bluuebunny/crossref_metadata_2025_split huggingface dataset:
Digital technologies in the economy: opportunities and threats
Authors: Vasil’eva L P , Polyanskaya O A , Khartanovich K V , Milenkiy A V , Tereshchenko S V 
Published: August 2021

Abstract
The article discusses current trends in the development of the newest digital technologies. Their development is an urgent task for the Russian Federation, since they have become the driving force behind the digital transformation of the economy and society. The article describes the components of an individual enterprise profile. Attention is focused on the emergence of the block chain system, the method of big data, expert systems and general decentralization, which is the process of business optimization, in the organizational structure of all industries and spheres of activity. The analysis of factors constraining the process of digital transformation in economic processes has been carried out.
Geotechnological structure of a combined opencast and underground mining method in the condition of integrated development of coal deposits
Authors: Anfyorov B A , Kuznetsova L V 
Published: August 2021

Abstract
A combined opencast-to-underground mining method is widely used for final extraction of border zone coal reserves and extracting areas with limited and non-technological reserves. The idea of the method is that coal is extracted by opencast method and continued by underground mining using highwall mining complex, mobile mining mechanical equipment, augers, mechanized complexes and water jetting facilities.
Monitoring of physical condition changes in strata boreholes during coal mining
Authors: Tailakov O V , Zastrelov D N , Makeev M P , Saltymakov E A , Kolesnichenko S E 
Published: August 2021

Abstract
The approach to determine the length of degasification boreholes by profilometry using echolocation method in mine conditions is substantiated. The results of cameral processing of echograms obtained in field studies are presented. The relationship between the effective length of boreholes and their methane content has been established. The bearing pressure zone influence of on physical condition of horizontal boreholes drilled to undertake strata degasification is shown.
Outburst danger criteria for acoustic prediction methods at the initial and final stages of preparing sudden coal and gas outburst
Authors: Shadrin A V 
Published: August 2021

Abstract
Two stages of preparing coal and gas outburst are studied in the article. At the first stage the cracks which create a coal block structure are being developed ahead of the moving workings in a zone of high rock pressure. At the second stage the crashing of a narrow coal layer in the mouth of starting outburst cavity and its outsqueezing into the workings takes place. The control of cracks development is fulfilled by acoustic emission method. For controlling the rock pressure spectral-acoustic method is applied. The outburst danger criterion of spectral-acoustic method is corrected depending on the coal strength and in-situ pressure and they are estimated according to the methane concentration in the workings atmosphere. The results of outburst danger criteria comparison for different variants of spectral-acoustic method in a form of relation between high frequency and low-frequency amplitudes of the operating equipment “noise” spectrum and in the form of current and critical values of amplitude-frequency characteristic medians of noise are introduced. It is demonstrated that a crack development criterion and the criterion of a coal layer outsqueezing coincide if there is no gas in a coal seam. With the increasing of methane concentration at the face the crack development criteria decrease much faster than outsqueezing criterion. It is concluded that the result of the outburst danger prediction made by acoustic emission method is a necessary but not sufficient condition for initiating the outburst. The prediction, made by acoustic emission method supplemented by controlling methane concentration and coal strength allows estimating outburst danger within the whole process of outburst preparation.
Regional features of the influence of inter-fuel competition on energy consumption
Authors: Yu Nemov V , Filimonova I V , Provornaya I V , Komarova A V , Chebotareva A V 
Published: August 2021

Abstract
The article analyzes the main stages of the formation of inter-fuel competition. A statistical analysis of changes in the fuel and energy balance at the global and regional levels has been performed. The key factors contributing to inter-fuel competition at the present stage of development of energy markets are highlighted.
Selection of a structure of jaw crusher regulator
Authors: Nikitin A G , Tagiltsev-Galeta K V , Laktionov S A , Fastykovskii A R 
Published: August 2021

