bluuebunny/crossref_metadata_2025 huggingface dataset:
Supply Chain Model of MSMEs Products in Modern Wholesale Surabaya
Authors: Siswati Endang , Pudjowati Juliani
Published: December 2024

This research aims to investigate the supply chain model employed by Micro, Small, and Medium Enterprises (MSMEs) in the retail sector, specifically focusing on the challenges they encounter as suppliers to wholesalers in Surabaya. Through interviews with employees of the Surabaya wholesale centre and MSME actors, this study elucidates the supply chain process, which commences with raw material suppliers and progresses through MSMEs, distribution channels, wholesalers, retailers, and ultimately reaches consumers. A key challenge identified in this research is the difficulty faced by MSMEs in competing with products from large-scale industries within the wholesale centre. Despite these challenges, several MSME products, such as Cakzin sweet and spicy shrimp potato chips and various bread varieties from Sri Roti, have successfully gained a foothold in the Indogrosir Surabaya wholesale centre.
The Influence of Asset Management on Optimizing the Utilization of Fixed Assets in Batu Bara Government
Authors: Sukma Kirana Rahmalia , Siahaan Elisabet , Talarosha Basaria
Published: December 2024

Governance in Indonesia has experienced significant changes since the post-Reformation era of 1988, particularly with the implementation of Law Number 22 of 1999 on Regional Government, which initiated the decentralization of authority from the central to regional governments. This implementation was further reinforced by Law Number 32 of 2004, which emphasized the obligation of regional governments to manage their own affairs based on the principle of autonomy. This study examines the influence of asset management on the optimization of fixed assets in the Government of Batu Bara Regency. The population in this study consisted of 99 employees distributed across 35 work units, resulting in a sample of 79 respondents representing the population. The analysis method used was Partial Least Square (PLS), with questionnaires distributed to 79 respondents. The results showed that asset inventory did not have a significant influence on the optimization of fixed assets, whereas asset legal audit and asset valuation had a positive and significant influence. Asset supervision and control were found to moderate the influence of asset inventory on the optimization of fixed assets, but did not significantly moderate the influence of asset legal audit and asset valuation.
The Phenomenon of Learning Social and Moral Skills on the Aggressive Behavior of Elementary School Students
Authors: Firmansyah Farid , Suroso Suroso , Farid Muhammad
Published: December 2024

It is suspected that there has been aggression in the school environment, including at the elementary school level. Concrete efforts are needed to reduce aggression behavior in schools carried out by fellow students, because the impact of aggression behavior inflicts prolonged psychological trauma on victims of aggression. This type of research is quantitative research with a post-test only experiment design. The aggressiveness scale is used to measure aggression behavior that has met the item discrimination and reliability indexes. The research data were analyzed with the Mann-Whitney non-parametric test, resulting in significant differences in aggression behavior of group students who acquired character learning, social skills, and morals with control group students. The aggression behavior that acquired character learning, social and moral skills was lower than the aggression behavior of the control group students. These findings suggest that character learning, social and moral skills have an effect on students' aggression behavior.
The Role of Banking Digitalization in Improving Financial Performance
Authors: Harmelani Indah , Cahyaningtyas Susi Retna
Published: December 2024

This research aims to fills the gap in the existing literature and provides valuable information for banking practitioners and policy makers in understanding how digitalization affects the financial performance of banks in Indonesia. This study uses a comparative research method (difference test) with a quantitative approach. The data used are secondary data obtained from the banking Annual Reports of the last three years when the bank was still operating as a conventional bank, namely 2018 - 2020 with the last three years after the bank transformed into a fully digital bank, namely 2021 - 2023. The results of the study show that ROA, ROE, BOPO do not show significant differences after digitalization. However, NPL shows a significant difference after undergoing digitalization.
Implementation of Product-Based Learning on Welding and Plate Practices II Course Oriented to Infrastructure Needs of the Department of Mechanical Engineering Education UNM
Authors: Nur Hamzah , Aqsha Ismail , Romadin Achmad , Ashadi Ninik Rahayu
Published: December 2024

Product-Based Learning (PBL) enables students not only to learn theory, but also to be directly involved in the production process of real goods or projects, so that the practicum skills needed in the industry can be formed more optimally. This research method used is mixmethode. The results showed that the implementation of PBL in the Welding and Plate Practice II course has great potential to develop student skills that are relevant to industry needs and support the department's infrastructure. The results of PBL implementation also reached a score of 4,304 with a percentage of 48.3% in the “Excellent” category, proving the effectiveness of this method in successfully supporting students' technical skills. Nevertheless, some obstacles such as limited laboratory facilities and lack of cross-disciplinary collaboration and industry involvement are still a challenge
Restoring @bajuyuli Business Image on Instagram Social Media in Facing the Threat of Cyber Crime Phishing
Authors: Zianisya Salwa Rahma , Rosyidudin Eki , Khotimah Ima Khusnul , Nurfalah Farida , Wihayati Welly
Published: December 2024

