bluuebunny/crossref_metadata_2025 huggingface dataset:
EVALUATION OF THE RELIABILITY OF ALBATROSS GANTRY CRANE MECHANISMS
Authors:   Odesa National Maritime University, STRELBITSKIY Victor
Published: February 2023

Portal cranes are widely used to perform transshipment operations in sea and river areas. Since they are the main link in the technological process, so the performance of Port lines directly depends on their reliable and continuous operation. However, today in the river and sea ports of Ukraine, more than 88% of cranes have fulfilled the standard service life and continue to be operated. Since overtime and long-term operation of metal structures of overhead cranes in the mode of intensive cyclic loading leads to the formation of fatigue defects and subsequent failure of components and accidents. Therefore, ensuring safe and reliable operation is one of the main tasks in the design, modernization and operation of cranes. The analysis of works on the reliability of complex technical systems indicates that the issue of reliability of gantry crane mechanisms, which have been soldered for more than 35 years in seaports, is not sufficiently studied. The purpose of the work is: analysis of failures of mechanisms that occur during the operation of gantry cranes with overtime service life, based on the obtained data, failure and recovery coefficients are calculated.. Operating time affects the mechanical characteristics of materials ambiguously. The aim of the study is to analyze the failure statistics of gantry crane mechanisms with overtime periods to determine, determine the failure and recovery rates. The 30 identical Albatross cranes with a lifting capacity of 16 tons were selected for research, which operate in Grab mode and operate in seaports. Cranes are divided into 3 groups by year of production. The average annual capacity of cranes was 520 thousand tons, according to the warehouse-ship option. From the obtained data, the largest number of failures is observed in the lifting and turning mechanisms, the smallest – in the load lifting mechanism. Thus, the analysis of the results obtained showed that the largest number of failures is observed in the mechanisms of lifting and turning, the smallest – in the mechanisms of lifting the load and moving the crane.
INFLUENCE OF BOUNDARY CONDITIONS ON THE OBJECTIVE FUNCTION IN THE COMPUTER DETERMINATION OF THE OPTIMAL PATH FOR AN UNDIRECTED GRAPH
Authors: SHCHERBAN Volodymyr , ISHCHENKO Valentin , KOLISKO Oksana , GOLDBERG Marjana ,   Kyiv National University of Technologies and Design, SHCHERBAN Yuryj ,   Kyiv Professional College of Applied Sciences
Published: February 2023

The minimum necessary tension will be determined by the objective function, which is the minimum sum of the angles of coverage of the guiding surfaces by the thread. A recursive approach is used to determine the thread tension in the working zone, in which the output tension after the obstacle in the previous zone will be the input before the obstacle in the next zone. Algorithms and computer programs were used to find the optimal path of an undirected graph using Dijkstra’s algorithm, which made it possible to determine the influence of boundary conditions on the objective function, taking into account the specifics of the design of the thread feeding system. This leads to a decrease in thread breakage. Minimizing thread tension on technological machines allows to reduce the probability of breakage in the working area. The minimum necessary tension will be determined by the objective function, which is the minimum sum of the angles of coverage of the guiding surfaces by the thread. The use of algorithms and computer programs for finding the optimal path of an undirected graph using Dijkstra’s algorithm allows determining the influence of boundary conditions on the objective function. Determination of tension and changes in relative tension in the filling zones of knitted and textile machines, taking into account the specifics of the design of the thread feeding system, allows to reduce the breakage of threads, to optimize thread tension in the working zone of the formation of the output product. Determining the influence of boundary conditions on the objective function during the computer determination of the optimal path for an undirected graph in the search for the optimal path is an important component of the optimization of thread tension in the working zone of the formation of the output product. Reducing the friction force between the thread and the guide surfaces is achieved by optimizing the geometric parameters of the thread feeding system on the technological equipment. Practically, this is realized by building such a broken form of the thread, in which the total angle of coverage of the constructive structural elements of the technological equipment will have a minimal value. Constructive structural elements are presented in the form of guides of cylindrical shape and in the form of a torus, elements of tensioning devices, devices for monitoring breakage. Construction of the optimal path of an undirected graph will allow obtaining the minimum tension in the working area. Taking into account the large number of structural elements of the thread feeding system on technological machines, their location in the plane and space, there is a need to use modern information technologies.
MULTIMODAL SPEECH RECOGNITION BASED ON AUDIO AND TEXT DATA
Authors: BASYSTIUK Oleh , MELNYKOVA Nataliia ,   Lviv Polytechnic National University
Published: February 2023

