bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of the fixation point of the artificial popliteal muscle graft on the stability of the knee joint under external rotational load
Authors: Panchenko Serhii , Golovakha Maksym , Kolosov Dmytro , Onyshchenko Serhii , Zub Tetiana , Chechel Taras
Published: September 2022

This paper investigated the dependence of the stability of the knee joint, when exposed to external rotational load on the lower leg, on the position of the graft of the tendon of the popliteal muscle. Estimation finite-element models of the right knee joint of an adult were constructed, which included the articular ends of the bones that form this joint, as well as its main ligaments. The models reflected a surgery to restore posterolateral angle structures and differed only in the position of the popliteal tendon graft. That position was set by the point of attachment of the graft to the posterior surface of the tibia. At the same time, the fixation point changed both vertically and horizontally, in the frontal plane. In addition, a control model was built in which the hamstring tendon was completely absent. As a result of the calculations, patterns of the distribution of the fields of movement of the points of the finite-element model were obtained. As criteria for assessing the effectiveness of the selected position of the graft, movements of the lower leg model in the horizontal plane were proposed. Analysis of the results of the calculations showed that the greatest movements in all directions were obtained in the control model, in which the hamstring of the popliteal muscle was absent. The magnitudes of the considered movements derived from the control model exceeded the same values in the model with minimal movements by 17, 37, 17, 32, and 16 %. From the point of view of the stability of the tibia under rotational load, the most effective was the fixation of the graft on the posterior surface of the tibia as laterally as possible and closer to its articular surface. This is indicated by the magnitude of the movements, which, in this case, turned out to be the smallest in all directions.
Building an effective personnel risks management system of the organization
Authors: Podolchak Nazar , Tsygylyk Natalia , Dziurakh Yurii
Published: September 2022

The object of this study is a technique to reduce the personnel risks of an organization operating in a developing country under difficult conditions in order to improve the efficiency of staff. The form of ownership of the organization is state-owned, the number of employees is 120 people. The duration of the period for assessing the effectiveness of staff work and monitoring the impact of personnel risks on the organization is 4 weeks. It has been established that the organization has an integrated personnel risk management system. It enables fulfilling an average of 74 % of tasks and is not effective. Given this, an integrated personnel risk management system was developed based on the European approach. For this purpose, using technology transfer, information was obtained on the functioning of an effective personnel risk management system. After that, it was improved taking into consideration the peculiarities of the functioning of the organization when performing tasks. In addition, hard- and soft-skills of personnel were taken into consideration, thus, the complex effect of factors increasing the organization's resilience to personnel risks was taken into account. To implement the personnel risk management system in the organization's activities, a road-map was developed. Duration of implementation – 3 weeks. To assess the effectiveness of an integrated system for combating personnel risks, a comparative method was used for the qualitative and quantitative effectiveness of the tasks of 4 teams of the organization. Two of them worked according to the standard personnel risk management system, and 2 – according to the implemented one. The comparison was performed with the available data on the effectiveness of identical tasks for a period of 4 weeks. It has been established that the implemented comprehensive risk management system is effective, as it provides 100 % fulfillment of tasks under difficult conditions. The developed system can be used to improve the effectiveness of the tasks set for organizations in developing countries.
Comparative evaluation of the efficiency of the ring-type and bucket inlet devicesfor a power plant with a turbopropfan engine
Authors: Zhornik Oleg , Kravchenko Igor , Mitrakhovych Mykhailo , Balalaieva Kateryna
Published: September 2022

The increase in losses in the inlet device leads to an increase in specific fuel consumption. When integrating the inlet device and the propeller or propfan, it is necessary to take into consideration their interaction to ensure the maximum efficiency of the power plant. The object of this study is a coaxial propfan with the channel of the inlet device. The results reported here are of practical value: a methodology for designing a bucket S-shaped channel of the inlet device of a power plant with a turboprop engine has been developed. The dependence of the coefficient of preservation of the total pressure of the inlet device on the height and speed of flight was obtained, which makes it possible to take into consideration the influence of the propfan of a turboprop engine. A comparison of the characteristics of the ring-type and bucket S-shaped channel of the inlet device of the power plant with the turboprop engine was carried out. Specifically, it was found that the change in flight conditions has a less significant effect on the change in the coefficient of preservation of the total pressureof the ring-typeinlet device than the bucket one. A comparative assessment of the obtained results of mathematical modeling of the flow in the bucket S-shaped channel of the inlet device, taking into account the influence of the propfan, with the results of flight tests of the ring-type inlet device of the prototype is given. The comparative evaluation shows that the use of a bucket inlet device, instead of a ring-type inlet device, makes it possible to increase the full pressure recovery factor by 5–7 %. Thus, there is reason to argue that replacing the ring-type with a bucket inlet device will minimize hydraulic losses at the inlet to the engine and reduce the uneven flow at the inlet. That, in turn, will improve engine efficiency.
Development of a Bayesian belief network for the diagnosis of ventricular arrhythmias
Authors: Samadova Shafag , Khidirov Akif , Suleymanova Sitara , Mammadov Ruslan
Published: September 2022

