bluuebunny/crossref_metadata_2025_split huggingface dataset:
Creation of corrosion resistant coatings on ductile iron by re-melting flame sprayed layers using laser and electron beam
Authors: Drimal D , Kolenic F , Simek M 
Published: February 2020

Abstract
The paper presents the results of the research of the formation of thin surface corrosion resistant layers on ductile iron with spheroidal graphite. Surface layers were created by a two-step technological process. In a first step, the surface layer material was applied to the surface of the ductile iron by means of a flame-powder coating in a thickness of 0.8 to 1 mm. The treatment of the layer was carried out in the second step by means of a defocused laser beam or a programmed-deflected electron beam. The influence of the laser beam defocusing and the influence of the energy distribution of the deflected electron beam on the characteristics of the formed thin surface layer was studied. 40 mm thick GGG 40 ductile iron samples were used as the substrate experimental material. The Ni-B-Si-type nickel powder with the designation NP22 and Ni-Cr-B-Si-type nickel powders of the type NP52 were used to form the surface layer. The quality of layers was assessed on the basis of surface forming, metallographic evaluation of selected properties of the layer and measurement of micro-hardness at the interface of the layer and the substrate material.
Researches of metal texture after friction stir welding
Authors: Gozbenko V E , Balanovsky A E , Kargapol’tsev S K , Karlina Yu I , Karlina A I 
Published: February 2020

Abstract
The results of studies of the structure of an aluminum alloy by the method of backscattered electron diffraction (EBSD) are presented, which allows determining disorientation angles between grains, present data in the form of an array of angles and sizes, direct and inverse pole figures and many other types of useful information, as well as identify boundaries and sub-boundaries grains. It has been shown that friction stir welding is a process with a predominance of shear; the observed shear texture can indicate the local orientation of the material flow during welding. The three-dimensional material flow detected by these texture orientations shows important changes, especially on the advancing side of the weld.
Possibility of obtaining complex form details using additive surface technology
Authors: Kargapol’tsev S K , Balanovsky A E , Gozbenko V E , Karlina Yu I , Karlina A I 
Published: February 2020

Abstract
The authors consider the possibilities of using welding in protective gasses with a melting electrode for the manufacture of parts of complex shape. The results of surfacing parts such as square and cylinder are presented. In the course of the research, the technological features associated with the parameters of the welding arc and melting of the surfacing wire were established. Arc current has the greatest effect on the appearance of the molding. The wire feed speed affects the height of the deposited roller. It is shown that the stability of the formation of deposited rollers depends on the transfer modes of the metal, which depend on the conditions of supply and input of wire into the melt pool. The additive technology of metal deposition allows one obtaining parts with a surface different from the base metal, high wear resistance at normal and elevated temperatures, and corrosion resistance. Surfacing can be performed both in the manufacture of new parts and in repair and restoration work, significantly extending the life of parts and assemblies, thereby ensuring a high economic effect.
Effect of molybdenum on the hot-tearing susceptibility of the Ni-Cr-Mo-B system
Authors: Nazarko A S , Plomoyalo R L , Dmitrenko D V 
Published: February 2020

Abstract
The paper presents data on the effect of molybdenum on the hot-tearing susceptibility of the Ni-Cr-Mo-B system when surfacing with nickel-based alloys. With a boron content of 2.5-3.2%, as well as low carbon and silicon content, the alloying elements, depending on a doping concentration, have different effects on the technological strength of the deposited metal. Molybdenum increases the technological strength of alloys. Alloying the deposited metal with molybdenum in an amount up to 12% in alloys with 2.5% boron concentration at 20% chromium does not lead to the disappearance of cracks. At a molybdenum concentration of more than 12%, the number of cracks in the deposited bead decreases and when the molybdenum concentration is equal to 15%, the cracks disappear, and only increasing the molybdenum content to 20%, in the presence of at least 20% chromium in the alloy, makes it possible to obtain deposited metal without cracks.
Simulation of fractional efficiency of direct-flow cyclone with intermediate dust collector
Authors: Aslamova V S , Aslamov A A , Arschinskii M I , Zhilycov Y V , Rudykh E A 
Published: February 2020

