bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling islamic marketing research using VOSviewer application: A bibliometric analysis
Authors: Jumansyah Rizky , Natasha Puspa Dewi  , Eddy Soeryanto Soegoto  , Senny Luckyardi  , Alshiqi Sevdie
Published: January 2023

This study aims to carry out a bibliometric analysis on Islamic marketing using the VOSviewer program. This study uses a quantitative descriptive method. The data used in this study are search results based on the keyword "Islamic Marketing" sourced from Google Scholar using publish or perish software. From the search results, we found 1000 articles published in the 2018-2022 range. The results show that research on Islamic marketing increased in 2019 and 2020 but decreased significantly in 2022. In conclusion, this study is needed to demonstrate the significance of undertaking bibliometric analysis, particularly in the area of Islamic marketing. It is expected that this study will serve as a model for future research in terms of conducting and identifying research topics, particularly in the field of Islamic marketing.
New Forms of Employment in Regional Labor Markets (Exemplified by Regions of the Southern Federal District)
Authors:   Volgograd Institute of Management, Branch of the Russian Presidential Academy of National Economy and Public Administration, Ivanova Tatiana , Mitrofanova Inna ,   Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences
Published: January 2023

The article analyses the relationship between the concepts of platform employment and gig economy. The development of new types of employment is justified. They are permanent platform and Giger platform. 22 online platforms (taxi ordering, delivery, freelance exchanges, and marketplaces) and data on their presence in the regions of the Southern Federal District were analyzed. It was found that new types of employment are found in all regions. It is mainly represented by the Giger platform. The factors limiting and expanding permanent platform employment are determined. The ambiguous influence of platform employment on regional labor markets is shown. To a greater extent, it is developing in large cities with sufficient solvent demand. For the regions of the Southern Federal District, these are Krasnodar, Rostov-on-Don, Volgograd (only administrative centers were taken, Sochi, Taganrog, Volzhsky were not analyzed specifically). To create additional jobs due to this, it is necessary to have the following: concentration of the population in a certain territory, consumer demand for the purchase of non-priority services, a high level of education, capable of ensuring the interest of customers in attracting performers from a specific locality. These factors require additional study, but, nevertheless, the analysis shows that in order to increase the positive impact of platform employment and gig economy on regional labor markets, adjustments to the strategies of social and economic development of territories are necessary, which is possible, including using the potential of national projects.
Conceptualization for Decision-Making on Circular Economy Development in the Russian Black Sea Regions
Authors:   Southern Federal University, Nikitaeva Anastasia , Chernova Olga ,   Southern Federal University, Dolgova Olga ,   Southern Federal University
Published: January 2023

The specifics of the Russian Black Sea regions, manifested in the presence of a large number of opportunities and contradictions in the implementation of social and economic and environmental aspects of sustainable development, requires the search for new rational models of resource use. The most promising in this regard are the models of the circular economy. In accordance with this idea, this article is aimed at identification of the directions and levels of managerial decision-making for the development of a closed-cycle economy in the regions of the Russian Black Sea regions, taking into account the need for informational and analytical support for the relevant regulatory and self-regulatory processes. The study provides a detailed description of the specifics of economic potential of coastal territories of Krasnodar Krai and Rostov region. The paper shows that tourism and recreation, agriculture, and marine economic activity are important in the economy of the Russian Black Sea region. The priority is the development of industrial and port facilities that provide export-import operations. At the same time, there is a fragmentation of social and economic components of these territories and their selective development. Taking this fact into account, priority areas of application of circular models were identified: environmental regulation of the processes of social and economic development of coastal territories; efficiency improvement of marine economy; removal of restrictions and activation of growth points of the Russian Black Sea regions. This made it possible to structure the elements of the circular economy and measures for their implementation, as well as to build a simulation model of the interaction of industries in the Russian Black Sea regions. The analysis of the model showed that, despite the close interconnection of various industries, the process of circularization is not yet working on a regional scale, but there are prospects for the development of circular value chains. In accordance with this, indicators for monitoring the development of a closed-loop economy in relation to the levels of managerial decisionmaking were suggested. The framework of decision-making on the development of circular economy in the Russian Black Sea regions established in the work allows us to focus state policy on the implementation of plans that allow us to get closer to the achievement of the goals of regional sustainable development.
Structural and Dynamic Model of Transport Effects of Economic Growth (Case of Rostov Region)
Authors:   Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Patrakeeva Olga
Published: January 2023