Systems of machine translation of texts from one language to another simulate the work of a human translator. Their performance depends on the ability to understand the grammar rules of the language. In translation, the basic units are not individual words, but word combinations or phraseological units that express different concepts. Only by using them, more complex ideas can be expressed through the translated text. The main feature of machine translation is different length for input and output. The ability to work with different lengths of input and output provides us with the approach of recurrent neural networks. A recurrent neural network (RNN) is a class of artificial neural network that has connections between nodes. In this case, a connection refers to a connection from a more distant node to a less distant node. The presence of connections allows the RNN to remember and reproduce the entire sequence of reactions to one stimulus. From the point of view of programming, such networks are analogous to cyclic execution, and from the point of view of the system, such networks are equivalent to a state machine. RNNs are commonly used to process word sequences in natural language processing. Usually, a hidden Markov model (HMM) and an N-program language model are used to process a sequence of words. Deep learning has completely changed the approach to machine translation. Researchers in the deep learning field has created simple solutions based on machine learning that outperform the best expert systems. In this paper was reviewed the main features of machine translation based on recurrent neural networks. The advantages of systems based on RNN using the sequence-to-sequence model against statistical translation systems are also highlighted in the article. Two machine translation systems based on the sequence-to-sequence model were constructed using Keras and PyTorch machine learning libraries. Based on the obtained results, libraries analysis was done, and their performance comparison.
ENZYMES AND APPROACHES TO THEIR APPLICATION IN THE LEATHER PRODUCTION
Authors: KOPYTINA Iryna , ANDREYEVA Olga , MOKROUSOVA Olena , OKHMAT Olena ,   Kyiv National University of Technologies and Design
Published: February 2023

In a market economy, the leather industry faces new challenges, including the need to improve and optimize technological processes to achieve the required quality of final products and comply with environmental legislation. The practical experience and long-term achievements of the authors in the field of natural leather production indicate the importance of choosing the right method and materials for processing raw and semi-finished hides. One proven solution is the use of enzymes. Based on the results of the analysis of literary sources, information on traditional ideas about enzymes and approaches to their use in the production of natural leather is systematized. According to established ideas, enzymes are not just organic substances, proteins, but also high-speed catalysts for multiple chemical and biochemical reactions. Preparations based on enzymes have been commercially studied in detergents, food, light, pharmaceutical, diagnostic, chemical and other industries, in the agro-industrial complex. This prevalence is explained by the fact that the use of these funds contributes to improving the quality of products, culture and the level of greening of production, more rational use of raw materials and material resources. In the leather industry, enzymatic processes have gone through a long evolutionary path – from the use of primitive improvised means to the use of preparations that are more up to date with the requirements of the time. According to the modern classification, enzymes are divided into six main classes according to the nature of the catalyzed reaction. In the manufacture of genuine leather, taking into account the nature of the substrate (proteins, carbohydrates, lipids), preparations based on enzymes are used that belong to the class of hydrolases (proteases, amylases, lipases) and differ from each other in the active center and mode of action. The preparations used can either accelerate processes that usually proceed slowly (soaking), or provide a specific transformation of raw material (bating), or replace known chemical reagents (unhairing). The results obtained will be taken into account in the future when studying innovative approaches to the enzymization of leather production.
IMPROVEMENT OF GRAIN TRANSPORTATION TECHNOLOGY FROM COMBINES
Authors: Fryshev Sergii , Lukach Vasyl , Ikalchyk Mykola , Vasylyuk Volodymyr ,   Separated Subdivision of the National University of Life  and Environmental Sciences of Ukraine “Nizhin Agrotechnical Institute”
Published: February 2023

The article provides a rationale for an improved technological process for transporting grain from grain combines (ЗK) by a semi-trailer dump truck (НП) in an aggregate with a tractor and a saddle trailer. One of the main reserves for increasing the productivity of a combine is to increase the utilization factor of its shift time by using transshipment technology based on interoperation compensators – tractor trailers for reloaders of the PBN-30, PBN-40, PBN-50 brands, etc. and heavy vehicles (AT), in the body which grain is being reloaded outside the field. The lack of technology is significant downtime of vehicles. A comparative analysis of various technological schemes for the operation of the (ЗK) and vehicles showed that the minimum specific duration of harvesting and transport operations is achieved by using a tractor with a tractor to work in the field, subject to the minimum time spent on the formation (uncoupling, hitching) of transport units using a fifth wheel coupling device, which fitted with a trailer. At the same time, vehicles are used as negotiable (НП)s, which makes it possible to organize the continuous operation of tractors in the sections “ЗК – edge of the field” and “edge of the field – grain receiving point”, where possible downtime of the AT is replaced by downtime only of the НП. We have proposed a technical solution containing a temporary redistribution of the mass of grain in the body of the НП by loading it into the front part of the body. At the same time, the rear wheels of the НП are partially unloaded and do not over-compact the soil, and the rolling semi-trailer, equipped with wide-profile low-pressure tires, perceives additional load without significant soil compaction. The theoretical analysis of the rhythm of the processes of grain movement by individual technological links of the harvesting and transport complex made it possible to determine the analytical dependences of the main parameters of these links on the productivity of the grain combine and the volume of its bunker, the nominal load capacity of the НП, the duration of the НП recoupling, the distance of grain transportation, the average technical speed of the tractor and the car. The use of semi-shuttle transporters operating in two stages: in the field and on the road, provides a 1.5-fold increase in the productivity (average output) of the AT, and also eliminates the cost of specialized reloading trailers and double reloading of grain.
SIMULATION OF THE RECIPE COMPOSITION OF HEALTHY FOOD PRODUCTS BASED ON FUNCTIONAL COMPOSITIONS
Authors: ANTONENKO Аrtem , , BROVENKO Tetiana ,   Kyiv National University of Culture and Arts, KRYVORUCHKO Myroslav ,   State University of Trade and Economics, STUKALSKA Nataliya ,   National University of Food Technology, TOLOK Galina ,   National University of Life and Environmental Sciences of Ukraine, TONKYKH Oleksii ,   Kyiv National University of Culture and Arts
Published: February 2023

