bluuebunny/crossref_metadata_2025_split huggingface dataset:
Photovoltaic power generation control strategy
Authors: Yao Zenghui 
Published: February 2021

Abstract
This paper establishes the maximum power tracking technology based on the conductance increment method, establishes the PV model in a synchronous rotating coordinate system, and uses the grid voltage-oriented vector control technology to realize the decoupling of the active and reactive power of the PV. In order to meet the low voltage ride-through requirements put forward by the State Grid Corporation of China, this paper proposes a low voltage ride-through strategy for PV.
Modeling and parameter identification of composite power supply for plug-in HEV
Authors: Sun Jingxia 
Published: February 2021

Abstract
By analyzing the characteristics of the components of PHEV composite power supply, the voltage characteristics, temperature characteristics and capacity efficiency of batteries and supercapacitor are clarified. The dynamic voltage characteristics of batteries and supercapacitor are simulated by modeling the composite power supply. Based on the cross current discharge characteristics of lithium-ion batteries and the application conditions of batteries in PHEV, the second-order linear battery model recommended in PNGV is selected in this paper; for supercapacitor, the simplified RC branch model can be used to describe the characteristics, and the experimental data are used to identify the parameters involved in the model, and the accuracy of the model is verified.
New nitriding process of high-alloyed maraging steel for cryogenic operation
Authors: Belashova I S , Bibikov P S , Petrova L G , Sergeeva A S 
Published: February 2021

Abstract
The paper considers the gas nitriding process with cyclic alternation of atmospheres: ammonia and an ammonia mixture with air for strengthening the corrosion-resistant high-alloyed steel 03Cr11Ni10Mo2Ti, designed to operate at cryogenic temperatures. The formation in steel of a nitrided layer of 130—150μm thickness with increased microhardness (more than 12GPa) is shown experimentally. During the final stage in the ammonia and air environment, iron oxides remain in the compound zone, and a sharp drop in hardness is observed at the border of the core. At the completion of the cyclic process with the stage of saturation in ammonia, a nitrides zone is formed based on the γ′-phase, the layer thickness increases (up to 180(…200μm) and the microhardness profile is smoothed, which reduces the risk of embrittlement.
Reduction of mine methane emissions for ensuring sustainable development of geotechnologies in the transition to Industry 3.0
Authors: Dzhioeva A K , Tekhov A V 
Published: February 2021

Abstract
The need to apply innovations in the field of environmental modernization is related to all branches of the domestic industry. Its particular relevance for the enterprises of the mining complex necessitates the neo-industrialization of the integrated development of the subsoil resources. The article defines the conceptual conditions for the development of sustainable geotechnologies. The nonlinear nature of the dynamics of methane release into the methane drainage boreholes has been proved and an explanation of the mechanism for its implementation under the influence of situational geomechanical conditions for developing reserves of high-gas-bearing coal seams has been proposed.
Photo-, cathodic- and electroluminescence-band models in solid (SiC)1-x(AIN)x luminescence centers and SiC/SiC-AIN LEDs
Authors: Dadashev R Kh , Sankin A V , Altukhov V I , Safaraliev G K , Elimkhanov D Z , Antonov V F 
Published: February 2021

Abstract
The paper presents models of bands (levels) in solid (SiC)1-x(AlN)x luminescence centers and n-SiC/p-(SiC)1-x(AlN)x
heterostructures (light-emitting diodes). The diagram of (SiC)1-x(AlN)x
energy gaps shows the positions of luminescence levels, subject to x. A SiC/SiC–AlN series of electroluminescence bands, for the first time, is found to have a continuous relationship between the positions of short-wave and long-wave band maxima in a K-minimum conduction band, respectively, as continuous functions of contact current density.
Designing mining machinery screw modules
Authors: Evstratov V A , Voronova E Yu , Linnik Yu N , Linnik V Yu , Apachanov A S , Grigoryev V I , Suxarnikova V A 
Published: February 2021

Abstract
Screw modules are widely used in technological and transporting machines. Their main disadvantage is low productivity due to the fact that the material moves partly in the direction of the feed and partly rotationally as a result of the torque transmitted by the screw blade to the material. The rotational component of the material movement significantly reduces the performance of the screw. The work considers the possibility of mining machines with screw modules efficiency improving by determining the rational screw shaft configuration, depending on the properties of the feed material and the operating conditions of the module, realized at the designing stage. The aim is achieved by means of a mathematical description of the screw feed process that takes into account processes occurring both on the surfaces of the material contacts with the working bodies of the machine and inside the material mass, including the occurrence of a sliding surface in the material. Furthermore, some part of the material sticks to the screw and moves in concentric circles, with no axial movement in the feed direction, which reduces the performance of the screw. The screw shaft configuration is determined by means of design procedures based on the mathematical description of the screw feeding process, given in the work. The description takes into account the processes occurring in the mass of the feed material. The resulting mathematical model of the screw feeding process allows designing screw shafts with shape identical to the sliding surface in the material, which will increase the performance of the screw module by 20-23%, by reducing the rotational component of the material movement and increasing the translational component in the feed direction.
Automation of individual operations of the transport process to create sufficient conditions for the efficient functioning of digital transport and logistics
Authors: Guseva E A , Konstantinova M V , Olentsevich V A , Konyukhov V Yu , Olentsevich A A 
Published: February 2021