The removal of infrastructural restrictions on economic growth for regions and economic sectors is a priority for Russia. The relevance of the problem of transport effects assessment at the regional level is increasing due to the high depreciation of the existing infrastructure as well as the necessity of creating new facilities that can become a determining factor for economic dynamics acceleration. The paper is devoted to methodology development for the impact assessment of transport infrastructure on the economic development of territories, model tools development for effects’ assessment and their testing experimentally in the case of Rostov region, whose economic growth rate showed an obvious slowdown in recent years. The Rostov region’s model made it possible to obtain a series of probabilistic assessments of scenarios for social and economic development, the outcome of which depends on the implementation of investment activity scenarios and forecasts, dynamics of passenger and cargo flows, and provision of the territory with road and rail infrastructure. Estimations showed that an increase in the index of investments in fixed assets and the share of investments in the “transport” sector in the total volume of investments in fixed assets, accompanied by road quality improvement, stimulates growth of gross regional product and turnover of road transport. At the same time the freight turnover of rail transport has a positive relationship only with the investment index. The significant contribution to the economic growth of Rostov region in 2000–2020 years was connected with the long-term investment multiplier that formed the structure of traffic flows in the value chain. Quantitative estimates of the effects of investments intransport infrastructure can be taken into account in development programs of Rostov region to justify strategic goals and specific objectives of regional development.
Strategic Planning Adaptation at Industrial Enterprises to Transformational Shocks
Authors:   Financial University under the Government of the Russian Federation, Brizhak Olga , Baranovskaya Nina ,   Anapa branch of the Russian State Social University in Krasnodar Krai
Published: January 2023

The purpose of the article is to define the concept of systemic transformation and adaptation of the process of strategic planning of agricultural engineering enterprises to transformational shocks under external constraints. To achieve this goal, the key tasks of strategic planning of agricultural enterprises under the conditions of external constraints and transformational shocks are identified. The criteria for choosing an object of study are determined. The principal arguments for the need to adapt industrial enterprises to the conditions of transformational shocks are shown.The enterprises of agricultural engineering of the South of Russia, functioning as a cluster, were chosen as the object of the study. The internal and external environment of agricultural engineering enterprises in the South of Russia is revealed on the example of a cluster in Krasnodar Krai. The advantages of the development of agricultural engineering industry in the specified region are shown; the factors of negative shock influence and systemic effects on the development of a cluster of agricultural engineering enterprises in Krasnodar Krai are identified. With the help of the methodology for express assessment of the economic sustainability of industrial enterprises in the agricultural sector, as well as by illustrating the modernized production function, the cluster of agricultural engineering enterprises in Krasnodar Krai is defined as a protocluster. Methods and methodology. Within the framework of this study, the methods of systemic and comparative analysis, integrative planning, the author’s method of construction of a modernized production function, method of harmonic linearization, dialectical method, method of empirical observations, and survey method were used. The research methodology is presented by cognitive opportunities of the theory of system economics, theory of transformation, theory of strategic planning, and theory of creative economy. The heuristic potential of interdisciplinary research theory is used. Suggestions are made to ensure the conditions for the adaptation of industrial enterprises to changing political and economic conditions and competitive development of the cluster of agricultural engineering enterprises in Krasnodar Krai.
Interregional Industrial Cooperation as a Resilience Condition of Regional Economic Development
Authors:   Southern Federal University, Vasilatii Oleg
Published: January 2023

The pronounced negative impact of the external environment on economic processes in the Russian economy actualizes the tasks of the identification of factors and conditions that would allow maintaining the sustainability of its development. The subject of this article is the problem of instability of the economic system functioning as a result of non-economic external influence. The aim of the paper is to study the possibility of preventing or reducing the negative impact of environmental factors on the stability of regional economies. The article analyses the factors determining the stability of the economy. These factors are assessed through the economic category “resilience of the economic system”. At the same time, the emphasis is placed on the potential of interregional industrial cooperation of various countries creating an autonomous (in the institutional aspect) economic system. The article substantiates that the resilience of the economy is determined not only by the degree of its competitiveness and adaptability, but also by control of market institutions providing industrial commodity exchange (for relatively large economies) and stability of access to market institutions (for small economies). The composition of the institutions providing industrial commodity exchange determines the fact that the autonomy of the economic system becomes possible only when a certain scale of domestic demand is reached (for this system). In this situation, the development of integration processes becomes relevant for the regions of the Russian Federation and a number of friendly states. The paper suggests a model of interregional industrial cooperation on the example of the potential of organization of mutually beneficial trade relations between economic entities in the regions of Southern Russia and Pridnestrovie. It is shown that the implementation of this model will significantly increase the level of resilience of the economies of interacting regions. It is concluded that it is advisable to develop the processes of industrial interregional cooperation not only internationally, but also at interregional level.
Power Distance, Collectivism and Corruption: An Analysis Using Hofstede’s Cultural Dimensions Index and Corruption Perception Index
Authors:   The Korea International Trade Research Institute, Jun In-Woo , Kim Kyoung-In
Published: January 2023

