Herald of the Kazakh-British technical university最新文献

{"title":"COMPUTER MODELING OF ANTENNAS FOR SMALL SPACECRAFTS","authors":"N. Meirambekuly, B. Bagdatuly, A. Tolegen, D. Kadyrkhan, A. Rakhmetbayeva, I. Askarbekov, Zn. Geroyeva, A. Serik","doi":"10.55452/1998-6688-2024-21-2-207-216","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-207-216","url":null,"abstract":"Antenna systems used in small spacecraft are a very important element of the spacecraft. The limited size and operating features of these devices adjust the development processes of subsystems for them. In this work, wire and microstrip antennas for small spacecraft will be modeled and studied. The software environment chosen for modeling was CST Microwave Studio, which allows modeling antennas and ultra-high-frequency devices as close to reality as possible. In this work, a wire dipole antenna operating at a frequency of 433 MHz and a microstrip antenna operating at a frequency of 2200 MHz will be simulated. The dimensions of the antenna will be selected according to calculations, materials will be selected as close as possible to those available to the authors. The results of the study will be useful for further prototyping and research of these antennas.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"6 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141686040","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}

{"title":"A NEW HYBRID LED DRIVER","authors":"S. Orazbayev, E. Z. Dzhunusbekov, A. A. Evloev, A. A. Kurmasheva","doi":"10.55452/1998-6688-2024-21-2-255-265","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-255-265","url":null,"abstract":"In the paper, the new hybrid LED driver is proposed. The hybrid LED driver combines the idea of pulsed power conversion of a conventional LED driver with the idea of adjusting configurable LED strings synchronously with input voltage like in a direct AC LED module. This synthesis promises to increase efficiency and reduce electromagnetic interference. Due to low power loss a hybrid LED driver is attractive for circuit integration to reduce size and cost compared to the traditional LED drivers. But in the hybrid LED drivers of previous arts the topology exploits LEDs in switch-pulse mode operation, which limits the efficiency because of LEDs slow nature. In addition, the light intensity of the LEDs decreases in pulsed mode. Therefore the new hybrid LED driver is proposed to overcome the drawbacks. The attention was paid to preventing LEDs from hard switching to improve efficiency and alleviate EMI issues. To confirm the results obtained, computer modeling was performed using specialized software.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"5 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141686137","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}

{"title":"METHODS FOR CONSTRUCTING PERMUTATIONS OF AN ARBITRARY FINITE FIELD AND THEIR LINEAR CHARACTERISTICS","authors":"U. K. Turusbekova, S. A. Altynbek","doi":"10.55452/1998-6688-2024-21-2-170-180","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-170-180","url":null,"abstract":"Permutations in a finite field (bijective transformations) are actively studied in many applications, including in information security theory. Permutations are often used as elements for building information processing nodes. In the middle of the 20th century, K. Shannon theoretically justified the basic requirements for mapping performed on such nodes. Currently, when constructing bijective transformations, these requirements are provided by the composition of nonlinear representations given by the table in the field GF(2). The presented paper summarizes the results of work [1] on methods for increasing the dimension of stationary functional systems. Namely, in this paper, approaches to the construction of new permutations from the initial permutations in the finite field are investigated. The linear characteristic is calculated for the constructed permutations. The problem of constructing permutations given by coordinate functions is difficult. The relevance of the topic of the paper is determined by the need to search for new theoretically sound methods for constructing s permutation classes in multidimensional spaces with the required combinatorial-algebraic properties. The paper considers several methods for constructing substitutions of finite fields from initial permutations acting on vectors of smaller dimension. In the binary case, this allows us to find the nonlinearity of the substitutions under consideration, characterizing the proximity of linear combinations of coordinate functions of permutations to the entire class of affine functions. The results of the presented work somewhat expand the possibilities of constructing permutations for an arbitrary finite field.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"62 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687152","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}

{"title":"DYNAMICS OF A THERMOELASTIC ROD UNDER UNSTEADY THERMAL AND FORCE INFLUENCES","authors":"N. Z. Ainakeyeva","doi":"10.55452/1998-6688-2024-21-2-181-192","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-181-192","url":null,"abstract":"Rod elements are extensively utilized in various technological fields. An unsteady temperature field induces a time-varying stress field within the rod structure, impacting its strength and reliability during operation. Determining the thermally stressed state of rod structures, considering their mechanical properties (especially elasticity), is a significant scientific and technical challenge. The application of mathematical modeling methods enables the study of thermodynamic processes occurring within a structure and its elements, allowing for the determination of their dynamic and strength characteristics during the design phase. This paper addresses the Cauchy problem for the dynamics of a thermoelastic rod under arbitrary initial conditions and subjected to force and thermal influences. By employing the Green’s tensor for thermoelasticity equations, an analytical solution is derived, which determines deformations, stresses, and temperatures at any point along the rod at any given time, provided the initial state and the acting force and heat sources are known. Numerical calculations of temperature and displacement are presented for cases involving pulsed concentrated force and heat sources. Additionally, solutions to Cauchy problems under the influence of regular force and heat sources distributed along the rod are computed. The developed program allows for the investigation of thermodynamic processes in rods with various physical and mechanical properties, under the influence of both distributed and concentrated pulsed thermal and force sources, described by singular generalized functions.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"2 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141686145","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}

