National Repository of Grey Literature 44 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
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.
Engineering solutions for mitigation of climate change - methods applicable at the source of greenhouse gases
Remeková, Valentína ; Jedelský, Jan (referee) ; Lízal, František (advisor)
This work aimed to produce a research study on the topic of engineering solutions designed to mitigate climate change and which are applicable at the source of greenhouse gases. The first part outlines the fundamental matters of climate change. The second part focuses on technologies CCS (Carbon capture and storage) which capture and sequester carbon dioxide and possible options for separating CO2 from flue gases. The third chapter describes technologies CCU (Carbon capture and utilization) that use captured carbon as a product for further use. The future of these technologies and other abatement methods are addressed in the following section. The financial aspects of solutions for climate change mitigation are discussed in chapter five. The last part summarizes the main advantages, disadvantages, findings, and limitations of research.
Deposition of inhaled particles in a model of child lungs
Čederle, Jakub ; Pokorný, Jan (referee) ; Lízal, František (advisor)
This thesis presents a summary of research of deposition of inhaled particles in children’s respiratory system which was mainly conducted on realistic model of children's lungs. Experimental part introduces BUT model representing airways of 5-years-old child which served for measurements of regional deposition. Bachelor's thesis furthermore sums up basic knowledge of respiratory system and points out anatomical and physiological differences between children and adults in given field. There are described basic deposition mechanisms and their impact on aerosol therapy as well.
Design of the methodology of measurement for evaluation of filtration efficiency of portable air cleaners and purifiers
Dvořáková, Michaela ; Bělka, Miloslav (referee) ; Lízal, František (advisor)
This work focuses on the research and comparison of several types of air purifiers. It clarifies the principles of filtration and describes the basic types of air purifiers. Part of this work is designed methodology of measurement for comparison of filtration efficiency and filtration rate. The experimental part of this work contains the measurement and comparison made for two types of air purifiers. Selected purifiers were De’Longhi AC230 with mechanical filters and ionic air purifier Ionic-CARE Triton X6. Within the framework of this work an experimental set-up was constructed in the home environment for the simulation of real conditions for the function of the air purifiers. The measurement results provide information about aerosol number concentration process during the measurements and evaluation of filtration efficiency of air purifiers.
Engineering solutions for mitigation of climate change - methods for elimination of greenhouse gases from the atmosphere
Lněničková, Veronika ; Elcner, Jakub (referee) ; Lízal, František (advisor)
This bachelor thesis deals with methods of eliminating greenhouse gases, their advantages and disadvantages and the costs associated with their applications. The first part of this thesis describes the scientific field of geoengineering dealing with the removal of carbon dioxide from the atmosphere. The second part is focused on methods of solar radiation management and finally, methods eliminating other greenhouse gases than carbon dioxide are described.
Measurement and analysis of deposition of fibers from mineral wool in respiratory system
Hájek, Ondřej ; Elcner, Jakub (referee) ; Lízal, František (advisor)
This master thesis deals with inhalation of fine particles and fibres into human lungs. This is a scientific field where computer modelling is used to describe the movement of fibres and their deposition in the lungs. However, the results of these simulations must be verified experimentally. The prediction of fibres behaviour is important from a toxicology point of view where it is important to know deposition hot-spots and places where fibres could possibly cause problems. The review of the state-of-the-art is focused on the deposition of particles in human lungs followed with a chapter on fibre as a type of particle, and occupational exposure limits set by different world associations. The last theoretical chapter describes human lungs and its diseases which can evolve when limits for occupational exposure are not met. The experimental chapter consists of a description of the used experimental setup and results from an experiment together with a comparison of results with other similar experiments.
Automotive ventilation system - comparison of an influence of boundary conditions on flow from various types of ventilation outlets
Brdečko, Radim ; Pokorný, Jan (referee) ; Lízal, František (advisor)
Diploma thesis deals with a research of the flow in front of three different automotive vents. The velocity field and intensity of the turbulence was measured in detail, using thermoanemometry. After that the same data was measured with PIV method and validation was performed. The difference between achieved data was investigated. The design among the vents was also investigated, because it’s fundamentally affects the air flow. The purpose of this thesis is to obtain data about the velocity field using two methods and their subsequent use to validate numerical simulations, which will be performed in the future. The diploma thesis also contains the calculation of measurement uncertainty.
Vizualization of flow of fibers from insulation mineral wool
Kedajová, Kristýna ; Elcner, Jakub (referee) ; Lízal, František (advisor)
One of the most used insulation materials of our time is mineral wool. As with formerly used asbestos, not all the health impacts of mineral wool fibers inhalation are known. The aim of this thesis is to gather findings relating to the transport of aerosols, their deposition in human airways and to obtain and statistically evaluate experimental data from the visualization of fibres in the glass tube resembling human airways. This data can improve understanding of the relation between glass fibres action and possible health hazard.
Measurement and numerical simulation of inhaled particles in models of human lungs
Kvapil, Jakub ; Elcner, Jakub (referee) ; Lízal, František (advisor)
This bachelor thesis deals with lung models for deposition measurement and computer simulations of inhaled particle deposition. The latest findings were reviewed. The basics of human respiratory anatomy and physiology are also presented. The measurement of chitosan particle deposition was performed by a fluorometric method on the lung model, results were evaluated and compared with literature.
Low-cost sensors for measurement of particulate matter
Dvořáková, Michaela ; Pokorný, Jan (referee) ; Lízal, František (advisor)
This work focuses on the research and comparison of several types of low-cost sensors for measurement of particulate matter. It clarifies the principles of aerosol particles measurement and focuses on the reasons of using low-cost sensors. It provides basic information about the impact of aerosols on human health. The experimental part of this work compares quality of the obtained results considering the price of the respective devices.

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