bluuebunny/crossref_metadata_2025 huggingface dataset:
The functional stability of technological processes and formation of individual strategy for management of operation of production centers
Authors:   State University of Telecommunications, Sobchuk V. V. , Zamriy I. V. , Vlasyk H. M. , Zinchenko O. V. , Kravetsʹ V. I. ,   Dmytro Motornyi Tavria State Agrotechnological University
Published: January 2022

The article studies the characteristics of the behavior of complex technical systems that implement the property of functional stability of these systems. The mathematical model describing technological processes at the industrial enterprise is resulted, the definition of functionally stable production process of the industrial enterprise and the criterion of maintenance of its functional stability with use of pseudoinversion is formulated. The conditions for ensuring the functional stability of the technological process are given and practical recommendations for the application of these conditions for decision-making in the practical implementation of production processes are described. Ensuring the functional stability of production processes is now one of the most important tasks. Currently, many different methods have been proposed to ensure a high level of functional stability, but this issue requires constant improvement and development of new approaches. In order to improve and develop methods of organizing production processes that ensure the functional stability of technological processes through the implementation of individual strategy of operation of relevant production centers, an approach to the formation of management strategy of production center, which provides functional stability of the technological process. The individual strategy of planning of operation of technical systems depending on their actual condition taking into account features of the given concrete system is investigated.
Assessment of confidentiality risks of information security of projects based on fuzzy logic
Authors:   State University of Telecommunications, Asieieva L. A. , Shushura O. M. ,   National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»
Published: January 2022

One of the main components of enterprise information security management is its risk assessment. This is especially true for critical infrastructure enterprises and their business partners, including construction companies. However, measuring cybersecurity, even with the current skyrocketing costs of cybersecurity, remains an underdeveloped topic, so developing and agreeing on reliable ways to measure its risks and effectiveness is relevant for research. In many industries, the activities of enterprises are of a design nature and information security management must also be implemented within the framework of the project, which requires further research in this area. Given the incompleteness and vagueness of information about the components of information security, fuzzy logic is actively used in risk assessment models. The article proposes an approach for assessing the risks of violating the confidentiality of documents when solving information security problems of projects. The set of project documents is formalized in the form of a generalized hierarchical structure and the relationship of documents with operations and information systems that are used during operations with documents is determined. Based on the formalized structure of documents, a model has been developed for assessing the risk of violating the confidentiality of a document based on fuzzy logic, which allows one to take into account the incompleteness and blurring of data. The results of the work can be used when making decisions on information security measures for projects at enterprises with project activities, including at critical infrastructure enterprises, IT enterprises, construction companies and others. The proposed approaches can serve as a basis for the development of information technologies to automate the assessment of information security risks of projects.
The scheme of OLED control device for room lighting
Authors:   Lviv Polytechnic National University, Helzhynskyy I. I. , Kutsiy S. A. ,   Lviv Polytechnic National University, Veryha A. D. ,   Yuriy Fedkovych Chernivtsi National University, Lukova-Chuyko N. V. , Lukova-Chuyko N. V. ,   Taras Shevchenko National University of Kyiv
Published: January 2022

The electric scheme of control device of organic light-emitting diodes which are considered to apply for room lighting has been introduced. There are three channels with OLED adjustable brightness. This allows to control either tricolor panel sorlighting of three-room areas, orto perform a three-stage control of the light. Thus, it provides a gradual change in lighting brightness by alternating lighting in each of three channels. Its feature is to maintain constant lighting in the room depending on the time of day (outdoor lighting). The developed scheme of the device can be used in such systems as "Smart Home", one of the subsystems of which is the lighting subsystem. Its purpose is to control the lighting in the room for comfort and energy saving. The device has been designed in order to function on its own and it can be further developed for integration into the "Smart Home" system using a "single-wire" protocol for control. Since OLED can be applied into flexible substrates, light-emitting surfaces can be designed as a wall paper or plates that will be attached to the wall or ceiling. It can also be designed in the form of tension structures. The control scheme can be developed and improved, its functionality has to be expanded. It is also important to provide control on a local wireless network of Wi-Fi, etc. Unlike a silicon LED, the dependence of the luminous flux on the current through the organic LED has a slightly different character – it is nonlinear and with increasing LED current, the rate of brightness increases. This characteristic is taken into account in the laws of regulating microcontroller program which controls work of the device. In order to reduce the effect of light pulsations on vision, which are observed at short PWM pulse duration, the brightness is adjusted partly by PWM (from 50%to 100% ofthepulseduration) and partly by adjusting the supply voltage of the LEDs.
Expert systems in design of technological equipment
Authors:   Lesya Ukrainka Volyn National University, Krestyanpol L. Yu.
Published: January 2022

