bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessing the stability of underground workings in urban infrastructure
Authors: Shapoval Volodymyr , Shashenko Oleksandr , Morklianyk Bohdan , Skobenko Oleksandr , Barsukova Sofiia 
Published: June 2024

Abstract
This article presents the analytical formulas necessary for making optimal design and technological decisions when laying shallow underground mine workings. They make it possible to determine the following critical parameters of mine workings: the critical height of the lift of the arch of natural equilibrium is the surface above which the rock is in an undestroyed state; stability coefficient of the arch of natural equilibrium (it shows in what state the rock above the excavation is); critical rock pressure is the pressure that, if exceeded, causes the rock to collapse above the working without support; critical depth of the mine working; critical pressure in the pore fluid is the pressure above which the rock collapse above the working without support; design maximum rock pressure with a given safety factor; design maximum depth of the working with a given safety factor; rock pressure on the support.
Physical and chemical characteristics of the composite material Zeolite-Alginate-Fe(OH)3
Authors: Frolova Liliia , Pasenko Oleksandr , Tiapkin Oleh , Kashkalda Natalia 
Published: June 2024

Abstract
The article examines the physical and chemical properties of Zeolite-Alginate-Fe(OH)3 granules, which were synthesized by applying iron hydroxide to alginate-zeolite granules. In the work, the process of synthesis and granulation of Alginate-Zeolite-Fe(OH)3 adsorbent was investigated. The process of application of the active magnetic phase of the adsorbent was studied. The dependence of the static strength of the granules on the content of the solid phase (43 - 51 kPa) was established. Adsorption of lead cations from aqueous solutions was investigated. For the Zeolite-Alginate-Fe(OH)3 adsorbent, the specific adsorption capacity was 13.195 mg/g. It was established that the addition of trilon B in the synthesis process leads to an increase in adsorption capacity by 40%.
Rationalizing the selection of cleaning solution type through quantum chemical calculations
Authors: Nechytailo Mykola , Nahorna Olena , Nesterova Olena 
Published: June 2024

Abstract
The surface water sources for water supply are contaminated with substances that cause water discoloration. These substances include soluble humic and fulvic acids, which are retained on the surface during ultrafiltration membrane treatment, forming a fouling layer that deteriorates membrane performance and reduces membrane productivity. These substances also form a mixed fouling layer with water-soluble metals and coagulants. This work proposes a theoretical justification for cleaning solutions capable of restoring the properties of ultrafiltration membranes. Quantum-chemical calculations and modeling were chosen as the method for prediction and justification. EDTA-Na, SDS, and sodium tripolyphosphate can wash away the fouling layer, but it is impossible to justify the use of mixtures of these substances theoretically. As the quantum-chemical analysis showed, each of these substances has a tendency to wash away the fouling layer. However, it is impossible to justify the use of mixtures of these substances from a theoretical point of view. The pollutants in surface waters have a complex organomineral composition. Considering this, optimal components and concentration ratios of reagents for ultrafiltration membrane cleaning cannot be determined using quantum-chemical prediction methods, so experimental studies of cleaning processes are necessary.
Regularities of subsidence progress in terms of the repeated earth’s surface undermining in the context of Lviv-Volyn coal basin
Authors: Bubnova Olena 
Published: June 2024

Abstract
Study of deformation manifestation within the undermined rock formation and at the earth’s surface is among the key problems during underground mineral mining. The paper has analyzed the available methods identifying the earth’s surface subsidence in the process of its undermining through underground excavation. The analysis has shown branching as well as different approaches and numerous factors. The researchers believe they influence the results. Hence, the purpose is to substantiate regularities of the earth’s surface subsidence while its undermining by means of longwalls varying in their length. The study was carried out using materials of the actual observations on the subsidence in 31 profile lines under the conditions of SE Lvivvuhillia mines. To identify the functional regularities, the factors were assumed which researchers consider as the most influential ones. The performed correlation and regression analysis demonstrated clear relation only for longwall length and moderate relation between subsidence deviation and longwall length-mining depth ratio. A graphical-analytical technique was applied to define distribution of subsidence deviation points depending upon a longwall length-mining depth ratio; moreover, a coefficient was determined to be used while calculating design subsidence values if the longwall length-mining depth ratio is 0.1-0.7.
Mining and geological conditions for the occurrence of sudden gas-dynamic phenomena in the coal mines of the Donets Basin
Authors: Bezruchko Kostiantyn , Vergelska Nataliia , Dedelyanova Kremena , Pymonenko Liudmyla , Vergelska Viktoriia , Sira Nataliia 
Published: June 2024

