
PROBLEMS OF PHYSICS, MATHEMATICS AND TECHNICS N2 (27) 2016
PHYSICS
Akhundova G.A. Study of the reduce of the intensity of the acoustic waves in the ocean
The influence of gas bubbles on the absorption of sound wave in the liquid is investigated. It is shown that the absorption coefficient increas with the increases of viscosity of the liquid phase according to the classical theory of damping. The numerical results showed that the damping of the sound in the gasliquid surrounds aggravated by the fact that the absorbing is getting much stronger exactly at the resonance frequency.
Keywords: gas, bubble, frequency, sound wave, oscillation, sound absorption, density, pressure field, fluctuation damping, volume concentration.
G.A. Akhundova – Azerbaijan State Marine Academy, Baku
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Dostanko A.P., Golosov D.A., Zavadski S.M., Melnikov S.N., Okojie J.E., Kotingo J.D., Ruban G.M. Formation of titanium nitride films by reactive magnetron sputtering under low pressure
The processes of reactive magnetron sputtering of titanium in the atmosphere of
Ar/N_{2} working gases under low pressure were studied. It was established that during high vacuum operating mode of magnetron sputtering system and high pumping rates under conditions of stabilization of the magnetron power the discharge voltage univalently depends on the concentration of nitrogen in the chamber, i. e., the characteristic hysteresis usual for reactive magnetron sputtering processes was not observed. At the same time titanium nitride layers with specific resistance less than
70 cm and microhardness greater than 28 GPa can be obtained with good reproducibility.
Keywords: reactive magnetron sputtering, titanium nitride, microhardness, friction coefficient, volume ware.
A.P. Dostanko – Belarusian State University of Informatics and Radioelectronics, Minsk
D.A. Golosov – Belarusian State University of Informatics and Radioelectronics, Minsk
S.M. Zavadski – Belarusian State University of Informatics and Radioelectronics, Minsk
S.N. Melnikov – Belarusian State University of Informatics and Radioelectronics, Minsk
J.E. Okojie – Belarusian State University of Informatics and Radioelectronics, Minsk
J.D. Kotingo – Belarusian State University of Informatics and Radioelectronics, Minsk
G.M. Ruban – Belarusian State University of Informatics and Radioelectronics, Minsk
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Mityurich G.S., Chernenok E.V., Sviridova V.V., Serdyukov A.N. The formation of photodeflection response in gyrotropic superlattice irradiated by Bessel light beams
The phenomenon of occurrence of photodeflection signal in gyrotropic superlattice by irradiation of Bessel light beams (BLB) was investigated. It was found that the rate of energy dissipation TEmode BLB essentially depends on the radial coordinate
normalized coordinate
BLB taper angle
as well as the frequency of the amplitude modulation
BLB.
Keywords: photodeflection responce, gyrotropic superlattice, Bessel light beam, energy dissipation rate, amplitude of the photodeflection signal, Bessel function, heat equation.
G.S. Mityurich – Department of Physics, F. Skorina Gomel State University
E.V. Chernenok – Department of Physics, F. Skorina Gomel State University
V.V. Sviridova – Department of Physics, F. Skorina Gomel State University
A.N. Serdyukov – Department of Physics, F. Skorina Gomel State University
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Savenko V.S., Silivonec A.G., Ermokovec S.A. Influence of ponderomotive factors on mikrostrukture characteristics of magnesium during elektroplastic deformation
The results of theoretical and experimental research of pulse current influence (density 10^{3} À/mm^{2}, duration 10^{4} s and frequency 600–800 Hz) on the microstructure of magnesium when implementing a multipass electroplastic rolling are presented. The contribution of ponderomotive factors of the own magnetic and electric fields to microstructure modification is examined in conditions of the metal electronic subsystem excitation by external electromagnetic influences.
Keywords: electroplastic deformation, ponderomotive action, pinch effect, skin effect, pulse current, magnetic field, electric field, Vortex field Hall, mechanical pressure, maximum axial force.
V.S. Savenko – I.P. Shamyakin Mozyr State Pedagogical University
A.G. Silivonec – I.P. Shamyakin Mozyr State Pedagogical University
S.A. Ermokovec – I.P. Shamyakin Mozyr State Pedagogical University
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Yarmolenko M.A., Rogachev A.A., Rogachev A.V. Influence of technological processes of forming on the properties of coatings based on polymers deposited from active gas phase (review). 1. Effect of conditions and modes of gas phase generation
The influence of energy and density of electron flux, the introduction into a target of low molecular weight compounds, laser assisting of the dispersion process, the plasma treatment of dispersion products on the molecular structure and properties of coatings based on polymers deposited from the gas phase were analyzed. The effectiveness of regulation of the structure and properties of the coatings by means of the conditions and modes change of the gas phase generation was determined.
Keywords: electron beam dispersion, polymer coatings, assisting laser, plasma treatment.
