bluuebunny/crossref_metadata_2025 huggingface dataset:
Social media as a source of knowledge used in financial market investments
Authors:   Uniwersytet Mikołaja Kopernika w Toruniu, Jankowski Jakub , Piotrowski Dariusz ,   Uniwersytet Mikołaja Kopernika w Toruniu
Published: May 2024

Social media are a source of an enormous amount of data that can support investment decisions, with the development of digital technology in the field of data processing making the analysis of the content published on sites such as Twitter, Facebook and YouTube an indispensable part of the investment process for many financial market participants. The aim of this study is to identify the applications of social media in financial market investing, as well as undertaking to determine the position of social media among the available sources for obtaining market information. The empirical data used in the analysis was obtained through a survey carried out using the CAWI method. The results of the survey indicate that social media are an important source of information, especially for respondents with experience in financial market investments, although they are inferior to financial portals in this respect. The varied use of the social media platforms analysed was also recognised. The main advantage of using Twitter was identified as the ability to monitor current trends and follow the profiles of investment experts, for Facebook it was the ability to join investment-themed groups, while YouTube was valued for its access to educational content.
Organisational commitment and knowledge sharing at different stages of education
Authors:   Uniwersytet Jagielloński w Krakowie, Wziątek-Staśko Anna , Michalik Izabela ,   Zespół Szkół Technicznych w Bytomiu
Published: May 2024

Organisational commitment and knowledge sharing enjoy unflagging interest in the modern world. Due to the benefits of a high level of organisational commitment and knowledge sharing, this issue is important for scientific and educational development. The aim of the publication is to determinate the relationship between organisational commitment and knowledge sharing in the teachers’ community, in the context of the educational stage at which they work. The basis for the functioning of education involves the commitment of teachers who, by creating, distributing and using their knowledge and ideas, are the foundation of their schools. The publication was based on the results of previous research, conducted in the form of literature studies and empirical research using quantitative methods in a group of 494 teachers working at various stages of education. The results of the empirical research showed the impact of the educational stage on the relationship between organisational commitment and knowledge sharing among the respondents surveyed. Statistically significant positive correlations between normative commitment and all indicators of knowledge sharing were found in the group of teachers working in secondary and postsecondary schools. A relationship was identified between organisational commitment in the following three components: affective, continuance and normative commitment, and teachers’ knowledge sharing based on a moderator in the form of an educational stage.
The isolation of people with disabilities in the context of legal, economic, social, and technological impacts of the COVID-19 pandemic
Authors:   Uniwersytet Gdański, Delińska Liwia , Siciński Jędrzej ,   Uniwersytet Gdański, Sliż Piotr ,   Uniwersytet Gdański, Antonowicz Paweł ,   Uniwersytet Gdański, Orłowska Sylwia ,   Fundacja Rozwijamy Skrzydła, Kajnath Mateusz ,   Stowarzyszenie Przedsiębiorczości i Rehabilitacji
Published: May 2024

The COVID-19 pandemic impacted the functioning of many social groups in Poland. Scientific publications addressing this issue in the field of social sciences focused primarily on the situation of organisations in the context of remote work and technological transformations associated with new challenges arising from isolation. The literature review conducted identified a knowledge gap, characterised by a limited number of publications addressing the effects of isolation on people with disabilities, particularly the shift in power dynamics in the broader environment that affects the lives of this social group. The research problem was formulated in the form of a question: What are the consequences of isolation for people with disabilities from the legal, economic, social, and technological dimensions of the pandemic? The study results revealed that the COVID-19 pandemic posed a challenge to the healthcare system regarding people with disabilities. The research methods included literature review, an opinion survey, tools, PEST analysis, and statistical analysis.
Graduates of non-traditional fields of study on the labour market five years after graduation
Authors:   Szkoła Główna Handlowa w Warszawie, Rocki Marek
Published: May 2024

The article presents the results of work on non-traditional fields of study (as a continuation of the research described in Rocki 2018b, 2018c, 2022a). The aim of the study was to verify the hypothesis about the validity of conclusions regarding selected fields of study initially formulated on the basis of data on the economic fate of graduates following their first year after graduation, but taking into account data obtained five years after graduation. Changes in the values of selected indicators determined in the nationwide system for monitoring the economic fate of graduates and information from the reports of the Polish Accreditation Committee (PKA) were compared in the study, with focus on fields classified as non-traditional (conducted in one or at most several universities). An additional goal of the work was to verify the hypothesis about the differences in the fate of graduates of non-traditional and traditional fields of study with the same name (similar learning outcomes) and the impact of migration on the economic fate of graduates. The results discussed in the author’s previous publications were confirmed: some of the analysed non-traditional fields of study are not valued by employers. However, it was also shown that in most of the analysed cases graduates of non-traditional fields of study are assessed better by employers than those of traditional fields of study. Graduates of a few selected non-traditional fields tend to take up work in voivodeships other than the voivodeship of their studies. Comparison of the conclusions resulting from the data from the system for monitoring the economic fate of graduates with the PKA reports developed in the procedure for assessing the quality of education leads to the conclusion that PKA reports are often more favourable for universities than the valuation of graduates on the labour market.
Diversity of employees’ preferences towards creative versus routine work, and individual versus teamwork in remote work conditions
Authors:   Uniwersytet Łódzki, Mizera-Pęczek Patrycja
Published: May 2024