Abstract
Over a long period in the development of coal deposits in the Donets Basin, a technogenic multi-level system of workings has been created. The increase in the number and power of gas-dynamic phenomena in coal mines occurred in connection with the increase in the working depth and the expansion of coal workings towards the technical limit of the mine field. The characteristics of the hydrocarbon component in the gas mixture of coal fields are constantly changing, and their content increases significantly in tectonically disturbed zones of coal rock massifs. Qualitative and quantitative parameters of gas mixture indicators are controlled by the tectonic structure of coal rock massifs. While studying the mining and geological conditions in the coal mines of the Donets basin, it has been established that the main factors provoking sudden gas-dynamic phenomena include tectonic discontinuous faults (as well as small-amplitude faults or their zones), abnormally high bed pressures, stress state and gas content of the massif. The results of the conducted research will become the foundation for predicting mining and geological conditions favorable for gas-dynamic phenomena in coal workings, which will make it possible to develop a concept for preventing potential dynamic phenomena in mines.
Simulation modelling of residual resource for hoisting mechanisms in the mining industry
Authors: Kruzhnova Svitlana , Fursina Anna , Ilin Sergey , Adorska Larysa , Ilina Inna 
Published: June 2024

Abstract
The rationale for prolonging the operational life of the crane is rooted in the economic viability of conserving metal and energy, leading to ecological benefits. Cranes, being structures with a high metal content, contribute to pollution reduction by eliminating the necessity for additional manufacturing processes in mining, metallurgical, machinery plants, and energy supply facilities. To assess the remaining service life, statistical simulation modelling is employed. The objective is to showcase the feasibility of determining the residual resource within the time interval using the Monte Carlo method in simulation modelling. In this analysis, multiple random parameter values are generated, and calculations are performed to form a statistical distribution of the results. The reliability theory utilizes the Weibull distribution. Once the distribution parameters are established, the residual resource of the metal structure operating in the interval can be ascertained. A crane with a service life of more than twenty years is considered, and the quantity is modelled randomly within the range from zero to one. From twenty experiments, the results indicate an average resource with a confidence interval of few years.
Diffraction, spectroscopic and microscopic studies of the sand from the amber deposit
Authors: Kuzmanenko Halyna , Okholina Tetiana , Sofińska-Chmel Weronika , Maciołek Urszula , Drewniak Marek , Goliszek Marta , Wąż Barbara , Fursovych Ivan 
Published: June 2024

Abstract
QUARTZ sand plays a crucial role in the production of float glass, as it is the main source of silicon dioxide, which is necessary for the production of glass. The research was conducted on two samples of QUARTZ sand from the Oleksiivka amber deposit. The aim of this study was to investigate the morphology and chemical composition of QUARTZ sand samples. The identification methods such as infrared spectroscopy, X-ray diffraction, and electron microscopy with the Energy Dispersive X-ray Spectrometer detector were presented. Applied methods allowed to identify crystalline phases and non-crystalline components of the tested samples.
Prospects for using screens with double vibration-impact excitation for size separation and dewatering of wet mineral raw materials that are difficult to classify
Authors: Lapshyn Yevhen , Shevchenko Oleksandr 
Published: June 2024

