Научная библиотека КарГУ им. Е.А.БукетоваThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.http://localhost:802019-08-21T13:22:46Z2019-08-21T13:22:46ZMathematical model of high-temperature melt flow with account for short-range order natureShaltakov, S.N.Kazhikenova, S.Sh.Nussupbekov, B.R.Karabekova, D.Zh.Khassenov, A.K.Stoev, M.http://rep.ksu.kz//handle/data/72832019-08-21T10:30:50Z2019-06-28T00:00:00ZMathematical model of high-temperature melt flow with account for short-range order nature
Shaltakov, S.N.; Kazhikenova, S.Sh.; Nussupbekov, B.R.; Karabekova, D.Zh.; Khassenov, A.K.; Stoev, M.
The problems of mathematical description of the viscous motion of the metal melt accompanied by overcoming the internal friction caused by the movement of particles and overcoming the forces of their interaction are investigated. Solutions of hydrodynamic equations involving quantum potentials of interparticle interaction of atoms in melts, and quantum effects were taken into account using correlation functions of transport coefficients such as viscosity, since they are quite closely related to the structure of matter and are the most structurally sensitive characteristics of matter. The research consists in the fact that the correlation functions of viscosity are justified from the point of view of the quantum statistical method. The correlation between correlation functions and radial distribution functions is established. A mathematical model of the flow of high-temperature melts taking into account the nature of the near order in them and the account of the second coefficient of viscosity by methods of statistical physics is described. On the basis of theoretical studies the parameters determining the relationship between viscosity and interatomic potential are calculated. The found dependences allow us to determine the average values of any physical parameters, in particular, the values of shear and volumetric viscosity.
2019-06-28T00:00:00ZThe study of multilayer coatings based on MoN(MoZr)ZrN and (TiMo)N/(TiMo), (CrZr)N/(CrZr) obtained by the method of vacuum-arc depositionSakenova, R.E.Erdybaeva, N.K.Pogrebnjak, A.D.Kylyshkanov, M.K.http://rep.ksu.kz//handle/data/72822019-08-21T10:24:56Z2019-06-28T00:00:00ZThe study of multilayer coatings based on MoN(MoZr)ZrN and (TiMo)N/(TiMo), (CrZr)N/(CrZr) obtained by the method of vacuum-arc deposition
Sakenova, R.E.; Erdybaeva, N.K.; Pogrebnjak, A.D.; Kylyshkanov, M.K.
In the article the results of experimental studies of multilayer coatings MoN(MoZr)ZrN and
(TiMo)N/(TiMo), (CrZr)N/(CrZr), obtained on A570 Grade stainless steel samples with a Ra roughness of up to 0.09 μm are presented. Coatings were formed by vacuum-arc evaporation of cathodes in the installation Bulat-6. After deposition of multilayer coatings by scanning electron microscopy and microanalysis, a nonuniform distribution of zirconium, chromium, nitrogen and molybdenum was found on the surface of the samples.The research results show that good tribological properties in combination with improved physicomechanical properties make the deposited material promising for use as a protective material for machines and tools operating in extremely difficult working conditions.
2019-06-28T00:00:00ZCurrent instability phenomena in a tunnel diode and electron self-organization processesChirkova, L.V.Ermaganbetov, K.T.Makhanov, K.M.Rozhkova, K.S.Arinova, E.T.Kurmash, A.http://rep.ksu.kz//handle/data/72812019-08-21T10:17:51Z2019-06-28T00:00:00ZCurrent instability phenomena in a tunnel diode and electron self-organization processes
Chirkova, L.V.; Ermaganbetov, K.T.; Makhanov, K.M.; Rozhkova, K.S.; Arinova, E.T.; Kurmash, A.
In the article the mechanisms of electric instability in semiconductors are considered. The origin of negative differential conductivity of different types are described. On the example of functioning of the tunnel diode the mechanism of formation of the concentrated instability in semiconductors resulting in N-shaped voltampere characteristic of the diode is considered. It is shown that the «semiconductor structure consisting of two layers of semiconductors with different type of conductivity and an external source of electric energy» system can be considered as an open non-equilibrium thermodynamic system in which self-organization processes are possible. Operation of the tunnel diode in terms of the theory of self-organization in semiconductor structures is analysed. Processes of self-organization are resulted by change of concentration of carriers of a charge in power zones of p- and n-semiconductors of types which make the tunnel diode and therefore the direction of streams of electrons changes. The description of the movement of carriers of a charge in the considered semiconductor structure at various values and external shift is given: in an equilibrium state, at the return shift; at the direct shift and tension which have values less peak value; and tension exceeding «voltage dip». In a thermodynamic non-equilibrium system there can be processes of self-organization of various nature — tunneling and injection of electrons. At the same time the direction of processes of self-organization is defined by features of power ranges of the semiconductors making the tunnel diode and intensity of interaction between system elements.
2019-06-28T00:00:00ZThe usage of the method of mathematical statistics in the process of optimization of the content of antifriction composite materialsZinchenko, D.A.Akimov, A.V.Babii, M.V.http://rep.ksu.kz//handle/data/72802019-08-21T09:27:29Z2019-06-28T00:00:00ZThe usage of the method of mathematical statistics in the process of optimization of the content of antifriction composite materials
Zinchenko, D.A.; Akimov, A.V.; Babii, M.V.
The optimum content of microtalc (dispersion d = 7...10 μm) and silver carbonate (dispersion d = 0,5 μm) fillers in polymeric materials was determined by the method of mathematical statistics to form an adhesive and functional layers of protective coatings. The mathematical models of physicomechanical and thermophysical characteristics of composites were obtained by the method of statistical processing of the results of the investigation materials.
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