Kazakh National Technical University

Almaty, Kazakhstan

Kazakh National Technical University named after Kanysh Satpayev is a leading technical university in Kazakhstan . Wikipedia.

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Baimenshina G.,Kazakh National Technical University
AIP Conference Proceedings | Year: 2015

The Lorenz-Haken system that is usually used as a model for the Helium-Neon Laser is considered. This system exhibits several types of bifurcations. The bifurcation scenarios have been studied using a mathematical package MATCONT. We have shown that the behavior of the system is sensitive to changes in parameters. We have identified several instances of Hopf and Pitchfork bifurcation at the operating point. The similar behavior is occurred when some parameters of the system are changed. The bifurcations in some cases have symmetrical nature. © 2015 AIP Publishing LLC.

Rakishev B.R.,Kazakh National Technical University
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences | Year: 2017

It was noticed, availability of the own mineral reserves is a guarantee of stable development of the economy, the industry, including smart-technologies and cyber-physical systems. Due to non-renewability and exhaustibility of these resources, the processes of their extraction and processing should be subject to the special requirements, which provide the integrated and full use of all the components contained in mineral raw materials. The place of Kazakhstan in the world by the reserves of various kinds of minerals and the role of mining and metallurgical complex (MMC) in the country economy are shown. The data on the minerals extraction and production over the past 5 years are provided. It is noted that in the deteriorating situation on the world metal markets there is an urgent need to diversify the MMC, providing increasing comprehensiveness and completeness of all the useful components contained in mineral raw materials and the mastering of the subsequent repartition. Also a strong demand for noble, rare and rare-earth metals for the needs of high-tech and knowledge-intensive branches of industries is taken into account. The urgency of the scientific work acceleration is based, aimed at the development and introduction of new technologies, processes and technical tools, providing a more complete extraction in a marketable product of all the components contained in the ore. It is proved that such results can be achieved with the full conformity of the technology of ore processing to its natural properties and technological characteristics. It is shown that all technologies of geological-prospecting, mining, mineral processing and chemical-metallurgical industries, providing increasing comprehensiveness of the mineral useful components extraction, consist in increase their numbers, enhancing the values of the coefficients of their extraction in the concentrate, metal. These solutions are the technological resources to increase the quality and completeness of the use of mineral raw material. It is illustrated by specific examples. It is calculated that the total revenue from the sale of related noble and rare metals exceeds the income from core metals (copper, molybdenum) in 9.33. It was noticed, introduction of scientific developments of the scientists-geologists, miners and metallurgists of Kazakhstan-by the full and integrated use of mineral raw material (including oil, uranium, coal) into practice will significantly improve the efficiency of the natural resources sector and the economy as a whole. At the same time it makes an invaluable contribution to the development of high-tech industries and provide srapid joining of Kazakhstan to the number of the 30 most developed countries of the world. © National Academy of Sciences of the Republic of Kazakhstan, 2017.

Nurmagambetov A.,Kazakh National Technical University
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences | Year: 2017

The article is devoted to the use of palaeoseismological data in assessment of the seismic hazard in Kazakhstan. The main group of data on earthquakes, used in the preparation of maps of seismic zoning. It is particularly emphasized the importance of palaeoseismological data that complement the historical and current data on seismicity by identifying, describing and dating palaeoearthquakes large. It noted the low level of development palaeoseismological studies in Kazakhstan and offered the main directions of research. © National Academy of Sciences of the Republic of Kazakhstan, 2017.

Khairullin E.,Kazakh National Technical University
AIP Conference Proceedings | Year: 2016

In this paper we consider a special boundary value problem for multidimensional parabolic integro-differential equation with boundary conditions that contains as a boundary condition containing derivatives of order higher than the order of the equation. The solution is sought in the form of a thermal potential of a double layer. Shows lemma of finding the limits of the derivatives of the unknown function in the neighborhood of the hyperplane. Using the boundary condition and lemma obtained integral-differential equation (IDE) of parabolic operators, whCrossed D signţre an unknown function under the integral contains higher-order space variables derivatives. IDE is reduced to a singular integral equation (SIE), when an unknown function in the spatial variables satisfies the Holder. The characteristic part is solved in the class of distribution function using method of transformation of Fourier-Laplace. Found an algebraic condition for the transition to the classical generalized solution. Integral equation of the resolvent for the characteristic part of SIE is obtained. Integro-differential equation is reduced to the Volterra-Fredholm type integral equation of the second kind by method of regularization. It is shown that the solution of SIE is a solution of IDE. Obtain a theorem on the solvability of the boundary value problem of multidimensional parabolic integro-differential equation, when a known function of the spatial variables belongs to the Holder class and satisfies the solvability conditions. © 2016 Author(s).

