bluuebunny/crossref_metadata_2025 huggingface dataset:
Minimization of dynamic changes in the tension of long products behind the outlet cage in rolling stock production in coils
Authors: Boyko O , Kuvaiev V , Beshta D , Potap O , Matsiuk S
Published: December 2022

Purpose. Justification of technical solutions as to the reduction of the amplitude and reduction of the dynamic change duration in the tension of the rolling stock at the exit of the output cage when moving to winding a new layer to an acceptable level in terms of its effect on the resulting profile of the rolled product through the control of the rotation frequency of an output cage. Methodology. The conducted research was based on a complex model of the process of rolled steel winding with a Garrett-type winder and the tension of rolled steel in the area of the exit cage-winder. To control the actual amount of tension at the output cage exit, it is suggested to use the amount of free deflection of the rolled steel directly behind the cage. The research was carried out by simulating the process of rolled steel winding according to the basic control scheme and control schemes that predict the influence on both drives, i.e. the winder drive and the output cage drive according to the actual value of tension, in various combinations with further analysis and comparison of the obtained results. Findings. It was established that the correction for the deviation of the actual rolling tension in the finishing cage-winder area from the specified value of the winding current of the winder electric drive does not eliminate rolling tension when switching to the next layer winding and the oscillating form of the transition process, which are characteristic of the basic rolling winding scheme. In turn, the correction of the rotation frequency of the output cage rolls drive reduces the amplitude of the roll tension jerk by almost half with a simultaneous reduction in the time of the transition process and readjustment when switching to a new layer winding. Originality. It has been shown for the first time that the introduction of the roll tension control circuit by correcting the high-speed rolling mode of the output cage ensures minimization of dynamic changes in the rolled steel tension when switching to a new layer winding and reduces the probability of local tightening of rolled steel profile. Practical value. The use of the described technical solutions in the control system of the section of rolled products winding of the small-grade wire mill DSDS 250/150-6 PJSC ArcelorMittal Kryvyi Rih ensures the improvement of the commercial properties of the winding of rolled products produced on the rolling mill.
Impact of digital maturity on sustainable development effects in energy sector in the condition of Industry 4.0
Authors: Polyanska A , Savchuk S , Dudek M , Sala D , Pazynich Yu , Cicho D
Published: December 2022

Purpose. To study the impact of digital maturity of energy enterprises on achieving the effects of sustainable development in the conditions of the fourth industrial revolution. Methodology. The study on energy enterprises economic efficiency was based on the results of a statistical analysis of their activity economic indicators and a macroeconomic analysis of the prerequisites for the digitalization of Ukrainian energy companies, as well as considering the results of an analytical study of foreign companies digital transformation. The application of the benchmarking method made it possible to highlight the best examples of digital changes of energy companies in the field of sustainable development. The generalization method made it possible to point out the effects of digitization of sustainable development for energy companies. Findings. Effectiveness of energy enterprises due to the implementation of digital transformation is reasoned, which allows achieving the effect of sustainable development by ensuring environmental, economic, and social development. Based on the calculation of economic efficiency values, the most efficient energy enterprise was determined, whose activity is characterized by the highest level of digital transformations aimed at achieving the goals of sustainable development. Originality. The dependence between the level of digital maturity of energy enterprises and their economic efficiency is substantiated. The spheres of energy enterprises activity have been established, whose efficiency and importance increases with the level of digitalization. The technical characteristics of energy enterprises digitalization in the spheres of implementation of sustainable development goals, namely economic, social, and environmental ones, are highlighted. Practical value. The main directions of energy enterprises activity have been determined based on the selection of the effects of sustainable development, which are achieved thanks to digitalization. The efficiency of the enterprise because of digitalization is substantiated, considering the directions of sustainable development.
Improvement of the safe work system
Authors: Tsopa V. A , Cheberiachko S. I , Yavorska O. O , Deryugin O. V , Aleksieiev A. A
Published: December 2022