Ventricular extrasystoles (VE) are considered the most dangerous type of heart rhythm disorders for human life, their timely detection, diagnosis and prevention are urgent issues of cardiology. In order to ensure the objectivity of diagnosis of VE, it is necessary to process a large amount of information related to the results of various medical studies, tests, anamnesis, accompanying diseases, etc., along with a long-term Holter ECG monitor. In order to process such a large amount of information and make a correct diagnosis, the issue of applying medical expert systems (MES) to doctors is currently relevant. ESs using probabilistic models based on Bayes' theorem are currently preferred because there are uncertainties in medical diagnosis issues that the same symptoms may be related to different diseases. The object of this study is the development and construction of a Bayesian belief network (BBN) for the purpose of diagnosing VEs. The choice of BBN is justified by the fact that they have the ability to combine several types of information, as well as the ability to manage uncertainties and work with incomplete information. The result of the application of the developed BBN is a probabilistic assessment of the diagnosis of VE. This network was built in the NETICA system from Norsys Software Corp. A distinctive feature of this work is that when compiling the table of conditional probabilities of BBN for the diagnosis of VE, together with the results of ECG and echo-ECG studies, data on the influence of additional factors that play a role in the occurrence of VE were used, such as the index of oxygen saturation of erythrocytes in the blood, changes in the thickness of the intima-media layer of the aortic artery and the amount of lipid fractions of blood plasma
Analysis of risks and safety indicators of raw materials and products of the sugar industry of Kazakhstan
Authors: Dautkanov Nurlan , Dautkanova Dina , Mussayeva Saltanat
Published: September 2022

The objects of research are the process of sugar beet processing, sugar beet, sugar and molasses.
The problem of determining critical control points in sugar beet processing and safety indicators of raw materials and products of the sugar industry was solved.
The results were obtained based on the risk analysis and the system of control points for sugar beet processing, five critical control points were identified according to the criteria of physical, chemical and biological contamination. It was also found that in terms of safety indicators, raw materials – sugar beet, and finished products meet the requirements of regulatory documents for microbiological indicators and heavy metal content.
The safety indicators of sugar beet, white sugar, molasses and beet pulp were studied. Microbiological indicators: CGB (coliforms), pathogens and S.aureus were not found in sugar beet samples. Microbiological indicators of QMAFAnM and yeast of white sugar, molasses and pulp 1–5*102, 6–7*102, 5–8*102 and 2–3*101, 1–3*101, 1*101 CFU/cm3, respectively, are within acceptable limits. The content of toxic elements did not exceed the permissible limits.
For Kazakhstan sugar factories, no studies on hazard analysis and critical control points in the sugar industry have been conducted before, so the results of the study will fill this gap.
The scope and conditions for the practical use of the results obtained are the possibilities of raising the quality of finished products and improving the safety of raw materials and finished products, increasing the shelf life of by-products (molasses, beet pulp) of sugar beet production. These opportunities are based on the hazard analysis and critical control points (HACCP) in sugar beet processing
Development of the retrieving technology of carotenoids from pumpkin (Cucurbita SPP.) pulp using Zn-Al layered double hydroxides
Authors: Kovalenko Vadym , Kotok Valerii , Dopira Anton , Carbajal Arizaga Gregorio Guadalupe , Verbitskiy Volodymyr , Medianyk Volodymyr , Berzenina Oksana , Anataichuk Inna
Published: September 2022

A simple mechanical method (grinding and sieving) was proposed to separate the composite into carotenoid-enriched and LDH-enriched materials. The method is based on the internal self-abrasion of the composite when grinding solid particles of LDH as grinding bodies. When removing carotenoids in the form of a composite, rapid precipitation of the sediment and ease of filtration under vacuum were found. X-ray diffraction analysis showed that the composite and products of its separation contain X-ray amorphous Zn-Al LDH, an oxide phase, and an amorphous phase of carotenoids. The method of dichloroethane extraction proved the effectiveness of the composite separation process. It was shown that for the optimal amount of Zn-Al LDH, the content of carotenoids in carotenoid-enriched material was 24.4 %, and in LDH-enriched – 4.4 %. For these conditions, it was found that the total yield of carotenoids was 184.3 mg/100 g of pumpkin pulp, of which 155.4 mg/100 g was in the carotenoid-enriched material and 28.9 mg/100 g was in the LDH-enriched material. A hypothesis was expressed regarding the chemical nature of the interaction of carotenoids and LDH in the composite due to π-d interaction.
The resulting carotenoid-containing materials can be used as food additives or processed to obtain purified carotenoids.
Empirical cumulative distribution function of the characteristic sign of the gas environment during fire
Authors: Pospelov Boris , Andronov Vladimir , Rybka Evgenіy , Bezuhla Yuliia , Liashevska Olena , Butenko Tetiana , Darmofal Eleonora , Hryshko Svitlana , Kozynska Iryna , Bielashov Yurii
Published: September 2022

