System technologies <p>&nbsp;<span style="font-size: small;"><a title="System technologies" href=""><img src="/public/site/images/editor_journals/logo_new_black_font4.png"></a></span></p> <p style="margin-top: 0.00in; margin-bottom: 0.00in; font-weight: normal; line-height: 100%;" align="justify"><span style="font-size: small;"><strong>The journal</strong></span></p> <p style="margin-top: 0.00in; margin-bottom: 0.00in; font-weight: normal; line-height: 100%;" align="justify"><span style="font-size: small;">Regional interuniversity compendium of scientific works "System technologies" was established in January 1997, is published 6 times per year. </span><span style="font-size: small;"><span style="font-weight: normal;"><span class="tlid-translation translation" lang="en"><span class="" title="">According to the order of the Ministry of Education and Science of Ukraine No. 1643 dated December 28, 2019, the regional intercollegiate collection of scientific works "System Technologies" is included in the List of scientific professional publications of Ukraine, category "Б".</span></span></span></span></p> <p style="margin-top: 0.00in; margin-bottom: 0.00in; font-weight: normal; line-height: 100%;" align="justify"><span style="font-size: small;"><span style="font-weight: normal;"><span class="tlid-translation translation" lang="en"><span class="" title="">Knowledge area is technical sciences.</span></span></span></span></p> The National metallurgical academy of Ukraine en-US System technologies 1562-9945 Pre-processing of the x-ray to increase the sensitivity of visual analysis <p>In the field of medical imaging, it is fundamental to improve medical images of different physical nature to increase the likelihood of diagnosis based on them. X-rays are one of the oldest techniques used to analyze dense tissue abnormalities. Insufficient quality of X-rays is due to both the physical characteristics of the equipment used and the process of their for-mation. There are two main approaches to digital image processing - spatial methods, which are based on direct manipulation of the pixels of the original image and frequency conversion methods. These image processing methods consider pixel values as exact constants, while there are objective reasons for the presence of digital uncertainties, which are due to loss of information when displaying objects from three-dimensional (3-D) space, to 2-D projections, uncertainty of the gray level, statistical randomness, etc. To account for these factors, new methods are currently being developed that are based on the ideas of ambiguity. This approach is a kind of nonlinear transformation that allows you to take into account factors that are ambiguous. Fuzzy methods are based on mapping gray brightness levels to a fuzzy plane using membership transformations. The image is represented as a mass of fuzzy sets relative to the analyzed property with the value of the membership function that varies in the range [0-1]. The aim of this article is to assess the impact on the quality of the bright characteristics of the X-ray image of the results of using a combination of spatial methods of histogram equalization, fuzzy intensification and improvement in the frequency domain. The proposed algorithm provides a redistribution of the brightness of the histogram in the middle range of gray levels, which corresponds to the best visual (according to Weber - Fechner's law) per-ception, allows to increase the contrast and resolution of the image. There is a significant effect on the result of improving the image of the parameters of fuzzy intensifications. Experimental results are given on the example of real images.</p> L. Akhmetshina A. Knysh S. Mitrofanov Copyright (c) 2022 2022-04-08 2022-04-08 3 140 3 12 10.34185/1562-9945-3-140-2022-01 Simulation of the SiGe use effi-ciency for the production of high-voltage thyristors <p>Power semiconductor devices often subjected to appreciable terrestrial atmospheric neutron flows. For the improvement of their radiation hardness, the use of silicon doped with Ge (SiGe) was proposed. The stability of last is much higher in comparison with convenient type silicon. Earlier received results confirmed effectiveness of isovalent doping of silicon with germanium at radiation tests of low power (current approx. 