bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-temperature tribological tests of composite materials
Authors: Roshchin M N 
Published: May 2020

Abstract
The work is devoted to high-temperature tribological tests of carbon-containing materials during friction on 40Kh13 steel in the temperature range of 20 - 800 ° C. The choice of test temperature is based on prospects of creating spacecraft drives for operation without lubrication in the atmosphere of Venus. The studies have shown that at the same load and temperature with increasing slip speed, the friction coefficient increases. With increasing load, the friction coefficient at a given temperature decreases. At a temperature of 300 ° C for speeds of 0.05; 0.16; 0.25; 0.3; 0.37 m / s with increasing load from 0.3 MPa to 1.0 MPa, the friction coefficient decreases by 1.4; 1.8; 1.1; 1.5; 1.5 times, respectively. At a temperature of 500 ° C in the same range of speeds and loads, the friction coefficient decreases by 1.1; 1.4; 1.5; 1.7; 1.6 times, respectively.
The life cycle assessment of the used rails according to the results of cyclic high-frequency tests
Authors: Loktev A , Fazilova Z , Gridasova E 
Published: May 2020

Abstract
The article presents the results of the strength tests and the metallographic studies of used rails with the significant running surface wear. On the basis of the accelerated modeling of the continuously welded rail life cycle, an assessment system is proposed to evaluate the life cycle of the used continuously welded rails that are sent to the rail repairing depots.
The construction of linear soil structures with the use of geosynthetic materials in the severe hydro geological conditions
Authors: Fazilova Z , Chizhikov I , Slepnev P 
Published: May 2020

Abstract
The article is devoted to the construction of the linear soil structure in complicated hydro geological conditions with the help of geosynthetic materials. This structure was proposed as an alternative to the applied extensive methods, such as the substitution of the roadbed soft soils for sand or rubble, or the installation of laying, characterized by high energy and material intensity, causing significant harm to the environment. The monitoring of the facility condition makes it possible to predict its high reliability and durability. The proposed structure and construction technology are described in the developed STO 80193846-007-2012 «The recommendations for the use of biopositive structures in complicated hydro geological conditions».
Development of the construction of overalls for oil workers with improved hygienic properties
Authors: Chorieva M M , Vafaeva Z S , Azimova M N , Gaybullaeva N N 
Published: May 2020

Abstract
This article focuses on improving the working conditions of oil and gas industry workers. Safe working conditions of workers working in the open space are largely determined by their provision with their high-quality workwear, which reliably protects from the effects of adverse climatic and production factors. The aim of the study is to develop rational workwear for oil workers in Uzbekistan. To achieve this goal, the following tasks were solved: - analysis of the working conditions of oil workers, existing workwear and the development of scientifically based requirements for the workwear being developed; - research and selection of a rational package of workwear materials. In the oil and gas industry, work is ongoing year-round, but the main work is carried out in a dry, hot climate. The special clothes given out usually to oil industry workers do not correspond to the conditions of their work and cause fair complaints. Therefore, the creation of rational special clothing for oil workers, taking into account the climatic conditions of this zone and the specifics of the oil and gas industry, is an important industrial task facing scientists and workers in the clothing industry.
Narrow-band optical filter for a spectral-selective control device of physical and physicochemical processes
Authors: Vaganov Mikhail A , Novikova Yuliana A 
Published: May 2020

Abstract
Subject of the present paper is the application of a multichannel optical spectrometer performing spectral measurements in specified areas of the optical range using a set of narrow-band interference optical filters that are tuned to certain wavelengths. Tasks of monitoring and controlling the physical and physico-chemical processes and the prospects of using non-contact optical spectroscopy for their solution are considered. Recommendations are given both on the choice of materials for infrared and visible filters. A visible range filter based on a combination of zirconium oxide and silicon oxide layers has been developed.
Radio links from low-orbit satellites
Authors: Samoylov A G , Samoylov S A , Nasir S A , Tahar I A Al 
Published: May 2020