The article provides justification and development of the methodology for modeling the recipe composition of health food products based on functional compositions. The basis of the modeling is the principle of food combinatorics, which consists in the justified quantitative selection of the main raw materials and food additives, which together ensure the formation of the necessary organoleptic and physicochemical properties, the given level of nutritional (food, biological) and energy value. Modeling of food products is the process of creating a product as a single integrated system consisting of elements that do not individually provide the specified properties. Conceptual approaches to the modeling of functional compositions and products based on them consist in optimizing the selection and ratio of ingredients, by which it is possible to obtain a composition that, in terms of quantitative content and qualitative composition, best meets the indicators of nutritional value and medical and biological requirements. The application of a mathematical apparatus based on the formalization of qualitative and quantitative indicators of the composition, nutritional value of individual ingredients and their combinations in the composition of model functional compositions allows, through simulation modeling, to determine the total content of an individual component. Taking into account the above-mentioned factors, the modeling results, as a rule, provide effective optimization of the product composition and parameters of individual operations of the technological process. Upon completion of the stage of multi-level experimental modeling, the functional compositions and technologies of the products are checked in laboratory and production conditions, after which their final adjustment is made. At the final stage, comprehensive studies of the main indicators of the quality of finished products, calculation of economic indicators, testing of technology in production conditions, preparation, coordination and approval of regulatory documents and organization of industrial implementation are carried out. The application of the design methodology of model functional compositions and food products allows to increase the degree of use of raw materials and expand the assortment of products with a given composition and properties for health purposes.
THE CURRENT STATE OF POLYMER WASTE MANAGEMENT
Authors: YEFREMOVA Olha , IVANISHENA Tetiana , ISHCHUK Tetiana , TRUKHINA Oksana , YEFREMOVA Yuliia ,   Khmelnytskyi National University
Published: February 2023

In the work presents the results of the analysis of the current state of polymer waste management in Ukraine and the world. It is known that the vast majority of such waste accumulates in landfills or enters the natural environment. Such a threatening situation requires the search for an effective solution to the problem of polymer waste management, since its processing contributes to the preservation of natural resources and the solution to the problem of the shortage of polymer raw materials. The quantitative and qualitative composition of such waste was analyzed and it was established that the most frequently used types of plastic are polyolefins. Since the management of a large amount of plastic waste is a difficult task, the state regulation of the polymer waste management system is of great importance in this area. In Ukraine, this is being implemented thanks to the adoption of the National Waste Management Strategy in 2017. An assessment of possible ways of recycling polymer waste was carried out in order to solve the problem of shortage of polymer raw materials. Today, polymer waste can be disposed of in three directions: material (polymer-raw material); raw materials and energy. The main methods of their processing and directions of use of the obtained products were studied. The most popular methods are physical, chemical and thermal. It has been established that the recyclates obtained in this way can most often be used in the food, processing, construction industries, as well as in automobile and aircraft construction. A fairly promising direction of using recycled products is light industry products with additional hydrophobic, fire-resistant, flame-retardant, conductive, heat-insulating, anti-corrosion, airtight and other operational properties.
IMPROVING THE EFFICIENCY OF AUTOMATION THE SCALING OF MICROSERVICES IN THE KUBERNETES CONTAINERIZED APPLICATION MANAGEMENT SYSTEM
Authors: MAYEVSKIJ Yaroslav , PRAVORSKA Natalya ,   Khmelnytskyi National University
Published: February 2023

