bluuebunny/crossref_metadata_2025 huggingface dataset:
Devising a method for increasing the noise immunity of systems with orthogonal frequency division multiplexing under the conditions of inter-channel interference
Authors: Bykov Rostyslav
Published: September 2023

Modern communication systems are based on orthogonal frequency division multiplexing (OFDM) technology, which allows reliable transmission of information under multipath conditions. The need to preserve the orthogonal properties of subcarriers leads to high sensitivity of these systems to frequency shifts of the signal. The method of signal formation for the OFDM system has been improved in this work. The use of spectrum-selective shaping pulses after the inverse fast Fourier transform (IFFT) stage at the transmitter side to reduce the level of inter-channel interference during carrier frequency shift was investigated. New pulse shapes were synthesized, obtained by using optimized multiparameter functions with a selective spectrum. The effectiveness of the application of synthesized pulses with a selective spectrum in reducing the influence of the frequency shift of the signal on the interference immunity of the OFDM system was analyzed. A comparison of the probability of a bit error with already existing forms of Nyquist pulses was carried out. In the MATLAB environment, a model of the transmitter and receiver of the OFDM system was developed for the experimental assessment of the influence of the proposed forming pulses on the immunity of the system under the conditions of inter-channel interference with different types of modulation. It was established that the lowest level of bit error probability under the conditions of inter-channel interference was observed for a two-parameter pulse with a selective spectrum and a piecewise linear approximation of the transition region. So, for a signal-to-noise ratio of 15 dB, BPSK modulation and a normalized frequency shift of 0.2, the probability of a bit error for a given pulse is 3∙10-4; for QPSK modulation and a normalized frequency shift of 0.1, 10-6; for QAM-16 modulation and a normalized frequency shift of 0.03, 2∙10-4
Identification of influence of digital twin technologies on production systems: a return on investment-based approach
Authors: Banyai Kristof , Kovacs Laszlo
Published: September 2023

The object of this study is the impact of different digital twin solutions on the performance of job-shop manufacturing systems, while economic aspects are also taken into consideration. This paper proposes an approach to analyze the impact of different identification systems on the efficiency and ROI of digital twin deployment in production systems. In order to achieve this aim, let’s analyze the investment and operation cost of different Internet of Things technologies. The next phase of the research work was the definition of performance parameters, which makes it possible to analyze the impact of different digital twin solutions on the productivity of the job-shop manufacturing system. It is possible to choose four financial indicators to analyze the economic impact of digital twin solution on job-shop manufacturing: return on investment, compound annual growth rate, internal rate of return and net present value. Our approach is based on a novel agent-based simulation model using AnyLogic simulation tool. From the results of this productivity analyses, the model computes the financial indicators, which describe the expected financial impact of the investment and operation cost. It is compared the impact of barcodes and radiofrequency identification technologies on the financial and technological impact of the job-shop manufacturing environment. The numerical analysis of a job-shop manufacturing system shows, that the radiofrequency identification-based digital twin solution has 9.2 % higher return on investment, 53 % higher net present value and 1.6 % higher compound annual growth rate. The model can be easily converted to analyze other types of manufacturing systems, which can lead to increased efficiency of digital twin solutions
Development of a solution search method using an improved fish school algorithm
Authors: Tarkhan Aqeel Bahr , Zhuravskyi Yurii , Shyshatskyi Andrii , Pluhina Tetiana , Dudnyk Volodymyr , Kiris Ihor , Nalapko Oleksii , Protas Nadiia , Neronov Serhii , Nechyporuk Vitaliy
Published: September 2023

The object of research is decision support systems. The subject of research is the decision-making process in management problems using the fish school (FSH) algorithm, an advanced genetic algorithm and evolving artificial neural networks.
A solution search method using an improved FSH algorithm is proposed. The study is based on the FSH algorithm for finding a solution on the object state. For training FSH, evolving artificial neural networks are used. The method has the following sequence of actions:
– input of initial data;
– processing of initial data taking into account the degree of uncertainty;
– checking the fitness function of the solution found;
– procedure of feeding fish agents (FA);
– instinctive-collective FA swimming;
– calculation of the center of school gravity;
– collective voluntary FA swimming;
– changing the FA swimming parameters;
– training of FA knowledge bases.
The originality of the proposed method lies in the arrangement of FA taking into account the uncertainty of the initial data, improved global and local search procedures taking into account the degree of noise of data about the state of the analysis object. The peculiarity of the proposed method is the use of an improved FA training procedure. The training procedure consists in learning the synaptic weights of the artificial neural network, the type and parameters of the membership function, the architecture of individual elements and the architecture of the artificial neural network as a whole. The use of the method makes it possible to increase the efficiency of data processing at the level of 18–25 % due to the use of additional improved procedures. The proposed method should be used to solve the problems of evaluating complex and dynamic processes in the interest of solving national security problems
Identification of the nature of defects arising in the production of continuously cast pipe billets for the oil and gas industry
Authors: Mammadov Arif , Babaev Agil , Ismailov Nizami , Huseinov Mukhtar , Guliyev Faiq
Published: September 2023

