Электронный каталог

22.2
L10
Kydyrbekuly, A. B
    About the separation of finely divided particles during centrifugation inliquid media [Текст] / A.B Kydyrbekuly // Әл - Фараби ат. ҚҰУ Хабаршы = Вестник КазНУ им Аль - Фараби. - Алматы, 2018. - №2(98). - С. 33-44. - (Математика, механика, информатика сериясы=Серия математика, механика, информатика. Journal of Mathematics, Mechanics, Computer Science.)
ББК 22.2

Рубрики: Механика

Кл.слова (ненормированные):
separation -- settling -- centrifuge -- multiphase fluid -- rotor system -- demetallization of oil
Аннотация: This work is devoted to the study of centrifugation processes, which are one of the most complexprocesses of technology. The use of the action of the centrifugal force field for the separationof heterogeneous liquid systems in a rotor system (centrifuge) is very effective. Separability ofcentrifuged materials, multiphase dispersion, the relationship between phases cause ambiguousprocesses of centrifugation, and therefore it is not always possible to accurately predict and evaluatethe main characteristics of the separation of heterogeneous systems in the centrifugal force field.For a qualitative assessment of the main separation characteristics, such as the angular velocityof rotation, the dependence of the angles of inclination of the glasses on the angular velocity, thesettling time of particles, etc., is created a mathematical model of the vertical rotor system. Therotor represents a round disk on which cups (vial) with a multiphase liquid are symmetricallysuspended. A particular case of a fixed rotor is considered. Nonlinear differential equations ofmotion of the suspension particle, which have no exact solution, are obtained. The research isconducted by analytical and numerical methods. The dependence of the slope angles of the tubesfrom the angular rotational speed of the rotor, sedimentation curves are obtained , which allowestimating the time of particle deposition and the effect of the particle size distribution on theseparation process. The results of this research work allow us to determine with sufficient accuracyall the necessary characteristics of the sedimentation working process, and also, in certain cases,it is possible to exclude the conduct of experimental work. The results of the work confirm thephysical meaning of the process, which can serve as a justification for the use and introduction ofthis mathematical model in industrial production.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Rahmetolla, A.Sh
Ibraev, G.E

24
Z19
Zakarina, N.A.
    Influence of space velocity and temperature on the isomerizing activity of zeolite-containing pd- catalysts deposited on the pillared tagan montmorillonite [Текст] / N.A. Zakarina, O. Dоlelkhanuly, N.A. Kornaukhova // Известия национальной академии наук Республики Казахстан. - 2018. - №4. - С. 64-70. - (Серия Химии и технологии)
ББК 24

Рубрики: Химические наук

Кл.слова (ненормированные):
н-гексан -- изомеризация -- объемная скорость -- температура -- селективность -- дизамещенные изомеры -- октановое число
Аннотация: В статье представлены данные об изомеризации н-гексана на бесцеолитных и морденитсодержащих Pd-катализаторах, нанесенных на активированный и пилларированный Al-Zr монтмориллонит в Ca-форме. Элементарный анализ композитов показал, что содержание щелочных металлов в монтмориллонитах уменьшается в процессе активации и пилларирования по сравнению с исходным образцом глины. Например, содержание натрия в Pd / AlZr CaHMM + HM-катализаторе не превышает 0,08%. После пилларирования среднее содержание Zr на этом катализаторе составляет 9,34 мас.%. Было показано, что введение морденита способствует увеличению конверсии н-гексана в 1,5-3,5 раза и значительному увеличению количества дизамещенных изогексанов. Определена оптимальная объемная скорость подачи н-гексана (0,64 ч-1), при которой изученный Pd-катализатор показывает максимальную изомеризующую активность с образованием 44,7% моно- и дизамещенных изогексанов и 4,4% изогептанов. Оптимальная температура изомеризации н-гексана на Pd-катализаторе составляет 3500 С. Увеличение октанового числа на этом катализаторе при 350-400°С составляет 45,4 - 45,6 единиц. Выявлена корреляция между изомеризующей активностью и числом средних и сильных кислотных центров.
Держатели документа:
ЗКГУ
Доп.точки доступа:
Dоlelkhanuly, O.
Kornaukhova, N.A.

24
K70
Koleskin, V. N.
    The modeling of a flow in flat and radial contast units with a still granular layer. The solving of the problem in II domain [Текст] / V. N. Koleskin, A. A. Yunusov [et al.] // News of the National Academy of sciences of the Republic of Kazakhstan. - 2020. - №4. - Р. 135-143
ББК 24

Рубрики: Chemistry

Кл.слова (ненормированные):
chemical reactor -- still granular layer -- catalyst -- ergun law -- velocity filed -- layer resistnce
Аннотация: Heterogeneous catalytic processes conducted in axial or radial type reactors with a still catalytic layer are some of the most important elements of the chemical technology.
Держатели документа:
WKU
Доп.точки доступа:
Yunusov , A.A.
Yunusova, A.A.
Shtern, P.G.
Lukyanova , A.V.
Amandikov, M.A.
Zhumadullayev, D.K.