Purpose – Among the many factors affecting corruption, cultural factors cannot be overlooked. This study examines if there is any relationship between culture and corruption. For this purpose, Hofstede’s cultural dimension index and the Corruption Perception Index (CPI) for 116 countries were used. Design/Methodology/Approach – This study used secondary data published by two institutions: Hofstede Insights and Transparency International. First, the latest Power Distance Index (PDI) and Individualism Index (IDV) of 116 countries were obtained from Hofstede Insights. Second, the latest 2021 CPI of 116 countries was gained from Transparency International. Two hypotheses were developed. To examine the relationship between the variables, a correlation analysis was adopted. Findings – According to the analysis results, hypothesis 1 received statistical support indicating more corruption tends to occur in countries with high power distance culture. Hypothesis 2 is also accepted that more corruption occurs in countries with a strong collectivism culture. Research Implications – The result of this study implies that centralization of power into the higher echelons may hinder effective communication within organization, and often leads to strategic decision-making errors and even corruption. In addition, excessive in-group collectivism is an obstacle to monitoring and blocking internally generated corruption and sometimes demands individual sacrifice.
The Impact of Economic Outlook of the Manager on Firm Value
Authors:   The Korea International Trade Research Institute, Park Ji-Yun , Yim Byung-Jin , Seo Yong-Jun
Published: January 2023

Purpose – In this study, we analyzed the relationship of manager predictions of the economic outlook on firm value. Design/Methodology/Approach – The manufacturing sector listed on the KOSPI market from 2006 to 2019 was selected as a sample. We used Tobin’s Q as the dependent variable and the BSI index as the independent variable for panel analysis. In addition, we subdivided the analysis to check whether there are differences in the economic outlook of managers by manufacturing, region, and industry. Findings – We confirmed that manager predictions of economic outlook have a significant effect on firm value. In particular, we confirmed that managers take action to increase firm value by thoroughly preparing for economic downturn in terms of sales and industry conditions. Research Implications – Our study is the first attempt to analyze the relationship between manager predictions of economic outlook on firm value. In addition, our study makes investors aware of the importance of predicting the economic outlook of managers and suggests a new investment decision index.
The Effect of Empowering Leadership on Job Engagement and Innovative Task Action of Organization Member
Authors:   The Korea International Trade Research Institute, Lee Do-Hyung
Published: January 2023

Purpose – This research shows the understanding of influencing relationship between empowering leadership and innovative task action and job engagement, to the office workers in corporation and provides implements based on the mediating role in job crafting and those relationships Design/Methodology/Approach – To verify this, the survey was given to office workers in domestic corporation. Total 200 copies were given, and AMOS 21.0 was used to statistical analysis. Findings – Empowering leadership was found to have a positive effect on innovative task action, job engagement, and job crafting. Job crafting was found to have a positive effect on innovative task action, job engagement. Job crafting was found to have a complete mediating effect in the relationship between empowering leadership, innovative task action, and job engagement. Research Implications – For the success of the organization, leaders must exercise empowering leadership to empower members of the organization to make decisions on their own and give them the opportunity to challenge new tasks
Processing of finely dispersed technogenic raw materials for aluminum production in order to extract valuable components
Authors: Nemchinova N. V. , Barauskas A. E. , Tyutrin A. A. , Vologin V. S.
Published: January 2023

The paper provides the results of experiments on the hydrometallurgical processing of finely dispersed technogenic raw materials for primary aluminum production in Soderberg cells (case study of the Irkutsk Aluminum Smelter) – aged sludge. The components of this sludge are dust from electrostatic precipitators (79.7 %), wet gas cleaning sludge (4.4 %) and coal froth flotation tailings (15.8 %). According to the grain-size analysis carried out, aged sludge sample particles have a size of –50 μm. According to the chemical composition analysis of the sludge sample, main components in it are carbon, cryolite, chiolite with a small amount of other compounds (corundum, ralstonite, spodumene, fluorite). Fluorine leaching experiments were carried out with a 2 % sodium hydroxide solution at a stirrer speed of ~1020 rpm. Using the mathematical planning of a three-factor experiment, it was found that the maximum concentration of fluorine in the solution (15.844 g/dm3) is achieved with the following optimal parameters of fluorine alkaline leaching: temperature of 90 °C, liquid-to-solid ratio of 9 : 1, and time of 90 min. The multidimensional polynomial equation was obtained for fluorine alkaline leaching from aged sludge. Cryolite was obtained from fluorine-containing solutions (by the reaction of sodium fluoride interaction with sodium bicarbonate and an aluminate solution), which was confirmed by X-ray phase analysis data.
Influence of Ti, Sr and B additions on the fluidity of A356.2 aluminium alloy
Authors: Bazhenov V. E. , Baranov I. I. , Titov A. Yu. , Sannikov A. V. , Ozherelkov D. Yu. , Lyskovich A. A. , Koltygin A. V. , Belov V. D.
Published: January 2023