The paper presents the results of studies of defects that occur in the production of continuously cast pipe blanks for the oil and gas industry. It is shown that the use of the technology of continuous casting of pipe billets in comparison with the traditional methods of pouring liquid steel into a mold has a number of advantages, among which is the high productivity of the technological process. However, it was noted that in many cases, an abnormally high degree of contamination with non-metallic inclusions is observed in the structure of the steel of continuously cast pipe billets.
It was revealed that the largest inclusions are oxides of silicon and manganese. On the surface of the pipes, there are defects in the form of oxide spots, near which there are large non-metallic inclusions. On the surface of the oxide spot, the presence of iron oxides in the form of scale is found, which is a consequence of the secondary oxidation of the metal by air oxygen.
A mechanism for the development of oxide spots and decarburized strips in pipe billets has been determined, which consists in the formation of defects in the form of scratches and cracks on the surface before rolling. These defects during heating for rolling lead to the oxidation of the metal and the formation of scale on the surface of the pipe blanks. The results of experimental studies on the development of recommendations for improving the quality of the initial metal of seamless pipes for the oil and gas industry are presented. The study of the microstructure of steel and the assessment of its contamination with non-metallic inclusions were carried out on optical and electron microscopes, and the mechanical properties of pipe blanks were studied by standard methods
Determining the effect of anti-friction additive on the power of mechanical losses in a rotary piston engine
Authors: Mytrofanov Oleksandr , Proskurin Arkadii , Poznanskyi Andrii , Zivenko Oleksii
Published: September 2023

Experimental studies of the effect of adding the antifriction additive Multi-Tech-Conditioner to lubricating oil on the power of mechanical losses of a rotary piston engine were carried out, the purpose of which was to reduce the cost of potential energy of a compressed working fluid to overcome friction forces. The experimental data obtained make it possible to estimate the value of irretrievable losses of the available power of a rotary piston engine at the stage of its design and operation.
Experimentally, a positive effect of the addition of the Multi-Tech-Conditioner antifriction additive to lubricating oil on the change in the power of mechanical losses of the engine was established, which was reflected in a decrease in total losses over the entire operational range of change in the rotor speed by 11.8 %. As a result of the research, it was determined that the losses for pumping strokes (gas exchange) in a rotary piston engine amount to 31.6 % of the total power of mechanical losses.
An assessment was made of change in the mechanical efficiency of a rotary piston engine with a hinged-cam mechanism for converting motion under the conditions of applying an antifriction additive to lubricating oil. It has been established that the addition of the Multi-Tech-Conditioner additive to the lubricating oil in a ratio of 1:14 makes it possible to increase the mechanical efficiency of a rotary piston engine depending on the speed by 3.8–5.5 % for all operating pressures in the inlet receiver.
Based on the generalization and systematization of the obtained experimental data on the use of the Multi-Tech-Conditioner additive, the most rational operating ranges of a new design rotary piston engine were identified. The maximum mechanical efficiency of a rotary piston engine is achieved in the load range of 65...75 % of the rated power, and the speed range is 63...70 %
Design of the parametric appearance of the power plant for modifications of the regional passenger aircraft An-158
Authors: Loginov Vasyl , Ukrainets Yevgen , Humennyi Andrii , Yelans'ky Olexandr , Konyshev Dmytro , Spirkin Yevhen , Bezdielnyi Vitalii
Published: September 2023

The object of research is the process of remotorization of a regional passenger aircraft to increase its fuel efficiency. Based on the conceptual requirements for the remotorization of the An-158 aircraft with turbojet bypass engines, a parametric appearance of three modifications of this aircraft with turboprop engines for 80, 100, and 120 passenger seats was formed. The study was carried out on the basis of the well-known modular software systems «Integration 2.1» and «Air propeller 2.2» for typical flight profiles of the An-158 aircraft. Improved procedures of weight design and determination of the takeoff characteristics of aircraft with different types of power plant engines have made it possible to identify the most advantageous flight speeds of aircraft modifications with a turboprop engine corresponding to different flight masses. The results of the study of flight performance for optimal and «non-optimal» modifications of the aircraft are reported. The parametric appearance of the propeller was formed, the shape of the propeller blade for the cruising flight mode was determined for modifying the aircraft with a maximum number of passengers – 120 people. It is shown that the propeller for this modification of the aircraft cannot have less than 8 blades since with a smaller number of blades, the maximum chord of the propeller blade increases. The inductive power costs increase significantly due to the small elongation of the blades and, as a result, the flight efficiency of the propeller decreases. It is shown that the total fuel consumption for the entire typical flight of all modifications of the aircraft with turboprop engine at all studied flight speeds is less than the total fuel consumption of the An-158 base aircraft
Preparation of wells using an electrohydraulic drill and modeling of heat transfer processes in heat transfer elements of a heat pump
Authors: Akhmadiyev Bektursin , Zhetimekova Gaukhar , Duisenbayeva Мoldir , Sharzadin Adilzada , Nussupbekov Bekbolat
Published: September 2023

