Кафедра прикладної механіки та мехатроніки
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Item type:Наукова стаття, Theoretical and Experimental Studies of the Properties of Porous Permeable Materials Obtained from Industrial Waste(2022-05-25) Povstyanoy, Oleksandr; Imbirovich, Nataliya; Tkachuk, Valentyna; Redko, RostyslavThis article theoretically and experimentally investigates the scientific and technical problem of using multilayer porous permeable materials from industrial waste with controlled functional and technological characteristics by predicting the composition, structure, properties using computer information technology. These porous permeable materials (PPM) from industrial waste are suitable for the purification of technical liquids and gases, which has increased the efficiency of using products in various fields of mechanical engineering. The method of computer modeling proposed by the authors will allow not only to determine the porosity distribution of the filter material but also to determine the relationship between technological and structural parameters. The results of this scientific work are used to develop porous permeable products - filters - for the purification of technical, industrial water, lubricants, and fuels from mechanical impurities contaminants. Developed multilayer porous permeable materials have a higher coefficient of permeability, resource, and dirt capacity with similar single-layer.Item type:Наукова стаття, Information and measurement system for analyzing images of fundus tissue using computer-integrated technologies(2025-10-22) Povstyanoy, Oleksandr; Vynokurova, Olena; Denysiuk, Viktor; Lapchenko, Yuryi; Hrudetskij, RomanThe paper presents the results of research and development of a modern information and measurement system (IMS) designed for automated analysis of fundus images for the purpose of diagnosing and monitoring ophthalmic pathologies. The proposed system combines methods of digital medical image processing, artificial intelligence and computer vision, which allows ensuring high accuracy and objectivity of the diagnostic process. Particular attention is paid to the use of deep learning algorithms for the segmentation of anatomical structures of the retina and analysis of fluorescent images. A comprehensive method of photodynamic diagnostics and therapy has been developed, which is implemented based on a modified slit lamp with a laser illuminator. Effective methods of image registration and processing have been proposed, in particular their synchronization and spectral analysis, which allows for quantitative assessment of the state of tissues. The results of the study can be used in ophthalmological practice to increase the accuracy of early detection of pathologies, as well as in telemedicine and personalized medicine systems.Item type:Наукова стаття, Formation of Coatings on Titanium Alloys Saturated with Biocomponents by the PEO Method(Cham: Springer, 2025-02-14) Povstyanoy, Oleksandr; Imbirovych, Nataliia; Boiarska, Inna; Nykoliuk, TamaraIn the work, the influence of the composition of the electrolyte on the elec-trophysical parameters of the synthesis of coatings with increased biocom-patible properties was studied. It was established that under conditions of increased electrolyte concentration, the voltage at which the coating is syn-thesized decreases. This effect can be explained by the thermodynamic Gibbs conditions. According to these conditions, the system needs more energy when the medium contains more elements, which must also con-sume a certain amount of energy. The authors found that sodium salts in-crease the conductivity of the working environment. This effect affects the speed of the synthesis process and can reduce the cost of the energy re-serve of the system as a whole. Spectral analysis established that during the synthesis of a titanium alloy in an alkaline electrolyte, an equilibrium non-degenerate quasi-ideal plasma is realized in the discharge channel with a temperature of (1...1,1)×104 K and an electron density of (3,2...3,4)×1022 m-3. It is under these conditions that molecules dissociate into ions and interact with the components of the elec-trolyte, which leads to oxidation of the surface of valve metals and the formation of stable compounds with high biocompatible properties.Item type:Наукова стаття, Production and Surface Research of a New Material with the Addition of Diatomite for Potential Filtration Applications(Cham: Springer, 2025-07-12) Povstyanoy, Oleksandr; Imbirovych, Nataliia; Smetjukh, Bohdan; Karbovska, YuliiaThis work is dedicated to the research and study of the possibility of using Natural minerals such as Diatomaceous Earth (diatoms) for filtering various environments. The extraordinary progress and prospects of diatomaceous earth (DE) as a biomatrix material for creating porous materials are relevant and interesting. The unique structures of DE, including its mesoporosity and large surface area, have made it a key material for the filtration process. Its biotemplating ability can initiate the creation of highly efficient porous permeable materials. Its sufficient natural abundance and ecological properties are consistent with the increasing emphasis on sustainability in environmental solutions. Its complex structures and biotemplating capabilities will pave a compelling path in the future for the advancement of sustainable, highly efficient solutions for filtering environments, marking a significant step towards a more ecological and efficient future for humanity. This research paper explores the potential of DE as a bio-matrix material for creating a permeable material without delving into the complex filtration processes. Previous studies have shown that the use of Diatomaceous Earth with titanium powder in various proportions allows us to talk about the possibility of creating highly efficient porous permeable materials with branched porosity even for drinking water filtrationItem