An expert system is a methodology for adapting an algorithm for successful solutions from one area of scientific and practical activity to another. With the widespread dissemination of information technology, it is an identical intelligent computer program that contains the knowledge and analytical skills of one or more experts in the field of application and is able to draw logical conclusions based on this knowledge, thereby providing solutions to specific problems in the design of technological equipment without the presence of an expert (specialist in specific problem area). An expert system allows to solve problems in a specialized subject area. Contemporary realities of the introduction of automated production do not provide a high-quality result, because all design decisions are made on the basis of subjective knowledge and intuitive feelings. One way to solve this problem is to develop formalized man-machine design methods at the early stages of creating a technological equipment project. This study describes the development process of an expert system, whose task is to solve problems of product modeling, optimization synthesis of the structure of a technological operation and the layout of a technological machine. In the study, the author identifies the stages of designing technological equipment, identifies the components of an expert system and a procedural model of the design process. The result of the work is the developed structure of software and information management of an automated information system for the design of technological equipment. The developed system will accelerate the process of decision-making in the design of technological equipment and receiving expert advice. The expert system will serve as the basis for the introduction of intellectual production and reasonable consumption, which is confidently marching along with the Fourth Industrial Revolution.
Justification of the scientific research task for estimation of the influence of the factors of ionizing radiation on the efficiency of application of atmospheric-optical communication lines
Authors:   State University of Telecommunications, Kyrpach L. A. , Turovsky O. L. , Blazhennuy N. V.
Published: January 2022

The structure, role and place of atmospheric-optical communication lines in modern information transmission systems and increasing the efficiency of their functioning are considered. The factors are analyzed, and especially such an environmental factor is taken into account, which directly affects the technical characteristics of the element base of atmospheric-optical communication lines, such as radioactive radiation. The source of such radiation can be a nuclear power plant accident, as a result of which a large amount of radioactive substances spreads into the surrounding space outside the nuclear power plant. The analysis of the radiation resistance of the element base of atmospheric-optical communication lines is carried out, which shows that the most vulnerable structural elements are infrared receivers. The technical condition of the receivers of atmospheric-optical communication lines under the influence of radioactive radiation will determine the general technical condition of the information system and affect the possibilities for their application. Radioactive radiation, which is also present in the space environment, is one of the factors in the manifestation of external influences and on the technical condition of aerospace technology. The radiation that occurs in the structures of integrated circuits when bombarded with high-energy particles leads to the generation of photocurrents that can change the operating characteristics of integrated circuits, in turn leads to failures in the transmission of information and to complete failure in emergency situations. The directions of improving the methods of accounting for the influence of atmospheric-optical communication lines on receivers are proposed.
A UML profile for quality-based web service selection using logic scoring of preference method
Authors:   Zaporizhzhya Polytechnic National University, Polska O. V. , Kudermetov R. K. ,   Zaporizhzhya Polytechnic National University, Zolotukhina O. A. ,   State University of Infrastructure and Technology, Shkarupylo V. V. ,   National University of Life and Environmental Sciences of Ukraine
Published: January 2022

In the modern information infrastructure, Web services have a very important role. Web services are one of the main tools for information creation, delivery and processing in society and economic life; for the formation and further evolution of the information space. Among the existing and constantly growing number of Web services, in a natural objective way, there are many Web services with the same or similar functional properties. This makes it possible to select among them such Web service that best satisfies the consumer’s requirements and is most suitable to consumer’s preferences on quality characteristics, for instance, cost, reliability, response time, etc. On the other hand, the consumer is not always possible to decide which Web service is the best from his point of view, because Web service has multiple quality characteristics. In this regard, many researchers formulate the problem of quality-based Web service selection as a multi-criteria decision-making problem and integrate the facilities for the decision-making into decision support systems. One of the methods of multi-criteria decision-making is the Logic Scoring of Preference (LSP) method. Given the current trends in the transition from document-based to model-based systems engineering, it is expedient to provide the design templates (meta-models or profiles) for the decision-making support systems developers. In this paper, a UML profile to design the quality-based Web service selection systems using the LSP method was proposed. Standard UML extension mechanisms (stereotypes, tag value definitions, and constraints) to capture the basic quality properties of the Web service and the rules of applying the LSP method operators for this profile were used. The efficiency of the proposed profile by the examples of modelling the LSP aggregators to aggregate the Web service quality characteristics was demonstrated. The correctness of the models created using the proposed profile in the MagicDraw modelling environment was verified.
Research of a smart energy system in the internet things
Authors:   State University of Telecommunications, Boyko M. Yu. , Mykolaychuk V. R. , Vlasenko V. O.
Published: January 2022

