bluuebunny/crossref_metadata_2025 huggingface dataset:
Continuous accounting implementation for a new future: opening the black box through green transformational leadership by surveying Indonesia banking employees
Authors: Widiyati Dian , Murwaningsari Etty , Gunawan Juniati
Published: May 2023

This study intents to examine and analyze the continuous accounting implementation with green transformational leadership as moderation variable by conducting a survey. Accounting produce services that impacted by the industrial revolution, so that they need to prepare for the challenges of an industry that clings to inflexible rituals and indecision in adopting complex designs, technologies and processes. This study uses primary data through questionnaires survey. The sample was 614 employees of the finance and information technology division at banks registered with the Bank Based on Core Capital Group. The result present that digital capability has positive influence on continuous accounting implementation as well as green human capital and green transformational leadership. While, cybersecurity awareness has no influence on continuous accounting implementation. Green transformational leadership is strengthening influence cybersecurity awareness to continuous accounting implementation while the rest have no moderation effect. The implications of this study are theoretically the development of new measurements for digital capability. The practical implication is by increasing digital capability, companies can have special programs that focus on self-development in terms of technology. Accounting as one of the branches of science affected by technology needs to update the method of storing accounting data securely. The Indonesian Institute of Accountants can make regulations regarding continuous accounting. Finally, the implication for the banking is to be able to pay more attention to cybersecurity by creating specific cybersecurity programs
Identification and damping of low-frequency oscillations based on WAMS data and the revisited residue method – part I
Authors: Bektimirov Anur , Malik Om Parkash , Saukhimov Almaz , Didorenko Eugene
Published: May 2023

The results of low-frequency oscillations identification in the Republic of Kazakhstan power grid by using a Wide Area Measurement System are presented and an algorithm for damping low-frequency oscillations is proposed in this paper. Analysis of weakly damped inter-area low-frequency oscillations revealed a constant mode with a frequency range of 0.3‒0.4 Hz. It was determined that at these low-frequency oscillations, the amplitude of active power fluctuations along the transmission line was 150 MW with a duration of 9 minutes. The modal analysis calculation of the Republic of Kazakhstan power system model in the «DigSilent Power Factory» software shows the dangerous low-frequency oscillation modes having a damping ratio is 2.2 % and an eigenfrequency 0.328 Hz. These oscillation modes identified by the real data and in the developed model indicate the incorrect tuning of power system stabilizer parameters at power plants. It is necessary to retune the power system stabilizer parameters whenever changing the system’s and mode’s configurations.
An analysis of existing power system stabilizer tuning methods was performed, and revisited residue method was determined as sufficiently effective. Thus, the developed algorithm for identification and damping of low-frequency oscillation consists of three tasks. The first task is data collection from the Wide Area Measurement System and Supervisory Control and Data Acquisition system and updating the calculation model based on the current status of equipment (generators, transformers, transmission lines, etc.). The second task is the identification of dangerous electromechanical oscillations and modal analysis based on information obtained in real-time. The third task is tuning the power system stabilizer parameters for damping dangerous low-frequency oscillation modes based on the revisited residue method
Determining the effect of plasmochemically activated aqueous solutions on the bioactivation process of sea buckthorn seeds
Authors: Kovalova Olena , Vasylieva Natalia , Stankevych Serhii , Zabrodina Inna , Haliasnyi Ivan , Gontar Tatiana , Kotliar Oleh , Gavrish Tatiana , Gill Michael , Karatieieva Olena
Published: May 2023

The studies revealed the regularities of obtaining bioactivated sea buckthorn seeds using plasma-chemically activated aqueous solutions during germination. Sea buckthorn seeds were chosen as the research object. Plasma-chemically activated aqueous solutions were used to activate the germination process. This made it possible to solve the problem of processing waste from the production of sea buckthorn oil, and also contributed to obtaining a high-quality component of food products.
Experimental studies have proven the effectiveness of using plasma-chemically activated aqueous solutions as effective intensifiers and disinfectants for the process of bioactivation of sea buckthorn seeds. It is shown that their use intensifies the germination of sea buckthorn seeds, contributes to a more active accumulation of biologically valuable components in the seeds. Plasma-chemically activated aqueous solutions with a peroxide concentration of 300–700 mg/l were used. An increase in the geometric parameters of seeds, namely length by 8.5–14.9 % and width by 3.7–14.8 %, was recorded. The germination energy increased by 5–13 % and germination capacity by 5–14 %. The composition of sea buckthorn seeds, both derived raw material and bioactivated, was investigated. Studies have shown that bioactivated seeds contain an increased amount of highly valuable substances. The protein content increased by 4 % compared to sea buckthorn seeds and by 1.7 % compared to the control. The lipid content increased by 2 and 1.1 %. An increase in the content of vitamins was noted: B1, B2, C, A, E, R. The amount of amino acids increased by 9–13 % compared to the control, and compared to the original raw material – by 1.5–3.5 times. In addition, plasma-chemically activated aqueous solutions effectively disinfected the raw material.
The presented technology can be used in the food processing industry
Determining the thermal-physical characteristics of a coke foam layer in the fire protection of cable articles with foaming coating
Authors: Tsapko Yuriy , Likhnyovskyi Ruslan , Tsapko Аleksii , Kovalenko Vitalii , Slutska Oksana , Illiuchenko Pavlo , Kravchenko Rostyslav , Sukhanevych Maryna
Published: May 2023