The object of this study is the dynamics of a characteristic sign of an increment in the state of the gaseous medium in the premises when a thermal source of fire appears. The subject of the study is the type of an empirical cumulative function of the distribution of dynamics of a characteristic sign of an increment in the state of the gaseous medium in the absence and appearance of a thermal source of fire in the premises. As a characteristic feature, the probability of non-recurrence of the increments of the vector of states of the gaseous medium was chosen. The results of the study make it possible to quickly identify thermal sources of fire under uncertain conditions. The methodology for studying the empirical cumulative function of the distribution of the dynamics of the probability of non-recurrence of the increments of the vector of the state of the gas medium has been substantiated. The technique includes the implementation of seven consecutive procedures and makes it possible to explore the specified function for arbitrary time intervals. The empirical cumulative distribution function for two fixed time intervals of equal duration before and after the appearance of test thermal sources of fire in the laboratory chamber was investigated. It was established that the features of the empirical cumulative functions of the distribution of the dynamics of the probability of non-recurrence of the increments of the vector of the state of the gas environment allow for early detection of fire. The main sign of detection is a decrease in the fixed values of the empirical cumulative distribution function. For test thermal sources, fixed values of the empirical cumulative distribution function are in the range of 0.15–0.44. These probabilities are determined by the different ignition rate of the test thermal sources. The research results indicate the possibility of using the identified features of empirical cumulative distribution functions of the dynamics of the probability of non-recurrence of increments of the vector of the state of the gas environment for the early detection of fires
Development of saga (Abrus precatorius) seed extract as a green corrosion inhibitor in API 5l Grade B under 1m HCL solutions
Authors: Riastuti Rini , Setiawidiani Dinar , Soedarsono Johny Wahyuadi , Aribowo Sidhi , Kaban Agus Paul Setiawan
Published: September 2022

The critical role of newly green corrosion inhibitors shows the disruption of cathodic and anodic reactions at the metals and solution interface. The object of this study is the development of Saga as a corrosion inhibitor to mitigate the effect of corrosive HCl 1M оn mild steel. The inhibitor was extracted using methanol to prepare various concentrations. Fourier transform infrared (FTIR) spectroscopy was used to determine the functional group of the inhibitor. The electrochemical impedance spectroscopy aided by the potentiodynamic polarization was utilized to evaluate the inhibitor’s effectiveness. Optical emission spectroscopy (OES) was implemented to determine the percentage of elements in mild steel. Based on the FTIR results, C=O, -OH, C=C, benzene, and C-O are accountable for the inhibitor to donate its lone pair of an electron to the 3-d orbital of iron metal. Increasing the inhibitor concentration decreases the capacitive double layer to elevate the inhibitor resistance. The higher inhibitor resistance of 29.33 Ω cm-1 increases as the concentration increases due to the depression of Cdl 420.16 µF cm2 at 10 ml inhibitor solution. Parallelly, it increases the inhibition efficiency at 65.58 %, slightly lower than the PP measurement of nearly 88 %. The higher value of adsorption/desorption constant, Kads, at 2.9 L mol-1 shows the strength of the inhibitor, which lowers the value of Gibbs free energy (ΔGads). The Saga inhibitor is considered a chemisorption inhibitor ΔGads –36.87 kJ/mol. The value demonstrates the formation of dative covalent bonding, which promotes the transferred electron from the inhibitor to the substrate. On the other hand, the Saga inhibitor abides by the Langmuir adsorption isotherm as the R2 value is 0.99.
Improving the efficiency of condensation installations of steam turbines by applying liquid-vapor ejector
Authors: Sharapov Serhii , Yevtushenko Sviatoslav , Panchenko Vitalii , Kozin Viktor , Ivchenko Oleksandr
Published: September 2022