The work considers and investigates the intelligent power system in the Internet of Things. The purpose of the article is to study the intelligent network. The answer to the question «What is a smart energy system?». We compared traditional and smart power systems. Defined measurement infrastructure and technological criteria. Protocols and standards are reviewed. The relevance of the topic is because every day the demand and consumption for electrical energy is growing. The evolution of smart grid concepts in various power grids connects a huge number of devices, many of which are due to outdated automation protocols and internal information systems. Since many of these devices provide little or no indication of the semantics of their data, it is customary to manually create this information, which is cumbersome, expensive, and prone to errors. The Internet of Things is the next step in the evolution of our today’s Internet, where any physical object equipped with computing and communication capabilities can be easily integrated into various areas of our life. Thus, there is a need for an intelligent grid that can effectively solve various aspects of transmission and distribution, reducing the load on the power system, making it reliable and secure. One option to meet peak demand is to reinforce the distribution network with thicker cables and more powerful power systems. Another, more sustainable solution is the introduction of smart grid technology to balance energy demand and supply by increasing the flexibility of the electricity grid through the use of information and communication technologies and remote control in real time, for example, with the Internet of things, artificial intelligence, cloud computing and others. However, security and reliability is seen as one of the main obstacles to the rapid and largescale implementation and deployment of both the IoT concept and smart grid. It is expected that the smart grid and the Internet of Things will revolutionize various spheres of everyday life, industry and business.
Method of modelless online optimization of time calculation of finite IоT devices with provision of critically important delays for all levels of interaction
Authors:   State University of Telecommunications, Grynkevych G. O.
Published: January 2022

The problem of managing network resources considered in terms of convex online optimization (COO) based both losses and limitations. A general wording of the COO with long-term time constraints and relevant indicators for evaluating the COO algorithm are also provided. The solution to the optimization problem is based on elements of deep machine learning. This considers the COO with different time constraints that must be met in the long run. According to this parameter, the learner first performs a certain action, not knowing a priori neither contradictory losses nor time-varying constraints, which later appear naturally. Also, the standard loss-based COO structure was generalized to take into account both competitive losses and constraints. Unlike existing work, the focus is on a setting in which some limitations are detected after action is taken, they are acceptable for instantaneous violations, but on average must be met. Next, a modified method of dynamic optimization of network resources in intelligent networks (DONR) is introduced in this new COO structure, where the learning element deals with different time losses, as well as different time but long-term constraints. In general, it is proved that the DONR method ensures that dynamic losses and pre-results increase sublinewise, if the accumulated variations of minimizers and constraints known as sublinear increase. The process of development and characteristics of the developed DONR algorithm are described in detail.
IoT in modern web development
Authors:   State University of Telecommunications, Dzhereleyko A. O. , Yakovenko N. D. , Marchenko H. V. , Atashkade R. V.
Published: January 2022

In recent years, the IoT space has grown tremendously. Today, many IoT devices that previously existed only as a theoretical concept are now readily available on the market. In addition, significant achievements are available in the field of web development. The latest front-end technologies such as React, Angular, and Node.js have matured and become quite understandable. There are many open source IoT platforms to bring technology to life and link IoT and web development. Building web applications using the Internet of Things requires not only additional tools, but also high qualifications and related technical skills. Developers must be prepared not only for the implementation of web projects, but also for the implementation of IoT projects. As a conclusion, we can get that companies will encourage developers to enter the IoT field in order to get a larger share of the profit. This article analyzes the development of modern web applications for IoT devices. The study found that by increasing the performance that the IoT ecosystem provides, you can get a fairly high level of savings. In one of its articles, Wired described one of the most important IoT issues. It is a concept in which not all devices need to be connected to the Internet. Each device should only collect and exchange data if it is really needed. A specific purpose, based on customer utility, may be the only reason the device connects to the Internet [9]. When it comes to the Internet of Things in manufacturing, embedded sensors can improve efficiency and significantly reduce material manufacturing costs. For example, a company called Concrete Sensors uses a device integrated in concrete to monitor the condition of a material. His innovation saves customers approximately $365,000 per floor for an investment of only $30,000. Either way, connected devices need an endpoint that will retrieve, process, and display data. Mobile apps are now mainly used as endpoints for streaming music, entertaining users, or to help them interact with their friends via social media. However, mobile apps can also act as a gateway [10].
Method for calculating the protection of personal data from trust between users and the intensity of data transfer in social networks
Authors:   State University of Telecommunications, Akhramovych V. M. , Vdovychenko O. V. , Zahyney A. Yu.
Published: January 2022

A mathematical model was developed and a study of the model of protection of personal data from trust between users and the intensity of data transmission in social networks was carried out. Dependencies are considered: the amount of information flow in the social network from the components of information protection, personal data, and the speed of data flow; protection of the system from the size of the system (as well as the amount of personal data); threats to information security from loss of trust between users The resulting system of linear equations consists of an equation: the rate of change in the flow of information from the security of the social network and coefficients that reflect the impact of security measures, the amount of personal data, the speed of leakage, changes in the indicator of protection of information from trust between network users, its size, the security of personal data. As a result of the solution of the system of differential equations mathematical and graphical dependences of the indicator of personal data protection in the social network from various components were obtained. Having considered three options for solving the equation near the stationary state of the system, we can conclude that, based on the conditions of the ratio of dissipation and its own frequency of fluctuations in the value, the attenuation of the latter to a certain value is carried out periodically, with a suffocating amplitude, or exponentially fading law. A more visual analysis of the system behavior was performed, moving from the differential form of equations to discrete and to model a certain period of existence of the system. Mathematical and graphical dependences of frequency of own oscillations of the system, oscillation period, attenuation coefficient are presented. Simulation modeling for values with deviation from the stationary position of the system is carried out. As a result of simulation modeling, it has been proved that the social network protection system is nonlineable.
Mathematical modeling of dynamic related processes based on the finite element techniques
Authors:   State University of Telecommunications, Yakovenko N. D. , Storchak K. P. , Zvenigorodsky O. S. , Byelkin Yu. O. , Kitura O. V.
Published: January 2022