100 mA) discrete devices. Power thyristors Т122-25 are used for the transformation and regulation of AC and DC current up to 25А, frequency up to 500 Гц in the circuits with voltage 100 – 1600V (1-16 class). In the data sheets directly indicated that these devices are not suitable for operating in the conditions of ionizing radiation. Therefore, the main practically important mission of the article was the confirmation the technological efficiency of SiGe use, or, in other words, possibility of radiation hard material use for high voltage power devices technology. The purpose of the present work was the modeling of the experimental findings for the informed choice of Ge concentration for manufacturing of high voltage thyristors Т122. The data concern the workable general-purpose power thyristors Т122 type yield, manufactured in accordance with the identical technology, based on CZ-Si и CZ-Si. At SiGe implementation in the technology of power semiconductors was observed no monotonic change of the thyristors gain share for devices of high (10, 11, 12) ranges (classes), the value of pulse recurring voltage in off-state is 1000, 1100 and 1200 V. Simulation of the experimental results was performed in MathCAD. The concentration of Ge, suitable for the manufacture of high-voltage thyristors, is in the range 2 ·1019 - 1·1020 cm-3, i.e. in the linear region of dependence. Previously, the authors have experimentally shown the possibility and mechanism of increasing the radiation resistance of SiGe with a concentration of Ge 5·1019 cm-3. It is allowed to admit the possibility of reaching the radiation resistance of high-voltage power discrete thyristors when tested with γ-quanta in the dose range up to ≅ 3·106 mSv.</p> S. Bytkin T. Krytskaja Copyright (c) 2022 2022-04-08 2022-04-08 3 140 13 23 10.34185/1562-9945-3-140-2022-02 Using the "minimum risk" method in the technical diagnosis of metallurgical equipment <p>The difficult operating conditions of metallurgical equipment due to dynamic loads require special attention when designing components in the field of reliability and fail-free operation. In order to increase the reliability and durability of the spindle drive unit of the rolling stand of the hot rolling mill "1680", it is proposed to switch from "oil mist" type lubrication systems to "oil-air" type systems for bronze liners and bearings of the balancing mechanism. The oil-air lubrication principle has undeniable advantages in terms of component lubrication, flow distribution, and provides a volumetric flow of oil by injecting air into each bearing of the equipment, guaranteeing an accurate volume at each lubrication point, regardless of bearing back pressure, atmospheric pressure, temperature and oil viscosity . In order to optimize decision-making when designing new components and parts of metallurgical equipment, the vector of making reliable design decisions is increasingly shifting towards mathematical modeling of production processes and situations that arise during the performance of technological operations. It has been established that in order to determine the permissible value of the content of wear products in the form of metal shavings, one can use the general theory of recognition, which is an important section of technical cybernetics and deals with the recognition of images of any nature, namely, the "minimal risk" method. Recognition algorithms are partly based on diagnostic models that establish a connection between the state of a technical system and diagnostic signals coming from these systems. The performed calculations make it possible to accurately establish the limiting values of iron-containing impurities in the working fluid of the "oil-air" lubrication system and indicate that if the limit value x0 = 11 is exceeded, that is, if the content of iron-containing impurities in the working fluid is more than 11 g per 100 cm3, the object should be stopped for inspection and the working fluid should be cleaned by filtration. The possibility of determining the permissible value of the content of wear products in the form of metal shavings in "oil-air" lubrication systems using the general theory of recognition, namely the "minimal risks" method, which simplifies the process of setting the date of its cleaning by filtration, without burdening it with especially cumbersome formulas and calculations.</p> O. Hrechanyi T. Vasilchenko A. Vlasov S. Fedorenko D. Syniavskyi Y. Tsehelnyi Copyright (c) 2022 2022-04-08 2022-04-08 3 140 24 34 10.34185/1562-9945-3-140-2022-03 Development of self-learning intelligent decision support system to control of steel production technological processes <p>Taking to the consideration the current state of converter production and measuring equipment at Ukrainian enterprises, it follows that the smelting process is based on a complex dynamic non-deterministic system. The process is complicated by the large number of param-eters, the inability to accurately identify the state of the system at any time, as well as the dif-ficulty of forecasting system requirements. Preliminary analysis has shown that in the conditions of this production converter manufacturing efficiency increase can be reached at the expense of: - reducing the cost of raw materials, such as iron-containing additives, deoxidizers, non-metallic elements in steel; - reduction of melting time, especially blowing time; - reducing defects and improving product quality. It is proposed the architecture of integrated control DSS in converter steel production based on the principle of minimal interference in the production process. The primary aim of such a system is to predict the behavior of the production