Bulletin of the University of Karaganda-Physics最新文献_第10页

Evaluation of the Nurse-Saul method using maturity sensors for concrete strength control 使用成熟度传感器对Nurse-Sol方法进行混凝土强度控制的评估

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Bulletin of the University of Karaganda-Physics Pub Date : 2022-03-30 DOI: 10.31489/2022ph1/66-74

Y. Utepov, A. Aniskin, A. Tulebekova, S. Akhazhanov, Sh. Zharassov

{"title":"Evaluation of the Nurse-Saul method using maturity sensors for concrete strength control","authors":"Y. Utepov, A. Aniskin, A. Tulebekova, S. Akhazhanov, Sh. Zharassov","doi":"10.31489/2022ph1/66-74","DOIUrl":"https://doi.org/10.31489/2022ph1/66-74","url":null,"abstract":"The article presents the results of experimental studies on the strength of concrete grade B25 brand M350 by direct and indirect methods of control. To conduct tests, 17 cylindrical, 15 small, and 2 large cubic specimens were manufactured. 15 cylindrical specimens by 3 pieces were tested for compression in a hydraulic press on 1, 3, 7, 14, and 28 days of curing, and in the remaining two for 28 days the curing temperature was measured in order to obtain the strength-maturity relationship by the method of Nurse-Saul. The curing temperatures of the larger specimens were measured similarly, from which the concrete maturity and strength values on days 1, 3, 7, 14, and 28 were estimated. On the same days, compression tests were carried out on small specimens and by the shock pulse method on large specimens. As a result, the strength gain curves were obtained and calibration dependencies were plotted. The calibration dependencies showed a sufficiently close convergence of the results of the direct method of control (i.e., compression of small specimens) and the Nurse-Saul method of maturity, in contrast to those of the shock pulse method. The determination coefficients of these dependencies amounted to 0.9357 and 0.8965, respectively.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47903301","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

Study of polyamorphic transformations in the cryomatrix of nitrogen in cryovacuum condensates of water 水的低温真空冷凝物中氮在低温基质中的多晶转变研究

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/52-60

A. Aldiyarov, K. Beisenov, U. Suiinzhanova, D. Yerezhep

{"title":"Study of polyamorphic transformations in the cryomatrix of nitrogen in cryovacuum condensates of water","authors":"A. Aldiyarov, K. Beisenov, U. Suiinzhanova, D. Yerezhep","doi":"10.31489/2021ph4/52-60","DOIUrl":"https://doi.org/10.31489/2021ph4/52-60","url":null,"abstract":"One of the important tasks of modern physics of condensed matter is to establish an unambiguous connection between the conditions of formation and the properties of the resulting solid phase. Its solution will contribute to major breakthroughs in the creation of materials with desired properties. As any scientific and technological problem, this approach is associated with the need to address a wide range of fundamental issues. The basis for success in this direction is the implementation of a complex not only with model tests, when the investigated substance is important from a practical point of view, but in itself has interesting physical properties; such objects can be fully attributed to chemical properties. Hydrogen-bonded substances, in which, in addition to van der Waals forces, interactions due to the presence of an intermolecular hydrogen bond play an important role. The obtained method of cryomatrix isolation facilitates assuming that in the process of cryocondensation of pure components of water and ethanol at an intermediate stage in the adsorbed layer, there is a process of formation of clusters with a short-range order similar to the liquid state of water or ethanol","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42722896","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

Thermal Unit with Controlled Distribution of Flow Speeds of Processed Raw Materials in Zones of Electrified Modules 在电气化模块区域内控制加工原料流速分布的热单元