Abstract
To control a crushing machine at various industrial enterprises, including the mining industry, different types of typical regulators are used. It should be taken into account that a modern jaw crushing machine is not only an element of a crushing and screening complex, but it is also a system in itself. Realizations of various typical regulators for the electrical protection subsystem are shown.
Study of hydrogen concentration in the weld seam during welding of mining equipment
Authors: Usoltsev A A , Kozyrev N A , Mikhno A R , Kryukov R E , Ya V , sellermayer T 
Published: August 2021

Abstract
The study of the hydrogen content in the weld during the welding of mining equipment was carried out. It was found that with an increase in current strength, voltage and welding rate, a decrease in the hydrogen concentration in the welded joint of the samples is possible. The obtained welded samples meet the requirements for the hydrogen content – the hydrogen concentration in all samples is less than 2 cm3/100g.
Numerical study of the influence of rock massif heterogeneity on its geomechanical state in the vicinity of mine workings for substantiating the underground coal mining digitalization
Authors: Pavlova L D , Fryanov V N , Eremin M O 
Published: August 2021

Abstract
Based on the results of a numerical experiment, the patterns of stress-strain state distribution of inhomogeneous rock massif in the vicinity of a worked-out area and development working, protected by a coal pillar, were revealed.
Numerical modeling of the geomassif stress-strain state with account of different rock resistance to tension or compression
Authors: Tsvetkov A B 
Published: August 2021

Abstract
The results of numerical modeling of the stress-strain state of the geomassif under the influence of natural technogenic forces are presented. To carry out computational experiments, a mathematical model was developed, in the constitutive relations of which the nonlinear relationship between stresses and deformations of rocks and their different resistance to tension or compression are taken into account. A computer program was developed, and an example is given in which the results of a nonlinear solution and a boundary value problem of the theory of elasticity are compared.
Algorithmization of control processes of a hoisting unit induction motor with adjustable resistances in the rotor
Authors: Yu Ostrovlyanchik V , Kubarev V A , Yu Popolzin I , Marshev D A 
Published: August 2021

Abstract
The induction electric drive with a rotary station, despite its shortcomings, is still widely used for existing lifting installations. One of the ways to modernize these electric drives is the transition to a digital control system. The article presents a mathematical model of an induction motor when regulating resistances in the rotor circuit. A mathematical model of a logical control system is proposed and an algorithmic structure of a digital logical control system is drawn up, which allows problems of implementing these control systems to be solved.
Mathematical models based analysis of the efficiency of joint processing of pulverized coal and metallurgical waste using a melting gasifier
Authors: Tsymbal V P , Rybenko I A , Sechenov P A , Rybushkin A A , Kalashnikov S N 
Published: August 2021

Abstract
The paper presents options for almost waste-free technologies for joint and separate processing of pulverized metallurgical and coal waste based on a jet-emulsion melting gasifier with obtainment of three liquid products. The results of mathematical modeling are presented, technological modes and main design parameters of the units are determined.
Soil and ecological state of reclaimed sites with the use of waste coal
Authors: Semina I S , Androkhanov V A , Kulyapina E D 
Published: August 2021

Abstract
The results of the survey of reclaimed areas with waste coal are presented. The assessment of the soil and ecological state showed that the restoration of disturbed lands in the areas of reclamation with the formation of a geological substrate from waste coal and bulk root inhabited horizons allows a stable vegetation cover on the reclaimed surface to be formed and waste coal to be used for reclamation purposes in a environmentally safe way.
Construction of polar fronts of reactions in gas-air flows of mine workings near the centers of self-heating
Authors: Cherdantsev S V , Shlapakov P A , Lebedev K S , Erastov A Yu , Khaymin S A , Shlapakov E A , Kolykhalov V V 
Published: August 2021

