bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of e-learning resources for distance learning in the field of radio engineering
Authors: Galkina A I , Grishan I A , Kleynosova N P , Orehvo D O , Khrunichev R V 
Published: December 2022

Abstract
The article presents the analysis of the results of electronic educational resources development in the field of “Radio Engineering”, registered by the authors of Ryazan State Radio Engineering University after V.F. Utkin in the United Foundation of Electronic Resources «Science and Education». Under epidemic constraints, the higher education system is faced with the need to provide distance or blended learning, with no loss of quality. The basis of distance learning consists of electronic educational resources of different formats, which allow providing information interaction of all participants of the educational process: students, teachers, administration. The object of research is electronic educational resources. The subject of the study is electronic educational resources in the field of radio engineering, developed at Ryazan State Radio Engineering University. The research methods are statistical, logical and semantic analysis methods. The information on electronic resources is selected from the database of the United Fund of Electronic Resources «Science and Education» for the period from 2019 to 2021. Statistical processing of database records is automated, carried out with the help of software developed by the specialists of the “Science and Education” pool of electronic resources.
Numerical simulation of a flat turbulent near-wall jet in the OpenFOAMv7 package
Authors: Kurbanaliev A Y , Abdimutalipova Z K , Aknazarova S S , Erkin Abdinabi uulu , Suyumkan Myktarbek kyzy 
Published: December 2022

Abstract
In this research, the numerical simulation of a planar stationary near-wall turbulent jet using the OpenFOAMv7 package at Reynolds number, Re, equal to 9600 has been performed. Comparison of numerical results with corresponding experimental data on longitudinal velocity profiles shows the adequacy of the used mathematical model of the problem under consideration. This model should be used in further studies of turbulent jet flows.
The specifics of teaching bachelors and masters in the field of applied physics and metrology
Authors: Yakovlev Valeriy A , Zakharova Diana V 
Published: December 2022

Abstract
At the official level, the profession of “Metrologist” appeared only a few decades ago. However, even now there is no doubt that this profession has a huge impact on the daily life of a person. The thing is that metrology one way or another affects most of the areas of human activity. The most common ruler, which every person is used to using on a daily basis, is also the result of the work of a metrologist. At the same time, it is quite difficult to find a metrologist specialist in the modern world, since not every person dares to get such a specialty. Although there is no doubt that metrologists are popular. And they have great career prospects! An engineer is a leading position, therefore this specialist is always familiar with the basic norms and rules of labor protection, as well as the basic provisions of the Labor Code of the Russian Federation. Within the framework of this article, the main features of a narrow profile specialization will be considered in more detail.
MOOC in physics as an additional resource for the fundamental training of would-be engineers
Authors: Liksina E V , Vagaeva O A , Galimullina N M , Efremkina I N , Dianova Y A 
Published: December 2022

Abstract
Physics is one of the key disciplines stipulated by the curricular of engineering majors. Despite a sufficient amount of academic hours dedicated to this discipline at schools and universities, it is necessary to expand the opportunities for applying additional learning tools, autonomous studies of the most important areas of physics. One of such tools is mass open online courses (MOOCs). The article analyzes open online courses in physics provided by foreign (Coursera and EdX) and Russian (Open Education and Stepik) platforms. The criteria for analysis were the courses duration, the required level of training, the scope and content, as well as the features of pedagogical design of the courses. The demand for courses (number of learners), the universities developing them and the language of teaching were also taken into account.
Comparison of the energy efficiency of weather onboard radars of the X and Ku ranges with electronic scanning
Authors: Ryzhikov M B , Novikova Yu A 
Published: December 2022

Abstract
This work contains a comparison methodology and the resulting mathematical ratio, which can be used to compare the power of signals reflected from range cells with a certain water content. It is assumed that there is an electromagnetic wave attenuation between the radar and the range cell on the signal propagation path, which depends on the wavelength and weather conditions. Simulation results are presented that allow us to recommend the use of Ku-band radars in light precipitation on short-range aircraft.
Effect of wind load on waveguide strength
Authors: Brungardt M V , Brungardt A V , Goncharova E A , Li O A 
Published: December 2022