Abstract
The current evolution in information technology will enable the railway industry to bring the concept of a customer-centric marketing approach to life. At present, the main factor for ensuring the competitiveness of the transport company, which emphasizes the position in the transport services market, is to provide a service with a qualitatively new modern level of services, based on the opinion of consumers of these services. The digitalization of railway transport and logistics, the use of modern technical means and programs allows one to improve the efficiency of the transport complex in general and on separate subsystems, as well as to ensure high quality of services. The introduction of an automated procedure for the optimal placement and fastening of the cargo in the production process will allow transport and logistics market operators to predict the occurrence of risk cases at each stage of the transport process. Algorithms for selecting the type of rolling stock to transport the cargo of the relevant category and the typical scheme of placing cargo in it, as well as the method of fixing cargo, have been developed and presented. Since the digitization of supply chains depends more on the type of cargo and the type of rolling stock chosen for transport, the construction of algorithms is based on the example of a flat-base cargo. The development of the automated procedure is based on the construction of a model scheme for placing and fastening a particular type of cargo. The results of using the developed automated procedure make it possible to determine the magnitude of the load shift and tension in the fasteners under the influence of various factors.
Identification of generalized Cobb-Douglass production functions with multiplicative errors in variables
Authors: Sandler I L , Ivanov D V , Lifshits M Yu , Diligenskaya A N 
Published: February 2021

Abstract
The article discusses the identification of a class of generalized Cobb-Douglas production functions with multiplicative errors in all variables. The article proposes a generalization of Cobb-Douglas production functions in the presence of memory for input and output variables. Parametrization of noise in the form of multiplicative noise in all observable variables is proposed. The logarithmic transformation of such production functions leads to the need to solve the problem of estimating the parameters of a linear difference equation in the presence of additive errors in all variables. To identify the parameters of production functions, a modification of the method of total least squares was used. Computational experiments have shown high accuracy of parameter estimation based on the proposed algorithm.
Algorithm for calculating the time of thermal pulse processing of small-sized high-precision parts
Authors: Karlina A I , Ershov V A , Kargapoltsev S K , Gozbenko V E , Karlina Yu I 
Published: February 2021

Abstract
The thermal impulse method of deburring is one of the most promising methods for removing unwanted liquids formed on the surface of small-sized high-precision parts of electronic equipment at the stage of blade machining. The thermal impulse method of deburring and rounding of sharp edges is characterized by constant processing time and quality, subject to the normalized size of liquids. Such qualities can significantly increase the stability of the release of parts in time, and, thanks to this, successfully implement a system of operational scheduling of production. This article describes an algorithm for calculating the time for thermal pulse processing of small-sized parts of coaxial radio components. An example of a basic generalized calculation of the time spent on thermal impulse processing of typical parts using a Pulsar-VKF thermal impulse installation of various configurations is given. Taking into account the peculiarities of thermal pulse processing of parts of coaxial radio components, a method for calculating the batch size and thermal pulse processing time, subject to algorithmization, is developed, conditions and restrictions, input and output information for the algorithm are described. Formulas for calculation are given.
Automation of failure forecasting on the subsystems of the railway transport complex in order to optimize the transportation process as a whole
Authors: Konstantinova M V , Olentsevich A A , Konyukhov V Yu , Guseva E A , Olentsevich V A 
Published: February 2021

Abstract
The existing technology of working with railway rolling stock belonging to various operators should improve the safety of the transportation process. This is one of the priority issues of the operation of the railway transport complex and is aimed at improving the safety of the goods transported, reducing the cost of repairing losses associated with loss or damage to cargo, reducing the non-productive costs of eliminating various types of traffic safety violations. At the same time, the majority of “new” operators providing services do not set out to ensure the safety of the transportation process. The main condition for them is to get the maximum amount of income and profit. These reasons have led to significant changes in the pattern of relations between cargo owners, carrier, rolling stock operator companies and require the speedy automation of most production cycles in order to ensure full control of the situation on the smooth organization of the transportation process. The article assesses the safety of the railway transport complex and constructs a mathematical model of the impact of specific indicators of the violation types on the overall safety level. The described system of mathematical predictive regression-type models can be used in the future to predict the level of security in the selected areas of activity. The factors that have the most significant impact on the safety of technical means by using the developed program complex of failure forecasting have been identified. The proposed program will enable structural managers to make reasoned decisions to improve the safety of the transportation process in both freight and passenger transport.
Combined thermochemical treatment of steel construction parts to increase their corrosion resistance
Authors: Petrova L G , Demin P E , Sergeeva A S 
Published: February 2021