Nowadays, aluminum alloys with silicon are the most widespread construction materials. To increase the mechanical properties of aluminum alloys, modifying by Sr, Ti, and B are used. However, in the foundries, when using scrap and secondary aluminum alloys, the modifying elements are accumulated in alloys in the form of intermetallic particles that decrease castability. This is because of the modifiers have a short time effect and are not activated when remelting. Hence it is necessary to add the modifiers without reference to intermetallic particles that are exactly presented in the melt. This work investigated the effect of Sr, Ti, and B additions on A356.2 aluminum alloy fluidity obtained by vacuum fluidity test. It was shown that when AlSr10 and AlTi5B1 commercial master alloys are used (up to 0.3 wt.% Sr and 0.5 wt.%Ti), no fluidity decrease is observed. However, adding the same quantity of Ti with the homemade AlTi4 master alloy leads to a considerable fluidity decrease. With the help of scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), the microstructure and phase composition of master alloys and A356.2 alloy after the addition of mentioned master alloys were investigated. Additionally, Thermo- Calc software evaluated the influence of modifier additions on alloy phase composition and phase transition temperatures. It was established that the influence of the modifier additions on the fluidity of the A356.2 alloy is connected with the shape and size of crystals that contained modifier elements in the structure of the master alloy. When the coarse crystals of that phases are present, these crystals’ incomplete dissolution is possible, inhibiting the free melt flow.
Structure and wear resistance of coatings produced by the short-pulse laser alloying of titanium carbohydride-based mechanocomposites
Authors: Eryomina M. A. , Lomayeva S. F. , Kharanzhevskiy E. V.
Published: January 2023

The study covers the phase composition, morphology and properties of coatings deposited on steel by means of short pulse selective laser alloying of titanium carbohydride-based mechanocomposites. Mechanocomposites were fabricated by milling of Ti and Ti–Cu powders in a liquid hydrocarbon environment. The synthesized mechanocomposites and fabricated coatings are investigated by X-ray diffraction, scanning electron microscopy and optical microscopy. The phase composition of mechanocomposites is represented by titanium carbohydride phase with a size of powder particles ranging from 2 to 30 μm for powders without copper, and from 1 to 10 μm for copper-containing powders. Coatings fabricated from powder mechanocomposites have a gradient structure. The Ti(C,H) powder coating contains 48 vol.% of the titanium carbide phase in a shell of Fe–Ti intermetallic compounds. The Ti(C,H)–Cu powder coating contains 85 vol.% of titanium carbide inclusions surrounded by Ti(Fe,Cu) and CuTi2 phases. Round-shaped carbide inclusions formed have a size of 50 to 200 nm, and dendritic ones are up to 5 μm. Coatings have a microhardness of 10 GPa and 8 GPa for compositions without and with copper, respectively. Coatings were tested for wear resistance under the conditions of dry friction in pairs with the balls made of steel and VK6 tungsten carbide alloy. Coefficients of friction for both coating types are 0.16–0.3 with the ball made of VK6 tungsten carbide alloy and 0.2–0.4 with the ball made of hardened steel. Coatings almost do not wear out under the counterbody load of 10 N and testing time of 20 min.
The effect of electrospark deposition using zirconium electrodes on structure and properties of nickel-containing alloy obtained selective laser melting
Authors: Kudryashov A. E. , Kiryukhantsev-Korneev Ph. V. , Mukanov S. K. , Petrzhik M. I. , Levashov E. A.
Published: January 2023

Protective coatings were applied by electrospark deposition (ESD) using zirconium electrodes to improve the performance of the Ni-containing alloy obtained using the selective laser melting (SLM) technology. The kinetics of mass transfer was studied in 5 different frequency-energy processing modes. An analog-to-digital converter was used to determine the average number of pulse discharges, single-pulse energy, and the total energy of pulse discharges for 1 min of processing (ΣЕ) for all the modes used. In low-energy processing modes (ΣЕ = 1459÷2915 J), a weak mass transfer was observed, and the cathode weight gain was recorded only in the first minutes. As the processing time increased, a decrease in the substrate weight was observed. The roughness of coatings (Ra) varied in the range of 3.9–7.2 μm. In high-energy modes (ΣЕ = 5197÷17212 J), due to intense electrode heating, a steady cathode weight gain was observed, but the formed coatings featured by increased roughness: Ra = 7.4÷8.6 μm. The Ra parameter for the original SLM samples was 10.7 μm. The formed coatings featured by a thickness of 15–30 μm, high continuity (up to 100 %), hardness of 9.0–12.5 GPa, elastic modulus of 122–145 GPa, and friction coefficient of 0.36–0.49. The ESD processing promoted an increase in wear resistance of the SLM alloy by 7.5–20 times, and oxidation resistance by 10–20 % (t = 1150 °C, τ = 30 h). It was found that the coating obtained in the low-energy ESD mode with energy ΣЕ = 2915 J featured the best performance (hardness, modulus of elasticity, roughness, wear resistance and oxidation resistance).
Features of the impact of hot isostatic pressing and heat treatment on the structure and properties of maraging steel obtained by selective laser melting method
Authors: Kayasova A. O. , Levashov E. A.
Published: January 2023