Abstract
The article considers the features of the influence of wind load in the Arctic and Far North regions on the static and dynamic state of direct waveguides. Waveguides have a thin-walled design with restrictions on wall deflections, so the theory of plates and shells is used to calculate them. In the static state, the wind load is modeled by uniform pressure on one side of the waveguide. This made it possible to obtain an analytical solution to the problem by the plate theory, identify the features of the stress distribution over the waveguide structure, and clarify the solution compared to the beam theory. Comparing the results of the calculation according to the proposed method with the results of beam theory showed good convergence. The dynamic state was estimated by the first natural frequency of waveguides, considering ice deposits. The results of the calculations showed a significant impact of ice deposits on the frequency of oscillations and showed the need for deicing.
Stationary stress-strain state of a three-layer viscoelastic cylindrical shell under normal loading
Authors: Kuldashov N U , Marasulov A M , Yunusov G G , Sh Ruzimov A , Hojiev T S 
Published: December 2022

Abstract
Multilayer viscoelastic cylindrical shells have found their wide application in construction, mechanical engineering, aircraft and rocket engineering. The aim of the work is to investigation the reaction of an infinitely long three-layer cylindrical shell to the action of a normal load moving along an axis with a constant to resonant velocity. The paper presents a mathematical formulation of the problem, developed solution methods and obtained numerical results for the problems of stationary deformation of an infinitely long three-layered cylindrical shell under normal loading. The equations of motion of the bearing layers satisfy the Kirchhoff-Love hypotheses. The solution methods are based on the joint application of the integral Fourier transform in the axial coordinate and the decomposition of all given and desired quantities into Fourier series in the angular coordinate. The outer and inner shells satisfy the Kirchhoff-Love hypotheses. The Lame viscoelasticity equation is used as a linear equation of the filler motion. An effective algorithm for solving the problem of osculations of a three-layer viscoelastic cylindrical shell under normal loading has been developed on a computer. Critical velocities of wave propagation in a three-layer shell under the influence of moving loads are found.
Temperature influence on elastic-hydrodynamic interaction of rolling bodies in roller bearing
Authors: Kudryavtsev I V , Ivanov V A , Mityaev A E , Kolotov A V , Rabetskaya O I 
Published: December 2022

Abstract
The lubricating layer located between the rolling bodies plays a crucial role in ensuring the service life of the bearings. Calculating the contact of rolling bodies with each other taking into account their compliance and lubrication parameters is a complex elastic-hydrodynamic problem, for the solution of which complex computer programs are usually used. The paper proposes a hybrid approach based on a separate solution of elastic and hydrodynamic problems with subsequent coordination of the complete solution. The semi-analytical approach of the created method allows solving a large range of problems, and was used in this work to assess the effect of temperature on the stress state of rolling bodies in a roller bearing. The results of calculations show the operability of the procedure and made it possible to establish the dependence of contact stresses on oil viscosity and temperature. The proposed approach is applicable for solving elastic-hydrodynamic problems for any bearings.
Definition of limit state of flexible pipe material in coiled tubing technology
Authors: Dzhuraev R F , Naumkin E A , Kuzeev I R 
Published: December 2022

Abstract
Currently, the use of coiled tubing technologies has become widespread in drilling and oil production. The flexible pipes (FP) used in this technology undergo a complex of several impacts that accelerate the process of damage accumulation and thereby cause an accelerated process of seats of destruction formation, which often leads to accidents. Statistics show that the main reason for the destruction of the FP is the fatigue of the material loading and basically it is a cyclic bending according to the repeating stress cycle scheme. This loading scheme has a feature that is associated with the fact that tensile loads occur mainly in the convex zone of the pipe and compressive loads in the concave zone. Since the physical and mechanical properties of steels under stretch and compression are different, the process of damage and destruction accumulation during cyclic stretch and cyclic compression will have a different character. Information about the patterns of changes in the properties of the FP material allows to estimate the period of reaching the limit state and, thereby, prevent accidental destruction. In this regard, fatigue tests were carried out with a step-by-step measurement of magnetic characteristics that are structurally sensitive to the accumulation of fatigue damage. The determination of the stress amplitude for the FP fragment was determined by preliminary calculation in the ABAQUS PC. The test results showed that during cyclic stretch of the samples, the magnetic characteristics for assessing the limit state in the FP material were not informative. Notably in samples loaded with cyclic compression, the results of magnetic characteristics measuring (the resulting intensity and the gradient of the intensity of the constant magnetic field) showed sensitivity to the onset of the limit state. Based on the conducted studies, it is proposed to control the limit state of FP in the concave zone, where compressive loads mainly occur. These measurements allow us to estimate the value of the residual life of the FP material and to put this object out of operation in a timely manner, preventing accidental destruction.
On the propagation of intrinsic viscoelastic waves in a cylindrical shell
Authors: Sh Usmanov B , Safarov I I , Kh Teshaev M , Umarov A O , Kurbonova X 
Published: December 2022