Automatic container scaling in Kubernetes plays an important role in handling incoming requests from web application users. This article analyzes the stages of container scaling, their initialization and subsequent software launch. In order to achieve low latency of user requests in the case of dynamic load, the analysis of the process of automatic scaling of containers and the factors that will affect the scaling process was carried out. Having a full understanding of the processes and mechanisms by which scaling takes place, it became possible to develop a method and strategy for cleaning obstacles that slow down the autoscaling process itself and at the same time preserve the necessary properties of the existing scaling. Acceleration of scaling of containers, which will directly affect the speed of web services, becomes possible precisely because of the elimination of the delay in automatic scaling of containers. The work considered scaling optimization using not only container pre-creation networks, but also the use of container images, which enable the sharing of linked libraries in memory and the extension of Kubernetes’ declarative configuration management approach for parallel creation of multiple container instances. Based on the obtained research results, a method for optimizing the automatic scaling of containerized applications by eliminating the delay during a cold start has been developed. This latency manifests itself in the case of microservice autoscaling, where Kubernetes is expected to scale containers horizontally by creating additional replicas to the required number to handle the required traffic from the outside. The delay caused by the autoscaler affects the processing time of the user’s web service requests.
RESEARCH OF TRANSVERSE GLUING OG LIGTHINDASTRY PARTS WITH POLIMERIC MATERIALS
Authors: HORIASHCHENKO Serhiy , HOLINKA Ievgeniia , DRAPAK Georhiy , HORIASHCHENKO Kostyantun ,   Khmelnytskyi National University, POLISHCHUK Oleg ,   Khmelnytskyi National University
Published: February 2023

The paper presents the results of research on the preliminary gluing of parts of light industry, namely parts made of leather and artificial leather into a package. Zonal application of polymer adhesive material and a defined strength value for different types of packages are proposed. The relative displacement of the parts will lead to a violation of the integrity of the package and the destruction of the adhesive bond between them. That is, any relative displacement of the parts must lead to the destruction of their previously set position and is considered unacceptable. Therefore, determining the strength of the adhesive fixation of parts, which keeps them in a given position and determines the main task of the research. The substance used as an adhesive must ensure the fixation of the details of the shoe upper in a short period of time. This time is necessary only for the formation and stitching of a package of parts and depends on the parameters of the technological process and the performance of the equipment. In our case, when a pair of shoe upper blanks must be formed in one minute. To accurately determine the strength of the adhesive interaction between two parts, it is proposed to use the method of shifting (tearing) the adhesive joint. It was taken into account that natural and artificial leather have front and back sides that differ from each other. Namely, the dorsal side has larger capillary radii and greater porosity than the front side. Polymer material for gluing – Desmocol – was also chosen for research. The obtained values made it possible to form a general characteristic of the strength of adhesive joints for this type of polymer material used as glue. The obtained data show that it is quite possible to use the proposed zonal application of polymer adhesive material to ensure the non-slip strength of pre-glued parts. The strength value is sufficient for the further transportation of parts of the light industry to the next technological position without displacement. This can be used for systems of automated assembly of shoe upper blanks, stitching, manipulation, etc.
METHOD OF FORMING THE CONTEXT OF ADVERTISING AND TARGET AUDIENCE BASED ON ASSOCIATIVE RULES LEARNING
Authors: LIPIANINA-HONCHARENKO Khrystyna , KOMAR Myroslav , SACHENKO Anatoliy , LENDIUK Taras ,   West Ukrainian National University
Published: February 2023

Nowadays, important mechanisms of study are content and techniques of its creation, the problem of influencing the target audience, which itself seeks to shape communication processes. Internet content occupies a position of powerful communication technology, which continues to grow rapidly and gain influence. Creating a large number of advertisements, especially texts, is extremely expensive. Therefore, it is worth considering how generate these texts automatically. In this regard, it is possible to assume that the development of a method of forming the context of advertising and target audience based on learning associative rules is relevant and can increase the effectiveness of advertising, and thus reduce the cost of online advertising of higher education institutions. The input data used a survey of students majoring in Computer Science, regarding admission. The 152 students took part in the survey and answered 10 questions. The experimental results confirmed, the proposed method enabled to increase the effectiveness of advertising on social networks at least in 23%, and reduce the price in 90%.
CORRECT MECHANIC AND TECHNICAL CHARACTERISTICS OF «LAUNCH» AND «PEAK»
Authors: MIEshkov Yurii , Voytovich Olga ,   Kherson National Technical University
Published: February 2023

