bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculation of the optimal diameter of the air intake of the propulsion system for small spacecraft
Authors: Sadretdinova Elnara , Tikhonov Vyacheslav , Slabodenyuk Ilya , Podolskiy Aleksandr 
Published: May 2021

Abstract
The article presents the calculation of the optimal diameter of the mesh channel of the air intake of the propulsion system of a small spacecraft, which operates on outboard air. Graphs of the dependence of the efficiency of the air intake on its diameter, the dependence of the mass flow rate of particles m on the diameter of the air intake are obtained. The analysis of the environmental friendliness of creating a propulsion system by the EIO method is carried out. The assessment of the harmfulness effect of the device on the environment during its operation was carried out.
Normalization of data for training and analysis by the MaskRCNN model using the k-means method for a smart refrigerator’s computer vision
Authors: Dorrer M G , Alekhina A E 
Published: May 2021

Abstract
The authors propose to use the k-means method for semantic image segmentation in the artificial vision of a smart refrigerator. The authors have developed a new two-tier architecture for the semantic segmentation system. In the proposed architecture, various sets of image contrast optimization settings are used to classify pixels belonging to fragments of the studied image. Experiments have shown that the proposed method has decisive advantages over existing works. The k-means method was used to cluster pixels directly into semantic groups. The clustered data is used to solve the semantic segmentation problem. For the correct selection of the number of centroids of the k-means method, the mean shift method was used. Extensive experiments with the traditional k-means algorithm and mean shift method have shown the advantage of the proposed approach in accuracy and performance.
Technique for optimizing the technological process of manufacturing electrical radio products in the context of digital transformation of production
Authors: Petrushevskaya A A , Aleshkin N A 
Published: May 2021

Abstract
The article discusses the process of optimization of production processes for the manufacture of electronic products in the context of the implementation of the concept of digital transformation of industrial enterprises. One of the elements of digitalization used to improve the effectiveness of electronics manufacturing technology in industry is Design for Manufacturing (DFM) in the MatLab computer mathematics environment. The technological production cycle is illustrated in the form of a graph diagram using the apparatus of Markov chains. The application of the developed methodology, as well as the use of graph theory in the technological process of a modern industrial enterprise, allows achieving the required performance indicators, due to the optimal reflection and fixation in the database of non-stationary influences that cause deviations, which are leveled due to adaptive control actions.
Research of the methodology of the development of the demo exam in Russia and its aspects in the competence Digital metrology
Authors: Epifancev K , Suslin A 
Published: May 2021

Abstract
Nowadays, the demo exam is becoming a frequently used way to additionally test the knowledge of students in technical schools and colleges. However, due to the difficult epidemiological situation, this process is carried out remotely. Let’s consider the features of the demo exam in this format. The demo exam changes the perception of learning, because the traditional final qualifying work becomes only a small part of the main exam. On the frontier of successful completion of education, there is the ability to work with measuring equipment, the skills of perceiving production tasks and the possibility of solving them in the shortest possible time. It is important to note in this case the complexity of the transition to this type of exam for many students who are accustomed to perceiving the defense of their graduation work as a formal process associated with retelling a pre-written text. The demo exam is a bridge between theory and practice, which must be introduced gradually into the education system in order to eliminate a negative effect.
Control the quality of polymers based on the model of Dzeno
Authors: Chabanenko A V , Kurlov V V 
Published: May 2021

Abstract
Numerical methods for solving mathematical problems describing the state of complex physical systems in modern digital production can be used to assess the quality and viability of materials used in additive manufacturing. In this article, the Dzeno model is chosen, as the physical behavior of the body under dynamic load and the gradual attenuation of the load.
Experience in the use of lean-technologies in organizing a competition at a research institute
Authors: Eropkin A M , Mezina N A 
Published: May 2021

Abstract
The experience of using lean manufacturing tools in organizing of preparations for the participation of the young scientists of research institute in competitions is considered. There are typical features of such competitions and their significance for the development of the young scientists. Particular attention is paid to the most prestigious competitions organized by the Russian Foundation for Basic Research (RFBR). The composition of the processes affecting the efficiency of work created at the research institute and the unit for working with the young scientists is determined. One of the most labor-intensive processes, the process of preparing tender documentation, is described. By analyzing the process under consideration, the losses that occur in it are identified and analyzed. It was established that the main losses are not in the substantial work on the preparation of tender documentation, but in passing it through a significant number of instances within the research institute. The process consists of approximately 50 works and takes at least 25-30 days. A number of steps are proposed aimed at reducing such losses, using the Kanban signal system and 5S system. In particular, a special electronic folder with a navigator has been created, containing all the necessary document templates.
Forecast of solid waste generation in Atyrau region
Authors: Yessenamanova M S , Salykhov R , Tlepbergenova A E , Yessenamanova Zh S , Tauova N R 
Published: May 2021