The change in preferred work models that occurred during the pandemic and post-pandemic period has meant that both creative and reproductive work now takes place in stationary, hybrid, and fully remote conditions. Employees, both those performing creative and reproductive work, in teams or individually, increasingly have to function efficiently in virtual reality, and thus in conditions of physical loneliness. Therefore, this article aims to identify how performing work remotely contributed to changing the preferences of creative and non-creative employees towards performing professional duties of a creative versus routine nature, individually or in teams. The research was carried out using the CAWI survey method among 1,000 respondents in Poland, examining their opinions on the preferences for performing work of various types in remote conditions. The study showed that each of the four types of work examined is a challenge for employees who work remotely, with the majority of respondents declaring that each type of work (creative individual, creative team, routine individual, and routine team) is more difficult for them than in the pre-pandemic reality. Moreover, it was found that the more creative the nature of the work performed, the more negatively employees assessed the preferences for performing creative and routine work, both in teams and individually. Managing creative and reproductive work is one of the most important challenges for modern managers. Currently, many scientific discussions concern what work can be automated or entrusted to artificial intelligence, and what should remain in human hands. This article may be of interest to managers as well as psychologists and creativity educators, whose task will be to prepare work teams to perform creative tasks (work of a creative nature) in remote conditions. The original value of the presented work is such a broad approach to research issues, considering both preferences for creativity and reproduction of work in conditions of individual remote work and remote teamwork. The article takes into account aspects that are important from the perspective of human resources management, management of creative teams, and employee creativity management with the increasing use of hybrid and fully remote work models in organisations.
An Assessment of Information Literacy Skills Among Secondary School Students: A Case Study from Toruń
Authors:   Uniwersytet Mikołaja Kopernika w Toruniu, Skibińska Małgorzata
Published: May 2024

Information literacy lies at the heart of lifelong learning and is a prerequisite for effective participation in an information society. This article discusses the level of information literacy skills observed among Polish secondary school students, based on the example of two secondary schools in Toruń, with the information literacy of the study population identified and characterised using the SCONUL Seven Pillars of Information Literacy model, and also compared with the students’ self-assessment of their information skills and knowledge. The majority of students were classified as competent, having mastered information skills to a satisfactory degree in most of the pillars analysed, although competency areas in need of educational efforts were also identified.
Identifying the disadvantages of remote working as a source of loss of employee satisfaction – the perspective of Generation Z in Poland
Authors:   Uniwersytet Ekonomiczny w Krakowie, Wójcik Marzena , Łukasiński Wiesław ,   Uniwersytet Ekonomiczny w Krakowie
Published: May 2024

After reviewing the literature on the topic, a lack of studies of the opinions of Generation Z on the perceived disadvantages of remote work was identified, forming a research gap. It was considered important to determine how employees representing Generation Z in Poland perceive their impact on job satisfaction, which is important in the process of building motivational systems. The purpose of the article is to determine the perception of representatives of Generation Z in Poland of the impact of the disadvantages of remote work on job satisfaction. The goal is to find answers to the question - which disadvantages significantly reduce the level of their satisfaction? Realisation of the chosen objective, answering the research question and verifying the hypotheses were possible by conducting a literature review and a survey, and using selected instruments of statistical analysis. The study showed that male and female representatives of Generation Z statistically have significantly different perceptions of the disadvantages of remote work, which can affect the lack of satisfaction with remote work, with its disadvantages classified into 4 areas. The survey found that the greatest impact on lack of satisfaction with remote work was from increased stress, awareness of the lack of physical interaction, isolation, inadequate technical infrastructure, as well as the need to perform tasks independently and an increase in responsibilities without additional compensation.
Integration of payment systems in the metaverse – challenges and the future of e-commerce in the virtual
Authors:   Politechnika Rzeszowska, Kuraś Paweł , Organiściak Patryk ,   Politechnika Rzeszowska, Kowal Bartosz ,   Politechnika Rzeszowska, Strzałka Dominik ,   Politechnika Rzeszowska, Demidowski Krzysztof ,   Politechnika Rzeszowska
Published: May 2024