{"title":"PRE-CONDITIONING METHOD FOR SUBSTANTIALLY SUBSONIC FLOWS","authors":"A. Мanapova, A. Beketaeva, V. Makarov","doi":"10.55452/1998-6688-2024-21-2-193-206","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-193-206","url":null,"abstract":"The proposed work is a detailed numerical simulation of three-dimensional subsonic turbulent flow in a channel, with the main focus on symmetric perpendicular jets arising from the walls. The solution of the Favreaveraged Navier-Stokes equations closed by the turbulence model is carried out using an algorithm based on the ENO scheme. To accelerate the convergence of the iterative process, a preconditioning method is used and a transition to a vector of primitive variables is performed. The results of the study are essential for a better understanding of subsonic turbulent flows and may find applications in various fields, including engineering and scientific research. The relevance of the work is highlighted by the development of efficient numerical algorithms capable of solving subsonic three-dimensional Navier-Stokes equations using high-order accuracy schemes, as well as the application of robust turbulence models to analyze supersonic multicomponent flow. The scientific novelty of the work is the successful use of the preconditioning method to accelerate the convergence of the iterative process.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"12 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687233","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}

{"title":"GAS-DYNAMIC PROCESSES OCCURRING DURING THE DESTRUCTION OF GAS PIPELINES AND METHODS OF THEIR ANALYSIS","authors":"N. Zhangabay, U. B. Ibraimova, U. Suleimenov, S. Buganova, A. B. Utelbayeva","doi":"10.55452/1998-6688-2024-21-2-238-254","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-238-254","url":null,"abstract":"The process of dynamic destruction of a typical section of a steel main gas pipeline with a crack under the action of gas dynamic pressure is considered. The high-speed development of a crack, which grows under the action of a large amount of gas flowing out under high pressure, is investigated. The process of the main crack movement, which is induced by the gas movement, is modeled. The mathematical model of this process includes a model of gas-dynamic processes in a pipe and a model of high-speed deformation and fracture of a pipe section with a crack. An approximate analytical model of gas-dynamic processes is proposed, which makes it possible to simulate the dynamic decrease in pressure on the inner surface of the pipe and the crack bank. The dynamic pressure change is based on decompression of gas in the localized part of the pipe in the vicinity of the crack. The model takes into account the change in gas pressure in the pipeline along the longitudinal coordinate of the part of the pipe with a crack. A numerical procedure for calculating the gas dynamic pressure when gas flows through a crack is considered. It allows you to determine the pressure on the crack banks as a function of time. The results of this numerical procedure are used for numerical simulation of high-speed deformation and avalanche destruction of a typical section of a main gas pipeline with a crack. An analytical model is proposed that uses the methods of fracture mechanics to predict the critical pressure at which crack growth in the pipe is observed. The model is verified according to experimental data and serves for a quick assessment of the integrity of the pipe. This analytical approach is used to predict the possibility of pipe failure based on material properties, crack geometry and pipe dimensions. It can be used for preliminary estimation calculations. A numerical-analytical method for the analysis of inelastic dynamic destruction of a pipe is considered. It is based on the analysis of the magnitude of the crack tip opening angle. A numerical method for analyzing the stress state in the crack region, taking into account plastic deformation, is also considered. The presented models allow numerical methods to investigate the dynamics of crack development and, as a consequence, the destruction of typical sections of main gas pipelines under pressure. Using the results of these studies will make it possible to take preventive measures to prevent cases of avalanche destruction of emergency sections of main pipelines.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"108 1‐4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687245","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}

{"title":"SYNTHESIS OF ZINC, COBALT AND COPPER HYDROXY-CARBONATES FOR CREATION OF ELECTROCHEMICAL NON-ENZYMATIC GLUCOSE SENSOR","authors":"Zhanar Kalkozova, U. A. Balgimbayeva, A. Serikkanov, Khabibulla Abdullin","doi":"10.55452/1998-6688-2024-21-2-273-280","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-273-280","url":null,"abstract":"Non-enzymatic glucose sensors are promising for reusable electrochemical test systems because of their high sensitivity, fast response and ease of operation. A wide class of materials such as noble metal nanoparticles, composites based on carbon nanomaterials, and metal oxides are used to create non-enzymatic glucose sensors. The search for new materials for the creation of highly sensitive glucose sensors is an urgent task. In the present work a new sensor material promising for the creation of glucose biosensors is investigated. Zinc, cobalt and copper hydroxy-carbonates were synthesized by hydrothermal method at 120 oC and characterized by scanning electron microscopy, X-ray diffraction analysis, Raman spectroscopy and electrochemical methods. It is shown that the synthesized material exhibits high sensitivity to glucose (11.2 mA*mM-1*cm-2), wide sensitivity range, thermal stability and is promising for the development of non-enzymatic glucose biosensors. The limit of detection, evaluated by the magnitude of the electrochemical response when the glucose concentration was varied within the interval up to 0.5 mM, was 0.007 mM. The obtained material showed thermal stability up to 200 oC when heated in an oxidizing atmosphere, which is important for ensuring long-term stability of sensory characteristics.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"11 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141684213","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}