Abstract
The article calculates the formation of solid household waste in the city of Atyrau and 7 districts of Atyrau region. The calculation was carried out taking into account the number of people in the previous four years, based on the characteristics of the average population growth. According to calculations for the next 5 years (2020-2024), the amount of waste in Atyrau will increase every year, which is associated with an increase in the population. Among the districts can be identified such areas as Zhylyoy district. Inder district and Makat district, where there is a significant increase in waste, as the population growth in these areas is positive (0.1% in Inder district, 0.34% in Makat district and 1.3% in Zhyloy district). In the Issatay district, an increase is also predicted, but only slightly, since the population growth is 0.09%. In the remaining three districts, such as Kurmangazy district, Kyzylkuginsk district and Makhambet district, the amount of waste will decrease annually, which is associated with a decrease in population growth, while the maximum decrease is typical for Makhambet region (-4.18%). In the Kurmangazy and Kyzylkoginsk areas, the population growth rate of -0,41% and -0,72%, respectively.
The development and implementation of a multidimensional relational database of fire danger metrological data
Authors: Glagolev V , Bazhenov R , Aibashev M , Borodin I , Dolmatova O 
Published: May 2021

Abstract
The study designs and implements a multi-dimensional relational database of fire danger metrological information, as well as areas with vegetation. During conceptualization, OLAP algorithms are taken into account as applied to the selection of long-term meteodata and their mathematical processing presented by multidimensional hypercubes. When designing the SQL structure, a layered architecture of geographic information system (GIS) is used, including attribute and geographical characters. The data according to the technology is tested in the Jewish Autonomous Region. The database contains metrological information from five weather stations from 1960 to 2020 and five branches of local forest districts from 1997 to 2020. At present, data is being filled in for the Omsk Region, Primorsky Krai of the Russian Federation and the Osh Region of the Kyrgyz Republic.
Specific features of potable water purification process
Authors: Alekseeva A , Karpunina I , Klyachkin V 
Published: May 2021

Abstract
Under this consideration there is a process of potable water purification, where the chemical and physical characteristics (water turbidity and color, aluminum and chlorine content, etc) are monitored. To work with correlated characteristics it is necessary to apply to multivariate methods. The peculiarities of Hotelling charts plotting for individual observations are well known, but generalized variance charts plotting causes some problems connected with the assessment of covariance matrix for individual observations. Solving this problem one question arises: how often is it necessary to update the limit lines on the charts? We suggest applying to the test methods of the hypothesis on the equality of the mean.
Application of the factor-criteria model as an important component of the economy and organization of metrological support of an educational holding
Authors: Gorobets Daniil , Lukyanova Yelena 
Published: May 2021

Abstract
Enhancing of educational system is characterized with intensification of innovations appliance at organizational processes in accordance to requirements of modern standards. An educational holding becomes the specific form of development for establishments of higher education, and it requires peculiar system for the economy and organization of its metrological support. An important component in such system is an application of specific evaluation that represents state and prospects of educational holding as an object of control. The article discloses characteristics of application of the factor-criteria model as an important component of the economy and organization of metrological support of the educational holding. It suggests parameters for evaluation of effectiveness of management enhancing at educational holding and factor-criteria model for management estimation of development of establishments of higher education.
Geoinformation and management systems for water management complexes
Authors: Epifanov A V , Antonov I V , Frolov G Y 
Published: May 2021

Abstract
The existing information and automated systems in the field of collecting and storing information about water users and water bodies are considered. The problems and the necessity of implement a unified information management system are analyzed. The list of necessary initial information for the work of «GIMS-water objects» and the sources of its receipt are defined. The structure and main functions of «GIMS - water objects» for the purposes of water management are described.
Design of landing of assembly machine building units with circulating load rolling bearing rings
Authors: Rogovskii I L , Titova L L , Voinash S A , Melnyk V I , Yu Remshev E , Galiyev R M , Nuretdinov D I , Vornacheva I V 
Published: May 2021

