Physical Sciences and Technology最新文献_第4页

Mathematical model analysis of nonlinear control systems of power turbines operating in condensation mode 凝汽状态下发电机组非线性控制系统的数学模型分析

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.05

Zh. T. Bitaeva, Z. Murzabekov

{"title":"Mathematical model analysis of nonlinear control systems of power turbines operating in condensation mode","authors":"Zh. T. Bitaeva, Z. Murzabekov","doi":"10.26577/phst.2021.v8.i1.05","DOIUrl":"https://doi.org/10.26577/phst.2021.v8.i1.05","url":null,"abstract":"The work is dedicated to modeling&turbine control systems and studying the stability of a nonlinearsystem. The dynamics of the turbine regulation system is described by a nonlinear&system of fourdifferential equations. This system of equations describes the mathematical model of a turbine operatingin condensing mode. Using the transformation&way, the mathematical model of the steamturbineregulation system is reduced to the conclusion of a problem about the unconditional stability of anonlinear stationary system of indirect control. In the study of a nonlinear system, the Lyapunov functionwas applied and the circumstances of unconditional stability were obtained. The conclusion of differentialequations systems is executed in vector-matrix form. The results&obtained for a nonlinear systemare&used to study the durability of a steam turbine. Numerical calculations are presented that illustratethe probability of using the proposed layout and studying the stability of nonlinear control systems forpower turbines. \u0000Key words: stability of a nonlinear system, differential equation, Lyapunov function, mathematicalmodel of a turbine, asymptotic stability, characteristic of nonlinearity.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130004368","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

Earth sensing capabilities yesterday and today 昨天和今天的地球感应能力

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.03

P. Razzhivalov, N. Korobova, S. Shatalova

{"title":"Earth sensing capabilities yesterday and today","authors":"P. Razzhivalov, N. Korobova, S. Shatalova","doi":"10.26577/phst.2021.v8.i1.03","DOIUrl":"https://doi.org/10.26577/phst.2021.v8.i1.03","url":null,"abstract":"At present, the expansion of the orbital constellation of Earth remote sensing satellites continues. Thetechnical characteristics of the imaging equipment are being improved. The article discusses the mainreasons for the inaccurate referencing of Earth remote sensing data, namely, the errors in measuring theparameters of the orbit and the error in the orientation of the spacecraft. It has been established that theGlonass / GPS systems are responsible for the first error, and the devices for determining the coordinatesof stars (orientation sensors by stars) are responsible for the second. The analysis of the modern devicescharacteristics for determining the stars coordinates of spacecraft from well-known world companies hasbeen carried out.It has been established that the results of measurements of these systems and devices must be taken intoaccount in the geometric correction of images. The problems associated with the stages of development,production and control tests of the performance of these devices have been identified. The solution of theseproblems will make it possible to equip spacecraft for remote sensing of the Earth with star sensors, which,working in conjunction with imaging equipment, will be able to provide the required characteristics of theimages obtained with a spatial resolution of less than 40-50 cm and a spatial reference accuracy of 2-3 m.The accuracy of devices measurement for determining the coordinates of stars affects the accuracy of theimages binding of Earth remote sensing. It was found that the accuracy sensor characteristics of the SpaceResearch Institute of Russian Academy of Sciences are in the range from 1 arc.sec. up to 2 arc.sec. Themain contribution to the error is made by the standard deviation of measurements carried out with the helpof devices for determining the coordinates of the stars (random error). \u0000Key words: remote sensing, star sensor, error, orientation.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124140463","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

Modelling of the pulverized coal plasma preparation for combustion 煤粉等离子体燃烧制备的建模

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.02

V. Messerle, A. Ustimenko

引用次数: 2

Exact solution of the fiels equation of the generalized cosmological F(R,T) model 广义宇宙学F(R,T)模型场方程的精确解

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.08

K. Yerzhanov, M. B. Abilmazhinova

{"title":"Exact solution of the fiels equation of the generalized cosmological F(R,T) model","authors":"K. Yerzhanov, M. B. Abilmazhinova","doi":"10.26577/phst.2021.v8.i1.08","DOIUrl":"https://doi.org/10.26577/phst.2021.v8.i1.08","url":null,"abstract":"We considered cosmological model within the framework of the generalized F(R,T) gravityin flat FLRW metric. Earlier, an exponential solution was shown for the generalized case, which describes the inflationary stage of the evolution of the Universe. In this paper, it is shown that for the particular case of the Starobinsky model, the generalized model has, amongother things, a power-law solution that describes the dust-like stage and the stage of radiation dominance.It should be noted that this solution was obtained by the analytical method as a solution to the Euler-Lagrange equation for this model, taking into account the functions u, v– describing the relationship between the curvature scalar and the torsion scalar, and depending not only on the first, but also on the second time derivative of the scale factor. This solution is of interest, since it shows not only that this model has a solution, but also that this solution can describe the modern observable Universe for more complex forms u, v than described earlier.This solution allows other related cosmological parameters to be obtained accordingly. The paper presents the parameter for the equation of state, which describes the stage of the evolution of the Universe. \u0000Keywords:generalized cosmological model, scale factor, Starobinsky model","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126389644","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