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/68-77

A. Nizhegorodov, A. Gavrilin, B. Moyzes, K. Kuvshinov

{"title":"Thermal Unit with Controlled Distribution of Flow Speeds of Processed Raw Materials in Zones of Electrified Modules","authors":"A. Nizhegorodov, A. Gavrilin, B. Moyzes, K. Kuvshinov","doi":"10.31489/2021ph4/68-77","DOIUrl":"https://doi.org/10.31489/2021ph4/68-77","url":null,"abstract":"The article reviews the possibility of thermal treatment of vermiculite concentrates in thermal units of the modular-launch type after the defects of the units appeared during operation were fixed. It was observed that the temperatures of the electric heaters and the refractory surface of the firing modules distribute unevenly horizontally: the temperatures decreased significantly from center to periphery. This feature showed a technical solution — the division of the total flow of the expanded vermiculite into local and controlled flows between the thermal zones of the furnace modules taking into account their temperatures. The required time for particles movement in each thermal zone was determined, as well as average local speeds of their movement in the indicated zones were by comparing the thermal capacities of local vermiculate flows. The calculations of local flow rates were carried out and the total productivity of the modernized furnace was determined. The productivity of modernized furnace is 24% higher than the prototype furnace. It is shown that with an increase in productivity but equal to electricity consumption, the specific energy consumption of firing processes decreases by the same 24%. It makes the furnace more perfect and competitive.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48910500","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

Non-contact Ultrasound Method of Thread Tension Determination for Light Industry Machinery 轻工机械螺纹张力的非接触超声测定法

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/35-45

V. Zdorenko, V. Kucheruk, S.V. Barilko, S. Lisovets

{"title":"Non-contact Ultrasound Method of Thread Tension Determination for Light Industry Machinery","authors":"V. Zdorenko, V. Kucheruk, S.V. Barilko, S. Lisovets","doi":"10.31489/2021ph4/35-45","DOIUrl":"https://doi.org/10.31489/2021ph4/35-45","url":null,"abstract":"It has been established that with the help of a pulsed ultrasonic signal of complex shape, it is possible to determine the tension of a filament with a high linear density in a special waveguide with a rectangular crosssection. It has been proved that the amplitude ratios of ultrasonic waves that interact with different textile filaments are influenced by their linear density, the angle between the passage direction of part of the waves enveloping the fibers in the middle and the surface of these fibers, as well as the angle between the direction of wave propagation enveloping the thread itself from the outside, and the surface of the whole material. It should be noted that the corresponding bypass angles of the ultrasonic waves of the textile depend on the material porosity, frequency of the ultrasonic waves, and their power. To enable non-contact control of the change in the tension of the thread branch, it is advisable to use a pulsed ultrasonic signal with two different peaks of the waves, amplitudes, which are adjusted to the linear density of the thread and its conditional radius. Additionally, the use of this method will provide operational technological control in the production of textile fabrics","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48658249","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

Impact of Volume and Surface Heat Treatment on the Structure and Properties of Steel 30HGSA 体积和表面热处理对30HGSA钢组织和性能的影响

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/16-24

B. Rakhadilov, D. Baizhan, Zhuldyz Sagdoldina, L. Zhurerova, R. Kozhanova, P. Kowalewski, G. Yerbolatova

{"title":"Impact of Volume and Surface Heat Treatment on the Structure and Properties of Steel 30HGSA","authors":"B. Rakhadilov, D. Baizhan, Zhuldyz Sagdoldina, L. Zhurerova, R. Kozhanova, P. Kowalewski, G. Yerbolatova","doi":"10.31489/2021ph4/16-24","DOIUrl":"https://doi.org/10.31489/2021ph4/16-24","url":null,"abstract":"The work presents the results of a comparative study of volumetric and surface heat treatment impact on the structural-phase states, hardness, and wear resistance of steel 30HGSA. Surface hardening was conducted by the electrolyte-plasma method. Bulk quenching of the samples was carried out by heating to a temperature of 900 °C, followed by cooling in water and oil, and some of the samples after quenching were annealed at a temperature of 510 °C. The structural-phase states of 30HGSA steel samples were studied by metallographic and X-ray structural analysis. There were carried out the microhardness measurements, tribological tests according to the ball-disk scheme, as well as was determined the resistance of the samples to abrasive wear. It was determined that after electrolytic-plasma hardening, fine-acicular martensite with a small content of cementite is formed on the basis of metallographic and X-ray structural analyzes, and coarse-acicular martensite is formed after volume quenching in water and oil. It was determined that the microhardness increased to 400-460 HV after volume quenching, and subsequent annealing leads to a decrease in hardness to 330-360 HV. It was revealed that the electrolyte-plasma surface hardening leads to an increase in microhardness up to 2 times due to the formation of fine-acicular martensite.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44875713","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