This research has a background regarding phishing and business image. This study aims to find out the recovery of business image by the @bajuyuli team and to find out the efforts to prevent cyber crime phishing by the @bajuyuli team. This research uses qualitative data analysis methods and techniques. The technique for determining informants in this study uses the purposive sampling technique. The purposive sampling technique is a method of selecting samples based on the desired goal by the researcher. With this technique, the researcher used three informants consisting of, @bajuyuli business owners, Instagram @bajuyuli admins, and customer @bajuyuli. The results of the research emphasized the importance of transparency, data security, and the role of Public Relations in overcoming crises and strengthening business reputations in the digital world. Efforts to combat such attacks require quick and effective recovery measures, as well as increased cybersecurity awareness among business owners and teams. This research provides insight into the importance of protecting business image from cyber attacks.
Diversity Management Strategies in Multicultural Organizations: Challenges and Opportunities
Authors: Silalahi Verry Albert Jekson Mardame , Rumambi Freddy Johanis
Published: December 2024

This research explores diversity management strategies in multicultural organizations, addressing challenges and opportunities arising from cultural, ethnic, gender, and demographic differences. With globalization, workplaces are becoming increasingly diverse, offering benefits but also challenges. This study employs a descriptive qualitative approach through a literature review to analyze diversity management strategies in global organizations. The findings highlight major challenges such as intercultural conflict, implicit bias, and cross-cultural communication barriers. Effective strategies include diversity training, anti-discrimination policies, and fostering an inclusive work environment. Properly managed diversity enhances creativity, innovation, and decision-making while broadening an organization’s global market reach. Practically, organizations are advised to develop inclusiveness policies and provide diversity training to promote workplace harmony. Theoretically, this study enriches diversity management literature by presenting a new approach to addressing workplace diversity. Future research should focus on empirical studies to deepen understanding of strategy implementation across various organizational contexts.
Boosting Reading Comprehension Performance: The Impact of Metacognitive Reading Strategies on Grade 11 Students
Authors: Jugas Ralph Jade M.
Published: December 2024

This study investigates the impact of metacognitive reading strategies on enhancing the reading comprehension of Grade 11 HUMSS students in the Reading and Writing Skills subject at i-Link College of Science and Technology in SY 2023-2024. Using an explanatory sequential research design over four weeks, strategies such as SQ3R, inferring and predicting, visualizing, and summarizing were applied. Pretest and posttest scores were analyzed, revealing significant improvement (p=0.00) with a large effect size (d=0.82). Focus Group Discussion highlighted seven themes, including confidence, engagement, and self-efficacy. A joint display confirmed alignment between quantitative and qualitative findings, indicating that metacognitive strategies effectively boost reading comprehension and academic performance, offering a promising approach for pedagogical enhancement.
Selectivity of the Traps and Push Net Fishing Gear in the Glass Eels (Anguilla spp.) Capture Fishery in the Cikaso River Waters, Sukabumi, Indonesia
Authors: Baihaqi Faqih , Annida Shafira Bilqis
Published: December 2024

Selectivity is a standard of the level of friendliness of a fishing gear that is reviewed based on the diversity of catches obtained. Nowadays, fishing gear construction and techniques are developed to obtain selective fishing methods. This study compared the selectivity of traps and push nets in glass eel fishing in the Cikaso River, Indonesia. The study was conducted from December 2020 to April 2021. The catch diversity index and relative abundance were used to analyze the selectivity of catch diversity in both fishing gears. Comparative analysis shows that push nets have slightly better selectivity than traps. However, the study's overall results showed a fairly good selectivity of both fishing gears in catching glass eels (Anguilla spp.) as their main catch target.
Empowerment of Jamu Gendong Entrepreneurial Community in Pangkalpinang
Authors: Sudirman Muhamad Seto , Purba Eva Dewi R , R Afif Fajri
Published: December 2024

Traditional jamu carrying is made using simple traditional processes, such as washing with clean water, peeling, grating, stamping, boiling, filtering, and other processes. The activity was carried out in two stages. In February 2023, coordination, permitting, and surveys were carried out. The implementation and evaluation of community service is carried out in the second week of April to Sunday. Entrepreneurs in Pangkalanbaru District gained a better understanding of NIB, Brand Rights, and the legality of making NIB, the benefits they obtained when registering their business after the NIB business actors obtained legality for their business.
FEATURES OF STUDYING THE MATERIAL COMPOSITION OF POLYMETALLIC ORE FOR ITS COMPLEX USE
Authors: Tyushkova Natalia , Losina Tatiana
Published: December 2024