Abstract
One of the most labor-intensive and energy-consuming processes is the process of particle size separation and removal of moisture from products of wide particle size classes with a high content of small classes less than 0.2 mm in size. Such raw materials are dehydrated by traditional methods to 18-22% and are practically not classified. A review of methods for intensifying these processes showed the promise of vibration impact, which can be applied to both the sieving surface and the processed raw materials. The designs of screens with double vibration-impact excitation for particle size separation and dewatering of wet mineral raw materials are considered. The influence of operating parameters and screening time on the technological performance of these processes was experimentally studied. It was established that the use of a disintegrator simultaneously with an activator and disintegrating elements made it possible, without the use of additional power, to reduce the moisture content of the over-grid product to 4-5% while extracting the -0.1+0 mm class into the under-grid product to 83-85%. The results obtained confirmed the prospects of using screens with double vibration-impact excitation for size separation and dehydration of wet mineral raw materials that are difficult to classify.
Fundamental principles and results of deep well lining
Authors: Stavychnyi Yevhen , Koroviaka Yevhenii , Ihnatov Andrii , Matyash Oleksandr , Rastsvietaiev Valerii 
Published: June 2024

Abstract
The review of the theory and practice of the special technological fluids application is analyzed. On the example of a specific borehole, with an actual vertical depth of 3287 m, intended for opening horizons B-17v, B-17n and project B-21, measures to clarify the filtration and capacity properties of reservoir rocks, increase production volumes are considered of hydrocarbons and accelerating the rate of selection of mining reserves. Testing in the interval 3364 - 3337.6 m of the B-21 horizon by using a set of test tools KVI-95, objectively proved that the specified object is characterized as penetrating, gas-saturated, the activity of which is reduced by contamination of the near-outbreak zone of the seam. As a method of determining clogging, a cut of the working end of the core with a length of 1 mm was applied. According to the results of the interpretation of the materials of the geophysical research of the specified borehole, it was established that the seam fluid comes from the interval 3339 - 3344 m. The paper determined that a promising way to solve the issue of high-quality cementing is the application of composite tamponage systems in combination with advanced preparation methods of borehole shaft.
The scientific landmarks for the development and evaluation of the effectiveness of vibration and noise absorbing materials
Authors: Belikov Anatoly , Tairova Tamara , Bykovskyi Anatoly 
Published: June 2024

Abstract
The mastic compositions with vibration and noise absorbing properties have been developed to reduce the level of noise and vibration in the low- and high-frequency range of the spectrum. Evaluation of the effectiveness of the developed vibration and noise absorbing mastic compositions “Vibroshtil” and “Vibroshtilmaxi” was carried out on an experimental installation by the method of free damping of plate vibrations with the determination of the decrement of vibrations. Mastic compositions are characterized by a high value of the sound absorption coefficient and the coefficient of mechanical losses in the range of operating speeds. The introduction of developed vibration and noise absorbing materials with an extended spectrum of action at the workplaces of workers will reduce the level of vibration and noise in the low- and high-frequency range of the spectrum by 7–15 dB and create safe working conditions. The main characteristic of the vibration and noise absorbing composite is the sound absorption coefficient, the value of which is in the range from 0 to 1. The main advantage of these compositions over the existing ones is the ease of manufacture, the ability to apply them to any surface by spraying or puttying.
Analytical modelling and design of linear controlled dynamic systems
Authors: Kravets Viktor , Kolosov Dmytro , Kravets Volodymyr , Dolgov Olexandr , Onyshchenko Serhii 
Published: June 2024