The article discusses the use of innovative electrohydraulic technology in the preparation of vertical ground heat exchangers to create heat supply using heat pumps. The discharge energy in the operating range varied E=900÷2600 J. The most economical mode of operation of the electrohydraulic installation is carried out with the following parameters: discharge voltage 30÷51 kV, capacitor bank capacity 2 µF and interelectrode distance 8÷15 mm. It is determined that the optimal energy of destruction of natural materials depends on their thickness. Based on the research, the limits of the electrophysical parameters of the approach were established, at which the concentrated destruction of hard rocks – the main stones ‒ begins. The effective amount of energy for the destruction of stones with a thickness of 53 mm is 900 J. For stones with a thickness of 78 mm, there should be 2600 J. If to increase the energy of the discharges to 1837 J, the process of complete destruction of the stones is underway. Using an electro hydraulic drill, we have prepared vertical wells up to 25 m deep.
In the future, we have installed special temperature sensors along the length of the pipes, inside the well. Using a software product (Temp Keeper), data from temperature sensors are received in real time. This program allows to visually monitor temperature changes occurring at a local point. Temperature and time dependences are also obtained at coolant velocities of 0.2÷0.4 m/s. A significant decrease in the temperature in the well and at the outlet was observed at a coolant velocity of 0.35 m/s for one hour. The study conducted on the basis of the data obtained enables to achieve higher optimal drilling performance compared to conventional installations
Justification of the innovative design of the skip winch with a body moved by a counterweight gravity drive
Authors: Kaiym Talgat , Chsherbinin Yevgeniy , Kaimov Suleimen , Kaimov Aidarkhan , Kaimov Abylay , Bakhyieva Kalimagul
Published: September 2023

The article has to grapple with the problem of creating an economically efficient and environmentally friendly technological process for a development of solid minerals in open-pit mining. In many mining countries of the world today, the depth of many open pits is already 400–600 m or more. At the same time, the cost of transporting 1 ton of rock mass when operating a quarry whose depth is 400 m is 65–70 % of the total cost of extracting 1 ton of minerals.
The object of research is technical devices for transport of rock masses in the technological process of development of solid useful deposits in open pit mining.
The main reasons are the need to construct transport routes for them by withdrawing the sections of the rock mass on above them, as well their lifting capacity is limited because of they all do use highly energy-intensive machines for transporting rock minerals. In article has been justified a skip cable winch supplied with a wheels moving along on a railroad way by using only a gravitational counterweight device for transporting rock mass from a place of their formation to Earth surface. There have been created a prototype of a planar skip winch with four cables for practical implement in open-pit mining. The theoretical and experimental investigations of the prototype have being confirmed its performance. The created skip winch will accomplish its performancing without using any energy machines even under adverse climate conditions. Its affected would allow to make an open-pit effectiveness to soar and environmentally do friendly because of there are all but excluded any transport vehicles whether on gasoline or diesel oil
The development of solution search method using improved jumping frog algorithm
Authors: Mamoori Ghadeer Al , Sova Oleg , Zhuk Oleksandr , Repilo Iurii , Melnyk Borys , Sus Sviatoslav , Bondarchuk Mariia , Kashkevich Svitlana , Moroz Mykola , Klyuchak Oksana
Published: September 2023