The paper presents research on the development of enrichment of polymetallic ores of the Elan deposit. The heterogeneity of textures, structures and material composition of the ores of the Elan deposit make it a difficult object for technological research. The research was focused on the development of waste-free enrichment technology; progressive stadial, collective and collectively selective flotation schemes with full water circulation, ensuring environmental protection, using both currently manufactured by industry and promising (methyl isobutyl carbinol) reagents. The work was carried out using a number of modern accurate and precision physico-chemical research methods and well-known enrichment methods. Mathematical methods are widely used. Based on the identified features, a technology for the enrichment of all types of Elan deposit�s ores has been developed and confirmed in experimental industrial conditions, providing the production of copper, lead, zinc, pyrite and fluorite concentrates with high extraction of the components of the same name and the integrated use of ore. The technological typification of ores was carried out and a method for classifying ore samples by technological properties for technological mapping of the deposit was developed. One of the methods of increasing the reliability of engineering and geological assessment of ore deposits in the subsurface is technological mapping of deposits. Reliability improvement is achieved mainly through a detailed study of all natural types and phases of ores extracted at the deposit; differentiated calculation of ore reserves by technological types; correction of recoverable value in the technical and economic assessment of proven reserves, taking into account different ore enrichment. The practical value of the work, expressed in the development of technology for the approval of stocks. The scientific value expressed in the development of a methodology for classifying ores based on multidimensional statistical analysis.
ANALYSIS OF LABORATORY METHODS USED FOR THE DETERMINATION OF THE MINIMUM IGNITION ENERGY IN THE CASE OF AIR/FUEL DUST MIXTURES
Authors: POPA Catalin Miha , GHICIOI Emilian , PAUN Florin Adrian , GABOR Dan Sorin
Published: December 2024

The continued development of human society, from the technical and economic point of view, has led to the need for the increasingly widespread use in the various existing industrial branches of chemical substances and compounds in the form of combustible dust and dust. The processing, handling and storage of these pulverized substances often leads to the emergence of complex explosive mixtures whose explosiveness characteristics cannot be assimilated with the data available in the literature.
In places where the probability of the occurrence of potentially explosive atmospheres generated by the mixture of combustible dust with air is high, it is necessary to ensure an acceptable level of protection, in accordance with the rules in force, materialized mainly by the use of protected technical equipment in the respective areas suitable.

The safety requirements of technical equipment that can be used in areas with combustible dust are established after knowing the type of combustible dust and its sensitivity to ignition, defined mainly by determining the minimum ignition energy of the combustible dust.
The paper presents two methods for determining the minimum ignition energy, with a description of the equipment used and the principles of operation. Also, the results obtained from laboratory tests to determine the minimum ignition energy in the case of a combustible powder (nystatin) are presented, using the two methods.
ASSESSMENT AND PROSPECTS FOR DEVELOPMENT OF COAL RESOURCE POTENTIAL OF THE NORTH-EAST ARCTIC ZONE OF THE REPUBLIC OF SAKHA (YAKUTIA)
Authors: Khoiutanov Evgenii , Batugina Natalia , Fedorov Vladislav , Andreev Yurii
Published: December 2024

The article analyzes the mineral and raw material base of coal deposits of the Arctic zone of the Republic of Sakha (Yakutia), all of them were explored in the Soviet time in the middle of 40-50 years. The paper presents a comparative characteristic of the geographic and economic, mining and geological and geotechnological conditions of coal deposits in the basins of north rivers Jana and Indigirka. The qualitative characteristics of the coals have been studied, which showed that from the point of view of consumers from the local better are the coals of the Krasnorechenskoe and Tikhonskoe deposits, and the worst brown coals of Uyandinskoe and Kularskoe fields, which have a very high humidity and ash content. The article assesses the possibility of using coal for generation of electric and thermal energy during development of ore and placer gold deposits in the Arctic zone of the Republic of Sakha (Yakutia). The unit cost of electricity generation is lowest when using coal as fuel, which can be extracted from the Kular deposit. Taking into account the lower quality of the coal fields of Kular deposit, it is possible for the subsoil user to consider the issue of extraction and delivery of better-quality coal from the previously developed Soginskoe deposit. The results give the opportunity of a fuller assessment of the potential, role and place of coal, especially local coal, for the generation of electrical and thermal energy for use by mining and processing companies, focused on the implementation of ore and placer deposits development projects in Arctic zone.
EVALUATION OF THE WEAR OF THE CARRYING ROLLERS OF BELT CONVEYORS
Authors: Ambrisko Lubomir , Kubala Dusan , Cabanikova Lucia , Ondov Marek
Published: December 2024

The basic structural and functional element of a belt conveyor is the conveyor belt, which is supported by carrying rollers. Research in this area is important for increasing the service life of mining belt conveyor components. The rollers are subject to various forms of wear. Tribological interactions between the roller, the conveyor belt, and the particles of the transported material or impurities from the environment that enter the tribological system cause various forms of mechanical wear. Abrasion is the predominant type of wear for a given friction node. Abrasive wear causes tearing and cutting of the surface of the rollers. Moreover, they are also subject to chemical wear, namely corrosion of the damaged steel shells of the rollers. The combination of the individual types of wear led to damage that affected the thickness of the roller shell and its basic mechanical property, namely Vickers hardness. In this paper, non-destructive testing methods were applied, while the hardness was determined by the UCI (Ultrasonic Contact Impedance) method and the shell thickness was determined by the ultrasonic method.
JUST IN BLAST- VR TRAINING
Authors: Piestrzynska Julia
Published: December 2024

