bluuebunny/crossref_metadata_2025_split huggingface dataset:
The study of the optical constants of BaYF5 and SrY2F8 films
Authors: Kotlikov E N , Lavrovskaya N P , Shifrin B F 
Published: May 2021

Abstract
Double fluoride films are used as low-refractive films in the mid-IR range of the spectrum. They have better moisture resistance and hardness then fluorides. Their using in the interference coatings requires knowledge of the optical constants of the films. The paper describes a spectrophotometric method for determining the optical constants of films with absorption based on the correction of the reflection and transmission spectra. The results of a study of optical constants also are presented in this paper: the refractive indices n and the extinction coefficients k of BaYF5 and SrY2F8 films in the spectral range of 1.5–16 µm.
Automation methodology of the surface creation of products thin-walled shell
Authors: Khotina Galina , Churakova Ekaterina 
Published: May 2021

Abstract
To succeed in the process of educational design, it is necessary to understand and formulate the principles that underlie the creative activity of students and are conditioned by the patterns of technique and technology development. In the process of educational design, opportunities arise for students to use their knowledge about the mechanical, physical, chemical, technological and operational properties of products for the manufacture of an educational design object, as well as for the application and improvement of their practical knowledge and skills. In this work, the authors set themselves the task of resolving the arising methodological disagreements in the process of teaching junior students solid-state modeling of the constituent parts of complex products. It has been established that before proceeding with the design of a unit, it is necessary to analyze it, select individual surface areas and outline methods for their construction, including the construction of complete sketches of individual elements.
Transverse bending of waveguide by gravity load
Authors: Kudryavtsev I V , Brungardt M V , Kudryavtseva Yu , Kolotov A V , Rabetskaya O I 
Published: May 2021

Abstract
The paper considers the problem of gravitational loading of an extended thin-walled structure of a waveguide with a rectangular cross-section. The waveguide is modeled by a composite structure of 4 plates. The solution was based on the theory of plates and shells for each plate constituting the cross-section of the waveguide. The analytical solution is based on 5th-degree polynomials using the Airy function and the Saint Venant semi-inverse method. Calculations according to the proposed method were compared with data obtained according to beam theory. The comparison confirmed the correctness of the technique and showed that the proposed solution predicts large values of maximum stresses and deformations by 10-14% due to taking into account the fineness of the structure. Also, the proposed approach revealed tangent stresses at the angles of the rectangular cross-section, which arise due to the inhomogeneity of deformation of the elements of this cross-section.
Review of missing values procession methods in time series data
Authors: Petrusevich D A 
Published: May 2021

Abstract
Missing values is common problem for a lot of time series. Lack of data can be caused with human factor, technical problems non-working measuring stations and so on. Usual methods of handling missing values in time series data suppose that there are models of time series that can make predictions at period one needs to describe. To build them it’s necessary to have data of some time lapse before the period under investigation. Inside of this set of data there shouldn’t be any missing values. So, ordinary approach supposes that there’s a lot of data before the period under question. In this research it’s supposed that missing values can be situated in time series data at any time point. Thus, there’s no whole uninterrupted segment of time series that can be used to train models. Missing values in these time series must be handled first and only after that it’s possible to construct time series mathematical models and make forecasts. At this stage one can evaluate quality of constructed models and whether handled missing values fit known data.
Approximation of the filtration flow curve through the layers of sorbents and ionites in petrochemical and environmental mass transfer equipment
Authors: Merentsov N A , Balashov V A , Golovanchikov A B , Topilin M V , Persidskiy A V 
Published: May 2021

Abstract
A modified equation is presented for approximating experimental filtration flow curves through layers of sorbents and ionites in petrochemical and environmental mass transfer equipment, which makes it possible to decipher the contribution of the increasing inertial component of the filtration flow structure and to estimate the intensity of the upgrowth of filtration flow turbulence. The prospects of using the modified equation for solving spatial filtration problems are shown, since it ensures the continuity of the velocity fields and pressure gradients with successive changes in the filtration flow mode.
Implementation of the greening process at oil and gas industry enterprises
Authors: Yakovlev V A , Berezhnov D A 
Published: May 2021