Abstract
In this article, methods of transmitting the information from low-orbit satellites to the Earth are considered. Transferring the information from a low-orbit satellite to geostationary spacecraft at millimeter-wave frequencies that strongly attenuate in the atmosphere is proposed. The possibility of transmitting information from a low-orbit satellite transmitter with a power no more than 1–2 W and small-sized antenna arrays on the communication line is shown.
Theoretical simulation of quantum cascade lasers based on InGaAs/AlInAs and InGaAs/AlAsSb quantum wells
Authors: Romanova K A , Galyametdinov Y G 
Published: May 2020

Abstract
Quantum cascade lasers based on semiconductor InGaAs/AlInAs and InGaAs/AlAsSb quantum wells exhibit electronic intersubband transitions within conduction bands and attract much attention due to their operation at room-temperature short wavelengths. In this work we performed a theoretical simulation of such quantum cascade lasers and studied the influence of their construction and application conditions on optical behaviour. The intersubband absorption processes in these quanta well structures were studied. Electronic properties and the conduction band edge profiles were simulated as well as the probability densities of the Wannier-Stark states were determined. The simulation results showed that with the rise of the temperature the threshold current density increases which also leads to a decrease in the optical gain. An increase of the applied electric field is accompanied by the optical gain rising and decrease of the threshold current density that results in a blue shift of laser frequency.
Investigation of full arrangement of models on the mechanical properties of samples made from photopolymer material FullCure 720
Authors: Balyakin A V , Vdovin R A , Kyarimov R R 
Published: May 2020

Abstract
The results of experimental studies to determine the relationship between arrangement of synthesized model on build platform of 3D printer ObjetEden 350 and mechanical properties of the model fabricated from FullCure 720 photopolymer material were described. During the study, measurements of hard-fabricated samples were made, and the strength and plastic properties of FullCure 720 photopolymer material while tensile test were analyzed.
Features of cracking during rolling of new aluminum alloys of the Al-Mg-Li system
Authors: Agafonova D V 
Published: May 2020

Abstract
The authors consider the influence of the new integrated method of thermoanalytical analysis on cracking during rolling of materials of the Al-Mg-Li system, advanced for the aerospace components manufacture. The nature of cracking depended not only on the compression degree of the material, but also on the temperature, holding time of the material in the furnace, and rolling speed. The temperature range has been experimentally revealed, that makes it possible to predict and thereby prevent appearing of cracks network over the area, select the optimal mode when rolling advanced materials in the field of aerospace engineering.
The influence of the chemical composition of the Fe-Cr-Al system coatings on the oxide films phase composition
Authors: Shmorgun V G , Bogdanov A I , Kulevich V P , Kharlamov V O 
Published: May 2020

Abstract
The phase composition of the oxide films on the surface of the Fe-Cr-Al system coatings is studied using glancing angle X-ray diffraction. It is shown that at 900 °C the formed oxide films consist of αAl2O3 and (FeCr)2O3, to which FeAl2O4 oxide is added during long-term exposure. An increase in temperature to 1100 °C intensifies the growth of oxide films, and an increase in the aluminum content ensures a stable growth of αAl2O3 and FeAl2O4 oxides. When the aluminum content in the coating is more than 10 at. % at large exposure times, metastable alumina δAl2O3 is formed, the formation of which is associated with a decrease in the concentration of chromium in thin surface layers.
Digital management by supply networks in engineering
Authors: Provotorov V V , Danilevich D V , Fedotov A A , Sergeev S M , Kravets O Ja 
Published: May 2020