Abstract
Gas and thermodynamic phenomena often occur during the operation of coal plants, especially at deep horizons. These are sudden emissions of coal and gas, deflagration and detonation processes in gas and dust-gas-air mixtures that generate explosions and shock waves in the atmosphere of mining operations, which are complex movements of a continuous medium containing strong rips. The peculiarity of these movements is that for their theoretical study, it is necessary to take into account not only the fundamental laws of continuum mechanics, but also the basic provisions of thermodynamics and thermophysics. This article considers a mathematical model of a stationary oblique reaction front based on the laws of conservation of mass, momentum, and energy, assuming that the gas-air flow in which the reaction occurs is an ideal gas whose flow is stationary. Formulas are obtained and polars of reaction fronts are constructed, both in supersonic and subsonic gas-air flows in the atmosphere of mine workings. Based on the analysis of the constructed polars, a number of regularities of reactions in oblique fronts at different Mach and Damkeler numbers have been established.
Dismantling of the powered complex using a dismantling shield in the conditions of Southern Kuzbass mines
Authors: Nikitina A M , Rib S V , Borzykh D M , Dadynsky R A 
Published: August 2021

AbstractThe experience of works on dismantling powered coal face systems at the mines of Kuzbass and the USA is discussed. The factors influencing the duration of dismantling of powered complexes are determined. Based on the experience of dismantling works, a scheme with a polymer mesh canopies and pilot sections of powered mining complexes with the formation of a chamber by a face has become widespread. To reduce the time for dismantling works, a technology with the use of dismantling shield (two “pilot” sections connected by an E-frame), which allows the minimum possible time for reassembly of the coal face system equipment to be achieved.
Development of a control system for the technological complex of “Mine No. 12” processing plant based on the Wonderware System Platform 2017
Authors: Grachev V V , Myshlyaev L P , Lyakhovets M V , Ivushkin K A , Makarov G V 
Published: August 2021

Abstract
The article is devoted to the peculiarities of creating an automation system for the technological complex control of “Mine No. 12” processing plant based on the Wonderware System Platform 2017. The hardware and software of the system are described, the key points and features of the use of the Wonderware System Platform 2017 are given, which made it possible to reduce labor costs during development and to increase efficiency during system operation.
The effect of structural aspect for planar systems with 2DOF upon the stability of motion
Authors: Alaci S , Ciornei F-C , Suciu C-C , Romanu I-C 
Published: August 2021

Abstract
The paper analyses all planar chains with 2DOF from the point of view of stability of motion. For the rotation-prismatic structural solution first there are obtained the equations of motion and then, the numerical integration procedure is applied. A strong instability of the system can be noticed. The same dynamical system is modelled using dynamical analysis software and the instability is confirmed.
Quality improvement of the primary cable of the handbrake lever: a QFD approach
Authors: Baban C F , Baban M , Popi I S 
Published: August 2021

Abstract
Quality function deployment is one of the most used tools for the quality improvement of products or services. According to the literature, manufacturing is one of the industries that has benefited most from its employment. Therefore, the purpose of this paper is to illustrate the usability of the quality function deployment in improving the quality of the primary cable of the handbrake lever. In this way, the technical priorities of this product were established by comparison with those of the main competitors in the market and the target values of each technical characteristic of the product were determined. In addition, the attention of the manufacturer of the primary cable of the handbrake lever can be also focused on the fulfillment of the customer expectations.
Designing a vacuum chamber and substrate positioning system for magnetron sputtering deposition applications
Authors: Tarcă D.I. , Ghincu R.V. , Crăciun D. 
Published: August 2021

Abstract
A new custom vacuum chamber with a substrate positioning system in our SMARTMAT laboratory is needed, as the previous one that we installed did not suit our needs. Based on our experiences with the old sputtering system, we designed a smaller vacuum chamber that could be attached to our existing load-lock system, and that could have a substrate positioning system suited for our magnetrons which would work with the load-lock. The new system replicates our initial experiments and is compatible with our experimental data acquisition system. We mounted the sensors and vacuum equipment on the chamber, and initial vacuum tests were a success, which validated our design.
Agile, waterfall and iterative approach in information technology projects
Authors: Fagarasan C , Popa O , Pisla A , Cristea C 
Published: August 2021