An issue related to using cable products for building structures is to ensure their stability and durability when operating within wide limits. Therefore, the object of research was a change in the properties of the polymer sheath of the cable during the formation of a swollen coating layer under the influence of high temperature. It is proved that in the process of thermal action on the flame retardant coating, the process of thermal insulation of the cable involves the formation of particulate products on the surface of the sample. Under the action of the burner flame, a temperature was reached on the surface of the sample, which led to a swelling of the coating of more than 16 mm. The measured temperature on the inverse surface of the sample was no more than 160 °C, which indicates the formation of a barrier for temperature. In this regard, a calculation and experimental method for determining thermal conductivity when using a flame retardant as a coating has been developed, which makes it possible to estimate the coefficients of temperature conductivity and thermal conductivity under high-temperature action. According to the experimental data and established dependences, the coefficients of temperature conductivity and thermal conductivity of wood were calculated, which are 214.4·10–6 m2/s and 0.62 W/(m∙K), respectively, due to the formation of a heat-insulating swollen layer. The maximum possible temperature penetration through the thickness of the coating was assessed. A temperature was created on the surface of the sample, which significantly exceeds the ignition temperature of the polymer sheath of the cable, and, on a non-heated surface, does not exceed 160 °C. Thus, there is reason to argue about the possibility of directed adjustment of the fire protection processes of an electrical cable by using coatings capable of forming a protective layer on the surface of the material, which inhibits the rate of heat transfer.
Determining the role of emotions in the customer journey for culture industries under conditions of information and communication technologies development
Authors: Tymchenko Yuliia , Proskurina Mariia , Hryhorchuk Taras , Chervinska Lesya , Ratynskiy Vadym , Shpylyk Svitlana , Krause Olga , Pinyak Iryna , Lebedynets Iryna , Nosyriev Oleksandr
Published: May 2023

The object of research is the purchasing behavior of consumers of cultural products. The aim of the study is to determine the model of consumer decision-making about the purchase of cultural products, taking into account the emotional component under the conditions of development of information and communication technologies. It has been established that macroeconomic factors in the formation of marketing of cultural industries are characterized by a number of features, among which the development of information and communication technologies is key. Making a consumer decision regarding a cultural product depends on its economic and cultural values but is determined by its emotional value. The proposed model of influence of emotional value makes it possible to determine the likelihood of a positive consumer decision in relation to a particular cultural product or brand. Evaluation of the impact of the spread of information and communication technologies on the consumption of cultural products proved the existence of a link between the number of Internet subscribers and household spending on culture and recreation. However, most cultural products consumed via the Internet or television are free or obtained free of charge from unofficial sources (the so-called "pirated" content). It was found that half of consumers do not attend cultural events at all due to lack of funds, time, or remoteness of the event. At the same time, the main channels and sources of information of consumers of cultural products are the Internet and television. It has been established that emotional marketing realizes itself as fully as possible through a loop-like model of bringing commercially important information to the final consumer of cultural products. In this process, digital marketing technologies, especially digital platforms, play a key role as a tool. The practical significance is in the possibilities of applying the data obtained in the process of developing marketing programs for subjects of cultural industries.
Building a model of the goods delivery system that uses unmanned aerial vehicles based on priority
Authors: Knysh Bogdan , Kulyk Yaroslav
Published: May 2023

This paper considers the organization of a goods delivery process, which is selected as the study object. It has been established that the main problems that arise in this case can be caused, for example, by the imperfection of infrastructure and transport for delivery. This can be partially solved through the use of unmanned aerial vehicles for the delivery of goods, as well as by solving tasks related to effective control over their movement. However, there is another issue associated with the insufficient efficiency of existing mathematical models of goods delivery systems involving unmanned aerial vehicles since the maximum possible delivery speed is not provided. Therefore, there is a need to find a better solution to this problem.
A model of the goods delivery system that uses unmanned aerial vehicles based on priority has been built. The resulting model takes into account the intensity of requests and provides a shorter waiting time in the queue, and therefore a greater delivery speed.
Models of single-channel and multichannel goods delivery systems with failures and expectations were investigated according to probability. It was found that the devised goods delivery system is on average less loaded per unit of time and makes it possible to serve more orders while incoming orders are in line for less time. The same models have also been investigated according to the waiting time in the queue. It has been established that the devised goods delivery system provides a shorter waiting time in the queue. At the same time, the deviation between the theoretical and experimental values of probabilities and waiting time is 2 % and 3 %, respectively, which allows us to assert high accuracy of the results and the devised model as a whole.
The results reported here could be used in practice in the absence of an extensive network of logistics and sales and remoteness of recipients
Development of ways to saving energy when operating winding machines
Authors: Makhmudova Nigar
Published: May 2023