This paper considers the possibility of using liquid-vapor ejectors in condensing units of steam turbines. This unit is designed for pumping out a steam-air mixture from a steam turbine condenser, in which the process occurs at a pressure lower than atmospheric. In the traditional scheme, this is provided by a two-stage steam-jet ejector unit. The proposed scheme involves the use of a single-stage liquid-vapor ejector and its possible pre-vacuum mode of operation in conjunction with a liquid-ring vacuum pump. A working process of the liquid-vapor ejector does not require the supply of working steam from the outside since its generation occurs in the active nozzle of the liquid-vapor ejector. A description of the traditional scheme and the proposed options is given, which are different both in the scheme solution and in the operating parameters. The object of this study is a liquid-vapor ejector, which is used in the condensing system of a steam turbine. Thermodynamic calculation of the proposed circuit solutions was carried out. As a result, the necessary mode parameters of the schemes were determined. To assess the feasibility of using a liquid-vapor ejector in the condensation systems of steam turbines, an exergy analysis was performed. The proposed scheme makes it possible to increase efficiency by 2.3 times, and when used with a liquid-ring vacuum pump – by 2.44 times. To assess the economic efficiency of the modernization of the condensing system, thermoeconomic analysis was performed. The use of the proposed scheme makes it possible to reduce the cost of generating boiler steam and reduce the cost of the resulting product of the steam turbine unit by about 51 %. The estimated cost of a unit of the amount of boiler steam consumed per ton of product and the unit cost of steam were established.
Evaluation of creep-fatigue life and strength for AA7001-T6 under constant amplitude loading
Authors: Mahdi Huda Salih , Alalkawi Hussain J. , Mohamed Muzher T. , Faris Saad T.
Published: September 2022

Aluminum alloys were widely used in the construction, automotive, marine, and aviation industries due to their low specific strength, ease of manufacture, and low weight. The fatigue behavior of aluminum alloys at different temperatures is investigated. Thanks to the rapid development of armament in recent years, 7XXX ultra-high strength aluminum alloys are now used more frequently because of their non-corrosive qualities and low weight. Aluminum alloy 7001-T6 behavior is examined at the Company State for Engineering, Rehabilitation, and Inspection (SIER) in Iraq, where chemical analysis of the AA7001 is supported. Most engineering components that operate at high temperatures will eventually fail from fatigue strain, creep damage is a time-dependent process that is primarily influenced by the history of stress and temperature applied to the component. When the two damaging factors combine their effects, This study used AA7001-T6 to conduct experiments on mechanical characteristics (UTS, YS, E, and ductility) and the interaction between creep and fatigue at four distinct temperatures: room temperature (25, 150, 280, and 330) °C, the UTS, YS, and E were lowered by 37.2, 37.2, and 24) %, respectively, as compared to the result at room temperature, but the ductility increased by 28.27 %. It has been noted that rising temperatures cause mechanical and fatigue characteristics to decline. Experimental S-N fatigue test findings showed a significant loss of fatigue strength, After 107cycles, the endurance fatigue limit was reduced from 208 MPa at (RT) to 184 MPa at 330 °C, an 11.5 % reduction. Overall, it can be said that AA7001-T6 demonstrates a significant drop in mechanical and fatigue properties at high temperatures
Establishing a dependence of the efficiency of low-pressure reverse osmotic membranes on the level of water mineralization
Authors: Gomelya Mykola , Vakulenko Anna , Makarenko Iryna , Shabliy Tetyana
Published: September 2022

This paper has established the dependence of the effectiveness of the reverse-osmotic low-pressure membranes Filmtec TW30-1812-50 on the initial concentrations of sulfate and sodium chloride in the range of 20–1000 mg/dm3 at the degrees of permeate selection of 1–90 % with the use of pressure of 3.6–10.0 atm. The dynamics of increasing the content of sulfates and chlorides in concentrates with an increase in the degree of permeate selection, selectivity, productivity, and filtration coefficient of the membrane have been determined. The conditions for calculating the membrane performance depending on the working pressure for sodium sulfate and sodium chloride have been defined.
It is shown that the concentrations of sulfates and chlorides in permeates depend on their initial concentration in solutions and increase both with an increase in the initial concentration and with an increase in the degree of permeate selection. The latter factor is quite significant at the initial concentrations of chlorides and sulfates at a concentration of 1000 mg/dm3. The productivity of the membrane increases with a decrease in the salt content in water and decreases as the degree of permeate selection increases, which leads to an increase in the concentration of salts in the premembrane space.
The selectivity of the membrane increases with increasing concentration of sodium sulfate and sodium chloride solutions in solutions, despite a certain increase in salt concentrations in permeates. For solutions of Na2SO4 and NaCl (20–1000 mg/dm3) at their reverse-osmotic desalting on the membrane, the filtration coefficients have constant values. For these initial concentrations, the filtration coefficient for Na2SO4 is 3.4–3.8 dm3/(m2∙atm), and for NaCl – 2.6–3.2 dm3/(m2∙atm). The data reported here allow us to conclude about the permissible level of mineralization, at which it is advisable to use reverse-osmotic low-pressure membranes. It is shown that an increase in the concentration of salts in concentrates leads to an increase in osmotic and working pressures
Establishing the influence of the type of micro- and nanofillers on the thermophysical properties of highly heat conductive polymer composites based on polyamide 6
Authors: Fialko Nataliia , Dinzhos Roman , Sherenkovskii Julii , Meranova Nataliia , Babak Vitalii , Korzhyk Volodymyr , Lazarenko Maxim , Polozenko Nina , Parkhomenko Оlexander , Makhrovskyi Volodymyr
Published: September 2022

