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섬유상활성탄에 의한 THMs 및 THMs 전구물질의 흡착특성
윤이용,이진식,한명호 대한상하수도학회 1996 상하수도학회지 Vol.10 No.1
Adsorption isotherms of three trihalomethanes(THMs: CHCl_3, CHBrCl_2 and CHBr_2Cl) and the other organics(p-chlorophenol and sucrose)on activated carbon fibers(ACFs) were measured. Adsorption capacities of the ACFs for these THMs were found to be comparable with or slightly larger than those of granular activated carbons(GACs) which have been widely used for trihalomethanes control in drinking water. Also, the breakthrough curve prediction was successfully carried out using a mathematical model on basis of the assumption that the adsorption equilibrium is instantaneously established when a THM solution contacts the ACF. In practice, THM removal from drinking water was investigated at water works using bench-scale ACF adsorption columns. The volume of water treated at a space velocity(SV) of about 100 h^-1 was approximately 40 l/g-ACF. The practical adsorption capacities of PCP and sucrose in column adsorption were in good agreement with those of theoretically calculated results using the batch adsorption measurments. And the saturation time model of these substrates in the columns was also agreed succesfully with practical measurments.
두 종모드 레이저 빛 사이의 맥놀이 신호를 이용한 간섭계에 의한 유효 광학 두께 측정
윤신영,조규만,이용산 한국광학회 1997 한국광학회지 Vol.8 No.1
서로 수직으로 편광되고 두개의 종모우드로 발진하는 주파수가 안정화된 He-Ne 레이저를 이용하여 넓은 측정 범위를 갖는 헤테로다인 간섭계를 구성하였다. 두 모우드 사이의 맥놀이 주파수인 684MHz에 대한 라디오 주파수 간섭을 이용하여 약 .+-.1.74.mu.m의 분해능으로 광학매질의 광학두께를 측정할 수 있는 장치를 구성하였다. 이와 같은 측정장치를 이용하여 Nd:YAG 레이저의 수동형 Q-스위칭에 포화흡수체로 사용되고 있는 유기염료 박막의 두께와 국부적인 광학두께의 변화에 대한 map을 구할 수 있었다. A wide dynamic range heterodyne interferometer scheme using intermode beat between a stabilized, dual frequency He-Ne laser beam has been applied for a measurement of optical thickness of an optical medium. Resolution of the optical thickness measurement is about $\pm$ 1.74 ${\mu}{\textrm}{m}$. Using this technique, we are able to determine the optical thickness of an organic dye film. We also obtain a map of the optical thickness variations over a surface of the film