The article compares the mechanical and technical characteristics of car lifts used at all car service centers. Over the last 20 years, two-post lifts have taken their place and gained popularity, they have overtaken four-post lifts by more than three times, if only because they cost less. Two-post jacks were originally used to check and service oil, tires, etc., but are now widely used for major activities (although four-post jacks are still required for a full MOT). Nevertheless, many experts do not stop reporting the risk of falling vehicles from two-post lifts. There have been known cases over the past five years, when not only the car was damaged during the fall from the lift, but also the workers were seriously injured, and there were also fatal cases. Therefore, the opinion of the inspection department is that any fall of the vehicle from a height carries a high risk and fatal injuries. Manufacturers of medium and premium lifting equipment began to introduce budget models into their lines. They follow the path of structural simplification of models, reduce production costs, use cheaper metals, remove electronic systems, which allows to reduce the cost of equipment. The lift market shows almost no changes in terms of assortment. It is segmented according to the type of lifters – two-post, plunger, scissor, roll-up ditch, four-post, multi-post plunger. When considering the market of lifting equipment, one cannot ignore the Chinese car manufacturers, which occupy a solid share in the overall structure of this product group. “The Chinese equipment market is now clearly divided into two classes – one is represented by cheap and low-quality products, and the other is a segment of equipment of decent quality. There is a clear difference between the two segments that is clear to a professional. When choosing Chinese lifts, customers understand that if they ask for little money for the equipment, it will not last long. There is a lot of such low-quality equipment on the market, and this product generally discredits the entire segment from China.
IMPROVING THE ACCURACY OF THE VIBRATION ANALYSIS OF ON-BOARD ELECTRONICS PRINTED BOARDS
Authors: GOROSHKO Andrii , KOVTUN Igor , ZEMBYTSKA Maryna ,   Khmelnytskyi National University
Published: February 2023

Electronic equipment of aircraft during operation is exposed to vibrations with a frequency of 20-2000 Hz and a vibration acceleration of up to 20g. Almost half of all failures of on-board equipment are caused by the negative impact of vibration. For effective vibration protection of the equipment during its design, a vibration analysis is carried out, recognizing resonance modes. The difficulty of modeling vibration processes in printed circuit boards lies in the deviation of calculated values of critical frequencies and values obtained experimentally with the help of shakers. The main reasons for this in the known analytical methods are the impossibility of fully accurate consideration of the concentrated masses and elastic-damping characteristics of individual electronic components of the board, its fasteners and device cases, which, in turn, leads to the appearance of coupled oscillations. The paper presents the results of vibration analysis by well-known analytical methods, numerical and experimental methods. It is shown that the accuracy of determining the natural frequencies and forms of board oscillations is significantly influenced by the geometric, inertial, and elastic-damping characteristics of the board components. The effectiveness of numerical modeling methods is demonstrated. When arranging massive components at the stage of designing the board, it is necessary to take into account that the natural frequency of the board depends on the position of its center of gravity and increases sharply when approaching the edge of the board. Boards with a small number of components have a lower critical frequency than their corresponding empty boards due to the increase in mass. Instead, boards densely filled with components have a higher natural frequency than empty boards due to increased stiffness. In order to increase the accuracy of the vibration analysis, it is necessary to conduct a preliminary analysis of the elastic and damping parameters of attaching the board to the case and the case itself.
EXPERIMENTAL RESEARCH AND GROUPING OF OPERATING STAFF OF SEARCH SYSTEMS IN THE SENSE OF STRESS RESISTANCE
Authors: KAMINSKY Roman , SHAKHOVSKA Nataliya , KHUDOBA Bohdan ,   Lviv Polytechnic National University
Published: February 2023

In modern information and search automated systems, the main role is played by the human-machine interface for decision-making based on the detection of objects of a given class in the information field. The human operator, as an element of such an interface, carefully reviews the provided information on the information field – the monitor screen, analyzing images of scenes, for example, pictures of territories, economic tables, abstract data, etc. Based on the received results of the analysis, the operator forms or chooses from a set of alternatives the appropriate decision, for which he mostly bears some responsibility. Such, let’s call them primary solutions, can be both final and the basis for further functions of this search engine. However, among the factors that in one way or another can negatively affect the quality of work of this interface, one of the first places is stress in the form of a collection of micro stresses. The main goal of this study is to develop a methodology for the organization of experimental selection of operator personnel based on the study of their behavior under the influence of micro-stresses. A human-machine interface model has been developed, which takes into account the change in the functional state of the human operator. The presented concept of the difficulty of detecting the object of attention contributed to the development of a special sequence of ordinary test images with stressor images included in it, and presented models of the flow of presenting test images to the recipient. With the help of descriptive statistics, the parameters of individual boxplot diagrams were determined and the recipient group was clustered. Overall, the proposed approach based on the example of the conducted grouping makes it possible to ensure the objectivity and efficiency of the professional selection of applicants for operator specialties. The developed methodology is of practical importance and can be used in systems of training, certification and professional selection of operator personnel.
ASPECTS OF WETTING OF HYDROPHOBIZED SURFACES TEXTURED BY A FEMTOSECOND LASER
Authors: MYRONYUK Oleksiy , BAKLAN Denys , GLUKHOVSKY Vladislav ,   National Technical University of Ukraine ‘‘Igor Sikorsky Kyiv Polytechnic Institute”
Published: February 2023