Abstract
This article provides an analysis of the main problems that affect the greening of products and their marketing systems, and considers international norms, rules and environmental standards in the field of marine fuel use. The effective solution of the problem and the development of related areas of improvement of the system of introduction of greening of fuel products and its further marketing, including external, information, technological and structural components, are proposed. The development of the market for the sale of liquefied natural gas, research on the creation of fuel with a reduced sulfur content, strengthening quality control in the organizational mechanism for the sale of finished products, as well as increasing the level of greening during transshipment, transportation and bunkering are considered as directions for implementing the goal of greening.
Management of metrological examination processes based on a risk-oriented approach
Authors: Simkin A Z , Mozhaeva T P , Proskurin A S 
Published: May 2021

Abstract
The paper describes the basics of managing metrological examination processes in the quality management system of an enterprise based on a risk-oriented approach in the interpretation of international standards ISO 9000:2015. A procedure for identifying and structuring the risks of metrological examination processes is proposed based on the modular-hierarchical model of the enterprise quality management system, which is connected with defining the category of the process under study and correlating its parameters with the risk characteristics. The arguments are given to prove the advantages of using the procedure for managing the metrological examination processes in the quality management system of an enterprise based on a risk-oriented approach.
High performance computers: from parallel computing to quantum computers and biocomputers
Authors: Yerlanova G , Serik M , Kopyltsov A 
Published: May 2021

Abstract
Various programming methods are considered. Particular attention is paid to parallel programming, quantum computers and biocomputers. This attention is due to the fact that in recent years, high-performance computing has been intensively developing. One of the main ideas for increasing the speed of information processing is to carry out calculations in parallel. For classical programming methods this is achieved thanks to the advent of multiprocessor computers. Such computers allow computational tasks to be parallelized by introducing parallelization elements into classical programming languages. Another approach to speed up computation is based on the idea of a quantum computer. The use of qubits in quantum computers leads to the fact that all possible states of the system are simultaneously processed. Another approach leading to increased computing performance is based on the development of biocomputers. This approach is based on the idea of using DNA chains consisting of a sequence of four nitrogenous bases (adenine, guanine, thymine, and cytosine). The information is stored and processed as a sequence of these nitrogenous bases. An increase in the speed of calculations is carried out due to the fact that biochemical reactions can take place simultaneously on different parts of the DNA - chains.
Methods for monitoring metrological characteristics of scientific and physical parameters of intelligent sensors in real operating conditions
Authors: Matyakubova Parahat M , Masharipov Shodlik M , Ruzmatov Kakhramon R , Sultanov Murodjon K 
Published: May 2021

Abstract
Intelligent sensors - the direction of studying the characteristics of scientific and physical parameters in real conditions (in the regions of Uzbekistan at the Aral Sea). This article provides brief information on monitoring methods using software, an analysis of the physical activity of various sensors in an area of over 220 hectares given in the Khorezm region. Creating a common relationship between humanity and the environment with the support of information technologies.
Assessment of overall equipment effectiveness according to OEE methodology
Authors: Mitsel A A , Grirorieva M V , Yu Dunaeva T 
Published: May 2021

Abstract
The article discusses the Overall Equipment Effectiveness indicator, the parameters of which are Availability, Performance and Quality are random variables. Mathematical models are described for calculating the probability density of a random value of Overall Equipment Effectiveness, which characterizes the efficiency of equipment use. The relevance of the study is due to the relevance of methods for assessing the effectiveness of equipment and improving production processes in industrial enterprises.
Study and analysis of the influence of stresses arising in a damaged thin-walled cylindrical container during compression
Authors: Antypas I R 
Published: May 2021

Abstract
The subject of the article is important today; it is concerned with study of the effect of stresses, which occur in thin-walled cylindrical containers, such as tanks of fuel-servicing trucks, tankers, railroad tankers, and other containers operated under pressure, which are utilized in various sectors of the national economy. The goal of the undertaken researches is study and analysis of the effect of stresses, which occur in a thin-walled cylindrical container as a result of an inclined dent. Test results showed that during study of the effect of stresses, which occur in the damaged area of a thin-walled cylindrical container, it was discovered that their values depend on the angle of the dent’s edge with respect to the container. Moreover, stresses in the damaged area decrease with an increase of the angle and maximum values occur when axes of a dent’s edge and container are parallel with each other. Timely maintenance by applying metal bands to the damaged area greatly decrease stresses, especially if rhomboid bands are used.
Research of sliding bearings with reverse friction pair and inlaid liners made of thermoplastic composite materials
Authors: Rogovskii I L , Titova L L , Yu Remshev E , Solomka O V , Voinash S A , Malikov V N , Olehver A I 
Published: May 2021

