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Estimation of the distribution of groundconcentrations from point sources in complex terrain-by simulation in the wind-tunnel
Plášilová, Eva ; Keder, Josef (referee) ; Zelinger, Zdeněk (advisor)
Estimation of the distribution of ground concentrations from point sources in complex terrain - by simulation in the wind-tunnel Eva Plasilova 2009 - Charles University in Prague Faculty of Mathematics and Physics Department of Meteorology and Environment Protection V Holesovickach 2 18000 PrahaS Academy of Sciences of the Czech Republic Institute of thermomechanics, v. v. i. Dolejskova 5 18200 PrahaS Abstract of rigorousthesis Task of this work has been to monitor the behaviour and to estimate the concentration of pollutants in atmosphere. To-this purpose was selected as a model town Jablonne nad Orlici and as a technical solution to the problem was physical modeling in the wind-tunnel (in scale 1:1000). First of all, I define important terms (mainly turbulence, atmospheric boundary layer), equations: that describe atmospheric motions, and give account of wind-tunnel and methods of measurement. I estimated the concentrations above the ground qualitatively (vissually - using laser knife) and quantitatively (using the infrared analyzer IREX and the flame ionization detector FID). . High imission load in a densely settled part of the town Jablonne nad Orlici was demonstrated. From the theoretical point of view I tested the influence of the complex terrain and of the source-parameters on the dispersion of...
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Gas photoacoustic detection and its possible application in monitoring of foundry technologies
Herecová, L. ; Nevrlý, Václav ; Zelinger, Zdeněk ; Střižík, Michal ; Kozubková, M. ; Danihelka, P.
To improve occupational health & safety as well as process quality control, many foundry enterprises can be interested in application of new and effective techniques of gas monitoring due to a lot gaseous secondary compounds produced within such processes, e.g. during thermal degradation of organic binders in casting process. Generally, gas monitoring can just be performed as effective as possible when a sufficiently universal, sensitive and selective method of a broad dynamic range is available. The CO2-laser photoacoustic detection technique can represent such a monitoring tool, useful also for foundry industrial technologies. Its basic principles, description of instrumentation and possible applications in foundry technologies are discussed in our contribution.
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Sodar measurements used in an interpretation of dial data
Střižík, Michal ; Bezpalcová, Klára ; Engst, P. ; Jaňour, Zbyněk ; Keder, J. ; Šeděnková, Hana ; Zelinger, Zdeněk
Remote sensing techniques are nowadays widely used next to classical in-situ measurements for studying properties of atmospheric boundary layer (ABL). Doppler SODAR (Sound Detection and Ranging) was introduced to skilled public for the first time around 1975 and today is used in routine investigations of thermal structure, turbulence and vertical mass movement in ABL. It is also used for estimation of mixing layer height and for continuous monitoring of wind speed and direction. Application of REMTECH Doppler SODAR PA2 system as a support tool for studying pollutant dispersion in ABL is demonstrated on model studies performed in urban and suburban areas with use of combined mobile detection system DIAL LIDAR 510M / SODAR PA2.
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