Abstract
The article illustrates that viscoelastic wave in an extended cylindrical shell of circular cross-section. To solve boundary value problems used classical methods of mathematical physics. The unwavering quality of the comes about of the work is guaranteed by the rightness of the detailing of issues, the utilize of the classical device of scientific material science and other demonstrated strategies for tackling issues of wave engendering, the consistent legitimacy of the conclusions and the great assentation of the comes about with the uncommon cases known from the references.
Ensuring the unity of measurements of the neutron radiation rate absorbed dose in the field of clinical neutron radiation dosimetry
Authors: Fedorov S G , Berlyand A V , Dyachenko V M 
Published: December 2022

Abstract
Development of neutron radiation therapy arises the question of ensuring the uniformity of measurements of the absorbed dose and the absorbed dose rate of neutron radiation. FGUP “VNIIFTRI” improved the primary method and means of reproducing the unit of neutron radiation absorbed dose rate within the framework of improving the State primary standard of units of absorbed dose rate and neutron dose equivalent rate GET 117-2010. A set of ionization chambers has been created and the upper value of the reproduction of the unit of absorbed dose rate of neutron radiation has been expanded. A hardware-methodical complex has also been developed for transferring a unit of absorbed dose rate of neutron radiation to nuclear physics facilities used in neutron radiation therapy. As a result the expanded relative uncertainty of reproduction of the unit of absorbed dose rate does not exceed 3%, the expanded relative uncertainty of the transmission method does not exceed 0.5%. The resulting level of accuracy is in line with the recommendations used in neutron beam therapy.
Experimental studies of the dynamics of the proposed design of the presser foot with an additional conical spring
Authors: Mavlonova Iroda , Akhmetjanov Mansur , Vokhidova Munira , Fayziev Sirojiddin , Shokirova Sayyidaposhsho 
Published: December 2022

Abstract
This article is devoted to light industry equipment, namely sewing machines that are utilized in the manufacture of clothing, footwear and knitwear. The disadvantage of this design is the lack of vibration damping of the trigger and rod caused by changes in the thickness and structure of the sewing material, the impact resistance of iron and the incompatibility of the rotating elements in the sewing machine.
Oscillations of the outer bush of composite roller of the thread guide in the sewing machine
Authors: Tursunova G , Djuraev A , Ganchini Sh , Mansuri D , Mansurova M 
Published: December 2022

Abstract
The diagram of thread guide with composite rollers in a sewing machine is given in the article. Based on solving the problem of oscillations of the outer bush of the compound roller of the thread guide, the dependence of changes in the amplitude of deformation values of cushioning bush has been obtained. Values of stiffness coefficient of cushioning bush of compound roller have been substantiated.
On the steady-state motion in the vertical plane of an airship of the classical scheme
Authors: Grumondz V T , Osipova V A 
Published: December 2022

Abstract
We consider the construction of the mathematical model of motion in the vertical plane of an airship of the classical scheme and algorithms for calculating the parameters of its steady-state motion in various cases. The motion of an airship of rather small volume, for example, a remotely piloted airship, is investigated. Some types of possible motions in the vertical plane satisfying the proposed system of equations of steady-state motions are described. Such motions include horizontal flight with constant velocity, rectilinear flight in climbing mode, and descent at a constant trajectory slope angle. The cases of rectilinear flight of an airship along inclined trajectories, the inclination angle of which is not small, taking into account the nonlinear components of the aerodynamic characteristics, are also considered. We have developed algorithms for calculating the steady-state motions of an airship for various cases of flight along inclined trajectories corresponding to various methods of takeoff and landing of an airship without a special cable landing system. This allows us to construct trajectories that provide short takeoff distances and low landing speeds of the airship, which corresponds to the solution of the problem of safe operation of the airship as a technical system. The results of numerical calculations of steady-state motion parameters obtained in accordance with the constructed algorithms are presented. The calculation results are presented graphically.
Computer modelling of dynamics of the thread in technological process
Authors: Adizova Aziza , Abdieva Gulara , Mavlanov Tulkin 
Published: December 2022

Abstract
The article covers the technology of computer modeling of technological processes on example of the research of transverse oscillations of the thread in weaving process. During the formation of the fabric, various dynamic processes took place, including fluctuations in the threads. As an example, the longitudinal oscillations and tension of the threads in the process of surf on a loom are considered. The program and the results of the calculation are given using the software package “Mathcad”.
Methods for studying the properties, structure and composition of materials
Authors: Yakovlev Valeriy A , Berezhnov Danil A 
Published: December 2022