M.A. Yarmolenko – Department of Physics, F. Skorina Gomel State University
A.A. Rogachev – Department of Physics, F. Skorina Gomel State University
A.V. Rogachev – Rector of F. Skorina Gomel State University
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MATHEMATICS
Burakovski V.V. Symmetric token passing ring local area network with random choice of service discipline
The symmetric tokenpassing ring local area network with N stations in which each station has a finite capacity buffer is studied. When token arrives the ordinary service discipline with the probability p or gated discipline with the opposite probability is on. The message arrival streams at each station are assumed to be independent Poisson processes with the same rates
. The matrixvector system for the steadystate probabilities and main characteristics of the considered network are obtained.
Keywords: tokenpassing ring local area network, station, message, finite capacity buffer, ordinary and gated service discipline, steadystate probabilities.
V.V. Burakovski – Department of Mathematics, F. Skorina Gomel State University
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Lukyanenko V.O. On Hall subgroups of finite groups
Myslovets E.N., Vasil’ev A.F. Finite generalized ñsupersoluble groups and their mutually permutable products
Nesterovich A.V. The nonaxisymmetric termoforces deformation of the circular sandwich plate in the plane
The boundary value problem formulation and general solution for a circular sandwich plate deformed by nonaxisymmetric termoforces load in its plane are given. As an example, the nonaxisymmetric tensioncompression plate cosine load is considered. Numerical testing of solution has been made.
Keywords: threelayer circular plate, thermoelasticity, axially symmetric load.
A.V. Nesterovich – Belarusian State University of Transport, Gomel
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Starovoitov A.P., Kazimirov G.N., Sidorzov M.V. Asymptotics of Hermite – Pade approximation of exponential functions with complex multipliers in the exponent
Asymptotic properties of the diagonal Hermite – Pade approximants of type I for the system of exponentials in which while the rest are the roots of the equation are studied. The theorems complement known results of P. Borwein, F. Wielonsky, H. Stahl, A.V. Astafyeva, A.P. Starovoitov, obtained for the case, where the – different real numbers.
Keywords: exponential system, HermitePad’e approximants, asymptotic equality, Laplace‘s method, saddle point method.
A.P. Starovoitov – Department of Mathematics, F. Skorina Gomel State University
G.N. Kazimirov – Department of Mathematics, F. Skorina Gomel State University
M.V. Sidorzov – Department of Mathematics, F. Skorina Gomel State University
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INFORMATION SCIENCE
Demidenko Î.Ì., Smorodin V.S., Sukach E.I., Zherdetsky Y.V. Automation of project simulation of control systems of the process of production with the elements of potential hazard
The approach to the study of reliability of process control systems of production, including the potential danger elements is presented. Automation means, allowing to build a probabilistic model of the object and to evaluate the reliability of the dynamics in the implementation of the manufacturing cycle are described, taking into account the changes in the reliability of its structural elements.
Keywords: probabilityalgebraic simulation, reliability, safety, control systems, production processes.
Î.Ì. Demidenko – F. Skorina Gomel State University
V.S. Smorodin – Department of Mathematics, F. Skorina Gomel State University
E.I. Sukach – Department of Mathematics, F. Skorina Gomel State University
Y.V. Zherdetsky – Department of Mathematics, F. Skorina Gomel State University
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Kirichenko V.V. Analytical review of compression algorithms of digital information
A brief review and analysis of existing algorithms for compression of digital information are presented. The advantages and disadvantages of data compression algorithms depending on the type of digital information are considered. The software implemented on the basis of the considered algorithms is specified.
Keywords: information, compression, data compression, image compression, algorithm, compression algorithm, archive program, context modeling, encoding of information.
V.V. Kirichenko – United Institute of Informatics Problems of the National Academy of Sciences, Minsk
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Kuznetsov D.I., Kupin A.I. Information system of intellectual control of microclimate in premises
Principles of creation of information intelligent indoor climate control systems based on the requirements and wishes of the subjects are discussed. They allow the effective management of energysaving systems.
Keywords: intelligent system, indoor climate, expert system.
D.I. Kuznetsov – Krivoy Rog National University
A.I. Kupin – Krivoy Rog National University
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Listopad N.I., Mikhnevich S.Yu., Hayder A.A. QoS based routing of information flows in telecommunication networks
Âasic concepts as internetwork and interdomain routing are presented. The developed models and methods of QoS based routing are shown. Based on the analysis of the advantages and disadvantages of the different methods the main trends in the development of QoS based routing are revealed.
Keywords: QoS based routing, bandwidth, network resources.
N.I. Listopad – Belarusian State University of Informatics and Radioelectronics, Minsk
S.Yu. Mikhnevich – Belarusian State University of Informatics and Radioelectronics, Minsk
A.A. Hayder – Belarusian State University of Informatics and Radioelectronics, Minsk
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