Abstract
A generalized canonical mathematical model of multidimensional controlled mining transportation complexes and other technical systems in form by A.M. Letov is considered. A principle of symmetry and an algebraic concept are in the basis of the developed analytical methods of design. A principle of symmetry is realized on a set of indexes of roots of a characteristic equation of the system and on a set of indexes of phase coordinates of the mathematical model. The problem of quality of dynamic processes in time is reduced to an algebraic problem of distribution of roots of a corresponding characteristic equation in a complex plane. An analogy in a procedure of transformation of a characteristic determinant into a polynomial and a structure of elementary symmetrical polynomials of roots is established. A new formulation of an analytical representation of change of phase coordinates in time in a form of ordered determinants with respect to indexes of roots and indexes of phase coordinates is obtained based on residue theorem. An illustration of the developed analytical method of design is performed on a special case of a well-known controlled technical system of the fourth order.
Prediction of fuel consumption and carbon dioxide emission when replacing gaseous fuels with renewable hydrogen or their mixture
Authors: Gupalo Olena , Yeromin Oleksandr , Kabakova Liudmyla , Kolienko Anatoliy , Kirsanov Mykhailo , Kulikov Andrii 
Published: June 2024

Abstract
The paper is devoted to predicting changes in fuel consumption and carbon dioxide emissions when industrial equipment is converted to heating with renewable hydrogen or a mixture of it with other gaseous fuels, such as natural gas. The authors developed a simplified methodology that is appropriate for assessing changes in the energy consumption of equipment and the environmental impact of fuel replacement at the stage preceding the equipment reconstruction. The peculiarity of the methodology is that it allows the calculation of fuel consumption and carbon dioxide emissions when fuel replacement is accompanied by the implementation of measures aimed at improving the energy efficiency of equipment. The methodology can be used for heating and thermal furnaces in metallurgy and mechanical engineering, units for heat treatment of raw materials in the mining and processing industries, heating devices in the food industry, and water and steam boilers. In the example of replacing natural gas with its mixture with renewable hydrogen of different compositions, it is shown that the calculation error using the proposed methodology in comparison with the results obtained by mathematical modeling of fuel combustion, gas flow and heat transfer in this furnace does not exceed 1.5%.
Numerical modeling of the thermal characteristics of a fan spray cooling tower
Authors: Zhevzhyk Oleksandr , Potapchuk Iryna , Pertsevyi Vitalii , Bosyi Dmytro , Biriukov Dmytro , Shevchenko Serhii 
Published: June 2024

Abstract
The work constructs a mathematical model of the heat and mass transfer process in a spray cooling tower. The mathematical model consists of the equations of motion and heat and mass transfer of water droplets and the equations of thermal and material balance of moist air, considers the polydispersity of the droplet flow and allows to calculate the cooling capacity of the cooling tower depending on the parameters of the droplet flow. The mathematical model is confirmed by the results of industrial tests of irrigation-free cooling towers. The simulation results show that the cooling capacity of a spray fan cooling tower significantly depends on the atomization dispersion and the height of the water cutting nozzles. Reducing the average diameter of the droplet flow to less than 2 mm and increasing the height of the nozzles H > 4…5 m make it possible to achieve the cooling performance of known cooling towers with nozzle. The mathematical model allows to calculate the cooling capacity of the cooling tower and determine the necessary individual parameters of the droplet flow for each type of equipment and consumers for which the specific energy costs for cooling is minimal.
Effects of primary aberration on the spatiotemporal optical vortex focus
Authors: Liu Yong , Kuang Cuifang 
Published: June 2024

Abstract
A spatiotemporal optical vortex (STOV) with transverse orbital angular momentum has several potential applications. However, refractive index mismatch, beam tilt and optical path misalignment are often inevitable during the application of an optical system. To investigate the focusing field of light pulse, the effects of primary aberrations such as the spherical aberration, coma, and astigmatism were analyzed. The simulation results indicate that three-dimension spatiotemporal distributions of the focusing light pulse are affected by primary aberration. On the principal coordinate planes, coma can distort the intensity structure and shift the STOV focus perpendicular to the propagation direction, while spherical aberration and astigmatism induce the actual STOV focus to shift along the propagation direction. Astigmatism do not affect the intensity structure of spatiotemporal plane without spiral phase, but stretch the 3D STOV focus along one spatial axis. Coma and astigmatism are necessary to be avoided to obtain a perfect STOV focus. It is helpful to improve the applications of STOV focus, such as optical tweezers, microscopy, and communications.
Perceived need for climate information
Authors: Tamang Tenzin 
Published: June 2024