process, providing the recommen-dations for its impact in order to optimize the external criterion of efficiency. The source and amount of data required for the database formation and DSS knowledge base are substantiated. The mechanism of self-learning in the course of technological tasks is described. The structural scheme of self-learning DSS, self-learning algorithm, which is mainly featured with modularity, is offered in the paper. The approach allows testing of any number of existing algorithms for learning, forecasting and optimization in order to further select the most effective ones, modifies the system in the future and allows the parallel use of a number of com-peting algorithms. The operator has the opportunity to choose as a control solution one of the proposed systems, or the formation of its own, better by a certain external criterion of result quality. Based on the suggested software structure, a number of tasks are formulated that need to be performed to build a decision support system. It is also considered to apply the mathematical apparatus of fuzzy sets to describe certain pa-rameters of the technological process and quality criteria, fuzzy neural network for modeling reasoning processes and the choice of algorithm for its training.</p> I. Ziborov T. Zheldak Copyright (c) 2022 2022-04-08 2022-04-08 3 140 35 46 10.34185/1562-9945-3-140-2022-04 Open Satellite Data for Global Greenhouse Gas Monitoring <p>Open satellite concentration data for the main greenhouse gases (CO2, CH4, N2O) are considered in terms of their possible use for local, regional, and global monitoring. The main data characteristics are provided. The satellite products most suitable for global monitoring of greenhouse gas concentrations are specified. The disadvantages of existing satellite data are analyzed.</p> O. Kavats D. Khramov K. Sergieieva V. Vasyliev Copyright (c) 2022 2022-04-08 2022-04-08 3 140 47 59 10.34185/1562-9945-3-140-2022-05 Mathematical model of closed irrigation system as an object of control <p>Irrigation machines of the Frigate series are mainly used in closed irrigation systems in the south of Ukraine. During the operation of such systems there are problems with pressure control in the system, the problem of remote control of irrigation. A possible solution to these problems is to control the pressure in the water supply line of sprinklers, by automatically controlling the pumping equipment and installing appropriate sensors (pressure, flow meters, etc.) for feedback to the control system. By controlling the pumping equipment that creates pressure in the mains, it is possible to ensure proper modes of operation in the water supply mains of the DMU. Appropriate software for statistical data collection and management is also needed to improve watering and remote monitoring of the system. The aim of the study is to build a mathematical model of a closed irrigation system as an object of management, which will analyze the processes occurring in the system and evaluate the effectiveness of management methods being developed. The article considers the scheme of relationships between the main components of a closed irrigation system such as pump unit, distribution and irrigation pipeline, shut-off valves, universal sprinklers, control system with further mathematical description of each component. The main parameters of the system that affect its operation are identified. Set quality indicators that are put forward to the control system. The system as an object of control is analyzed, input, output and internal parameters of the system are revealed. The mathematical model of ZSS is built from the considered models of components, gives the chance to analyze the processes proceeding in system, and to estimate efficiency of the management methods developed. To determine the adequacy of the mathematical model, which is created by the proposed approach, it is advisable to simulate the operation of the ZSS for real conditions in different modes of operation. To determine the properties of ZSS as an object of control, such as inertia, controllability, stability, observation, it is necessary to obtain a model of the complex in the space of states.</p> S. Karpenko H. Rudakova Copyright (c) 2022 2022-04-08 2022-04-08 3 140 60 70 10.34185/1562-9945-3-140-2022-06 Features of teaching the course of study "Software tools for creating server web applications" <p>Modern technologies for creating and maintaining web applications are focused on platforms that allow you to effectively manage the content and data coming from visitors. One of the popular technologies for creating web pages with code snippets running on a server is PHP (Personal Home Pages). This technology is based on the use of CGI applica-tions that interpret embedded HTML page code in a scripting language. The main feature of the PHP language is its practicality. PHP provides the programmer with a tool to quickly and efficiently solve problems. It is characterized by exceptional flexibility