Purpose. To improve the approach to the development of a safe work system, one of the important elements of the occupational health and safety management system (OHSMS) of employees at an enterprise. Methodology. The research is based on the Safe Systems of Work, which combines the content of safe procedures, which are determined taking into account the content of the workers production task when performing production activities, his/her competence in understanding the technological process and characteristics involved technological equipment. Findings. To reduce occupational diseases and industrial injuries at enterprises, it is proposed to implement the Safe Systems of Work (SSW) of 5 steps: analyse, summarize, anticipate, support, improve, which will make it possible to identify occupational risks (OR) and justify the feasibility of reducing their impact on the worker during the performance of production activities. For the implementation of each step, a corresponding procedure is provided, which allows ensuring their implementation. It is proposed to carry out the OR evaluation procedure according to the Tree Trunk Analysis model, which is a section of the trunk of a tree divided into six parts which characterize the dangerous factors that affect the activity of the employee, the functioning of the technological equipment and the environment. A feature of the proposed approach is the establishment of zones of interaction between the following components of the proposed SSW: the worker and technological equipment, the worker and the environment, as well as the environment and technological equipment, which characterize the specified external and internal factors of influence on the SSW. Originality. The approach to the organization of SSW to reduce the level of OR during the performance of production activities has been improved based on the improvement of the OR management process, the identification of external and internal dangerous factors that affect the level of OR, the probability of the occurrence of a dangerous event and its degree of severity, taking into account changes, over time, in the conditions of performing professional activities: during stable work, during an emergency situation, during an accident and during martial law. Practical value. Improved labour protection instructions or maps of safe production processes can be applied at enterprises with the aim of better perception by employees of labour safety requirements and improvement of document flow at the workplace.
Heavy metals removal using natural zeolite adsorption from Tigris river water at Samarra city (Iraq)
Authors: Al-Hilali B. M. I , Hameed L. A , Theyab M. A , Balci B , Rajab M. M , Mohammed S. S , Fadel S. A
Published: December 2022

Purpose. The current study was conducted to evaluate the heavy metals adsorption and sorption rate when removing them from water and processing it in the Tigris River in Samarra city, Salah El-deen, Iraq in 20212022 and evaluate the efficiency of zeolite for removing heavy metals, as well as to determine the high and low adsorption percentage from all heavy metals found in the river. Methodology. The study included the analysis and measurement of physical and chemical properties with low-cost natural processing with no side effects to reduce the heavy metal in the Tigris River. Finding. The results of the present study showed that the conductivity and turbidity of water decreased from 1596 to 727 c/cm, from 343 to 22 naphthalene unit (NTU), respectively, and turbidity decreased from 633 to 491 ml/L. The concentrations of biological dissolved oxygen, total suspended solid, and total dissolved solid increased, while those of preprocessing nitrates (12.2mg/l) differed significantly from the results of post processing (52 mg/l). Repetitive measurements showed good results for heavy metals such as Cr3+, Cd2+, Cu2+, Pb2+, Zn2+, Ni2+ and Co2+ with 16.3, 23.1, 6.3, 14.4, 8.1, 12.5 and 17.4 mg/l, respectively; the adsorption percentage was 81.6, 81.5, 86.7, 87.3, 76.4, 89.5 and 79.7%, respectively. Originality. The work showed the efficient processing of sewage water when treated with zeolite rocks powder being low cost and easy to use to adsorb heavy metals from water. Practical value. Zeolite as a powder ground in different sizes could be used as a layer in the filter that purifies the water to become a drinking water with low heavy metal concentrations as well as with some other factors.
Study on accumulation of heavy metals by green plantations in the conditions of industrial cities
Authors: Lovynska V. M , Sytnyk S. A , Holoborodko K. K , Ivanko I. A , Buchavyi Yu. V , Alekseeva A. A
Published: December 2022

Purpose. Determination of the relationships between the concentrations of Zn, Cu, Pb, Cd in the atmospheric air and in the assimilative organs of the false acacia (Robinia pseudoacacia) trees the most common species in the system of landscaping of industrial cities. The objectives of the study included finding out the peculiarities of the spatial distribution of metal pollutants in green spaces of Robinia pseudoacacia in Dnipro city. Methodology. The study was conducted in the system of green spaces of the industrial city of Dnipro, in the atmospheric air of which pollutants dominate, whose source is emissions from metallurgy, energy and motor transport. To carry out the experiment, the method of atomic absorption spectrophotometry was used to determine the concentrations of heavy metals. The trend of technogenic emissions into the atmosphere was estimated by statistical methods. The spatial distribution of accumulation of essential and toxic metals in the Robinia plantations of the industrial city was built on the basis of the obtained experimental data. Findings. Among the studied pollutants, the maximum concentration in the assimilation organs was found for Zn, whose range was 1530 mgkg-1. Almost the same level of accumulation was reached for Cu and for Pb: 3.917.2 and 8.610.8 mgkg-1, respectively. The presence of Cd, which is not an essential element, has been established, which allows considering Robinia plantations as a potential depositor of Cu and Cd in conditions of polyelemental pollution of industrial cities. Originality. It was established that Robinia plantations as an element of the green infrastructure of industrial cities are characterized by the maximum effect of Cu (among other heavy metals) translocation and are effective potential depositors of Pb when its normative values in the atmospheric air are exceeded.. Practical value. On the basis of the obtained experimental data, the spatial distribution of accumulation of metals as pollutants in Robinia plantations was constructed, which can be considered in the plane of optimization of the state of atmospheric air in the city. The cartographic materials that can be used by the subjects of environmental monitoring and green construction of industrial cities were obtained.
Computer modeling of territory flooding in the event of an emergency at Seredniodniprovska Hydroelectric Power Plant
Authors: Ivanov D. V , Hnatushenko V. V , Kashtan V. Yu , Garkusha I. M
Published: December 2022