Energy efficiency or energy saving is the practical implementation of scientific, technical, economic and industrial measures aimed at the efficient use of energy resources. Therefore, one of the challenges facing the textile industry is energy saving in technological processes in the production of products. To solve this problem, it is proposed to introduce into production advanced technological processes with low energy costs, the use of technological equipment equipped with electric motors with high rates of consumed electrical energy. This problem is also inherent in winders and similar machines equipped with a bobbin changer.
Since most of the time of operation of these devices is wasted and, accordingly, electricity is also wasted. However, to date, these issues have not been given due attention, and studies on this subject have not been conducted. In this work, the operation of the apparatus for changing bobbins in winding and similar machines has been studied in order to reduce power consumption.
As a result of the study, a mathematical model of the relationship between the operating mode and technological parameters of machines and apparatuses was obtained, which makes it possible to identify ways to eliminate shortcomings in their work.
Discontinuous, on signal and sectional methods of operation of the apparatus for changing bobbins have been developed, which make it possible to reduce power consumption on winding machines by 2.8–4.2 times compared to the existing method of operation. And the autonomous method of operation of the device, proposed in the work, completely eliminates the consumption of electricity consumed by the device for changing bobbins. The results of the study can be used in spinning and weaving mills.
Applying machine learning to improve a texture type image
Authors: Tussupov Jamalbek , Kozhabai Kairat , Bayegizova Aigulim , Kassenova Leila , Manbetova Zhanat , Glazyrina Natalya , Mukhamedi Bersugir , Yeginbayev Miras
Published: May 2023

The paper is devoted to machine learning methods that focus on texture-type image enhancements, namely the improvement of objects in images. The aim of the study is to develop algorithms for improving images and to determine the accuracy of the considered models for improving a given type of images. Although currently used digital imaging systems usually provide high-quality images, external factors or even system limitations can cause images in many areas of science to be of low quality and resolution. Therefore, threshold values for image processing in a certain field of science are considered.
The first step in image processing is image enhancement. The issues of signal image processing remain in the focus of attention of various specialists. Currently, along with the development of information technology, the automatic improvement of images used in any field of science is one of the urgent problems. Images were analyzed as objects: state license plates of cars, faces, sections of the field on satellite images.
In this work, we propose to use the models of Super-Resolution Generative Adversarial Network (SRGAN), Extended Super-Resolution Generative Adversarial Networks (ERSGAN). For this, an experiment was conducted, the purpose of which was to retrain the trained ESRGAN model with three different architectures of the convolutional neural network, i.e. VGG19, MobileNet2V, ResNet152V2 to add perceptual loss (by pixels), also add more sharpness to the prediction of the test image, and compare the performance of each retrained model. As a result of the study, the use of convolutional neural networks to improve the image showed high accuracy, that is, on average ESRGAN+MobileNETV2 – 91 %, ESRGAN+VGG19 – 86 %, ESRGAN+ResNet152V2 – 96 %.
Optimizing biogas production using artificial neural network
Authors: Komarysta Bohdana , Dzhygyrey Iryna , Bendiuh Vladyslav , Yavorovska Olha , Andreeva Antonina , Berezenko Kateryna , Meshcheriakova Iryna , Vovk Oksana , Dokshyna Sofiia , Maidanskyi Ivan
Published: May 2023

The object of this study is the operating parameters of the anaerobic digestion unit. The study aims to increase the potential of biogas production. The task to select the optimal parameters of the working process of anaerobic digestion has been solved.
A model of cumulative biogas and methane output in the process of anaerobic waste digestion has been constructed, which is conceptualized using the method of artificial neural network. The model is built on the basis of 11 process-related variables, such as hydraulic retention time, pH, operating temperature, etc.
The plant parameters, leading to the highest volume of biogas production, were selected. It was determined that the optimal amount of biogas can be brought to 90 %, which exceeds the maximum value obtained from factory records by 12.6 % to 700 m3/t. Working conditions that led to optimal methane production were defined as the temperature of 39 °C, the total solids of 4.5 %, the organic percentage of 97.8 %, and pH 8.0.
It was found that biogas production is the highest at temperature within the thermophilic range while the local maximum is achieved in the mesophilic temperature range.
The model built serves to determine the optimal operating parameters for maximum biogas production and could be used to optimize biogas production productivity using limited experimental data. The model also makes it possible to predict the performance of anaerobic digestion under untested conditions.
It is possible to practically use the developed biogas production model when monitoring the operation of the anaerobic digestion unit, to increase the efficiency of the process, and when adjusting the working conditions of the methane tank
Improving empirical models of complex technological objects under conditions of uncertainty
Authors: Gorbiychuk Mykhail , Kropyvnytskyi Dmytro , Kropyvnytska Vitalia
Published: May 2023