Extractive methods of obtaining textured surfaces to ensure superhydrophobic properties must have chemical treatment. This work is aimed at determining the influence of the chemical class of modifiers (silanes, perfluorosilanes, unsaturated long-chain carboxylic acids and low molecular weight polyethylene wax) and the level of micro- and nanotexture organization on the characteristics of surface wetting. The work involved texturing of anodized aluminum with a femtosecond laser to create structures. As a result, two types of textured surfaces were obtained: with a regular microtexture in the form of columns with a square section, and a disordered fractal nanotexture with a hierarchical structure. Chemical treatment of the obtained surfaces was carried out and their effectiveness was evaluated. The study of wetting properties of surfaces was carried out by the Zisman method both with individual solvents and with the use of mixtures of solvents. As a result of the work, it is shown that the choice of the modifier of aluminum surfaces textured by a femtosecond laser plays a decisive role in determining the wetting properties, namely the values ​​of the water wetting angle and surface tension, at which the loss of stability of the Cassie state is observed. It is shown that the influence of the chemical composition of the modifier is more significant than the dimension of the texture on the surface. In particular, it is shown that in the case of using silanes and fluorosilanes, it is possible to achieve a water contact angle of 155-160° on nanotextures, while the loss of the Cassie state begins below 46-49 mN/m. When using hydrocarbon modifiers, it is possible to achieve the same high contact angles with water – 154° for oleic acid, but the stability of such surfaces is much lower – 55-65 mN/m. The difference in Cassie state stability between micro- and nanostructures was found to be within the measurement error.
STUDY OF THE INFLUENCE OF LOW TEMPERATURES IN DYNAMIC CONDITIONS ON SPECIAL MATERIALS FOR INSULATING SUITS OF CHEMICAL ENTERPRISES
Authors:   Volodymyr Dahl East National University, MIHAILOVA Nina , PRIVALA Valerii ,   Khmelnytsky Natіonal Unіversity
Published: February 2023

Domestic chemical industries urgently need the creation of special high-class protective clothing to allow working in extreme conditions without endangering the lives and health of workers. In previous publications, it was determined that the necessary comprehensive protection against the effects of harmful production factors is provided by the creation and use of an insulating suit, which should become a barrier that prevents the penetration, and therefore the influence of mineral acids, alkalis, ammonia, salt solutions, etc. different concentrations. That is, it is about the creation of special clothing with the necessary level of provision and preservation of such basic protective indicators as chemical resistance and impermeability of the material while preserving the tightness of the product as a whole. Preparation equipment and fitters for cleaning closed containers for transportation and storage of aggressive environments can simultaneously be exposed not only to mineral acids, alkalis, solutions of salts based on them, but also to the remains of liquid ammonia, the evaporation of which occurs when the temperature drops, which leads to the primary destruction of the polymer coating materials of special suits. For example, local destruction in contact with liquid ammonia leads to a sharp cooling (up to – 340C) of the contact surface of the material and destruction of the polymer coating, especially during operation (in dynamics), which can lead to a violation of the tightness of the protective product. Since workers have to perform a significant number of work movements while in an insulating suit, there was a need to study such an indicator as the resistance of materials to dynamic loads in conditions of low temperatures. Research was conducted on samples of materials with a polymer coating, which belong to the class of artificial leathers for special purposes from both foreign and domestic manufacturers.
PROJECT CONCEPTION OF CAE-SYSTEM FOR WEAR ANALYSIS OF FRICTION BEARING UNDER CONDITIONS OF SHAFT AND LINER AXIS MISALIGNMENT
Authors:   Khmelnytskyi National University, SOKOLAN Iuliia , MYLKO Volodymyr ,   Khmelnytskyi National University, TKACHUK Vitaliy ,   Khmelnytskyi National University, SOKOLAN Kateryna ,   Khmelnytskyi National University
Published: February 2023