The object of this study is the thermophysical properties of polymer micro- and nanocomposites, as well as the dependence of their heat conductivity with structural characteristics when using different types of fillers. A set of experimental studies of heat conductivity and specific heat capacity of polymer micro- and nanocomposite materials for polyamide 6 and carbon nanotubes, copper and aluminum as matrix and fillers was carried out. When obtaining composites, a method was used that is based on the mixing of components in the polymer melt. The content of fillers varied from 0.3 to 10 %, and the temperature of composite materials – from 305 to 500 K.
Experimental dependences of heat conductivity coefficients of the studied composites on the content of the filler were derived. It was established that according to the value of these coefficients in order of their reduction, these composite materials are ranked as follows: composites with fillers with carbon nanotubes, copper, and aluminum. It was found that only one percolation threshold is observed, when using a polyamide 6 matrix.
The regularities of changes in the specific heat capacity of the composites under consideration on their temperature when varying within the above limits of the filler content were investigated.
The analysis of the influence of the content of fillers on the degree of crystallinity of the polymer matrix of the investigated composite materials was carried out. It is shown that with an increase in the content of fillers, the degree of crystallinity decreases. The relationship between the thermally conductive properties of the composites under consideration and the specified degree of crystallinity has been established. Higher values of heat conductivity of composites correspond to lower values of the degree of crystallinity.
The reported results can be widely used in the development of highly heat conductive composites for various engineering applications.
Development of the control system for taking off the maximum power of an autonomous wind plant with a synchronous magnetoelectric generator
Authors: Ostroverkhov Mykola , Chumack Vadim , Kovalenko Mykhailo , Kovalenko Iryna
Published: September 2022

The object of this study is electromechanical processes in an autonomous wind power plant with a magnetoelectrical generator.
Under actual conditions, the wind speed is constantly changing. The wind turbine works as efficiently as possible only at the rated value of wind speed. When the wind speed changes, the efficiency of converting mechanical wind energy into electrical energy decreases. Controlling the power of the electric generator when the wind speed changes is a relevant scientific and technical task.
A maximum power selection control system based on the parameters of an experimental sample of a synchronous magnetoelectric generator has been designed and investigated. A feature of the synthesized control system is that it was developed on the basis of the concept of inverse dynamics problems in combination with minimization of local functionals of instantaneous energy values. The control law provides weak sensitivity to parametric perturbations of the object and carries out dynamic decomposition of the interdependent nonlinear system, which predetermines its practical implementation. Transient processes of the power, voltage, and current of the stator, as well as the voltage and excitation current were established when the wind speed changes from 3 to 8 m/s, as well as when the active electrical resistance of the load changes.
The results of this study confirm the effectiveness of the maximum power take-off control system when wind speed and load change. When the wind speed changes within 3–8 m/s and the load by 50 %, the efficiency of converting mechanical wind energy into electrical energy increases by 15–40 % compared to the traditional magnetoelectric system.
The findings of the current study are recommended for practical use in autonomous power plants based on wind turbines with generators with permanent magnets.
The applicability of informative textural features for the detection of factors negatively influencing the growth of wheat on aerial images
Authors: Yessenova Moldir , Abdikerimova Gulzira , Baitemirova Nurgul , Mukhamedrakhimova Galia , Mukhamedrakhimov Karipola , Sattybaeva Zeinigul , Salgozha Indira , Yerzhanova Akbota
Published: September 2022

Automated processing of aerospace information makes it possible to effectively solve scientific and applied problems in cartography, ecology, oceanology, exploration and development of minerals, agriculture and forestry, and many other areas. At the same time, the main way to extract information is to decipher images, which are the main carrier of information about the area.
Aerospace images are a combination of natural texture regions and man-made objects. This article discusses methods for analyzing texture images. The main tasks of the analysis of texture areas include the selection and formation of features that describe texture differences, the selection and segmentation of texture areas, the classification of texture areas, and the identification of an object by texture. Depending on the features of the texture areas of the images used, segmentation methods based on area analysis can be divided into statistical, structural, fractal, spectral, and combined methods.
The article discusses textural features for the analysis of texture images, and defines informative textural features to identify negative factors for crop growth. To solve the tasks, textural features are used. Much attention is paid to the development of software tools that allow to highlight the features that describe the differences in textures for the segmentation of texture areas. This approach is universal and has great potential on the studied aerospace image to identify objects and boundaries of regions with different properties using clustering based on images of the same surface area taken in different vegetation periods. That is, the question of the applicability of sets of texture features and other parameters for the analysis of experimental data is being investigated.
Determination of optimal technological parameters of obtaining stevia extract in technology of sour dairy desserts
Authors: Belemets Tatiana , Kuzmyk Uliana , Gryshchenko Roman , Osmak Tetiana
Published: September 2022