Anisotropy of the surface energy of silicides of some metals 某些金属硅化物表面能的各向异性

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/25-34

V. Yurov, V. Goncharenko, V. Oleshko, K. Makhanov

{"title":"Anisotropy of the surface energy of silicides of some metals","authors":"V. Yurov, V. Goncharenko, V. Oleshko, K. Makhanov","doi":"10.31489/2021ph4/25-34","DOIUrl":"https://doi.org/10.31489/2021ph4/25-34","url":null,"abstract":"An empirical model of a solid surface is proposed in the article. The thickness of the surface layer is described in terms of one parameter – the atomic volume of an element or its compounds. Surface energy is also expressed through one parameter – the melting point of a chemical element or crystal. The model proposes equations that allow calculating the thickness of the surface layer and surface energy for each face of the crystal. As an example, calculations of these values are made for silicides of some metals with crystal structures of cubic, hexagonal and rhombic systems. For cubic silicides, the thickness of the surface layer is 3-9 nm, and the number of monolayers is 7-16. Studies of metal deposition on silicon faces have shown that silicon silicide is formed on the (111) face, which has the highest surface energy. The reaction on the (100) face occurs only on the oxidized surface. In hexagonal silicides, anisotropy is seen, both in the values of the thickness of the surface layer and in the values of the surface energy. For example, during the formation of chromium disilicide on the (111) face in the c direction, it was found that the sizes of the islands become larger than on the (001) face. The authors designate that the thickness of the surface layer and the specific surface energy for cubic, hexagonal, and rhombic crystals significantly differ from them. What is the difference? First, the difference between the atoms of chemical elements from the periodic table and their compounds depends, first of all, on their electronic structure, which forms this or that interaction potential. Secondly, the difference between cubic, hexagonal and rhombic crystals lies in their relationship with Poisson's ratio and Young's modulus, that is, on two material parameters. Third, the thickness of the surface layer between cubic, hexagonal, and rhombic crystals also differs in only one parameter – the atomic (molar) volume of the crystal. However, the analysis of all the patterns still needs to be carefully analyzed.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45730939","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

Using a user–defined function in Ansys Fluent to implement the energy release profile in model fuel elements taking into account radiation heating 使用Ansys Fluent中用户定义的功能，在考虑辐射加热的情况下，在模型燃料元件中实现能量释放曲线

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/78-84

N.A. Suleimenov, N.E. Mukhamedov, O. Zhanbolatov

{"title":"Using a user–defined function in Ansys Fluent to implement the energy release profile in model fuel elements taking into account radiation heating","authors":"N.A. Suleimenov, N.E. Mukhamedov, O. Zhanbolatov","doi":"10.31489/2021ph4/78-84","DOIUrl":"https://doi.org/10.31489/2021ph4/78-84","url":null,"abstract":"The paper presents a model of an experimental device tested on the complex of impulse graphite reactor of the Branch IAE RSE NNC RK, designed to study the possibility of changing the neutron spectrum of the reactor from thermal to fast. At the stage of preparation for testing, a series of neutron-physical studies were carried out using the MCNP. The purpose of these studies is to determine the specific energy release both in the model fuel elements and in non-fuel structural elements of the experimental device during their radiation heating, taking into account the thermal state of the reactor core. After that, the obtained data are used as initial conditions for development of user-defined functions and conducting thermophysical calculations to determine the distribution of the temperature field in the tested device, the ANSYS Fluent software package. The method for calculating the specific energy release in non-fuel structural elements during their radiation heating in the impulse graphite reactor, considering its thermal state, has been used relatively recently. It requires a special approach to the implementation of the required energy release profile when carrying out thermophysical calculations in the Ansys software. The paper also illustrates the advantages of using a custom function in Ansys Fluent to define the profile of the energy release in model fuel elements and structural elements of an experimental device depending on time and height. In addition, the results of a thermophysical calculation of the experimental device for determining the distribution and maximum values of temperature in fuel and non-fuel structural elements are presented.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47210503","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

