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화학센서 / 수정진동자 미량저울을 이용한 공기 중 먼지의 온라인 측정
최광재(Kwang Jae Choi),김영한(Young Han Kim),장상목(Sang Mok Chang) 한국센서학회 1999 센서학회지 Vol.8 No.4
The measurement of solid particles suspended in air is conducted with a quartz crystal microbalance. The measurement system is connected to a personal computer and multiple sensors are utilized to make simultaneous measurement possible. In this paper, the detail of experimental setup is extensively explained for the possible future application of the system in other areas. It is found that the measurement system is suitable for an on-line continuous determination of the concentration of solid particles in air.
시토크롬 C의 전기화학반응에 있어서 프로모터와 전해질과의 영향
최광재,조홍식,이행자,장상목,김영한 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1
The electrochemical reaction of cytochrome C varied with promotors and electrolytes. Among electron transfer carriers, 4-4' bipyridine(PyPy) showed good redox response using 20 mM phosphate solution as electrolyte and the case of Bis(4 pyridyl) bisulphide(PySSPy) as promotor showed same result using 0.2M Sodium cacodylate as electrolyte tested cyclic voltammetry method. Between electrodes, Au electrode is better behaviour than ITO electrode. 0.21M Tris, 0.24M Cacodylate acid showed the most effective electrochemical characteristics as electrolyte.
입상활성탄에 의한 BTX 및 활로겐화알칸의 기상흡착특성
이행자,정영언,최광재,손진언 東亞大學校 大學院 1993 大學院論文集 Vol.18 No.-
Gas phase adorption characteristics of BTX and halogenated alknaes vapor onto granular activated carbon in the fixed bed were investigated by experimentally. The following results were obtained. 1. For vapor of GAC-BTX and GAC-halogenated alkanes systems, uptake curves were obtained at 298K at various concentration range. 2. Capacity of adsorption of solvents vapors onto granular activated carbon was in the order as follows: ① BTX: m-Xylene> toluene> Benzene> 0-Xylen ②. Halogenated alkanes : CHCl₃>CCl₄>CH₂CL₂ 3. Kangmuir coefficient of each components were shown the TAble 3. 4. RElation of amount adworbated versus surface diffusivity coefficient was obtained like equation D?=a + bq and coefficient a and b were shown the Table 7.
김재원,최광재 대한금속재료학회(대한금속학회) 1968 대한금속·재료학회지 Vol.6 No.2
The kinetics regarding to the pressure leaching of pyrite ores at elevated temperature and pressure was investigated. The leaching rates were proportional to the oxygen partial pressure, temperatures and the specific surface area of the sample, and were independent of the concentration of the sulfuric acid. The activation energy of the domestic pyrite ores for pressure leaching was 10.1 kcal. per mol. Pyrite ores were completely decomposed into free sulfur and ferrous or ferric sulfate when leaching was carried out for 4 hours at 115℃ under 20 atom, of oxygen partial pressure in dilute sulfuric acid solutions. Some electrolytic effect was briefly tested by applying anodic current during the pressure leaching at a means of accelerating the rate of leaching. It was proved that the combination method of acid leaching and anodic dissolution was effective for pressure leaching of pyrite ores.