to the needs of the de-veloper. When teaching the course of study "Software tools for creating server-side web applica-tions" the main attention is paid to the study of PHP language. Students are also introduced to the SQL language and the MySQL database management system. A separate topic is the study of AJAX technology. The AJAX-based approach allows you to increase the intensity of data exchange between the user and the server application, thereby reducing server downtime and, most importantly, improve the friendliness of the interface. Due to the asynchronous interaction of the interface with the server part, the user opens up new facets of convenience. Several lectures are devoted to the basics of information security. Web application in-formation security threats (cross-site scripting (XSS), SQL injection, CRLF attack, XXE, CSRF, DDoS attack), ways to prevent the above threats; search for web resource vulnerabilities, security analysis tools web applications. During the lectures, attention is paid to the correct structure of sites, taking into account the principles of SEO and the basic principles of Usability - a qualitative assessment of the sim-plicity and comfort of working with the site. Thus, the educational course "Software tools for creating server web-applications" is designed to teach students to develop their own sites and web-applications and use them in professional activities. Prospects for further improvement of teaching the course of study we see in the supplemented with modern material on web-technologies that are developing rapidly.</p> N. Matveeva Copyright (c) 2022 2022-04-08 2022-04-08 3 140 71 78 10.34185/1562-9945-3-140-2022-07 Study of the combined variant of determination of attacks using neural network technologies <p>The modern world is impossible to imagine without computer networks: both local and global; therefore, the issue of network security is becoming increasingly topical. Currently, methods of detecting attacks can be strengthened by using neural networks, which confirms the relevance of the topic. The aim of the study is a comparative analysis of the quality parameters of network attacks using a combined variant consisting of different neural networks. As research methods used: neural network; multilayer perceptron; Kohonen's self-organizing map. The software implementation of the Kohonen self-organizing map is carried out in Python with a wide range of modern standard tools, creation of a multilayer perceptron and a fuzzy network - using Neural Network Toolbox packages, and Fuzzy Logic Toolbox system MatLAB. On the created neural networks separately and on their combined variant researches of parameters of quality of definition of network attacks are carried out. It was determined that the error of the first kind was 11%, 4%, 10% and 0%, the error of the second kind - 7%, 6%, 9% and 6% on the fuzzy network, multilayer perceptron, self-organizing Kohonen map and their combined version, respectively, which proves the feasibility of using the combined option.</p> V. Pakhomova A. Vydish Copyright (c) 2022 2022-04-08 2022-04-08 3 140 79 86 10.34185/1562-9945-3-140-2022-08 Calculation of the sizes of the overflow part of ingots from steels 40ХЛ and Х12МЛ at application of gas-dynamic influence and electroslag heating <p>The results of analytical research on the use of methods for calculating the size of inflows of cylindrical casts from steels 40ХЛ and Х12МЛ weighing 200 - 16000 kg and a diameter of 0.25 - 0.7 m, hardening in metal form (mold) in electroslag heating of the melt and creating atmospheric gas pressure in the overflow part. Schemes of construction of the corresponding device and realization of technology are resulted. The use of the refrigerator design in the form of a metal housing with an insert of refractory material, graphite electrodes and a flux insert, which works on the principle of floating filling insert in the combined technology of gas-dynamic impact and electroslag heating, allows more efficient use of melt casting ingot by keeping the metal in a liquid state throughout the curing time of the main mass of the casting (ingot), thereby reducing the amount of melt required to feed the shrinkage and, accordingly, the mass of the overflow. This is especially true for alloy products that contain high-cost base components and / or alloys. It is also an urgent task to be able to determine the size of a particular filling when using technology for castings of different weights and sizes in the most convenient way without the implementation of cumbersome calculation schemes. It is shown that the peculiarity of determining the size of overflows of castings made using combined technology is to take into account changes in the size of the insert of refractory material (especially wall thickness), which occupies a certain share of the overflow part of the cast or ingot, which, in turn, will change the size of the filling. Calculations and nomograms for determining the height of the filling by its diameter and the mass of casts at the ratios of the diameters of the casting and filling 0.6, 0.65 and 0.7.