In order to determine the optimal technological parameters for obtaining stevia leaf sweet extract, the dependence of the extractives' yield on the temperature and extraction process duration was investigated. A mathematical model has been built that makes it possible to determine and predict the extraction process at different technological parameters in order to effectively obtain extractive substances.
The expediency of using whey from the production of fermented milk cheese as an extractant for obtaining stevia extract has been substantiated. It was experimentally established and mathematically confirmed that the use of whey makes it possible to increase the yield of extractives by 12.1 %, as opposed to the use of an aqueous solution.
In order to intensify the extraction process, it is proposed to use a rotary-pulse apparatus. It was found that the application of a rotary-pulse apparatus makes it possible to increase the yield of extractive substances from sweet grass by 0.1–0.4 % compared to maceration.
The optimal technological parameters for obtaining stevia extract have been determined: hydro module, 1:15; extractant, whey; extraction temperature, 85±5 °С; process duration, 20–25 min. The use of graphic and mathematical modeling in the environments "Mathcad" and "Statistica" helped construct 3D-graphic models to illustrate the dependence of the degree of extraction of extractive substances from dry stevia leaves on the technological parameters for obtaining extracts.
The improved technology of obtaining stevia leaf sweet extract will significantly expand the range of "healthy foods" through the partial or complete replacement of sugar. The production of such dietary products will have a social effect and economic attractiveness for food industry enterprises
Automating the customer verification process in a car sharing system based on machine learning methods
Authors: Amirgaliyev Beibut , Yegemberdiyeva Gulzhan , Kuchansky Alexander , Andrashko Yurii , Korol Ihor
Published: September 2022

Convenient and accurate verification of the user of a car sharing system is one of the key components of the successful functioning of the car sharing system as a whole. The machine learning-based KYC (Know your customer) process algorithm makes it possible to improve the accuracy of customer data validation and verification. This makes it possible to eliminate possible losses and reputational losses of the company in case of unforeseen situations while using the client's car sharing services. The object of this study is to find a solution to the problem of user verification in a car sharing system based on the KYC process using deep learning methods with a combination of OCR (Optical Character Recognition) methods.
The statement of the user verification problem in the car sharing system was formalized and the key parameters for the KYC process have been determined. The algorithm of the KYC process was constructed. The algorithm includes six successive stages: separating a face in the photograph, comparing faces, checking documents and their validity period, establishing and recognizing ROI (region of interest), formulating a verification decision. To separate the face in the client's photograph and compare faces, methods based on deep learning, as well as the quick HoG method (Histogram of oriented gradients), were considered and implemented. Verification of these methods on a test dataset, which includes images of documents of two thousand clients, showed that the recognition accuracy was 91 % according to Jaccard's metric. The average time of face separation using the HoG method was 0.2 seconds and when using trained models – 3.3 seconds. Using a combination of ROI and ORC separation methods makes it possible to significantly improve the accuracy of verification. The proposed client verification algorithm is implemented as an API on an ML server and integrated into the car sharing system.
Implementation of business culture for Mexican SMEs versus globalization 4.0
Authors: Sandoval-Gomez Raul Junior , Alvarez-Cedillo Jesus Antonio , Sarabia-Alonso Maria Teresa , Alvarez-Sanchez Teodoro , Perez-Garcia Rebeca , Gonzalez-Vasquez Alexis
Published: September 2022

Businesses carried out worldwide have been influenced by the phenomenon of Globalization 4.0. has allowed us to make various changes in all aspects and activities of the human being in different countries where an essential interdependence of markets was reflected. However, they allow reflection on all economic activities. In the particular case of small and medium-sized enterprises (SMEs), this phenomenon creates an uncertain environment and opens the opportunity to develop a competitive environment and identify challenges and opportunities. Many elements are considered incident factors caused by Globalization 4.0 that affect Mexican SMEs. This work shows what factors affect the economic aspects and how the cultural factor is significant; the challenge of teamwork, cooperation, unity, and management of existing resources is also considered. Although Mexico has an influential business culture, it is not implemented in these companies; some seem unaware of a situation limiting their participation in conducting international business and improving their global competitiveness. This article shows the results of qualitative research based on the grounded theory proposed by Glaser and Strauss in 1967; the results obtained show how it is necessary to develop cultural aspects so that SMEs can achieve development and permanence over time. Globalization 4.0 is a phenomenon that affects international companies and represents actions and strategies to have an advantage over other companies, but what happens with SMEs is different; these types of companies do not have economic resources, and globalization 4.0 becomes a disadvantage. In our study, 80 % of SMEs do not have a business culture and are not prepared for globalization 4.0, and we also found that time is wasted on bad practices in 35 % of Mexican SMEs; training was lacking in 32 % of educational cases.
Synthesis of the control system for the positioning pneumatic drive of shut-off fittings according to the criteria of technological efficiency
Authors: Kryvoplias-Volodina Liudmyla , Gavva Oleksandr , Sukhenko Vladyslav , Myronchuk Valerij , Tokarchuk Serhii , Volodin Oleksandr
Published: September 2022

