bluuebunny/crossref_metadata_2025_split huggingface dataset:
Details of mining beneficiation equipment made of medium manganese wear-resistant steel
Authors: Snizhnoi Hennadii , Sazhnev Volodymyr , Snizhnoi Valentyn , Mukhachev Anatoliy 
Published: June 2024

Abstract
For mining and beneficiation equipment, medium-manganese steel for the production of fast-wearing replaceable parts is proposed. The object of research was the effect of phosphorus on the physical and mechanical properties of austenitic manganese steels with a manganese concentration within the standard for steel 110G13L and below the regulated lower level. Phosphorus more significantly reduces impact toughness, relative elongation and relative narrowing in steels with a lower manganese content than in classic Hadfield steel. In steels with a reduced manganese content, phosphorus has a less effective influences on the tensile strength, and it has practically no effect on hardness. Reducing the phosphorus concentration to 0.025 % and below in 110G8L steel increases its main physical and mechanical properties to the level of 110G10L steel with high phosphorus (recommended for parts subject to abrasive wear). The use of 110G8LA steel with low phosphorus reduces to further reduce the costs of manganese ferroalloys in the production of fast-wearing replaceable parts of mining and beneficiation equipment. This also reduces the emission of manganese compounds with oxygen into the atmosphere, which is very harmful to the environment and the human body.
Numerical study of time-dependent stresses in the floor of the stope with powered support
Authors: Krukovskyi Oleksandr , Krukovska Viktoriia , Kostrytsia Andrii 
Published: June 2024

Abstract
When sections of the powered support are clamped in the stope, one of the ways to move them is to explode the rock under them. In the case when there is outburst-prone sandstone in the seam floor, blasting operations becomes dangerous and it is necessary to study the stress field in the host rocks. In this work, a numerical study of the time-dependent stress field in the floor of the stope with powered support is performed. Distributions of values of geomechanical parameters characterizing the stress field and zones of inelastic deformations at different time steps are given. Graphs of changes in these parameters in the floor of the stope are plotted. The minimum time for unloading sandstone at the place of drilling the hole for explosive charge is calculated. It is shown that in front of the mine face plane, the sandstone in the seam floor is in a uniform compressed state; all components of the stress field are close to unity. However, they start to decrease already 2.5 m before the mine face plane. At the hole drilling site, the maximum stress is 0.77γH, the minimum stress is 0.35γH at a depth of 1 m for given conditions.
Comparison of the reliability of strength limit calculation methods for prismatic samples with different spreading of normal contact stresses in their wedge failure shape
Authors: Vasyliev Leonid , Vasyliev Dmytro , Malich Mykola , Rizo Zakhar , Kress Denys 
Published: June 2024

Abstract
This article explores methods for calculating the strength limits of solid objects subjected to compression. Traditionally, two stress distribution patterns are used: the exponential pattern by E.P. Unksov and the linear pattern by L. Prandtl. The authors introduce an enhanced stress distribution method. They compare the accuracy of these methods in calculating strength limits and constructing “normal stress - longitudinal strain” diagrams for wedge-shaped failures in rock samples. Four properties are considered: shear strength, coefficients of internal and external friction, and elasticity modulus. The results show that, with an external friction coefficient up to 0.3, all methods yield similar accuracy in strength limit calculations and ultimate stress-strain curves. Some curves exhibit stress drops, explained by a transition from convex to concave slip lines during failure. Additionally, there are hardening curves in the ultimate curves without theoretical justification. The comparison of calculated strength limits with experimental data confirms the method’s accuracy: 13.7% error for the exponential method, 11.4% for the linear method, and 8.1% for the enhanced distribution, especially for low contact friction values (up to f
c=0.3).
Prompt determination of predictive parameters for mining-technogenic landscape objects
Authors: Petlovanyi Mykhailo , Ruskykh Vladyslav , Sai Kateryna , Malashkevych Dmytro 
Published: June 2024