Modification of nanostarch by citric acid 柠檬酸改性纳米淀粉的研究

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.09

N. Kaiyrbekov, K. Akatan, S. Kabdrakhmanova, T. Kuanyshbekov, A. Imasheva, A. Battalova

引用次数: 0

Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying 高速气焰技术在自动气焰喷涂机器和机器人表面硬化中的应用

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.06

Sh. A. Bazarbekov

{"title":"Application of high-speed gas-flame technology for hardening the surfaces of machines and robots of automatic gas-flame spraying","authors":"Sh. A. Bazarbekov","doi":"10.26577/phst.2021.v8.i1.06","DOIUrl":"https://doi.org/10.26577/phst.2021.v8.i1.06","url":null,"abstract":"The article discusses the main types of installations (HVOF / HVAF (High Velocity Oxy / Air-Fuel),the Russian analogue of which is HPS/SGV (gas-flame supersonic/supersonic gas-air, activated arcmetallization ADM devices) and the use of high-speed gas-flame technology for surface hardening formachine parts. Here we considered all types of flame treatment (welding, oxyfuel cutting, brazing, surfacehardening, flame straightening, metallization, welding and spraying of non-metals), the performance ofvarious methods of thermal spraying (GTN), and also considered the properties, methods of productionand use of gases used in flame processing, modern equipment and equipment for all considered processes.The main task of the coating obtained by the method of flame spraying is also considered. It is shown thatthe deposition of coatings by the method of high-speed gas-flame spraying and effective materials forprotection is promising. In addition, safety precautions for gas-flame processing are considered. The stateis analyzed that the abrasive wear resistance of steel is a structurally sensitive characteristic, therefore, aneffective wear-resistant material must have the ability to harden under the influence of working loads, duringoperation, and from this, materials are effective materials for protection under abrasive wear; correspondingto the principle of metastable austenite. The characteristics of a heterophase jet obtained under optimalspraying modes are estimated on the basis of a calculation using a mathematical model of a two-phase flow. \u0000Key words: thermal spraying, electroplating, flame technology, corrosion, robots of automatic gas – flamespraying.","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117186901","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

Analytical approximation of cross sections of collisions of electrons with atoms of inert gases 惰性气体中电子与原子碰撞截面的解析近似

Physical Sciences and Technology Pub Date : 2021-06-01 DOI: 10.26577/phst.2021.v8.i1.01

R. Golyatina, S. Maiorov

引用次数: 3

February 25, 2014 solar flare data analysis in SunPy 2014年2月25日太阳耀斑数据分析

Physical Sciences and Technology Pub Date : 2020-12-29 DOI: 10.26577/phst.2020.v7.i2.03

A. Sarsembayeva, F. Belisarova, M. Odsuren, A. Sarsembay

{"title":"February 25, 2014 solar flare data analysis in SunPy","authors":"A. Sarsembayeva, F. Belisarova, M. Odsuren, A. Sarsembay","doi":"10.26577/phst.2020.v7.i2.03","DOIUrl":"https://doi.org/10.26577/phst.2020.v7.i2.03","url":null,"abstract":"Solar flares are strong radiation bursts, whereas large clouds of solar material and magnetic fields thaterupt at high speeds from the Sun are coronal mass ejections. Harmful radiation from a flare does notpass through the atmosphere of the Earth to physically impact humans on the ground, but can disrupt theatmosphere in the layer where GPS and communication signals travel. Flares generate results across theentire electromagnetic spectrum. They emit x-rays and ultraviolet radiation, which means extremely hightemperatures during a flash. Radio waves mean that tiny fractions of particles are accelerated to high levelsof energy. Most of the radiation is synchrotron radiation produced along magnetic field lines by electronstraveling along spiral paths. In this paper was monitored solar flare registered on February 25, 2015. Thisflare, which peaked at 00:49 am EDT from a sunspot called Active Region 1990 (AR1990), is classifiedas an X4.9-class flare. We have performed solar data analysis using the Python/SunPy tool. SunPy waschosen as the principle data analysis environment since it provides easy to use interfaces to the Virtual SolarObservatory (VSO).","PeriodicalId":321102,"journal":{"name":"Physical Sciences and Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126670600","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: 2

Methods of the development of the architecture of the neural networks for identification and authentication of individuals 开发用于个体识别和认证的神经网络体系结构的方法

Physical Sciences and Technology Pub Date : 2020-12-01 DOI: 10.26577/phst.2020.v7.i2.07

O. Golikov, M. A. Ramos

引用次数: 0

The stability of orbit of a planet in the field of binary stars 双星场中行星轨道的稳定性

Physical Sciences and Technology Pub Date : 2020-05-17 DOI: 10.26577/phst.2020.v7.i1.09

S. Toktarbay, A. Talkhat, A. Orazymbet

引用次数: 0