Al-Farabi Kazakh National University

www.kaznu.kz/
Almaty, Kazakhstan

Al-Farabi Kazakh National University , also called KazGU or KazNU, is a university in Almaty, Kazakhstan. Named after the Muslim scholar al-Farabi, it is the country's primary and largest university.KazNU is the oldest classical university of the Republic established by the Decree of the Kazakh Regional Committee office dated November 13, 1933. One year after Kazakhstan's 1990 declaration of independence, the name was changed to Al-Farabi Kazakh State University. In 2001, the government classified it as a "national" university. More than 20000 students, graduates and PhD students study at KazNU, and there are more than 2500 faculty members working at KazNU, including 400 doctors of science, professors and more than 800 candidates of science and associate professors. Like other universities founded under the Soviet system, it is highly centralized. Wikipedia.

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Takibayev N.,Al-Farabi Kazakh National University
Few-Body Systems | Year: 2017

Neutron resonances in systems of few nuclei, electron capture reactions with formation of excited nuclei, and density oscillation in the neutron star envelopes are investigated. These results allow to propose the special experiments to verify the neutron resonances in the few-body systems and understand the origin of some processes that are going in the neutron star crusts. © 2017, Springer-Verlag Wien.


Baitureyeva A.,Al-Farabi Kazakh National University
AIP Conference Proceedings | Year: 2017

The active development of the industry leads to an increase in the number of factories, plants, thermal power plants, nuclear power plants, thereby increasing the amount of emissions into the atmosphere. Harmful chemicals are deposited on the soil surface, remain in the atmosphere, which leads to a variety of environmental problems which are harmful for human health and the environment, flora and fauna. Considering the above problems, it is very important to control the emissions to keep them at an acceptable level for the environment. In order to do that it is necessary to investigate the spread of harmful emissions. The best way to assess it is the creating numerical simulation of gaseous substances' motion. In the present work the numerical simulation of the spreading of emissions from the thermal power plant chimney is considered. The model takes into account the physical properties of the emitted substances and allows to calculate the distribution of the mass fractions, depending on the wind velocity and composition of emissions. The numerical results were performed using the ANSYS Fluent software package. As a result, the results of numerical simulations and the graphs are given. © 2017 Author(s).


Issakhov A.,Al-Farabi Kazakh National University
AIP Conference Proceedings | Year: 2017

The paper presents a numerical modelling of the thermal load on the aquatic environment by using two water discharge pipes of the thermal power plant. It is solved by the Navier-Stokes and temperature transport equations for an incompressible fluid in a stratified medium. The numerical solution of the equation system is divided into four stages by using projection method which was approximated by the finite volume method. At the first step it is assumed that the momentum transfer was carried out only by convection and diffusion. Intermediate velocity field is solved by 5-step Runge-Kutta method. At the second stage, the pressure field is solved by found the intermediate velocity field. Poisson equation for the pressure field is solved by Jacobi method. The third step is assumed that the transfer is carried out only by pressure gradient. The fourth step of the temperature transport equation is also solved as momentum equations. The obtained numerical results of stratified turbulent flow for two water discharged pipes were compared with experimental data and with numerical results for one water discharged pipe. General thermal load in the reservoir-cooler decreases comparing one water discharged pipe and revealed qualitatively and quantitatively approximately the basic laws of hydrothermal processes occurring in the reservoir-cooler can be seen that from numerical simulations where two water discharged pipes were used. © 2017 Author(s).


Kamzanova A.T.,Al-Farabi Kazakh National University | Kustubayeva A.M.,Al-Farabi Kazakh National University | Matthews G.,University of Central Florida
Human Factors | Year: 2014

Objective: A study was run to test which of five electroencephalographic (EEG) indices was most diagnostic of loss of vigilance at two levels of workload. Background: EEG indices of alertness include conventional spectral power measures as well as indices combining measures from multiple frequency bands, such as the Task Load Index (TLI) and the Engagement Index (EI). However, it is unclear which indices are optimal for early detection of loss of vigilance. Method: Ninety-two participants were assigned to one of two experimental conditions, cued (lower workload) and uncued (higher workload), and then performed a 40-min visual vigilance task. Performance on this task is believed to be limited by attentional resource availability. EEG was recorded continuously. Performance, subjective state, and workload were also assessed. Results: The task showed a vigilance decrement in performance; cuing improved performance and reduced subjective workload. Lower-frequency alpha (8 to 10.9 Hz) and TLI were most sensitive to the task parameters. The magnitude of temporal change was larger for lowerfrequency alpha. Surprisingly, higher TLI was associated with superior performance. Frontal theta and EI were influenced by task workload only in the final period of work. Correlational data also suggested that the indices are distinct from one another. Conclusions: Lower-frequency alpha appears to be the optimal index for monitoring vigilance on the task used here, but further work is needed to test how diagnosticity of EEG indices varies with task demands. Application: Lower-frequency alpha may be used to diagnose loss of operator alertness on tasks requiring vigilance. Copyright © 2014, Human Factors and Ergonomics Society.