Abstract
The presented research is aimed at developing tools for quickly determining the geometric parameters of mining-technogenic landscape objects to solve various geotechnical and engineering problems, such as reclamation of lands disturbed by mining operations, as well as accumulated industrial waste utilization. The task of quickly determining the geometric parameters of the mining-technogenic landscape forms is proposed to be performed using the Blender software product for 3D-modeling and the Blender GIS Addon. The 3D models for mining-technogenic landscape objects have been constructed. In addition, the volumes of mined-out space at the granite quarry, the earth’s surface failure zone at the iron-ore mine and the mine waste rock dump have been determined. As a result, the values obtained were compared with actual data. It has been found that with the correct display of mining-technogenic landscape objects in the Google geospatial system, the proposed tools based on the Blender GIS Addon achieve high accuracy in determining parameters. The proposed method is predictive and cannot be independent, and it must be used in synthesis with surveying measurements of the parameters for mining-technogenic landscape objects and is a kind of a certain addition. However, it allows solving large-scale strategic problems in geoengineering.
Ways to reduce the risk of emergencies on belt conveyors operating in mining enterprises
Authors: Kiriia Ruslan , Smirnov Andrii , Mostovyi Borys , Mishchenko Tamara , Novikov Leonid 
Published: June 2024

Abstract
Since the majority of emergencies on belt conveyors of mining enterprises are associated with the conveyor framework, the article considers the failures of its elements - roller supports. The process of functioning of the framework is presented as a Markovian process of death and reproduction for a system of n parallel connected elements (roller supports) with intensity of failure and recovery λ
r and μ
r, respectively. The maximum permissible number of non-working roller supports, as well as the required number of roller supports replacement per shift to prevent an emergency on the conveyor, are determined. The value of the risk of conveyor framework failure K was also determined. Thus, for the given operating conditions, load flow characteristics and conveyor parameters, it is possible to calculate the maintenance intensity at which the risk of an emergency is minimal. This allows for efficient planning of belt inspections and repairs. To eliminate the risk of emergencies a patent-pending method for monitoring the technical condition of a belt conveyor framework by automatically monitoring the number of idle rollers on the framework has been developed. This prevents accidents caused by belt breakage and fire, as well as loss of traction of the conveyor drive.
Improving the efficiency of gear grinding technology for mine conveyor drives
Authors: Novikov Fedir , Polyanskyy Volodymyr , Yermolenko Oleksiy , Ivashura Andrii , Yermolenko Oksana 
Published: June 2024

Abstract
The aim of this work is to develop a mathematical model of the gear grinding process using the method of high-performance profile copying and determine the optimal parameters of grinding modes according to the temperature criterion. It is shown that in order to ensure defect-free machining of gears under deep grinding conditions, it is necessary to significantly reduce the rate of the feed speed of the grinding wheel along the tooth of the gear wheel. For a grinding depth of 0.4 mm, it should be equal to 2.27 m/min. In this case, the machining productivity can be increased up to 5 times with the simultaneous elimination of the formation of sticking, microcracks and other temperature defects on the machined gear surfaces. This processing effect is achieved by using a modern HOFLER RAPID 1250 gear grinding machine and highly porous abrasive wheels, which are characterized by high cutting capacity. Thanks to the improved quality of gear processing, the quality and performance of manufactured mine conveyor drives (planetary gearboxes with a power of more than 200 kW) have been improved, and the number of repairs required in harsh mine conditions has been significantly reduced.
Increasing the underground coal gasification efficiency using preliminary electromagnetic coal mass heating
Authors: Lozynskyi Vasyl , Falshtynskyi Volodymyr , Kozhantov Arystan , Kieush Lina , Saik Pavlo 
Published: June 2024