In the era of the burgeoning metaverse, integration of payment systems is becoming a key element to enable seamless and secure transactions in virtual environments. This paper focuses on an analysis of current payment solutions in the metaverse, as well as their challenges and future prospects. The first part of the paper discusses existing payment systems available in the metaverse, including cryptocurrencies, tokens and traditional payment methods, highlighting their impact on transaction dynamics and the perception of value in the virtual world. The main challenges of integrating these systems are then presented, such as data security, identity verification, complex processes for exchanging currencies (crypto and traditional), and interoperability issues between different virtual environments. In the final part of the paper we focus on the future of e-commerce in the metaverse, considering what technological innovations may affect the shape and nature of commerce in the virtual world, and what opportunities lie ahead for entrepreneurs and developers in terms of creating new business models. The conclusions of this publication highlight the importance of proper integration of payment systems in the metaverse for achieving sustainable and balanced e-commerce development in virtual environments, as well as underscoring the need for further research and innovation in this field to meet users’ growing expectations and provide them with secure and efficient payment methods.
Bank Lending as an Effective Way to Solving the Problem of Economic Development of Agricultural Enterprises
Authors:   National Scientific Center ", Andros Svitlana ,   Institute of Agrarian Economy",   National Academy of Agrarian Sciences of Ukraine
Published: May 2024

The relevance of the topic of the article is determined by the need to improve bank lending as an effective way to solve the problem of economic development of agricultural enterprises. The reasons behind the difficulty of lending to small agricultural enterprises have been identified. The general factors constraining lending to agricultural enterprises are examined. The analysis of the factors ensuring the formation of the credit services market was based on the assumption of the need for a balanced presence of conditions on the part of supply and demand factors. The reasons for the low effectiveness of government policy measures to create credit mechanisms are identified. Proposals have been formulated to increase the availability of credit in the context of the efficiency of banks serving agricultural enterprises. Measures have been proposed to improve credit support for the agricultural sector of the economy.
Anti-Crisis Transformation of Strategies of Business Structures and the Organizational and Economic Mechanism of their Implementation
Authors:   Odesа Polytechnic National University, Bavyko Oleksandr , Orshatskyi Dmytro ,   Odesа Polytechnic National University
Published: May 2024

The article presents the results of the analysis of scientific publications containing definitions and approaches to determining the content of strategy concepts, strategic and anti-crisis management, organizational and economic mechanism. It has been established that the high degree of negative impact of crisis factors determines the growth of exogenous determinism of business structure strategies, the reduction of planning time horizons and their acquisition of the functional content of anti-crisis management. The organizational and economic mechanism for the implementation of anti-crisis strategies acquires an additional functional purpose, which is related to the monitoring and assessment of military threats in the process of determining long-term and functional goals. The transformation of the economic component of the mechanism involves the optimization of the enterprise's business processes, which ensures its resistance to external destabilizing influences.
Ukraine’s Post-War Recovery: Key Steps and Experience of Leading Countries
Authors:   Odesа Polytechnic National University, Balan Oleksandr , Voitenko Maksym ,   Odesа Polytechnic National University, Pulcha Dmytro ,   Odesа Polytechnic National University
Published: May 2024

The Russian attack has brought heavy losses to the Ukrainian economy. At the beginning of January 2023, the government estimated them at more than USD 700 billion. The authors have examined the experience of restoring the German and Japanese economies after 1945. In the West and in Ukraine a new Marshall Plan is being talked about. The Ukrainian plan is USD 750 billion over 10 years, which is a multiple of the funds allocated to the FRG after 1945. It is planned to give money mainly for energy, access to finance, infrastructure and housing construction. Compared to investing in the ruined German economy. There are common features, but the "new Marshall Plan" is a conventional name. The Japanese experience is considered, i.e. cartels destruction and land distribution to small owners. The German experience is useful for Ukraine.
Business processes as an object of management of modern business structures
Authors:   Odesа Polytechnic National University, Bavyko Oleksandr , Faiengold Mykola ,   Odesа Polytechnic National University
Published: May 2024

Based on the systematization and generalization of scientific publications, the content characteristics of functional and process models of management are determined. It is established that the process model of management was formed in the conditions of the post-industrial period of economic relations development. The main factor in its formation was the introduction of automated and integrated management systems in the conditions of innovative development. A modern enterprise is considered as a set of business processes that consistently form a chain of added value creation. Management tasks in the field of business process management involve the formation of a system of main and auxiliary business processes, determination of their functions and relationships, standardization of the content and sequence of operations, ensuring interaction and control of efficiency.
Trade Wars and Their Impact on National Economies
Authors:   Odesа Polytechnic National University, Zadorozhko Glib , Kolesov Kostiantyn ,   Odesа Polytechnic National University
Published: May 2024