Abstract
In the article the authors reveal technical solutions to increase the efficiency of inverted plain bearings with typesetting inserts made of thermoplastic composite materials by determining their rational parameters. The working hypothesis of the research was the postulate that the efficiency of composite polymeric materials is determined not only by high physical and mechanical and other properties, but also by the rational design of the friction unit. In the article, the authors proposed the developed experimental design of the inverted plain bearing, which differs from the existing ones in that the plastic inserts of the plain bearing are made in the form of prisms with a rectangular cross section, one side of which is an arc. The authors present analytical dependences that allow to determine the load that is perceived by the most loaded liners under the simplest load condition and a purely radial load applied to a radial bearing having a contact angle. The article reveals the results of laboratory tests and found that the total linear wear of the bearings of the sliding bearing in the form of inverted friction pair at 100 hours of continuous operation in a grease environment is 20…25% less than the bearing in the form of direct friction pair.
Carrier phase difference measurement method for GNSS-simulator navigation signal
Authors: Frolov A A , Yu Burtsev S , Pecheritsa D S 
Published: May 2021

Abstract
A method for measuring phase difference of carrier frequency of GNSS-simulator navigation signal, based on the use of a multichannel analogue-to-digital converter and phase processing at intervals of its linear change is proposed. The developed method makes it possible to measure the phase difference of carrier frequency of radio navigation signal with a non-excluded systematic error 1.5°.
Improvement of the drawing process on the shopfloor taking into account simulation in industry 4.0
Authors: Khaimovich I N , Chaeva S U 
Published: May 2021

Abstract
The article analyzes the production process and equipment for producing FLRY-25-C wire; simulation experiments were carried out in AnyLogic, which allow assessing the effect of changing various system parameters on the output of the final product. The author identified a number of problems in the production cycle of manufacturing wire FLRY-25-C and proposed measures to improve the efficiency of this process. As a result, it was found that the implementation of the proposed measures helps to reduce the duration of the production cycle for the wire manufacture by 68 hours, respectively and to increase the productivity of the process by 40%.
Study of the machine unit of the saw gin seed-retracting device
Authors: Mukhammadiev D M , Akhmedov Kh A , Kh Abzoirov O , Mallaev O S , Esanova N B 
Published: May 2021

Abstract
The article provides the results of research on the machine unit of the seed-retracting device of the saw gin. The equations of motion of the machine unit of the seed-retracting device of the saw gin were derived and the moments of inertia of the electric motor and the seed-retracting device were experimentally determined. As a result of research, the critical values of the driving moment of an electric motor (according to the characteristics of M.M. Sokolov and others) and the angular acceleration of the saw cylinder and the time of the transient process were stated. It was determined that the maximum value of the angular velocity of the seed-retracting device reaches 53.191 rad/s at t=2.061 s, delaying the electric motor velocity by 0.4 s, since the maximum value of the angular velocity of the electric motor reaches 130.598 rad/s at t=1.605 s.
To the solution of some problems of roller pressing of sheet materials
Authors: Musirov M U , Buriyev E S 
Published: May 2021

Abstract
The article is devoted to solving one of the basic hydraulic problems of the theory of roller pressing of sheet materials. Analytical dependencies are obtained that describe the distribution patterns of hydraulic pressure during roller squeezing of sheet materials. The analysis of the calculations showed that the obtained patterns of changes in hydraulic pressure are consistent with the theoretical conclusions and experimental diagrams obtained by other researchers.
Optimization of calculating operations in designing of mechanical drives
Authors: Savostina T P , Dyachenko A G 
Published: May 2021

Abstract
The present article is concerned with optimization of calculation of project design work in the context of determining the optimal structural weight. As an example, the article considers a mechanical double-reduction drive. Using the condition of minimum total center distance, the kinematic diagram of a double-reduction cylindrical reducer was optimized, with consideration of the effect of bending fatigue strength of teeth. In addition, optimal gear ratios were obtained in Excel.
Assessment of the influence of deviations in the shape of the surface of the part on the measurement error
Authors: Zh Shkaruba N , Leonov O A , Grinchenko L A 
Published: May 2021

Abstract
The analysis of the factors influencing the occurrence of errors when measuring linear dimensions by universal measuring instruments have carried out. It has shown that for linear measurements, the errors of measuring instruments are in most cases the main components that have a dominant effect on the total measurement error. The specific components of the measurement error at the stage of defective detection of parts during machine repair have considered. For the analytical representation of the current size, a polar coordinate system has introduced and an equation for the contour of the cross section of the measured part has drawn up. To quantify the error caused by not detecting the smallest diameter of the part, an error formula has derived for the oval profile of the part. The estimation of the influence of the number of measurement directions during fault detection on the value of the measurement error has been carried out. Recommendations have presented to reduce the measurement error associated with the deviation of the geometric shape.
Calculation of the upper beam bending of a saw gin
Authors: Mukhammadiev D M , Akhmedov Kh A , Ergashev I O , Yu Zhamolova L , Abdugaffarov Kh J 
Published: May 2021