Abstract
The purpose of this research is to explore the possibilities of using a high-frequency electromagnetic field for heating coal seams in the context of underground coal gasification. The research is based on mathematical models that take into account the physical parameters of the electromagnetic field. The methodology includes the calculation of thermal powers, exposure duration, temperature profiles and reaction rates. The research results indicate significant potential for using high-frequency electromagnetic field for coal seam pre-heating. Possibilities of using a high-frequency electromagnetic field for heating the mass in the context of underground coal gasification have been explored. The mathematical models developed and calculations performed broaden the understanding of heating processes in such systems. It has been determined that field parameters, such as frequency and power, influence the heating efficiency and temperature distribution. The obtained scientific results present new opportunities to increase the efficiency of underground coal gasification as an alternative energy source and will contribute to achieving a more efficient and sustainable future energy supply. The use of a high-frequency electromagnetic field can be useful when gasifying low-grade or low-thickness coal seams, when there is a need to intensify the gasification process.
The performance analysis of deep learning algorithms for modelling and forecasting the particulate matter (PM10) in the eastern part of Turkey
Authors: Batur Maryna , Babii Kateryna 
Published: June 2024

Abstract
The main purpose of this study is to select the most reliable nonlinear computational model to predict the particulate matter (PM10) concentrations. Time series data of three years PM10 concentrations were used as input variable. For the prediction, three different types of dynamic nonlinear autoregressive models were built and compared. These models are the Levenberg-Marquardt algorithm, the Bayesian Regulization algorithm, and the Scaled Conjugate Gradient algorithm. For each of these algorythms, various settings were adopted with the subsequent statistical analysis. To analyse the model performance, we used mean prediction error, root mean square error, and correlation coefficient. The lowest root mean square errors were found for the Levenberg-Marquardt algorithm with 15 neurons, for the Bayesian Regularization and for the Scaled Conjugate Gradient algorithm with 20 neurons in hidden layer. In our study, we focused on the long-term forecast of stationary dynamic time series data and on the large amount of data, which is presented as a scientific novelty. Additionally, we determined the main model parameters that most improve quality in terms of training and network capacity. Therefore, the derived forecasting model can be used as a priori for air quality management and regulations aimed on the reducing of pollutant level.
Interchangeability of various combustible gases and adaptation of gas-using equipment for their efficient combustion
Authors: Kolienko Anatolii , Ahmednabiev Rasul , Demchenko Oksana , Hukasian Olha , Semko Volodymyr 
Published: June 2024

Abstract
The article presents the results of studies, the purpose of which is to substantiate the possibility of using a wide class of different combustible gases in one gas-using equipment and to develop recommendations for changing the design and operational parameters of such gas-using equipment in the event of a transition from one type of non-interchangeable combustible gases to another. The methodology of the work is based on a critical analysis of the available data on the issue of interchangeability of combustible gases, as well as our own theoretical and experimental studies. Dependencies have been obtained that permit to determine the possibility of switching gas-using equipment from one type of gas to another. Recommendations have been developed on the permissible content of hydrogen in a mixture with natural gas, ensuring the efficient, safe and environmentally friendly use of such fuel in household and industrial heating devices. Scientific and practical results of the work permit to carry out a low-cost reconstruction of gas-using equipment from one gas to another, including the transition to combustible gas containing hydrogen.
Utilization of phosphogypsum from industrial dumps as an element of environmentally safe energy- and resource-conserving technologies
Authors: Pikarenia Dmytro , Orlinska Olha , Hapich Hennadii , Rudakov Leonid , Chushkina Iryna , Mazurenko Roman 
Published: June 2024