Modelling of wear processes is an important stage in the design of mechanisms. Such virtual studies allow predicting the service life of components and the machine as a whole. Modern algorithms of CAE-systems allow performing such analysis with high accuracy and taking into account not only material and operating conditions of the mechanism, but also errors that occurred during the manufacturing and assembly of a particular part. These parts require high requirements to the accuracy of manufacturing and assembly, but within the tolerances of the fields errors of mutual positioning are still allowed, which in turn can significantly affect the service life of the mechanism. Therefore, the task of modeling the wear process of the shaft and sleeve in conditions of mutual misalignment of the axes is relevant. Such sliding pairs exist in almost all machines, including car engines, power generation turbines, etc. In this article it is offered to use the module-integrated approach for modeling of wear processes in tribotechnics, providing use of CAE-systems for definition of functioning conditions of friction units as a system core, and construction of separate modules which in this or that degree are integrated into existing CAE systems. to define values of wear of elements of friction pairs that allows to consider mutual influence of wear and change of functioning conditions in the course of operation. The practical implementation of the module-integrated approach is shown by the example of solving the problem of radial plain bearings wear during the misalignment of the shaft and bush axes in the ANSYS environment. The module of representation of multidimensional matrixes of static or dynamic data, providing essential increase in speed of data processing and quality level of the further analysis of the visualized information from any subject area, is developed.
CURRENT STATE OF SOLAR PHOTOVOLTAIC PANELS WASTE MANAGEMENT OPERATIONS IN UKRAINE
Authors: KATENIN Vadym , SAMOILENKO Nataliia ,   National Technical University «Kharkiv Polytechnic Institute»
Published: February 2023

The paper analyzes the steady trend of solar energy development, which is accompanied by the formation and accumulation of solar panel waste. This process requires the application of accomplished waste management and the development of waste disposal technologies. It was determined that the problem of waste solar photovoltaic panels becomes more urgent due to the military actions taking place on the territory of Ukraine. The general characteristics of waste for different types of panels are given. The heterogeneity of the materials of photovoltaic panels leads to an ambiguous classification and involves a combination of safe and dangerous components. It has been determined that photovoltaic panel waste can be divided into two hazard classes: hazardous waste and non-hazardous waste. The key points of solar panel waste management operations are characterized in accordance with the Law of Ukraine “On Waste Management” and EU Legislation. The main points of disposal of unusable photovoltaic panels with recovery of valuable raw materials are described. It is noted that there are significant differences in the material composition of crystalline silicon panels and thin film modules. It is noted that two processing types of PV modules are currently distinguished – coarse and fine, and the most effective steps in the preparatory stage of disposal are also determined. In general, PV panel waste disposal operations combine mechanical and chemical material extraction processes. The imperfection of the legislative and regulatory framework in the field of waste management, the increase in the ecological danger of the generation and accumulation of waste, the imperfection of the information base and waste monitoring, the insufficient development of the processes of organizing the processes of collection, accumulation and transfer of waste for disposal, the insufficiency of proposals for methods of processing and disposal of solar panels waste as a valuable resource of secondary raw materials are notable as the main problems in the field of waste management of photovoltaic panels in Ukraine. One of the main tasks for development is to increase the share of waste materials that are currently not disposed of, but can be used as secondary raw materials.
DEVELOPMENT OF THE DICTIONARY STRUCTURE FOR THE CHAT-BOT OF EDUCATIONAL SERVICES CATALOG OF THE HIGHER EDUCATION INSTITUTION
Authors: SHILINH Anna , PASKO Anastasiia ,   Lviv Polytechnic National University
Published: February 2023

The aim of this article is to develop a dictionary structure for a chatbot of educational services catalog of the higher education institution. The quality of information support for consumers of educational services depends on the timeliness and reliability of the information provided. If the World Wide Web user does not receive information from official sources of the higher education institution (HEI), this may cause a negative impact on the information system of the higher education institution. The motivational intentions of the official web resources users of the higher education institution in thematic requests to the chatbot correspond to specific sections in the educational services catalog of the higher education institution. Therefore, the lexical selection of motivational intentions, which are characterized by keywords in the thematic query, makes it possible to clearly formulate/correct the completeness of the provision of relevant information. This will make it possible to rationally use the communication process between higher education institution and educational services consumers. As a result of the research, the structure of the lexical content of the dictionary for the chatbot of the educational services catalog is proposed, taking into account the peculiarities of the formation of users information needs from official web resources of the higher education institution. Each thematic request to the proposed chatbot is characterized by a set of keywords that correspond to certain sections of the educational services catalog of the higher education institution. The importance of these keywords are determined by the weighting factor, which shows the relevance of the thematic query to the section of the educational services catalog. For this, a statistical indicator was used, which evaluates the keywords in the query and reduces the importance of common words. The results of the research are applied and can be used for effective communication between the higher education institution and consumers of educational services using HEI’s official resources for effective planning of educational services.
SIMULATION OF WORKING MODES OF THE ELECTRICAL DRIVE OF A LIFTING CRANE WINCHES IN MATLAB
Authors: BABIY Sergiy , MOSHNORIZ Mykola , PROCENKO Dmytro , PAYANOK Oleksandr , ZHUKOV Oleksiy ,   Vinnytsia National Technical University
Published: February 2023