Abstract
Current Mechanical Engineering Production has a complicated network structure for technological processes providing. Equipment digitization of material transition allows you to get a real-time slice of economically important indicators. Also, the whole dynamics of production functionality can be presented in the formal view by mathematical models. The article deals with transference processes in linear commercial networks, which are network-like diffusive phenomena described by classical equations of mathematical physics. In addition, many problems of mathematical physics lead to the necessity to define coefficients in the partial differential equation and coefficients in boundary conditions with known functionals from the solution of the matching initial - boundary value problem. In case of depending coefficients in the differential equation on a spatial variable, the real presentation of the solution makes it impossible to define these coefficients. Therefore, other approaches, in particular, spectral ones figure in this article.
The equipment for measuring the solubility of granulated and liquid types of substances in a supercritical fluid
Authors: Khazipov M R , Sagdeeva G S , Pastushenko I L , Sagdeev A A , Galimova A T , Mikhaylov A B 
Published: May 2020

Abstract
Improved device for the implementation of extraction processes using supercritical fluids (SCF), which allows to achieve a constant predetermined pressure in the cell and to eliminate multiple control of the SCF flow rate due to the installation of a chiller that provides increased heat transfer performance and minimal inertia of coolant temperature fluctuation. To assess the reliability of the results obtained at the facility, verification measurements of the solubility of anthracene in supercritical carbon dioxide (SC-CO2) were carried out at T = 423 K and P = 10 - 20 MPa. The results are in good agreement with published data. The methodology for expressing measurement uncertainty is described in detail taking into account parameters that contribute to the uncertainty based on the calculation formula for calculating the solubility of anthracene and the measurement uncertainty of the specified parameters.
The methodology of a part lifetime calculation
Authors: Chumakova L A , Bulganina M Y , Alexandrova A S 
Published: May 2020

Abstract
Reducing mills in piece-reduction at the moment of capturing the pipe’s front end and on the rear end exit are exposed to increased dynamic loads. However these processes at present time are not fully researched. The relevant problem is to decrease dynamic loads in the clamp engine, to increase reliability and durability of the clamp on the basis of the mill’s production growth on the account of pauses decrease, rise of the production amount, and reducing in pipe costs. In the article the results of the study to define a part lifetime in the reducing mill stand have been presented. A part lifetime was calculated in month for more convenient comparison with the production data. The results have been hand over to JSC “PNTZ” for implantation.
Influence use of methanol in the engine on content nitrogen oxides and soot in the exhaust gases
Authors: Likhanov V A , Anfilatov A A 
Published: May 2020

AbstractThe article presents the advantages of using methyl alcohol on tractor diesel compared with traditional hydrocarbon fuel of petroleum origin. The potential effect of methyl alcohol is considered when it is burned directly in a diesel cylinder with an ignition portion of diesel fuel when working with a dual fuel supply system, depending on various installation angles of advancing fuel injection on emissions of harmful substances with exhaust gases.
Research of influence of errors of cam manufacturing on the law of motion of output element
Authors: Samsonenko D M , Khudoyarov V A , Barbashov N N , Abdullina L R , Potapov D M 
Published: May 2020

Abstract
Insignificant error in the moment of manufacturing the mechanism can influence significantly on its’ work. Research of influence of manufacturing error with manufactured mechanism usually is irrational, that’s why necessity of evaluation at the stage of design occurs. Methods of evaluation of this influence are investigated in this paper. The research is implemented by developed algorithm, which also was realized in MATLAB and Python as well. Due this fact process of math simulation doesn’t occupy a lot of time and doesn’t need large calculating abilities. We research same data by independent ways by using 2 different programs and we compare results in order to check and improve model. Also, it’s interesting that technology of computer vision was applied in this work. So, presented paper will be interesting for everybody who practice design of cam mechanisms or research them.
Semantic segmentation in flaw detection
Authors: Kotyuzanskiy L A , Ryzhkova N G , Chetverkin N V 
Published: May 2020

Abstract
The paper presents a review of study on detection and classification of defects using semantic image segmentation based on convolutional neural networks. Taking into account the revealed general features of flaw detection tasks of various industries related to the lack of a large marked data set and the need to detect defects of small sizes. The convolutional neural network of the u-net architecture was chosen as the basis for the decision support system. Testing of this architecture on several datasets yielded positive results regardless of the area of use.
Kinematic analysis anthropomorphic gripper with group drive
Authors: Petrenko V I , Tebueva F B , Gurchinsky M M , Pavlov A S , Antonov V O , Ryabtsev S S 
Published: May 2020