"Just in blast - VR training" is a student project, the main idea of which was to create a VR (Virtual Reality) training in blasting technology. The footage was recorded on the site of the Holcim Dolomite Mine "Radkowice" in cooperation with SSE Poland in the summer of 2023, with 360-degree wide-angle cameras. The acquired material was then properly selected and edited for further activities, which ultimately led to the editing and creation of an application in VR extension. The whole project is aimed at popularizing issues in the fields of mining and geological sciences to a wider audience, in particular the field of Open Pit Mining. During the session presentation of the created application-training in 360 technology which tests the user's knowledge of blasting technology. It consists of elements covering the process of designing blasting works, the process of preparation, carrying out blasting works and detonation. In addition, the training also includes the stage of preparing blasting holes with drilling works. The paper will include an introduction and explanation of VR 360 technology and its impact on the effective and rapid absorption of information by the user. The process of recording the training with a 360 camera will be presented, followed by the process of assembling the application and a demonstration of the final product on a tablet.
MULTICRITERIA ANALYSIS OF THE AGGREGATE PRODUCTION BY-PRODUCT PURPOSES
Authors: Ondov Marek , Sofranko Marian , Chovan Jan , Szucs Marek , Hlavaty Lukas
Published: December 2024

Aggregate is one of the essential components of artificial structures. Aggregate is obtained by mining, as is the case with mineral raw materials. The output of aggregate mining is, in addition to the main product, also a secondary one - sludge. Sludge is an integral part of the wet processing of the most minor aggregate fractions. The amount of sludge in quarries is increasing, while the task of sludge management is to find a purpose for it and thus utilize it. Sludge management methods must consider the most negligible possible burden on the environment and the use of mining areas. Sludge pressings may be a way to reuse waste material. The properties of sludge pressings indicate the possibilities of their inclusion in the processes of various branches of industry. The multicriteria analysis also focuses on the economic side of their potential purposes because their price as a commodity created from waste is low on the market. The goal is to find a variant that will benefit the potential customer but, at the same time, will not worsen the economic situation of the quarry that will supply the sludge pressings. Among the analysis criteria, logistic criteria must be included, considering the costs of the preparation, storage, handling, and transportation of sludge pressings.
NOISE EVALUATION FOR THE DUMPER DRIVERS IN MINING ACTIVITIES: A CASE STUDY
Authors: Guido Alfaro Degan , Andrea Antonucci , Gianluca Coltrinari , Sara Innocenzi , Dario Lippiello
Published: December 2024

Mining activities are carried out employing a variety of machineries and equipment; in many cases these can generate relevant health problems for workers. One of the biggest hazards for workers is noise, since prolonged exposure to a noise source could cause damage through long-term exposure. Various researchers pointed out that the damage that can be generated by exposure to noise is of various types with sometimes very serious consequences. Specially drivers of particular vehicles of the mining sector, such as dumper truck and excavator, are exposed to the risk of whole-body vibrations and at the same time noise generated by the engine truck. This problem is especially founded for Load-Haul-Dump (LHD) vehicles where the driver's seat is positioned near to the engine. The objective of this study is to assess how different work phases can affect the noise exposure of LHD drivers. A measurement campaign was carried out at a site if mining 100 km from Rome a mountain context. The measurements were carried out on dump truck drivers with the aim of assessing noise exposure. The measurements were carried out with a device to detect the sound signal. The measurements were repeated several times to be able to characterize the actual working cycle during all driving phases of the LHD vehicle. The signal after being acquired was processed with a specific instrument in order to determine the sound levels and frequency spectrum and the signal analysis was carried out in third-band octave frequencies. The results obtained in the measurement campaign carried out showed a significant influence of the different phases of vehicle use on the driver's noise exposure.
RESEARCH ON THE BEHAVIOR OF METAL CONSTRUCTIONS UNDER THE ACTION OF EXPLOSIONS
Authors: Ilici Stefan , Laszlo Robert , Dinu Florea , Gheorghiosu Edward , Simon Bogdan
Published: December 2024