The article examines the impact of trade wars on the US and Chinese economies and their foreign economic relations. The analysis showed that throughout the considered period of 2016-2023, from the outside it looks like the US-China "war" is a normal trade dispute. China has declared its intention to become the sole leader in the world market not only of goods, but also of technologies. However, the real cause of the conflict is hidden in the global confrontation between the two leading economies, the purpose of which is the actual division of the world into new spheres of influence. To determine the impact of countries' exports on their GDP, appropriate regression models were built. The model for the USA showed that during the period 2000- 2021, the volume of exports from the USA to China had a decisive influence on the GDP of the USA. A similar model for China shows that the most powerful influence on China's GDP comes from the volume of its exports to the United States. Therefore, during the current part of the considered period, the economies of both countries are not only in a state of protracted trade war, but also depend on each other
Unveiling the Secrets of the Titanic through Logistic Regression
Authors:   a Instituto Superior de Educação e Ciências (ISEC Lisboa), Member of the Scientific Council of CIAC – Centro de Investigação de Artes e Comunicação, Lisboa, Portugal, Cunha Maria , Reis Diogo ,   a Instituto Superior de Educação e Ciências (ISEC Lisboa), Member of the Scientific Council of CIAC – Centro de Investigação de Artes e Comunicação, Lisboa, Portugal, Marquesa Margarida ,   a Instituto Superior de Educação e Ciências (ISEC Lisboa), Member of the Scientific Council of CIAC – Centro de Investigação de Artes e Comunicação, Lisboa, Portugal
Published: May 2024

Since the dawn of April 15, 1912, the world has witnessed the construction of larger ships, some already dismantled or resting at the bottom of the oceans, while others remain in circulation. However, none has achieved the same level of fame and significance in naval, literary, and cinematic history as the Royal Mail Ship Titanic. From 1912 to the present day, the Titanic has captured the imagination, fueling dreams and nightmares alike. The Titanic's story is widely known, and its data has been utilized in numerous studies, comprising records of various variables and natures, with generalizability to diverse situations. In this study, researchers will employ regression models, a vital statistical tool for analyzing relationships between variables. Specifically, the study aims to intricately describe the construction of such models using a dataset on the Titanic tragedy, while acknowledging its limitations. Understanding these limitations is essential for making informed decisions about when and how to utilize linear regression, and when alternative methods may be more suitable.
Application of Software in the Accounting of Budgetary Institutions: Advantages and Disadvantages
Authors:   Odesа Polytechnic National University, Shatskova Lyubov , Kvasha Kateryna ,   Odesа Polytechnic National University, Sibikovska Alina ,   Odesа Polytechnic National University
Published: May 2024

The article considers the application of software in the optimization of accounting processes of budget institutions. This study offers an overview of various software solutions used to automate budget accounting and financial management. The benefits of using the software are analysis, including improving the accuracy and efficiency of accounting processes, increasing transparency, and reducing the risk of errors. The article also considers the disadvantages of its use: possible problems related to data security, the cost of implementing and supporting programs. All these aspects allow you to get a complete overview of the use of software in the accounting of budget institutions, taking into account both positive and negative effects on the efficiency and quality of financial management.
Amazon açaí fibre–Portland cement compatibility: a challenge to produce cement-bonded fibreboards?
Authors: Oliveira Dhimitrius Neves Paraguassú Smith de , Souza Tiago Marcolino de , Ferreira Nilson dos Santos , Bezerra Jefferson Bezerra , Polidori Guillaume , Bufalino Lina
Published: May 2024

The açaí waste from the Amazon contains short fibres that show potential for reinforcing cement-bonded fibreboards (CBFBs), although their compatibility with the cement matrix is still unknown. The aim of this work was to characterise raw and pretreated açaí fibres and analyse their compatibility with Portland cement by different techniques, alongside developing a CBFB. The fibres were subjected to thermal (180, 200 and 220°C), cold and hot water, alkaline (NaOH) and bleaching (NaOH–H2O2) pretreatments. The chemical and water pretreatments raised the fibre crystalline indexes (28–57%). The chemical pretreatments individualised the fibre bundles and removed hemicelluloses. Alkali-pretreated and raw fibres had the highest (96%) and lowest (65%) cement compatibility indexes. Portlandite and ettringite appeared after 24 h for most pastes, but were delayed for raw and 220°C-pretreated fibres. In contrast, only the raw fibre specimens reached the required compression strength of 34 MPa after 28 days; hence, they were chosen to produce a CBFB. The boards showed proper thickness swelling (1.4%), but low bending strength (modulus of elasticity = 647.8 MPa; modulus of rupture = 1.9 MPa). Overall, the fibre modifications improved the compatibility with cement, but not the composite's mechanical strength. Açaí-fibre CBFB is a promising building material, but future studies must overcome its poor mechanical performance.
Influences of metakaolin and calcined clay blended cement on chloride resistance and electrical resistivity of concrete
Authors: Kijjanon Aunchana , Sumranwanich Taweechai , Tangtermsirikul Somnuk
Published: May 2024