Abstract
By means of numerical modeling in the program ANSYS Fluent CFX the evaluation of fractional efficiency in a direct-flow cyclone with intermediate dust collector has been carried out. The boundary conditions were as close as possible to the experimental ones. As a gas phase, the authors take the air under normal conditions, as the solid phase – spherical particles of 30 and 80 microns in size. In order to evaluate the adequacy of the calculation model, a laboratory installation of a DCIC with two separate chambers for the selection of collected particles was made. This design allowed estimating the fractional efficiency of both individual chambers of a direct-flow cyclone DCIC and the apparatus as a whole. The results of the experiments carried out on different types of dust (fly ash, cement) showed a good convergence with the design model
Expert system for aggregate industrial safety assessment at enterprises based on knowledge technologies
Authors: Aslamova E A , Arshinsky L V , Aslamova V S , Krivov M V 
Published: February 2020

Abstract
The work presents the knowledge base of the expert system of the aggregate assessment of the level of industrial safety at a hazardous production facility, based on the use of the logico-axiological approach. The fundamental hypothesis: the reduction in production safety is due to the presence of “NE-factors”: poor implementation of organizational measures, improper working conditions, inadequate personal protective equipment and so on. Failure to take measures to provide protection against industrial accidents leads to a reduction in the level of industrial safety. According to the approach used, the influence of “NOT-factors” on the level of “non-safety” of production is formalized by products of the type: (SIC)A ->(SIC)B.
Design of the tooling of a complex geometric shape for electrothermal processing of the polymer covering plate of the bogie friction wedge
Authors: Butorin D V , Larchenko A G , Alexandrov A A 
Published: February 2020

Abstract
The article analyzes the operation of the bogie friction wedge. It considers the question of the necessity and possibility of enhancing the reliability and operational resource of wedge-type shock absorbers of railway bogies by increasing the operational properties of a polymer covering plate of a bogie friction wedge. A method for increasing the operational properties of the polymer covering plate, consisting in its processing by high-frequency currents, is proposed. To implement the high-frequency processing of the considered polymeric covering plate and achieve its uniform warming-up throughout the volume, a specialized tooling is developed and constructed according to the technique established earlier. The developed tooling made it possible to implement a uniform non-inertial self-regulating high-frequency heating throughout the entire volume of the polymer covering plate in laboratory conditions with high intensity. As a result of full-scale tests of the developed tooling and the proposed method of high-frequency processing, deviations of temperature values in different parts of the heated polymer plate became apparent. All of this shows that the heating is not completely uniform. The greatest deviation value was 7.9%. As a result of the work, it was possible to establish the reasons for the lack of full uniformity and to determine the direction of further research.
Research of high-frequency influence on polymeric materials of rolling stock products
Authors: Filippenko N G 
Published: February 2020

Abstract
The paper presents the main directions of the technological process of high-frequency processing of polymeric materials used in rolling stock products. The necessity of developing a mathematical model of the critical process of exposure to high-frequency energy is substantiated. As a model, an imitational mathematical model of the process of high-frequency processing of polymeric materials that takes into account breakdown phenomena is proposed (based on experimental studies of a large number of the most used polymer materials).
Analysis of dynamic characteristics of frequency-dependent links
Authors: Kolmakov V O , Kolmakov O V , Ilyin E S , Ratushnyak V S 
Published: February 2020