Purpose. Computer modeling of territory flooding in the event of an emergency at Seredniodniprovska Hydroelectric Power Plant (HPP). Methodology. The computer model of possible territory flooding at Seredniodniprovska HPP is developed using simulation modeling methods and geometric and hydrological approaches and considers initial boundary conditions of the water-engineering system. Calculations of the wave break height and the half-divided cross-sectional area of the river bed were made and a three-dimensional model of the territory flooding was built using the Python language and ArcGIS Desktop software. Findings. The data for each creation of the hydraulic node, namely the depth and width of the flooded territory, were calculated. This allowed analyzing the macro level considering the triangulation model of the surface. The wave break parameters and flaps (intersections) were taken into account in case of a dam break at a hydroelectric power plant or a rise in the water level. Amathematical model, and a 3D model were developed, and a forecast of the flood zone due to an emergency was made using satellite survey data. Originality. The mathematical method received further development for calculating flood territories in the event of an emergency at Seredniodniprovska Hydroelectric Power Plant, taking into account the parameters of the breakthrough wave and the calculation of cross-sections for the cases when a hydroelectric dam breaks or the water level rises; the method uses one-dimensional and two-dimensional systems of Saint-Venant equations, and geometric and hydrological approaches. A three-dimensional model of the territory flooding is developed to predict possible consequences. Practical value. The obtained results can be used to model the flooding of the territory located near dangerous hydro-technical objects, such as dams, dikes as well as to forecast flooded territories during the construction of drainage and protective structures.
Improving transport logistics of extractive industry products in the context of capacity constraints on the railways
Authors: Aldanazarov K , Toktamyssova A , Karsybayev Y , Korobiova R , Kozachenko D
Published: December 2022

Purpose. To improve the distribution methods of freight flows on the railway network under conditions of capacity constraints. Methodology. Methods of railway operation theory and operations research were used. The problem of cargo flow distribution on the railway network was solved as a multi-product (interchangeable cargoes) transport linear programming problem with capacity constraints in the network form. The average cost of freight transportation is established by the methods of probability theory. Findings. In the course of the research the methods of cargo traffic calculation on the railway network are improved. The proposed approach to the formalisation of the task makes it possible to take into account the presence of different cargoes to be transported, capacity constraints of some railway network sections, as well as non-linear nature of dependence between the volume and cost of transportation. To meet the requirement of consignors equal access to public carrier services, the method for calculating the cost of transportation for an individual consignor is improved. Originality. Scientific novelty of the paper consists in improvement of methods of cargo traffic distribution on the railway network and tariffing of cargo transportation services in conditions of restricted supply capacity of separate sections. Practical value. The extractive industries have a steady flow of goods. The main logistic tasks in this case are to ensure transportation of the given volume of cargo and reduce the cost of transport services. Using the proposed mathematical methods of optimization allows you to get higher-quality solutions compared to the method of technical-economic comparison of options, which provides an overall cost reduction for cargo transportation. The improved method of tariffication of transportation can reasonably allocate the savings from reducing the cost of transportation among cargo consignors and thus reduce their logistics costs.
Digital technologies and their impact on economic and social spheres in Ukraine
Authors: Silakova H , Solomka O , Bila I , Koliadych O , Sanduhei V
Published: December 2022

Purpose. To determine the specifics of the impact of IT use on the economic and social spheres in Ukraine. To develop a mathematical model for evaluating and forecasting the impact of IT on these areas. Methodology. General and special methods of cognition were used in the research: mathematical formalization for evaluating and forecasting the impact of IT on the economic and social spheres, correlation analysis to establish multiplicative relationships of parameters and basic functions; comparison to establish the nature of the IT impact on the social and economic spheres; analogies to analyze the level of IT development in Ukraine and other countries; quantitative and qualitative comparison to analyze the level of social Information and Communications Technologies (ICT) use at enterprises by types of economic activity. Findings. It is proved that there are limiting factors to the growth of the positive IT impact, in particular the average level of income per capita. This is also evidenced by the comparison of agricultural and industrial regions of Ukraine, which indicated a significant gap in the introduction of IT in the countryside and the city. The weaknesses and successes of Ukraine in the implementation of IT are identified. The causes of hampering the positive impact of IT use on the development of social and economic spheres are indicated. A significant level of differentiation in the use of IT by business by types of technologies was proven. Originality. The peculiarities of the IT impact on the economic and social spheres in Ukraine are determined. The main feature is balancing between the development of IT technologies and social sphere and the state of stagnation of this process. A mathematical model for evaluating and forecasting the IT impact on the economic and social spheres has been developed; the intermediate results of its use have been given. Practical value. Recommendations for removing obstacles to the implementation of IT in Ukrainian social and economic spheres have been proposed.
The impact of the economic and COVID-19 crises on the Visegrad Group countries
Authors: Michov M , Megyesiova S
Published: December 2022