In the process of investigation the functioning of information systems with the help of mathematical modeling, problems can arise that are solved using finite element techniques. For example, In the present work we solved the axially symmetric dynamic problem of related phenomena under microscale thermal loading. The statement of the problem includes: Cauchy relations, equations of motion, heat conduction equation, initial conditions, thermal and mechanical boundary conditions. The nonlinear behavior of a material is described by the unified model of flow. The problem is solved numerically by the time step integration method, iterative method and finite element method. Equations of the evolution for the inelastic flow model are integrated by the second-order Euler implicit method with the use of the rule of «middle point». The system of nonlinear transcendental equations obtained in each time step is solved by the method of simple iteration. To accelerate convergence, we apply the Stephensen – Aitken procedure. The equations of motion are integrated by the Newmark method, whereas the heat-conduction equation is integrated by the first-order implicit method. The problem of heat-conduction is linearized by finding the temperature-dependent thermal characteristics according to the temperature distribution in the previous time step or previous iteration. The main results obtained in the work are the following: quantitative estimations of temperature effects of thermostructural-mechanical coupling, which are caused by volumetric thermoelastic effect, dissipation of mechanical energy and hidden heat are obtained.
Development of computer barcode detector based on one chip microcomputer
Authors:   State University of Telecommunications, Danylchenko V. M. , Sribna I. M.
Published: January 2022

The barcode technology is the technical basis for the implementation of POS systems, POS (Point of Sale) is a hardware and software complex operating on the basis of a fiscal registrar, a typical set of cash functions is fixed by the POS system: accounting and dispensing of goods, receiving and issuing money, cancellation of the fact of purchase, etc. Usually POS-computer, POS-monitor, receipt printer, fiscal registrar, POS-keyboard, customer display, cash drawer, magnetic card reader are called POS-system components. EDI (Electronic data interchange) transfer of structured digital information between organizations, based on certain standards and conventions, regulations and formats of transmitted messages. The main task of EDI is to provide a standardized exchange of transactions and other digital information, to provide opportunities for programmatic interaction between computer systems of various segments and organizations. E-commerce and supply chain management. At the same time, it is also an important technical means for modernizing logistics management. This design is based on ST89C52RC microcontroller, using YHDAAM100 barcode scan sensor to collect data, and finally display barcode data through LCD1602 liquid crystal. A liquid crystal display is an electronic device for visual display of information (display), the principle of operation of which is based on the phenomenon of the electrical transition of Fredericksz in liquid crystals. The display consists of an arbitrary number of colored or monochrome dots (pixels), and light sources or a reflector (reflector). This design realizes the scan code to function at a very low cost. The device has a small size and low power consumption. It can not only be used in portable barcode collection programs, but also has broad application prospects.
Control of Smart house sensors using Google Assistant
Authors:   State University of Telecommunications, Sverdlyuk B. I. , Kagramanova Yu. K. , Khomenchuk V. O. , Vlasenko V. O. , Polonsʹkyy K. V.
Published: January 2022

As a result of the research, a working model was created by smart home devices and the Internet of Things using a voice interface. Integrated Google Assistant, Dialogflow, PHP and MQTT. Voice interfaces are closely related not only to the use of smartphones, but also to wearable electronics, autonomous control, speaker speakers and even games. In turn, the Internet of Things today is not only a concept, but also a real movement with its technologies and protocols. Their variety and use of open technologies allows you to flexibly choose the tools for the project you need, taking into account its specifics. Smart lighting control systems are very popular because of the convenience of such solutions (remote on and off, increase and decrease brightness), the ability to collect and analyze data, the ability to make decisions depending on the ratio of external sensors and events. Google Assistant is an artificial intelligence-powered virtual assistant developed by Google that is primarily available on mobile and smart home devices. Unlike the company’s previous virtual assistant, Google Now, the Google Assistant can engage in two-way conversations. Dialogflow is a natural language understanding platform used to design and integrate a conversational user interface into mobile apps, web applications, devices, bots, interactive voice response systems and related uses. The ESP8266 is a low-cost Wi-Fi microchip, with a full TCP/IP stack and microcontroller capability, produced by Espressif Systems in Shanghai, China. The Message Queuing Telemetry Transport (MQTT) is a lightweight, publish-subscribe network protocol that transports messages between devices. The protocol usually runs over TCP/IP; however, any network protocol that provides ordered, lossless, bi-directional connections can support MQTT. It is designed for connections with remote locations where a «small code footprint» is required or the network bandwidth is limited.
Extreme Permissivism Revisited
Authors: Tokhadze Tamaz
Published: January 2022