Among the most common mechanisms in the industry are lifting machines of various types and designs. They are widely used in construction and assembly, repair, warehouse and other works related to lifting and moving large and heavy loads. The main and most energy-intensive mechanism of lifting machines is the lifting winch. The electric drive of the lifting winch must meet the increased operational requirements and ensure the performance of the given speed diagram, the necessary dynamics of work and high reliability in the operating modes. The energy indicators of the electric drive of the lifting winch mainly determine the energy indicators of the machine as a whole, therefore, due attention should be paid to the issue of designing the electric drives of the lifting winches. It is worth noting that the kinematic connections of the lifting winch are not absolutely rigid, which determines the occurrence of oscillations in the system as a result of dynamic forces. It is the presence in the electromechanical system of the lifting winch of elements with high inertia that causes the appearance of elastic oscillations during any transient process in this system. The presence of elastic oscillations in the mechanical system of the electric drive distorts the speed graphs of the system and leads to force pulsations. Elastic oscillatory processes in mechanisms lead to unpredictable behavior of the system and can cause emergency situations. Thus, taking into account the elastic properties of the mechanical system during its design will improve the efficiency and reliability of its operation. The results of the research carried out in the work contain the analysis of static loads of lifting winches of lifting and transport mechanisms and a generalized mathematical model of the crane lifting winch. On the basis of the proposed mathematical model, a structural diagram of a lifting winch was developed and implemented as a computer model in the form of a Matlab Smulink PPP library block. The mathematical and computer models presented in the work allow obtaining correct results in the entire range of loads, taking into account the change in the efficiency of the mechanical transmission when the loads and the direction of transportation change, and also take into account the influence of the elastic connection between the drive motor and the actuator. The use of the proposed models will significantly simplify the process of designing the power electric drive of lifting winches of cranes.
Encuentro familiar
Authors: Ospina Botero Mireya
Published: February 2023

Introducción: El encuentro familiar es una actividad formativa que, como su nombre lo indica, está dirigido a todo el grupo familiar. En él se desarrollan diferentes momentos que permiten una reflexión sobre la vida de familia alrededor del tema de la comunicación. Su guía metodológica contiene tres fases: la inicial, donde se hace una introducción al tema; en la segunda, un trabajo en subgrupos; y finalmente se reúnen las familias para realizar un diálogo sobre las alternativas de comunicación que pueden desarrollar para mejorar sus relaciones familiares.
Location-based service information disclosure on social networking sites: The effect of privacy calculus, subjective norms, trust, and cultural difference
Authors: Van Binh Tu , Minh Dinh Tien , Linh Le Thi Hue , Van Nhan Tran
Published: February 2023

Along with the development of social networking sites, sharing location is becoming mainstream, offering many opportunities and promoting sustainable business performance of firm. Based on a survey of 433 Facebook users and the application of quantitative method, the paper found that the privacy concern substantially influences the perceived risk of location sharing. In addition, tendency is witnessed on trust in the social networking site providers and members. Also, impression management and incentive provision are strongly involved in the perceived benefits of location information disclosure intention. Both perceived risks and perceived benefits illustrate distinctive effects on sharing users’ location. The impact of subjective norms on sharing information related to a users’ location and observing the potential influence of culture, played as moderator. The finding also confirms subjective norms positively impact location information disclosure intention, while the moderating of culture does not play a contribution role.
Development and psychometric evaluation of a theory-based questionnaire measuring women’s return-to-work beliefs after long-term sick leave for common mental disorders
Authors: Hedlund Åsa , Boman Eva , Kristofferzon Marja-Leena , Nilsson Annika
Published: February 2023

BACKGROUND: Common mental disorders (CMDs) are currently a major cause of long-term sick leave, with women being most affected. OBJECTIVE: Using the Theory of Planned Behaviour (TPB), we aimed to describe the development and psychometric evaluation of a new questionnaire to measure women’s beliefs about return to work (RTW) after long-term sick leave for CMDs. METHODS: Data were collected in central Sweden from women on long-term sick leave (2– 24 months) for CMDs. The questionnaire was developed by conducting an elicitation study with 20 women and included both direct and indirect measures. Subsequently, 282 women participated in a psychometric evaluation and 35 of them in a test-retest procedure. Psychometric properties were evaluated by determining reliability (internal consistency [Cronbach’s alpha] and test-retest stability [intraclass correlation coefficient]), construct validity (exploratory factor analysis) and content validity. RESULTS: The development resulted in 60 questionnaire items. Content validity assessment showed that the women overall found it easy to complete the questionnaire. Reliability analyses showed satisfactory results for both direct and indirect measures, with a few exceptions. Factor analyses of the indirect scales showed that items were generally in line with the TPB, but that items related to life as a whole/personal life and items related to work were separated into two different factors. CONCLUSION: The questionnaire, called the RTW Beliefs Questionnaire, showed promising results and can among women with CMDs be considered useful, especially the scales for direct measures. This questionnaire gives opportunity to identify new potential predictors for RTW.