There are many different grades of kaolinite clays around the world. Low-grade kaolinite clay is more abundant than high-grade kaolinite clay in various regions. To aim towards utilisation of low-grade kaolinite clay with an original kaolinite content of about 40% to produce calcined clay, the durability properties of concrete incorporating calcined clay produced from high-grade kaolinite clay or high kaolinite content (commercially available metakaolin or CC1) and calcined clay produced from a low-grade kaolinite clay (CC2) were investigated. Concrete mixtures were designed to have a water-to-binder ratio of 0.60. A fly ash-to-binder ratio of 0.20 and calcined kaolinite clay-to-binder ratios of 0.10 and 0.20 were studied. The chloride penetration resistance and electrical resistivity of the concrete were assessed and mercury intrusion porosimetry was utilised to evaluate its pore structure. The test results revealed that concrete with CC1 and CC2 exhibited superior chloride penetration resistance and chloride binding capacity than ordinary Portland cement and FA20 concretes. Moreover, using a higher calcined clay-to-binder ratio resulted in a more refined pore structure, which significantly enhanced the chloride resistance of the concrete. Although CC2 revealed a lower performance than CC1 in improving chloride resistance, its performance was superior compared to fly ash.
Undertaking risk assessments for Hong Kong reservoirs
Authors: Davis Alice M.
Published: May 2024

The 2013 RARS (risk assessments for reservoir safety management) guidance was developed for the Environment Agency to provide a robust three-tiered framework for the risk analysis, assessment and management of reservoirs in the United Kingdom. The methods presented can be used to assess a reservoir's risk in its entirety, either at a qualitative level (tier 1) or more in-depth quantitative levels (tiers 2 and 3). Binnies undertook RARS assessments of reservoirs for Hong Kong's Water Supply Department. This paper identifies the limitations and challenges encountered when applying the guidance in Hong Kong, beyond its original intended purpose. It outlines the adjustments made to assess the Hong Kong service reservoirs at tier 1, and large embankment and gravity dams at tier 2. Some of the differences include (i) how the nature of loading and external threats differs due to geographical and locational differences; (ii) how consequences of reservoir failure differ due to topology, population densities and cultural differences in the reservoirs’ uses and (iii) how the reservoirs are atypical from ‘Pennine’ type UK embankment dams, from which most UK empirical methods are derived.
Dunside reservoirs discontinuance: taking a new approach
Authors: Craig Matthew
Published: May 2024

Discontinuance of reservoirs, particularly those retained by ageing embankment dams, is becoming a common option for water companies who no longer need these assets for their water supply network. This paper will examine the discontinuance of Dunside Upper and Lower reservoirs, describing the novel aspects of the project, along with the method of project delivery, and how they contributed towards the success of the project. It will also describe the process for removal under the Reservoirs (Scotland) Act 2011, which in the case of complete removal of the reservoir is termed abandonment.
Evaluation of the correlation between cerebral hemodynamics and blood pressure by comparative analysis of variation in cerebral blood flow in hypertensive versus normotensive individuals: A systematic review and meta-analysis
Authors: Yang Lei , Du Hong , Zhang Xuejing , Zhang Dongliang , Su Xianhui , Qiao Zongrong , Gao Bulang
Published: May 2024

Current understanding of the cerebral vascular response to variations in blood pressure (BP) among individuals with hypertension is limited. The aim of this meta-analysis was to determine the correlation between hypertension, risk of stroke, and cerebral blood flow (CBF). We reviewed studies published between 2000 and 2023 from PubMed, Google Scholar, and Science Direct that compared mean CBF in normotensive (NTN) and hypertensive (HTN) patients. A random effects model was used to construct the risk ratio (RR), 95% confidence interval (CI), forest plot, and inverse variance weighting. Additionally, a mixed-effects meta-regression was employed to examine the impact of study-specific patient variables. This meta-analysis included eight prospective cross-sectional studies published from 2002 to 2023. It revealed a significant average difference in the standard mean CBF of −0.45 (95% CI −0.60 to −0.30, I2 = 69%, P < 0.00001), distinguishing NTN from HTN subjects. A RR of 0.90 (95% CI 0.63 to 1.30, I2 = 89%, P = 0.04) indicated a significant decrease in CBF among individuals with hypertension. We found a statistically significant relationship between changes in diastolic and systolic BPs and the mean CBF (R −0.81, P = 0.001 and R = −0.90, P = 0.005, respectively). Our research demonstrates a strong relationship between elevated BP and reduced CBF, with hypertension reducing CBF compared to NTN individuals, by increasing cerebrovascular resistance.
DETERMINING ROCK FRAGMENT SIZE DISTRIBUTION USING A CONVOLUTIONAL NEURAL NETWORK
Authors: Sharifi Elmira , Farsangi Mohamad Ali Ebrahimi , Mansouri Hamid , Rashedi Esmat
Published: May 2024