The object of research is the decision making support systems. The subject of the research is the decision making process in management tasks using an advanced jumping frog algorithm (JFA), an advanced genetic algorithm and evolving artificial neural networks. A method of finding solutions with the use of improved JFA is proposed. The research is based on the JFA to find a solution regarding the object state. Evolving artificial neural networks are used to train frog agents (FA). The method has the following sequence of actions:
– an input of initial data;
– processing of initial data taking into account the degree of uncertainty;
– calculation of the value of the criterion of optimality of each permutation from the initial FA population
– global search of FA;
– an improvement of the FA position in the search space;
– a regulation of the speed of vehicle movement.
– an improvement of the working conditions of JFA;
– the FA rearrangement;
– an unification of all memplexes into one group;
– the verification of the fulfillment of the conditions of JFA operation;
– the search for the best FA;
– training of the FA knowledge bases.
The originality of the proposed method consists in the arrangement of the FA taking into account the uncertainty of the initial data, the improved procedures of global and local edge taking into account the degree of data noise about the analysis object state, the adjustment of the degree of data noise during the FA movement, the adjustment of the speed of the FA movement.
Also, the peculiarity of the proposed method is the use of an improved procedure for FA training. The use of the method makes it possible to increase the efficiency of data processing at the level of 14–18 % due to the use of additional improved procedures. The proposed method should be used to solve the problems of evaluating complex and dynamic processes in the interests of solving national security problems
An improvement of the method for assessing the efficiency of the methods of performing tasks by the naval forces in the conditions of hybrid operations
Authors: Vdovytskyi Yevhenii , Yakymiak Stepan
Published: September 2023

The object of the research is the use of forces (troops) of the Naval Forces (Navy). The subject of the research is the process of evaluating the effectiveness of the use of Navy in various ways. An improved method for assessing the effectiveness of the ways of performing tasks by the forces (troops) of the Navy during the performance of the tasks of protecting the economic activity of the state at sea in the conditions of the enemy’s hybrid actions is proposed. The method has the following sequence of actions:
‒ an input of initial data;
‒ calculation of the probability of a timely response to enemy actions;
‒ calculation of the probability of the enemy’s refusal to act;
‒ calculation of the probability of ensuring the protection of objects conducting economic activity of the state at sea;
‒ calculation of the mathematical expectation of the number of objects that conduct economic activity at sea and will be protected by the Naval forces (troops);
‒ calculation of the protection degree of objects conducting economic activity at sea;
‒ calculation of the degree of decrease in the carrying capacity of ships (for tasks related to sea transportation);
‒ calculation of the mathematical expectation of the avoided loss of economic activity;
‒ determination of the protection degree of economic activity;
‒ determination of costs of material and technical resources;
‒ choosing the best (rational) way of using the Naval forces (troops) in accordance with the chosen criterion.
The novelty of the method consists in the use of an improved system of indicators for evaluating the effectiveness of the Navy’s methods of performing tasks, taking into account the dependence of the amount of mediated damage caused by sea transportation on the actions of the enemy and taking into account the effect of the Navy’s demonstration actions and the use of simulation tools on the effectiveness of task performance. The considered example showed a 25–40 % increase in assessment accuracy due to the consideration of additional conditions and factors
Development of the concept of building a corporate standard of portfolio management in the course of territory restoration planning in the context of Making-City project
Authors: Teslia Iurii , Yehorchenkova Nataliia , Yehorchenkov Oleksii , Khlevna Iulia , Kataieva Yevheniia , Jamečný Ľubomír , Khlevnyi Andrii , Latysheva Tatiana , Veretelnyk Vitalii , Ohirko Ihor
Published: September 2023

It is shown that at the current stage, there is an important issue of creating portfolio management standards that could be successfully used for the post-war reconstruction of the territory of Ukraine.
The object of research in this work is the process of restoration of the territory of Ukraine. The problem to be solved is the development of principles, processes, functions and models that underlie the portfolio management standard for territory restoration.
Specific features of territory restoration projects are formulated. An analysis of existing approaches to the management of territory restoration in Ukraine, as well as to portfolio management standards, was performed. The experience of the Making-City project was taken as a basis. It is shown that for such complex projects distributed in time and territory, there is no scientific basis for building portfolio management standards.
Based on the selected features of territory restoration projects, the principles and approach to building a corporate standard of portfolio management are formulated. It is proposed to include 9 portfolio management processes of territory restoration projects in the portfolio management standard. To implement these processes, the functions of managing portfolios of projects and programs have been allocated, the regulation of which should be included in the standard of portfolio management of territory restoration.
Previous use of the portfolio management standard for development projects has shown that such a standard can be used for reconstruction projects of the territory of Ukraine in the post-war period.
The developed principles, processes, functions and models of their implementation can be used to solve extreme tasks for the restoration of the territory of Ukraine
Patterns of the state-legal support to the dynamic information development of the socio-economic environment
Authors: Prokhorova Viktoriia , Chobitok Viktoriia , Pershyna Kateryna , Miahkykh Iryna , Shelest Oleksii , Yukhman Yaryna
Published: September 2023