The explosions produced in industrial/chemical facilities, such as hazardous material storage facilities, are events with low probability but high destructive potential. When occurring in a densely populated area, such explosions can lead to extensive damage of nearby buildings or infrastructures, resulting in high economic costs and human injuries and fatalities. The explosions may be the result of an accident but may also be intentional. As the pressure released by the external explosions decreases exponentially with the distance to the target, increasing the stand-off distance is one of the most effective ways to mitigate the effects against structures. In addition, the local resistance of the facade elements must be increased to prevent or limit the spread of damage. Even though these issues are well known and understood, there are relatively few provisions in the current European practice. The destructive effect of the high velocity debris projected by the explosion should also require attention, as they can cause severe harm to people. The study presented in the paper investigates the capacity of light steel-based building facades to resist the effects of near field blasts. The experimental results showed the ultimate capacity of the wall panels is strongly dependent on the initial design conditions and panel-to-structure fastening solution.
FLOTATION AND MAGNETIC SEPARATION PROCESSES FOR A MINERAL OF WOLLASTONITE
Authors: Marco Surracco , Caterina Tilocca Maria
Published: December 2024

This paper presents the results of laboratory processing tests conducted to explore the potential for beneficiation of a wollastonite mineral (calcium metasilicate, CaSiO3). The ore studied comes from a mineralized body located in the southern part of Sardinia (Italy), which has been studied in the past with geological surveys and sampling. In the investigated area the mineralization was very irregular. The encasing rocks consist of schist and the mineralized body is composed of wollastonite associated with limestone, garnets and silica. The sample used for treatment tests was taken from this area and underwent various tests, including grinding, froth flotation, and magnetic separation. Finally, we conducted an overall treatment test using the beneficiation techniques that yielded the best results in the previous experiments. The treatment scheme followed in the overall test utilized simple techniques such as grinding, calcite flotation and magnetic separation. As a result, the concentrate contained 80% wollastonite and met the pollutant element specifications. The final grinding stage was necessary to meet the market's required particle size specifications. The flotation tests were conducted in a Denver laboratory cell, while a Jones wet high-intensity magnetic laboratory scale separator was used for the magnetic separation tests. The effectiveness of the various steps of testing was verified by comparing the results obtained with the specifications required by the wollastonite market, which impose minimum quantities of contaminants, such as iron, titanium and magnesium, while being less severe with regard to SiO2 and CaO contents.
RECOVERY OF LITHIUM AND DESALTED WATER FROM OILFIELD BRINE
Authors: Knapik Ewa , Rotko Grzegorz
Published: December 2024

Oilfield brine extracted with hydrocarbons is often considered as a problematic waste. The typical management option for this produced water is reinjection into the formation to maintain the reservoir pressure (or just for disposal). High salinity of produced water is on the one hand a drawback, but on the other hand an advantage because it can be used as a raw material for the production of valuable chemicals. In this paper a freezing-thawing desalination method was tested to obtain partially desalted water and concentrated brine from produced water. The obtained desalted water with conductivity lower than 10 mS/cm could be beneficially reuse for non-potable applications (crop irrigation, livestock watering). The concentrate with conductivity above 80 mS/cm is a suitable feed for salt/chemicals production. As the lithium content in the obtained concentrate was high, up to 20 mg/L, so the Mn-based sorbent was applied to recover it. The lithium-selective sorbent was prepared via solid state reaction and its morphological and textural parameters confirm its good chemical stability and high affinity towards lithium ions. The lithium recovery ration in static conditions was above 95 %. The obtained results prove that produced water may be beneficially reuse outside the energy sector.
USE OF REGRESSION ANALYSIS AND SIMULATION TO OPTIMIZE THE COMPOSITION OF THE CAST IRON CHARGE
Authors: Futas Peter , Pribulova Alena , Petrik Jozef , Blasko Peter Peter , Mihalikova Maria
Published: December 2024

Cast iron GG30 (EN-GJL-300C) has excellent mechanical properties and good machinability. It can be used in many industries such as hydraulics, engineering, automotive, oil and gas mining, and processing. It is suitable for the production of compressor and pump components. Return material, technological residue, iron scrap, fractional cast iron, liquid metal, and alloying components can be used as input raw materials in the production of cast iron, the first three were taken into account in the analysis. In practice, it is possible to choose their different ratio. At the same time, their chemical composition is somewhat variable. The aim of the paper is to compare two models, LINEST and DoE, which, with the help of regression analysis, determine the influence of these input raw materials (factors) on the mechanical properties: ultimate strength Rm, hardness HB of the final cast iron. The equations obtained will enable the calculation of the appropriate ratio of these three input raw materials to ensure the required mechanical properties of the final product. The equations obtained using DoE correspond more closely to the measured values than the equations obtained by LINEST, their calculation is more complex and requires the use of software. Based on these equations, taking into account the variability of the input data (for example, the fluctuation of the chemical composition of the iron scrap used), it is possible to estimate the proportion of castings with the required mechanical properties. For example, with a charge containing 40 % of technological residue, 22 % of returnable material, and 38 % of iron scrap with a variability of � 10 %, it will meet the requirements of the standard for tensile strength Rm of 99.85 % of castings and hardness HB of 81.88 % of castings.
ASSESSMENT OF THE QUALITY FACTOR OF LITHOSPHERE FOR THE LENA DELTA (LAPTEV SEA REGION)
Authors: Krylov Artem A. , Kovachev Sergey A.
Published: December 2024

