Элементы теории и методы параметрического регулирования эволюции национальной экономики на базе стохастических дискретных динамических моделей
Автор(ы): Ашимов А. А.*Ашимов Ас. А.*Боровский Ю. В.*(Новиков Д. А.*Серовайский С. Я.*Султанов Б. Т.*
Объем документа:
МРНТИ: 27.41.77
Ключевые слова: теория параметрического регулирования*дискретные стохастические динамические системы*стохастические вычислимые модели*
Реферат: Представлены результаты по развитию теории параметрического регулирования для класса дискретных стохастических динамических систем с аддитивным шумом. Показана эффективность применения теоретических результатов на примере стохастической вычислимой модели общего равновесия секторов экономики.
The Limiting Probabilities in the Process of Servicing
Автор(ы): Shakenova R.*
Объем документа: С. 184-186
МРНТИ: 28.29.07
Ключевые слова: теория массового обслуживания*марковский процесс*задачи обслуживания*
Реферат: Using z-transformation in Markov processes connected with the fact that the probabilities of transition for the n steps in them are geometric progressions, so that with the help of z-transformation expression for these probabilities can be obtained in analytical form.
Novel Macroporous Amphoteric Gels: Preparation and Characterization
Реферат: Macroporous amphoteric gels based on allylamine, methacrylic acid and acrylamide crosslinked by N,N-methylenebisacrylamide were synthesized by radical copolymerization of monomers in cryoconditions. The composition of cryogels was determined by combination of potentiometric and conductimetric titrations. The morphology of cryogels was evaluated by scanning electron microscope (SEM). Cryogels exhibited sponge-like porous structure with pore size ranging from 50 to 200 ?m. The values of the isoelectric points (IEPs) determined from the swelling experiments arranged between 3.5 and 4.3. The high adsorption-desorption capacity of amphoteric cryogels with respect to mM and trace concentrations of copper, nickel, and cobalt ions was demonstrated. It was shown that the macroporous amphoteric cryogels are able to adsorb up to 99.9% of copper, nickel, and cobalt ions from 10{-3} molL{-1} aqueous solution.
Solar Fuels Harvesting from Carbon Dioxide Conversions
Автор(ы): (Lei Yu.*(Nuraje N.*Yashkarova M.*Kudaibergenov S. E.*
Реферат: The review provides a comprehensive overview to the research progress of photocatalytic conversion of carbon dioxide reduction. Excessive anthropogenic activities increased carbon dioxide level in the atmosphere, which led the global warming. Meanwhile, the capability of producing carbonaceous fuels was linked to the issue of energy security. Therefore, the photocatalytic conversion by reducing carbon dioxide become crucial to solve both previous mentioned problems. Materials from inorganic semiconducting particles to organic molecule are explored in this field of research. The research progress updates in this review cover the techniques of changing morphology, coating with various cocatalysts, coupling with cavity space material, and synthesizing complex of organic molecule and inorganic photocatalysts. The theories of photocatalytic conversion related to kinetics and thermodynamics, and the measurement criteria of experimental performances are described.
Analysis of ill-posedness and numerical methods of solving a nonlinear inverse problem in pharmacokinetics for the two-compartmental model with extravascular drug administration
Автор(ы): Ilyin A. I.*(Kabanikhin S. I.*Nurseitov D. B.*Nurseitova A. T.*Asmanova N. A.*Voronov D. A.*Bakytov D.*
Реферат: A nonlinear inverse problem of pharmacokinetics for the dual-compartment model with extravascular route of the drug administration is considered. The problem is significantly ill-posed: its solution is not unique and is unstable. We discuss nonuniqueness of the inverse problem and the degree of ill-posedness. The initial problem is reduced to a linear operator equation by linearization. It is demonstrated that the resolving ability of the inverse problem can be improved by varying of the location of measurement data points. Results of numerical experiments are presented. The question of choosing the initial approximations is considered.
An optimization method in the Dirichlet problem for the wave equation
Автор(ы): (Kabanikhin S. I.*Bektemesov M. A.*Nurseitov D. B.*(Krivorotko O. I.*Alimova A. N.*
Объем документа: С. 193-211
МРНТИ: 27.41.19
Ключевые слова: задачи Дирихле*волновое уравнение*степень некорректности*метод итерации Ландвебера*метод сопряженных градиентов*
Реферат: A numerical method for solving the Dirichlet problem for the wave equation in the two-dimensional space is proposed. The problem is analyzed for ill-posedness and aregularization algorithm is constructed. The first stage in the regularization process consistsin the Fourier series expansion with respect to one of the variables and passing to afinite sequence of Dirichlet problems for the wave equation in the one-dimensional space.Each of the obtained Dirichlet problems for the wave equation in the one-dimensionalspace is reduced to the inverse problem Aq=f with respect to a certain direct (wellposed)problem. The degree of ill-posedness of the inverse problem is analyzed basedon the character of decreasing of the singular values of the operator A. The numerical solution of the inverse problem is reduced to minimizing the objective functional J(q)=(Aq-f, Aq-f). The results of numerical calculations are presented.
Analytical and experimental studies of pneumatic vibration exciter in inertia vibroabrasive machining of parts based on beryllium oxide
Автор(ы): Kurmangaliyev T. B.*Goltsev A. G.*Sikhimbayev M. R.*Sherov K. T.*Zharkevich O. M.*Sherov A. K.*
Реферат: In the article the results of studying a vibration exciter for vibration machining of the surface of the parts with a pneumatic vibratory drive, which showed its high efficiency when used in highly explosive and associated with fire risk productions, as well as for various technological processes of inertia machining parts based on beryllium oxide, are presented. As a result of the carried out analytical studies of an installation with a pneumatic vibratory drive, a mathematical model of vibration machining process dynamics was determined. The adequacy of the mathematical model of the compressed air flow effect on the roller in the pneumatic grinding set, as well as the roller mass effect on the oscillation amplitude was proved experimentally. The oscillation amplitude dependencies on pressure and the feeding nozzle diameter, when vibration process technology (vibration grinding, vibration polishing and others) of machining of parts is realized, are presented.
Evaluation of possible mechanical property improvement for alloy of the Al-Fe-Si-Mn system by equal-channel angular pressing
Автор(ы): Найзабеков А. Б.*Андреященко В. А.*
Объем документа: С. 159-163
МРНТИ: 53.43.01
Ключевые слова: сплав системы Al-Fe-Si-Mn*микроструктура сплава*механические свойства сплава*деформирование сплава*
Реферат: Data are provided for evaluation of possible improvement of mechanical properties for alloy of the Al-Fe-Si-Mn system. Alloy microstructure is simulated after deformation. Simulation results are confirmed by actual experimental data. Mechanical properties are also determined after alloy deformation.
Казахстанская система социального страхования и социального обеспечения
Автор(ы): Гельманова З. С.*Осик Ю. И.*
Объем документа:
МРНТИ: 06.73.65
Ключевые слова: система социального страхования*социальные риски*оплата больничных листов*социальные пособия*трудоустройство инвалидов*
Реферат: Рассмотрены вопросы социальной защиты работающих граждан РК при наступлении социальных рисков и особенности пенсионного обеспечения инвалидов в высокоразвитых странах Европы и в РК.
Экологическая политика АО Арселор Миттал Темиртау по снижению негативных воздействий металлургического комбината на окружающую среду
Реферат: Проведен анализ мероприятий, проводимых металлургическим комбинатом г. Темиртау, направленных на снижение негативных воздействий на окружающую среду. Описаны основные загрязнители, а также программы введения в действие очистных сооружений и системы экологического менеджмента.