Purpose. To analyze the development of individual economic indicators, that are key aspects in evaluating the economy of countries in the context of international comparison and competitiveness. Through year-on-year changes, to monitor the development of indicators such as gross value added, total employment and hours worked in the last two crisis periods. To compare the impact of the economic and COVID-19 crises on the mentioned economic indicators and labor productivity in the Visegrad Group countries. Methodology. Several scientific methods suitable for the detection of the impact of crises were used in the article. In particular, elementary time series analysis and index numbers were calculated to detect the most important development trends of selected indicators. Chain indexes and fixed base indexes were figured for the gross value added, employment, number of hours worked, labor productivity per person employed and labor productivity per hour worked. Within the indicators it was searched for the impact of economic and COVID-19 crises. Findings. Analysis of labor productivity and its development in crisis periods, as well as analysis of development of individual indicators from which the productivity was calculated was the key issue of the study. Despite the assumptions of some authors that the pandemic crisis will have a more significant impact on the change of countries economies than the global economic crisis, the study did not support this assumption. The year-on-year changes of the indicator in time of both crises were approximately the same, in some cases we recorded a higher year-on-year decrease in indicators due to the economic crisis and not due to the COVID crisis. Originality. The development of selected indicators including two types of labor productivity within the global economic crisis and the pandemic crisis COVID-19 was subjected to analysis among Visegrad Group countries. Practical value. The analysis of economic indicators carried out on a country-by-country basis can later be used as a support in a deeper analysis of individual indicators and productivity, either within regions of countries or individual sections of national economies, in examining the impact of economic and COVID-19 crises.
Legal management and regulation of the activities of professional participants in the stock market of Ukraine
Authors: Blikhar M. M , Shevchenko N. V , Komarnytska I. I , Zaiats O. S
Published: December 2022

Purpose. To assess the effectiveness of legal management and regulation of professional participants based on the analysis of legislative, regulatory and legal documents that ensure the formation, regulation and prevention of illegal actions in the domestic stock market, as well as identify areas of cooperation with government agencies in stock market development and mediation. Methodology. In the process of research, general research methods and techniques were used, in particular: analysis and generalization to identify regulations governing the activities of professional stock market participants; analytical method to compare the effectiveness of cooperation of the National Securities and Stock Market Commission with anti-corruption organizations, synthesis to assess the completeness and effectiveness of existing legislation governing the activities of professional participants. Findings. The peculiarity of legal management and regulation of professional participants is determined; the classification mark of professional stock market participants and their activities (types of services) is formed in accordance with the National Commission on Securities and Stock Market, namely: investment firms, trade organizers (stock exchanges), clearing institutions, mortgage managers, depository institutions, companies with asset management. An analysis is performed of the effectiveness of certain laws, including the Law of Ukraine On Prevention and Counteraction to Legalization (Laundering) of Proceeds from Crime, Terrorist Financing and Financing the Proliferation of Weapons of Mass Destruction, which reduced corruption and sanctions during 20172020 and the Law of Ukraine On licensing of economic activities, which is a lever in the field of regulation and maintenance of transparency of professional market participants, prevention of illegal actions. The mechanism of cooperation of professional participants with state bodies as a component of legal management on the basis of SMIDA activity is developed. Originality. It consists in defining the areas of legal management and regulation related to the activities of professional participants in the stock market and developing mechanisms for interaction of professional participants with government agencies based on transparency, information and competitiveness. Practical value. The proposed directions of cooperation and interaction of professional participants with government agencies, in particular SMIDA and NSSMC, as part of legal management and legal support, will optimize the standards of exchange activity and development of stock trading, reduce corruption and shadowing.
The impact of internationalization to improve and ensure quality education: a case study of Daffodil International University (Bangladesh)
Authors: Shayery A. J , Zayed N. M , Islam K. M. A , Hossain M. F , Nitsenko V. S , Imran M. A
Published: December 2022