Using the SLM method in a nitrogen blanket with heating to a temperature of 200 °C, samples were obtained at a position of 0° against the build plate. The effect of the hot isostatic pressing (HIP) and heat treatment (HT: hardening + aging) on the structure and mechanical properties of maraging steel CL50 WS was studied (the Russian analogue is ChS4 grade). To analyze the effect of post-processing on the strength characteristics (σb, σ0,2, δ, ψ), tensile tests were conducted. Their results indicated high values of strength and ductility. It has been established that as a result of HT in the steel structure, in addition to α-Fe, γ-Fe, dispersed precipitates of the NiTi3 strengthening phase are formed, the identification of which was carried out by high-resolution transmission electron microscopy. Through the NiTi3 intermetallic phase, the steel has acquired increased tensile strength and yield strength required for the production of critical components and parts for highly loaded turbomachine disks. The change in the porosity of the samples before and after the HIP was analyzed. The microstructure of the samples and the changes that occur under the influence of various post-processing options are studied. The fine-grained homogeneous structure obtained by combining the SLM, HIP and HT provided optimal strength and ductility. Analysis of fractures after mechanical testing showed that the samples after postprocessing are destroyed according to the viscous-pitting mechanism with the formation of a neck.
The effect of open innovation mindset on absorptive capacity: the mediation role of entrepreneurial alertness
Authors: Salehi Nader , Asrar Mohammad Medhi
Published: January 2023

Purpose- Applying new information across corporate borders is a strategy for innovation that uses absorptive capacity. In organizational research, the term open mindset is used to define a firm's ability to understand and accept new concepts or to critically evaluate its experience with new knowledge. The shift inflow or outflow initiative and notion advocated for this tactic. Applying opportunities for creation through innovation is the action of the entrepreneurial attentiveness. An evaluation of a firm's intelligence results from assessing the open mindset of individuals who perceive, evaluate, and seize new chances in contact with the environment. The purpose of this research is to investigate the impact of an open innovation mindset on the absorption capacity in small and medium-sized enterprises with the mediating role of entrepreneurial alertness.
Methodology- The statistical population includes 430 managers of small and medium-sized businesses producing industrial, utility, and construction pumps. The sample size is 131 firm managers. In this research, the data collection tool is a questionnaire that has been distributed and collected using a non-probability sampling method. The validity and reliability of the questionnaire were evaluated during the pre-test. Smart PLS and SPSS software were also used to analyze the research data.
Findings- Descriptive and inferential analysis have both been used in this study. The result of data analysis shows that open innovation has a significant effect on entrepreneurial alertness. It can also be mentioned that the impact of the open innovation mindset on absorptive capacity.
Conclusion- The findings show that the open innovation mindset at the individual level increases the firm's absorptive capacity. Also, entrepreneurial alertness plays a mediating role between the impact of an open innovation mindset and absorptive capacity. The findings thus demonstrate that those who pay attention and have an open and interactive mindset while receiving opportunities and suggestions are more likely to succeed.
Expectations of Students from Classroom Rules: A Scenario Based Bayesian Network Analysis
Authors: DEMİR İbrahim , ŞENER Ersin , KARABOĞA Hasan Aykut , BAŞAL Ahmet
Published: January 2023

Classroom rules are a fundamental aspect of classroom management and ensuring compliance with established rules is crucial. Previous research has shown that students often pay little attention to the development of classroom rules. This quantitative study aims to investigate the expectations that students have concerning classroom rules. To this end, a 4-point Likert scale questionnaire consisting of 30 items was administered to 356 secondary school students. The Bayesian Search method and expert opinion were used to obtain a Bayesian Network model. The findings of the study indicate that students expect rules to be determined at the beginning of the academic year, wish to be involved in the determination process, and prefer minimal changes to the rules. They also expect a limited number of rules and reinforcement from teachers for displaying desirable behavior. Additionally, the study found that students are more likely to adhere to classroom rules in a clean and uncrowded environment, and prefer that their parents are not informed about these rules. The results also suggest that increased adherence to classroom rules leads to increased class inclusion, while decreased adherence results in decreased class inclusion. Furthermore, the study found that adoption of classroom rules leads to increased in-class cohesion, while non-adoption results in decreased cohesion. These findings contribute to the existing body of knowledge concerning student expectations of classroom rules.
Corrigendum: IC50: an unsuitable measure for large-sized prostate cancer spheroids in drug sensitivity evaluation
Authors: Kudic Bakir
Published: January 2023

This corrigendum corrects the authorship information to: Yipeng Xu, Gabriela Pachnikova, He Wang, Yaoyao Wu, Dorothea Przybilla, Zihao Chen, Shaoxing Zhu, Ulrich Keilholz. At the request of Dr. Reinhold Schäfer and with the agreement of all authors, Dr. Reinhold Schäfer is excluded from the list of authors. Dr. Schäfer expresses no doubts about the article's results and conclusion but was erroneously included on the list of authors.

