Bulletin of the University of Karaganda-Physics最新文献_第6页

Influence of vacuum on diffusion of moisture inside seeds of cereals 真空对谷物种子内部水分扩散的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/90-98

V. Shvidia, S. Stepanenko, B. Kotov, A. Spirin, V. Kucheruk

{"title":"Influence of vacuum on diffusion of moisture inside seeds of cereals","authors":"V. Shvidia, S. Stepanenko, B. Kotov, A. Spirin, V. Kucheruk","doi":"10.31489/2022ph3/90-98","DOIUrl":"https://doi.org/10.31489/2022ph3/90-98","url":null,"abstract":"The article solves the problem of thermal injury of seeds of grain crops during drying, which are capillaryporous bodies. It is hypothesized that the use of a vacuum in the drying chamber reduces the risk of thermal stress. In this regard, the article studies the effect of a vacuum inside the drying chamber on the diffusion of moisture inside the seeds. Seeds are complex materials in which moisture has different bonds with dry matter. During the working process, the drying speed in the surface layers and inside the seeds occurs at different speeds. As a result, drying stresses occur, which cause cracks on the surface of the seeds. Based on the solution to the differential diffusion equation with an absorbing screen as a boundary condition, the condition for drying without thermal stresses is found. Experimental verification of theoretical studies is carried out on a specially made experimental setup on the example of corn seeds. The effect of thermal stress on seed viability is determined by laboratory germination. Experimental studies confirm the adequacy of theoretical statements. Thus, when drying the seeds of grain crops, which are capillary-porous bodies, there is a limit value of rarefaction, above which cracks appear on the surface of the seeds due to different drying rates on the surface and inside. For drying seeds of grain crops without thermal stresses, it is necessary to consider not only the heating temperature but also the rarefaction in the drying chamber, which should be close to the limit value.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49544944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of velocity and pressure vector distribution fields in a three-dimensional plane around a wind power plant 风力发电厂周围三维平面速度和压力矢量分布场分析

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/108-114

A. Bakhtybekova, N. Tanasheva, N. Shuyushbayeva, L. Minkov, N. Botpaev

{"title":"Analysis of velocity and pressure vector distribution fields in a three-dimensional plane around a wind power plant","authors":"A. Bakhtybekova, N. Tanasheva, N. Shuyushbayeva, L. Minkov, N. Botpaev","doi":"10.31489/2022ph3/108-114","DOIUrl":"https://doi.org/10.31489/2022ph3/108-114","url":null,"abstract":"To date, there has been an increase in demand for electric energy obtained from clean renewable energy sources. One of them is wind power. Based on this, the development and research of new types of efficient wind turbines that start working at low wind speeds is an urgent issue. Wind turbines operating based on the Magnus effect have proven their effectiveness. However, the authors of this work, for the first time, to eliminate the problem in the form of an electric drive for the promotion of cylindrical blades added a deflector element to the end of the cylinders. Before creating an experimental setup, it is necessary to numerically investigate the aerodynamics around the wind wheel. For this purpose, numerical simulation of wind wheel aerodynamics has been carried out using the highly efficient Ansys Fluent program. A three-dimensional geometry has been created in Design Modeler. A mathematical model grid with a grid number of 47329 consisting of tetragonal cells is constructed. The Realizable k-ε is chosen as the turbulence model. A thorough analysis of the velocity vector distribution fields for flow and pressure velocities in the three-dimensional plane around the wind wheel at air flow velocities of 5.10 and 15 m/s is carried out.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45677761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of synthesis duration on heat and charge transport in polycrystalline CuCr1-xMgxO2 合成时间对CuCr1-xMgxO2多晶热电荷输运的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/6-11

V. Kulbachinskii, V. Kytin, I. Korsakov, Zh. T. Ismailov

引用次数: 0

On nonclassical boundary conditions for the contact of thin interlayers with different physical and mechanical properties on wave propagation in anisotropic media 各向异性介质中不同物理力学性质薄夹层接触的非经典边界条件