This paper reports the new design of an experimental bench to study the effectiveness of the positional drive control system of shut-off fittings. For research, the operating modes of the disk flap and ball valve, based on proportional elements with feedback (4–20 mA), were programmatically formed and described.
The mathematical model of control over shut-off devices has been analytically described on the example of a disk rotary valve with the possibility of further analysis of individual stages in accordance with the accepted assumptions. The operating control signal is justified with a serial asynchronous interface with an offset operating range of permissible values of –16.0 mA.
Separate stages in the operation of the synthesized shut-off fittings based on accepted assumptions have been described. Measurements were performed for disc damper angles of 30°, 60°, 90° by variable value of the pressure control signal (1...4 bar) with sampling of measuring indicators for the control system in real time. The results obtained experimentally confirmed the adequacy of numerical modeling regarding the study of the disk rotary inter-flange valve, as well as preliminary assumptions in the mathematical model. Data were obtained to test the efficiency of controlled shut-off fittings (V-shaped ball valve, disc rotary inter-flange valve) at a sugar factory. The average angle of rotation for a ball is 17.61 degrees; the average value of the vapor temperature after cooling is 130.91 °C (subject to a given value of 130.0 °C). The deviation of the set value is 0.7 %. The average value for the angle of rotation of the disc damper at 43.0 degrees showed the largest deviation of technological parameters of 1.45 %.
Effects of rotational speed on the natural frequency of the differential bevel gear
Authors: Hassan Ali Raad
Published: September 2022

With the development of techniques for the use of gears and their many shapes and types, the mechanical need for them has become great, especially in the use of them in the field of cars, and the most important of these types are bevel gears, as these gears are considered essential in differential gears.
The use of differential gears in mechanics in general helps to reduce noise in the movement, but there must be vibration resulting from this movement, and accordingly, bevel gears and the effect of rotating gears on free vibration have been studied.
Variable gears were used according to a simulation program and the study of the free vibrations that occur to them. The effect of rotational speed on the natural vibration greatly affects the transmission of movement in the car and increases the fault distortions that occur in the differential gearbox.
The result shows the natural vibration reached at the speed of 5000 rpm, and the value of the vibration reached 3564.5 Hz, which is the highest value compared to the remaining speed. The distortion at a speed of 1,000 rpm. The process of rotation and natural vibration affects the deformations and stresses that get on the gears themselves. The natural vibration is greatly reduced when the number of clamping places for the differential gear is increased. Compared to the presence of two spinning tires, the vibration value reduced. At a rotating speed of 5000 rpm, it is known that increasing the rotational speed raises the value 3015.9 Hz with one tire revolution with one tire rotation, the huge strains influence the little gears in the differential gearbox. The greatest value of distortion is 0.00067 m at 5000 rpm, which is the largest value of deformation compared to the rest of the employed rotational rates with one tire revolution.
Use of algorithm of the prevention complex of inflammatory processes in the oral cavity in metabolic syndrome
Authors: Kravchenko Lyudmila , Appelhans Olen , Poliakov Anatoliy , Unhurian Liana , Pasechnyk Oleksandr , Rozumenko Mariya , Ivanova Yana , Rozumenko Vladislav
Published: September 2022

