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과산화수소에 의한 황화물의 산화에 있어서 중간물로써의 폴리설파이드의 반응속도와 메커니즘
尹哲善 동아대학교 환경문제연구소 1987 硏究報告 Vol.10 No.1
The absorbance of polysulfides being formed and decaying with time has an inflection point near the start of the reaction, then a maximum, and finally a second inflection point. The polysulfide formation and decay through the oxidation of sulfide at concentrations ranging from 2×10^(-3)M to 3×10^(-3)M with hydrogen peroxide at concentrations ranging from 3×10^(-2)M to 5×10^(-2)M at pH 8.0 and 8.6 were measured with a stopped-flow spectrophotometer. The instantaneous maximum conversion to polysulfides ranges from 38 to 78%. The kinetic parameters were determined with the initial rate method. The rate of sulfide consumption due to polysulfide formation and decay is determined to be d[∑S^(2-)]/dt=k₁[∑S^(2-)]^(0.)7[H₂O₂]^(1.1)-5k₂[∑S^(2-)_(χ)]^(0.7)[H₂O₂]^(0.4), where χ is the polysulfide index. The rate constants, k₁ and k₂, at pH 8.0 are higher than those at pH 8.6.
尹哲善 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-
Numerical values are presented for the temperature field and velocity field for the boundary layer in thermal radiation absorting and emitting non-Newtonian media. These results were obtained by solving the partial differential equations describing the conservation of mass, momentum, and energy on a computer with finite difference methos in time dependent form. As the Stark number N decreases, both the thickness of temperature boundary layer and that of velocity boundary layer increase. As the power in non-Newtonian shear stress equation, n decreases, these effects were accelerated.
尹哲善 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
A numerical solution for the radiation effects on non-Newtonian natural convection is presented. The explicit method finite difference technique used was first developed by J. D. Hellums.
尹哲善 동아대학교 환경문제연구소 1990 硏究報告 Vol.13 No.1
The adsorption isotherms for chloroform and 1, 2-dichloroethane on soils were determined. The soils used were bentonite, Gimhae series, Daegu senies, and Sadu Series. The aqueous mixture of pollutant and soil in a tube was mixed for 24 hours in a reciprocating shaker. The solid phase was separated from the liquid phase by centrifugation and the remaining solution was determined by a gas chromatograph. The Freundlich adsorption capacity for chloroform on bentonite was found to be one thirty fourth of the Freundlich adsorption capacity for chloroform on granular activated carbon. For 1, 2-dichloroethhane it was found to be one forty oneth. The other soils also were appeared to be useful for the removal of chloroform and 1, 2-dichloroethane.