The object of research is the process of state-legal provision of dynamic informational development of the socio-economic environment. It was determined that under modern conditions, the state-legal provision of dynamic informational development of the socio-economic environment consists in creating favorable conditions for the institutions of civil society. This should be implemented by the state in the form of authorized state authorities using a set of methods and means, as well as indirect influence through other socially important institutions, taking into account the development of scientific and technical progress. It is necessary to emphasize the economic, social, and legal criteria of society, which together form an effective basis for the development of the state. These criteria include economic and social freedom, which is possible only in a society with a market economy, where there is the right to choose any form of ownership and types of entrepreneurial activity, within the limits of legislation. Social criteria include self-governance and initiative of members of society; openness, i.e., free access to all sources of information.
The indicators of the dynamic range of the employed people in all types of economic activity in Ukraine, the number of the employed people aged 15–70 by professional groups, and the indicators of the dynamic range of innovation costs were analyzed. Using Mann-Whitney U-test calculations, as well as Spearman's rank correlation coefficient, established that the rank correlation coefficient is statistically not significant and the rank correlation between the scores of the two tests is insignificant.
Based on the results of the research, a map of the state-legal provision of dynamic information development of the socio-economic environment is proposed
Design of various operating devices for sorting binary data
Authors: Hryha Volodymyr , Dzundza Bogdan , Melnychuk Stepan , Manuliak Iryna , Terletsky Andrii , Deichakivskyi Mykhailo
Published: September 2023

The object of research is the process of designing hardware devices for sorting arrays of binary data using the methodology of space-time graphs.
The main task that is solved in the work is the development and research of multi-cycle operating devices for sorting binary data in order to choose the optimal structure with predetermined technical characteristics for solving the sorting problem. As an example, the development of different types of structures of multi-cycle operating sorting devices by the method of «even-odd» permutation is shown and their system characteristics are determined.
New structures of multi-cycle operating devices have been designed for a given sorting algorithm, and analytical expressions for calculating equipment costs and their performance have been given. A comparative analysis of the hardware and time complexity of the developed structures of devices for sorting binary numbers of various types with known implementations of algorithmic and pipeline operating devices was carried out. As a result, the proposed structures, when sorting large arrays of binary data (N>128), have an order of magnitude less hardware complexity due to sequential execution of the same type of operations. The time complexity of multi-cycle operating devices of combined and sequential types with large values of input data is 2.3 and 3.4 times less than that of known pipeline operating devices.
A feature of the research results is the possibility of finding the optimal ratio between the hardware and time characteristics of the resulting structures of sorting devices. Owing to this, the designer will be able to choose the necessary type of device for the implementation of the corresponding task with optimal system characteristics.
The field of application of the designed sorting devices is the tasks of digital processing of signals and images. The practical use of the developed sorting devices can be carried out in the form of their synthesis on software integrated logic circuits
Research of high-frequency remagnetization model in laminated magnetic cores of electromechanical and electromagnetic energy converters
Authors: Kovalenko Mykhailo , Chumack Vadim , Tymoshchuk Oksana , Kovalenko Mykhailo , Bazenov Volodymyr , Ihnatiuk Yevhen , Stulishenko Andrii
Published: September 2023

The object of research in the work is charged magnetic conductors of electric machines and transformers.
Laminated magnetic wire together with windings are important active parts of electric machines that participate in electromechanical energy conversion.
The reliability of the entire machine is mainly determined by the actual condition of the inter-sheet insulation. Violation of the insulation causes parasitic eddy current circuits, which increases the specific losses, and also significantly affects the additional heating of the magnet wire and winding.
The normative method for determining the quality of the charged core is the assessment of specific losses at a frequency of 50 Hz and an induction of 1 T, which should not exceed 2.5–4 W/kg. To determine local damage to the core, methods of local heating and fixation of overheating sites are used, which should not exceed 45 °C compared to the main part of the magnetic core.
In the work, a two-dimensional field mathematical model of a charged magnetic circuit is developed. This makes it possible to carry out electromagnetic calculations in a near-real magnetic conductor, taking into account the variability of magnetic permeability, hysteresis, and the interaction of currents in adjacent plates of the magnetic conductor with each other, the so-called "proximity effect".
On the basis of the developed models, graphs of current distribution and distribution of magnetic induction in one, two and three sheets were obtained. The resulting graphs show how the effect of current displacement increases with increasing frequency, where at a frequency of 100 kHz the magnetic induction density in the middle of the sheet goes to zero. The results of the research confirm the correctness of the model development in comparison with the classical calculation models also given, which allows them to be used for further research of high-frequency processes in charged magnetic circuits of electric machines
Devising a method for rapid data retrieval using explorers for blockchain analysis
Authors: Dorogyy Yaroslaw , Kolisnichenko Vadym
Published: September 2023

