Browsing by Author "Rudyk, Yuriy"
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Item Material testing and results estimation by safety indexes(Видавництво Львівської політехніки, 2021-02-23) Mykyichuk, Mykola; Rudyk, Yuriy; Lviv Polytechnic National University; Lviv State University of Life SafetyIn the article, both the test method features and the test results of research of thermal behavior of steel fragment were analyzed. Two types of test conditions for steel construction material were considered. The definition and main features of measurement techniques were presented. Fire retardant material test results for steel plates with hydrogen combustion shown the limit of fire resistance of the tested samples is more than 30 min. The main advantages and disadvantages of the test were determined. The positive and negative aspects of this approach were analyzed. These techniques' effective thermal condition is in an environment of uncertainty and has no limited resources was established. Concepts and principles for establishing validity, and frameworks and methods for validating test methods and their results are important elements of safety systems. The article considers the safety of the technical component of a complex organizational and technical system with the study of the functional relationship between the safety elements parameters: temperature, time, fire retardant – by hydrogen participation.Item The effect of vacuumization on the photoluminescence and photoresponse decay of ZnO nanostructures grown by different methods(Lviv Polytechnic Publishing House, 2015) Rudyk, Yuriy; Rudko, Mykola; Turko, Borys; Rudyk, Viktor; Panasiuk, Myron; Kapustianyk, Volodymyr; Vaskiv, Andriy; Ivan Franko National University of LvivThe effect of vacuumization on photoluminescence (PL) spectra and photoresponse decay of ZnO nanostructures fabricated by different methods was investigated. The visible band of photoluminescence and ultraviolet (UV) photosensitivity of the samples grown from the vapor phase was associated with the surface defects such as oxygen vacancies, and for the samples grown by hydrothermal method - with presence of the surface hydroxyl groups. The experimental results show that ZnO nanostructures grown from the vapor phase would be promising for producing of the low cost and effective UV detecting devices.