Extreme Permissivism is the view that a body of evidence could rationally permit both the attitude of belief and disbelief towards a proposition. This paper puts forward a new argument against Extreme Permissivism, which improves on a similar style of argument due to Roger White (2005, 2014). White’s argument is built around the principle that the support relation between evidence and a hypothesis is objective: so that if evidence ???? makes it rational for an agent to believe a hypothesis ????, then ???? makes it rational to believe ????, for all agents. In this paper, I construct a new argument against Extreme Permissivism that appeals to a logically weaker, less demanding view about evidential support, Relational Objectivity: whether a body of evidence ???? is more likely if ???? is true than if ???? is false is an objective matter and does not depend on how any agent interprets the relationship between ???? and ????. Relational Objectivity is solely concerned with the conditional probabilities called likelihoods and does not put substantive constraints on an agent’s prior and posterior credences. For this reason, the presented argument avoids the standard permissivist criticism levelled against White’s argument.
Investigation of the process of surfacing and vibration deformation during the restoration of plowshares and discs of tillage machines
Authors: Marchenko D. , Matvyeyeva K. ,   Mykolayiv National Agrarian University
Published: January 2022

The analysis of ploughshare wear is given in the article and the characteristic requirements to the technological process of restoration of their worn surfaces are established. The choice of restoration technology was justified taking into account the nature of defects and the degree of wear of the working surfaces of cutting elements, their material, hardness, design parameters, accuracy of processing and cost of repairs. Quantitative and qualitative assessment of the reliability of the cutting elements of the plowshares of tillage machines, restored by different methods, was carried out by comparison with the same indicators of the new ones. Analysis of the condition of restored and new plowshares was carried out on their wear in the process of laboratory and operational tests. Laboratory researches on strengthening of plowshares by a method of vibration deformation were carried out on the specially made installation consisting of the following main knots: vibroexciter IV-105 with adjustable unbalance; hydraulic lifting systems; auxiliary equipment. The deformation rate was regulated by a V-belt double-circuit variator of the pump drive. To study the effect of normal and vibration load on the strength characteristics of the processed material, the study was performed on samples-models, and then - on the details. The samples were new plowshares, experimental studies on which provided the identity of the nature of the course of wear of their cutting elements. It is experimentally established that the hardness of the material on the surface of the blade, depending on the technological process of restoration was: restored by welding tires of steel 45 with surmaite surfacing and vibration hardening - 71-74 HRC; new plowshares made of L-53 steel, subjected to vibration hardening 66-68 HRC; new from 65G steel and strengthened by vibration deformation 57-59 HRC
Нeat and mass transfer models at boundary lubrication to determine the transition temperatures
Authors: Dykha O. , Staryi A. ,   Khmelnitskyi National University
Published: January 2022

At present, kinetic and thermodynamic methods for assessing the lubricating effect of oils are being increasingly developed. At the limit friction, the reduction of friction and wear of surfaces is due to the ability of the lubricant to form layers of adsorption or chemical origin on the surface. Analytical models of transition temperatures and wear in the limit lubrication mode must be used to mathematically describe the processes in the subsystems and the transition between them. The Fourier equation of thermal conductivity is accepted as the basic calculated dependence. It is assumed that the process of heat propagation under the conditions of formation of lubricating films is not Markovian, i.e. the magnitude of the heat flux is determined by the entire "history" of heat transfer in a certain elementary volume. The equation of motion of a lubricating film over the surface of a body that is being lubricated is obtained from the equation of motion for a Newtonian continuous medium. As a result, nonlinear heat and mass transfer models are obtained to determine the transition temperatures in the formation of boundary lubricating films in the concept of structural-thermodynamic approaches to describe the processes of boundary lubrication of surfaces
Hydrogen nitrogening in great discharge with AC power
Authors: Stechyshyna N. , Stechyshyn M. , Martynyuk A. , Gladkiy Ya. ,   Khmelnitskyi National University
Published: January 2022

The paper substantiates and experimentally shows the possibility of anhydrous nitriding in a glow discharge (BATR) with AC power supply (AC), as well as the possibility of switching the shape of pulses, changing their polarity, which is solved by introducing a glow discharge nitriding device with a power source alternating current of a given frequency. The analysis of the results of metallographic studies of the modified layer indicated the presence of a more uniform gradient of hardness in depth (gradient decreased by 1.7 - 3.5 times), which increases the wear resistance of parts and quality indicators of strengthening parts while reducing processing costs and installation costs. At BATR in CCR with supply of current of industrial frequency the installation for realization of process becomes cheaper. The latter factor will contribute, among other aspects, to the wider introduction of BATR technologies. The use of alternating current affects the course and results of nitriding, as periodic changes in the polarity of the electrodes of the chamber contributes to the cleaning of the surface from the adsorption layer, which positively affects the nature of nitrogen saturation (gradient of microhardness times), contributes to a significant change in the phase composition of the surface modified layer and allows to expand the technological capabilities of nitriding in the direction of obtaining the required performance characteristics of working surfaces, in particular tribological characteristics
Use of structural anomalies in steel gas-thermal coatings during increased wear-out
Authors:   E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Lopata V. , Chernovol M. ,   Central Ukrainian National Technical University, Solovuch E. ,   Central Ukrainian National Technical University, Dudan O. ,   Polotsk state university
Published: January 2022