The object of this study is blockchain explorers and their usefulness in efficiently gathering data for blockchain network analysis. The process of blockchain analysis typically involves deploying and synchronizing a blockchain node, which requires significant computational resources and time for synchronization. Analyzing multiple blockchain networks simultaneously demands substantial effort and requires even greater costs.
The developed method involves utilizing publicly accessible blockchain explorers, which allows for rapid data retrieval with minimal computational resources for further analysis. Additionally, obtaining supplementary information from blockchain explorers provides valuable details that may be inaccessible using traditional data retrieval methods.
The efficiency of the proposed method was verified through the development of a prototype system. Data was collected for 14 specified blockchain networks to analyze smart contracts within these networks. Information about accounts (including balance statistics) was gathered, smart contracts were identified among the accounts, data on existing tokens owned by smart contracts was obtained, and bytecode and source code (where available) of contracts were collected and decompiled. The process took nearly 24 hours on a cloud computing machine with minimal configuration.
Based on the collected data, an example smart contract was analyzed to demonstrate the completeness of the process. The results of this research minimize computational resource expenses and allow for a simplified and rapid data gathering process without manual configuration, enabling researchers and analysts to concentrate on subsequent stages of analysis
Convergence of educational technologies as an imperative for the development of innovation cooperation in the context of circular transformation
Authors: Prokhorova Viktoriia , Mushnykova Svitlana , Kovalenko Denys , Koleshchuk Orest , Babichev Anatoliy
Published: September 2023

The object of the study is the process of convergence of educational technologies as an imperative for the development of innovative cooperation under the conditions of circular transformation. The central element of circular transformations is a person who must quickly react and adapt to changes in the external environment and solve management problems through systematic professional growth. This can be achieved thanks to the introduction of high-quality modern educational technologies, which require both special knowledge of the theory and practice of management, as well as personal development qualities.
To achieve a state of sustainable development, managers making management decisions must quickly respond and adapt to changes in the external environment to solve various management problems. This requires systematic professional growth through the transition to high-quality new educational technologies.
Combining the principles of global cooperation, defining the key imperatives of sustainable development and finding innovative measures of cooperation under the renewed conditions of the circular economy must be based on education.
The main generally accepted indicator of the level of development of any country in the world is GDP. But under conditions of uncertainty and change, the real state of development and progress can be determined using the Genuine Progress Indicator (GPI), which is an integral indicator.
One of the main issues is the determination of the level of sustainable development in the context of circular transformations, taking into account the influence of the level of education and existing approaches to its assessment. If we take into account that the conditions for cyclical transformations must occur, including through raising the level of education and the constant transfer of education into practice, then the inclusion of the Index of the level of education is necessary to calculate the real state of development of any country
Comparison of chemical composition and wear of iron and nickel aluminide coatings applied by plasma spraying
Authors: Smirnov Igor , Chornyi Andrii , Lysak Volodymyr , Dolgov Nikolay , Sіеliverstov Ihor , Parshenko Kostiantyn
Published: September 2023

Given such properties as wear resistance, corrosion resistance, heat resistance, contact and cyclic strength, iron and nickel aluminides can be used as coatings in friction pairs for various purposes. The object of research is the process of obtaining plasma-sprayed coatings from powders based on iron and nickel aluminides. The task of research is the determination and comparison of the structure, chemical composition, and wear resistance of coatings from powders of iron aluminide and nickel aluminide, obtained by the method of atmospheric plasma spraying. To reduce the oxidation of powders during spraying, the conditions for generating a laminar plasma jet were created. Such conditions were provided by the specially developed structure of the electric arc plasma gun and the operating parameters of coating spraying. As a result of the correct choice of spraying modes, completely melted splats were formed during the collision of powder particles with the surface. The resulting coatings had a layered microstructure with microcracks and peeling. The porosity and characteristics of the delamination of the coatings depend on both the modes and the spraying technology. Tribological tests of the coatings were carried out under conditions of dry metal-on-metal sliding friction in a pair with high-speed steel. It is shown that the wear of nickel aluminide coatings under these conditions is 2–2.5 times lower than that of iron aluminide coatings. The coefficient of friction of iron aluminide coatings is slightly lower than that of nickel aluminide coatings. The wear of samples made of 30CrMnSi steel is 3–4 times higher than samples with coatings. The difference in the wear of the coatings is explained by the more intense oxidation of iron aluminide in the friction process. Conclusions were drawn regarding the possibility of using the investigated coatings in various friction pairs of structural elements, in particular in the automotive industry
Sausage technology for food sustainability: recipe, color, nutrition, structure
Authors: Liu Yan , Helikh Anna , Filon Andrii , Duan Zhenhua
Published: September 2023