</p> V. Selivorstov T. Selivorstova K. Zelenskyi L. Ivanova Copyright (c) 2022 2022-04-08 2022-04-08 3 140 87 103 10.34185/1562-9945-3-140-2022-09 Models and procedures for classification and forecasting of nondeterministic processes according to chaotic dynamics parameters <p>The article investigates the processes of classification, modeling and short-term prediction of nondeterministic time sequences, which are represented by antipersistent time series (ATS). The subject of analysis - procedures for classification and forecasting the pa-rameters of such models. The object of research is the processes of modeling and analysis of parameters of nondeterministic time series of ATS with a uniform step. The aim of the work is to increase the efficiency and accuracy of methods and algorithms for classification, modeling and forecasting of ATS. Models and methods of fractal analysis are used to study the properties of ATS, on the basis of which the categories of processes of numerical series are established. With the help of aggregation of ATS levels correct mathematical models of classification of nondeterministic time sequences are developed, and also algorithmic and software means of their realization are formed. Examples of models of numerical series obtained using the aggregation procedure presented in the study are given. It is established that the most detailed and stable is the classification of ATS based on data aggregation schemes without level crossing. The comparative analysis of numerical efficiency of algorithms of classification of ATS is carried out and the task of formation of procedures of interpolation and short-term forecasting of ATS is realized. An instrumental software environment is presented, which provides a correct study of algorithms for modeling and classification of antipersistent time series. Recommendations on the procedures for modeling ATS classification algorithms are of practical importance.</p> V. Skalozub V. Horiachkin I. Klimenko D. Shapoval Copyright (c) 2022 2022-04-08 2022-04-08 3 140 104 123 10.34185/1562-9945-3-140-2022-10 Development of a parametric model of a building of the educational institution in the OpenSCAD system <p>Not so long ago, the production of master models and prototyping was a complex and difficult process, prototypes were made by hand on the basis of complex developments and drawings. Now, with the advent of 3D technology, these processes have become much simpler and much more efficient. 3D modeling plays an important role in the life of modern society. 3D graphics are widely used in marketing, architecture, design and many other areas. 3D modeling is a limitless possibility. Three-dimensional models, animation, visualization - a generalized, but far from complete list of possibilities. 3D modeling allows you to create a prototype of a future building, a commercial product in three-dimensional format, printed on a 3D printer. The use of three-dimensional models of real objects is an unusual and interesting means of transmitting information, which can significantly increase the effectiveness of the presentation. OpenSCAD software was selected to perform the work. This open 3D modeling program allows the designer to model quite complex and accurate 3D models and parametric structures that can be easily adjusted by changing the parameters, the simulation itself is based on a program written in OpenSCAD. Therefore, the topic of the work "Development of a parametric model of a building of the educational institution in the OpenSCAD system" is relevant. The purpose of this work is to develop a parametric model of the building of the Ukrainian State University of Science and Technology using the OpenSCAD system.</p> M. Uzlova A. Zhurba V. Zhuravlev H. Larionov Copyright (c) 2022 2022-04-08 2022-04-08 3 140 124 142 10.34185/1562-9945-3-140-2022-11 Research of methods of distribution of graphic objects on websites for assessment of interface quality <p>Formulation of the problem. An actual problem when creating web resources is the test-ing of the designed design, which is the direction of testing the user interface. This paper con-siders ways to automate the analysis of the interface of web pages in terms of visual perception of man. The aim of the work. The aim of the work is to improve the quality of automated testing of the graphical user interface based on the use of methods of analysis of color digital images and detection of graphic objects. Methods of selecting objects on digital images. The traditional method of segmentation is described – threshold binarization, which results in a binary image. The JSEG algorithm is more advanced. According to this method, instead of estimating the parameters of the texture model, the homogeneity of each image fragment is checked, which leads to a reduction in the amount of computation. Website interface evaluation methods. In