This paper proposes a method for improving empirical models of complex technological objects with insufficient information about the input and output values of an object's parameters. It has been established that most methods for constructing empirical models require knowledge of the statistical characteristics of the input and output values of an object. When modeling complex non-reproducible stochastic processes that evolve over time, information about the parameters and structure of an object is usually not available. A method has been proposed where input and output values are treated as fuzzy quantities with a triangular membership function. Since at some points in the region, the triangular membership function is undifferentiated, it is inconvenient to use it in its typical form to solve the problem of optimal control. Therefore, it is proposed to approximate it with the Gaussian membership function. It is shown that such an approximation is reduced to finding one parameter, which is determined by the least squares method. Its value practically does not depend on the magnitude of the uncertainty interval while the value characterizing the accuracy of approximation is a monotonously increasing function that has a linear character. This makes it possible to define the main operations on fuzzy numbers and derive an empirical model for the case of a polynomial "base" model. The resulting model is linear in its parameters, so a genetic algorithm can be used to find them. It is shown that genetic algorithms can be used in the construction of empirical polynomial models when input parameters are interpreted as fuzzy numbers.
Thus, it can be argued that when constructing an empirical model of an object that is affected by external disturbances that cannot be measured, it is advisable to approximate all input quantities with a triangular Gaussian membership function
Comparison of bicoherence on the ensemble of realizations and a selective evaluation of the bispectrum of the dynamics of dangerous parameters of the gas medium during fire
Authors: Pospelov Boris , Rybka Evgenіy , Polkovnychenko Dmytro , Myskovets Iryna , Bezuhla Yuliia , Butenko Tetiana , Harbuz Serhii , Prokhorova Larysa , Levada Olga , Kravtsov Mikhail
Published: May 2023

The object of the study is the bicoherence of the bispectrum assessment of the dynamics of dangerous parameters of the gas environment during the ignition of materials. The subject is a measure of bicoherence of the bispectrum estimation from the ensemble of realizations and selective bispectrum estimation for the dynamics of hazardous parameters of the gas environment. The practical importance of the research is the use of the measure of bicoherence of the bispectrum for the early detection of fires. The measure of bicoherence of the dynamics of hazardous parameters of the gas environment is substantiated, which allows them to be numerically compared for the studied bispectrum estimates. As such measure, it is proposed to use the integral value of bicoherence for a given frequency interval, which makes it possible to numerically compare the bicoherence of bispectrum estimates for arbitrary time intervals of the dynamics of hazardous parameters of the gas environment. On the basis of the proposed measure for the frequency range of 0.2–2 Hz, a comparison of the integral bicoherence of the bispectrum estimates was made. The numerical value of the measure was determined for three fixed time intervals of the dynamics of hazardous parameters of the environment, corresponding to the absence of ignition, the occurrence of ignition, and the subsequent burning of test materials in the laboratory chamber. According to the results of the comparison of such values, it was established that the bicoherence of the bispectrum estimation from the ensemble of realizations is the most appropriate for detecting fires. When ignited, the numerical value of the measure for all test materials is about 90°. This means that the nature of the dynamics of hazardous environmental parameters in the event of fires becomes random. In this regard, the proposed measure is recommended to be used as a test for early detection of fires.
Assessing the effect of mechanical deformation of the panasonic NCR18650B lithium-ion power cell housing on its fire safety
Authors: Lazarenko Oleksandr , Hembara Taras , Pospolitak Vitalii , Voytovych Dmytro
Published: May 2023