Purpose. Ensuring standard education through internationalization since it is a big concern in academic institutions all over the globe. The goal is to equip and introduce students and educators to the worlds innovations through globalization at the tertiary level of education and improve & ensure quality education for students and upgrade educators quality. Methodology. An evaluative and expository study is conducted on Daffodil International University (DIU), regarding its mission and vision toward internationalization, its collaborations, initiatives, condition of the education quality, and analysis of the mobility data in the last few years. A quantitative overview and analysis of the key performance indicators of the internationalization of DIU are applied. This study is on understanding the IoHE in the Bangladeshi context, based on experience, analysis of student/faculty mobility, and national reports from different regions. Participation in European programs or other supranational programs in education, research and capacity building, and partnerships is indicated. Findings. This study presented the effectiveness of the Internationalization of Higher Education (IoHE) considering the growth of developed countries in respect of ensuring quality education. This research established that Bangladesh is not far behind to cope with or follow the international trend, and some Bangladeshi universities are already involved with mobility programs for their undergraduate-level students, especially DIU, Bangladesh. It resulted in finding that internationalization through mobility programs facilitates the branding and reputation of HEIs as well. Originality. In comparison to the traditional education system, the approach used in the research showed that the academic staff gets acquainted with modern teaching techniques, international standard course contents/syllabus including OBTL, and research methodologies for innovation reinforced their educational and research potential, which be proven to be important components of the overall development of students and academics, giving them awareness and helping them adopt alternative, multi-faceted approaches to teaching-learning. Practical value. The result of the research can be institutionalized by policymakers, educators, and academics to create an impact on the students and to develop institutional value in the global market. Given strategies and innovative ideas can play a vital role in enhancing the quality of higher education, facilitating scholars, and improving the quality of research in various fields.
Identification of determinants of corruption in government: a mar-spline approach
Authors: Bozhenko V. V , Lyeonov S. V , Polishchuk Ev. A , Boyko A. O , Artyukhova N. O
Published: December 2022

Purpose.Development of a scientific and methodological approach to the identification of the most impactful determinants on corruption using multivariate adaptive regression splines. Methodology. Methodological tools of the research methods are comparison, grouping, bibliometric analysis, and multivariate adaptive regression splines in the form of piecewise linear functions. Findings. Systematization of the literary sources and approaches for factors influencing corruption indicates that most empirical studies are based on using panel data. Panel data allows you to insert general patterns, but does not consider the patterns of the national economy. For the study on corruption in Ukraine, 15 influencing factors were selected, characterizing the institutional, economic and social environment. Based on the constructed MAR Spline models, three regression equations were obtained that describe the linear dependence of the level of corruption in governance on the selected factors. The paper found that the relevant factors influencing corruption in Ukraine are: tax burden, general government final consumption expenditure, average monthly wage in Governance and rule of law. Originality.The proposed approach makes it possible to determine the dynamics of the degree of factor influence on the level of corruption in the country. The paper defines the threshold values of statistically significant indicators at which the maximum degree of correlation with the corruption perception index is achieved. Practical value.The regularities between the level of corruption and economic, institutional and social factors revealed by the research results can be used in the development of tools to fight corruption in Ukraine. The formation of an effective anti-corruption system will strengthen financial stability in the country and increase the level of public trust in society.
Innovative intellectual capital in the system of factors of technical and technological development
Authors: Pylypenko Yu , Prokhorova V , Halkiv L , Koleshchuk O , Dubiei Yu
Published: December 2022

Purpose. To define the essence and structure of the innovative intellectual capital and substantiate the quantitative indicators for its measurement. Methodology. During the research, the following general scientific methods of scientific knowledge were applied: system analysis to clarify the essence of innovative intellectual capital and its structure; a method of analysis and synthesis to substantiate the components of the innovative intellectual capital index; economic and mathematical methods to calculate the index value for certain countries of the world. Findings. The essence of innovative intellectual capital is analyzed as a set of intangible assets of the country, which characterize the real and potential ability of human capital to use knowledge and information for innovative economic growth. Its three structural elements human, structural, and network social capitals are identified and characterized. A method of quantitative measurement of innovative intellectual capital is substantiated by representing the same-name index. The value of the innovative intellectual capital indices is calculated in terms of sampling of 26 world countries; its dynamics over three years is shown, and direct relationship between its level and the GDP indicator of the respective country is proven. Originality. The essence of innovative intellectual capital and its structure is substantiated; the index of innovative intellectual capital is proposed, and its value is calculated for the selected world countries; the direct dependence between its level and the GDP indicator of the respective country is proved. Practical value. The proposed index of innovative intellectual capital makes it possible to select more effectively the directions of the national economic policy in the field of technical and technological development.
Detection of Epileptic Seizures from EEG Signals Using Machine Learning Classifiers
Authors: Joy Avijit Dey , Sarkar Sraboni , Azad Abul Kalam
Published: December 2022

Epileptic seizure is a chronic neurological disorder which affects millions of people all over the globe. It can be treated in a better way if the symptoms are detected at an early stage. In this study, we have demonstrated and evaluated the classification performances of different machine learning classifiers for the detection of epileptic seizures from electroencephalography (EEG) signals. For this, we have first applied principal component analysis (PCA) on EEG signals to obtain much reduced-length PCA vectors. These vectors are then applied to decision tree (DT), k-nearest neighbor (KNN), Naïve Bayes (NB), support vector machine (SVM) and artificial neural network (ANN) classifiers for the detection of epileptic seizures. The effects of length of PCA vectors on the performances of these classifiers have also been analyzed rigorously for 2-class, 3-class and 5-class classification of EEG signals. Besides such PCA-based classifiers, we have also proposed and evaluated the performances of a customized convolutional neural network (CNN) to directly extract features from the EEG signals as well as to perform classification tasks. The results showed that CNN outperforms PCA-based machine learning classifiers. For 2-class classification cases, CNN attains classification accuracies in the range from 99.50% to 100%, whereas 98.48% and 96.32% accuracies are obtained with CNN for 3-class and 5-class classification cases. The results signify that the proposed CNN classifier can be considered as a highly-efficient scheme for the reliable detection of epileptic seizures from EEG signals.