Food sustainability is a new concept of sustainability, which is complemented by the criteria of culture, eating traditions and food availability. However, the technology of sausage products was not created for the criteria of food sustainability. Technology was developed using dietary, local, seasonal and economically available semi-finished products with a long shelf life, which is a component of food sustainability, public health and zero hunger. Dried semi-finished products from beets and snails are used as a food coloring, a source of nitrites, complete protein, unsaturated fatty acids and minerals. Research shows the technology of red sausages, which is based on white sausages in Poland (Biała kiełbasa) and Germany (Weißwurst) and its analysis in terms of food sustainability. Dried beetroot was added to recipe in amount of 0 % (B0), 0.5 % (B1), 1.0 % (B2), 1.5 % (B3), 2.0 % (B4) and 2.5 % (B5) to chicken fillet. Pork rind is replaced in recipe with snail powder 0 % (B0), 15 % (B1), 30 % (B2), 45 % (B3), 60 % (B4) and 75 % (B5). Color of red sausages for B3 was best combined with Ukrainian cuisine. Texture profile analysis for B3 had similar values to B0 for chewiness at 306.6. Overall acceptability of B3 was higher than B0 by 8.92 % and amounted to 8.67. Physicochemical indicators for B3, such as pH 5.81, peroxide value 0.248 g/100 g and thiobarbituric acid reactive substances 0.667 mg/100 g were better than B0. For B3 moisture content was 57.81 %, protein 15.72 %, ash 3.36 % and fat 3.40 %. This research is development of method for production of other food products to meet the criteria of food sustainability. Red sausages can be used for food in households, restaurants, fairs and festivals
Procedure for the structural synthesis of the logistic support system to the air force grouping of the armed forces of Ukraine in preparation for combat operations
Authors: Gurin Alexander , Musienko Oleksandr , Khomik Mykola , Vavilova Nadiia , Hurin Ihor
Published: September 2023

This paper considers elements of the methodology for the structural synthesis of the logistic support system of the Air Force grouping of the Armed Forces of Ukraine during the preparation for combat operations. Contradictions between the growing need for military units in material and technical means and the limited capabilities of the existing system of logistical support of the troop group predetermined the relevance and practical focus of this study.
Measures have been devised that affect the logistical support of the troop group. It is proposed to implement a mixed centralized-decentralized principle of building a logistics support system based on «material support clusters», which could ensure timely and complete delivery of material and technical means.
During the research, it was established that reducing the response time to changes in the volume of supplies of material and technical means in military units would ensure the continuity of the operation of weapons and military equipment, and this would give signs of the adaptability of the proposed logistics support system. It is theoretically justified that the use of the proposed methodology could affect the actual availability of established military reserves of the troop group and obstacles that prevent timely replenishment of daily expenses and losses. The remoteness of military units and separate units from provision agencies and the limited means of transporting material and technical means were taken into account. The calculations of the efficiency assessment of the developed structure of the logistic support system allow us to draw conclusions about its superiority over the existing one by 14–17 % by ensuring the continuity of combat operations.
The idea and elements of the devised methodology could be used in the calculations of transport tasks of civil enterprises
Development of a mathematical model for assessing the quality of service on a packet switching subnet
Authors: Mukasheva Roza , Rakhmetullina Zhenisgul , Uvaliyeva Indira , Mukhamedova Raushan , Amenova Farida
Published: September 2023

Currently, data traffic is growing rapidly, and ensuring optimal network performance and effective data flow management have become the most important tasks. In this context, the quality of network service plays a crucial role in achieving these goals.
This article suggests an approach to solving the problem of efficient service in ISDN. Namely, optimization of resource distribution between channel switching and packet switching subnets in ISDN to calculate optimal quality of service characteristics.
In the process of ISDN design analysis, an optimization problem is compiled, where the evaluation of the packet-switched subnet service is used as an objective function, and the evaluation of the circuit-switched subnet service is used as one of the constraints for this task. To calculate the main characteristics of a packet-switched subnet, the subnet is considered as a service system with a delay.
During the study, the methods of optimal movement of the generalized channel boundary between the subnets of channel switching and packet switching were identified, depending on the data parameters and the state of the integrated network, which made it possible to develop an optimal mathematical model of optimal control of the generalized boundary. To calculate the bandwidth for channel switching and packet switching subnets, an algorithm has been compiled to implement the resulting model and a program in C++ has been compiled.
The study of the generalized boundary and the dynamic redistribution of bandwidth between subnets represents a new approach to network optimization.
The results are based on the use of the classical Erlang formula for systems with service failures and on load distribution plans, which makes it possible to effectively manage the maintenance process in the network
Implementation of accounting information systems and information technology (IT) in the sustainability of the developed economic units
Authors: Zwaid Jasim Gshayyish , Kareem Hayder Basim , Abed Rajaa Ali , Fatima Kies
Published: September 2023

