|
|
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.
|
|
| |
|
|
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.
|
|
|
Deposition of Molecular Magnets on „2D“ Materials
Vavrečková, Šárka ; Musálek, Tomáš (referee) ; Hrubý, Jakub (advisor)
This thesis deals with deposition of single-molecule magnets on 2D materials and studies their behavior on surfaces. Theoretical part contains information about properties of single-molecule magnets, deposition methods and also information about chosen 2D materials – graphene and molybdenum disulfide. Further, the physical principles of the selected characterization methods (atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and electron paramagnetic resonance) are described. In the experimental part graphene and molybdenum disulfide were exfoliated. Afterwards, depositions of single-molecule magnets from solution and by thermal sublimation were made. After that, samples were analyzed using the mentioned methods and results were discussed.
|
|
|
The deposition of CaF2 ultrathin layers on graphene substrate
Caesar, Radek ; Nebojsa, Alois (referee) ; Mach, Jindřich (advisor)
This master’s thesis is focused on preparation and analysis of ultrathin CaF2 (calcium fluoride) films on a graphene substrate. CaF2 was deposited in UHV conditions at substrate temperatures in the range from 20 °C to 400 °C. The material was deposited on Si(111) with a native SiO2 layer and on a substrate with a CVD graphene layer. The deposited films were analyzed by XPS, AFM and SEM. Moreover four different sample holders for deposition purposes were designed in this work.
|
|
|
UV detection by Grafen/GaN structures
Kostka, Marek ; Piastek, Jakub (referee) ; Mach, Jindřich (advisor)
This bachelor thesis covers fabrication as well as the study of behavior of UV sensor based on galium nitride structures on graphene substrate. The sensor takes advantage of high mobility of charge carriers in graphene and UV selective sensitivity of GaN nanoctystals. This combination exhibits a potential for being a UV sensor because of the unique properties brought by both materials. The first part of this work describes graphene, galium nitride and graphene/GaN heterostructure with their properties and fabrication processes. The second part includes full description of already used fabrication process and characterization of the optical and electrical behavior using photoluminiscence and transport properties measurements.
|
|
|
Optimization of thin films of metal oxide materials
Vítek, Jiří ; Šimonová, Lucie (referee) ; Šubarda, Jiří (advisor)
This thesis is focused on the description of the method of reactive sputtering of thin films. Currently, there are many ways how to create thin films and there are many applications of thin films in various industrial sectors. In this paper at the first are listed the issue of thin films, followed by an overview of the deposition techniques and of the chemical analysis of deposited thin films. It also describes the four-point measurement method of sheet resistance, mechanical test of adhesion and optical properties. At the end of the theoretical part are described the material composition of the deposited films. The goal of the practical part is to optimize the deposition process of the mixed layer of indium tin oxide (In2O3: SnO2) and contribute to the overall understanding of the influence of annealing on the layer. There were created six series of samples with that applied layers. First, the work focused on examining of the influence of annealing on the throughput in the whole measuring range, and then comparing the series due to the transmittance in the visible light spectrum. Furthermore were compared the value of sheet resistance of unannealed and subsequently annealed samples.
|
|
|
Design of manipulator for ultrahigh electron microscope
Caesar, Radek ; Mach, Jindřich (referee) ; Bábor, Petr (advisor)
The main purpose of this thesis is mechanical design of a manipulator for an ultra-high vacuum scanning electron microscope (UHV SEM), being currently developed by TESCAN ORSAY HOLDING a.s. in cooperation with the Institute of physical engineering FME BUT. The manipulator is supposed to be able to handle with specimens in so-called preparation chamber, which the specimens are put in before placing into the analytic chamber. In the preparation chamber the surface finishing and also other operations are made. In the theoretical part some of the technologies used in vacuum engineering, especially various principles of pressure measurement and gas pumping, are described. Besides, the thesis is focused on a brief description of UHV SEM being developed and the methods of specimen preparation. The practical part deals with the concept and the mechanical design of manipulator itself.
|
|
|
Process Gas Heating Systems in Cold Spraying
Babinský, Tomáš ; Ing. Tomas Denk, Glass Service Inc., Vsetin, CR (referee) ; Čížek, Jan (advisor)
The goal of this bachelor's thesis is to present ways of gas heating used in the cold spray technology. Primarily the work is focused on description of currently-used techniques of high-pressure gas heating in cold spray and introduction to commercial products. Part of the work is dedicated to the gas temperature influence on the coating process. Gas heating methods in various industrial applications are summarized in the final chapter for potential use in cold spray technology.
|
|
|
Strucure and mechnical properties of cold sprayed Ti-6Al-4V layer
Sabela, Jakub ; Zelený, Martin (referee) ; Řehořek, Lukáš (advisor)
Diploma thesis deals in the first part with recent knowledge of cold spray, its mechanism and parameters of deposition, advanced coatings made by cold spray and their applications, knowledge of Ti-6Al-4V coatings and their heat treatment. Deposit of Ti- 6Al-4V powder was made by cold spray process. In experimental part, microstructure and mechanical properties of supplied and its heat treated material were observed and examined. Mechanical properties and microstructure remained unchanged by annealing at 600 °C as in the case of supplied material. Recrystallization occured in microstructure of and phases by annealing at 800 °C. Grains were emerged in microstructure and mechanical properties were decreased. Mechanical properties were improved by annealing at 900 °C due to quenching. Microstructure consists of and ’ phases. Mechanical properties were the worst for annealed material at 1000 °C because of coarsed grains. Material which was annealed at 800 °C, quenched and precipitation hardened had the best microstructure and mechanical properties.
|
guest ::