The parameters of strong ground motions necessary for seismic hazard assessing of construction sites have pronounced regional differences. In inaccessible and poorly studied areas, the development of a ground motion prediction equation (GMPE) requires determination of regional characteristics of the radiation and propagation of seismic waves, in particular, the quality factor of the lithosphere.
This work is devoted to determination of the quality factor and its frequency dependence for the Lena Delta, one of the key areas of the Laptev Sea region, the most seismically active of all Arctic marine regions of Russia. For this purpose, the coda normalization method was used in relation to signals from 5 microearthquakes with Ml > 2, recorded by a temporary local network of seismographs operating in the Lena Delta in 2016-2017.
Regional values of quality factor Q = 486�42 were obtained. The scatter of values is probably due to the anisotropy of the environment in the study area. The dependence of the quality factor on frequency is described by the found function Q(f) = 84.328f0.8128. The exponent in this relationship is comparable to the values typical for regions of Mexico, Australia and Canada.
RECEIVER FUNCTIONS APPLICATION FOR STUDYING THE DEEP STRUCTURE OF THE LENA DELTA REGION
Authors: Novikov Mikhail , Krylov Artem , Roginskiy Konstantin
Published: December 2024

Receiver function analysis is a critical tool in seismology, used to study the deep structure of the crust and upper mantle. Information about the deep structure of the crust and seismicity is important initial data for developing a source model and seismic hazard assessment.
The presence of sharp discontinuities beneath the monitoring station induces the generation of converted body waves, which propagate at slower velocities than those of the primary P-wave. Receiver function analysis utilizes the lag between the arrival times of converted waves to estimate the depths of interfaces. Furthermore, by using various inversion algorithms, including receiver function inversion and surface wave group velocity inversion, a shear wave velocity model under the station can be inferred.
This study seeks to examine the depth-velocity structure of the Lena Delta by analyzing receiver functions and surface-wave data. Receiver function analysis was performed using waveforms from the TIXI station, a component of the Yakutsk Regional Seismic Network of the Russian Federation. For the analysis, 245 large earthquakes (Ml > 7) occurring between 2000 and 2024, and located at distances ranging from 20� to 100� from the station, were initially selected. The iterative deconvolution was then used to obtain radial and transverse receiver functions. Three different inversion algorithms were used to attain the velocity model: receiver function inversion (rftn96), Rayleigh group wave velocity inversion (surf96), and joint inversion (joint96).
A wide peak lasting from 3 to 5 seconds after the initial P-wave arrival and a sharp peak at 7.5 seconds were observed on the radial receiver function. The presence of two distinct peaks complicates the application of conventional H-k stacking analysis, which assumes a single discontinuity. Rayleigh wave group velocity inversion only showed one sharp increase in shear wave velocity at 15 km, while both receiver function inversion and joint inversion showed step-like increases at 15, 30, and 40 km, which indicates the presence of layer boundaries at these depths. The obtained values are consistent with existing data on the region, including deep seismic sounding profiles and crustal models. Previous research, along with the findings of this study, indicates that 15 km is most likely the boundary between the upper and the lower crust, 30 km is a transition to the anomalous mantle, and 40 km is the Moho boundary.
ASSESSING THE IGNITION SOURCES GENERATED BY THE MECHANICAL EQUIPMENT IN THE CONTEXT OF HYDROGEN EXPLOSIVE ATMOSPHERES
Authors: Jurca Adrian Marius , Paun Florin Adrian , Popa Mihai Catalin , Radu Mirela
Published: December 2024

A potentially explosive atmosphere exists when a mixture of air, gases, vapours, mists or dust combines in a way that can ignite under certain operating conditions. Hydrogen is the special gas in this context. Those who have knowledge of the properties and flammability of hydrogen will recognize that hazards due to explosive atmospheres must be assessed more and more frequently as the element is utilized, and, if necessary, appropriate protective measures must be taken. In this kind of atmosphere, special attention should be given to the mechanical equipment that are being used for operational purposes, as they might initiate an explosion. Mechanical equipment used in explosive atmospheres should be assessed through an ignition hazard assessment. They must fulfil the essential health and safety requirements, which implies that they shall be assessed according to their ability to prevent them from becoming ignition sources and their ability to protect against the consequences of an explosion.
This paper presents the issue of the ignition hazard assessment of mechanical equipment and points out some aspects that may be important to consider when assessing mechanical systems for use in potentially explosive atmospheres. Ignition of explosive atmospheres by mechanical equipment occurs when energy supplied by equipment is converted into heat, usually as the result of a mechanical failure of the equipment or associated systems. The ignition hazard assessment procedure also involves a series of specific laboratory tests. These tests demonstrate the non-sparking character of the materials used in the manufacture of mechanical equipment and the fact that the assessed equipmen
DETERMINATION OF EXPLOSION PARAMETERS FOR AIR-GASOLINE MIXTURES
Authors: Nalboc Irina , Prodan Maria , Szollosi-Mota Andrei , Suvar Sonia
Published: December 2024