Aidarova S.,Kazakh National Technical University | Sharipova A.,Kazakh National Technical University | Sharipova A.,Max Planck Institute of Colloids and Interfaces | Kragel J.,Max Planck Institute of Colloids and Interfaces | Miller R.,Max Planck Institute of Colloids and Interfaces
Advances in Colloid and Interface Science | Year: 2014

Stabilization of emulsions by mixed polyelectrolyte/surfactant systems is a prominent example for the application in modern technologies. The formation of complexes between the polymers and the surfactants depends on the type of surfactant (ionic, non-ionic) and the mixing ratio. The surface activity (hydrophilic-lipophilic balance) of the resulting complexes is an important quantity for its efficiency in stabilizing emulsions. The interfacial adsorption properties observed at liquid/oil interfaces are more or less equivalent to those observed at the aqueous solution/air interface, however, the corresponding interfacial dilational and shear rheology parameters differ quite significantly. The interfacial properties are directly linked to bulk properties, which support the picture for the complex formation of polyelectrolyte/surfactant mixtures, which is the result of electrostatic and hydrophobic interactions. For long alkyl chain surfactants the interfacial behavior is strongly influenced by hydrophobic interactions while the complex formation with short chain surfactants is mainly governed by electrostatic interactions. © 2013 Elsevier B.V.

Kudaibergenov S.E.,Kazakh National Technical University | Kudaibergenov S.E.,Institute of Polymer Materials and Technology | Nuraje N.,Massachusetts Institute of Technology | Khutoryanskiy V.V.,University of Reading
Soft Matter | Year: 2012

This review describes the state-of the-art of nano-, micro- and macrogels, membranes, micro- and nanocapsules, as well as multilayered thin films exhibiting amphoteric character. The synthetic strategies and physicochemical properties of amphoteric materials are outlined in light of the stimuli-responsive behavior and their potential application in nanotechnology, biotechnology and medicine. This journal is © 2012 The Royal Society of Chemistry.

Baimenshina G.,Kazakh National Technical University
Journal of Physics: Conference Series | Year: 2015

In this paper the dynamics of a two-mode semiconductor laser model is considered. The dynamic evolution of a two -mode semiconductor laser can be described by nonlinear rate equations, which take in account the gain saturation. Changes in parameters of the system can lead to changes of the character of the solutions. Qualitative analysis of the system is used for investigating the typical bifurcations and allowed conditions for the existence of different types of mode oscillations in the system. The phase portraits of steady state solution of system are plotted using numerical methods. The competition phenomenon between modes is observed. © Published under licence by IOP Publishing Ltd.

Kudaikulova G.,Kazakh National Technical University
Journal of Physics: Conference Series | Year: 2015

Therheological properties of drilling muds were studied. It is shown that for receiving pseudo-plastic liquids with an indicator of nonlinearity of N<0.3 use of polymers with a high molecular weight or a combination of polymers to various influence on water structure is most expedient. © Published under licence by IOP Publishing Ltd.

Algazy Z.,Kazakh National Technical University
Vibroengineering Procedia | Year: 2015

In this paper is studied a vibratory conveyor that is placed on an elastic base. Using the closed contours method it was determined the system that needs to be solved to obtain graphical representation for the generalized coordinates determining the position of the mechanical system elements. The shaking conveyor represents the chase hanged or supported to the fixed section. The chase commits oscillating motions hereupon the cargo which is in the chase, migrates concerning to the chase. The nature of the flow and its parameters are determined by the nature of the oscillating committed by the chase. Justifying the dynamic parameters of the shaking conveyor and a study of the stress-strain state. Installation causes fluctuations fixed tray. Uniformly distributed load on the tray acts in each element of the mechanism. A proper dynamic model has been developed within MSC ADAMS software. Simulation tests have been carried out and results are discussed to validate the proposed design solution. © JVE International Ltd.

Ivanov K.S.,Kazakh National Technical University
WCE 2010 - World Congress on Engineering 2010 | Year: 2010

It is proved: kinematic chain with two degrees of freedom containing the closed loop and only one input link is definable. The proof is carried out on basis of statics lows. The closed loop imposes additional constraint on the kinematic chain and transforms it in mechanism with one input. Such mechanism has the property of force adaptation to variable technological loading. Gear adaptive transfer in form closed gear differential contains input carrier, closed loop and output carrier. At constant input power the output carrier possesses an angular speed which inverse to a torque. Such gear adaptive transfer has constant engagement of tooth wheels and provides variable transfer ratio (as variator) without any control. Laws of interrelation of force and kinematic parameters are resulted. Assembly drawing of adaptive gear transfer is presented. The developed transfer permits creation of adaptive transfer boxes of cars, drilling rigs, manipulators, rudder air scoops and others.

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