Abstract
The article presents the data of studies of the upper beam deflection of a saw gin. The displacement-based finite element method can be used to calculate the upper beam bending of a saw gin with variable thickness. It was determined that under the maximum load of 3004.43 N/m on the upper beam of the saw gin, the deflection reached 10.2 mm at L=1.327 m. Therefore, to reduce the deflection of the upper beam, it is necessary to increase the moment of inertia by changing its cross-section. To do this, it is necessary to create a new design of the upper beam of a saw gin, providing the greater value of the moment of inertia than I=2.19-105 m4
Investigation of the free expansion of thin-walled tubular parts by pulsed-magnetic field
Authors: Kurlaev N V , Ryngach N A , Tagoev F M , Ahmed Soliman M E 
Published: May 2021

Abstract
Magnetic-pulse processing is the process of converting the preliminarily accumulated electrical energy of the capacitor into the plastic deformation work of the workpiece. The technological processes of magnetic-pulse processing have complex electromechanical nature and also associated with high strain rates. These process parameters are difficult to determine experimentally, so it is proposed to perform and analyze them through numerical modeling. This article presents a study of the expansion rate of a tubular workpiece and its effective plastic deformation by pulsed- magnetic field. The influence of process parameters on free tube expansion is discussed in detail. The results were obtained through 3D finite element modeling, using the ANSYS software. The development of such a finite element modeling model makes it possible to exclude the conduct of experimental studies to detect the magnetic-field and the velocities, which are involved in the process. Numerical research makes it possible to determine the optimal value of the pulsed-magnetic field pressure for free expansion of tubular parts.
Analysis of model for assessing the road train movement stability
Authors: Stroganov Yu N , Belov V V , Belova N N , Maksimov A N , Ognev O G 
Published: May 2021

Abstract
In this paper, we conduct a mathematical analysis of the model of ensuring the road trains movement stability by changing the design of coupling devices to determine the critical characteristic parameters of the road trains, which result in the loss of en-route directional stability under external action. The concept of the model was to separate the process of yawing of the road trains and its elements (due to external perturbing action) on the highway into several typical stages. The main parameters of the stages (the displacement amplitude and rotation angle of the road trains elements in relation to the driving direction) were determined based on the initial conditions of the road trains movement, the force and duration of the external action. The most dangerous areas of external action application to the road trains were determined in this paper. The maximum permissible exposure limit should not exceed 0.5–1.0% of the road trains trailer momentum, with duration having the greater effect than the amount of impact. The results obtained can be used in mechanical engineering to improve the road trains performance.
Static and dynamic approaches in industrial metrology in the framework of measuring enterprise productivity
Authors: Ganshina E Y 
Published: May 2021

Abstract
Workforce productivity measurement is a key metric at the evaluation of the operational efficiency for any industrial enterprise. The relevance of measuring the operational efficiency horizon - static or dynamic approaches in industrial metrology - is due to the need to ensure long-term sustainable development. Accelerating workflow and innovation is redefining performance measurements by offering new sources of productivity gains. The reduction in personnel becomes economically due to the reduction in downtime. Such innovations are especially effective when considering static performance metrics. At the same time, a dynamic approach that does not provide for staff reduction, but aimed at reducing the labor costs of each individual employee, no less positively affects productivity metrology, while laying a more stable, long-term trend for maintaining and increasing the achieved indicators.
Selection of the circumferential speed of the spiked cylinders of cotton cleaners - raw from small trash
Authors: Rajabov O I , Kurbonov F A , Abrorov A S , Gafurova M Z 
Published: May 2021

Abstract
This article presents the materials of the theoretical analysis of the working bodies of the machine for cleaning cotton raw materials from small trash. And also the influence of the speed of rotation of the peel cylinder of the cleaner on the separation of small trash from raw cotton was studied. It has been proven that a differential increase in the speed of the spiked will lead to an increase in the cleaning efficiency of the machines. It is recommended that the speed of the first cylinder be 10 m / s, the speed of the second cylinder 11 m / s, the speed of the third cylinder 12 m / s, etc.