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Multi-stage impactor
Kojecký, Dalibor ; Sitek, Tomáš (referee) ; Pospíšil, Jiří (advisor)
This master’s thesis is focused on the problem of laboratory capture of fine particles by the impaction method. The introductory chapter is devoted to the investigation of fine particles in air and the impact of air pollution on humans and the environment. The second chapter intro-duces the history of impaction devices, describes the principles of the cascade impactor, and explains the theory behind fine particle capture by changing the direction of the airflow carrying the particles and their capture when they hit a solid wall. In the practical part of the thesis, a computational procedure is developed using the Python programming language for a custom design of a multi-stage impactor. The parameters obtained from the developed computational software are compared with those of a commercial impactor available at the faculty of the school. According to the developed computational procedure, a custom multi-stage impactor is designed for particle separation in the range of PM0.5 to PM0.1.
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A complex mechanistic lung model
Chumchal, Ondřej ; Mišík, Ondrej (referee) ; Jedelský, Jan (advisor)
This bachelor thesis looks at review of published airway models, with purpose of finding best avaliable solution for extension of current BUT model, reaching 7th generation of branching. The main purpose of the thesis is expanding model further into lower generations. Secondly, it deals with possibilities of getting more realistic results by coming with influence of temperature and humidity. Two main approaches were chosen, which shall be further more explored and adopted into use in BUT model, those are glass bead and rod model. In order to make model as realistic as possible, dimensionless characteristics such as Reynolds number and ratio of inner surface and volume of each generation were calculated to match those in real human lungs. The thesis concerns expansion down to 12th generation. Further calculation of deposition and flow parametres should be done, in order to verify mentioned approach.
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Application of a novel continuous sampler for the determination of compounds in ultrafine aerosol
Hlaváčková, Hana ; Řezáčová, Veronika (referee) ; Alexa,, Lukáš (advisor)
The diploma thesis is focused on the use of new type of continuous sampler for the determination of compounds in ultra-fine aerosol. The aim of the study was to optimize parameters of the aerosol sampler CGU-ACTJU (Condensation-Growth Unit – Aerosol Counterflow Two-Jets Unit) and its application for the real aerosol samples. The ACTJU sampler connected to upstreamed CGU enables sampling of ultra-fine fraction of particulate matter to the diameter about few nanometers. The measured results from CGU-ACTJU were compared with commercial sampler (cascade impactor) with subsequent offline analysis. The atmospheric aerosol was sampled in two campaigns (July–August 2021 and February 2022) on the terrace of Institute of Analytical Chemistry of CAS in Brno. Theoretical part of the study contains information about analytical methods for the characterization of aerosol, the experimental part describes used methods in detail and the results of experiments are discussed.
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Application of a novel continuous sampler for the determination of compounds in ultrafine aerosol
Hlaváčková, Hana ; Řezáčová, Veronika (referee) ; Alexa,, Lukáš (advisor)
The diploma thesis is focused on the use of new type of continuous sampler for the determination of compounds in ultra-fine aerosol. The aim of the study was to optimize parameters of the aerosol sampler CGU-ACTJU (Condensation-Growth Unit – Aerosol Counterflow Two-Jets Unit) and its application for the real aerosol samples. The ACTJU sampler connected to upstreamed CGU enables sampling of ultra-fine fraction of particulate matter to the diameter about few nanometers. The measured results from CGU-ACTJU were compared with commercial sampler (cascade impactor) with subsequent offline analysis. The atmospheric aerosol was sampled in two campaigns (July–August 2021 and February 2022) on the terrace of Institute of Analytical Chemistry of CAS in Brno. Theoretical part of the study contains information about analytical methods for the characterization of aerosol, the experimental part describes used methods in detail and the results of experiments are discussed.
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A complex mechanistic lung model
Chumchal, Ondřej ; Mišík, Ondrej (referee) ; Jedelský, Jan (advisor)
This bachelor thesis looks at review of published airway models, with purpose of finding best avaliable solution for extension of current BUT model, reaching 7th generation of branching. The main purpose of the thesis is expanding model further into lower generations. Secondly, it deals with possibilities of getting more realistic results by coming with influence of temperature and humidity. Two main approaches were chosen, which shall be further more explored and adopted into use in BUT model, those are glass bead and rod model. In order to make model as realistic as possible, dimensionless characteristics such as Reynolds number and ratio of inner surface and volume of each generation were calculated to match those in real human lungs. The thesis concerns expansion down to 12th generation. Further calculation of deposition and flow parametres should be done, in order to verify mentioned approach.
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