Omsk, Russia

Omsk State Technical University in Omsk, Russia, is one of the leading educational institutions in the Western Siberian Region. It is alma mater to thousands of professionals who now work at industrial enterprises in the Siberian region.The university was founded in 1942, as Omsk Machine Building Institute. It was the evacuated version of the machine-building institute from Luhansk, Ukrainian SSR . In 1963, the Omsk Machine Building Institute was renamed the Omsk Polytechnic Institute: 7 Faculties, 5900 students, 210 professors and instructors. In 2006 the institute was renamed the Omsk State Technical University.At present the university has 4 institutes, 8 faculties, Military Chair, 843 instructors, 14000 students, 8 buildings, Sport centers, 8 Hostels, Publishing House, Medical Center, Sport Camp. There are 63 Doctors of Science and 394 PhD working at the University. The current university rector is Victor Shalay. Wikipedia.

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Gontchar I.I.,Omsk State Technical University | Bhattacharya R.,University of Calcutta | Chushnyakova M.V.,Omsk State Technical University
Physical Review C - Nuclear Physics | Year: 2014

We calculate the capture (fusion) cross sections for nine reactions involving spherical nuclei: O16+O16, Si28, Zr92, Sm144, Pb208; Si28+Si28, Zr92, Pb208; S32+Pb208. For six of them precision data are available in the literature. Analysis of these precision data within the framework of the single-barrier penetration model based on the Woods-Saxon profile for the strong nucleus-nucleus interaction potential (SnnP) gave rise to the problem of the apparently large diffuseness of the SnnP [Newton, Phys. Rev. C 70, 024605 (2004)PRVCAN0556-281310.1103/PhysRevC.70.024605]. Our fluctuation-dissipation trajectory model is based on the double-folding approach with the density-dependent M3Y NN forces including the finite-range exchange part. For the nuclear matter density the Skyrme-Hartree-Fock approach including the tensor interaction is applied. The resulting nucleus-nucleus potential possesses rather small (normal) diffuseness. The strength of the radial friction KR is used as the free parameter of the model. It turns out that for four of the five reactions induced by O16 (except O16+Pb208) the calculated cross sections cannot be brought into agreement with the data within the experimental errors. This suggests that the calculated nuclear density is incorrect for O16. For the reactions not involving O16 and, surprisingly, for the O16+Pb208 reaction the agreement with the data within 2-5% is achieved at KR=1.2×10-2 to 3.0×10-2MeV-1zs which is in accord with the previous works. © 2014 American Physical Society.

Zadorozhnyi V.N.,Omsk State Technical University | Yudin E.B.,Omsk State Technical University
Physica A: Statistical Mechanics and its Applications | Year: 2015

We investigate the preferential attachment graphs proceeding from the following two assumptions. The first one: the probability that a new vertex connects to a vertex i is proportional to an arbitrary nonnegative function f of a vertex degree k. The second assumption: a new vertex can have a random number of edges. We derive formulas for any f to determine the vertex degree distribution {Qk} in generated graphs. The inverse problem is solved: we have obtained formulas, that allow from a given distribution {Qk} to determine f (the problem of a model calibration). The formulas allowing for any f to calculate the joint distribution of vertex degrees at the ends of randomly selected edge are also obtained. Some other results are presented in the paper. © 2015 Elsevier B.V. All rights reserved.

Khachay M.,Omsk State Technical University
Machine Learning | Year: 2015

We consider the minimum affine separating committee (MASC) combinatorial optimization problem, which is related to ensemble machine learning techniques on the class of linear weak classifiers combined by the rule of simple majority. Actually, the MASC problem is a mathematical formalization of the famous Vapnik–Chervonenkis principle of structural risk minimization in the mentioned class of classifiers. According to this principle, it is required to construct a best performance ensemble classifier belonging to a family of the least possible VC-dimension. It is known that the MASC problem is NP-hard and remains intractable in spaces of any fixed dimension n > 1 even under an additional constraint on the separated sets to be in general position. This special case of the MASC problem called MASC-GP(n) is the main subject of interest of the present paper. To design polynomial-time approximation algorithms for a class of combinatorial optimization problems containing the MASC problem, we propose a new framework, adjusting the well-known Multiple Weights Update method. Following this approach, we construct polynomial-time approximation algorithms with state-of-the-art approximation guarantee for the MASC-GP(n) problem. The results obtained provide a theoretical framework for learning a high-performance ensembles of affine classifiers. © 2015, The Author(s).