This paper considers the deformation properties of the body of the lithium-ion power cell (LIPC) Panasonic NCR18650B (LiNi0.8Co0.15Al0.05O2) exposed to the action of static load at various techniques of fixing the cell. Determining the properties of LIPCs under appropriate conditions makes it possible to fill the gap in existing studies, which will further ensure the safety of their use.
Based on the results of experimental studies, the LIPC rigidity and temperature indicators were determined in accordance with the applied load. The most dangerous variant, from the point of view of fire danger, of applying a static load on the cell has been established.
It was experimentally established that, on average, the Panasonic NCR18650B LIPC housing can withstand a load of about 80 kg·s/cm2 (or 7.84 MPa) without further ignition. An increase in pressure force in the range exceeding 85–90 kg·s/cm2 leads to an irreversible chain thermochemical reaction, which, within 2–3 seconds, leads to LIPC ignition. Compressing the LIPC evenly along its lateral surface showed the occurrence of combustion at the load on the cell equal to 150 kg·s/cm2. The average temperature of the cell during combustion caused by the deformation of the housing is 350–450 °C, and the maximum value is registered in the range of 580–680 °C.
The mathematical model built on the basis of the mathematical theory of thin shells adequately describes the stressed-strained state of the cylindrical body of cells under the action of a force concentrated and distributed load. The estimation model is satisfactorily verified by experimental results, making it possible to improve the strength and rigidity of LIPC housing by choosing the appropriate steel grade for its body, the geometric dimensions, and the structural technique of its fastening.
Development of risk-based inspection of 28-years-old subsea sales gas pipelines to support the energy demand
Authors: Soedarsono Johny , Wijaya Arie , Aditiyawarman Taufik , Kaban Agus , Riastuti Rini , Ramdhani Rizal Tresna , Ayende Ayende
Published: May 2023

In the oil and gas industry, maintaining the integrity of production equipment is critical to ensuring the industry’s sustainability. Failure to maintain the integrity of production equipment can result in financial losses for the business. The management of production equipment nearing the end of its design life faces an increasing cost of Inspection, Maintenance, and Repair (IMR). As a result, a strategy to improve the efficiency of IMR is essential. Recent IMR management practices include predictive Risk-Based Inspection (RBI), which is more efficient than Time-Based Inspection (TBI). The research intends to evaluate the 28-year-old subsea sales gas pipeline using API 581 standard quantitative methodology by utilizing the Inline Inspection (ILI). Specifically, the study focuses on measuring the Probability and Consequence Failure of inspected pipelines. The inspection interval is determined based on the minimum allowable thickness. The risk calculation indicates that 12 pipeline segments are at a medium risk level (3 segments, 1D and 1E, and 2C). The remaining nine segments remain at lower risk (1C). Based on the result, segment nine is accepted as the highest PoF value of 1.04E-4 failures per year due to high depletion values due to the higher CoF value at the leak location. The calculation of the inspection interval indicates that the forthcoming Inspection will be due 20 years post the previous assessment. Another method using the Estimated Repair Factor (ERF) thickness limit approach produces the same results. However, assessment using ASME B31.8S provides different results of 10 years intervals when using the same ILI inspection method. This work can be used as a standard guideline to assess the risk of pipelines over a decade in service
Improving the manufacturing technology of sensing gas sensors based on zinc oxide by using the method of magnetron sputtering on direct current
Authors: Miasoiedova Alona , Minska Natalia , Shevchenko Roman , Azarenkо Olena , Lukashenko Viktoriia , Kyrychenko Oksana , Zemlianskyi Oleh , Trefilova Larisa , Kamyshentsev Gennady , Melezhyk Roman
Published: May 2023

A gas sensor based on zinc oxide obtained by magnetron spraying at direct current was investigated. There are methods of deposition of zinc oxide nanostructures such as thermal evaporation, chemical vapor deposition, organometallic chemical vapor deposition, magnetron sputtering, pulsed laser deposition, and hydrothermal process. The least investigated is magnetron sputtering. To obtain films, a vacuum unit VUP-5M with an original material-saving magnetron was used. Studies into the sensitivity and speed of the gas sensor based on ZnO with respect to the target gas – ethanol of different concentrations – were carried out. The resulting experimental dependences of the sensitivity of the gas sensor on the concentration of the target gas demonstrate that with increasing concentration of the target gas, the resistance decreased while the sensitivity of the sample increased. It was established that the change in the resistance of the test sample is proportional to the change in the concentration of the target gas. After the sensor surface becomes saturated with adsorbed molecules, the resistance no longer decreases, even if the gas concentration continues to increase. The reaction of the gas sensor to the target gas – ethanol – at concentrations above 150 ppm was almost absent. The time required to achieve the maximum response value should be lower at higher target gas concentrations. Sensitivity reaction repeatability studies were conducted to measure the resistance of a gas sensor based on ZnO in a target gas atmosphere with a concentration of 150 ppm. It was found that the gas sensor demonstrates excellent stability and consistent sensitivity reaction when re-exposed to the target gas – ethanol. It was established that the reaction time of a gas sensor based on ZnO to the target gas at each repeated exposure does not exceed 10 s. This repeatability index allows us to assert the stability of the ZnO-based gas sensor in an ethanol atmosphere under standard conditions
Construction of a visual model of people’s movement to manage safety when evacuating from a sports infrastructure facility
Authors: Ivanusa Andriy , Marych Volodymyr , Kobylkin Dmytro , Yemelyanenko Sergiy
Published: May 2023