The authors sincerely apologize for the error and confirm that this correction does not change the conclusion of the article.
Prevalence and pattern of psychological disorders among key populations living with HIV/AIDS: findings from ECEWS supported global fund IMPACT project OSS centers in Southern Nigeria
Authors: Okezie Onyedinachi , Raphael Aguanunu , Grace Jimbo , Esther Essien , Andy Eyo , Rebecca Badejo , Ngozi Okeke , George Odutuga , Olufemi Oke
Published: January 2023

Nigeria ranks third among countries with the highest burden of Human Immuno-Deficiency Virus (HIV) infection in the world. The 2019 Nigeria National HIV/AIDS Indicator and Impact Survey showed that 1.9 million people were living with HIV and AIDS in Nigeria as of 2018 [1].
EFFECT OF RECYCLING FIBERS FROM INDIGO DYED YARNS ON YARN PERFORMANCE
Authors: BAYLAK Fehmi , ZERVENT ÜNAL Belkıs
Published: January 2023

Aim: Within the scope of the study, it was aimed to obtain pre-consumer yarn from the fibers obtained by recycling from indigo dyed waste yarns used as warp yarn in denim fabric production and to evaluate the performance of the produced yarns. Method: In the study, the fibers obtained by recycling from indigo dyed yarns were mixed at the rate of 30% in the blend, and the physical properties of the produced yarns were compared with the yarns produced with the original cotton fiber of the same number. Yarns are produced in Z twist direction by ring spinning method. For the study, Ne 7,12/1 ring slub and Ne 9,8/1 ring slub yarns were obtained as rigid yarns, and Ne 10/1 ring carded elastane and Ne 13/1 ring carded elastane yarns were obtained as elastane yarn. The unevenness and strength values of the produced rigid and elastane, original and recycled fiber yarns were tested with standard methods. The yarns' U%, CVm%, 200% neps, 40% thin and 50% thick place values and Rkm values were compared. In addition, since the waste indigo yarns from the mill can be evaluated, the cost input has been analyzed. Results: It was determined that the U% and CVm% values of the yarns containing pre-consumer fiber were 1% higher on average for all yarn counts, and this increase in unevenness with the use of recycled fiber was very low. It has been determined that the yarns produced by the evaluation of indigo yarns are more advantageous in terms of cost. Conclusion: As a result, it has been determined that the fibers obtained by recycling indigo dyed yarns, which are an indispensable part of denim fabric production, can be reused in denim fabric production despite some increase in unevenness and loss of strength.
EVALUATION OF THE STABILITY DESIGN METHODS IN STEEL STRUCTURES
Authors: KUL İsmail , KASAP Hüseyin , YAMAN Zeynep
Published: January 2023

Stability for all building systems; Although it is a problem that must be overcome in terms of life safety and building safety, it has special importance, especially for steel structures. The high strength of the steel provides easy access to sufficient bearing capacity with small cross-sections in the carrier system elements. However, while the buckling problem is encountered in the structural element formed with small sections and subjected to axial pressure load, the stability problem is also met when the holistic behavior of the same structural system is examined. For this reason, it is necessary to carry out the design by examining the stability situation based on elements and throughout the system during the design phase. It would be a correct method to consider the factors affecting the stability of the element and the structure with a comprehensive research in the stability design. In this context, international steel regulations and Turkish Steel Regulations (ÇYTYHE-2016) offer design opportunities with two different methods: General Analysis (GA) and Buckling Length (BB) method. There are two different analysis methods to consider the second-order effects of the design methods. These methods are nonlinear geometric analysis (nonlinear) and approximate second-order analysis methods (YIMA). When the presented methods are blended, they form four different design and analysis methods within certain boundary situations. Aim: This study is aimed to compare the four methods within the limits of applicability and to highlight their advantages and disadvantages. Method: Within the scope of the study, a single-story plane steel frame system and an 8-story steel structure model were designed with first-order analysis and stability controls with four different methods, and the results were analyzed. Result: As a result of the study, in terms of clarity and applicability in the calculations, the GA method is different from the BB method; It has been seen that the Nonlinear analysis method is more reliable than YIMA since it can analyze the deformations more realistically. However, in cases where the use of the superposition principle is necessary, the nonlinear analysis method cannot be applied, so the use of the YAMA method is advantageous.
INVESTIGATION OF THE USABILITY OF GLASS WASTE IN MORTAR PRODUCTION
Authors: ÇELİK Esra , GÜÇLÜER Kadir
Published: January 2023

