
PROBLEMS OF PHYSICS, MATHEMATICS AND TECHNICS N2 (3) 2010
PHYSICS
Maksimenko N.V., Kuchin S.M. Spectral problem of the KleinGordonFock equation
The eigenvalues and eigenfunctions of the relativistic bound system based on KleinGordonFock equation with a mixed, scalarvector coupling are determined.
Keywords: relativistic bound system, eigenvalues and eigenfunctions.
N.V. Maksimenko – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
S.M. Kuchin – Department of Physics and Mathematics I.G. Petrovski Briansk State University, Briansk, Russia
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Yarmolenko M.A., Rogachåv A.A., Rogachåv A.V., Gorbachyov D.L. Molecular structure and morphology of the polyethylene coatings alloyed when forming from gas phase by lowmolecular compound
The molecular structure and morphology of the polyethylene coatings, which inherently contain functional additions, are defined. It was established that the coatings that were received by electron beam dispersion have higher transvinylene nonsaturation and bigger size of permolecular formations in comparison with the coatings that were received by thermal dispersion. On the basis of the data analysis of the influence of the filling material nature on molecular structure of the compositional layers, formed by electron beam method, an assumption of the influence of ionmolecular processes alongside with free radical processes on secondary polymerization was made.
Keywords: morphology, molecular structure, polyethylene, infrared spectroscopy, compositional coatings.
M.A. Yarmolenko – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
A.A. Rogachev – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
A.V. Rogachev – Rector of F. Skorina Gomel State University, Gomel, Belarus
D.L. Gorbachyov – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
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MATHEMATICS
Vasilyev A.F., Vasilyeva T.I., Tyutyanov V.N. On finite groups similar to supersoluble groups
A subgroup H of G is called Psubnormal in G if either H = G or there is a chain such that
H_{i+1} : H_{i}
is a prime number for every i = 0, 1, … , n1. For the set of primes the properties of supersoluble groups G, i.e. groups for which for every Sylow psubgroup is Psubnormal in G are investigated. It is proved that the class of all supersoluble groups is a normally hereditary formation, and the class of all soluble supersoluble groups is a hereditary saturated formation. The properties of the groups, which are the product of Psubnormal subgroups are obtained.
Keywords: finite group, Psubnormal subgroup, supersoluble group, formation, saturated formation.
A.F. Vasilyev – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
T.I. Vasilyeva – Belarusion State University of Transport, Gomel, Belarus
V.N. Tyutyanov – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
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Vasilyev V.A., Skiba A.N. New characterizations of finite soluble groups
A subgroup H of a group G is called modular in G if H is a modular element (in sense of Kurosh) of the lattice L(G) of all subgroups of G. The subgroup of H generated by all modular subgroups of G contained in
H is called the modular core of H and denoted by . In the paper, we introduce the following concepts. A subgroup H of a group G is called msupplemented (msubnormal) in G if there exists a subgroup (a subnormal subgroup respectively) K of G such that G=HK and . We proved the following theorems.
Theorem A. A group G is soluble if and only if each Sylow subgroup of G is msupplemented in G.
Theorem B. A group G is soluble if and only if every its maximal subgroup is msubnormal in G.
Keywords: finite group, soluble group, subnormal subgroup, modular subgroup, modular core, msupplemented subgroup, msubnormal subgroup.
V.A. Vasilyev – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
A.N. Skiba – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
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Gabasov R., Kuzmenkov D.S. Optimal control problem of a thermal process in the rod under uncertainties
An optimal control problem of a thermal process in the rod under uncertainties is considered. The proposed solution method is the reduction to linear system optimal observation problems and optimal control of the determinate system on the obtained evaluations. Operating algorithm of the optimal allocation regulator that forms optimal feedback in real time current values is described.
Keywords: thermal process, optimal feedback on allocation, optimal control problem, principle of divisibility.
R. Gabasov – Department of Applied Mathematics and Information Science, Belarusian State University, Minsk, Belarus
D.S. Kuzmenkov – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
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Lubochkin A.V. Solution of the classical regulation problem by optimal controls of linearquadratic problems
The basic problem of the classical regulation theory in the bounded control class is considered. Optimal control methods are used to construct the regulator work algorithm. These methods perform feedback implementation in the realtime mode. The feedback transfers the system from one equilibrium condition vicinity into another one with high transient quality. It stabilizes the system according to the new equilibrium condition. To solve the problem the feedback optimal control realization of linearquadratic problem with restrictions is suggested. The results are illustrated with the example of the linear dynamical system regulation of the fourth order.
Keywords: dynamic system, regulation problem, bounded stabilizing feedback, auxiliary optimal control problem, regulator.
A.V. Lubochkin – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
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Mozharovsky V.V., Marjina N.A. Mathematical modeling of nanocontact interaction of orthotropic bodies
The elastic problem of application of the theory of contact interaction in system «scanning probe – orthotropic sample» for both homogeneous elastic body and orthotropic coating is considered. Analytical dependences and the graphs facilitating search and finding contact.
Keywords: contact, orthotropic body, nanocontact, coating, composite, model.
