretched exponentials with rather small values of exponents, of the order of 0.2. The hydrodynamic values of the tracer diffusion coefficient (in the limit of large times and small wave vectors) defined through SIFS simulation results agree well with the results of its direct determination by the mean-square displacement of the particles in the entire range of concentrations and temperatures. © 2014 American Physical Society.

Skarpalezos L.,Aristotle University of Thessaloniki | Tsakiris N.,Aristotle University of Thessaloniki | Argyrakis P.,Aristotle University of Thessaloniki | Vikhrenko V.S.,Belarusian State Technological University
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We investigate in detail the self-intermediate scattering function (SISF) of a lattice fluid (interacting lattice gas) with attractive nearest-neighbor interparticle interactions at a temperature slightly above the critical one by means of Monte Carlo simulations. An analytical expression is suggested to reproduce the simulation data. This expression is the generalization of the hydrodynamic limit with the wave vector, the time-dependent tracer diffusion coefficient, and the lattice geometry factor, instead of the square of the wave vector. The tracer diffusion coefficient is given by its zero wave-vector limit multiplied by the exponent of a function that contains only one fitting parameter describing its wave-vector dependence. In order to represent the time dependence of the SISF and to understand the time scales of the lattice fluid relaxation processes, we use two- and three-exponential fitting functions. The relaxation times group in three well-separated regions around 10, 100, and 1000 Monte Carlo steps and show weak concentration dependence. The analytical expression can also be used to calculate the lattice fluid dynamical structure factor. © 2011 American Physical Society.

Lialko A.,Belarusian State Technological University
2015 Open Conference of Electrical, Electronic and Information Sciences, eStream 2015 - Proceedings | Year: 2015

In this work are considered two analytical method of synthesis of control systems for objects with delay: the discrete aperiodic controller offered in R. Izerman's works and the optimal controller received on the basis of square criterion of quality and Bellman's equation. In the synthesis of discrete aperiodic controller sampling period selection in such a way, that the control signal was limited by the maximum allowable value. Synthesis of the optimal controller was carried out on the basis of tracking a reference signal for state space variables. The delay has been expanded in a Pade series of the second order. Estimation of the state-space variables was made by means of the observer calculated on Akkerman's formula on the basis of desired disposition of the poles. © 2015 IEEE.

Klyndyuk A.I.,Belarusian State Technological University | Chizhova E.A.,Belarusian State Technological University
Glass Physics and Chemistry | Year: 2014

LnBaFe0.5Co0.5CuO5 + δ and LnBaFeCo0.5Cu0.5O5 + δ solid solutions (Ln = Nd, Sm, Gd) are synthesized by the solid-phase method; their structural parameters and oxygen nonstoichiometry are determined; and the thermal expansion, conductivity, and thermal emf of these crystals are investigated. The thermal expansion coefficient of sintered ceramics and its electric transport parameters are calculated. The influence of the nature of rare-earth elements (REE) and 3d metal on the crystal structure, oxygen nonstoichiometry, and physicochemical properties of layered oxides LnBa(Fe, Co, Cu)2O 5 + δ are analyzed. © 2014 Pleiades Publishing, Ltd.

Loiko P.A.,Belarusian National Technical University | Yumashev K.V.,Belarusian National Technical University | Kuleshov N.V.,Belarusian National Technical University | Rachkovskaya G.E.,Belarusian State Technological University | Pavlyuk A.A.,RAS Nikolaev Institute of Inorganic Chemistry
Optical Materials | Year: 2011

Thermooptic coefficients dn/dT for monoclinic potassium (rare-earth) double tungstates KRe(WO 4) 2 (where Re = Gd, Y, Lu, Yb) were determined at eight wavelengths in the range of 0.3-1.1 μm by a laser beam deviation method. In the long-wavelength range all the dn/dT values were found to be negative and near constant, while dn/dT(λ) dependence is especially pronounced in the short-wavelength range where thermooptic coefficients change sign to positive. Linear thermal expansion coefficients were measured in KRe(WO 4) 2 along the optical indicatrix axes by a dilatometric technique. Volumetric thermal expansion effect was found to dominate over the bandgap change influence on temperature dependence of the refractive index. Thermooptic dispersion formulas were derived for KRe(WO 4) 2 as series in 1/λ 2. The influence of Yb and Nd doping on the dn/dT values was investigated, resulting in prediction of thermooptic coefficients evolution in the isostructural KY xYb (1-x)(WO 4) 2 and KYb xLu (1-x)(WO 4) 2 series. © 2011 Elsevier B.V. All rights reserved.

Misyulya D.I.,Belarusian State Technological University
Russian Journal of Non-Ferrous Metals | Year: 2012

An analytical review of recently proposed methods and devices for reducing the pressure loss of cyclone dust collectors is presented. A new design of a blade untwisting device, which decreases the power consumption of the most commonly used TsN-11 and TsN-15 cyclones by 27-29 and 25-27%, respectively, without worsening cleaning quality, is developed. A device with flow recirculation, the application of which results in an increase in cleaning efficiency by ~15% with a decrease in the power consumption of the cyclone, is also proposed. © 2012 Allerton Press, Inc.

Shutko N.,Belarusian State Technological University
Przeglad Elektrotechniczny | Year: 2016

The specifics of algorithmic and software implementation of the steganographic methods that are used to protect of digital documents against unauthorized use are analyzed in this paper. The secret information is embedded in the document-container on the basis of the modification of the parameters of the text characters, such as aprosh and kerning. The efficiency of these methods in comparison with some known methods of syntactic text steganography is analyzed. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.

Markov A.V.,Belarusian State Technological University
Composites: Mechanics, Computations, Applications | Year: 2011

It is shown that in the process of the 3D-forming of sheet, fabric-reinforced thermoplastics, the rheological properties of a material at the processing temperature are responsible for t he stressed-deformed state of the product and, consequently, for the quality of the products obtained. The prediction of the behavior of a material in a viscous-flowing state makes it possible to o ptimize the structure of the reinforced thermoplastics and the parameters of the process of pressin g to at-tain the needed deformation characteristics. The methods of determining the parameters of a power flow of the prepreg at the typical kinds of deformation are suggested. © 2011 by Begell House, Inc.

Lasovsky R.N.,Belarusian State Technological University | Bokun G.S.,Belarusian State Technological University | Vikhrenko V.S.,Belarusian State Technological University
Solid State Ionics | Year: 2011

A lattice fluid model is considered to demonstrate phase transition kinetics and nanostructuring of intercalation compounds. Particles perform thermally activated hops between lattice sites. Attractive nearest neighbor interparticle interactions are taken into account. In this case, when the lattice fluid system temperature is below critical it decomposes into two phases: rarefied phase of low concentration (lattice gas) and condensed phase of high concentration (lattice liquid). The approach based on the nonequilibrium distribution function that depends on time through local values of the chemical potential is used to formulate the kinetic equation for lattice fluid concentration evolution. The nonequilibrium versions of the mean field, quasichemical and diagram approximations are used for representing the two-site distribution functions in terms of the concentration distribution. During evolution, uphill diffusion leads to depleting the layers nearest to the stepwise perturbation. This process creates conditions for uphill diffusion on more distant layers. The process lasts until the nanostructuring closes due to periodic boundary conditions. The system decomposes into nanosized strips of low (lattice gas) and high (lattice liquid) concentration. The final concentration distribution depends on the width and height of the initial perturbation. The process of particle escape from the system is investigated as well. © 2010 Elsevier B.V. All rights reserved.

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