bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multimodal neural network classifier of the functional state of the respiratory system
Authors: Filist S A , Myasnyankin M B , Safronov R I , Kuzmin A A 
Published: November 2021

Abstract
At present, the intelligent systems are used to study the functional state of living objects. They are often built on a multimodal basis, i.e. decision-making is carried out through several information channels with the subsequent aggregation of these decisions. In the proposed method, the electrocardiosignal is a source of information. The principle of multimodality is implemented by analyzing of various methods and aggregating the results using neural networks of block and hierarchical structure. The method was tested on the classification of patients with pneumonia with a clear diagnosis. A group of volunteers without pulmonary pathologies was used as an indifferent class.
Mathematical modeling of spatial gas flow in nozzles of nontrivial geometry
Authors: Bitkin S A , Korepanov M A , Koroleva M R , Karpov A I , Makarov S S 
Published: November 2021

Abstract
Numerical modeling of the spatial gas flow in an adjustable nozzle with an asymmetric critical section caused by the overlap of a part of the flow area by a gas flow regulator has been carried out. The mathematical model is based on three-dimensional models of gas dynamics, the method of large particles is used for calculation. When describing the unsteady flow of an inviscid gas, the system of Euler equations is used, written for a computational rectangular plane, taking into account the function of nozzle geometry. The results of calculations of flow parameters along a nozzle path with a uniform outlet section and with an obliquely cut outlet nozzle are presented. Calculations were carried out for completely open critical sections and for half overlapped. For oblique cut nozzles, the overlap of the critical section from the side of the short part and from the side of the long part of the oblique nozzle is considered.
Investigation of the influence of modification of the working tool for the manufacture of niobium case products
Authors: Yu Remshev E , Rasulov Z N , Voinash S A , Sokolova V A , Teterina I A , Malikov V N , Vagizov T N 
Published: November 2021

Abstract
The main production of machine-building enterprises of various industries is the production of metal parts and products, 90-95% of which are manufactured using metal processing by pressure. Ensuring the stability of the technological processes of cold stamping is impossible without the use of interoperative coatings, which play the role of lubrication, preventing the diffusion “setting” (interpenetration at the atomic-molecular level) of the processed materials and tools. Therefore, one of the tasks in constructing the technology for manufacturing parts from these materials is to conduct a test cycle to establish the most acceptable coatings at the intermediate stages of processing. In the process of studying the operability and manufacturability, it is also advisable to use new methods for evaluating quality indicators at separate stages of processing semi-finished products and at the stages of control of finished products, which allows practically eliminating defects due to internal defects, ensuring the uniformity of the microstructure and predicting the operability of finished products during operation. Ensuring the quality of stamped semi-finished products made of refractory metals (niobium, molybdenum) is an urgent task due to the significant proportion of defects during cold stamping of these parts.
Design of replaceable nozzles for connecting pipelines in electron beam welding
Authors: Tynchenko V S , Kukartsev V A , Dokshanin S G , Fedorova A V , Slinitsyna V , Stephanenko O S 
Published: November 2021

Abstract
The article is devoted to the use of electron beam welding for connecting pipelines in the oil and gas industry. The analysis of the proposed approach and equipment for creating permanent pipe-flange connections is carried out. The advantages and disadvantages of the proposed approach are considered. During the work, the welded seam was calculated. A set of interchangeable attachments for the turntable has also been developed. Thus, the purpose of this work is to improve the quality of welded joints of oil and gas equipment through the use of electron-beam welding technology and design of replaceable nozzles for a turntable for an electron-beam welding unit.
Application of electron beam welding as an alternative approach for connecting pipelines in oil and gas equipment
Authors: Cherepanov A I , Kravcova E G , Kukartsev V V , Kuznetsov A V , Minkin A N , Rogova D V 
Published: November 2021

Abstract
The article discusses electron beam welding for connecting pipelines. This approach has been reviewed in the literature. The technology of creating flange connections in the oil and gas industry is considered. The analysis and selection of the most suitable equipment for the creation of permanent joints of complex structures has been carried out. Thus, a literature-patent review of the current state and methods of using electron beam welding for various designs and control methods has been carried out. The analysis of the subject area showed that there is equipment, in particular, the TETA 6E400 installation and a turntable for creating such connections in the area under consideration. The proposed approach will improve the quality of flange-pipeline welded joints and reduce the cost.
Development of the design and justification of the parameters of the guide rapier of the weaving machine
Authors: Djuraev A , Madrakhimov Sh , Erkinov M 
Published: November 2021

Abstract
The article describes the design feature and the principle of operation of the recommended pattern of the weaving rapier guide. On the basis of theoretical studies, graphical dependencies of the parameters of the guide roller were adjusted, the system parameters were recommended by analyzes.
Research of the drawing of bars plate in the refiners
Authors: Vikharev S N , Morkovin VA 
Published: November 2021