Abstract
The aim of this paper is to analyse the Agile methods implementation capability within software projects as a more viable alternative to the waterfall model and determine the key factors that guarantee the continuous delivery of software to market at the right and agreed quality level. Two Agile implementation methods were considered: Scrum and Kanban, which were evaluated based on factors like predictability, practicability and complexity. The conclusions show the selected methodologies advantages and disadvantages, and project key attributes can be used to choose the suitable methodology for a project. Regarding the Agile implementation methods, the most straightforward and predictable one was proven to be Scrum. This framework supports frequent delivery of software products that can address complex problems and adapt to the rapid market changes.
Parametric study of air-cooled TEG heat exchanger design for waste heat recovery in heavy-duty vehicle
Authors: Burnete NV , Mariasiu F , Moldovanu D , Burnete N , Capata D , Jurchis B 
Published: August 2021

Abstract
This study focuses on the influence of different heat exchanger (HX) design parameters like the fin height, fin number, and fin thickness on the performance of an air-cooled exhaust gas thermoelectric generator (TEG). The TEG is considered to be installed on a heavy-duty truck traveling at 85 km/h on the highway thus ensuring the required cooling air for the cold side HX. It was found that the number of fins has the highest influence on the amount of extracted heat and power output of the system, but it also negatively affects the pressure drop. Increasing the fin height improves the pressure drop, but the performance increase is limited. Similarly, increasing the fin thickness provides only limited output improvements, but it also affects the pressure drop. Finally, compared to the hot side HX, the cold side HX has a limited influence on TEG output, but its design is not restricted by the pressure drop.
Researching Diesel car CO2 emissions in cold and warm-up transient test cycle
Authors: Andrei L , Chindea V , Băldean D L 
Published: August 2021

Abstract
Research of CO2 emissions is not only important, but it is standard practice for homologation, technical inspections, registration of vehicles and for environmental greenhouse effect. Different agencies are taking into consideration the fact that greenhouse emissions are seriously impacting the climate change and events on the planet. Road traffic and transportation are, beside animal agriculture, the most significant polluters in dense areas, with high values of emissions. For diminishing the impact of automotive sector in the emissions field, the present work approaches the practical side of this topic. During the testing, some results will allow the definition of those conditions in which the pollutant emissions fall into control and are drastically diminished. Main objective of the paper is to research the CO2 emissions generated by a Diesel engine in a transient test cycle, both at cold operation and after warm-up phase. Second objective is to analyse the graphics from low speed and medium speed operation regimes. The CO2 emission are influenced by fuel consumption, engine speed and coolant temperature. Highway testing of CO2 emissions are to be made in further and advanced research.
Enhancing Productivity of CNC Machines by Total Productive Maintenance (TPM) implementation. A Case Study
Authors: Gherghea I C , Bungau C , Indre C I , Negrau D C 
Published: August 2021

Abstract
Lean manufacturing is a business system that contributes to the growth of production efficiency and the company profit, by identifying and eliminating waste. TPM is one of the techniques used to eliminate production waste, being focused on the maintenance of production equipment, so as to increase their operation and efficiency, while ensuring the quality of production due to preventing the causes that lead to waste. In the present paper for the continuous improvement of the manufacturing process within the work cells equipped with CNC processing centers, TPM is implemented, which contributes to the optimization of predictive, preventive and corrective maintenance activities of production equipment, thus improving the efficiency of machine tools. TPM ensures maximum equipment efficiency due to the elimination of unforeseen equipment downtime, respectively increasing the speed and availability of the machine. The research is based on a case study from automotive industry. Monitoring the daily activities of the equipment is done through the TPM component, namely Overall Equipment Effectiveness (OEE) which presents the situation in the manufacturing process. The waste related to technological equipment were identified, such as: incorrect operation of the work equipment, unplanned shutdowns, respectively damages that occurred in the manufacturing process.
Designing and building a remote-controlled 3D printed prototype robot arm implant
Authors: Török M , Erdei T I , Tóth Sz , Husi G 
Published: August 2021