Abstract
The advantages of anthropomorphic robotics include the ability to work in a human-oriented environment and the performance of complex tasks that usually only a person can cope with. One of the most important tasks in this area is the development of powerful anthropomorphic grippers. For several reasons anthropomorphic grippers with group drives are promising, in which movement from several joints is performed from one drive. The purpose of the article is a kinematic analysis of one of the possible design of such a gripper. In the article solved the direct and inverse problems of kinematics in an analytical form using the geometric method. The dependences of the Cartesian coordinates of the joints of the fingers on the joint coordinate describing the motion of a group drive were obtained for the solving the direct kinematic problem. The dependences between the joint coordinate of a group drive and desired position of the finger joints or the orientation of its links were obtained for solving the inverse problem of kinematics. The obtained results can be used further for performing dynamic analysis, parametric synthesis of the design and synthesis a control system for an anthropomorphic gripper with group drive.
Method for determining damping coefficient, characteristic friction force in the needle mechanism
Authors: Rakhmonov I M , Uzakova L P , Naimova D N , Otamurodov J O , Adizova N Z 
Published: May 2020

Abstract
The article presents the development and justification of parameters of the new design of the sewing machine needle mechanism with elastic coupling, which provide an increase in speed modes of operation while reducing operating costs. As well as new scientific results obtained based on theoretical and experimental studies. A new design of the needle mechanism of a sewing machine with an elastic connection is developed and the problem of the dynamics of the needle mechanism with an elastic connection is solved by taking into account the dynamic and mechanical characteristics of the engine, inertial, elastic-dissipative parameters of the mechanism, as well as the resistance force of the sewn materials by the sewing machine. The dependences of the parameter changes in the function on the resistance force of the cross-linked materials are obtained.
New methods of processing of Cuban nickel ores and technogenic slimes
Authors: Bazhin V Yu , Nikolaev A N , Turro A B 
Published: May 2020

Abstract
In this paper the problems of beneficiation of lateritic nickel ores of the Cuba Republic and passing extraction from them and slurry waste of elements of platinum group is discussed. For carrying out research 100 kg of ore and 130 kg of tails of beneficiation were selected. It is established that in the course of receiving nickel-cobalt go of a sinter in slimes concentrates rhodium (0,074 %) and platinum (0,018 %). The chemical composition of the ore is now determined at the specialized pilot processing research center in Cuba on eight elements only (Ni, Co, Si, Fe, Mg, Al, Cr), but rare and PGM metals content is not included in the assessment scope. Within the scope of science and engineering cooperation between the Mining University (St. Petersburg) and the Higher Institute of Mining and Metallurgy, Moa a dressability assessment of laterite ores involving recovery of other rare earth metals (REM) has been performed. The investigation of the performance data available allowed to arrive at a conclusion that the most expedient means of production cost reduction to make it competitive with no capital reconstruction of metallurgical shops will be a pre-concentration process.
The influence of manufacturing errors of cases on their assembly
Authors: Yamnikov A S , Rodionova E N , Matveev I A 
Published: May 2020

Abstract
The authors of the article propose a way to increase the accuracy of processing pipe casings included in special products. Currently, in the current production of these products, there is a need to increase the accuracy of manufacturing cases, so it was decided to conduct research work. The article discusses the process of processing long bodies from thick-walled workpieces using hoods, which ensures high precision workpieces and minimal impact on the properties of the initial type of workpiece. As a result of the research, the significance of the geometric errors of the component pipes of the product on its functionality is analyzed. The achieved accuracy of the manufacture of base surfaces and the parameters of their possible distribution are shown. The similarity of the parameters of the initial part and further assembly is determined, it is also shown that the runout of the end surfaces of the part has a significant effect. The optimal basing scheme for finishing the end surfaces of long bodies is shown.
Regulatory systems aimed at providing safety on railway transport
Authors: Khakimzyanov Rustam R , Mashtakov Alexander P , Nesterov Sergey V 
Published: May 2020