Bangladesh Journal of Medical Physics Vol.15 No.1 2022 P 28-42
Improving Deep Sensitivity of Four-Electrode Focused Impedance Method In Lungs by Varying Electrode Geometries
Authors: Mobarak Mahjabin , Rabbani K Siddique e
Published: December 2022

Bio-Electrical impedance is of special interest in the detection and diagnosis of lung problems, particularly in the low and medium income countries. An age old simple technique employing four electrodes is known as ‘Tetra Polar Impedance Measurement (TPIM)’ but it cannot localize a particular zone of interest region. A new technique named as ‘Focused Impedance Method (FIM)’ was innovated by a Dhaka University group which gives high sensitivity in a localized zone of interest. Previously FIM was used from one side of the thorax which gave a rather limited information from the lungs, from shallow depths only. In order to get information from deeper regions of the lungs a new configuration of electrodes for FIM was proposed by the same group at Dhaka University which placed two electrodes at the front and two electrodes at the back of the thorax in a horizontal plane. It is expected that the degree of depth sensitivity would depend on electrode separation on both the sides. The electrode width may also have an effect. In order to study these quantitatively, COMSOL Multiphysics software was used to simulate the measurements in a rounded rectangular volume to represent a typical thorax, which was filled with isotonic saline. Electrode separations of 5cm, 10cm, 15cm and 20cm were studied while electrode widths studied were 0.15cm, 1cm and 3cm. The work supported the proposed new configuration of electrodes for FIM in that this method gives enhanced sensitivity throughout the depths of a lung and that for a thorax with a cross section of 33cm26cm, an electrode separation between 10cm and 15cm would give optimum results. For electrode width, the ones studied did not give any significant difference, however, the smallest (0.15cm) one appeared to give slightly better results.

Bangladesh Journal of Medical Physics Vol.15 No.1 2022 P 43-54
Numerical study of unsteady flow past compound cylinders
Authors: Mosallem Mohammed M , Hadidi Haitham M , Tharwan Mohammed Y , Ahmed Zeinab A
Published: December 2022

The flow over compound cylinders is simulated using computational fluid dynamic (CFD). Three contacting cylinders of different diameters, arranged in tandem with respect to the oncoming flow were examined at Reynolds number ReD = 333 based on the diameter of the middle cylinder, D. The proposed configuration simulates the wind flow over the satellite launch vehicles during the period of launch. Computations were performed for diameter-to-diameter ratio, d / D, of 0.8 and 0.6. The numerical results revealed the vortex formation and vortex shedding mechanism in the wake downstream of the cylinders. For d / D = 0.6, the near wake is wider than that of d / D = 0.8. It is also found that the base pressure coefficient values for d / D = 0.6 are lower than those for d / D = 0.8. These findings imply that the acting drag force on the cylinders for d / D = 0.6 is larger than that for d / D = 0.8. Concluding that, the base pressure coefficient depends on the diameter ratio d / D whereas, the computed vortex-shedding Strouhal number value was found to be 0.25 and is independent on the d / D ratio.
Bangladesh J. Sci. Ind. Res. 57(4), 215-220, 2022
Manufacturing system optimization using computer-based control kanban loops
Authors: Ezema Chukwuedozie N , Nwobodo-Nzeribe Nnenna Harmony , Eneh Joy Nnenna , Ogbuefi Uche C , Mbunwe Muncho Josephine , Anyaka Boniface Onyemaechi , Ngene John Ndubisi
Published: December 2022

The study assessed manufacturing system optimization using computer-based control kanban loops. The study assessed JIT's effect on average throughput-time, demand fill rate, net operating income for a certain product mix complexity and manufacturing overhead level. ARENA/SIMAN and WITNESS simulation tools were used to study implementation. The Drug Process Plant's JIT system reduced end buffer inventory, shortened customer lead time, and improved visual control. The mean response of the simulated new physical system in terms of NOI was 85.54 but gave a mean response of 85.30 when implemented on the shop floor. The mean response of the simulated new physical system in terms of cycle time was 617 but gave a mean response of 634 when implemented on the shop floor. Simulated new physical system in terms of DFR gave a mean response of 93.11 when implemented on the shop floor. Overwhelmingly, the new JIT system outperformed the old physical system.
Bangladesh J. Sci. Ind. Res. 57(4), 221-228, 2022
Antioxidant, thrombolytic, cytotoxic and antibacterial activities of leaves of Vitex peduncularis
Authors: Islam MS , Al Mansur MA , Rakhi SA , Sarkar MR , Kuddus MR , Ahmed Firoj
Published: December 2022