Abstract
The article is devoted to an experimental study of the dynamic characteristics of the four-beam frequency filter under consideration in various power consumption modes. Based on the PSpice program, a typical power supply circuit for LED lamps was modeled. The peaks of the harmonic series reflect the power of the higher harmonics relative to the fundamental harmonic. In the three-phase mode of the lighting systems switching, the filter compensating device according to the four-beam “star connection” scheme is more efficient. The experimental results showed that the content of the 3rd harmonic, when the filter of the compensating device is turned on, exceeds the permissible state standard specification by 5% only in the 6-fold asymmetry mode in the current of the main power supply. Thus, in three-phase networks, using a four-beam passive harmonic filter, it is possible to suppress the higher harmonics of non-sinusoidal voltages and currents effectively. The filtering level of the harmonic components provides a significant reduction in the non-sinusoidality of the current and, as a result, an increase in the quality of electricity, as well as a reduction in power losses in the filter compensating device, a decrease in the overall dimensions of the filter and its cost.
Determining the geometrical parameters of spring suspension of locomotives
Authors: Kopanev M V , Arsentiev M O , Kuchera L Y 
Published: February 2020

Annotation
The paper considers the issues of measuring the geometric parameters of the springs using a laser-optical sensor. The features of an automated rig for measuring the parameters of the springs are presented. The work also investigates the operation of the laser-optical sensor. The results obtained allow using the laser-optical sensor for measuring the geometric parameters of the springs of a rolling stock. The measurements obtained with the laser-optical sensor to determine the parameters of the locomotive suspension springs are presented.
Magnetic vibrations in synchronous machines with permanent magnets and fractional slot concentrated winding
Authors: Toporkov D M , Kovtun M A , Popov I L 
Published: February 2020

Abstract
Nowadays synchronous machines with permanent magnets are widely used in motor manufacturing due to output parameters. The paper aims to analyse the radial magnetic forces that cause the stator vibration of a synchronous machine with permanent magnets and a fractional slot concentrated winding. The method to assess the vibration parameters of synchronous machine is proposed.
Simulation of non-sinusoidal modes in railway power supply systems during movement of high-speed trains
Authors: Kryukov A V , Cherepanov A V , Shafikov A R , Bezridnyj E S 
Published: February 2020

Abstract
Rectifier locomotives have non-linear current-voltage characteristics and generate higher harmonics (HH) in the power supply networks, which is accompanied by the following negative effects: reduced equipment service life, distortion of electricity metering, occurrence of resonant processes, etc. Therefore, the problem of reducing the levels of harmonic distortion in the networks adjacent to the traction substations of the AC railways is of increased relevance. The level of HH generation depends on the design features of electric locomotives. Electric stock with zone-and-phase regulation creates high harmonic distortions, which results in increased losses, increased electromagnetic effects on adjacent power and telecommunication lines and reduced reliability of power supply. Electric locomotives with asynchronous traction motors (ATM) connected via 4q – S converters virtually do not distort the sinusoidality of the current curve. To measure the degree of reduction of harmonic distortion during the movement of locomotives with ATM, simulation modeling of non-sinusoidal modes of a typical 25 kV traction power supply system was carried out for two variants of the locomotives used: 1) VL-80R with DC motors; 2) UTY –1 with asynchronous traction motors. The methodology for determining non-sinusoidal modes is based on the technology of modeling electric power systems (EPS) in phase coordinates; at the same time, the models of EPS elements were formed as lattice schemes characterized by a fully connected topology. The parameters of these circuits can be recalculated to the frequencies of HH. The proposed approach is universal and can be used to study non-sinusoidal modes in existing and future traction power supply systems. The simulation results showed that the problem of increased harmonic distortion in the networks feeding the traction substations can be completely solved by replacing the acting locomotives with new-generation electric locomotives with asynchronous electric drives and four-quadrant converters.
Diagnostic operation of fabrications of rolling stock by high-frequency method
Authors: Larchenko A G , Filippenko N G , Livshits A.V. , Kargapoltcev S.K. 
Published: February 2020