Surovikin Yu.V.,Omsk State Technical University
Procedia Engineering | Year: 2015

Carbon-carbon (C/C) nanocomposites based on nanodispersed carbon black and pyrolytic carbon obtained with matrix synthesis are investigated. The work presents the results of electrochemical tests on prototype samples of C/C nanocomposites as the components of electrochemical capacitors electrodes with the solutions of sulphuric acid (H2SO4) in water and tetraethylammonium tetrafuoroborate (TEABF4) in acetonitrile acting as electrolytes. The research demonstrated the interrelation of the electrode components size factor and the supercapacitor electrochemical properties, and also the prospects of C/C nanocomposites application as the basis for supercapacitors electrodes with high-energy electrolytes. © 2015 Published by Elsevier Ltd.

Rybalov A.,Omsk State Technical University
Theory of Computing Systems | Year: 2016

Hamkins and Miasnikov presented in (Notre Dame J. Formal Logic 47(4), 515–524, 2006) a generic algorithm deciding the classical Halting Problem for Turing machines with one-way tape on a set of asymptotic probability one (on a so-called generic set). Rybalov (Theor. Comput. Sci. 377, 268–270, 2007) showed that there is no generic algorithm deciding this problem on strongly generic sets of inputs (some subclass of generic sets). In this paper we prove that there is no generic algorithm deciding the Halting Problem for normalized Turing machines on generic sets of inputs. Normalized Turing machines have programs with the following natural restriction: internal states with large indices are not allowed at the beginning of the program. This condition does not reduce the class of computable functions because for every Turing machine there exists a normalized Turing machine which computes the same function. Our proof holds for machines with one-way and two-way tape. It also implies that the Hamkins-Miasnikov algorithm is not generic for normalized Turing machines. © 2016 Springer Science+Business Media New York

Based on the generalization of experimental data on the structure, properties, adsorption and electrical properties of diamond-like semiconductors, the systematic features of variation in their crystalchemical, electrical, and surface (adsorption and electrical) properties depending on the energy of the reverse adsorption piezoelectric effect is established for the first time. It is noted that this energy coincides with the energy of formation and annihilation of point defects in solids, which is determined by the dilatometric and calorimetric methods. Empirical formulas for variation in the band gap, melting point, and microhardness depending on the energy density in oxygen are found for II-VI compounds. Based on the found systematic feature, the values of the microhardness for the semiconductor materials HgS, HgSe, and Cd 0.12Hg 0.88Te, which are lacking in published data, are found. © 2012 Pleiades Publishing, Ltd.

Fedyaeva O.A.,Omsk State Technical University
Semiconductors | Year: 2012

The structure and chemical composition, and also the adsorption, electrical, and optical properties of the surface of Cd xHg 1 - xTe system solid solutions have been studied; the existence of the previously unknown phenomenon of the inverse adsorption piezoelectric effect has been established. Using the semiconductor compounds CdTe and Cd 0. 2Hg 0. 2Te as an example, it is shown that adsorption-induced charging of the surface causes the relaxation of charges localized at slow surface states which manifests itself in the form of voltage pulses and governs structural reconstructions and surface relaxation. © 2012 Pleiades Publishing, Ltd.

Magazev A.A.,Omsk State Technical University
Russian Physics Journal | Year: 2014

The algebra of the integrals of motion, linear in the momenta, of magnetic geodesic flows on arbitrary Riemannian manifolds is investigated. It is shown that the indicated algebra is a one-dimensional central extension of the Lie algebra of Killing vector fields of the manifold which conserve the external field. A constructive method is proposed for performing an integration in quadratures of the magnetic geodesic flows on homogeneous Riemannian manifolds of zero index. © 2014 Springer Science+Business Media New York.

Magazev A.A.,Omsk State Technical University
Theoretical and Mathematical Physics | Year: 2012

We investigate the structure of the Klein-Gordon-Fock equation symmetry algebra on pseudo-Riemannian manifolds with motions in the presence of an external electromagnetic field. We show that in the case of an invariant electromagnetic field tensor, this algebra is a one-dimensional central extension of the Lie algebra of the group of motions. Based on the coadjoint orbit method and harmonic analysis on Lie groups, we propose a method for integrating the Klein-Gordon-Fock equation in an external field on manifolds with simply transitive group actions. We consider a nontrivial example on the four-dimensional group E(2)×ℝ in detail. © 2012 Pleiades Publishing, Ltd.

Research And Production Society With Ltd Liability HF Communication and Omsk State Technical University | Date: 2012-10-10

The Invention concerns the antenna facilities and can be used as a small-sized aerial. Technical result is the essential reduction of overall dimensions of the aerial preserving the irradiation in ranges of radio-waves of LW, MW ans SW communication and, as consequence, the expansion of a functional use of the transceiving equipment. The dipole aerial contains the vibrator, the matching device, including induction. The vibrator is located in a magnetic field of the matching device made in the form of the transformer. The transformer is placed on the open core. The vibrator is electrically connected to the secondary winding of the transformer fig.2.

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