Abstract
The article presents the results of solving the scientific problem of ensuring folding, which is complex and includes the appointment of optimal tolerances, maximum deviations and landings in the design. The authors presented for selection of locally loaded bearing rings the field of tolerances of holes and shafts depending on type of bearings, operating conditions and the nature of load. The authors consider the definition of the dynamic coefficient through the value of the landing on the minimum tension between the circulating load ring and the surface of the connected part. Checking the correctness of the choice of landing involves ensuring the condition of strength at the allowable tension. The authors determined the equivalent dynamic load for the established requirements for design of rolling bearings, taking into account the load variability of 6005 N and calculated the durability of 9500 hours. In article it is established that on diameters of openings of demountable cases under external rings with local loading it is expedient to assign fields of tolerances H6, H7, G6, G7. The article confirms the possibility of periodic rotation of the bearing ring during the operation of the folding unit and reduce the uneven wear of the raceways.
Thermal conductivity of composite materials in the range from 7 to 80 K used in cryogenic engineering
Authors: Brodnikov A F , Bragin A V , Vichareva N A , Kazantsev F P , Kondratyev V I 
Published: May 2021

Abstract
A method and a measuring device designed to determine the thermal conductivity of existing and newly created composite materials used in superconducting magnets and other objects of cryogenic technology are considered. The results of studies of the temperature dependence of the modern advanced materials thermal conductivity in the range from 7 to 80 K are shown.
Satellite communication station for Ka and Q-bands
Authors: Dmitriev D D , Gladyshev A B , Ratuschnyak V N , Tyapkin V N 
Published: May 2021

Abstract
The article reveals the features of the organization of satellite communication systems in the remote and northern territories of Russia. The importance of providing broadband access to multimedia resources and the Internet is shown. The problems of development of an earth station of satellite communication Ka and Q-bands, providing broadband communication, are considered. Its architecture and operating principles are presented. To ensure the possibility of operation of the station in two frequency ranges, replaceable irradiation systems with a microwave path are used. The features of their manufacture are disclosed in detail. The results of experimental studies of irradiating systems with a microwave path are presented. The gain of the irradiating system with a microwave path of the Q-band in the composition with a parabolic mirror with a diameter of 1.2 m was 51.8 dB at the transmission frequencies, and 45 dB at the receiving frequencies. The gain of the irradiating system with the Ka-band microwave path was 47.8 dB at the transmission frequencies and 43.8 dB at the receiving frequencies. Thus, the use of the proposed earth station of satellite communication Ka and Q-bands will allow organizing satellite broadband communication in remote and northern territories of Russia.
Analysis of the vibrations of a console column made on a base with non-line protection in gin
Authors: Djuraev A , Narmatov E A , Murodov O J , Yormamatov T , Kh Olimjonov B 
Published: May 2021

AbstractThe article presents a constructive scheme and the principle of operation of the cantilever grate of a saw gin installed in the housing by means of a rubber gasket consisting of two rubber elements having different stiffness. The results of the study show that when sawing raw cotton, the saws touch the working part of the chimneys, causing blockages, which leads to damage to the fiber, as well as a decrease in the overall quality of the fiber. In this case, the total stiffness was obtained with a nonlinear characteristic. A mathematical model and its solution by an approximate analytical method. A numerical solution of the problem constructed graphical dependencies and on the basis of their analysis, the necessary values were recommended.
Multi-media animation technology for cyber-production design
Authors: Babenkov V I , Shukalov A V , Zharinov I O 
Published: May 2021

Abstract
The cyber-production animation design multi-media paradigm is to construct together the technological division architecture and industrial object control laws. In architecture solutions the designers pay attention to space plant and technological aggregates models (geometrical). The object control laws design is based on regulation models in time area. To reach the target cyber-production characteristics they apply automatizing tools where the primary optimal criterion is the technological processes parameters indirect measurement minimal inaccuracy. There is a scheme how the cyber-production project quality criterion is formed. The cyber-production components control methods and approaches identical state can be seen through a separate workshop cyber-segments level and also in the general industrial object level. There are algorithms how to project a cyber-production with a given criterion. The cyber-production project virtual tests and production and time models validation are based on unique experiments made by a designer in the multi-media environment.
Application of mathematical data processing to determine the actual technical state of the motor-wheel belaz gear box
Authors: Kudrevatykh A V , Furman A S , Ascheulov A S , Ashcheulova A S , Karnadud O S 
Published: May 2021

Abstract
Continuous plant operation is provided with machinery and equipment, which is in technically serviceable condition. Timely diagnostics of the actual technical condition of equipment and units components will allow avoiding unforeseen failures and making unscheduled maintenance or repair works. Thus, this technological operation will allow keeping the used equipment in work condition. Among the promising methods for diagnosing the actual technical condition of gearboxes of motor-wheels of open -pit dump trucks BELAZ, vibration, noise measurement and thermal methods are marked. However, it is necessary to apply mathematical methods of processing and modeling of wear processes for more accurate processing of the obtained parameters. Thus, not only the continuous operation of equipment is achieved by means of set of methods, but also the productivity of the coal mining complex increases by means of increasing the equipment resource.
To the solution problems of contact interaction in a two-roll module
Authors: Khurramov Sh R , Bahadirov G A 
Published: May 2021