The aim of the work was to evaluate in the experiment the effectiveness of the developed treatment-and-prophylactic complex for the prevention of periodontal tissue disorders under metabolic syndrome simulation.
Materials and methods: The study of biochemical and immunological changes in the blood serum, liver and gingival tissue was performed during simulation on the metabolic syndrome of alimentary genesis on Wistar rats, all animals were divided into 5 groups: 1) intact, 2) with simulated metabolic syndrome, 3) in a week after the start of MS simulation 5 times a week in the morning perorally administered a “Capillaroprotect” aqueous solution (bioflavonoid, antioxidant) produced by “Ekosvit Oil” (Ukraine) at a rate of 135 mg/kg, 4) under similar conditions receiving the preparation based on the dihydroquercetin were locally applied on gums a new dental elixir based on bee products and adaptogens of plant origin by o,5 ml/rat with a tampon, which has held for 5–7 minutes, 5) during MS simulation from the second week were used the preparation based on the dihydroquercetin, the dental elixir topically on gums and physiotherapy.
Results: Under conditions of experimental MS simulation with a diet rich in saturated fats and carbohydrate there are systemic disorders in the body: reduced nonspecific antimicrobial protection, increased microbial contamination, intensification of lipid peroxidation, the development of inflammation and hepatotoxicity. Prophylactic administration of the proposed dihydroquercetin preparation to animals in the process of simulation of MS significantly inhibits the established disorders, positively affecting the biochemical parameters of the blood serum, liver tissue, periodontium, reducing triglycerides, total cholesterol, glucose level, restoring the state of non-specific resistance, lipid metabolism, preventing inflammation and hepatosis, as well as contamination with pathogenic microflora.
Conclusion. The proposed treatment-and-prophylactic complex, which includes the dihydroquercetin preparation, used per os in combination with local therapy of periodontal tissues with a tooth elixir based on propolis and biologically active substances of plant origin adaptogens with ultraphonophoresis under induced metabolic syndrome significantly removed the negative effects of its most important components
Monitoring of indicators of physical availibility and socio-economic affordability of metformin hydrochloride medicines
Authors: Ryshchenko Oksana , Lytkin Dmytro , Podolsky Illya , Volkova Alina , Vladymyrova Inna
Published: September 2022

The aim of the study was to monitor the physical availability and socio-economic affordability of metformin hydrochloride medicines, which are used for the treatment of type II diabetes mellitus.
Materials and methods. Medical and technological documentation on the standardization of medical care for patients with type II diabetes, data from the State Register of Medicinal Products of Ukraine, software complex “Apteka” of the company “Morion” and data from the pharmaceutical market research analytical company “Pharmstandard” of the company “Morion” were used as research materials to determine indicators of physical availability and socio-economic affordability of metformin HCL medicines for the treatment of type II diabetes. Documentary, analytical methods, the method of marketing research and the method of logical summarization of data were used during the research.
Results. According to the results of the analysis of the medical and technological documentation on the standardization of medical care for diabetes mellitus (DM) type II and the State Register of Medicines of Ukraine, a number of characteristics were formed for Metformin HCL pharmaceuticals, namely: tablets or film-coated tablets in a dose of 500 mg, which are manufactured: Ukrainian manufacturers (full cycle of production); Ukrainian manufacturers of tablets in bulk (primary and secondary packaging) and foreign manufacturers. The specified characteristics became the basis for the further selection of several metformin HCL medicines in terms of determining their indicators of physical availability and socio-economic affordability. When determining the physical availability of metformin HCL medications, it was established that Ukrainian-made pharmaceuticals (full production cycle) are presented in the wholesale chain of the pharmaceutical market in full. According to the socio-economic indicator of the solvency adequacy of payment capacity, among the metformin HCL pharmaceuticals, the most economically justified are the Ukrainian-made pharmaceuticals, which are made from tablets in bulk according to the full production cycle. Only 1 medicine was singled out among foreign-made ones, which has the lowest indicator of solvency adequacy for various categories of the population.
Conclusions. Monitoring of indicators of physical availability and socio-economic affordability of metformin HCL medicines showed that the most economically justified for able-bodied people and people of retirement age is the use of the Ukrainian-made pharmaceuticals (full cycle and production from tablets in bulk) for the treatment of type II DM)
Analysis of conditions and factors affecting cyber security in the special purpose information and telecommunication system
Authors: Sova Oleg
Published: September 2022

The increase in the number of cases of failure of information and telecommunication networks due to cyber attacks determines the need to protect them from this type of attacks. The issue of increasing cyber security in the conditions of conducting operations by groups of troops (forces) is very important. Due to the armed conflict in the East of Ukraine, the military-political instability in the Middle East, the struggle for influence on world financial and energy flows, the global military-political instability is intensifying. This is due to an increase in the number of communication devices in information and telecommunication networks, as well as an increase in the number of possible attacks that can be used to disrupt the operation of an information and telecommunication network. Considering the above, the object of research is a special purpose information and telecommunication system. The subject of research is cyber security of a special purpose information and telecommunication system. Classical methods of scientific knowledge, namely analysis and synthesis, were used during the research. The research identifies factors that affect cyber security in a special purpose information and telecommunications system. All this must be taken into account while planning and deploying a special purpose information and telecommunication system. The analysis of the consequences of the impact on the information and telecommunications system of special purpose of modern devices of defeat and the impact of devices of radio-electronic suppression and other factors was carried out. A typical special purpose information and telecommunication system does not fully meet the requirements for constant readiness to ensure the management of troops (forces), stability, mobility and throughput. A formalized description of the task of improving cyber security in a special purpose information and telecommunications network is provided. The components that affect the level of cyber security of the special purpose information and telecommunication network during the group's operations have been established. The impact of the specified conditions and factors must be reflected: in the planning documents during the planning of the deployment and operation of the group's information and telecommunications system; in the software, during operational management.