Перегляд за Автор "Yavorskyi, Yurii"

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  • Ескіз
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    Aerospace Materials Science. Laboratory practicum
    (Igor Sikorsky Kyiv Polytechnic Institute, 2023) Yavorskyi, Yurii; Dudka, Oleksandr; Solovar, Olexii
    Materials science is very important in the training of engineers who will be designers and technologists in the aerospace industry. Understanding the processes of forming the properties of materials depending on their structure, chemical composition, and treatment techniques will provide an opportunity to perform work at a high level. On the other hand, the application of acquired knowledge in the field of aviation materials science will improve the control of the quality of the released products and the ability to determine compliance with technical requirements. The "Aerospace materials science: Laboratory Practice" study aid is written by the program (syllabus) of the "Aerospace Materials Science" subject for students under the educational programs "Aerospace and rocket systems engineering" and “Airplanes and Helicopters” specialty 134 Aviation and rocket-space technic. Besides the students of engineering specialties in the field of aviation and rocket science, the textbook will be useful for graduate students, researchers, and specialists of other technical specialties, whose activities are related to the selection of materials, etc.
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    Change in structural and potentiodynamic characteristics of SiO2/TiO2 nanocomposite due to changing mechanosynthesis duration
    (Igor Sikorsky Kyiv Polytechnic Institute, 2023) Tiancheng, An; Yavorskyi, Yurii
    Structure and scope of practice work. The paper consists of 6 chapters. literature review, research materials and methods, results, occupational health and safety in emergencies, economic section, development startup project, conclusions and reference list. This work include: 111 pages, 51 figures, 23 tables, 13 formulas, 58 references. Actuality. Modern technology requires the creation of new materials with the best electro-chemical and operational properties that meet the criteria of manufacturability, environmental friendliness, and low cost. Therefore, the study of the properties of materials with unique features is undoubtedly relevant. This work presents the study the of influence of the duration of mechanoactivation SiO2/TiO2 mixture with a component ratio of (80/20) % on the structure characteristics. The purpose and tasks of the research. The work aimed to determine the effect of the duration of mechanical processing on the structural characteristics of the powder SiO2/TiO2 nanocomposite and dependence between the changes in structure and electrochemical characteristics. The object of the study – 80 % SiO2/20 % TiO2 nanocomposite after different duration of treatment. The subject of research – X-Ray diffraction patterns, ultra soft X-ray emission specters (USXE) and potenciodynamic (PD) data. Methods of research – XRD, USXE spectroscopy, PD investigation. Scientific innovation. The renowned technique of shock-vibration processing enables the amalgamation of the distinctive characteristics of nano-powder materials. The pioneering aspect of this research lies in ascertaining the impact of mechanical activation on the crystal-structural parameters of the SiO2/TiO2 nanocomposite, and PD characteristics of lithium power sourses.
  • Ескіз
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    The effect of mechanical processing duration of the nanopowdered SiO2/TiO2 composite on the morphology and galvanostatic characteristics of lithium power sources
    (Igor Sikorsky Kyiv Polytechnic Institute, 2023) Yulong, Guo; Yavorskyi, Yurii
    Structure and scope of master theses. It consists of seven 8 parts: literature review, research materials and methods, results, occupational health and safety in emergencies, economic section, development startup project, conclusions and reference list. Master thesis include: 101 pages, 67 pictures, 20 tables, 86 references. Actuality. Modern electronics require the use of portable energy sources with high indicators of electrochemical characteristics. Currently, the most promising means of energy conservation are lithium power sources (LPS). The purpose and tasks of the research. The aim of the work was to determine the effect of the duration of mechanical processing on the morphology of the powder SiO2/TiO2 nanocomposite and electrochemical characteristics of LPS with cathodes based on such nanocomposites. The object of the study – SiO2/TiO2 nanocomposite with a component ratio of 80/20 % after different duration of treatment. Subject of research – SEM images with magnification 500 and 2500 times, data of USXES and galvanostatic investigation. Methods of research – SEM, USXES, galvanostatic analysis. Scientific innovation. The determination of the effect of mechanical activation on the morphological features of SiO2/TiO2 nanocomposite and dependence of galvanostatic characteristics of LPS from these features. Practical significance of the obtained results. The generalized results can be used to predict changes in the structural and electrochemical characteristics of LPS with cathodes based on other nanosized oxides. Approbation of coursework materials. The result of work presented in the international conferences HighMatTech-23 and XIX – ICPTTFN.