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李東煥,金鶴九,徐大龍,金炳淳 동의대학교 기초과학연구소 1994 基礎科學硏究論文集 Vol.4 No.1
The paramagnetic organoruthenium (Ⅲ) complexes (η^5-C_5Me_5)RuCl₂(PR₃) (PR₃=PMe₃, PEt₃,PiPr₃, PCy₃, PMe₂Ph, PMePh₂,PPh₃, P(p-C_6H₄CH₃)₃, DPPE, DPPB, Py), (2a~2k) were synthesized by the reaction of [(η^5-C_5Me_5)RuCl₂]₂(1) with 1 equivalent of the corresponding phosphines (PR₃). The effective magnetic moment (μ_eff=1.65~2.07 B.M.) derived from the magnetic susceptibility measurements of the complexes (2a~2k) were consistent with the presence of a $quot;$quot;single$quot;$quot; unpaired electron in the molecule. Treatment of dichlororuthenium (Ⅲ) complex (η^5-C_5Me_5)RuCl₂(PR₃) (2) (i) with KBr in acetone afforded the dibromoruthenium (Ⅲ) complex (η^5-C_5Me_5)RuBr₂(PR₃) (PR₃=PPh₃), (ii) with sodium amalgam in diethylether led to th bis (phosphine) derivatives (η^5-C_5Me_5)RuCl(PR₃)₂(PR₃=PMe₃, PMePh₂), and (iii) with carbonmonoxide gave to the carbonyl derivatives (η^5-C_5Me_5)RuCl(PR₃)(CO) (PR₃=PMe₃, PPh₃).
JOUNG, DAE-KI,CHOI, SUNG-HOON,KANG, OK-HWA,KIM, SUNG-BAE,MUN, SU-HYUN,SEO, YUN-SOO,KANG, DA-HYE,GONG, RYONG,SHIN, DONG-WON,KIM, YOUN-CHUL,KWON, DONG-YEUL SPANDIDOS PUBLICATIONS 2015 MOLECULAR MEDICINE REPORTS Vol.12 No.1
<P>Methicillin-resistant Staphylococcus aureus (MRSA) infection is a serious clinical problem worldwide. The aim of the present study was to examine the antimicrobial activity of oxyresveratrol (ORV) against MRSA. The antimicrobial activity of ORV was evaluated against three strains of MRSA and one methicillin-susceptible S. aureus (MSSA) strain using a minimal inhibitory concentration (MIC) assay, MTT colorimetric assay, checkerboard dilution test and time-kill assay. The MIC of ORV for all strains was moderate at 125 ?g/ml. Of note, the antimicrobial activity and fractional inhibitory concentration index values of ORV were markedly increased in the presence of a non-growth inhibitory dose of certain antibiotics. Time-kill curves revealed that a combination of ORV with ciprofloxacin or with gentamicin reduced bacterial counts to below the lowest detectable limit after 24 h. These effective combinations may be used as potential antimicrobial regimens for use in the management of MRSA.</P>
폴리이미드 중공사막을 이용한 혼합기체로부터 H2S 제거 및 CO2/CH4 분리에 관한 연구
박보령 ( Bo Ryong Park ),김대훈 ( Dae Hoon Kim ),조항대 ( Hang Dae Jo ),서용석 ( Yong Seog Seo ),황택성 ( Taek Sung Hwang ),이형근 ( Hyung Keun Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.2
In this study, by using the polymeric membrane separation process, the CO2/CH4 separation and H2S removal from biogas were performed in order to CH4 purification and enrichment for the fuel cell energy source application. Fibers were spun by dry/wet phase inversion method. The module was manufactured by fabricating fibers after surface coating with silicone elastomer. The scanning electron microscopy(SEM) studies showed that the produced fibers typically had an asymmetric structure; a dense top layer supported by a porous, sponge substructure. The permeance of CO2 and CO2/CH4 selectivity increased with pressure and temperature. Mixture gas with increasing pressure and temperature, removal efficiency of the CO2 and H2S were decreased while concentration of CH4 was increased up to 100%. When retentate flow rate was increased with the decreasing of pressure and temperature the CH4 recovery ratio in retentate side was increased while the CH4 purity in retentate side was decreased.
Sung-Ho Cho,Hui-Ryong Yoo,Dong-Ku Kim,Dae-Jin Park,Yong-Woo Rho,Kang Seo,Gwan Soo Park,Doo-Hyun Choi,Sung-Jin Song 한국자기학회 2010 Journal of Magnetics Vol.15 No.4
This paper discusses the effectiveness of high magnetization saturation in ILI (In-Line Inspection) using an MFL (Magnetic Flux Leakage) tool, and introduces a practical method for improving the magnetization level together with the piggability. Thin steel plates, replacing the conventional wire brushes were used as conductors to transfer the magnetic flux to the pipe wall. The newly designed MFL tool was compared with the conventional version by means of FEM (Finite Element Method) analysis and full-scale experiments. In the results, the newly developed magnetization system obtained a stronger MFL signal amplitude, specially 2.7 times stronger, than that obtained by the conventional magnetization system for the same defect dimensions.
서명재 ( Myung Jae Seo ),진해룡 ( Hae Ryong Jin ),임대호 ( Dae Ho Lim ),임호 ( Ho Lim ),강용 ( Yong Kang ),전기원 ( Ki Won Jun ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Size verification of small and large bubbles in a bubble column was investigated by employing the dynamic gas disengagement (DGD) method and dual electrical resistivity probe (DRP) method, simultancously. The holdups of large and small bubbles in the bubble column in a given operating condition were obtained by means of the DGD method by measuring the pressure drop variation in the column with a variation of time after stopping the gas input into the column. The size and frequency of bubbles were measured by the DRP method in the same operating condition, from which the bubble holdup of each range of size was obtained. The verification of size in determining the large or small bubbles was decided by comparing the holdups of large or small bubbles measured by the DGD method with that measured by the DRP method. Filtered compressed air and tap water were used as a gas and a continuous liquid medium. The diameter and height of the bubble column were 0.102 m and 1.5 m, respectively. The demarcation size between the large and the small bubbles in the bubble column was 4.0~5.0 mm; the demarcation size was about 5.0 mm when the gas velocity was in the relatively low range, but about 4.0 mm when the gas velocity was in the relatively high range, within this experimental conditions.