Abstract
Object of research of article is the drawing of bars plate in the refiners at refining of chips and wood pulp. On the basis of the theory of contact interaction of bars influence of the drawing of plate on characteristics of contact processes is investigated. The friction coefficient between plate decreases at increase in density of contact of bars. At increase in an angle of crossing of bars rotor and stator and refining of pulp with concentration up to 6% the coefficient of friction decreases. At increase in an angle of crossing of bars chips and pulp with concentration over 10% the coefficient of friction increases. Therefore it is recommended to increase the angle of crossing of bars rotor and stator at refining of pulp of low concentration, and at refining of pulp of concentration over 10% and chips - to reduce, up to a radial arrangement.
Investigation of localization accuracy in UWB relative ranging system
Authors: Krasnov Timur V 
Published: November 2021

Abstract
The hybrid combination of a traditional positioning system with fixed reference points and a relative positioning system based on the relative position of network subscribers on the basis of measuring the distances between them increases the availability of the positioning system for moving objects in harsh environment and the accuracy of their positioning. Depending on the operating conditions, the cascade measurement of the distances between the nodes expands the working area with an acceptable positioning accuracy with the same number of fixed anchors.
Theoretical justification for the development of computer model of MDF structure and its milling process
Authors: Efimova T V , Ischenko T L 
Published: November 2021

Abstract
The main parameter for determination of quality of MDF boardprocessing after milling is roughness of the surface. The well-known models of wood cutting are unsuitable for the assessment of this parameter, since they make it possible to draw only qualitative conclusions about the roughness, they do not allow calculating the numerical value. To calculate the roughness value, the model must take into account the structure of the material and the main parameters affecting the roughness. The purpose of this work is to substantiate the development of a computer model of the MDF structure and the process of its milling using the finite element method. The implementation of this approach will allow, according to the specified parameters of the cutter and modes of its operation, to determine the quality and energy indicators of the milling process from a theoretical point of view. As a result of the work carried out, a detailed theoretical justification for the development of a computer model of MDF structure and the process of its milling was given. Its implementation makes it possible to determine the quality and energy parameters of the milling process according to the specified parameters of the cutter and its operating modes.
Simulation of the kinematics and gas dynamics of the centrifugal dispersion stand
Authors: Zverovshchikov A E , Bolshakov G S 
Published: November 2021

Abstract
The article studies the kinematics and gas dynamics of the centrifugal dispersion stand for spheroidizing hard alloy materials. When studying the process of centrifugal spraying on an experimental setup, it was found that the behavior of particles in the volume of the dispersion chamber is determined by the aerodynamics of gas flows formed in the working chamber. It is assumed that under the influence of gas flows, a spontaneous classification of the particles of the medium occurs, determined by the size of the latter. To study the trajectory of movement of particles of powder material in the working chamber and the deposition process, a gas-dynamic model of a centrifugal dispersion unit in the SolidWorks FlowSimulation application is proposed. The developed model of the centrifugal dispersion unit showed the possibility of operational analysis of the behavior of the gas flow, the trajectory of the particles of the powder material and the temperature of the obtained powder material, depending on the design and technological factors. The simulation results allow one to determine the principles of separation of a heterogeneous medium of particles into fractions, directly at the installation for the implementation of the method.
Computational methods based on fuzzy control algorithms for operational control and identification of control systems in smart production
Authors: Zolkin A L , Losev A N , Sychanina S N , Melnik T E , Buryakova O S 
Published: November 2021

Abstract
The problem of the functioning of complex technical systems is studied in this article. The authors consider the problem of structural and functional redundancy (the complexity of formalizing computational methods for dynamic and nonlinear systems used in modern industrial production). On the example of considering the structure of the climate control subsystem for a closed loop of an industrial unit, a fuzzy configurator model for controlling the operation of a refrigerator is formalized. It is reduced to: linearization of the reading of instantaneous temperatures from various loops of the considered control system, followed by fuzzification and antecedent analysis. Eventually this allows to implement a complex method of fuzzy control and calculation of structural redundancy in any configuration with a different probability ratio. The authors also raise the question of the comparability of the obtained data and application of the developed method as a tool for predictive analytics in technological processes of production management.
Investigation of the influence of the pattern of a disc mill set on the process of obtaining powdered pulp
Authors: Vasilyeva D Yu , Yurtaeva L V , Marchenko R A , Kaplyov E V , Zyryanov D E , Reshetova N S 
Published: November 2021

