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  Study of Fast Switching Processes in Cadmium Telluride Based Structures

  (Сумський державний університет, 2022) Kirichenko, M. V.; Drozdov, A. N.; Shkoda, D. S.; Zaitsev, R. V.; Khrypunov, G. S.; Minakova, K. O.; Nikitin, V. O.

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  One of the main requirements for modern radio electronic equipment is the issue of electromagnetic (EM) stability, which means the ability to maintain operating parameters during and after the action of pulsed EM radiation of various origins. The problem of ensuring EM stability is due to the fact that under the influence of EM pulses, overvoltage pulses appeared in the circuits, which is particularly prone to the destruction of semiconductor devices due to both the properties of the p-n junction and the specific thermal conductivity of semiconductor materials. At the same time, the effects of resistive switching are actively used in modern electronics, in particular, the work of memristors is based on resistive switching in oxides of transition metals. This effect of resistive switching has long been observed in CdTe, both on thick (more than 100 μm) single-crystal layers and in thin polycrystalline films. The novelty of the proposed work consists in the fact that switching processes between low and high conductivity states in CdTe films depend on various factors, such as the film thickness, its initial structure, the power of the switching pulse, and the contact properties. Thin film CdTe based structures were prepared by using vacuum deposition methods. The study of fast switching processes in manufactured Mo – cadmium telluride – Mo structures was carried out by measuring and further analytical processing of their amplitude-time characteristics under the action of EM pulses of nanosecond duration. It was found that the prototypes with a metallization diameter of 0.5 mm and 6 mm, made using the planar technology, have similar parameters: the switching time is at the level of 1-2 ns, similar values of the cutoff voltage and the course of its dependence on the pulse amplitude. The geometry of the contact metallization does not affect the switching parameters of structures, and in the manufacture of protection elements against EM pulses on their basis, an industrial technology for the formation of metallization can be used without the need for its excessive miniaturization.

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  Термодифузійне легування як метод протикорозійного захисту

  (Національний технічний університет "Харківський політехнічний інститут", 2025) Прянічніков, Д. І.; Байрачний, Володимир Борисович

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  Evaluation of the efficiency of maintenance and repairs to metallurgical equipment

  (Криворізький національний університет, 2025) Biletskyi, V. S.; Taratuta, K. V.; Kulik, Tetiana

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  Metallurgical enterprises are among the most capital-intensive industries, with high maintenance and repair costs for equipment. The proper management and efficient operation of equipment directly affect product output, safety, and economic performance indicators. The current study aimed to develop key performance indicators for engineering services, emphasising the systematisation of indicators into technical, organisational, and economic groups. This enabled the authors to address the primary challenge of evaluating the efficiency of maintenance and repairs in metallurgical enterprises using the developed key performance indicators. The study analysed and classified thirty-six performance assessment indicators. Using the Delphi expert assessment method and the subsequent step-by-step analysis of weight assessment coefficients via the fuzzy Step-Wise Weight Assessment Ratio Analysis method, the key factors for the operational control of the maintenance and repair efficiency of metallurgical equipment were identified. These factors were categorised into three groups. The first group included five technical indicators; the second, six organisational indicators; and the third, three economic indicators of the efficiency of technical maintenance and repairs of metallurgical equipment. Analysis of the obtained rating of key performance indicators showed that the most significant indicators were complex (generalising) indicators in each group. The key indicators in each group were determined to be: the technical readiness coefficient of equipment; the overall efficiency indicator of equipment; and the cost intensity of technical maintenance and repairs of equipment. Based on the indicator ratings, recommendations were developed for compiling a compliance matrix and priority measures in the event of negative dynamics in each group of indicators. The practical significance of this work lies in providing technical maintenance and repair specialists at metallurgical enterprises with criteria for objectively assessing the current state of equipment management, thereby enabling improvements to be made to the repair system

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  Метод екологічного моніторингу стічних вод ТЕЦ

  (Національний технічний університет "Харківський політехнічний інститут", 2025) Себко, К. В.; Матющенко, Олександр Вікторович; Пітак, Інна Вячеславівна

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  Визначення параметрів стічних вод промислових виробництв

  (Національний технічний університет "Харківський політехнічний інститут", 2025) Васильєв, Д. В.; Себко, Вадим Вадимович

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