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/68-79

N. Ispulov, A. Qadir, A. Zhumabekov, A. A. Kurmanov, K.R. Dosumbekov

{"title":"On nonclassical boundary conditions for the contact of thin interlayers with different physical and mechanical properties on wave propagation in anisotropic media","authors":"N. Ispulov, A. Qadir, A. Zhumabekov, A. A. Kurmanov, K.R. Dosumbekov","doi":"10.31489/2022ph3/68-79","DOIUrl":"https://doi.org/10.31489/2022ph3/68-79","url":null,"abstract":"Wave processes are intensively studied in various fields of physics: electrodynamics, plasma physics, radiophysics, acoustics, hydrodynamics, etc. Along with the study of electromagnetic and elastic wave processes, the research of patterns of wave propagation of various physical nature in the presence of mutual transformation are of particular relevance. Wave processes in coupled fields reflect the mutual influence of elastic, electromagnetic and thermal fields. The coupling of electromagnetic fields to the deformation field takes place in a medium with piezoelectric, piezomagnetic and magnetostrictive properties. In the paper, based on the matrix method, the propagation of coupled elastic and electromagnetic waves in media with different physical and mechanical properties is studied. The paper proposes a generalization of non-classical contact conditions for studying the effect of thin layers with different physical and mechanical properties on wave processes. A system of differential equations of the 1st order with variable coefficients is constructed, which describe the propagation of electroelastic waves in anisotropic media of a rhombic system of class 222. The conditions for nonrigid contact for a thin layer with piezoelectric properties are derived. The possibility of studying layers with δ-shaped properties (δ is the Dirac function) is proved.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47042274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of electrochemical characteristics of NiCo2O4 and NiCo2S4 nanostructures for supercapacitors 超级电容器用NiCo2O4和NiCo2S4纳米结构的电化学特性比较

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/36-42

А.А. Markhabayeva, M.B. Baidilda, Shyryn Nurbolat, Zh. K. Kalkozova, R. Nemkayeva, K. Abdullin

{"title":"Comparison of electrochemical characteristics of NiCo2O4 and NiCo2S4 nanostructures for supercapacitors","authors":"А.А. Markhabayeva, M.B. Baidilda, Shyryn Nurbolat, Zh. K. Kalkozova, R. Nemkayeva, K. Abdullin","doi":"10.31489/2022ph3/36-42","DOIUrl":"https://doi.org/10.31489/2022ph3/36-42","url":null,"abstract":"This paper presents the results on the synthesis and study of the properties of NiCo2O4 and NiCo2S4 nanostructures obtained by hydrothermal synthesis for their use as supercapacitor electrodes. A method is developed for growing a nanostructure from a ternary metal oxide NiCo2O4 on a nickel substrate. The structural features of the synthesized NiCo2O4 and NiCo2S4 nanostructures are studied using X-ray phase analysis. The obtained samples have a cubic modification NiCo2O4 and NiCo2S4 . The data on the morphology of the synthesized samples obtained by scanning electron microscopy are presented. The samples are in the form of nanoneedles and nanowires grown on a nickel substrate. Methods for the synthesis of NiCo2O4 nanostructures have been studied, optimal conditions for the growth of nanostructures from NiCo2O4 have been determined, and a NiCo2O4 sulfurization method has been developed to obtain a NiCo2O4 nanostructure. Comparative studies have been carried out on the effects of sulfurization on the electrochemical characteristics of the obtained electrodes. It is found that, despite the fact that NiCo2O4 oxide nanostructures have a high theoretical capacitance, the replacement of oxygen atoms by sulfur atoms increases the conductivity of the materials and leads to a further increase in the specific capacitance of the end electrodes. The maximum Cs obtained specific capacitance for NiCo2S4 is 1976 F g-1 and while for NiCo2O4 it is 413 F g-1 at a scan rate of 5 mV/s. The results of the dependence of the specific capacitance on the scanning speed during measurements are also presented.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42238136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of tribological properties of detonation carbosilicide coatings with subsequent pulsed-plasma treatment 后续脉冲等离子体处理对爆轰硅化碳涂层摩擦学性能的改善