By applying the probabilistic method and optimization synthesis of flexible technological lines, topological models have been built of safety-oriented management of human flows and evacuation time using the «Arena Lviv» stadium as an example. They are necessary to calculate the time of evacuation of people to a safe zone. When people leave the stadium sectors on the promenade, their flow is significantly modified. Therefore, the calculation of the time of evacuation of people requires the use of different procedures depending on the type of human flow in order to obtain more accurate results. There may be several such cases on one evacuation route and significantly more during the evacuation of people from all sectors and premises of the stadium administrative building as a whole. Thus, a lot of time is spent on choosing the right procedure and initial data for calculation if we use existing classical verbal models, which is their disadvantage. Verbal models have a large volume, they need to be repeatedly re-read in order to determine the numerical values of factors affecting the flow of people while topological models are much more compact. Topological models make it possible to visually present more complete information about the evacuation process, and this makes it possible to quickly select the initial data for calculating the time of evacuation of people at the next evacuation site.
The time of evacuation of people from the «Arena Lviv» stadium was calculated; the evacuation system happened to not comply with the accepted standards. In particular, the time of evacuation of people from the structure exceeded eight minutes. Using the critical path method, bottlenecks of the stadium evacuation system were identified, and human flows were redistributed, which made it possible to reduce the total evacuation time to acceptable indicators
Case study of shear strengthening of RC Corbels by steel plates using fea
Authors: Hashim Doaa Talib , Abdulghani Ali Wathiq , Albegmprli Hasan Mohammed Ahmed
Published: May 2023

The study aimed to explore the possibility of strengthening RC corbels with many strengthening techniques. The research analyzed the RC corbels behavior under a wide range of variables. The theoretical study consisted of twelve models reinforced with GFRP bars with strengthening by steel plate. Finite element analysis with ANSYS APDL was used to verify five specimens. This research deals with a static nonlinear FE simulation to investigate the behavior of RC Corbels reinforced internally and externally. The verification with experimental work demonstrated a satisfactory agreement in the load-displacement relationship, ultimate load and displacement, and failure mode. The parametric study was implemented which included strengthening the four concrete corbels externally and four corbels internally by a steel plate in many configurations while the remaining three were modeled with varied compressive strength (30, 40, and 50) MPa. The external strengthening included the placing of steel plate externally around the corbel in a U-shaped form and partial strengthening by strips and bottom plate. The models with internal strengthening involved placing the steel plate internally instead of stirrups. The results discovered that the strengthening provided enrichments in the stiffness, ductility, and energy absorption by 37 %, 4 %, and 26 %. In addition, in the case of full external strengthening more than internal retrofitting, there is a maximum improvement in the cracking and ultimate load carrying capacity. The external strengthening was better than internal one due to the confinement effect of the concrete. The stress distribution and crack pattern were affected by the strengthening techniques and more cracks appeared in the corbels with external steel plates.
Development of a multilingual intelligent project planning and monitoring system
Authors: Teslia Iurii , Yehorchenkova Nataliia , Yehorchenkov Oleksii , Khlevna Iulia , Kataieva Yevheniia , Klievanna Ganna , Khlevnyi Andrii , Latysheva Tatiana , Ivanov Ivan , Sazonov Anton
Published: May 2023

The object of research of this work is the processes of project planning and monitoring. The solved problem is the development of a model, method and structures of a multilingual intelligent project planning and monitoring system and its experimental verification of the ability to understand the statements of managers in different languages.
The requirements for such a system are formulated. An analysis of the existing theoretical and practical developments in this area was carried out. It was established that there are no developments in the field of project management that can adapt to new natural languages. It was found that the formulated requirements can be satisfied within the framework of the reflexive approach. It is characterized by simplicity, continuity, and insensitivity to errors in natural language statements. To confirm these assumptions, an experimental multilingual project planning and monitoring system and experimental research methodology were developed.
The results of the experiments obtained during the use of the created experimental system testify to the correct identification of the content of appeals to the intellectual system in 6 languages with a probability higher than 0.99, and to recognize the structure of statements with a probability higher than 0.98. And the time for configuring the system to work with a new language did not exceed 1 hour. This allows to use it for practical work in distributed management systems for remote interaction of managers and specialists with the system in different languages.
The conducted experiments confirmed the assumption about the effectiveness of the reflexive approach for creating project management systems.
The developed model, method, structures, and system can be used for different types of projects, such as regional development projects, IT, etc.
Determination of the aerodynamic characteristics of a wind power plant with a vertical axis of rotation
Authors: Tanasheva Nazgul , Tleubergenova Akmaral , Dyusembaeva Ainura , Satybaldin Amangeldy , Mussenova Elmira , Bakhtybekova Asem , Shuyushbayeva Nurgul , Kyzdarbekova Sholpan , Suleimenova Saniya , Tussypbayeva Ardak
Published: May 2023