Abstract
The paper discusses the problem of disposal and processing of phosphogypsum dumps as an element of environmentally safe energy- and resource-conserving technologies. The process of impact and possibility of phosphogypsum pre-treatment with weak electric fields to improve its physical and mechanical properties was studied. Two samples of different origin phosphogypsum, which are located in dumps on the territory of the Kamianske City (Ukraine), were used as research material. The research was conducted on samples of the following fractions: 1.0–2.0, 0.4–1.0, 0.1–0.4 mm. Further, balls were formed from the treated phosphogypsum and raw materials to study their compressive strength. The experiment was performed on a pellet strength meter, which operates in the range of 0–2.5 kgf/grain. Phosphogypsum balls, treated with electric current, did not collapse with the maximum values of the device. According to the research results, it was established that preliminary treatment with a low electric current leads to a decrease in the dehydration temperature of phosphogypsum, and the subsequent hydration allows to obtain a material with higher compressive strength properties. This substantiates the potential possibility of involving research results to obtain a cheaper product and will allow to liquidate multi-ton deposits of phosphogypsum.
The durability increasing of high-wear cast parts of mining and processing equipment
Authors: Shalomeev Vadim , Brykov Mykhailo , Sheiko Serhii , Matiukhin Anton , Yepishkin Oleksandr , Kulabnieva Olena , Tytov Oleksandr 
Published: June 2024

Abstract
The analysis of the operation of rapidly wearing parts of the ore-grinding equipment was carried out. It has been established that unloading grates and ladles are fast-wearing parts of layered fracture mills and determine their downtime between repairs. The possibility of improving the mechanical properties of medium-carbon steel 40HL due to the reduction of harmful impurities is shown. The effects of modification with aluminum, vanadium, calcium, and rare earth metals on structural formation, mechanical, and operational properties of steel are investigated. It was established that the complex modification of cast steel 40HL (0.04…0.1% vanadium, 0.15% silicon calcium and 0.15% rare earth metals) allows to significantly increase its mechanical properties and wear resistance. The separate and joint influence of aluminum, vanadium, calcium and rare metals on the austenite grain size and hardening of steel was studied. The proposed modification technology makes it possible to obtain a fine grain, through-hardening of castings and ensure reliable and long-lasting operation of ball mills.
A new method of oil and water well completion involving the implosion effect
Authors: Chudyk Ihor , Biletskiy Marian , Ratov Boranbay , Sudakov Andrii , Borash Ardak 
Published: June 2024

Abstract
Features of colmatation zones of a productive formation in terms of rotary drilling by drilling muds are considered. A brief analysis of the most popular decolmatation methods is performed. Special attention is paid to the decolmatation method involving implosion effect. An example of one of the existing installations is represented with following consideration of its application features. A new principally different installation, free from the disadvantages found in the available one, is considered; a patent for the installation is obtained in Kazakhstan. It does not involve tubing with its packer and wellhead sealing. It also does not require a compressor and its manifold. Characteristic features of the newly developed installation for creating implosion effect are represented; its operation at producing both single and any number of repeated implosion acts is examined. A mathematical analysis is performed to calculate the empty space limits required for the implosion effect by a criterion to prevent casing string collapse by hydrostatic pressure of the drilling mud remained in the annular space. An example of dependency of the maximum permitted length of empty space in the casing string on its mechanical strength and its wall thickness, calculated by means of a computer program, is represented.
Methods of finding and developing underground water resources
Authors: Zmiievska Kristina , Zmiievskyi Artur 
Published: June 2024

Abstract
The paper presents the methods of finding for underground water resources using the observation method of the natural impulsive electromagnetic field of the Earth and substantiates the technology of drilling water wells using the down-the-hole drilling method. The most promising sources for extracting of high-quality drinking water, namely fractured water, are considered. It is shown that these methods can be applied in mining areas with an open type of mineral development in the crystalline rocks of the Ukrainian Shield, given the strength of the rocks in geological fault zones, which exceeds f=10 on Professor Protodyakonov’s scale. Previously, water resources in such collector formations were not considered promising due to the difficulty of drilling. The flow rate for water is directly proportional to the final diameter of the drilling wells, that is, the larger the final diameter of the well, the larger the diameter of the filtration column that can be installed, and the greater the discharge that can be obtained. Therefore, equipment with diameters of 200 mm and larger is used for water wells construction.
The use of secondary heat resources during the accumulation of compressed air in closed mining workings
Authors: Kirsanov Mykhailo , Slobodiannykova Inna , Gupalo Olena , Podoliak Kostiantyn 
Published: June 2024

