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Use of fluorescent techniques in study of aerosol deposition
Lippay, Josef ; Jedelský, Jan (referee) ; Mravec, Filip (advisor)
Several experiments were designed for utilization of fluorescence spectroscopy as a method of aerosol particle detection in a model of lungs. One of the experiments was to arranged use luminescent properties of DEHS (bis(2-ethylhexyl)decandioate) for calculating aerosol deposition. The outcome of this experiment was confirmation of clusters existence, which causes luminescence of DEHS. But the luminescence is not enough dependent on concentration and as such is not suitable for calculation of aerosol deposition. As the next experiment DEHS-fluorescein particles were generated by condensation monodisperse aerosol generator (CMAG), where water was used instead of isopropyl alcohol as a solvent. By this alteration the negative influence of DEHS was eliminated, which caused results refinements of aerosol deposition. Generation of fluorescein sodium salt particles by small-scale powder disperser (SSPD) was designed as a last experiment. The lower deposition efficiency measured by this method was caused by particles polydispersion. Photo records were used for documentation of Hot-spots. Outcomes of this study are new knowledge of fluorescence spectroscopy utilization for study of aerosol deposition and possibilities of fluorescent aerosol particles generation. Acquired data can serve for knowledge extension of possible detection methods for aerosol particles in the model of lung and can serve for validation of numerical simulations.
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Condensation aerosol generator - range of operation
Súkeník, Michal ; Chovancová, Michaela (referee) ; Lízal, František (advisor)
In this bachelor thesis I deal with condensation aerosol generator and its range of operation. This device is based on controlled heterogenous condensation and is widely used in different fields such as inhalation studies, testing filters or calibration of measuring devices. The primary aim of the thesis is to verify the quality of producing aerosol and the depandance on the operation conditions. I also deal with methods of generated aerosols as well as their statistical description.
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Deposition of particles in a model of human lungs
Jakuš, Matúš ; Tuhovčák, Ján (referee) ; Bělka, Miloslav (advisor)
The main purpose of thesis was to do a research of methods suitable for measuring the deposition of particles in human airways. Thesis also contains experiment with porous particles and evaluation of created samples using phase-contrast microscopy. Porous particles seem to be appropriate option for delivering drugs or therapeutic aerosol into the human airways and that made them very interesting in past few years. Theoretical basics of physiology of human airways, aerosols, physical principles of particle deposition and realistic model used during experiment are also explained in this study.
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Fluorescenec spectroscopy in study of aerosol-forming substances
Lippay, Josef ; Jedelský, Jan (referee) ; Mravec, Filip (advisor)
To study the spectral characteristics of a substance DEHS several experiments were suggested. Closer investigation was made on study of the effect of different environments on the spectral properties of the substance DEHS. It was found that the highest positive effect on the fluorescence of the substance DEHS have a medium with hydroxyl groups. IPA was evaluated as the best medium for further experiments. It was found that the medium xylene decreases intensity of the fluorescence to the detection limit. Spectral characterization of the nondegraded and degraded DEHS was performed. It was found that for the degraded DEHS shift to higher wavelengths occurs due to degradation. Possible contamination of the DEHS with substances causing luminescence has not been proven.
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The use of greywater and rainwater for public facilities
Korytář, Ivo ; Raček, Jakub (referee) ; Raclavský, Jaroslav (advisor)
This paper analyzes the usage of grey and rain water in civic amenities. Its main goal is to assess the advantages and disadvantages of the grey and rain water and to dissect the problematic of rain water quality. In order to reach its goal, the current paper will analyze the already applied system of using grey water, specifically in the case of MOSAIC HOUSE in Prague, which was the first in the Czech Republic and second in the world to use grey water for heat purposes. In conclusion, this Bachelor’s paper presents one object of civic amenities, specifically the guesthouse U Cerneho psa in Cesky Krumlov, with the proposal of grey water purifier by ASIO s.r.o. and grey water seepage object from the same company together with a projected balance sheet.
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Size Dependence of Incorporation of Gas Molecules into Aerosol Nanoparticles
Levdansky, V.V. ; Smolík, Jiří ; Ždímal, Vladimír ; Moravec, Pavel
The influence of size effects on the physicochemical transformations and transfer phenomena in the heterogeneous systems with nanoobjects attracts increasing attention of researchers. These problems are of interest for nanotechnology and atmospheric physics. Size effects can influence the cohesive energy as well as the activation energies of vacancy formation and diffusion of atoms in the nanoscale particles (Vanithakumari and Nanda, 2008). Phase transitions in aerosol systems with nanoscale particles (clusters) also depend on the nanoparticle size (Levdansky et al., 2010). Hear we discuss the size dependence of the mass accommodation coefficient in the aerosol system with nanoparticles.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22013091912290 - PDF
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