Abstract
Electrochemical corrosion of construction parts made of structural steels appears due to different electrochemical potentials (ECP) of contacting materials. The values of ECP of carbon steels may be more or less compensated by forming of alloyed layers or coatings by methods of thermochemical treatment (TCT). The following combinations of TCT were examined for surface modification of steels: (a) application of zinc coatings by a method of cold zinc-plating with subsequent classical gas nitriding in ammonia; (b) joint diffusion saturation by zinc and nitrogen; (c) joint diffusion saturation with chromium and nickel. Metallographic and microhardness methods were used for the study of modified layers and coatings. Strengthened layers with a thickness up to 140…150 microns were formed in low-carbon steels after nitriding of zinc coatings at 540°C for 24 hours, and after combined TCT with multicomponent saturation by Cr+Ni at 1000°C for 7 hours. Both methods of TCT increase the corrosion resistance of low-carbon steels and low-alloyed steels. Corrosion products examination in 5% NaCl salt fog shows that the dissolution of nitrided Zn coating and formation of corrosion products slow down with the increase of zinc concentration in the coating.
Methodology for the implementation of a technological solution, taking into account the optimization of production business processes based on simulation
Authors: Shanin I I 
Published: February 2021

Abstract
The current production activity of modern commercial organizations is focused on the use of effective technological solutions. The main goal of any commercial organization that carries out production and sales activities is the release of a certain type of industrial product that meets certain consumer and quality characteristics. Any commercial activity is focused on improving the efficiency of technological processes using rational approaches to save production resources to further maximize profits. When building a technological production chain, it is necessary to analyze production business processes, taking into account both the individual needs of consumers in industrial products and taking into account the main goal of a commercial organization, taking into account the introduction of modern technological solutions. The study proposes to introduce an effective technological solution into the production process, based on the results of simulation (for example, furniture production). Therefore, to assess the performance of technological processes and the effectiveness of the use of machinery and equipment, it is necessary to apply an approach to the implementation of an effective technological solution. For this, it becomes necessary to develop an algorithm for the implementation of an effective technological solution, taking into account the optimization of production business processes based on simulation, based on increasing the efficiency of using machines and equipment and reducing downtime in the production process chain.
Method for determining the reduced parameters of the mixer gear drive
Authors: Podgornyj Y I , Skeeba V Y , Martynova T G , Skeeba P Y , Lobanov D V , Martyushev N V 
Published: February 2021

Abstract
The article presents the method of determining the reduced moments of a mixer mechanism with an epicyclic gear and a rocker arm. The method consists of using a mathematical model of the mechanism; determining the change of process load on the device working shaft; determining the dependence of the moments change on inertia forces and their values and reducing them to the main shaft of the device. It also includes determining the dependence of the change in the total moments values on the forces of useful resistance and on the moments of inertia forces and reducing them to the main shaft of the device.
Automated calculation method effect values in load securing elements fixed on a rolling stock
Authors: Vlasova N V , Olentsevich V A , Konyukhov V Yu , Lysenko D A 
Published: February 2021

Abstract
The article presents a method for the automated calculation of the magnitude of the efforts in the means of securing cargo fixed to the rolling stock in accordance with the Technical Conditions for Stowing and Securing Cargo in Wagons and Containers - a regulatory document of JSC Russian Railways (hereinafter referred to as TU). The method provides for all possible factors of the influence of the forces acting on the transported cargo as a result of its movement from the point of loading to the point of unloading, including the necessary technological operations performed along the route, using the example of a cargo with a flat base using the capabilities of the computing environment. The obtained research results are supposed to be used by shippers in the development of the optimal method for placing and securing transported goods on the rolling stock. The automated calculation method will allow obtaining the predicted value of the cargo shift value both along and across the car from the total effect of longitudinal, transverse and vertical forces acting on the cargo along the way. These values make it possible to optimally determine the place of installation of thrust bars on the car floor, depending on the geometric parameters of the transported cargo and the chosen method of fastening it to the rolling stock.
Hydraulic control valve spool restoration by composite galvanic coating
Authors: Yudina E M , Kadyrov M R , Serguntsov A S , Samurganov G E 
Published: February 2021