{"title":"CONTROL OF THE SIZES OF LEAD SULFIDE (PBS) NANOPARTICLES BY PLASMA TREATMENT METHOD","authors":"G. Amirbekova, Zh. K. Tolepov, N. Guseinov, M. Tulegenova, B. G. Orynbai, T. Koshtybayev, Zh. Otarbay","doi":"10.55452/1998-6688-2024-21-2-266-272","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-266-272","url":null,"abstract":"In this work, the optimal parameters for the production of lead sulfide nanoparticles (PbS) were determined. Lead sulfide nanoparticles were obtained by chemical precipitation in an aqueous solution of lead nitrate (Pb(NO3 )2 ) 25 ml 0.18 M (1.524 g), sodium hydroxide (NaOH) 75 ml 0.38 M (1.172 g), thiourea (CH4 N2 S) 50 ml 0.11 M (0.399 g), at a reaction temperature of 100 °C, the duration of the synthesis reaction was 120 minutes. The particles were deposited on a pre-purified silicon (Si) substrate. After synthesis, the particles were processed in a glow discharge plasma in an argon atmosphere at a pressure of the order of Ð=1 Pa, for t1 =1min and U = 2 min, at a voltage ofU = 2 kV and a current strength of I =1,5 mA. The morphology of the obtained structures was studied using a scanning electron microscope (SEM), the elemental composition of the particles was determined by energy dispersion analysis (EDX). Plasma treatment reduces the average particle size from the submicron to the nanometer range.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"44 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687929","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}

{"title":"MICRO- AND NANOMICROMATERIALS IN PYROTECHNICS","authors":"Zh. Aimasheva, D. Ismailov, V. F. Grishenko, S. Bellucci, G. Partizan, T. B. Koshtibayev","doi":"10.55452/1998-6688-2024-21-2-229-237","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-229-237","url":null,"abstract":"Due to their unique physical and chemical properties, which play an unrivaled role in enhancing the performance and safety of pyrotechnic substances, carbon nanomaterials have garnered significant interest from researchers in recent years. In this paper, carbon nanostructures prepared by electric arc synthesis are identified as C60 and C70 fullerene carbon blacks. The carbon black particles derived from the synthesized fullerenes exhibit a porous and rough morphology, with sizes ranging from 32 to 190 nm. The experimental results indicate the potential use of synthesized fullerene soot as a constituent component of pyrotechnic composites. The dependence of pyrotechnic composite compositions on combustion time has been determined by selecting potassium nitrate, nanoscale fullerenes, composite carbon blacks, wood coals, and aluminum fillers as matrix materials. According to the findings, the combustion time of the composite composition increases as the content of fullerene soot in the pyrotechnic composite composition increases.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"25 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141684532","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}

{"title":"DEVELOPMENT OF A WEB APPLICATION FOR DATA ANALYSIS AND VISUALIZATION TO ENSURE THE SAFETY OF TECHNOLOGICAL PROCESSES","authors":"I. Uvaliyeva, S. Rustamov, S. Belginova, Zh. Rakhmetullina","doi":"10.55452/1998-6688-2024-21-2-65-82","DOIUrl":"https://doi.org/10.55452/1998-6688-2024-21-2-65-82","url":null,"abstract":"Modern technologies have developed quite well lately, and in addition to the banal data collection and processing, modern algorithms are able to predict the behavior of equipment and prevent the occurrence of malfunctions and failures in advance and take actions to reduce the likelihood of an accident and warn the relevant employees. Within the framework of this study, the authors proposed the development of a web-application for the analysis and visualization of data from UK-TPP to ensure the safety of technological processes. Ust-Kamenogorsk TPP is a regional thermal power plant, heat and electricity generation covers 80% of the load of the housing and communal sector of the city and industrial enterprises. The TPP is part of the unified energy system of Kazakhstan. The application being developed has a web interface that will display and visualize data from the main sensors and instruments of the UK TPP, as well as prevent equipment malfunctions and analyze the behavior of sensors using machine learning. Node.js was chosen as the main software platform used, built on the java script programming language, using additional modules that expand the capabilities of this programming language, written in c ++, which speeds up working with data arrays, receiving, and sending them.","PeriodicalId":447639,"journal":{"name":"Herald of the Kazakh-British technical university","volume":"223 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141692821","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}