Abstract
In this scientific work, the authors consider the issue of non-destructive testing. In the article, the authors describe the process of improving the performance properties of polymeric products of complex configuration. In the article, the authors choose the method of high-frequency control as the most suitable for assessing the quality of products in the manufacture and during repair work. The scientific work describes the process of diagnosing products made from polymeric materials on the developed diagnostic device. This article describes the development of methods for designing a technological additional device for diagnosing products of complex configuration. In this paper, the authors solved the problem of manufacturing electrodes for experimental diagnostics. The authors drew conclusions and set goals for further research.
The correction system for the direction of a locomotive spotlight’s luminous flux
Authors: Manikovskij A S , Komogorcev M G , Stepanov V V 
Published: February 2020

Abstract
In this article the authors propose their concept of a correction system for the direction of a locomotive spotlight’s luminous flux in the horizontal plane during train movement. This solution will keep the railway tracks well-lit while the locomotive moves on curved track during night time and in limited visibility conditions and drastically increase the railway traffic safety.
Thermodynamic estimination of adsorption ability of modified zeolites
Authors: Obuzdina M V , Rush E A 
Published: February 2020

Abstract
The article presents the results of original investigations of the thermodynamic laws of sorption extraction of Ni2+, Zn2+, Cu2+from wastewater. As an adsorbent, a natural zeolite from the Holinsky deposit of the klinoptilolite type, modified with a sulphur polymer, obtained from waste in the production of epichlorohydrin was proposed. The limiting parameters of the adsorption process are described by the Langmuir equation. The graphical method the limiting value of adsorption, the adsorption equilibrium constant, the differential heat of adsorption, the adsorption rate constant, the activation energy, the Gibbs energy was founded. It is proved that the investigated processes obey the laws of physical adsorption and are spontaneous.
The use of electrohydropulse treatment of waste solutions in refining production for the recovery of platinum group metals
Authors: Yu Parfenov D , Ratushnyak V S , Ilyin E S , Yuryev A V , Kolmakov V O 
Published: February 2020

Abstract
The high cost of precious metals and environmental requirements lead to the need for the completeness of their extraction from primary and secondary raw materials.
During the processing of primary raw materials, waste solutions are produced that contain low-concentration precious metals, which must be removed from the process. To prevent losses and comply with environmental protection requirements, it is necessary to extract precious metals from waste solutions. The complexity of this task lies in the low concentration and chemical forms of the presence of precious metals in aqueous systems. The cementation method, currently used for the extraction of precious metals, has several disadvantages: the duration of the process, high-energy consumption, etc. To increase the efficiency of the method used, it is necessary to pre-treat the solution with the goal of labilizing the noble metal complexes. The purpose of the experiment: determination of the optimal modes of the electrohydropulse (EHP) method for intensifying the process of additional extraction of platinum group metals (PGM) and heavy non-ferrous metals from industrial solutions of refining production. As a result of the study, the necessary materials were selected to create the reactor and electrode systems, the volume of the laboratory reactor was determined. Trial launches of the installation were carried out, according to the results of which a pulse current generator (PCG) was configured. A series of tests was carried out, based on the results of which conclusions were drawn about the possibility of using this method to activate stock solutions.
Rationalization of parameters of hydraulic dampers of a carriage
Authors: Tarmaev A A , Petrov G I , Filippov V N 
Published: February 2020

Abstract
The possibility of the car dynamic performance improvement is studied through structural changes (modernization) of the passenger bogie. Based on the calculations of the natural oscillations of the car, the critical values were determined and rational values of the damper resistance coefficient were chosen for vertical and lateral vibrations. It was concluded that with the forced spatial fluctuations of a carriages on KCCW-CRI bogies the required damping value of the vertical oscillations should be twice as large as for the lateral ones; important factors in damping of the car oscillations are the central suspension dampers. The rational angle of installation of the hydraulic damper in the central suspension and the use of separate action in the central suspension of hydraulic dampers are justified. The proposed version of the modernization of the bogie can improve the smoothness indicators of the car by 25-30%.
Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering
Authors: Kotb H Mahfoz , Ahmad Mohamad M , Alshoaibi Adil , Khater Hassan A , Aljaafari Abdullah 
Published: February 2020