Fast and relatively accurate determination of the fragment size distribution of a muck-pile is still a challenge in mining operations and the existing measurement methods are inefficient. In this research, a new algorithm to determine fragment size distribution due to blasting was presented, using the image processing technique. In the newly proposed approach, delineating of the fragmented rock particles, as the main core of processing, was carried out, using a convolutional neural network. Two networks were defined and trained by 150 laboratory and 150 field data images. Also, 30 laboratory and 30 field data images were applied to carry out the validation visually, and by using F1-scores. For the two laboratory and field networks and results obtained by Split-Desktop software automatic edge detection on the same images, the F1-scores are equal to (0.98, 0.74) and (0.99, 0.85) respectively. Also, for determination of fragment size distribution by laboratory data network and Split-Desktop software automatic edge detection on the same images, the Root Mean Square Error (RMSE) for F30 and F80 are equal to (0.36, 1.20) and (0.31, 1.24) respectively. These indicate better performance of the proposed approach for both rock edge detection and fragment size distribution over Split-Desktop software automatic edge detection.
SIMULTANEOUS EVALUATION OF CRITERIA AND ALTERNATIVES FOR MINING METHOD SELECTION (CASE STUDIES: GOL-E-GOHAR NO. 3 IRON ORE AND CHAHAR-GONBAD COPPER ORE)
Authors: Namin Farhad Samimi , Amou Abbas
Published: May 2024

Selecting a mining method is an essential step in the initial phases of mining. The selection of an inappropriate mining method can have consequences, such as the potential loss of a portion of the ore deposit. Sometimes, changing the mining method can result in high costs that render the entire project economically unfeasible. For the past two decades, qualitative patterns and numerical scoring have been replaced by multi-criteria decision-making methods. In this study, the Simultaneous Evaluation of Criteria and Alternatives (SECA) multi-criteria decision analysis method was introduced for the first time in the selection of mining methods. The SECA was used to select the mining method in two ore bodies: Gol-E-Gohar No. 3 Iron ore and Chahar-Gonbad Copper ore. The final ranking compared with the results obtained from the fuzzy TOPSIS decision-making method. The satisfactory results indicated that the open-pit method was selected as the appropriate approach for both cases. The SECA method has lower computational complexity because it does not require the use of weight vectors as inputs. However, it does require a precise decision matrix. This method can be considered the foundation of artificial intelligence for selecting a mining method.
A REVIEW OF CHAN PLOT APPLICATION AND RECENT ADVANCED MODELS FOR DIAGNOSING EXCESSIVE WATER PRODUCTION
Authors: Hamdoon Ahmed , Mohammed Mohammed , Elraies Khaled
Published: May 2024

Water is one of the major fluids associated with the operational cycle of the oil industry that must be carefully considered due to its environmental, treatment facility, and economic impacts. Over the years, various methods have been developed to identify excessive water production. These methods range from reliable and expensive ones, such as well-logging records, to less accurate methods that utilize available production and water-oil ratio data, such as the Chan plot. The Chan plot emphasizes that well production can exhibit various patterns of excessive water production, including constant water-oil ratios, normal displacement, channeling, and coning. However, manual interpretation of these plots is often confusing due to the noise present in the actual data. Machine learning models have improved interpretation accuracy, but limitations remain in detecting evolving water production patterns. This paper reviews the application of Chan plots and their integration with existing diagnostic tools for diagnosing excessive water production. It then focuses on a recent advanced model that leverages machine learning specifically designed to improve the interpretation of Chan plots. The review highlights the limitations of traditional interpretation techniques and explores how the recent advanced model can address these limitations. Additionally, the paper briefly discusses the potential of an interactive model for the continuous monitoring of water production patterns. Finally, the paper offers recommendations for future research directions.
EFFECTS OF POROSITY ON THE STRENGTH AND MECHANICAL BEHAVIOUR OF POROUS GEO-MATERIALS UNDER CYCLIC LOADING
Authors: Dalirnasab Abolfazl , Marji Mohammad Fatehi , Nejati Hamid-Reza , Mohebi Mohsen
Published: May 2024

Most rocks in nature are porous and usually saturated with different fluids such as water, oil, and gas. The conventional and unconventional hydrocarbon reservoirs are mainly associated with sedimentary formations. The main rocks of these reservoirs are sandstone (porous rock), limestone and oil shale (tight rock), which are associated with varying porosity. Hence, porosity serves as a fundamental parameter for most reservoir rocks. In this research, the effect of porosity on the mechanical behaviour of geo-materials and its fatigue behaviour was investigated. For this purpose, a total of five geo-material sample groups with varying porosities were prepared and designated, i.e. groups A, B, C, D, and E. Group A exhibited the highest porosity 20-21.5%, while group E had the lowest porosity 2-3%, respectively. The conventional quasi-static strength tests and cycle loading tests with constant frequency and amplitude were performed on the samples and different results were obtained. The samples belonging to group E, with the lowest porosity (2-3%), exhibited the highest mechanical strength, elastic modulus and fracture toughness values and the lowest Poisson's ratio compared to those of higher porosity samples. During the cyclic loading period, the fatigue stress-life graph of the E group has the lowest slope compared to the other groups. It means that the slope of the graph increases as the porosity increases in all groups. Therefore, the E group has the lowest porosity and the longest fatigue life time, i.e. porosity and fatigue resistance have an inverse correlation.
SEAMLESS PRECISE KINEMATIC POSITIONING IN THE HIGH-LATITUDE ENVIRONMENTS: CASE STUDY IN THE ANTARCTIC REGION
Authors: Alkan Reha Metin , Selbesoğlu Mahmut Oğuz , Yavaşoğlu Hasan Hakan , Arkalı Mehmet
Published: May 2024

