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비정상상태 유동층 CVD 반응기에서의 입자 크기 분포의 모사
박대원,이광순,강신이,윤풍 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.6
본 연구는 비정상상태 유동층 CVD반응기내에서의 입자 성장에 관한 것으로 실란(SiH₄)가스의 열분해에 의해 생성된 고순도 다결정 실리콘이 반응기내에 주입된 실리콘 입자의 표면에 증착하여 입자가 성장하는 과정에 있어서의 입자 성장 속도 및 입도 분포에 관하여 모델을 설정하고 모사를 행하였다. 모사 결과 입자크기 분포는 반응기에 주입된 입자들의 초기 분포에 큰 영향을 받았으며 시간의 경과에 따라 입도 분포의 범위가 넓어짐을 알 수 있었다. 또한 모사 결과와 실험 결과를 비교하여 모델이 유동층 반응기내에서의 입자성장 예측에 적합함을 입증하였다. A model was established to predict the particle size distribution and the particle growing rate in an unsteady state CVD fluidized bed reactor, in which high purity polycrystalline silicon particles were grown by a pyrolysis of silane gas(SiH₄) and chemical vapor deposition (CVD) on seed particles. It was concluded from the simulation that particle size distribution is influenced by the initial size distribution of particle which was introduced in the fluidized bed and the size distribution is broadened as time elapses. It was found from the comparison between the model simulations and the experimental results that the model predicts the particle growing rate and operation conditions for fluidized bed reactors accurately.
박대원,정종식,박대철,박병기 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.6
여러 가지 Mo 촉매 존재하에서 allyl chloride를 tert-butyl hydroperoxide로 액상 epoxidation시키는 연구가 회분식반응기를 이용하여 이루어졌다. 반응은 1,1,2,2-tetrachloroethane 용액중에서 반응온도 53-76℃, 상압, 촉매농도 1.5×10^(-3)몰의 조건에서 수행하였으며, MoO₂(acetylacetone)₂와 MoCl_5가 활성 및 선택성면에서 가장 좋은 촉매로 나타났다. Epoxidation은 부반응 생성물인 tert-butyl alcohol, 피리딘 등과 같은 Lewis 염기에 의하여 매우 심하게 활성이 저하되었다. MoO₂(acetylacetonate)₂ 촉매계에 대한 반응속도 자료를 얻었으며, Michaelis-Menten 속도론으로 나타낼 수 있었다. Homogeneous liquid phase epoxidation of allyl chloride with tert-butyl hydroperoxide was carried out in the presence of various Mo catalysts in a batch reactor. The reaction has been carried out at 53-76℃ and 1 atm with 1.5×10^(-3) ㏖/liter of catalyst in 1,1,2,2-tetrachloroethane solution. MoO₂(acetylacetonate)₂ and MoCl_5 were found to be the most active and selective catalyst. The epoxidation was strongly inhibited by Lewis base such as tert-butyl alcohol, pyridine and water. Kinetic data were obtained for the MoO₂(acetylacetonate)₂ catalyst system and could be represented by Michaelis-Menten kinetics.
박대원,백경란,정문현,이진서,박윤수,김효열,이미숙,Jung Yeon Kim,염준섭,김민자 대한의학회 2012 Journal of Korean medical science Vol.27 No.5
The efficacy and safety of ertapenem, 1 g once daily, were compared with that of ceftriaxone, 2 g once daily, for the treatment of adults with acute pyelonephritis (APN)and complicated urinary tract infections (cUTIs) in a prospective, multicenter, doubleblinded,randomized study. After ≥ 3 days of parenteral study therapy, patients could be switched to an oral agent. Of 271 patients who were initially stratified by APN (n = 210) or other cUTIs (n = 61), 66 (48.9%) in the ertapenem group and 71 (52.2%) in the ceftriaxone group were microbiologically evaluable. The mean duration of parenteral and total therapy,respectively, was 5.6 and 13.8 days for ertapenem and 5.8 and 13.8 days for ceftriaxone. The most common pathogen was Escherichia coli. At the primary efficacy endpoint 5-9 days after treatment, 58 (87.9%) patients in the ertapenem group and 63 (88.7%) in the ceftriaxone had a favorable microbiological response. When compared by stratum and severity, the outcomes in the two groups were equivalent. The frequency and severity of drug-related adverse events were generally similar in both treatment groups. The results indicate that ertapenem is highly effective and safe for the treatment of APN and cUTIs.