Wind energy is a commercially proven and rapidly developing type of electricity generation. Wind power plants with a vertical axis are more attractive and better suited for use in cities and urban environments where wind flow is less predictable compared to widespread wind power plants with a horizontal axis of rotation. This makes them a much better choice for both ground installation and/or for mounting on buildings and roofs that would otherwise limit the installation of higher horizontal turbine structures.
The paper describes an experimental study of the drag force and its coefficient for wind turbines with a vertical axis of rotation. The object of the study is a laboratory model of a wind turbine with blades made in the form of rotating cylinders with a fixed blade. Experimental studies were carried out in the T-1-M wind tunnel, measurements of aerodynamic force were carried out using three-component scales. A distinctive feature of the work is the combined use of the lifting force of the cylinders, as well as the lifting force of the fixed plate. Due to this solution, when comparing with existing wind turbines with a vertical axis of rotation, it was found that the wind turbine in question prevails by 25‒100 % in the number of revolutions. The dependences of the drag force on the flow velocity and the drag coefficient on the Reynolds number from 1·104 to 4·104 are obtained. An uncertainty analysis was also carried out in order to determine the uncertainty by type A, B and the total uncertainty, from which it was found that the measurement error was 1.13 %. The field of the practical application of the results obtained in laboratory studies will be useful in the development of prototypes of wind turbines with a vertical axis of rotation
Power analysis of thyristor-regulated reactor with fully controlled semiconductor valves
Authors: Fediv Yevhen , Sivakova Olha
Published: May 2023

Flexible AC transmission systems that are built by using modern advances in power electronics are key components of smart grids. The object of research is a thyristor-controlled reactor, which is used as part of a static reactive power compensator to control the reactive power in the transmission and distribution electrical networks of power supply systems. It is proposed to use two-operation semiconductor gates in the regulator, which made it possible to obtain qualitatively new adjusting properties. The analysis of reactor power under the mode of phase control of the conductive state of gates by setting the moments of their closing time was carried out. Analytical expressions for angular power characteristics of the main harmonic were derived. It was revealed that by regulating, based on the phase principle, the conductive state of ideal semiconductor gates, which are switched on in series with ideal inductance, along with the adjustment of reactive power, the phenomenon of consumption of active power from the grid at the main harmonic is observed. It is shown that the reason for this is artificially obtained, with the help of semiconductor gates, active-inductive nature of the angle of displacement of the main harmonic of the current in the reactor relative to the voltage of the power supply. The study results prove the effect of adjusting the active power by a thyristor-regulated reactor. Research involving a virtual model illustrated the adjustment of the active power component of a synchronous generator by the effect on the rotor speed during gate adjustment of reactor power. The active power resource obtained in the process of thyristor adjustment of the reactor is commensurate with its installed capacity
Determination of the ballistic performance ramie-fiber-reinforced epoxy composite-sic ceramic in multilayered armor system
Authors: Mukhammad Alaya Fadllu Hadi , Rusnaldy Rusnaldy , Ismail Rifky , Riyadi Tri Widodo Besar
Published: May 2023

Multilayered Armor System (MAS) is being extensively studied around the world for its ability to retain ceramic fragmentation after a collision occurs. MAS consist of a ceramic layer placed at the front and supported by a composite layer of ramie-fiber-reinforced epoxy resin. Present study utilizes natural fibers of 50 % ramie fibers with epoxy resin as the matrix and Silicon Carbide (SiC) ceramic as the front panel. The ballistic testing in this study used 7.62×51 mm NATO Ball projectile with a firing distance of 15 m from the bullet panel. The velocity of projectile was detected using LIGHT SCREEN B471 type. The aim of the study is to conclude the optimal thickness of ramie fiber-epoxy and SiC ceramics MAS structure based on experiments which can withstand 7.62 NATO ball bullet penetration.  To achieve this aim, the following objectives are accomplished: study the effect of SiC ceramic addition to ramie composite on BFS and study the effect of SiC ceramic addition to ramie composite on failure mode. Results show that the addition of the number of layers of SiC increases resistance of ballistic MAS marked by a decrease in the value of BFS clay. The 5SiC+10R is the optimal thickness in resisting the penetration of 7.62×51 mm bullets with 12 mm BFS clay. Failure phenomena found in this study were projectile fragments, matrix cracks, radial cracks, impact points, and ceramic fragments. Matrix crack formation appears on 5SiC+10R with mini deformation in rear side. Phenomenon of ceramic fragmentation in the shot causes the MAS structure to be damaged, so that the ramie fiber composite layer will face the bullet directly if it is subjected to a second shot. Ultra High Hardness Armor (UHHA) as first layer on the MAS structure is an attractive option for further research.
Development of the spectrophotometric method for the determination of rosuvastatin in tablets by using bromophenol blue
Authors: Halka Liudmyla , Kucher Tetyana , Kryskiw Liubomyr , Piponsk Marjan , Furdela Iryna , Uglyar Tetyana , Poliak Olha , Logoyda Liliya
Published: May 2023

