National Repository of Grey Literature 18 records found  previous11 - 18  jump to record: Search took 0.00 seconds. 
Aerosol and microbial microclimate of clean rooms
Stojanová, Barbora ; Andrys, Petr (referee) ; Rubina, Aleš (advisor)
Master´s thesis deals with the issue of internal microclimate of clean rooms. The experimental part focuses on aerosol and microbial microclimate. Different operating and intervention rooms were measured and then evaluated whether the cleanroom would comply with the standard cleanliness class even in normal operation after previous validations. The microbial examination of different clean spaces investigated the extent to which the exact passive fall method and its evaluation were time-dependent. From the data the correct desing of the air-conditioning system and its subsequent realization and regultion were verified. The theoretical part describes requirements for clean rooms according to SÚKL-LEK 17 and ČSN EN ISO 14644-1. In addition, a detailed methodology of the procedure of air-conditioning implementation is elaborated to the final validation and testing of clean rooms.
Phenomenological models inspired by QCD and their use in the analysis of ultra-high energy cosmic rays
Ebr, Jan ; Řídký, Jan (advisor) ; Leitner, Rupert (referee) ; Unger, Michael (referee)
Cosmic rays of energies above 1014 eV are detected mostly indirectly, by observing the extensive air showers they create in the atmosphere. Multiple experiments suggest that the current models of high-energy interactions do not describe the cosmic ray data perfectly, in particular when it comes to the prediction for the number of muons at ground. We present two models aiming to improve the description of the muon component, one based on the addition of particles with small momenta in the local center-of-mass frame of the high-energy hadronic interactions in the shower, the other on the addition of the so-called dark photons to the electromagnetic part of the shower. While we find the latter having no observable consequences, the former improves the agreement between observed and predicted amounts of muons both for the DELPHI cosmic ray data and for the measurements by the Pierre Auger Observatory. We also describe the FRAM telescope, a device used to monitor the atmosphere at the Pierre Auger Observatory, and its applications to the search for anomalous shower profiles and to the measurement of the aerosol content of the atmosphere, which is crucial for the analysis of data obtained by fluorescence detectors. 1
Coupling atmospheric chemistry/aerosols to regional climate models
Huszár, Peter ; Halenka, Tomáš (advisor) ; Macoun, Jan (referee) ; Eben, Kryštof (referee)
Title: Coupling atmospheric chemistry/aerosols to regional climate models Author: Peter Huszár Department: Department of Meteorology and Environment Protection Supervisor: doc. RNDr. Tomáš Halenka, CSc. Supervisor's e-mail address: tomas.halenka@mff.cuni.cz Abstract: In this thesis, the connections between air quality and climate are studied. For this purpose, regional climate model RegCM3 and chemistry transport model CAMx has been coupled offline with one- and two-way interaction. Our work represents a first attempt to connect RegCM3 not only with CAMx, but with any other chemistry transport model. As a first step, an offline one way couple of RegCM3 and CAMx has been developed, meaning that the climate model drives the transport, emission, chemical transformation and deposition of species while the radiative feedbacks of gases and aerosols are not considered. A meteorological interface has been developed at our department in order to convert the meteorological data generated by RegCM3 to fields required by CAMx. For those parameters that are essential for CAMx but the regional climate model does not supply them, diagnostic methods were implemented into this interface. Further, it is used to calculate biogenic emissions. Regarding anthropogenic emissions, a simple utility has been developed to...
Filtration efficiency of nonofiber cloth
Šimková, Kristýna ; Bělka, Miloslav (referee) ; Lízal, František (advisor)
In this bachelor thesis I deal with filtration efficiency of nanofiber cloth, which are determined by number of aerosol particles measured in front of the filter and behind the filter using APS. Aerosol particles are generated by CMAG. The next topic of this thesis is a search of particle filtration of micrometer size.
Stanovení koncentrací atmosférického aerosolu s vysokým velikostním a časovým rozlišením za účelem odhadu jeho zdrojů a genotoxity
Univerzita Karlova v Praze, Přírodovědecká fakulta, Praha ; Hovorka, Jan
Zpráva se zabývá výsledky kampaní 2009. Nejdůležitějšími výsledky jsou: 1. Z aplikací receptorových modelů na data elementárního složení a velikostních distribucí aerosolu, meteorologie a plynných složek atmosféry vyplývá, že nejdůležitějšími příčinami zvýšených koncentrací aerosolu v létě 2008 v Praze byla doprava a prašnost, v Březně emise z uhelných elektráren. Na obou lokalitách byla jedna čtvrtina kampaně ovlivněna epizodami spojenými se vznikem nových částic a jejich kondenzačním růstem. 2. Z dynamiky velikostních distribucí vyplývá, že proces vzniku nových částic ovlivňoval zásadním způsobem kvalitu vnějšího ovzduší zejména na pozaďové lokalitě Láz (>60 % času) v Praze a Březně (kolem 25 %) a nejméně v blízkosti dálnice (méně nežli 25 %). 3. Jak vyplývá z resuspenzních měření a liniových měření pomocí DT, skládková činnost a vlastní těžba uhlí na území velkodolu Nástup neprodukují aerosol o aerodynamickém průměru částice zhruba menším než 1mm. Rozlišení podílu těžby a spalování uhlí na hrubé frakci aerosolu lze na základě přítomnosti pyritu v aerosolu. 4. Genotoxicita a koncentrace PAU aerosolu výrazně rostou s klesajícím aerodynamickým průměrem částic aerosolu na všech lokalitách. Genotoxicita aerosolu vyjádřená na jednotku hmotnosti aerosolu je u nejjemnější frakce výrazně vyšší na lokalitě Březno. Ta je ovlivněná zejména emisemi z uhelných elektráren.

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