The structure of gas-thermal coatings made of wire materials has been studied by determining the most efficient methods of controlling the process of structure formation to achieve the highest physical and mechanical properties of renewable surfaces of vehicle parts. The effect of formation of anomaly amount of residual austenite in sprayed steel coatings was established. Technologies of application of the “austenitic effect” is suggested here to increase a coating wear-resistance. It is determined that the main factors influencing the content of residual austenite in hardened steel are the cooling rate of steel, the concentration of alloying elements in the austenitic phase, as well as thermal stabilization of austenite during self-tempering. It is shown that to ensure the formation in the structure of sprayed coatings of alloy structural, tool and corrosion-resistant steels of metastable austenite, which has a low flow temperature of deformation gamma-alpha transformation, which corresponds to the operating temperatures of sliding friction units, it is necessary to achieve certain coating conditions. wire spraying, cooling rate of molten particles and the degree of their oxidation). One of the most probable reasons for the appearance of the "austenitic effect" in coatings is the heating of the surface layer to a temperature that promotes thermal stabilization of austenite, as well as saturation of melt droplets with alloying elements (primarily chromium) and impurities (carbon, nitrogen) in flames. The relatively low flight speed of molten steel particles and the high concentration of propane containing carbon in the combustion products contribute to the deep saturation of the melt droplets with carbon. It is likely that these circumstances are associated with a high content of residual austenite in the coatings obtained by gas-flame spraying. An additional factor that increases the resistance of austenite in the sprayed coating may be the saturation of the droplets of the melt with carbon during melting and spraying using a propane flame. The studies under discussion have suggested that both for the method of gas-flame spraying and for the method of electric arc spraying, there are modes and steels for spraying that allow the formation of large amounts of metastable austenite in coatings, which in the process of tribocoupling will turn into martensite.On the basis of the carried-out researches technologies of restoration of details of vehicles by drawing multipurpose coverings in which the choice of a method of heating of a wire at spraying is carried out depending on temperature of the beginning of martensitic transformation of a wire material are offered.
The selection and development of tribological coating
Authors:   East Ukraine National University, Kharlamov Y. , Lopata L. ,   G. S. Pisarenko Institute for Problems of Strength of the National Academy of Sciences of Ukraine, Brusilo Y. ,   National Aviation University, Holovashuk M. ,   National Transport University
Published: January 2022

The strategy and methodology for selecting of optimal surface treatment for a given tribological application are the main objectives of study. The classification of main methods of coating processes and surface modification is given. The scheme of development of operation technology of surface treatment and coating deposition is proposed. The main initial data: the structure of tribological system (TrS); individual properties of TrS parts; lubricant properties; method of lubrication of TrS parts; properties of sur­rounding environment; external influences on TrS; technological limitations on TrS parts treatment; managerial and economical limitations. The selection of surface technology method is including the next successive steps: the preliminary analysis of TrS part interaction; development of models of friction and wear process of TrS parts; the choice of rational values of parameters of surface layers of TrS parts; the choice of rational composition and structure parameters of surface layers of TrS parts; the choice of rational technological route and methods of surface treatment of TrS parts; the experimental examination of surface strengthened materials and TrS and correction of surface treatment technology
KONTEKSTUALITAS PEMBELAJARAN MATEMATIKA KELAS IV SD
Authors: Awang Imanuel Sairo , Ardianti Fransiska Fatmawati , Rismawati Melinda
Published: January 2022

Abstrak. Tujuan penelitian ini adalah untuk mendeskripsikan pelaksanaan pembelajaran kontekstual pada pembelajaran matematika siswa kelas IV SD Negeri 11 Jerenjang tahun pelajaran 2019/2020. Penelitian ini merupakan penelitian deskriptif kualitatif. Subjek penelitian adalah guru kelas IV dan 3 orang siswa kelas IV. Alat pengumpulan data yang digunakan adalah pedoman wawancara dan dokumen. Hasil penelitian menunjukkan 1) pelaksanaan pembelajaran kontekstual sudah terlaksana dengan baik dan sesuai dengan komponen yang ada pada pembelajaran kontekstual; 2) media yang digunakan pada materi pecahan menggunakan kertas berbentuk persegi panjang, pada materi KPK dan FPB menggunakan kertas HVS, kertas manila, dua origami berwarna hijau dan merah yang berbentuk lingkaran kecil, dan pada materi pengukuran panjang dan berat menggunakan timbangan yang tersedia di sekolah, timbangan badan, dan penggaris; dan 3) Respon siswa terhadap pembelajaran kontekstual yaitu siswa merasa senang, merasa tertarik dan merasa lebih mudah memahami materi pelajaran.Kata kunci: Kontekstual, Matematika, Pembelajaran
Penerapan Media Pembelajaran E-Learning Berbasis Google Sites Terhadap Hasil Belajar Matematika Siswa
Authors: Hadidi Hadidi , Setiawan Beni
Published: January 2022