Abstract
Na1/2Y1/2Cu3Ti4O12 (NYCTO) ceramics with giant dielectric constant (ε′) were synthesized by simple reactive sintering. NYCTO nanopowder was first synthesized using high energy ball-mill. Then the pelletized powder was sintered in air at temperatures in the range 975 °C to 1050 °C for 10–20 h. The obtained ceramics showed pure CaCu3Ti4O12 (CCTO)-like cubic phase as revealed by x-ray diffraction measurements. Field effect-SEM observations showed that the grain size increases from 2 μm to 5 μm with increasing sintering temperature. NYCTO samples sintered at temperatures higher than 975 °C showed giant dielectric constant (103–104) over most of the frequency range. The minimum dielectric loss (tanδ) of ∼0.055 at 300 K has been approved for the ceramic sample sintered at 1050 °C. Impedance and modulus spectra of the current samples showed two relaxations related to semiconductor (grain) and high resistance (grain-boundaries) elements. The activation energy for conduction located in the range 0.1–0.5 eV highlighted the role of single ionized oxygen vacancies in the dielectric properties of the investigated NYCTO ceramics.
Preparation of cellulose film in ionic liquid by high shearing and application in pineapple preservation
Authors: Wei Xiaoyi , Zhang Lixiu , Wang Junhai , Li Jihua , Zhou Wei 
Published: February 2020

Abstract
In this study, the pineapple leaf cellulose film was prepared in ionic liquid by high shearing force and used for fresh-cut pineapple preservation. First, cellulose was dissolved in ionic liquid (1-butyl-3-methylimidazolium chloride ([Bmim]Cl)) using a high shear mixer. The regenerated cellulose was characterized by scanning electron microscope (SEM), x-ray diffraction (XRD), fourier transformed infrared spectra (FT-IR), and thermo gravimetric analysis (TGA). Results showed that the cellulose was dissolved in ionic liquid at room temperature with a high regeneration rate of more than 95% and for less than 2 min. It was suggested that the network of cellulose was destroyed by high shearing force. Then the cellulose film was obtained by casting on the glass plates. The mechanical properties of the films were evaluated by extension test with the tensile strength of 34 MPa. The proposed film was used for fresh-cut pineapple packaging. Results showed that it could significantly decrease weight loss and maintain the firmness of the pineapple, and thus, improve the quality of the fruit during storage. The findings demonstrate a facile biodegradable packaging route to improve food sustainability and reduce waste.
Structural response of A286 superalloy to rotary friction welding at different rotation speed
Authors: Jin Feng , Li Jinglong , Chen Dan , Liao Zhongxiang , Shi Junmiao , Xiong Jiangtao , Zhang Fusheng 
Published: February 2020

Abstract
Rotary friction welding was conducted on A286 with a diameter of ϕ25 mm under 300, 900 and 2100 rpm to understand the structural response of the joint welded at different rotation speeds. Joint morphologies, grain structures inside the morphologies and the corresponding mechanism that governs its formation were characterized and investigated using electron backscattered diffraction (EBSD), which focused on three featured zones located at the center, 1/2R and periphery of the joint. The influence of structural response on joint properties was also investigated. Results show that the morphology of the joint evolves from ‘disk shape’ to ‘near-line shape’ and ‘scissors shape’ as the rotation speed increases from 300 rpm to 2100 rpm. At low rotation speed, refined and recrystallized grains were formed inside disk shape morphologies. Whereas, sub-grains and deformed grains were evolved at the middle (900 rpm) and high (2100 rpm) rotation speed. The recrystallized grains surrounded by the ‘disk shape’ morphology have a positive effect on the joint strength compared with the sub-grains and deformed grains confined by the ‘near-line shape’ and ‘scissors shape’ morphologies.