order to qualitatively evaluate the user interface, it is necessary to identify the basic principles on which designers rely when designing interfaces. Basic principles of interface construction: shape, size, brightness, color, direction, location. Determining the brightness characteristics of the image. To estimate the brightness pa-rameters, you can use the estimation of the image histogram, which displays the brightness value. The optimal type of brightness histogram is the normal distribution. Determining the number of primary colors in the image. Performed by constructing a histogram for an indexed image on a given color map. It is optimal to use no more than 3 primary colors. Selectionobjects in the image. The methods of image segmentation described above are implemented and the imperfection of these methods is shown. The application of the JSEG algorithm gave a more positive result, but requires additional adaptation to our tasks. Conclusions. The study and comparative analysis of digital image processing methods to automate the process of assessing the quality of the graphical user interface. It is concluded that the application of the classical approach to image segmentation did not give the desired result for image analysis of web pages, namely there are problems of inability to separate adjacent graphics at the threshold binarization, and combine text characters into one block. The JSEG algorithm includes color quantization and spatial segmentation operations, due to which the result of object selection is better, but still requires further settings.</p> V. Tsaryk V. Hnatushenko Copyright (c) 2022 2022-04-08 2022-04-08 3 140 143 154 10.34185/1562-9945-3-140-2022-12 Method of own forms for determination of separate bands <p>The problem of determining the separate bands of the phosphor photoluminescence spectrum described by the Gaussian function is solved by the method of decomposition into its own forms. This allows you to calculate two parameters of each band: amplitude and variance. An example is the photoluminescence spectrum of a ZnS:Mn single crystal. It consists of five separate bands. Two systems of fifth-order equations linear for one parameter of each band are obtained. This parameter is generalized and is equal to the product of the amplitude and the root of the variance. The coefficients of these systems depend on the second parameter. This non-linear parameter is related to variance. In order to simplify the two systems, the problem is solved in several stages. Based on the analysis of literary sources, the two largest bands are selected. In addition, the origin of coordinates is well chosen. This allows us to simplify both systems and completely determine the parameters of each of the largest bands from the systems of second-order equations. As a result of these simplifications, the order of the two systems and the parameters of the other three bands are reduced. Thus, the problem is reduced to solving a system of the second and third order nonlinear equations.</p> A. Morozov Copyright (c) 2022 2022-04-08 2022-04-08 3 140 155 162 10.34185/1562-9945-3-140-2022-13 Automated system for regulating the thermal parameters of cord heat treatment furnaces with optimization of the gas-to-air ratio at a certain value <p>The system of automation which allows to control autonomous use of gas with preserva-tion of quality of technological process is resulted. The given algorithm, corresponding programs, technical means of automation system carry out regulation of air expenses at any values of quantity of fuel (gas). The gas-to-air ratio is determined experimentally from the analysis of exhaust gases for a specific type of furnace. The control algorithm is implemented using a microprocessor controller, and includes: PID control - law (proportional-integral-differential), linearization, which processes the input values of gas and air and reduces measurement errors of flow sensors and especially in the initial part of the sensor range; piecewise linear approximation, which allows: to implement the specified dependence of the ratios, flexibility and the ability to adjust and change the parameters of the control circuits, which adapts the control system to specific production conditions. The controllers can be configured both at the lower level of the distributed ACS TP and communicate with the upper level through the digital serial communication channel, and used as a stand-alone device. The meter of the measured and calculated parameters of the corresponding physical quantities displays them on the matrix board of its front panel. A computer with a printer located on the panel shop is connected to the meters. Devel-oped programs that implement control algorithms written in Delphi 3.0 using BDE (Bor-landDatabaseEnqine). Technological programs and a set of documentation for the operation of the system have also been developed. The system is focused on daily work in conjunction with meter gauges. Instrument read-ings are taken at intervals of one to one hundred and twenty minutes, depending on the settings made on the front panel. Information from the meters is stored in the database "Infoterm.db", as well as in the archival database "Archive.db". Moreover, the database "Infoterm.db" is released from the data every day before the launch of system programs. The technological program for heat meters is made on the basis of preliminary calcula-tions of measuring diaphragms from the manufacturer with observance of metrological and technological conditions (metrological certification, etc.). If necessary, the software is configured.