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박진식,문추연,김동일 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(A)
In this study, sewage were treated with Two-step Aeration System, it was analyzed treatment efficiency by hydraulic retention time(HRT) in a 2nd. aeration basin. As to the increase of HRT 4∼10hr in a 2nd. aeration basin, treatment efficiency was increased but in consideration of economical efficiency, HRT 8hr was most stable. At Two-step Aeration System of HRT 8hr, BOD treatment efficiency were 90.1%, 84.6%, respectively. At Two-step Aeration System of HRT 8hr, range of F/M ratio was 0.11∼0.17kg·BOD/kg·MLSS.d. At Two-step Aeration System of HRT 8hr treatment efficiencies and effluent concentrations of NH₄^+-N and PO₄-P were 57.3%, 10.5mh/l and 33.9%, 1.74mg/l, respectively.
부레옥잠과 미나리를 이용한 연속식 하수처리에서 COD, N 및 P의 제거
박진식 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2
본 연구에서는 농어촌취락배수의 효율적 처리를 위해 수생식물인 부레옥잠과, 미나리를 이용한 연속식 실험에서 유기물부하(COD)와 Total N, Total P 등을 HRT와 농도를 달리하여 그 제거효율을 측정하였다. 유기물(COD)의 제거효율은 HRT가 2day인 부레옥잠조에서는 평균 50%의 제거율을 보였으며, 미나리조에서는 HRT 1.2~2 day동안 30~50%의 제거율을 보였다. 영양염류의 제거효율은 총 질소의 경우 부레옥잠조는 약 32.9 kg N/ha·day의 부하에서 HRT 2~3 day인 경우 40~53%가 제거되었으며, NH_4^+-N의 제거효율은 평균 52%로 Total N의 제거효율보다 다소 높았으며, 인은 8.2 kg P/ha·day의 부하에서 HRT 2~3 day인 경우 31~40%로 조사되었다. N 및 P 흡수율은 미나리보다 부레옥잠이 높게 나타났으며, 인의 흡수율은 질소의 흡수에 비해 낮게 조사되었다. This study was carried out to investigate sewage treatment efficiencies using water hyacinth (Eichhornia crassipes) and watercress (Oenanthe javanica). In the hyacinth system, about 30% of COD introduced was removed during 2 days of hydraulic retention time, and about 30~50% of COD was removed in the watercress system during 1.2~2 days of hydraulic retention time. Therefore, COD loading of 76~170 kg COD/ha·day was removed during 2~3 days of hydraulic retention time at the 0.18 ㎡ area in the water hyacinth-watercress continuous system. Also 40~50% of N and P in the sewage were removed in the tested water hyacinth-watercress system. Although COD, N and P concentrations in the final effluent were still higher than the limits of waste discharge, applicability of this waste water treatment system should be further investigated as an alternative method for small scale sewage treatments.
초기 함수율 조절이 음식물쓰레기의 발효사료화에 미치는 영향
박진식,정경원,김수생 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
The purposes of this study were to determine the optimum fermentation process for the feed production of garbage and estimate the practical value of fermented feed using kudzu creeper and sawdust as bulking agent. This study considered initial moisture contents, control as the fermentation process variables. The results are summarized as follows. To, solve the dewatering and sanitary problems and maintain the proper moisture contents and aerobic condition, this garbage fermentation process used kudzu and sawdust as bulking agent. The effective fermentation could be achieved at the moisture contents of 60% with bulking agent. Optimum condition of fermentation consists of moisture contents. For optimum fermentation of gravitationally dewatered garbage, the proper mixing ratios of kudzu(moisture contents : 17.3%) and sawdust (moisture contents : 13.2%) were 41% and 39%. respectively.
Design Study for the KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) at RAON
박진식,권영관,문준영,Tetsuro Komatsubara,정인일,김용학,윤종철,김용균,Seigo Kato,문창범,채경육,Shigeru Kubono 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
The KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) is a multi-purposerecoil spectrometer for low-energy nuclear experiments at the RAON accelerator complex. It isdivided into two stages based on the operational function: the first stage (F0-F3) is an in-flightseparator or beam transport line, and the second stage (F3-F5) is a large acceptance spectrometer. For spectrometers using radioactive ion (RI) beams, high performance, such as high resolutionand large acceptance, are especially required due to the limit of quality of RI beams. In thisrespect, a dispersion-matching technique and a movable magnet system were employed for highresolution and large acceptance, respectively. Reaction spectra at the focal plane for the dispersionmatching mode were obtained and analyzed using a Monte Carlo simulation code. In addition, thegeometrical angular acceptances with respect to the distance between the reaction target and thefirst Q-pole doublet of the second stage were calculated, and the expected maximum solid angle ofthe spectrometer was estimated.