Vitex peduncularis (Verbenaceae), a perennial tree, is locally utilized for possessing multifaceted pharmacological properties including analgesic, antimalarial, anti-angina, antidiabetic, antioxidant, anti-inflammatory and hepatoprotective. Hence, this study aims to evaluate their antioxidant, thrombolytic, cytotoxic and antibacterial activities from the methanolic crude extract and its various solvent fractions. Data from antioxidant and thrombolytic assay displayed that Kupchan partitioned chloroform soluble fraction revealed the maximum phenolic content (73.39 mg of GAE/g of extract), DPPH free radical scavenging activity (26.69 μg/ml) and thrombolytic activity (37.35%). In brine shrimp lethality evaluation, the LC50 values indicate that the most cytotoxic compound was found to be from ethyl acetate soluble fraction (LC50 6.73 μg/ml). Finally, antibacterial activity of different fractions showed that both chloroform and methanolic fraction possessed mild activity against the tested bacteria. The potential biological effects of the crude fractions have been demonstrated demanding future studies of the isolated compounds to assess these activities.
Bangladesh J. Sci. Ind. Res. 57(4), 239-246, 2022
Quality assessment of shoe lining leather collected from a few footwear factories
Authors: Mahmud Y , Razzaq MA
Published: December 2022

Shoe lining leather that remains under the upper material deserves a comparative evaluation to bring positive outcomes and finding out best possible practice in terms of quality, comfort and other relevant properties for shoe manufactured in different regions. Focusing on this point, a study were performed where lining leathers made of goat skins were collected from a number of footwear factories situated at different parts of Dhaka city and its suburb. To examine the collected lining leathers their physical and chemical properites were studied. Physical evaluation parameters were flexing endurance, tensile strength, stich tear strenth, water vapor permeability shrinkage temperature, color fastness and perspiration fastness. Chemical evaluation parameters were limited to determination of chromic oxide content, fat content and total sulphated ash content. Finally, a compartive study chart has been depicted based on the assessed qualities of collected samples.
Bangladesh J. Sci. Ind. Res. 57(4), 207-214, 2022
Quantification of components of textile fabrics by using chemometric techniques with FT-NIR spectroscopic data
Authors: Uddin MN , Ray SK , Islam MS , Karim MM , Jahan MS
Published: December 2022

The study has attempted to develop chemometric modeling based method to quantify compositions of textile fabrics by FT-NIR spectroscopic data. Three calibration techniques such as: Principal Component Regression (PCR), Partial Least Square Regression (PLSR) and Artificial Neural Network (ANN) were assessed, and PLSR showed the best result. Several pretreatment techniques of spectral data have been evaluated, and Multiplicative Scatter Correction (MSC) performed the best. Results also shows that performance of PLSR was satisfactory for quantification of cotton (R2 ≈0.99), elastine (R2 ≈0.97) and polyester (R2≈0.94) when FT-NIR spectral data were pretreated with MSC. But for quantification of viscose in mixture fabric, efficiency of developed model was not upto the mark (R2≈0.75). Finally, the developed PLSR model with FT-NIR spectroscopic data pretreated with MSC could be used for quantification of cotton, elastine and polyester in textile fabrics rapidly and with comparatively low cost.
Bangladesh J. Sci. Ind. Res. 57(4), 229-238, 2022
Perceptiva de los clientes de entidades bancarias: un análisis sobre los servicios de banca móvil en Tungurahua
Authors: Núñez-Cruz Douglas , Tite-Quispe Cinthya , Sigüenza-Espín Mario
Published: December 2022

El estudio se ha centrado en la banca móvil, puesto que, son conceptos que están en constante crecimiento dentro de los bancos y su utilización a través de teléfonos móviles permitirá alcanzar a un conjunto más amplio de clientes. El objetivo del trabajo fue determinar el impacto que tienen los clientes de las entidades bancarias sobre los servicios de banca móvil en la provincia de Tungurahua. Los factores analizados fueron la satisfacción y la confianza como antecedentes para el desarrollo de la lealtad de los clientes según el método cuantitativo de nivel correlacional. Los resultados demostraron que la satisfacción está sustentada de las interacciones previas, y ello genera un efecto positivo en la lealtad del cliente. También, la usabilidad y el servicio de la interfaz móvil demuestran que generan un efecto positivo en la satisfacción. Se concluye que, los bancos deben priorizar una interfaz fácil de usar y brindar servicios valorados por los clientes de la banca móvil. Si bien es cierto, la competitividad obliga a estas instituciones financieras a ofrecer calidad y experiencias agradables a los clientes.
Ética en los negocios y responsabilidad social empresarial: un análisis de gestión administrativa del sector comercial
Authors: Santana-Rojas Fernando , Ortíz-Sánchez Verónica , Santamaría-Díaz Edwin
Published: December 2022