Abstract
Methods of restoration of hydraulic control valve spools by galvanic coatings are considered. Methods for preparing parts for applying electroplated composite coatings in order to increase the adhesion strength of electrolytic iron to alloy steel are proposed. The optimal modes of electrolysis for obtaining high-quality galvanic coatings are selected, the composition of the electrolyte is substantiated and the optimal content of the dispersed phase in it is selected. The design features of the coating bath for active mixing of the dispersed phase in the electrolyte are substantiated. The parameters of the technological process for spools restoration by applying composite galvanic iron-based coatings are proposed.
On the issue of compensation of spring fittings for parts made by longitudinal stretching
Authors: Mironenko V V , Govorkov A S 
Published: February 2021

Abstract
The paper considers the problem related to the compensation of springing in the fitting of parts produced by longitudinal stretching. The imitating modeling of shaping by longitudinal stretching using elasto-plastic model of material taking into account anisotropy was carried out on the example of one element. The adequacy of modeling was checked according to the following criteria: deformation ratio; thinning; Keller-Godwin’s chart and required shaping force. Conclusions were drawn on the adequacy of modeling. Implicit calculation of springing gradients in an element was carried out and thus the iterative calculation of compensation of springing in the fitting. The negative effect of springing compensation at such scheme of shaping is shown. Change of the springing size in the course of iterative calculation of springing compensation in the fitting is also shown.
Simulation of the method of excitation of pulsations in a moving fluid flow
Authors: Galimullin M L , Khabibullin M Ya , Suleimanov R I 
Published: February 2021

Abstract
The article deals with an important issue of efficiency of using energy supplied into each of the elements of the Venturi-type pipe, i.e. the value of energy efficiency coefficient. The issue coverage requires conducting comparative studies of the specific surface area of bubbles in a gas-liquid system and the mass transfer coefficients in a pipe with a periodically changing cross-section and in a cylindrical pipe with other conditions being equal. The proposed method of excitation of pulsations in a moving fluid flow can be used for the processes of splitting droplets and bubbles in a continuous liquid phase, since this creates favorable conditions - significant amplitudes of pressure, speed and acceleration at a frequency of about dozens of Hertz.
Modelling viscous fluid filtration to select optimal bottom-hole filter designs
Authors: Soloviev N N , Khabibullin M Ya 
Published: February 2021

Abstract
Determining the resistance value of filters with a filtering surface of mesh and block type is difficult mathematically. This is because many parameters affecting the shell filtration capacity. As for the mesh filters, depending on the type of weaving, the different thickness of weft and warp, the different size in the horizontal and vertical planes, the frame structure which is integral with the mesh have critical influence. As for block constructions, it is the size and uniformity of the composition of the particles, the thickness of the filter shell, the geometry of the filtration channels and other features that play the role. It is, therefore, more convenient for such filters to assess their permeability. The most promising filters are the frames with horizontal slots which have considerably less resistance and interference of the holes. In addition, the features of the frame-rod filter device make it easy to realize a greater inlet area than in other designs, with the same minimum size of the slots. Recommendations for choosing the inlet areas and the size of the filter slots should consider factors related to well production rate, the formation fluid viscosity, particle size distribution of the formations, granulometric composition of the formation, consolidation factor of the bottom-hole zone, clodding and bridging of the deposits.
Enhancement of efficiency of the hydraulic distributor of the hydraulic drive of the bottom-hole pump
Authors: Suleimanov R I , Khabibullin M Ya 
Published: February 2021

Abstract
The article deals with the hydraulic drive of the bottom-hole pump and analyzes the hydraulic drive operation. The authors outline peculiar failures of the hydraulic distributor of oil system control and suggest a technical solution for efficient operation of a hydraulic distributor designed to redirect the flow of liquids circulating in the hydraulic drive of the bottom-hole pump. The solution allows increasing the inter-repair period and reducing the energy consumption of the hydraulic drive.
Selection and justification of efficiency parameters of a noise-resistant downhole telemetry system
Authors: Tyncherov K T , Mukhametshin V Sh , Rakhimov N 
Published: February 2021

Abstract
The article examines the issue of selecting and justifying efficiency parameters of a noise-resistant downhole telemetry system that measures and transmits borehole information to the surface via an electromagnetic communication channel. The work is devoted to the continuation of research on the synthesis of systems capable of transmitting messages from oil wells equipped with sucker rod pumps from a depth of up to two thousand meters. To ensure noise immunity, coding is proposed in the residual class system with the possibility of error correction in the neural network basis.