Penelitian ini bertujuan untuk mengetahui bahwa penerapan media pembelajaran e-learning berbasis google sites ditinjau dari hasil belajar matematika siswa SMP Negeri 4 Sintang kelas VIII pada materi bangun ruang sisi datar. Penelitian ini adalah penelitian eksperimen, yang dilakukan pada siswa kelas VIIIA sebagai kelas eksperimen menggunakan media web berbasis google sites dan VIIIB sebagai kelas kontrol menggunakan group whatsapp di SMP Negeri 4 sintang, semester 2 tahun ajaran 2020/2021. Metode yang digunakan dalam penelitian ini adalah penelitian Quasi Eksperiment. Adapun teknik pengumpulan data penelitian dengan menggunakan tes. Instrumen yang digunakan adalah tes hasil belajar dengan menggunakan soal sebanyak 15 soal pilihan ganda dan angket respon untuk melihat respon siswa terhadap media web berbasis google sites. Hasil penelitian ini ditinjau dari perhitungan pretest dan posttest dari kedua kelas yakni kelas eksperimen dan kelas kontrol. Hasil pretest menunjukkan bahwa kedua kelas memiliki kemampuan awal yang tidak jauh berbeda dilihat dari nilai rata yakni 57,26 dan 54,60. Sedangkan pada posttest hasil belajar menunjukkan bahwa kedua kelas memiliki kemampuan tes akhir dimana nilai rata kelas eksperimen sebesar 54,18 sedangkan kelas kontrol sebesar 29,13
Perbandingan Antara Model Pembelajaran Learning Cycle 7E Berbantuan Media Pembelajaran Power Point, Geogebra, dan LKS Terbimbing Terhadap Kemampuan Representasi Matematis Siswa Di SMPN 2 Pamijahan Bogor
Authors: Komariah Lilis , Salsabila Ellis , Wiraningsih Eti Dwi
Published: January 2022

Penelitian ini bertujuan untuk mengetahui perbandingan kemampuan representasi matematis antara siswa yang belajar menggunakan model antara model pembelajaran learning cycle 7E berbantuan media pembelajaran power point, GeoGebra, dan LKS terbimbing. Metode penelitian yang digunakan adalah quasi experiment dengan pengambilan sampel cluster random sampling. Sampel penelitian dipilih tiga kelas dari kelas VIII di SMPN 2 Pamijahan Bogor tahun ajaran 2019/2020 yang berdistribusi normal dan homogen. Kelas ekperimen I yaitu kelas VIII-7 mendapatkan perlakuan  model pembelajaran learning cycle 7E berbantuan media pembelajaran Power Point, kelas eksperimen II yaitu kelas VIII-6 mendapatkan perlakuan model pembelajaran learning cycle 7E berbantuan media pembelajaran GeoGebra, sedangkan kelas eksperimen III yaitu kelas VIII-1 mendapatkan perlakuan model pembelajaran learning cycle 7E berbantuan media pembelajaran LKS terbimbing. Masing-masing kelas eksperimen memiliki jumlah siswa yang sama yaitu 37 siswa. Hasil dari penelitian ini menyatakan bahwa kemampuan representasi matematis siswa yang belajar menggunakan model learning cycle 7E berbantuan media pembelajaran power point lebih tinggi dibanding kelas berbantuan media pembelajaran GeoGebra dan LKS terbimbing, serta kemampuan representasi matematis siswa yang belajar menggunakan model learning cycle 7E berbantuan media pembelajaran GeoGebra lebih tinggi disbanding berbantuan media pembelajaran GeoGebra dan LKS terbimbing
Pengembangan Modul Elektronik Matematika pada Bahasan Eksponensial dan Logaritma Menggunakan Pendekatan Saintifik
Authors: Wisnu Kartika Rafiqa Nabila , Sampoerna Pinta Deniyanti , Wiraningsih Eti Dwi
Published: January 2022

Tujuan dari penelitian ini adalah mengembangkan modul elektronik matematika pada pokok bahasan eksponensial dan logaritma dengan menggunakan pendekatan saintifik pada kelas X SMA. Metode penelitian ini merupakan penelitian dan pengembangan (research and development) dan menggunakan model pengembangan Borg and Gall yang melibatkan lima Langkah, yaitu (1) melakukan analisis produk yang akan dikembangkan, (2) mengembangkan produk awal, (3) validasi ahli dan revisi, (4) uji coba lapangan skala kecil dan revisi produk, dan (5) uji coba lapangan skala besar dan produk akhir. Penelitian dilakukan pada Desember 2020 di SMA IT Al-Halimiyah. Berdasarkan hasil validasi modul elektronik matematika oleh ahli materi dan bahasa diperoleh persentase secara keseluruhan aspek sebesar 84,19% serta validasi ahli media 81,30%. Kemudian, menurut hasil evaluasi guru diperoleh persentase keseluruhan aspek sebesar 89,57%. Pada uji coba lapangan skala kecil diperoleh hasil 94,90% untuk persentase secara keseluruhan. Serta ketika uji coba lapangan skala besar diperoleh persentase sebesar 88,31%.
Kemampuan Siswa Dalam Menulis Puisi Himne Menggunakan Media Gambar Pada Siswa Kelas VIII SMP Negeri 06 Satu Atap Pinoh Selatan
Authors: Beding Valentinus Ola , Seran Eliana Yunitha , Dino Dino
Published: January 2022

