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원성호,이주원,이해열 한국화재소방학회 2022 한국화재소방학회논문지 Vol.36 No.4
Fire doors are installed to prevent the spread of fire in a building, whereby gaps between the door frame and door leafare blocked using gaskets of various materials and shapes. However, there are many difficulties in ensuring the desiredperformance. This study focuses on the research and development of a double gasket that can improve the fire resistanceperformance of a no threshold fire door, in which the door frame under the fire door has been removed. This is a productthat has been researched and developed to improve fire resistance and airtightness in no threshold fire doors by connectingit to the gasket to ensure there is no breakage.
Zymomonas mobilis의 固定化에 依한 連續的 Ethanol 製造 硏究
金男紀,元省皓 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.2
Zymomonas mobilis ATCC 29191 was immobilized in 3%(wt./vol.) agar-agar gel. Kinetic behaviors of the immobilized Z. mobilis ATCC 29191 on the wall-attached film by aluminum screen were investigated in a plug flow tower reactor. Apparently the mass transfer on the film was increased with the decrease of volumetric flow rate. Athough the produced ethanol concentration at the exit of fermentor was decreased with increasing flow rate of medium, the alcohol productivity might be actually increased. In this system, the highest, ehtanol productivity(4.14g/l·hr) was achieved at the flow rate of 280ml/hr(D-0.2 hr^-1) and the highest ethanol concentration(46 g/l) was achieved at the flow rate of 45ml/hr(D = 0.03hr^-1). Immobilization of Z. mobilis by agar-agar gel offered to advantage for cell growth and it brought amounts of free cell from the immobilized cell in the film. A significant amount of fermentation was carried out in the first section of fermentor. While the intitial pH of fermentation medium was adjusted to 5.0 by 3N-NaOH solution. pH was decreased with proceeding the fermentation finally to 4.2 at D-0.4 hr^-1, 4.0 at D = 0.2hr^-1, and 3.8 at D = 0.1hr^-1 but it belonged to pH range of 3.5 to 7.5 for the growth of Z. mobilis.