The aim of the work was to develop a spectrophotometric method for the determination of rosuvastatin in tablets based on the reaction with BPB in compliance with the principles of «green» chemistry.

Material and methods. Analytical equipment: two-beam UV-visible spectrophotometer Shimadzu model -UV 1800 (Japan), software UV-Probe 2.62, electronic laboratory balance RAD WAG AS 200/C. The following APIs, dosage forms, reagents and solvents were used in work: pharmacopoeial standard sample (CRS) of rosuvastatin calcium (Sigma-Aldrich, (≥ 98 %, HPLC)), BCG (Sigma-Aldrich, (≥ 98 %, HPLC)), "Rosuvastatin" tablets 10 mg, 15 mg, 20 mg, methanol (Honeywell, (≥ 99.9 %, GC)), ethanol (Honeywell, (≥ 99.9 %, GC)), chloroform (Honeywell, (≥ 99.9 %, GC)), acetonitrile (Honeywell, (≥ 99.9 %, GC)), and ethyl acetate (Honeywell, (≥ 99.7 %, GC)).

Results and discussion. A spectrophotometric method for determining rosuvastatin by reaction with BPB in an acetonitrile solution using the absorption maximum at a wavelength of 595 nm has been developed. Stoichiometric ratios of reactive components were established, which were 1:1. The developed method for the quantitative determination of rosuvastatin was validated following the requirements of the SPhU. The analytical method was linear in the 7.99-23.97 μmol/L concentration range. The LOD and LOQ values were calculated to be 0.77 µmol/L and 2.36 µmol/L. According to the «greenness» pictogram of the analytical method using the AGREE method, the score was 0.77, indicating that the proposed spectrophotometric method for determining rosuvastatin was developed in compliance with the principles of «green» chemistry.

Conclusions. An eco-friendly spectrophotometric method has been developed to quantitatively determine rosuvastatin in tablets based on the reaction with BPB. The appropriate sulfophthalein dye (BPB) and its concentration (4.00 x 10-4), the optimal eco-friendly solvent (acetonitrile), and the appropriate wavelength (595 nm) were chosen, and the sensitivity of the reaction was calculated. The analytical method was validated, and its possibility for use in the pharmaceutical analysis was shown
Obtaining the substance enoxaparin sodium equivalent to the original Clexane® and Lovenox®. Selection of technological parameters of the key stage of the synthesis
Authors: Bovsunovska Yuliia , Rudiuk Vitalii , Mishchenko Volodymyr , Georgiyants Victoriya
Published: May 2023

The aim: to carry out the key stage of synthesis to obtain a substance equivalent to the original drugs Clexane® and Lovenox® by determining the technological parameters of the synthesis that are critical from the point of view of the formation of the molecule and studying the correlation between the structural characteristics of Enoxaparin samples and the experimental conditions of the technological process.
Materials and methods: samples of the Enoxaparin sodium substance were synthesized according to the method described in the patent, as well as with a variation of the selected critical technological parameters. The obtained samples of Enoxaparin sodium were analyzed according to pharmacopoeial requirements, as well as by non-pharmacopoeial methods, such as two-dimensional NMR spectroscopy and size exclusion chromatography for detailed structural characterization of the molecule.
Results: determination and variation of technological parameters critical for the formation of the molecule, such as temperature, the amount of alkali for the depolymerization reaction, and the reaction time of the reaction mass, were determined and varied. Enoxaparin sodium samples were developed according to the selected parameters and a detailed analysis of the structure of the obtained samples was carried out, followed by a comparison with the original Clexane® and Lovenox®. It was established that with an increase in the temperature of the reaction mass, the amount of alkali and the holding time individually and in combination, the degree of depolymerization increases, which makes the composition of the molecule unbalanced in comparison with the original drugs Clexane® and Lovenox®.
Conclusions: As a result of the experiments, the technological parameters of the synthesis of a sample of Enoxaparin sodium were evaluated and determined, allowing to obtain a substance comparable to the originator in terms of chemical structure (alkali/ heparin benzyl ester ratio 0.06; temperature – 57 °C, reaction mixture holding time - 1.5 hours)