The explosive atmosphere may be caused by flammable gases, vapors, or combustible dust. In the event that the material is combined with air in an adequate proportion, an ignition source is required to produce an explosion. Fuels and other liquids, as well as solvents from industrial items, release volatile vapors that can catch fire or explode when they come into contact with the air. At normal temperatures, flammable liquids can emit enough vapor to form combustible mixtures with air, heat, and often thick, black, and toxic clouds of smoke. The potential causes of explosions within work systems are represented by the intrinsic properties of flammable/combustible chemical substances and preparations used, dangerous chemical reactions, energy sources, or the ability of technical equipment, work methods, or techniques to cause human or material damage. Understanding the characteristic explosive parameters in regulated settings is essential to evaluating the risk of explosion and the evolution of explosion in such mixtures.
In this paper maximum explosion pressure pmax and maximum rate of pressure rise (dp/dt)max for gasoline-air mixtures were determined in a standard 20 dm3 spherical explosion vessel in order to validate in the laboratory the method of determining the explosion parameters of air-vapor mixtures.
HYDROGEOCHEMICAL CHARACTERIZATION OF CARBONATE OIL DEPOSITS: INSIGHTS INTO IONIC COMPOSITION, FRACTURING AND CONNECTIVITY
Authors: Shipaeva Maria , Talipova Kamilya , Fakhriev Nil , Sudakov Vladislav
Published: December 2024

In this work, the ionic composition of formation water of three oil deposits (C2vr, C2b, C1pr) was studied. The study of these deposits holds both practical and scientific interest. Due to their complex geological structure, they are difficult to develop. Productive deposits are characterized by the presence of widespread unconsolidated zones with high vertical and horizontal fracturing, high layered heterogeneity, the absence of significant regional reservoir-seal rock, and difficulties in cross-well section correlation. The close position of the Oil-Water Contact (OWC) and the high degree of fracturing contribute to the rapid watering of production wells.
Reservoir brines are characterized by an unusual hydrogeological composition: this is a significantly lower mineralization (30 g/l) of C2b and C1pr deposits instead of 250 g/l in comparison with brines of the same age in neighboring areas. We found the different ratio of the main ions, a lower position of the upper boundary of the zone of distribution of calcium chloride-type brines, lower content microcomponents.
In the work, the ionic composition of about 200 brine samples of the deposits was studied. Mass concentrations of six macrocomponents: HCO3-, SO42-, Cl-, Ca2+, Mg2+, Na+K+�were determined, along with measurements of TDS, acidity, and density of formation waters. Based on the results of the analysis, the features of the hydrogeochemical properties within the carbonate deposits were established. Zones of hydrodynamic connectivity of the deposits with each other have been identified. New fractures were found. The results obtained are recommended to be used for identifying the water source in case of well interventions.
IDENTIFICATION OF INPUT-OUTPUT PARAMETERS OF THE COMMAND AND CONTROL SYSTEM FOR TESTING FLAMEPROOF PROTECTED ELECTRIC MOTORS USED IN HYDROGEN ATMOSPHERE
Authors: Rad Marcel Daniel , Magyari Mihai , Fotau Dragos , Zsido Attila Sorin , Sirbu Constantin Valentin
Published: December 2024

The certification requirements for electrical equipment used in potentially explosive environments are outlined in EU Directive 2014/34.
In order to certify electrical equipment used in potentially explosive environments, the EU has set requirements. Certification and compliance requirements are outlined in EU Directive 2014/34. All electrical equipment used in potentially explosive environments must abide by this guideline. Electrical equipment makers and their authorized representatives are subject to the directive. The regulation lays forth the safety standards that electrical equipment needs to fulfill in order to be approved for use in potentially explosive environments. According to the directive, there are three categories of potentially explosive atmospheres: Zone 0, Zone 1, and Zone 2. The rule also specifies how electrical equipment that has been approved for use in potentially explosive environments must be marked.
Testing to make sure the equipment satisfies safety regulations is a necessary step in the certification process for electrical equipment. Testing is carried out by accredited testing facilities. The appropriate national accrediting agencies have granted testing laboratories their accreditation. The testing labs adhere to the guidelines provided in the electrical equipment testing directive. Equipment for electrical, mechanical, and thermal safety is tested as part of the testing process. The equipment's capacity to stop potentially explosive environments from igniting is also being tested.
INVESTIGATION OF THE PROCESS OF INTRODUCING THE CENTRALIZER SLATS INTO THE WALLS OF THE TRUNK WHEN DRILLING INCLINED WELLS
Authors: Zholbassarova Akshyryn , Saduakassov Danabek , Togasheva Aliya , Tabylganov Maxat , Gusmanova Aigul
Published: December 2024