type:Наукова стаття, Investigation of the Corrosion Resistance of Porous Permeable Materials with Protective Coatings(Cham: Springer, 2022-09-09) Povstyanoy, Oleksandr; Imbirovych, Natalia; Posuvailo, Volodymyr; Zabolotnyi, OlegIt is known that porous permeable materials are subject to corrosion during filtration and cleaning of aggressive media, which leads to their failure. That is why the urgent task is to increase their corrosion resistance. This article is devoted to the study of the corrosion resistance of PPM with combined protective coatings applied to their surface in the form of table salt and hydrochloric acid. The corrosion resistance of PPM with combined protective coatings applied in solutions of sodium chloride and hydrochloric acid has been studied. Com-bined protective coatings were formed by the methods of electric arc spraying and aluminum alloy on the surface of PPM and subsequent plasma electrolytic treatment. As a result, a combined protective coating is formed on the surface of the PPM. Based on potentiodynamic mode established that the corrosion potentials in a solution of table salt move in the positive direction when a combined coating is applied to the surface of the PPM, which indicates a de-crease in the corrosion activity of the surface. The corrosion currents of the combined protective coating for all the studied systems are reduced by 3 or-ders of magnitude, and an increase in the ratio of the cathode to anode current density reduces the rate of corrosion of the coating by another five timesItem type:Наукова стаття, The State of Electrolytic Plasma in Synthesis of Oxide Ceramic Coatings on the Magnesium Basis(Cham: Springer, 2023-05-23) Povstyanoy, Oleksandr; Posuvailo, Volodymyr; Imbirovych, Nataliya; Tkachuk, ValentynaThe basis for determining the density of electrons in plasma is the study of the broadening of spectral lines, which is caused by the linear Shtarkeffect. AQ1 This article demonstrates the applicability of the classical theory of scattering, with the help of which, analyzing the spectral characteristics of spark plasma discharges in the electrochemical system of magnesium-electrolyte, determined that during the synthesis of oxide-ceramic coatings on a magnesium basis in discharge channels for electron density (3.2…3.4)·1022 m−3 and their temperatures (1…1.1)·104 K equilibrium, not degenerate, quasi-ideal plasma is formed with an ionicity (0.02…0.10). This temperature makes conditions for dissociation and ionization of electrolyte components and also ensures high chemical reactivity. At the same time, the speed of the reaction is much higher compared to classical electrochemical methods. The performed calculations provide the possibility of further correct thermodynamic calculation of the concentrations of the reaction products of the synthesis of oxide ceramic coatings in the electrolytic plasma of the magnesium alloy–electrolyte system.Item type:Наукова стаття, Numerical Evaluation of the Properties of Highly Efficient Titanium Porous Materials(Cham: Springer Nature Switzerland, 2023-08-21) Povstyanoy, Oleksandr; Imbirovich, Nataliya; Redko, Rostyslav; Redko, Olha; Savaryn, PavloAn exciting combination of such properties as high strength, low den- AQ1 sity, corrosion resistance, and biocompatibility characterizes titanium. However, the widespread use of titanium at the industrial level has not yet been achieved due to its high extraction and production costs. Therefore, titanium is increasingly used in sectors with high demand, such as the aerospace industry or the production of biomedical devices, where the final high cost is not a major factor. It is believed that processing titanium and its alloys using powder metallurgy (PM) methods is a significant way to reduce the cost of manufacturing titanium products. It also provides the opportunity to develop new alloys that are difficult to obtain using traditional technologies. This work is devoted to processing titanium powder from biomedical production waste using various PM methods. It aims to research the processing of almost pure, chemically homogeneous, and finegrained titanium-based components. In particular, the main properties that can be achieved (porosity, microstructure, and mechanical properties) and the creation of highly efficient porous materials by advanced methods of isostatic pressing are presented.Item type:Наукова стаття, Anti-friction Products from Composite Materials Based on Lh15 Steel Powder(2024-07-06) Povstyanoy, Oleksandr; Halchuk, Tetiana; Polinkevych, Romаn; Redko, OlhaThe work considers the possibility of manufacturing and using sintered composite products from a metal component in the form of alloy steel powder ob-tained from grinding waste of bearing production. The research was carried out at op-timal pressing parameters of 400...800 MPa, sintering at 1200°C for 2 hours from the moment of setting the specified temperature. The results of the first systematic studies of the strength and tribotechnical properties of sintered materials based on LH15 steel powder obtained from grinding slurries with copper and graphite additives are pre-sented. It was established that the tribotechnical characteristics of sintered products under conditions of medium loads mainly depend on the hardness of the composition. It has been experimentally verified that the high wear resistance and friction coefficient, which is on average 0.09, has a composition with a content of 2% graphite and 4% copper at a sliding speed of 5 m/s and a pressure of 10 MPa. It has been experimental-ly confirmed that the increase in the linear dependence of stress on deformation, in particular, when the strain is 8%, the stress is 1200...1400 MPa. This makes it possible to predict higher operational properties of products made from material of this com-position. The resulting anti-friction products have a significantly lower cost and a higher material utilization ratio compared to traditional materials.