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/61-67

Zhuldyz Sagdoldina, B. Rakhadilov, D. Buitkenov, L. Zhurerova, A. Kenesbekov

{"title":"Improvement of tribological properties of detonation carbosilicide coatings with subsequent pulsed-plasma treatment","authors":"Zhuldyz Sagdoldina, B. Rakhadilov, D. Buitkenov, L. Zhurerova, A. Kenesbekov","doi":"10.31489/2022ph3/61-67","DOIUrl":"https://doi.org/10.31489/2022ph3/61-67","url":null,"abstract":"This work considers the results of research of mechanical and tribological properties of surface layer of Ti3SiC2 coatings after exposure to pulsed-plasma energy flows. Varying of technological parameters of pulsed-plasma treatment is made by changing the distance of pulse exposure. The analysis of the obtained results shows that the pulsed-plasma treatment technology makes it possible to improve the properties of Ti-SiC based coatings by strengthening the deposited compositions by modifying the structure with an increase in the number of МАХ-phases. It is established that the modification of the structural and phase state of the near-surface layers of the carbosilicide coatings leads to a change in their mechanical properties: an increase in the surface microhardness up to 1.8 times, a decrease in the dry friction coefficient by 1.5-2.0 times and an increase in wear resistance by 2.5 times. Based on the XRD analysis, it is established that the improvement of mechanical and tribological properties of Ti3SiC2 detonation coatings as a result of pulsed-plasma treatment is associated with phase transformations in the surface layer, in particular with an increase in the Ti3SiC2 phase content.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47316950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Obtaining functional-gradient Ti-HA coatings by detonation spraying 爆轰喷涂法制备功能梯度Ti-HA涂层

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/43-51

Zhuldyz Sagdoldina, D. Baizhan, Y. Kambarov, K. Torebek

{"title":"Obtaining functional-gradient Ti-HA coatings by detonation spraying","authors":"Zhuldyz Sagdoldina, D. Baizhan, Y. Kambarov, K. Torebek","doi":"10.31489/2022ph3/43-51","DOIUrl":"https://doi.org/10.31489/2022ph3/43-51","url":null,"abstract":"Functional-gradient titanium/hydroxyapatite (TiHA) coatings were obtained using detonation spraying technology to improve the structure and mechanical properties. To obtain functional-gradient coatings, pulsed energy sources are best suited, namely, detonation spraying, in which the energy of the explosion of gas mixtures is used as a source of pulsed action. By controlling the modes of detonation spraying, it is possible to vary the temperature and rate of coating deposition; accordingly, it is possible to obtain a certain structuralphase structure of the coatings. The structural-phase state and tribological properties of TiHA detonation coatings were investigated by modern materials science methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry and ball-disk wear-resistance test. The results showed that the coatings had a continuously gradient elemental composition across the cross-section of the coatings with no boundary between the elemental layers of the coatings. The amount of Ti gradually decreased and the amount of hydroxyapatite gradually increased in the direction from the substrate to the surface of the coatings, which allows to expand the possibilities of using TiHA-coatings for bone implants. Since the surface layer is composed of HA, the resulting functional-gradient coating demonstrates excellent biocompatibility and the ability to create new bone tissue. The excellent mechanical strength of the functionally graded coatings is ensured by the Ti phase.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48640396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the issue of a new solution of the materials resistance contact problem on compression of elastic cylinders in contact with parallel generators 关于与并联发电机接触的弹性圆柱受压时材料阻力接触问题的新解

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/25-35

T. Brim, B. Abdeyev, G. Muslimanova, S. Baigereyev, G. Baizakova

{"title":"On the issue of a new solution of the materials resistance contact problem on compression of elastic cylinders in contact with parallel generators","authors":"T. Brim, B. Abdeyev, G. Muslimanova, S. Baigereyev, G. Baizakova","doi":"10.31489/2022ph3/25-35","DOIUrl":"https://doi.org/10.31489/2022ph3/25-35","url":null,"abstract":"As a result of logarithmic singularity in the plane classical problem of elastically deformable material mechanics, it is proved that the reference formula for determining the convergence of two statically compressed parallel cylinders made of a homogeneous, isotropic, and physically linear material is not applicable. In the special case of elastic interaction of a cylinder with a half-plane, it is established that the convergence becomes equal to infinity. This paradoxical result confirms the inadequacy of Flaman’s model of a simple radial stress state in determining displacements. Based on this model, it is possible to determine only the stresses in parallel contacting cylinders, while the calculation of displacements, in this case, is not possible. Based on a previously developed and mathematically approximated by the authors flat design scheme of Flaman the algorithm exception of conflicts has been proposed. The algorithm is based on the integral Fredholm equation solution and can be seen as a new fundamental and applied elasticity theory problem, which is of great importance when assessing the contact of refined strength and stiffness of the cylindrical parts of the supporting structures subject to the general and local deformations (cylindrical rollers, gears, pavements with their seal steel rollers, etc.).","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43545066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The use of a cluster-associate pattern for calculation of melt viscosity 熔体粘度计算的簇-关联模式的使用