Abstract
The basis of this projects are robot arms, and within that topic, implants. This area of science belongs to mechatronics, or more precisely, bionics. The goal of this project was to build and remotely control a 3D printed robot arm implant. The robot arm itself was printed with a custom-built 3D printer using biodegradable materials. The completed implant allows interaction with other physical objects using remote control. This allows to lower direct physical interactions during a pandemic or allow work in an environment where an operator could not stay for a long period of time without health risks.
Applications of nonconventional technologies in the current global pandemic
Authors: Veres R , Ilea S , Feier B C , Veres G , Corb F 
Published: August 2021

Abstract
Starting from the first part of the previous year, the mankind faced a very unusual challenge. Starting with the spread of an animal-based virus found in the exotic food markets in Wuhan Province, China, the SARS-COV-2 virus quickly began to spread on a global basis on the entire planet. With such a high contagiousness it was only a matter of time till the virus made its presence in the countries all over the world, infecting many people and, unfortunately, rising the death toll every day. Based on this situation, a global pandemic was instituted by the World Health Organization resulting many restrictions and rising many problems for the medical systems all around the world. In this paper we would like to present some of the applications of modern technologies that helped, in way or another, in the fight against the pandemic, b eing sometimes a helping hand in the global fight against this virus.
Shielding parameters for cobalt free steel alloys
Authors: Mourad M M , saudi H A , Eissa M M , Hassaan M Y , A Abdel-Latif M 
Published: August 2021

Abstract
Steel alloys are widely used for radiation shielding in nuclear applications since Cobalt is an expensive element, this leads to the steels is may be expensive, so it is preventing wider application and selection. So the important direction of this research is preparing cobalt-free maraging stainless steel as shielding to reduce the production cost. Therefore, seven different free-cobalt steel alloys were prepared by using an electro slag re-melting technique. Steel compound ratios were calculated by using the software WinXCOM program for Monte Carlo simulation, at energies of photon 662, 1173 and 1332 keV. The attenuation properties of these alloys were studied. Furthermore, the total of removal macroscopic cross-section, transmission number and mean free path were determined using Geant4 code for fast neutrons radiation shielding. Therefore, shielding parameter variations are applied to the steel alloys to investigate the superior shielding properties to gamma rays than other materials.
Effects of Cr content on the corrosion behavior of porous Ni–Cr–Mo–Cu alloys in H3PO4 solution
Authors: Yang Junsheng , Zou Haoran , Li Xide , Chen Junxiao , Lv Li , Wen Yi , Fan Yiquan , Xiong Lieqiang , Liu Yuzuo 
Published: August 2021

Abstract
Porous Ni–Cr–Mo–Cu alloys were prepared via reaction synthesis of mixed powders. Electrochemical performance test and weight-loss method were used to evaluate the effects of chromium content in the range of 10 ∼ 30 wt% on the alloys corrosion performance in 30 wt% H3PO4 solution. The microstructure, element valence and phase composition of the porous Ni–Cr–Mo–Cu alloys were characterized via scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and x-ray diffraction analysis (XRD), respectively. And the results show that the alloys exhibited serviceable corrosion performance and the corrosion behavior was better than that of pure Ni and Cu. Incremental changes in the chromium contents within a certain range enhanced the corrosion resistance of the alloys. These alloys with 30 wt% chromium exhibited excellent anti-corrosion ability in the H3PO4 solution. The electrochemical test displayed that the double capacitive loops of the alloys in the H3PO4 solution increased with the chromium content; at chromium content of 30 wt%, the charge transfer resistance and activation energy were 1123 Ω and 74.10 kJ mol−1, respectively. The possible corrosion-inhibition mechanism was examined by XPS, which may be owing to the formation of MoO
x
(x = 1, 2, 3) and Cr2O3 passivation layers in the H3PO4 solution, which prevent further corrosion in acid environments.