39.5
S28
Sayakov, O.
    3D aerodynamic analysis of awing with 2- way fluid-structure interaction. [Текст] / O. Sayakov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №4. - P. 129-134
ББК 39.5

Рубрики: Воздушный транспорт

Кл.слова (ненормированные):
NACA 23012 airfoil -- Fluid-Structure Interaction -- ANSYS -- strongly coupling study -- deformation of the wing
Аннотация: the aircraft wings facing different weather conditions start to deform and oscillate with an unpredictable velocity and amplitude. Most of the previous studies were conducted assuming the wing as a rigid body.However, the wing analysis with Fluid-Structure Interaction(FSI)has significant effectson the results. This paper compares the strongly coupled 2-way FSI analysisof the flexible wing with a geometry of NACA 23012and a rigid body 2D winganalysis. Both studies were carried out at a Mach number of 0.075 and Reynolds number of 0.6×106for different angles of attack.Moreover, the analysis of the wing deformation at the start of the flight is also presented. Finally, it was shownthat FSI analysis gives closer results to the experimental measurements, proving the worthiness of the extra efforts of the two-way FSI analysis
Держатели документа:
WKU
Доп.точки доступа:
Zhao, Y.
Mashekova, A.

22.1
I-32
Ibrayev, A. T.
    Construction and application of a dynamic motion counting system for researching the properties of electron mirrors and cathode lenses. [Текст] / A. T. Ibrayev // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №6. - P. 114-120
ББК 22.1

Рубрики: Mathematica

Кл.слова (ненормированные):
motion -- reference frame -- coordinate transformation -- velocity -- interval invariance
Аннотация: Based on the analysis and consideration of the features of Galileo’s transformations, new inertial and dynamic reference frames of movements are obtained. In the new inertial reference frame, the main drawback of Galileo’s transformations, associated with the violation of the invariance of the intervals between events, is eliminated. The developed dynamic frame of reference makes it possible to conduct effective studies of movements in force fields. Elements of this dynamic frame of reference intuitively, without a detailed analysis of the meaning of the transformations used, have been successfully applied in a number of scientific works in the field of physical electronics, devoted to the construction of theories of electron mirrors and cathode lenses. Obviously, the new reference systems indicated in the work will find wide application both in the field of research and design of electron-optical devices and ion-beam technological installations, and in other branches of fundamental and technical sciences.
Держатели документа:
WKU

24
K70
Koleskin, V. N.
    The solving of the problem in the working zone. The numerical calculation of the model of the nizhnekamsk reactor for the styene production (Part -3). [Текст] / V. N. Koleskin // News of the national academy of sciences of the Kazakhstan. . - 2021. - №1. - P. 6-13
ББК 24

Рубрики: chemistry

Кл.слова (ненормированные):
chemical reactor -- still granular layer -- catalyst -- ergun law -- stream function -- granular layer resistance factor -- Green's function pressure field -- velocity field -- layer resistance
Аннотация: The article deals with a mathematical modeling of an incompressible liquidflow in flat and radial contact units with the still granular layer and a creation on numerical realzation methods for the model.
Держатели документа:
WKU
Доп.точки доступа:
Yunusov, A.A.
Yunusova, A.A.
Shtern, P.G.
Lukyanova, A.V.
Zhmadullayev, D.K.
Ainamkulova, T.S.
Bugibaev, E.T.

24
Z63
Zhumabek, M.
    Ni-Al-Mg-Mn composite catalysts for partial oxidation of natural gas. [Текст] / M. Zhumabek, G. N. Kaumenova, A. Manabayeva, R. O. Sarsenova, S. O. Kotov // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №4. - P. 19-26
ББК 24

Рубрики: chemistry

Кл.слова (ненормированные):
catalytic oxidation -- methane -- synthesis-gas -- nickel -- magnesium
Аннотация: the problem of rational utilization of natural and associated petroleum gases and the cessation of their flaring is one of the acute and unresolved environmental problems. The aim of this work is to develop effective thermally stable catalysts ofa new generation for the processes of oxidative conversion of light alkanes of natural and associated gas into synthesis gas. The results of partial oxidation of the methane of natural gas on the catalysts prepared by solution combustion synthesis are presented. Investigation of the activity of catalysts produced from initial mixture of Ni(NO3)2-Al(NO3)3-Mg(NO3)2-Mn(NO3)2+ urea of different composition was carried out for the production of synthesis-gas. It was found that the optimal conditions for producing of synthesis-gas are: CH4conversion higher than 95%, yield of target products: Н2-97 -99% and СО -40 -43%, Т = 900оС, space velocity –2500 and 6500 h-1. The catalysts were studied by X-ray diffraction, transmission electron microscopy, specific surface area, pore volume and average pore diameter. The presence in the catalysts of simple and mixed oxides, metal aluminates and spinel-type structures, the presence of which contributes to the active work of catalysts for oxidativeconversion of CH4, has been established.
Держатели документа:
WKU
Доп.точки доступа:
Kaumenova, G.N.
Manabayeva, A.
Sarsenova, R.O.
Kotov, S.O.