Issakhov A.,Al-Farabi Kazakh National University
AIP Conference Proceedings | Year: 2012

This paper presents the mathematical model of the thermal power plant influence in the aquatic environment, which is solved by the Navier - Stokes and temperature equations for an incompressible fluid in a stratified medium. Numerical algorithm based on the method of splitting by physical parameters with combination of Fourier method for Poisson equation. © 2012 American Institute of Physics.


Issakhov A.,Al-Farabi Kazakh National University
Scientific World Journal | Year: 2014

This paper presents the mathematical model of the thermal process from thermal power plant to aquatic environment of the reservoir-cooler, which is located in the Pavlodar region, 17 Km to the north-east of Ekibastuz town. The thermal process in reservoir-cooler with different hydrometeorological conditions is considered, which is solved by three-dimensional Navier-Stokes equations and temperature equation for an incompressible flow in a stratified medium. A numerical method based on the projection method, divides the problem into three stages. At the first stage, it is assumed that the transfer of momentum occurs only by convection and diffusion. Intermediate velocity field is solved by fractional steps method. At the second stage, three-dimensional Poisson equation is solved by the Fourier method in combination with tridiagonal matrix method (Thomas algorithm). Finally, at the third stage, it is expected that the transfer is only due to the pressure gradient. Numerical method determines the basic laws of the hydrothermal processes that qualitatively and quantitatively are approximated depending on different hydrometeorological conditions. © 2014 Alibek Issakhov.


Issakhov A.,Al-Farabi Kazakh National University
International Journal of Nonlinear Sciences and Numerical Simulation | Year: 2014

Zonal RANS/LES modelings have received considerable attention over recent years. Especially with the attached boundary layers that computed using the Reynolds- averaged Navier - Stokes (RANS) equations, and non-equilibrium zones of the flow by large-eddy simulation (LES). Generation eddies from a smooth RANS field of turbulent eddies capable of supporting the Reynolds stresses in the LES zones are one issue that may affect the accuracy of the results of zonal methods. Synthetic turbulence and controlled forcing are used to generate turbulence structures in the LES zones.


This paper presents the mathematical model of the thermal power plant in cooling pond under different meteorological conditions, which is solved by three dimensional Navier-Stokes equations and temperature equation for an incompressible fluid in a stratified medium. A numerical method based on the projection method, which divides the problem into three stages. At the first stage it is assumed that the transfer of momentum occurs only by convection and diffusion. Intermediate velocity field is solved by method of fractional steps. At the second stage, three-dimensional Poisson equation is solved by the Fourier method in combination with tridiagonal matrix method (Thomas algorithm). At the third stage it is expected that the transfer is only due to the pressure gradient. The compact scheme was used to increase the order of approximation. Then the basic laws of the hydrothermal processes depending on different hydrometeorological conditions were determined qualitatively and quantitatively approximate. © 2013 Springer International Publishing Switzerland.


Issakhov A.,Al-Farabi Kazakh National University
Journal of Physics: Conference Series | Year: 2011

Parallel implementation of algorithm of numerical solution of Navier-Stokes equations for large eddy simulation (LES) of turbulence is presented in this research. The dynamic Smagorinsky model is applied for sub-grid simulation of turbulence. The numerical algorithm was worked out using a scheme of splitting on physical parameters. At the first stage it is supposed that carrying over of movement amount takes place only due to convection and diffusion. Intermediate field of velocity is determined by method of fractional steps by using Thomas algorithm (tridiagonal matrix algorithm). At the second stage the determined intermediate field of velocity is used for determination of the field of pressure. Three dimensional Poisson equation for the field of pressure is solved using over relaxation method.


Mazhitova A.D.,Al-Farabi Kazakh National University
Journal of Dynamical and Control Systems | Year: 2012

In this paper we study geodesics of a left-invariant sub-Riemannian metric on a three-dimensional solvable Lie group. A system of differential equations for geodesics is derived from Pontryagin maximum principle and by using Hamiltonian structure. In a generic case the normal geodesics are described by elliptic functions, and their qualitative behavior is quite complicated. © 2012 Springer Science+Business Media, Inc.

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