V.V. Mozharovsky – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
S.A. Marjina – Belarusion State University of Transport, Gomel, Belarus
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Fan Cheng, Jianhong Huang, Wenjuan Niu, Lifang Ma The influence of scpermutably embedded subgroups on the structure of finite groups
A subgroup H of a group G is said to be scpermutably embedded in G if every Sylow subgroup of H is a Sylow subgroup of some sconditionally permutable subgroup of G. In this paper, some new characterizations for a finite group to be psupersoluble or pnilpotent are obtained under the assumption that some of its maximal subgroups or 2maximal subgroups of Sylow subgroups are scpermutably embedded. A series of known results are generalized.
Keywords: finite group, scpermutably embedded subgroups, 2maximal subgroups, Sylow subgroup, psupersoluble group, pnilpotent group.
Fan Cheng – Department of Mathematics, Xuzhou Normal University, Xuzhou, China
Jianhong Huang – Department of Mathematics, Xuzhou Normal University, Xuzhou; Department of Mathematics, University of Science and Technology of China, China
Wenjuan Niu – Department of Mathematics, Xuzhou Normal University, Xuzhou, China
Lifang Ma – Department of Mathematics, Xuzhou Normal University, Xuzhou, China
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TECHNICS
Golosov D.A., Melnikov S.N., Kundas S.P., Dostanko A.P. Prediction of targets erosion in magnetron sputtering systems
The method of prediction of targets erosion in magnetron sputtering systems is suggested. The method based on the evaluation of the effective ionization zone for the working gas atoms, approximate concentration of the charged particles, and an assumption that the concentration of ionizing events at each point of the plasma volume is proportional to the horizontal component of magnetic field intensity to the magnetic field intensity square. For the practical implementation of the suggested model the software tool TargProf has been developed capable of calculating the magnetic field configuration with the aid of the ELCUT package, generating output data matrices, and analyzing the results obtained. The TargProf enables to predict the profile of the erosion zone on a target at the stage of the magnetron system design with the error not exceeding 15–20% (depending on the magnetron configuration).
Keywords: magnetron sputtering system, erosion zone, plasma discharge, magnetic field, modeling of discharge.
D.A. Golosov – Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
S.N. Melnikov – Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
S.P. Kundas – Rector of International Sakharov Environmental University, Minsk, Belarus
A.P. Dostanko – Department of ComputerAided Design Belarusian State University of Informatics and Radioelectronics, Minsk, Belarus
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Muravsky A.A., Agabekov V.E., Malashko P.M., Matsur A.I. New optical functional materials based on alkaline metalls salts of 5(2{4[2(3carboxy4hydroxyphenyl)diazenyl]phenyl}diazenyl)2hydroxybenzenecarboxylic acid
New functional materials – layers of nanosized thickness based on alkaline salts of azodyes are developed. The layers form hydrophilic photoinduced anisotropic surfaces for epitaxial growth and photoalignment of liquid crystals – the mesogenic systems. It is shown that sodium and potassium salts of 5(2{4[2(3carboxy4hydroxyphenyl)diazenyl]phenyl}diazenyl)2hydroxybenzenecarboxylic acid demonstrate marked difference in reorientation dynamics of LC photoalignment direction. Based on the new materials the optically addressable liquid crystal indicator is realized, and the possibility of creation of polarization optical logic gate is demonstrated.
Keywords: photoalignment, organic epitaxy, nanolayer, functional materials.
A.A. Muravsky – Institute of Chemistry of New Materials NAS Belarus, Minsk, Belarus
V.E. Agabekov – Director of Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus, Minsk, Belarus
P.M. Malashko – Institute of Chemistry of New Materials NAS Belarus, Minsk, Belarus
A.I. Matsur – Institute of Chemistry of New Materials NAS Belarus, Minsk, Belarus
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Sukach E.I., Ratobylskaya D.V., Mereja V.L. Probabilityalgebraic simulation of the characteristics of mechanical systems reliability
In the paper the probabilityalgebraic simulation method allowing investigation the reliability of mechanical systems is considered. The method takes into account the probability nature of the damages accumulated by the system components. It demonstrates the statistical property of damages of the interference while in service systems.
Keywords: probabilityalgebraic simulation, reliability of mechanical system, algebra, uncertainty of the data, uncertainty of operations.
E.I. Sukach – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
D.V. Ratobylskaya – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
V.L. Mereja – Department of Mathematics, F. Skorina Gomel State University, Gomel, Belarus
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Zhu Peng, Fedosenko N.N., Piliptsov D.G., Bekarevich R.V. Study of the preparation CuO and boron films
The use of ion beam source sputtering, CuO and B films were deposited successively. The deposition speeds are 11 nm/min and 11.8 nm/min, respectively. The purity and morphology of the asprepared films were investigated by power Xray diffraction and atomic force microscopy. Thus it is can be seen that the sizes of the films were more homogeneous in B than CuO.
Keywords: atomic force microscopy, boron, ion beam source sputtering, hot isostatic pressing, Xray diffraction
Zhu Peng – Nanjing University of Science and Technology, Nanjing, China
N.N. Fedosenko – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
D.G. Piliptsov – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
R.V. Bekarevich – Department of Physics, F. Skorina Gomel State University, Gomel, Belarus
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