Adapun tujuan penelitian ini adalah untuk mendeskripsikan bagaimana peningkatan kemampuan menulis puisi siswa dengan menggunakan media gambar. Metode penelitian yang digunakan dalam penelitian ini adalah kualitatif dengan bentuk penelitian Tindakan Kelas (PTK). Teknik pengumpulan data menggunakan teknik komunikasi tidak langsung, teknik pengukuran, dan dokumentasi, dengan alat pengumpul data berupa lembar observasi, soal tes dan dokumen sedangkan teknik analisis data yang digunakan adalah teknik analisis kritis dan interaktif. Hasil penelitian (1) penerapan media gambar berdasarkan pelaksanaan penelitian, hasil observasi, dan hasil wawancara tentang menulis puisi dengan menggunakan media gambar pada siswa kelas VIII SMP Negeri 06 Satu Atap Pinoh Selatan dapat dikatakan baik dan media gambar dapat diterapkan. Hal tersebut dapat dilihat dari hasil observasi bahwa siswa dapat menulis puisi himne dengan menggunakan media gambar, (2) peningkatan berdasarkan ketuntasan belajar siswa mulai dari siklus I sampai siklus II, pada siklus I ketuntasan belajar siswa adalah 60% dan pada siklus II mengalami peningkatan yang signifikan menjadi 90% sehingga terjadi peningkatan sebesar 30%, (3) respon siswa dalam pembelajaran bahwa siswa senang dengan menggunakan media gambar, hal ini tampak dari kegiatan belajar mengajar yang baik. Dimana siswa antusias saat mengikuti proses pembelajaran dan merespon kegiatan pembelajaran selama pembelajaran berlangsung. Kata Kunci: Kemampuan Menulis Puisi, Media Gambar
MENINGKATAKAN PROFESIONALISME GURU DALAM PROSES PEMBELAJARAN MELALUI SUPERVISI KLINIS
Authors: Natalia Natalia
Published: January 2022

Penelitian ini dilaksanakan di SD Negeri 19 Kebah. Pelitian dilkaukan dengan motede Penelitian Tindakan Sekolah (PTS) yang terdiri dari dua siklus. Pada siklus I ini, guru  sudah mulai faham dan mampu mengajar di kelas dan tergolong maksimal karena skor yang di dapat dari hasil observasi adalah 53 dan Skor Rata-rata 9,2 dengan kriteria Skor maksimal tiap guru: 3X 4= 12 Skor maksimal semua guru  12 X 6= 72 yang berarti Profesionalisme guru dalam proses pembelajaran sudah sangat baik. Pada siklus II ini, guru  sudah mampu mengajar di kelas dan sudah maksimal karena skor yang di dapat dari hasil observasi adalah 89 dengan kriteria Skor maksimal tiap guru: 3X 4= 12 Skor maksimal semua guru  12 X 6 = 72 yang berarti kemampuan guru dalam mengajar di kelas baik.  Pada siklus II juga, kepala sekolah mengadakan observasi terhadap Profesionalisme guru dalam proses pembelajaran, hasil yang di peroleh pada siklus II mencapai skor 65 dan skor rata-rata mencapai 11 artinya Profesionalisme guru dalam proses pembelajaran sudah sangat baik. Kata kunci: Profesionalis Guru, Supervisi KlinisPenelitian ini dilaksanakan di SD Negeri 19 Kebah. Pelitian dilkaukan dengan motede Penelitian Tindakan Sekolah (PTS) yang terdiri dari dua siklus. Pada siklus I ini, guru  sudah mulai faham dan mampu mengajar di kelas dan tergolong maksimal karena skor yang di dapat dari hasil observasi adalah 53 dan Skor Rata-rata 9,2 dengan kriteria Skor maksimal tiap guru: 3X 4= 12 Skor maksimal semua guru  12 X 6= 72 yang berarti Profesionalisme guru dalam proses pembelajaran sudah sangat baik. Pada siklus II ini, guru  sudah mampu mengajar di kelas dan sudah maksimal karena skor yang di dapat dari hasil observasi adalah 89 dengan kriteria Skor maksimal tiap guru: 3X 4= 12 Skor maksimal semua guru  12 X 6 = 72 yang berarti kemampuan guru dalam mengajar di kelas baik.  Pada siklus II juga, kepala sekolah mengadakan observasi terhadap Profesionalisme guru dalam proses pembelajaran, hasil yang di peroleh pada siklus II mencapai skor 65 dan skor rata-rata mencapai 11 artinya Profesionalisme guru dalam proses pembelajaran sudah sangat baik. Kata kunci: Profesionalis Guru, Supervisi Klinis