Abstract
On the market of pulp and paper products, new requests for more narrowly targeted products appear every year. To stay competitive in the market, manufacturers need to use not only traditional types of fibrous materials, but also use with excellent characteristics from the usual cellulose. The article discusses the role of the knife process of pulp grinding. A method for producing powdered cellulose with preliminary grinding in a disk mill is proposed. The paper-forming properties of the pulp and the degree of polymerization of powdered cellulose, depending on the degree of grinding, are given.
Temperature dependence of dynamic and static modulus of elasticity of lightweight expanded clay aggregate concrete
Authors: Medvedev M A , Cherkasov A M , Tararushkin E V 
Published: November 2021

Abstract
The paper presents experimental research the static and dynamic modulus of elasticity of lightweight expanded clay aggregate concrete with averaged density of 1000 kg/m3. The static and dynamic modulus are obtained depending on the influence of temperature in the range from 5 to 50 °C with a step of 15 °C. The dynamic modulus was determined without pre-compression with a testing machine Asphalt Mixture Performance Tester. Besides the modulus of elasticity of lightweight concrete, the temperature dependence of unconfined compressive strength was also determined. Analysis of experimental data showed that with an increase in temperature, strength and modulus of elasticity slightly decrease, which is typical for concretes. For all cases, the temperature dependence can be characterized according to the linear law. Comparison of the static and dynamic modulus of elasticity showed that the dynamic modulus is 60-74% greater than the static modulus over the entire range of the studied temperatures.
Research of the possibility of improving the traction and economic characteristics of a supersonic passenger aircraft engine through minimal modifications to the high-pressure compressor
Authors: Strelets D Yu , Serebryansky S A , Shkurin M V 
Published: November 2021

Abstract
In this paper, the possibilities of improving the traction and economic characteristics of a by-pass turbojet engine of a high-speed passenger aircraft due to minimal modifications of the high-pressure compressor. A thermodynamic model of the investigated engine of a new design in a three-dimensional layout was formed using an automated multicriteria optimization process. A computational assessment of the change in the characteristics of compressor modifications is carried out based on a numerical model of gas dynamics.
On the subject of analyzing the post-buckling behavior of composite sandwich panels with thin skins of variable stiffness under longitudinal compression
Authors: Mitrofanov O V , Nazarov E V 
Published: November 2021

Abstract
The use of variable stiffness panels can be considered as one of the measures to improve the weight efficiency of aircraft structures. The object of research in this work is three-layer panels of variable stiffness loaded with longitudinal compressive forces. The purpose of the work is to evaluate the overcritical behavior of the specified panels when geometrically nonlinear relations are used. The variable parameter of three-layered panels in the case under consideration is the height of the rigid filler, which varies linearly. An analytical solution of the problem of determining the stress-strain state by the Bubnov-Galerkin method is given. The deflection of a panel is represented by two terms, and the problem is reduced to the solution of a nonlinear system of two unknown equations with respect to the values of the deflection amplitudes. Analytical expressions for calculating membrane stresses are given. The practical significance of the work lies in the possibility of estimating the overcritical behavior of a three-layer panel of variable stiffness under compression and the possibility of constructing an algorithm for the optimal design of the panels.
Computer application of the kinematics control system for a virtual stretch-tightening press RO-630-11
Authors: Mikheev V A , Alvarenga Roberto de , Demidova M M 
Published: November 2021

Abstract
A computer application of the control system for the virtual display of a real stretch-tightening press RO-630-11, taking into account its kinematic features, has been developed. The focus is on the research carried out by the finite element method in modeling the processes of shaping a sheet blank by a tightening punch, with a surface oriented relative to the curvature lines and placed on the table of a virtual stretch-tightening press RO-630-11.
Influence of the circumferential speed of the spiked cylinders on the efficiency of cleaning raw cotton
Authors: Rajabov Ozod , Salimov Shukhrat , Temirov Azamat , Yokubov Mukhriddin 
Published: November 2021

Abstract
The article examines the dependence of the speed of rotation of the spiked cylinder of the machine for cleaning the raw cotton from fine impurities on the cleaning efficiency of the machine by different varieties. In addition, the article plotted the speed of rotation of the spiked cylinder as a function of mechanical damage to the seed. Based on experimental studies, the operation of the machine for cleaning cotton raw materials from fine contaminants is based. Experimental studies on raw cotton of medium and fine fiber varieties of hand and machine cotton picking on the value of constant and differentiated peripheral speeds of cylinders fully confirmed the theoretical conclusions. It is recommended to use a differentiated high-speed mode of rotation of the spiked cylinders: When cleaning medium-staple cotton - 10:11:12 m/sec, when cleaning fine-stapled cotton - 9:10:11 m/sec.
Abrasive resistance of polyetherurethane ureas
Authors: Senichev V Yu , Pogorel’tsev E V 
Published: November 2021