Abstract
The article presents the analysis of the existing regulatory and legal framework for the railway transport. The article includes the problems that appear in the process of certification, that is the contradictions in the regulatory system. It is proposed to improve the regulatory system and to develop a new procedural framework for the railway production connecting with the demands on the terms of the life cycle.
Selection of the optimal configuration of a signal transmission system through a rock depending on the mine geological structure
Authors: Kokhon’kova E A , Kudinov D S , Neverov A S , Romanov V V 
Published: May 2020

Abstract
The article gives numerical estimates of a wireless warning system model and individual call of personnel in mines using a low-frequency electromagnetic field (ULR-range) with account for low-resistivity ore reserves. The presence of such deposits is represented by the main problem of the implementation of TTE (Through-the-Earth) communication due to the large size and strong shielding properties, which are also evaluated. The article shows numerical estimates for two long dipole antenna configuration models (symmetric and asymmetric). The comparison provides an assessment of the benefits of different antenna installation options to neutralize the shielding properties of the deposits.
Theoretical grounds for the propagation of electromagnetic waves of low-frequency (URL) in low-resistivity rocks
Authors: Kudinov D S , Maykov O A , Kokhonkova E A , Romanov V V 
Published: May 2020

Abstract
The article describes and estimates the method of wireless data transmission through rocks using a long dipole antenna, and also describes the effect on the propagation of low-frequency electromagnetic low-resistivity inclusions in the form of non-ferrous metal deposits. Estimates of the methods from other articles and their assessment in the presence of such bodies are given. A numerical analysis of the proposed system was also made for given parameters of the field source and rocks with a special configuration of antennas.
Algorithms for replacing tools on multifunctional metal-cutting equipment
Authors: Shadsky GV , Isakov IN 
Published: May 2020

Abstract
The results of the work aimed at reducing organizational downtime of equipment associated with the readjustment of machines during the transition to the manufacture of another type of product are presented. A set of measures is proposed, which includes the formalization of the technological process in a matrix way, which allows describing the processing from the point of view of the cutting tool and machine tools used. After formalization, various methods of cluster analysis were applied to determine the sequence of starting parts into processing, at which the equipment readjustment time would be minimal. For the study, equipment having a block layout was selected. A key place in the article is given to the problem of determining the procedure for replacing equipment in machine blocks with a built-up sequence of starting parts for processing. Several algorithms are proposed, among which the best one in terms of the number of necessary replacements in the equipment blocks has been selected.
Change of magnetic properties of metal in the zone of stress concentrator
Authors: Khajbullina L V 
Published: May 2020

Abstract
Studies show that there are certain problems in assessing the stress-strain state of structures by magnetic control methods, so it is necessary to carry out additional theoretical and experimental studies of magnetic parameters on standard samples from structural steels, which will help to reduce uncertainty of magnetic control results. In operation, dependence of intensity of own magnetic field of scattering in eight directions is established from concentrator of stresses at tension of cylindrical sample with artificially created concentrators of stresses in the form of overcooler with diameter of 2 mm from steel C 20 in elastic area. The analysis of the obtained dependencies revealed a change in the intensity distribution of the own magnetic field of metal scattering in the vicinity of the stress concentrator. In general, the distribution of the strength of the intrinsic magnetic field of the metal scattering in the zone of the stress concentrator tends to increase when the stresses are removed from the concentrator, but there are areas where the strength of the intrinsic magnetic field of the metal scattering is reduced when the stress is removed from the concentrator, which may indicate an intended fracture zone. There are no sharp changes in the intensity values of the own magnetic field of metal scattering at increase of tension load in the elastic region.