Theoretical study of the Ni–C system in the pressure range of 0–100 GPa Ni–C体系在0–100 GPa压力范围内的理论研究

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/46-51

A. Abuova, T. Inerbaev, F. Abuova, G. Kaptagay

引用次数: 1

Development of the algorithm for calculating the optimal molding modes of the BeO slurry using various rheological models 利用各种流变模型计算BeO浆料最佳成型模式的算法开发

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/85-93

Z. Sattinova, B. Assilbekov, G. Ramazanova, K.M. Dyusenov

{"title":"Development of the algorithm for calculating the optimal molding modes of the BeO slurry using various rheological models","authors":"Z. Sattinova, B. Assilbekov, G. Ramazanova, K.M. Dyusenov","doi":"10.31489/2021ph4/85-93","DOIUrl":"https://doi.org/10.31489/2021ph4/85-93","url":null,"abstract":"This paper presents the results of calculating a mathematical model of the flow and heat transfer of thermoplastic beryllium oxide in a round channel of a molding installation. An algorithm for calculating the system of equations based on the Herschel-Bulkley rheological model has been developed. The finite-difference analogue of the equations system of motion, continuity, and energy is solved numerically using the CrankNicholson difference scheme. The three-parameter equation is used to test the consistency of experimental, data, and how adequately the physical features of the non-isothermal flow of the slurry convey comparing to the Shvedov-Bingham model. The calculation results illustrate that the proposed model reflects the most important features of the thixotropic flow character of the slurry and is in better agreement with the experimental data of viscoplastic fluids. It provides the calculations of speed of viscous-plastic flow of the slurry based on Shvedov-Bingham and Herschel Bulkley’s two rheological models considering the peculiarities of coagulation structure formation and flow mechanism with boundary conditions. As a result of calculations, the fields of velocity, temperature, and density were obtained, which describe the regularities of the flow and heat transfer of a thermoplastic slurry. The change in the Nusselt criterion along the length of the shaping cavity is shown, which coincides with the analytical solution of Nusselt under first kind boundary conditions. The optimal conditions for the process of ceramics molding by hot casting method have been found, allowing to obtain a hardened product with a homogeneous structure of beryllium ceramics at the outlet.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44691543","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

Theoretical aspects of Photoacoustic Signal Generation with Solid Crystals 固体晶体光声信号产生的理论方面

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Bulletin of the University of Karaganda-Physics Pub Date : 2021-12-30 DOI: 10.31489/2021ph4/61-67

A. Sarode, O. Mahajan

{"title":"Theoretical aspects of Photoacoustic Signal Generation with Solid Crystals","authors":"A. Sarode, O. Mahajan","doi":"10.31489/2021ph4/61-67","DOIUrl":"https://doi.org/10.31489/2021ph4/61-67","url":null,"abstract":"Today, non-destructive analysis techniques play an important role in industrial applications and scientific, as well as technological research. Photoacoustic method is one of such non-destructive methods in which generation of acoustic waves takes place due to the absorption of the modulated incident radiation. Photoacoustic signal is a base for photoacoustic research. The generation of the photoacoustic signal is related to the nature of the cell used for investigation. Though a variety of explainations about signal generation in photoacoustic interaction are reported by many researchers, many aspects are yet to be studied in detail. While investigating a solid crystal in photoacoustics, factors as mode of operation, scheme of excitation, the shape of the cell, and pressure fluctuations in the cell are considered for analysing photoacoustic signal generation. Also, design and performance optimization of the photoacoustic cell play paramount role in determining efficiency of related signal generation. In this paper, theoretical aspects of photoacoustic signal generation for solid crystals are presented. While obtaining the expression for pressure fluctuations with solid crystal, cylindrical configuration of photoacoustic cell is preferred to get a better signal–to–noise ratio. Along with the analysis of other factors, pressure fluctuations generated by the enclosed gas in photoacoustic cell is mathematically determined.","PeriodicalId":29904,"journal":{"name":"Bulletin of the University of Karaganda-Physics","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46932655","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