Abstract
The article considers the possibility of energy accumulation in mining workings in order to reduce the consumption of fossil organic fuel by the mining enterprise itself. For this purpose, the authors propose to accumulate compressed air in closed mine workings using secondary heat resources to generate additional electricity. The energy management of mining enterprises can be equipped with freon steam turbines which implement the Rankine thermodynamic cycle to obtain additional electricity from secondary heat. To measure the efficiency of the process, the air mast be compressed isothermally. The compression must be carried out in several stages, and the air must be cooled after each stage. Taking into account the development of energy storage technologies in the form of compressed air in specially prepared closed mining workings, the required air pressure can be from 70 to 90 at. The article assesses the possibility of using a secondary heat resource during air compression at mining enterprises. It is shown that the use of freon steam turbines during the accumulation of compressed air in underground pressure accumulators increases the subsequent production of electricity during the operation of the air turbine by 7.6% during the day.
Signs of dynamic nonlinearity of the coal dielectrics depolarization upon excitation in electric and magnetic field
Authors: Balalaiev Oleksandr , Burchak Oleksandr , Sierikov Yurii , Baranovskyi Volodymyr 
Published: June 2024

Abstract
The authors conducted a series of experiments on samples treated immediately before measurements with a constant magnetic field of a neodymium magnet and/or an alternating electric field. The experiment has shown complex dynamics of electric potential with alternating polarity relative to the base exponential depolarization curve. The variety of responses to different types of excitation, and the irregular and unpredictable nature of fluctuations suggest that these are varieties of the same phenomenon – the nonlinear dynamics of ferroelectric domains. The applied methods of statistical processing of the cumulative data array suggest that the invariance of the relaxation dynamics of the accumulated electric potential after excitation can be characterized by three related nonlinear differential equations of the first order. The impact of an alternating electric field may consist in bringing the dipoles of ferroelectric domains in the molecular coal structure into a state of unstable equilibrium with their slow return to their original position. The impact of a constant magnetic field is determined by the interaction of the external magnetic field with the magnetization induced due to time-varying electric polarization. In any case, the observed fluctuations are due to changes in the domain structure topology of the condenser with coal matter.
Amplification effects of ground motion due to the local geology of the building site in the cities of Kyiv, Kryvyi Rih, Odesa
Authors: Pigulevskiy Petro , Semenova Yuliia , Lisovyi Yurii , Kendzera Oleksandr , Kravets Serhii 
Published: June 2024

Abstract
The results of the research presented in the article elucidate the importance of taking into account the amplitude-frequency characteristics of soil stratum models in the context of seismic safety of construction objects on the territory of Ukraine, in different regions. The presented results of the analysis of the calculated amplitude-frequency characteristics of models of soil environments for different regions of Ukraine reveal that the amplification of vibrations by soils has a complex nature that depends on many factors and can differ significantly for different construction sites. We have shown that during the earthquake-resistant design of buildings and structures, it is necessary to properly take into account the properties of soil complexes under the research site, which can significantly increase oscillations at “resonant” frequencies. The article examines in detail the features of amplitude-frequency characteristic models of soil strata for different geological conditions in Kyiv, Kryvyi Rih and Odesa. The purpose of this study is to compare these characteristics and develop recommendations for reducing risks associated with seismic hazards.
Tunable atomic spontaneous radiation in cylindrical waveguide
Authors: Liu Yu-Wei , Zhao Li-Ming , Zhou Yun-Song 
Published: June 2024

Abstract
The chiral interaction between light and matter has brought chiral quantum optics into a flourishing stage. Here, we explore the perfect chiral interaction between the atoms with elliptically polarized dipoles and waveguide modes, and find that ideal unidirectional radiation can be obtained by adjusting the position and polarization of atoms. When there are two waveguide modes in the system, by controlling the polarization of the dipoles, the dipoles can radiate not only the unidirectional single waveguide mode, but also two seperated waveguide modes.