Scientific activities in the Antarctic regions have increased daily within the last decades to achieve many different projects. The ice sheet over 98% of the Antarctic continent, the coldest, driest, and windiest place in the world and has the largest desert, makes it very difficult to conduct any kind of study and research. Among them, precise hydrographic surveying should be conducted for many different applications that require reliable and accurate positioning. The output from these surveys plays a vital role in understanding sea level changes, global warming, sea ice movement, navigation and many others. The harsh atmospheric and topographic conditions of the region pose additional challenges to surveyors in the use of conventional terrestrial measurement techniques and satellite-based positioning methods (GNSS) to make positioning. Low quality and noisy GNSS observations with low satellite elevations made their positioning vulnerable to cycle slip, multipath, and discontinuity in Antarctica. This study analyses the performance of the post-processed kinematic Precise Point Positioning (PPP) based on the web-based online GNSS processing service for marine surveying in the high-latitude environment. Within this frame, two realistic experiments were carried out on a ship and zodiac boat during the 6th Turkish Antarctic Expedition (TAE). The results show that the PPP coordinates using an online GNSS processing service provide kinematic positioning with centimetre level of accuracy using a single GNSS receiver. The general results showed that the PPP technique allows for much faster and accurate positioning in remote and high-latitude areas at a lower cost.
LABORATORY INVESTIGATION OF THE EFFECT OF SODIUM SILICATE AND BENTONITE ON THE MECHANICAL PROPERTIES OF THE GROUT BEHIND THE SEGMENT IN MECHANIZED EXCAVATION
Authors: Khoshzaher Erfan , Khodaei Samaneh , Chakeri Hamid
Published: May 2024

Nowadays, the use of Tunnel Boring Machines (TBM) in tunnelling has increased in urban environments. One of the effective parameters in the excavation process is the use of grout behind the segments to prevent ground settlement and penetration into the tunnel. The investigation of the effects of two-component grout (bentonite and sodium silicate) on the mechanical properties of the grout plays a crucial role in mechanized excavation. Therefore, this article aims to investigate the effect of various parameters on the properties of the two-component grout. Eight different mixing designs were considered in this research. Gel-time tests, viscosity test, water bleeding test, uniaxial compressive strength tests (UCS), and direct shear tests were conducted for each mixing design. The UCS tests were performed for eight mixing designs and at four different ages of the grout, while the direct shear test was conducted for five mixing designs at the age of one day. The results showed that increasing the sodium silicate content from 4% to 9.4% reduced the Gel-time to 7 seconds, and increasing the bentonite content from 2.3% to 4.58%, increased the marsh funnel time to 12 seconds. The uniaxial compressive strength of the grout increased to 0.682 MPa at the age of 28 days. Finally, by conducting the direct shear test on the grout and obtaining the parameters of cohesion and internal friction angle, it was determined that these two parameters depend on the values of bentonite and sodium silicate, and they change with the increase or decrease of these grout components.
NUMERICAL ANALYSIS OF BOREHOLE HEAT EXCHANGER PERFORMANCE IN SHALLOW GRAVEL AQUIFERS AND CLAY-DOMINATED SOIL
Authors: Lekić Brettschneider Amalia , Perković Luka
Published: May 2024

The performance of geothermal heat extraction in shallow aquifers depends on both Borehole Heat Exchanger (BHE) and soil or aquifer properties. In this work, an analysis of the thermal yield of a shallow geothermal reservoir was made numerically with the finite element method used to simulate heat and mass transfer in the three-dimensional reservoir. The main parameters for analysis which have been considered are the geometry and physical parameters of the BHE and grout, as well as aquifer matrix and groundwater fluid. Physical parameters are thermal conductivity, flow conductivity, expansion coefficient, porosity, volumetric heat capacity, anisotropy and dispersivity. The numerical tests have been performed in single BHE line source configuration representing numerically modelled thermal response test for the estimation of sustainable heat extraction. The domain size was a 100x100 meter rectangle with a depth of 200 meters. Three main lithological configurations have been modelled: gravel aquifer with low and high convection of groundwater fluid, as well as a shallow geothermal reservoir dominated by clay material without convection. For selected cases, the analysis for temporal and spatial discretization was also made. Three-dimensional transient modelling was made in FEFLOW® software with pre- and post-processing done in user-defined Python scripts. The results show the most influential parameters to be considered when setting up the real case simulation of geothermal heating and cooling, as well as optimal temporal and spatial discretization set-up with respect to expected thermal gradients in the reservoir.
DETERMINATION OF LAKEBED SEDIMENT DISTRIBUTION BASED ON UNDERWATER ELECTRICAL RESISTIVITY TOMOGRAPHY DATA
Authors: Orešković Jasna , Kolar Saša , Brcković Ana , Pavičić Ivica
Published: May 2024