The Objective: In order to protect the cement preservatives, the energy consumption and its ecological reflections on the world are important for our present and future. For this reason, sustainable building materials production and recycling of wastes in this area can provide advantages. For this purpose, waste glass substituted mortar samples were produced in this study. The Method: The cement and waste glass replacement ratios in the produced test samples were 5%, 10%, and 15% respectively. In order to determine the workability of the fresh mortars, the manual spreading table test was applied. In order to determine the physical properties, water absorption and unit weight tests were applied, and in order to determine the mechanical properties, pressure and bending strength tests were conducted. The Findings: In the compressive strength test, the control sample was found to be 36.23 Mpa, in the sample with 15% waste glass, the average stress value was found to be 22,52 MPa. The flexural strength of the control sample was 8.70 MPa, in the sample with 15% waste glass, the average stress value was found to be 6,37 MPa. Similar results were found for the control sample and waste glass-added samples in the unit volume weight and water absorption tests. The Outcome: Depending on the increase in the waste glass additive ratio in the mortar samples, a decrease in the compressive and flexural strength values was detected. No significant differences were observed in the values measured in the spreading table and the water absorption values compared to the control sample. In the study, it was found that the mortar's physical properties didn't change much when the amount of waste glass was increased.
REDUCING ACTIVE POWER LOSSES WITH OPTIMAL REACTIVE POWER DISPATCH IN 114 BUS NORTHWESTERN ANATOLIAN POWER SYSTEM
Authors: GÜMÜŞ Talha Enes , EMİROĞLU Selçuk , ÇAVUŞ Türker Fedai
Published: January 2023

Aim: In this study, it has been proposed to solve the Optimal Reactive Power Dispatch (ORPD) problem with Genetic Algorithm (GA) in order to minimize the active power losses and voltage fluctuations in the 114 bus Northwestern Anatolian (NWA) power system. Method: The ORPD problem, which is modeled as a nonlinear optimization problem, has been solved by using GA. The ORPD problem has been applied to a large 114 bus power system in Northwestern Anatolia. By solving the ORPD problem, terminal voltages of generators and reactive power values of shunt compensators, which are optimal control variables, have been found. Control variables values to minimize active power losses and voltage fluctuations have been obtained by using GA. Results: The proposed approach has successfully solved the ORPD problem by finding the voltage values of the generators and the sizes of the reactive power sources which are the control variables of the optimization problem. The aim of the ORPD problem is to minimize power losses and to reduce the voltage deviations in the system considering some operational constraints. The proposed approach has been applied to the 114 bus NWA power system and it has been observed that the active power losses are reduced by 4.63% and the bus voltage deviations are decreased from 0.08 to 0.0798 after ORPD. Conclusion: By solving the ORPD problem, active power losses and voltage fluctuations at buses are simultaneously minimized by ensuring that all bus voltages remain within the defined limits in the 114-bus NWA power system. Simulation studies have shown that with the proposed ORPD approach, the bus voltages remain within the specified limits and the active power losses are reduced compared to the first case. The reduction in bus voltage deviations means that the system becomes more stable in terms of stability. Thus, while saving is achieved by increasing the efficiency in the power system, it is also possible to monitor the stability of the system.
INVESTIGATION OF TRADITIONAL AND MODULLAR COLUMN-BEAM CONNECTION WITH FINITE ELEMENT METHOD UNDER DIFFERENT LOADING CONDITIONS
Authors: HAZİNEDAR Sibel , AĞCAKOCA Elif , NASERY Mohammad Manzoor
Published: January 2023

Aim: Damages to buildings as a result of earthquakes in our country and in the world; structural design can consist of concepts such as rigidity and ductility, as well as column-beam junction details. Column-beam connections of structures with a steel frame carrier system can be designed as a rigid connection where the moment is transferred by using bolts or welding connection tools, or as an articulated connection. In the literature and in practice, the column-beam junction detail in the bearing system can be made using two methods called modular and conventional methods. Method: In the study; the behavior of the column-beam connection under the effect of displacement-controlled load of the two-stories frame system constructed using a modular and conventional method was investigated using the Abaqus finite element program. Findings: The load-displacement values obtained from the finite element model, the stress distribution and the yield state in the joint area were compared according to the 100 mm vertical and 100 mm horizontal displacement-controlled loading condition of the bearing system created by using different methods. Conclusion: The developed modular frame system exhibited the strong column-weak beam principle, which is the desired system behavior according to the earthquake resistant building design principle. However, although the frame system created using the traditional method is more rigid and the load bearing capacity is higher than the modular frame system.
IS CHANGE OF DIRECTION ABILITY RELATED TO VERTICAL JUMP PERFORMANCE IN FEMALE SOCCER PLAYERS?
Authors: EGESOY Halit
Published: January 2023

Aim:The purpose of the current study was to investigate the relationship between vertical jump performance and change of direction ability in female soccer players. Method: Nineteen female soccer players (Age=18,20±2,44 years, Height=160,24±3,52 cm, Weight=57,24±6,28 kg, Body mass index=19,46±4,48) from second division team in Turkish Professional Soccer Female League were tested for vertical jump (countermovement jump) and change of direction ability with zig zag test. Relationship between zig zag test and vertical jump were assessed by Spearman’s rho correlation coefficient test. Results: According to study results, there was a low correlation (r =0.62, p < 0.05) between vertical jump and zig zag tests. Conclusion: As a result, it is recommended that high-intensity exercises, especially jumping, change of direction and sprint drills, should be included sufficiently in the training planning so that female football players can demonstrate their optimal performance during the game.
THE RELATIONSHIP BETWEEN: LEISURE PREFERENCES AND PROBLEM SOLVING SKILLS OF UNIVERSITY STUDENTS
Authors: AKAY Buğra , CEYLAN Mehmet , ARSLAN Sibel
Published: January 2023