Los contingentes problemáticos han estado relacionados con la ética empresarial, la responsabilidad social empresarial, el marketing verde percibido, la lealtad a la marca, y se ha relacionado con la explotación del medio ambiente provocado por las tecnologías, lo cual ha afectado a la sociedad. El objetivo de estudio fue determinar la influencia de la ética empresarial en la responsabilidad social empresarial y su percepción en la lealtad del consumidor de Tungurahua. El método aplicado tuvo un enfoque cuantitativo, pues se evaluó la conexión entre la ética empresarial percibida y la responsabilidad social en las empresas comerciales en función al alcance correlacional. El muestreo aplicado fue probabilístico en un orden aleatorio simple de 384 personas. Los resultados revelaron que la mayoría de los clientes no perciben la ética de la empresa y la responsabilidad social empresarial (RSE) como construcciones separadas. Sin embargo, se evidenció que las empresas mejoran sus prácticas de responsabilidad social empresarial (RSE) y marketing verde para formular estrategias de sostenibilidad basadas en los factores mencionados.
The Implementation of Tongue Twister Method to Improve Students’ English Pronunciation
Authors: Haz Hamzah , Imansari Nurul , Nurhaeni Nurhaeni
Published: December 2022

This study aims to determine the effectiveness of the use of the tongue twister method on students' pronunciation. This research employed quantitative research with a quasi-experimental design. The population of this study is the second-grade students of SMAN 1 Campalagian, 150 students, and the sample consists of 32 students who are divided into two groups; the control group (16 students) and the experimental group (16 students). The control group was taught using the song technique while the experimental group was taught using the tongue twister method. The researchers used test (Pre-test and post-test) as the instrument in the study. Based on the test results, the researchers conclude that the average post-test score is higher than the pre-test, those are (60>55) and (75>65). This research indicates that there is a significant difference in value between the two. Therefore, it can be concluded that students make improvement in learning pronunciation through tongue twisters.
Reduplikasi Bahasa Sahu
Authors: Ridwan Ridwan , Umar Junaib
Published: December 2022

Penelitian ini bertujuan untuk mendeskripsikan jenis reduplikasi bahasa Sahu. Jenis penelitian digolongkan ke dalam penelitian kualitatif. Lokasi penelitian dilaksanakan di Awer Sahu Timur. Instrumen yang digunakan berupa alat perekam (tape recorder), catatan lapangan, kosaka kata Morris Swadesh, dan cerita rakyat. Teknik analisis data berupa data reduction (reduksi data) , data display (penyajian data), dan conclusion drawing/verivication (penarikan simpulan/verifikasi). Hasil penenlitian ditemukan bahwa bahasa Sahu memiliki empat jenis reduplikasi yaitu: pengulangan seluruh, Pengulangan  Sebagian, pengulangan yang berkombinasi dengan proses pembumbuhan afiks, dan pengulangan dengan perubahan fonem.
Prevalência e distribuição espacial das infecções sexualmente transmissíveis, HIV/AIDS e Hepatites B e C no município de Fernandópolis SP
Authors: Silva Milena Carla Queiroz , Vanzela Luiz Sergio , Figueira Thiago Gomes , Zonta Marco Antonio , Parizotto Nivaldo Antonio
Published: December 2022

Considerando os direitos humanos fundamentais, pode-se destacar os direitos sexuais e os direitos reprodutivos, e o seu respeito promove a vida em sociedade, o estudo de mecanismos de controle de infecções causadas por infecções sexualmente transmissíveis (IST´s) é tema de interesse de diferentes profissionais envolvidos na saúde pública. O objetivo deste estudo foi identificar o número de casos de HIV/AIDS e Hepatites Virais (B e C) do município de Fernandópolis nos anos de 2016 a 2020 e por georreferenciamento, analisar a sua incidência e prevalência dos mesmos no município de Fernandópolis. Como resultado, encontrou se que 21,43% de gestantes HIV positivo com idade de 15 a 25 anos e 78,57% em gestantes com idades de 26 a 45 anos. Notificações de HIV/AIDS no período de 2016 a 2020 foram num total de 215 casos os quais, 11,17% na faixa etária entre 15 e 25 anos e 29,77% na faixa etária de 38 a 48 anos tendo uma correlação espacial moderada (r=0,621) entre essas faixas etárias, sendo o maior acometimento nos bairros mais populosos. Nas notificações das Hepatites Virais (B e C) a menor incidência foi na faixa etária de 15 a 25 anos (2,45%) e a maior incidência na faixa etária de 55 a 70 anos (34,97%) com baixa correlação espacial entre essas faixas etárias (r=0,427). As evidências científicas desta pesquisa poderão subsidiar o processo de tomada de decisão, a formulação e a implementação de políticas públicas destes agravos, dentro do programa de enfrentamento para as IST´s designados pelo SUS.