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Bishkek, Kyrgyzstan

Omorov T.T.,National Academy of science of the Kyrgyz Republic | Asylbekov N.S.,Kyrgyz State Technical University
Optoelectronics, Instrumentation and Data Processing | Year: 2012

Approaches to determining the unknown operator and the diagram of the neural network in the process of its analysis for diagnostics of digital systems are considered. © 2012 Allerton Press, Inc. Source

Engelsht V.S.,Institute of Physical and Technical Problems and Material Science NAS KR | Muratalieva V.Z.,Kyrgyz State Technical University
Thermophysics and Aeromechanics | Year: 2014

Thermodynamic analysis (TERRA program) of synthesis, heating, and melting of stoichiometric glass CaSiO3·SiO2 has been carried out. Chemically pure substances silica and lime are subjected to exothermic reaction with further external heating and melting. Wollastonite is synthesized, the chemical reaction generates heat Qchr = −505.3 kJ/kg, and temperature increases T = 820 K. When Tmelt = 1812–1814 K, wollastonite melts, and a mixture of liquid wollastonite and condensed silica is formed. At Tmelt = 1995–1997 K, silica melts, and stoichiometric glass (CaSiO3·SiO2) is formed. Evolutions of temperature and melting of wollastonite and silica have been studied by detailed step-by-step thermodynamic calculation (ΔT = 0.1 K). © 2014, Pleiades Publishing, Ltd. Source

Zhainakov A.Z.,Kyrgyz State Technical University | Kurbanaliev A.Y.,Kyzyl Kiysk Humanitarian Pedagogic Institute of the Batken State University
Thermophysics and Aeromechanics | Year: 2013

The work presents the results of mathematical modeling of large-scale flows in areas with a complex topographic relief. The Reynolds-averaged Navier-Stokes equations constitute the basis of the three-dimensional unsteady modelling. The well-known Volume of Fluid method implemented in the solver interFoam of the open package OpenFOAM 1.7.1 is used to track the free-boundary location. The mathematical model adequacy is checked by comparing with experimental data. The efficiency of the applied technology is illustrated by the example of modeling the breakthrough of the dams of the Andijan (Uzbekistan) and Papan (near the Osh town, Kyrgyzstan) reservoirs. © 2013 Pleiades Publishing, Ltd. Source

Engel'Sht V.S.,National Academy of science | Muratalieva V.Zh.,Kyrgyz State Technical University
High Temperature | Year: 2013

A thermodynamic analysis of the interaction between limestone and silica is carried out under normal pressure with the use of the TERRA program system. An equilibrium system is considered. The thermodynamic parameters are calculated with a step-by-step increase in temperature. The temperature of calcium silicate synthesis with respect to the initial mixture composition is found. At all possible ratios between limestone and silica, the products of the chemical reaction are determined. The reaction heat, synthesis temperature, enthalpy increment, and heat content are determined. It is shown that wollastonite isothermal synthesis proceeds at 550 K at a constant heat content, and rankinite isothermal synthesis proceeds at 750 K at a constant heat content as well. The reaction heat increases with rising limestone content until rankinite starts to form and then decreases to zero. The interaction between limestone and silica produces carbon dioxide gas, whose content grows simultaneously with the rising reaction heat. When the rankinite yield is maximal, the amount of carbon dioxide diminishes to zero, because free limestone forms and CO2 is buried. On the basis of the results, the conclusion is drawn that the reaction proceeds with a latent exotherm due to latent limestone dissociation and formation of lime during the thermal interaction between limestone and silica. © 2013 Pleiades Publishing, Ltd. Source

Engel'Sht V.S.,Jeenbayev Institute Of Physical Technological Problems And Materials Science Chui Pr 265 | Muratalieva V.Z.,Kyrgyz State Technical University
High Temperature | Year: 2013

Thermodynamic analysis is performed (TERRA software) of the lime-silica interaction for all possible lime-to-silica ratios at normal pressure. The components of the exothermal reactions are calculated. The adiabatic temperature of silica combustion in the lime is found. The heat of the chemical reaction is determined. The enthalpies of the initial rough material and the combustion materials are calculated. The evolution of the silica combusting in the lime, including formation of the stochiometric glass, wollastonite, rankinite, and pseudo-cement, is considered. The thermodynamic analysis is performed under the supposition of use of chemically pure substances with the absence of external heat and specific additions. © 2013 Pleiades Publishing, Ltd. Source

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