In this article, a theoretical and experimental study of the processes of embedding the centralizer bars on the walls of the well during drilling is carried out. For this purpose, a mathematical model has been created that describes the dynamics of the process, taking into account the axial load on the bit and the own weight of the drilling column. The formation of a compacted core in front of the centralizer, as well as the stress-strain state of the medium, is considered. The proposed approach allows us to take into account the possibility of introducing a centralizer on the walls of the well and adjust the curvature parameters of the trunk of inclined wells. The results of this study can be useful for optimizing the drilling process and improving the efficiency of wells. The study is aimed at analyzing the technical and economic aspects of the installation of inclined wells, based on the state of spatial curvature of the trunk. It was found that stabilization of the design azimuth of the curvature is a difficult task in deep inclined wells due to the lack of continuous information about the course of the curvature parameters. Technological problems such as measurement inaccuracy and selection of equipment parameters are described. Special attention is paid to the use of a magnetic translator and a downhole inclinometer to accurately orient the deflector at the bottom of the well, which is the most accurate and cost-effective method in modern drilling operations.
PREVENTING PIPE STICKING IN OIL AND GAS WELLS USING AN IMPROVED TORQUE AND DRAG MODEL, ALONG WITH ANALYTICAL AND MACHINE LEARNING METHODS
Authors: Sharaouva Aizada B. , Delikesheva Dinara N.
Published: December 2024

Effectively preventing pipe sticking in oil and gas wells is a key aspect of safety and productivity in the oil and gas industry. This paper presents a new torque and drag model developed using machine learning techniques to improve accuracy and predictive capabilities. The model is based on a comprehensive analysis of many factors, including geological characteristics of the well, drilling parameters, fluid parameters, hydraulic conditions, and production equipment parameters. This research explores the application of a chained regression model combining Multilayer Perceptron (MLP) and XGBoost for predicting multiple physical properties in the oil and gas industry. The study aims to enhance prediction accuracy in hydraulics, torque, and drag by leveraging the strengths of both models. The model will help improve the monitoring and interpretation of drilling data streams. Besides the model will help detect signs of other interfering problems in the downhole wellbore conditions and take the necessary measures in advance to prevent them. As a result, it will help optimize costs, minimize non-productive time, and improve safety.
A MULTIDISCIPLINARY APPROACH TO TELEGRAM DATA ANALYSIS
Authors: Varbanov Velizar , Kopanov Kalin , Atanasova Tatiana
Published: December 2024

This paper presents a multidisciplinary approach to analyzing data from Telegram for early warning information regarding cyber threats. With the proliferation of hacktivist groups utilizing Telegram to disseminate information regarding future cyberattacks or to boast about successful ones, the need for effective data analysis methods is paramount. The primary challenge lies in the vast number of channels and the overwhelming volume of data, necessitating advanced techniques for discerning pertinent risks amidst the noise. To address this challenge, we employ a combination of neural network architectures and traditional machine learning algorithms. These methods are utilized to classify and identify potential cyber threats within the Telegram data. Additionally, sentiment analysis and entity recognition techniques are incorporated to provide deeper insights into the nature and context of the communicated information.
The study evaluates the effectiveness of each method in detecting and categorizing cyber threats, comparing their performance and identifying areas for improvement. By leveraging these diverse analytical tools, we aim to enhance early warning systems for cyber threats, enabling more proactive responses to potential security breaches. This research contributes to the ongoing efforts to bolster cybersecurity measures in an increasingly interconnected digital landscape.
ORGANIZATION OF MIXED-CRITICAL COMPUTING SYSTEMS FOR CONTROL OF MULTI-OPERATIONAL TECHNOLOGICAL SYSTEMS
Authors: Pinkevich Vasiliy , Kluchev Arkady , Platunov Alexey , Kluchev Vladislav
Published: December 2024

Automation of complex technological and laboratory systems requires the creation of specialized mixed-critical computing systems. They must control the technological process at several levels (control subsystem) and maintain the user interface with technological data management (information subsystem). So, they execute tasks with significantly different criticality.
Also, it is assumed that the development of physical components, the implementation and configuration of the control subsystem at different stages of the life cycle is carried out by applied specialists (industrial engineers, servicemen, end-users), not professional computer and software engineers.

In this article we propose and justify the architecture of the automation platform and computing systems for such technological and laboratory systems.
For efficient control of customized technological process, it is necessary to partition it to several levels from primitive operations to batch execution of hundreds and thousands of tasks, each including thousands of primitive operations. The methods of partitioning are proposed with an emphasis on finding a balance between flexibility and difficulty of configuration.
The ways of further expanding of the platform are proposed through the introduction of alternative and more advanced algorithms for solving non-trivial technological process control issues, for example, dynamic process planning.
Solutions of instrumental issues related to the creation and support of specialized programming/configuration languages, compilers, and virtual machines throughout the entire life cycle of the platform are proposed.