Electrical resistivity tomography (ERT) in an aquatic environment is usually measured using two basic systems. One system uses floating electrodes, which is usually applied in shallow water, and the other uses underwater cables with integrated electrodes, which is often carried out as a mobile system. The aim of this research was to test an underwater ERT measurement with floating cables on the water surface, but with electrodes submerged at the water bottom. This type of cable spread makes it possible to lay all the electrodes vertically to the bottom without the distance between them being reduced by the uneven topography and various underwater obstacles. Prior to the field survey that was conducted in a 40 m – deep lake, the response of common electrode arrays was tested using synthetic models. Two models were used that correspond to the geological condition in the field, higher resistivity bodies in a lower resistivity environment and a model with inverse relationship of resistivity to the first one. The Wenner Schlumberger and dipole-dipole arrays resolved the resistivity range, size and shape of the bodies very well and were therefore used in the field. The field data quality was very good and it was shown that ERT measurements in freshwater depths of more than 40 metres can provide very good results. As expected from the modelling, the dipole-dipole array led to a high-resolution resistivity model that enabled the characterisation of the lakebed sediments.
Rhamnopyranoside Pivaloyl Esters as Black and White Fungus Inhibitors: Molecular Docking, Dynamics and ADMET Analysis
Authors: Matin Mohammed Mahbubul , Kumer Ajoy , Chandro Akhel , Akash Shopnil , Chakma Unesco
Published: May 2024

The "Black and White Fungus" is a very infrequently developing pathogen with a high fatality rate that has prompted widespread public health concern during the period of the COVID-19 pandemic. This pathogenic fungus may be widely distributed in nature, in plants, and in deteriorating fruits and vegetables because of its widespread nature. Numerous sugar molecules, such as glucopyranoside and glucofuranose, have been reported to have significant antibacterial, antifungal, and antiviral activity, and they were also revealed to be able to inhibit multidrug-resistant microorganisms. The recent black fungus epidemic was extremely serious in India, combined with COVID-19, which contributed to the high mortality impact and deterioration of the situation due to the unavailability of effective treatments. So, rhamnopyranose type derivatives 1–9 were studied against the proteins associated with black and white fungi such as Mycolicibacterium smegmatis (PDB ID 7D6X), Rhizomucor miehei (PDB ID 4WTP), Candida auris (PDB ID 6U8J), and Aspergillus luchuensis (PDB 1BK1). These compounds exhibited favorable physical and biochemical scores, as well as appropriate ADMET metrics, among other characteristics. Following the molecular docking procedure, it was found that 1–9 had the highest binding affinity in most cases, (> -6.00 kcal/mol), while compound 9 had outstanding binding affinity against Rhizomucor miehei (-8.7 kcal/mol) and against Mycolicibacterium smegmatis (-8.2 kcal/mol). In addition, the binding affinity against white fungus is also outstanding. This time, compounds 8 and 9 had better binding energy, which is -7.8 kcal/mol against Aspergillus luchuensis (1BK1) and -7.6 kcal/mol against Candida auris (6U8J). Finally, the molecular dynamics simulation at 100 ns has proved that they are stable for new medication development. Among the derivatives 1–9, ligands 8 and 9 exhibited potential medicinal characteristics when all of the data were considered.
Development of Learning Media Integrated Module Application Based on Socio-Scientific Issues Enriched Augmented Reality on Electrolysis Cell Material
Authors: Kurniawan Dhimas Bagus , Sumari
Published: May 2024

This study aims to develop learning media integrated module applications based on socio-scientific issues enriched by augmented reality on electrolysis cell material and test the feasibility and validity of chemistry learning media products developed. The research method used is research and development (R&D) using the 3D model adopted from the 4D model developed by Thiagrajan et al. (1974: 5), which consists of 3 stages, namely: define, design, and development. This research is only limited to the development stage. The instruments used in this research are validation and readability test questionnaires. The validators consisted of 2 people, namely one lecturer from the Chemistry Department of the State University of Malang and one chemistry teacher from SMAN 2 Batu, as media and material experts. The readability test was conducted on 29 undergraduate students of the Chemistry Education class 2022 at the State University of Malang, assuming they had taken the subject during class XII in senior high school. The results showed that the validity of the material and media included very feasible criteria with 98.24% and 96.81%, respectively, in addition to the average of all aspects of the readability test assessed having a percentage of 91.77%.