Aim: This study aims to examine the relationship between leisure time preferences and the problem-solving skills of university students. Method: The research group of the study consists of 739 (451 female and 288 male) university students selected by using the convenience sampling method. A questionnaire form containing 14 items intending to determine the personal information of the students and the types of activities they prefer in their leisure time and the "Problem Solving Inventory" developed by Heppner and Petersen (1982) and adapted to Turkish by Sahin, Sahin, and Heppner (1993) were used in the study. The Pearson correlation, t-Test, ANOVA method was used for data analysis. Findings: Most preferred activities by university students in their leisure time were "listening to music and using social media" and the least preferred ones were "going to hobby courses and doing handiwork/handicrafts." A low positive significant relationship was found between the mean scores of "doing physical activity", "going to hobby courses", "doing handiwork/handicrafts", "participating in educational activities", "reading books", and "spending time with friends/family" preferred by the students in their leisure time and their problem-solving skills. It was also observed that there was a negative, although not significant, relationship between the activities of watching television and playing video games and problem-solving skills. Conclusion: It can be concluded that students' leisure time preferences requiring active participation such as doing physical activity, going to hobby courses, doing handicrafts, reading books, and spending time with family have positive contributions to their problem-solving skills while passive activity types such as watching television and playing video games have a negative effect on these skills.
Yeast Peptone Dextrose (YPD) medium v1
Authors: Sagen Andreas
Published: January 2023

Yeast peptone dextrose is a medium composition used to grow many common yeasts, among others Saccharomyces cerevisiae. Glucose is the primary carbon and energy source, while nitrogen and essential amino acids are provided by the yeast extract and peptone. It is nonselective and the addition of protein and yeast extract allows faster growth so that during exponential or log-phase growth, the cells divide every 90 minutes in S. cerevisiae.
Assessment of Governance and Ecological Status of Terengganu Marine Park, Malaysia: Toward Marine Spatial Planning
Authors: Che Din Mohd Safuan , Aziz Nazli , Md Repin Izarenah , Xue Xiong-Zhi , Abdul Rahman Muhammad Ashraf , Bachok Zainudin , Nik Omar Nik Nurhazirah , Abd Rasid Nor Hafzan , Wan Talaat Wan Izatul Asma
Published: January 2023

Terengganu Marine Parks (TMP) is a 591.37 km2 marine protected area. TMP are popular tourist destinations that significantly generate revenue to the government and local businesses through tourism sector. However, the anthropogenic activities have contributed to TMP’s declining ecosystem health, particularly the coral reefs. Therefore, a sustainable ecosystem-based management is required to maintain the ecosystem. In this study, we identify issues related to the marine park’s governance, development on islands, tourist activities and coral health status in the TMP for assessing potential management strategy for conserving the ecosystem. The findings on management in TMP found that there is an overlapping in managing the marine park between the federal and state government. Unintegrated development to accommodate rising number of tourist and their activities in the marine parks are identified as the factors contributing towards degradation of the ecosystems. Relatively, reef areas close to these local pressures are in ‘poor’ condition, indicating that threats arising from the activities affecting the marine ecosystem. Hence, this study analyses the potentials in adopting Marine Spatial Planning (MSP) in the TMP for managing the conflict between user and the ecosystem. The Australian Great Barrier Reef Marine Park which applied the zoning of marine area is used as a benchmark to examine the best practices of MSP to govern the TMP. At present, we suggest using coral reef health status as an early alternative and best practice to provide different zoning criteria for strategic marine protected area (MPA) management for TMP.
A Study on Antibacterial, Antioxidant, and Hepatoprotective Efficacy of Elephantopus scaber L.
Authors: Nguyen Trong Hong Phuc , Phan Thanh Dat
Published: January 2023

Elephantopus scaber is an herb widely used in folk remedies in Vietnam, especially in the treatment of liver disease. However, scientific studies evaluating the activity and ability to treat the disease in a scientific way are still very limited. This study evaluated the antibacterial, antioxidant, acute toxicity and hepatoprotective efficacy of E. scaber extracts. The extracts restricted the growth of 6 types of bacteria, being particularly most effective against E. coli. It was found that the E. scaber leaves extract was more efficient than root, stem, flower, and whole plant extracts. DPPH assay showed that the flower extract had the highest antioxidant activity (EC50 = 60.29 µg/mL). The E. scaber extracts (>5000 mg/kg) also did not cause acute toxicity in mice. Additionally, the extracts effectively protected and recovered mice liver cells damaged by CCl4. The reduction of mice liver enzyme levels (AST and ALT) was similar between the extracts and silymarin. This hepatoprotective efficiency was also illustrated by the morphology and histology of the mice liver cells. The extracts healed mice liver cells by recovering the cell diameter, reducing inflammation swelling and increasing Hb concentration.