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Face masks and respirators as protection against viruses and bacteria
Varga, Michal ; Mišík, Ondrej (referee) ; Lízal, František (advisor)
Pandemic caused by virus SARS-CoV-2 brought high attention to face masks and raised some questions about their filtration efficiency and performance affecting parameters such as high humidity, long term usage, fit factor, or possible decontamination methods for usage prolonging. In this thesis, mechanisms of SARS-CoV-2 transmission and structure and materials of face masks are firstly discussed. Then mechanisms of particle deposition on filter fibers are described. Subsequently standards of surgical masks, cloth masks and respirators are described and compared, with detail on carbon dioxide concentration under respirator. Nanoparticles and their possible effects on enhancing face mask parameters are briefly characterized. Then filtration efficiency and affecting parameters are evaluated. And finally possible decontamination methods for face masks reusability are summarized.
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Experimental modelling of transport of inhaled fibrous particles in lungs
Varga, Michal ; Bělka, Miloslav (referee) ; Lízal, František (advisor)
Inhaled fibrous particles may either cause different potential diseases in our respiratory system or be used positively as drug carriers targeting specific parts of the respiratory system. To better understand their behaviour in both cases, either to assess their health risk or positive effects, precise knowledge of their movement behaviour in airways is needed. Since currently there isn’t much data describing the movement of fibrous particles in airways available, the goal of this thesis was to record their movement in the model of human trachea at the first bifurcation using a high-speed camera and breathing generator simulating real cyclic breathing patterns. Collected data were then processed and evaluated using five statistical tests. In the first three tests, the orientation of fibres to streamlines, possible flips from one orientation to another during their movement and the statistical significance of these events, were evaluated. In the fourth and fifth tests the length of fibre particles was evaluated.
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Face masks and respirators as protection against viruses and bacteria
Varga, Michal ; Mišík, Ondrej (referee) ; Lízal, František (advisor)
Pandemic caused by virus SARS-CoV-2 brought high attention to face masks and raised some questions about their filtration efficiency and performance affecting parameters such as high humidity, long term usage, fit factor, or possible decontamination methods for usage prolonging. In this thesis, mechanisms of SARS-CoV-2 transmission and structure and materials of face masks are firstly discussed. Then mechanisms of particle deposition on filter fibers are described. Subsequently standards of surgical masks, cloth masks and respirators are described and compared, with detail on carbon dioxide concentration under respirator. Nanoparticles and their possible effects on enhancing face mask parameters are briefly characterized. Then filtration efficiency and affecting parameters are evaluated. And finally possible decontamination methods for face masks reusability are summarized.
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Motory HCCI
Varga, Michal
This thesis is dealing with development, characteristics and use of homogeneous charge compression ignition engine. It describes how the engine works, its construction solutions and shows the possible use of such an engine in automotive industry.
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