</p> V. Ignatkin M. Gorbiychuk V. Dudnikov O. Yushkevich V. Bolonny V. Tikhonov Copyright (c) 2022 2022-04-08 2022-04-08 3 140 163 180 10.34185/1562-9945-3-140-2022-14 Micro-X-ray spectral determination of the chipboard dust samples elemental composition <p>The paper determines the composition of dust from electrostatic precipitators of EAF gas cleaners during long-term storage in dumps in order to obtain information on classifying dust as hazardous waste. Determination of the heavy metals content in waste was performed by atomic absorption flame spectrophotometry on an AAS-1N spectrophotometer. The content of the amount total iron and the determination of its various oxidation states was carried out by redox titration with potassium bichromate in an acidic medium. A comprehensive metallo-graphic study of dust samples included macroanalysis (at x16 magnification), microanalysis of the structure of the end section of pellets from fresh dust from EAF electrostatic precipitators using optical microscopy (x 50, x 500). A detailed analysis of the microstructure of the selected samples was carried out using a JSM-6490 scanning electron microscope in the mode of secondary elastically scattered electrons. The X-ray spectral analysis of the selected samples was carried out using energy and wave spectrometers attached to a JSM-6490 scanning electron microscope. Chemical analysis of dust samples showed that there are no significant differences in the content of total iron in the presented dust samples, although there is some decrease in the depth of the dump. A stronger decrease in the transition from the surface of the dump to the depth is noted by the content of Fe3O4. All samples are magnetic, which indicates a significant content of magnetic nitrous oxide-iron oxide in the dust, most likely in an unbound state. The presence of zinc and lead impurities in the melting charge, evaporating at the operating temperatures of the furnace, leads to their oxidation by the air flow, as a result of which they can be in the final dust both in the form of free oxides and in the form of composite structures with iron oxides. It has been established that the results of the chemical analysis of electrostatic precipitator dust samples, their qualitative composition and the content of toxic heavy metals, in general (according to the average value of 10 determinations) correspond to the given technical conditions of the enterprise for this type of waste, the excess was obtained in terms of the zinc content in all considered iron-containing wastes. A distinctive feature of heavy metals present in the waste is extremely low mobility in buffer media and practical insolubility in water.</p> Y. Projdak L. Kamkina Y. Mianovska Copyright (c) 2022 2022-04-08 2022-04-08 3 140 181 192 10.34185/1562-9945-3-140-2022-15 Research and development of the method design UX / UI design internet – platforms <p>The work is devoted to interface design using the developed methodology. The paper considers the issues of developing a methodology to improve the quality of development of online stores and speed up this process. The purpose of the work was to research and develop a methodology for designing UX / UI design of an Internet platform. As a result of the work, a study was made of the design process of the user interface of the Internet platform. A methodology for designing the interface of an online store has been developed, which helps to develop a product with high quality. The main approaches to designing user interfaces were considered, studies of existing UX research methods were carried out and the most popular of them were applied. A methodology for designing the interface of an online store was developed. To evaluate the effectiveness of the created methodology, the ranking method and the network analysis method were used. As a result of an experimental study of the proposed methodology, the values of the concordance coefficient were found, which indicate a sufficient degree of agreement of opinions. Also, based on the results obtained by the network analysis method, it can be concluded that the second design option is the most preferable (global priority = 0.612). An economic justification for the feasibility of this work has been carried out.</p> K. Ostrovskaya A. Guda K. Romanyuk Copyright (c) 2022 2022-04-08 2022-04-08 3 140 193 207 10.34185/1562-9945-3-140-2022-16