Abstract
The basic problems of the theory of contact interaction in a symmetric two-roll module are solved. Mathematical models of roll contact curves, friction stresses and distribution patterns of contact stresses in a symmetric two-roll module are obtained. Expressions that determine the indices of the roll contact curves in a symmetric two-roll module are derived. It was revealed that the neutral point in the drive roll is to the left of the centerline, and the maximum point of the diagrams of normal contact stresses does not coincide with the neutral point and is either in the no-slip zone or in the backward slip zone.
Evaluation of probabilistic characteristics of measurement results during parts inspection
Authors: Leonov O A , Zh Shkaruba N 
Published: May 2021

Abstract
The features of control of linear dimensions in repair production have presented. The main factors influencing the measurement results have identified. Possible consequences of the influence of the measurement error in the control of linear dimensions have indicated. The analysis of existing methods for assessing the probabilistic characteristics of measurement results has carried out. A diagram of the control of parts such as a hole, has been drawn up, which reflects the probabilistic characteristics of the measurement results, taking into account the influence of the error on the sorting results. The results of approbation of the developed technique have presented on the example of measuring the diameters of the restored main and connecting rod journals of the engine crankshafts.
The formation of defects during the reeling of raw silk
Authors: Alimova Kh , Bobatov U , Akhmedov J A , Sobirov Q E , Umurzakova Kh Kh 
Published: May 2021

Abstract
There is information on the state of development of the silk industry in Uzbekistan, the tasks set and the work being done. This article describes the causes of defects in the production of high-quality raw silk, the effect of defects in the cocoon shell and methods for their elimination. The effect of the quality of raw silk on the formation of defects in raw silk in silkworm breeding has been studied. the effect of the correct execution of agrotechnical rules on the amount of defective cocoons and the relationship of shell damage during loading were studied. The origin of defects in the process of reeling and methods of their elimination are given. The effect of defective cocoons on the quality of raw silk has been given a practical justification. The results of the experiments are presented in pictures and tables.
Metrological control of welded sheet joints
Authors: Emelyanov R T , Sabinin V L , Turysheva E S , Shmidt A V , Grudinin I A , Borodin A S 
Published: May 2021

Abstract
The results of metrological control of welded sheet joints of studies at low-frequency processing are presented. During fusion welding, a field of residual elastic stresses is created in structures, which are extremely unevenly distributed in them. To equalize the stresses, stabilization is performed using special vibration exciters (vibrators) based on low-frequency mechanical vibrations. This provides dimensional stabilization of welded structures made of low carbon steel. The author investigated the process of vibration hardening of welded sheet joints with several combinations of adjustable parameters. As a result, graphs of accelerations and vibration amplitudes of the exciter and the system were obtained. An assessment of the influence of alternating stresses on the value of residual stresses in the welded joint is given. The theoretical studies of the vibration molding process have been confirmed.
Energy distribution modelling in the weld zone for various electron beam current values in COMSOL Multiphysics
Authors: Tynchenko V S , Kurashkin S O , Murygin A V , Tynchenko Ya A 
Published: May 2021

Abstract
The presented work is devoted to the study of the effect of various values of the electron beam current on the distribution of the energy cross section of the weld when conducting the technological process of electron-beam welding of thin-walled structures. The work is used by the simulation system of COMSOL Multiphysics, in which mathematical models of energy distribution proposed by the authors are implemented with electron beam welding. Imitation modelling was carried out for two materials widely used in the aerospace industry: titan alloy BT14 and AMG aluminum alloy. The values of the parameters for which the simulation was carried out were selected as a result of the predetermined process of optimizing the technological mode of electron beam welding for the construction under study. In the process of the research, a change in the value of the electron beam current is carried out both in less and to the large side. The article presents visualization for the three values of the parameter under study for each material, which makes it possible to judge the effectiveness of the previously formed set of optimal parameter values.
The influence of vibration on sedimentation stability of polymer composite materials
Authors: Sharshin V N , Sukhorukov D V , Sukhorukova E V 
Published: May 2021

Abstract
The work is devoted to the study of the effect of vibration on the creation of a gradient layer in cast polymer composite materials. The influence of vibration frequency and vibration exposure time on the distribution of filler particles in a polymer matrix has been studied. The presented results can be used in the manufacture of cast parts for the needs of mechanical engineering from polymer composite materials with an increased content of particles of the dispersed phase.