• 제목/요약/키워드: S-47

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Pseudomonas aeruginosa KS47에 의한 절삭유의 생물학적 분해 (Biodegradation of Cutting Oil by Pseudomonas aeruginosa KS47)

  • 김란희;이상섭
    • 미생물학회지
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    • 제44권1호
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    • pp.22-28
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    • 2008

  • 본 실험은 생분해가 어려운 절삭유를 단일 균주에 의해 생물학적 처리를 하는 데에 목적이 있다. 절삭유, 절삭폐유로부터 호기 균주 81개를 분리하여 이중 절삭유 분해능이 가장 높은 균주로, 48시간 내에 90.4%를 제거한(초기농도 699.1 mg/L) KS47을 선별하였다. KS47은 형태학적, 생리 화학적, 16S rDNA 염기서열, 그리고 지방산 분석을 통해 Pseudomonas aeruginosa로 동정되었다. P. aeruginosa KS47은 절삭유를 탄소원으로 사용하여 성장 할 수 있었으며, 절삭유 분해시, 최적 분해 조건은 1.5 g/L(wet weight), pH 7.0, $30^{\circ}C$이었다. 최적 조건 하에서 절삭유의 제거능을 본 결과, 1,060 mg/L의 절삭유를 12시간 내에 83.7% 제거함을 확인하였다.

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Solvolysis of Phenylacetyl Chlorides in Methanol-Acetonitrile Mixtures

  • 이익춘;허철;이혜황
    • Bulletin of the Korean Chemical Society
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    • 제10권1호
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    • pp.47-50
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    • 1989

  • The methanolysis reactions of phenylacetyl chlorides have been investigated in methanol-acetonitrile mixtures at temperatures ranging - $15.0-0.0^{\circ}C.$ Substituent and solvent effects on the rate supported an associative $S_N2$ mechanism for the solvolysis. Activation parameters indicated that the reaction is entropy controlled, while the a/s ratios of the Taft's solvactochromic correlation proved to be remarkably constant with a typical value of 0.50 that is consistent for the reactions proceeding by a typical $S_N2$ path.

  • https://doi.org/10.5012/bkcs.1989.10.1.47 인용 PDF

단열관을 위한 원통 환상공간 내에서의 복합 열전달 (Conjugate Heat Transfer in Cylindrical Annulus for an Insulated Tube)

  • 강병희;양성환;권순석
    • 설비공학논문집
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    • 제7권4호
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    • pp.633-641
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    • 1995

  • The effect of the gap width on conjugate heat transfer in the cylindrical annulus for an insulated tube has been studied numerically by the finite difference method. The parameters considered here are the Rayleigh number, Ra, the dimensionless insulated wall thickness, $W/D_i$ and the dimensionless gap width, S/W. As S/W increases, the mean wall temperature increases at the inside wall of annulus and decreases at the outside walls of annulus and the insulated tube at $S/W{\leq}0.5$, and then slightly increases at $Re=10^4$, $W/D_i=1.47$. The heat transfer rate decreases at $S/W{\leq}0.5$ and then increases apparently as S/W increases at $Re=10^4$, W/Df=1.47. Therefore, it is considered that $$S/W{\sim_=}0.5$$ is the optimum gap width for the effect of insulation at $Re=10^4$, $W/D_f=1.47$.

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