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The Story of Teamwork and the Birth of the FFP* (Filter Backpack)
Fraenkl, M. ; Krbal, M. ; Houdek, J. ; Zmrhalová, Z. ; Prokeš, B. ; Hejda, P. ; Slang, S. ; Přikryl, J. ; Ondráček, Jakub ; Makeš, Otakar ; Kostyk, Juraj ; Nasadil, P. ; Malčík, P. ; Ždímal, Vladimír ; Vlček, M.
Soon after the outbreak of the coronavirus crisis in the Czech Republic and the first lockdown (2020), we enthusiastically decided to fight the coronavirus with scientific \nmeans. Originally materials engineers, we decided to develop an effective protective respiratory device, which was in short supply at the time. We soon found out, that every textile material (handkerchief 10%) has a certain ability to catch an aerosol particle carrying the corona virus, the slower the aerosol particle (d<300 nm) passes through the filter, the greater the chance it has of being caught, with the thickness of the filter, the amount of passed particles decreases exponentially and breathing resistance increases linearly. On this basis, we decided to experiment with a large-area filter placed on the user's back (it wouldn't fit anywhere else) and commercially available textile filter material.
Plný tet:  PDF
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Lidar Vertical Profile Analyzes at National Atmospheric Observatory Košetice during Volcano Eruption on La Palma Island.
Kostyk, Juraj ; Holubová Šmejkalová, A. ; Ištok, T. ; Ždímal, Vladimír
Volcanic eruptions are one of the most important sources of natural aerosol. Their negative impacts on air quality (the effects of volcanic exhaust) can be observed via long-range transport to locations far from the eruption. One of the most recent events of volcanic activity was a volcanic eruption on La Palma in the fall of 2021 (Cumbre Vieja Volcano, La Palma Island, Canary Islands, 28°36'54 ,N 17°52'07 ,W, 1,949 m a.s.l.). The impact of the volcanic eruption on air quality, which occurred 3600 km from the National Atmospheric Observatory Košetice, was studied using a combination of ground-based measurements and vertical profile analyzes. Since a new instrument (LIDAR) has extended the equipment of our station, vertical profile analyzes were performed.
Plný tet: PDF
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