Abstract
To solve various practical problems, it is necessary to have information about the features of modern methods for obtaining and processing various materials, as well as the features of their rational use and properties. For example, it is necessary to collect information about the structural features and properties of materials and alloys, in particular, non-metallic materials, fuels and lubricants, as well as operating fluids considered in materials science. All this information can be extremely useful for the operation and subsequent repair of vehicles. As one of the key goals of materials science, one should consider the establishment of fundamental relationships between the composition, structure, and properties of various metals and alloys. It is noted that the solution of such a problem will require an extremely thorough study of the structural features of metals and alloys at the macro and micro levels. It is these features and data that will be given special attention in this article.
New diamond-like phases boron nitride TA-type
Authors: Ryashentsev D S , Burmistrov V A 
Published: December 2022

Abstract
A theoretical study of the structure and electronic properties of three new polymorphic varieties of diamond-like phases of boron nitride, the atoms of which are in equivalent crystallographic positions, was carried out by the density functional theory (DFT) method in the generalized gradient approximation (GGA). The primary structures of these phases were built modelically from the corresponding carbon diamond-like phases by replacing carbon atoms with alternating boron and nitrogen atoms, so that an atom of one kind was surrounded by atoms of another kind. As a result of the calculations, the possibility of stable existence of new structural varieties of boron nitride was established: BN-TA1, BN-TA2, BN-TA3. The sublimation energy of new BN phases varies from 17.08 to 17.59 eV(BN)−1. The new BN polymorphs are wide-gap semiconductors with a band gap at the Fermi energy level from 3.6925 to 5.4565 eV.
Effect of cutting parameters on temperature in the cutting zone in a high-speed steel turn-milling process
Authors: Matlygin Georgy , Savilov Andrey , Pyatykh Aleksey , Timofeev Sergey 
Published: December 2022

Abstract
The article aims to analyze the orthogonal milling method which can be applied in machining powder high-speed steels. To conduct the experiment, BÖHLER S390 MICROCLEAN HSS and carbide insert cutters were selected. A turning center with a driven tool was used. To examine the temperature in the cutting zone, a mathematical model of an orthogonal turn-milling process was developed and optimal cutting data were chosen using the results of simulation procedures. The model obtained can be used to analyze temperature changes in the cutting zone. The experiments determined the effect of the cutting parameters such as tool feed, speed and radial depth of cut on temperatures in the cutting zone.
Simulation of high-speed machining processes by multi-edge mills
Authors: Gordeev Yu I , Yasinsky V B , Spirin E A , Binchurov A S , Vakulin M S , Filippov S V 
Published: December 2022

Abstract
Based on the results of the numerical experiment by finite element analysis (FEA) the mill design having the initial tooth profile in the form of a trapezoid located along two intersecting spiral lines with angles of inclination of 14 and 71 degrees. As a result, about 70 cutting protrusions – are formed on the cylindrical surface, i.e., the total number of cutting edges in the cutting dynamics can be up to 280 blades. A model and methods for determining the geometric and kinematic parameters of cutting milling the required shape, dimensions and quality of the surface of the detail are proposed. The roughness at optimal cutting modes correspond to the Ra = 1.25-0.63 μm, which is comparable to grinding processing. The shape of individual chip elements can be described as spherical, its dimensions do not exceed 20 μm, and larger chip agglomerates have submicron and nanostructural fragmentation. Due to the increase of edges on the surface of new design mill increase the efficiency and intensity of deformation processes too (the number of single cutting cycles is up to 4000-6000 s-1). This is also in good agreement with the numerical estimates by the FEA method.
Development of technology for processing internal channels of small-sized parts based on computer modeling
Authors: Zverovshchikov Alexander , Gurin Pavel , Steshkin Artem , Mironychev Nikolay 
Published: December 2022

Abstract
In the manufacture of small-sized parts, the finishing of the internal channels of a complex cross-section with a coating is particularly difficult. To solve this problem, it is proposed to use centrifugal processing with steel balls in containers with planetary rotation. The paper presents the results of computer simulation of the contact interaction of balls with the surface of the part channel. These data made it possible to establish that at certain velocities and directions of the flight vector at the moment of contact, the balls allow you to remove the micro-roughness of the coating without violating the integrity of the part base. The simulation results formed the basis for the design of an industrial installation and the assignment of centrifugal-planetary processing modes. The proven technology of finishing the internal channels of small-sized details provided a reduction in the proportion of damaged parts by 4...4.3 times relative to the basic technological process.