Abstract
The relationship between the structure of the polymer chains and the abrasion resistance of segmented polyurethane ureas based on polyoxytetramethylene oligoether was studied. Experimental data were obtained for systems with the hard segments content above 39%. It was found that the function of the volumetric wear of polyurethane-urea samples on the content of hard segments had an extremum; at high contents of these segments (more than 35%), a further increase in this content lead to a deterioration in the abrasion resistance. The reasons for this effect can be associated with a sharp deterioration in the strength and strain properties of the studied elastomers when additional amounts of diisocyanate are introduced into the system, which can lead to the formation of excessive interchain bonds.
Performance improvement methods of hydroficated machine under refrigeration
Authors: Kaverzina A S , Lunev A S , Karnaukhov I V , Pankiv M D , Andreychikov I V 
Published: November 2021

Abstract
In this paper, the problem of the influence of climatic conditions on the performance of a Hydraulic gear is considered. The importance of the work is due to the fact that the methods for solving the problem are proposed, namely, the use of preheating for a Hydraulic gear and an internal combustion engine under refrigeration. The use of hydrofected self-propelled vehicles in the northern regions in winter is considered. The factors determining the technical and economic indicators of hydrofected machines are revealed. The influence of negative temperature on the physical and mechanical properties of hydraulic equipment materials is also considered. Three main directions have been identified in which temperature affects the hydraulic drive. An experiment was conducted in which the dependence of the performance of the machine was revealed using a preheating device for the working fluid and without the device.
Methods to improve hackles in the production of quality yarn
Authors: Kazakov Farxot , Rajabov Izzatulla , Umirov Jamshidjon , Ruziyeva Dilafruz , Aripova Aziza 
Published: November 2021

Abstract
The article covers the analysis of work members and mechanisms of hackles, substantiation of technical parameters and modes of operation in order to improve the quality of yarn, to eliminate thread irregularities, to reduce thread breakage and defects by changing the hackling segments and supply table spacing. The work members of the hackles, the traction forces of the roving and the hackle, as well as the productivity of the machine are theoretically determined. The hackling level indicates the thickness of the fiber layer on the surface of the main drum, or how many fibers fit into a single headset tooth. By varying the spacing between the receiving drum and the supply table, the fibers are better hackled, the degree of hackling increases - the higher the quality of the hackle and the effect on the quality of the roving has been determined theoretically and experimentally.
Robotic wheel structures and their industrial applications based on motion simulations
Authors: Ordoñez-Avila José Luis , Magomedov I A , Bagov A M 
Published: November 2021

Abstract
The following work was done to analyze mobile structures with different arrangements of wheels. Software package Solidworks was utilized in modeling and analysis of the structures. Eight mobile structures were built by rearranging the placement of both driven and free wheels. Each structure has its own unique placement of wheels, hence giving the opportunity to understand the influence of the wheels’ placement on the functionality of the whole structure in terms of speed, stability, and other parameters. Therefore, eight mobile structures were analyzed, and the results were gathered. Adding more driven wheels or free wheels does not improve the performance of the mobile structures. The outcomes of the results illustrated that structure 6 tends to be more positive in terms of energy consumption, torque, and stability. Hence, adding more driven wheels does not improve the performance of the mobile structures.
Analysis of alternative motor-vehicle fuels
Authors: Kovaleva M A , Shram V G , Vinichenko T N , Kravtsova E G , Slashchinin D G , Matkerimov T Y 
Published: November 2021

Abstract
In this paper, the analysis of alternative fuels is carried out: electricity, hydrogen, biofuels (bioethanol, biodiesel, biogas), solar energy, compressed air, gas engine fuel (compressed natural gas, liquefied petroleum gas, liquefied natural gas). The advantages and disadvantages of their use are indicated according to the criteria of environmental safety, cost, and infrastructure development. It is revealed that at the moment, gas-engine fuel, in particular liquefied petroleum gas and compressed natural gas, is most suitable for the transfer of the fleet. The economic and environmental effect of the market expansion is associated with the high environmental friendliness of this type of fuel, low price, large natural reserves, the development of the petrochemical industry of the country, the reduction of financial costs for the repair and reconstruction of physically and morally outdated oil refining and liquid fuel production enterprises, promising technical and technological solutions to transport problems.
Automation of technological processes in the examination of core samples
Authors: Morev A V 
Published: November 2021

Abstract
Currently, there are quite serious problems in the methodology of conducting petrophysical studies. These problems have a significant impact on the process profitability of obtaining analysis results. Improving the efficiency of laboratory analyses is an important direction towards enhancement of the methodological approaches used in the laboratory practice. Automation of the process of recording the volume of water displaced from the chamber of a group capillarimeter while determining the water saturation of standard and full-size core samples is analyzed.