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Purification of Flue Gas by Means of Membranes.
Bobák, M. ; Žitková, Andrea ; Vejražka, Jiří ; Červenka, Vojtěch ; Maršálek, J. ; Izák, Pavel
The aim of this work is to test our new patented method of water condensing membrane for flue gas purification. Moreover, our objective is also to compare our unique separation method with polymeric membranes being nowadays developed primarily for carbon capture (CC). Nevertheless, these membranes and whole CC technology have also solve the problem of the other pollutants like SO2, NOx and HX. We would like to find out whether the new separation method could be as efficient as the current polymeric membranes represented by the results of several academic investigations and pilot tests performed by membrane producers. It seems that it would be very advantageous and reasonable to develop the process combining efficient SO2, NOx, HX removal and water recovery but not necessarily with CO2 removal as CC will be possible only on sites where it could be further processed. Thus, there could be also a demand for the efficient technology without CC to be combined with current flue gas purification systems especially on smaller scales.
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Risk factors of HPV infection and head and neck tumours
Sekavová, Alžběta ; Tachezy, Ruth (vedoucí práce) ; Bobák, Martin (oponent)
Epidemiologie nádorů hlavy a krku je v součastnosti intenzivně studovaným tématem. Nedávný posun věku incidence do mladších věkových kategorií je připisován vzůrstajícímu podílu nádorů hlavy a krku, které jsou způsobené lidským papilomavirem - sexuálně přenosným virem, který navozuje asymp- tomatické a někdy persistující infekce, které pak mohou vést k nádorové transformaci infikované tkáně. Lepší prognóza pacientů s nádory hlavy a krku indukovanými virovou infekcí a také preventabilita infekce lidským pa- pilomavirem jsou hlavní důvody pro intenzivní studium této problematiky. Prvním cílem této práce je ukázat epidemiologické trendy nádorů hlavy a krku v České republice s důrazem na změny věkově-specifické indicence a úmrtnosti během posledních tří dekád. Druhá část práce si klade za cíl iden- tifikovat rizikové faktory infekce lidským papillomavirem v dutině ústní a také rizikové faktory nádorů hlavy a krku. K této studii případů a kontrol a průřezové studii je využita nemocniční kohorta. 1
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Preparation and Characterization of Micro- and Nanocellular Polystyrene Foams
Nistor, A. ; Rygl, A. ; Sajfrtová, Marie ; Bobák, M. ; Kosek, J.
Polystyrene foams with closed cells were prepared using supercritical CO2 as the blowing agent. On the other hand, polystyrene foams with open cells were prepared via temperature induced phase separation, namely by the spinodal decomposition. In both cases, we systematically studied the influence of the foaming conditions (focusing especially on nucleation and coalescence) on the final foam morphology. The influence of solvent residua on foaming was discussed in. By carefully optimizing the foaming conditions we prepared foams with an average cell size below 1 μm. Furthermore, we studied the heat insulation properties of the prepared foams and compared them with the results of heat transport simulation in foams.
Plný tet: SKMBT_C22014090110372 - PDF
Plný text: content.csg - PDF
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Micro- and Nanocellular Polymer Foams – Insulation Material of the Future
Nistor, A. ; Rygl, A. ; Bobak, M. ; Sajfrtová, Marie ; Kosek, J.
In the polymer foam industry, emphasis is placed on improving foam properties and making the production process more sustainable and ecological. By reducing the cell size of polymer foams below tens of micrometres we can improve their heat insulation properties and save material. Such polymer foams are called micro- or nanocellular foams depending on the range of their cell size. Micro- and nanocellular foams can be prepared by pressure induced foaming with high pressure CO2. We studied the influence of the foaming conditions on the final foam structure with the aim of achieving the cell sizes as small as possible, having a narrow cell size distribution and reaching the bulk porosity above 90 %. The foam morphology was analysed by Scanning Electron Microscopy and Atomic Force Microscopy. Some morphology visualisations were also made by X-ray micro-tomography, but these visualisations are not demonstrated in this contribution.
Plný tet: SKMBT_C22013102415151 - PDF
Plný text: content.csg - PDF
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