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/99-107

A.Sh. Kazhikenova, D. B. Alibiyev, A. Smailova, R. Orazbekova, I. S. Kauymbek, Zh. Tentekbayeva

{"title":"The use of a cluster-associate pattern for calculation of melt viscosity","authors":"A.Sh. Kazhikenova, D. B. Alibiyev, A. Smailova, R. Orazbekova, I. S. Kauymbek, Zh. Tentekbayeva","doi":"10.31489/2022ph3/99-107","DOIUrl":"https://doi.org/10.31489/2022ph3/99-107","url":null,"abstract":"The liquid state of the substance is the most complex for theoretical description. Modern ideas about the liquid and its viscosity are reduced to the following: in the structure of the liquid, the spatial arrangement of atoms is not fixed, as in a crystal, and is not in a free state, as in a gas. Therefore, liquid may approach its properties to gas near the boiling point or the solid state near the melting point. Thus, the structure of the liquid is characterized by the short-range order of the bond. The properties of liquid metals are obtained mainly from experimental studies. This article provides mathematical justification for the cluster-associate pattern. The purpose of the study is to show the possibility of applying a semi-empirical model to calculate the viscosity of liquid metals. The proposed model is developed using the concept of chaotized particles, which is based on the Boltzmann distribution. This model is developed based on the association degree of clusters of their crystal-moving particles. For many years, the viscosity of liquid metals has been studied only by experimental methods. The model enables to find melt viscosity values analytically. The calculated viscosity values of some metals are compared to experimental values in this model. It is established that in all cases the obtained values coincide with the experimental values. The correctness of the proposed model is confirmed by the correlation coefficient. The application of the proposed model has been shown previously on some metals. In this work, we also show the applicability of the cluster-associate pattern using the example of beryllium, since it can be correlated with semimetals by many physicochemical properties. The degree of novelty of the scientific results lies in the fact that the obtained high correlation coefficients for the analysed metals indicate their functionality.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42251595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical and Electrical Transport Properties of the ZnO:CdO Composite Film ZnO:CdO复合薄膜的光学和电学输运性质

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-09-30 DOI: 10.31489/2022ph3/12-17

A. Mussabekova, A. Tussupbekova, A. Aimukhanov

{"title":"Optical and Electrical Transport Properties of the ZnO:CdO Composite Film","authors":"A. Mussabekova, A. Tussupbekova, A. Aimukhanov","doi":"10.31489/2022ph3/12-17","DOIUrl":"https://doi.org/10.31489/2022ph3/12-17","url":null,"abstract":"In this work, zinc oxide films and composite ZnO:CdO films with cadmium oxide concentrations of 3 , 5 , 7 , 10 , and 12 were obtained by spin-coating on FTO. The films were annealed in the atmosphere under the same temperature conditions of 450°C. The morphology of ZnO:CdO composite films was studied by the SEM method and an electron-dispersion analysis of the concentration of the studied substance was carried out. The influence of the surface morphology of the composite film with an increase in the CdO concentration from 3 to 12 on the optical and electrotransport properties of the ZnO:CdO composite film was studied. The optical absorption spectra of composite films of zinc oxide and cadmium were measured. A Tauc plot is presented to determine the band gap of a ZnO:CdO composite film. It has been established that an increase in the CdO concentration on the ZnO surface leads to a decrease in the optical band gap. The observed decrease in the optical band gap of the film with increasing CdO is due to the small band gap of CdO. The method of impedance spectroscopy was used to study the main electrophysical characteristics, in particular, the dynamics of charge carrier transfer in nanocomposite films based on ZnO:CdO. It has been established that the CdO layer on the ZnO surface contributes to a decrease in the resistance value of the composite film Rw, an increase in the charge recombination resistance parameter Rrec at the interface, and an increase in the efficiency of electron injection.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46743907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0