This paper focuses on the implementation of accounting information systems (AIS) and information technology (IT) in the sustainability of developed economic units. The objectives of this study are to characterize economic units, study the application of AIS, explain the effectiveness of AIS and IT on economic units, and investigate the role of IT specialists. To achieve these objectives, a comprehensive analysis is conducted to understand the nature, structure, and operations of developed economic units. The study explores how AIS are implemented and utilized within these units, examining the processes, procedures, and technologies involved in collecting, storing, processing, and reporting financial and non-financial data. Additionally, the impact and effectiveness of AIS and IT on the overall performance and sustainability of economic units are assessed, highlighting the benefits and challenges associated with their adoption and integration. The results obtained demonstrate the positive impact of effective AIS and IT implementation on economic unit performance, including improved decision-making capabilities, streamlined operations, and enhanced financial reporting. However, limitations such as sample size and data reliability should be acknowledged. To overcome these limitations, future research should consider larger and more diverse datasets, longitudinal studies, and the involvement of multiple stakeholders. In conclusion, this research provides valuable insights into the implementation of AIS and IT in developed economic units and highlights their significance in ensuring sustainability. The findings can inform decision-makers and practitioners in optimizing the utilization of AIS and IT
Improving the accuracy of identifying objects in digital frames of one series through the procedure of preliminary identification of measurements
Authors: Khlamov Sergii , Savanevych Vadym , Vlasenko Vladimir , Trunova Tetiana , Troianskyi Volodymyr , Shvedun Viktoriya , Tabakova Iryna
Published: September 2023

The object of this study is images of various objects of the Solar System on a series of digital frames. The variety and quality of shooting conditions make it difficult to identify a frame with the corresponding part of the sky. This fact significantly reduces the quality indicators of detection and estimation of the position of objects of the Solar System using already known computational methods and international astronomical astrometric and photometric catalogs. To solve this problem, a procedure for preliminary identification of measurements of digital frames of one series was devised.
This procedure is based on the determination of the shift parameters between the dimensions of a frame and the forms of a catalog or another frame. Also, taking into account the possibility of forming false measurements has made it possible to increase the accuracy of identification and resistance to various kinds of destabilizing factors. Based on this, the final estimation of the shift parameters between frames was performed. Due to these features, the use of the devised preliminary identification procedure makes it possible to improve identification with reference astronomical objects and reduce the number of false detections. The study showed that when identifying frames, the fitting gives the best accuracy of binding to the starry sky. Also, the standard deviation of frame identification errors in this case is 7–10 times less than without using the devised procedure.
The procedure developed for preliminary identification of measurements of digital frames of one series was tested in practice within the framework of the CoLiTec project. It has been incorporated into the Lemur software for automated detection of new and tracking of known objects. Owing to the use of the Lemur software and the proposed procedure implemented in it, more than 700,000 measurements of various astronomical objects under study were successfully identified
Determining the efficiency of installing fixed solar photovoltaic modules and modules with different tracking options
Authors: Golub Gennadii , Tsyvenkova Nataliya , Yaremenko Oksana , Marus Oleh , Omarov Ivan , Нolubenko Anna
Published: September 2023

The object of this study is photovoltaic modules in various installation options. The physical model of the Earth's illumination by a parallel flow of solar rays has been refined. The dependence of the cosine of the angle of incidence of the Sun's rays on the angular length of the day, as well as the average annual efficiency of the installation of photovoltaic modules, both fixed and with various tracking options, was determined. Refinement of the physical model implies determining the angle of inclination as the angle between the inclined axis of the Earth and its projection on a vertical plane, perpendicular to the line connecting the centers of the Earth and the Sun. This line passes through the center of the Earth. The concept of the average annual efficiency of the installation of photovoltaic modules is introduced as the annual weighted average value of the cosine of the angle of incidence of solar rays on the plane of the photovoltaic module. Various options for installing photovoltaic modules were analyzed: fixed horizontal on the equator; stationary, installed at an angle to the horizon; one that performs tracking in horizontal (vertical) planes; with full tracking. The efficiency of installing a photovoltaic module at each latitude can be equal to the efficiency of installing this module at the equator, that is, 47.93 % when installing the module at an angle of inclination to the horizon equal to the latitude. Tracking in the vertical plane makes it possible to increase the efficiency of the photovoltaic module installation by up to 50 %. Compared to full tracking, tracking in the horizontal plane at an angle of latitude makes it possible to obtain the efficiency of the installation of the photovoltaic module at the level of 97.93 %.
The results could be used as a basis for evaluating the efficiency of the installation of photovoltaic modules at different latitudes with different techniques of their installation, as well as for the subsequent generation of electricity