Abstract
Understanding that human activities primarily cause climate change is fundamental to driving behavioral change. However, a significant gap exists regarding its anthropogenic nature, with public understanding often lagging behind the scientific consensus. This underscores that previous efforts to bridge this gap have not been effective, highlighting that the reception of information is a complex process influenced by individual perspectives, biases, and preconceptions. Therefore, an individual’s information behavior is crucial in the interrelationship between climate science and the public. This study investigated the factors explaining individuals’ perceived need for information to form a firm opinion about climate change. It explored the roles of information gap, climate anxiety, and environmental adversity in shaping these needs. The study’s analysis is based on the 2021 Climate Change Opinion Survey (N = 76,328) from Meta’s Data for Good Program. The survey was conducted on Facebook, inviting active users aged 18 and above to participate through their news feeds. It was administered across 31 countries. For the analysis, multinomial logistic regression was employed. The results showed that a high climate information gap and anxiety are positively associated with information needs. Environmental adversity is also positively correlated with climate information needs, but one’s awareness of climate change moderated the association.
Behavior of polypyrrole-coated cotton fabric undergoing biodegradation in compost-enriched soil
Authors: Piccioni Marta , Varesano Alessio , Tummino Maria Laura 
Published: June 2024

Abstract
This study investigated the biodegradation behavior of cotton fabrics treated with polypyrrole, a polymer with conductive and antibacterial properties. Fabric samples were buried in compost-enriched soil for 10, 30 and 90 days. The biodegradation level was initially estimated by a visual inspection of the fibers and by the determination of the fabric weight loss. Other physical–chemical changes of fibers during the biodegradation process were analyzed by microscopy, thermal analyses and infrared spectroscopy. The surface resistivity of the fabrics was also measured. The results obtained comparing the bare cotton samples and the polypyrrole-added ones suggested that, on the one hand, polypyrrole hindered/delayed the biodegradation of cotton in compost-enriched soil, probably exercising its inherent antimicrobial feature during the first period of burial. On the other hand, over time, polypyrrole seemed to represent the first compound attacked by the microorganisms, preserving the cotton substrate. Despite the absence of dedicated literature regarding polypyrrole biodegradation, the mechanism hypothesized in this paper involves the loss of conjugation, as a consequence of de-doping, oxidized functionalities up to local cycle breaking.
Spatial spillover effects of the digital economy on the green total factor productivity of China’s manufacturing industry
Authors: Huang Yipeng , Chen Zhiguo , Yin Shi 
Published: June 2024

Abstract
The rapid expansion of the digital economy has garnered significant attention because of its potential to drive high-quality advancement in traditional sectors, particularly manufacturing. This study examines the spatial dynamics and potential spatial disparities between the digital economy and green total factor productivity (GTFP) in China’s manufacturing sector. We utilize a novel set of indicators to assess the advancement of the digital economy during Chinese provinces and apply spatial econometric models to investigate its spatial influence on GTFP. The main research content and conclusions of this study are as follows. (1) By employing a novel index system to quantify the digital economy’s advancement level within the manufacturing sector across various provinces in China, and utilizing it as the primary explanatory variable, the index system demonstrates significant efficacy in empirical analysis and is both scientifically robust and methodologically sound. (2) Using the spatial Dubin model, this study analyzes the spatial effects of the digital economy on the GTFP of the manufacturing sector and finds that it has a dominant positive spatial spillover effect on the GTFP of the manufacturing industry nationwide. (3) The results show that the effects of digital economy advancement on GTFP in the manufacturing industry have a positive spatial spillover effect in the eastern and central area, whereas it is negative in the western area. This study extends the applicability of the new economic geography and imperfect competition theories to the digital economy era, thereby contributing to these academic fields. Moreover, it introduces a novel analytical framework for assessing the digital economy’s influence on manufacturing advancement. The findings provide valuable insights and policy recommendations for fostering the development of the digital economy advancement across diverse regions in China.