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매립가스내 규소화합물류 검출을 위한 용매선택에 관한 연구
김낙주(Nack Joo Kim),최주미(Ju Mi Choi),지은정(Eun Jung Ji) 大韓環境工學會 2007 대한환경공학회지 Vol.29 No.8
본 연구는 매립가스내 siloxanes 측정의 기초 연구로서 국내 매립지를 대상으로 하여 용매흡수법으로서의 최적 용매를 선정하고자 수행하였으며, n-hexane, acetone 및 methanol을 흡수용매로 하여 각 용매의 siloxanes 검출 특성을 비교 분석하였다. 연구결과 표준물질의 GC분석에서 사용된 3가지 흡수용매 중 methanol이 용매와 silane 피크의 겹침현상이 발생하지 않아 분리능이 가장 우수하게 나타났다. 검출되는 siloxanes 농도는 흡수용매에 따라 최대 2.6배의 농도차를 보였으며, 포집유속과 포집 임핀저 단수에 대한의존성에 대해서도 높은 것으로 나타났다. Methanol은 siloxanes 총 농도가 가장 높을 뿐만 아니라 휘발성이 적어 임핀저 단별 흡수에서도 가장 이상적인 형태를 보여주었으며, 가장 낮은 상대표준편차를 나타내 실험대상 매립지에 가장 적합한 것으로 나타났다. 그러나 용매의 적합성은 매립지의 쓰레기 성상, 매립이력에 따라 다를 수 있다고 판단된다. As a preliminary measurement of siloxanes in landfill gas(LFG), this study was conducted to determine the best suitable solvent applicable to the extraction of siloxanes in the domestic landfill using liquid-absorption method. Three solvents of n-hexane, acetone, and methanol were tested and the results obtained from GC analysis for each solvent were compared to their properties. Results showed that the resolution in the GC spectrum was the best from methanol due to the lack of overlapping of the peaks between silane and solvent. The detected siloxanes concentration were varied at maximum 2.6 times depending on the types of solvent as well as extraction velocity and impinger steps. In total, the highest concentration of siloxanes was obtained from methanol, which showed ideal pattern in the absorption of each impinger step and the least relative standard deviation. Accordingly, it is concluded that methanol is the most suitable solvent for the extraction of siloxanes in the domestic landfill. However, it is considered that solvent suitability can vary depending on the waste components and landfill record in landfills.
매립된 폐목재의 셀룰로오스/리그닌 비에 의한 분해도 평가
김낙주 ( Nack Joo Kim ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.2
Degradability of landfilled wood waste is an important factor for biomethane production from solid waste landfill site. The degradability is controlled by cellulose/lignin (C/L) ratio. Test results show that the average content of cellulose in non decomposed waste wood was 40% or above and that of decomposed wood was 25% or below. Average values of cellulose/lignin ratio were measured 2.3 and 1.2 for non-decomposed and decomposed waste wood, respectively. The cellulose/lignin ratio was decreasing with the decay of landfilled wood waste.
플라스틱 가소제인 phthalate에 대한 경피 흡수 특성 연구
김낙주 ( Nack Joo Kim ),오은하 ( Eun Ha Oh ),서한슬 ( Han Seul Suh ),정광보 ( Kwang Bo Chung ),윤철훈 ( Cheol Hun Yoon ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.1
Phthalate is used in a wide range of consumer goods. It has been the subject of great public concern in recent years. It has attracted the attention of extensive uses of this material and issues regarding its safety have been raised. Phthalate is currently used through direct addition in cosmetic products and indirectly in fragrances. The material is listed in the inventory of ingredients employed as a solvent and vehicle in fragrance and cosmetic products, as well as a plasticizer, denaturant, and film former. In this study, using in vitro from Rat phthalate 3 types of skin permeation were studied using matrix such as ointment, cream and lotion in vitro. The absorption of phthalate diesters [Butyl benzyl Phthalate (BBP), dibutyl phthalate (DBP) and Diisobutyl Phthalate (DIBP)] has been measured in vitro through rat skin. Epidermal membranes were set up in Franz diffusion cells and their permeability to PBS measured to establish the integrity of the skin before the phthalate were applied to the epidermal surface. Absorption rates for each phthalate ester were determined and permeability assessment made to quantify any irreversible alterations in barrier function due to contact with the esters. Types of phthalate in vitro experimental results on DBP > DIBP > BBP quickly appeared in the following order: skin permeation was beneficial to the skin permeation small molecular weight, the difference in chemical structure, such as hydrophilic, because with the partition coefficient and solubility mechanisms and passive diffusion to increase the speed at which transmission is considered. As the esters became more lipophilic and less hydrophilic, the rate of absorption was reduced.
Dish/Stirling 시스템 적용을 위한 Hybrid 태양열 흡수기의 열특성에 관한 실험 연구
강명철,김진수,강용혁,김낙주,유성연,김진혁,Kang, Myeong-Cheol,Kim, Jin-Soo,Kang, Yong-Heack,Kim, Nack-Joo,Yoo, Seong-Yeon,Kim, Jin-Heack 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3
A Dish type solar concentrating system consists of a parabolic concentrator and a cavity receiver. In order to achieve high temperatures from solar energy, it is essential to efficiently reflect the solar rays in the concentrator and to minimize thermal losses in the cavity receiver. Improving the economical efficiency of a solar power system required the stirling unit to be operated continuously. For continuous operation of the stilting unit, the receiver must be continuously provided with thermal energy from solar as well as additional combustion heat. It is possible for a hybrid solar receiver system equipped with an additional combustion to be operated 24 hrs/day. A hybrid solar receiver was designed and manufactured for a total thermal load of 35 kW in the operating temperature range $700^{\circ}C$ to $800^{\circ}C$. The hybrid receiver system was tested in gas-only mode by gas-fired heat to investigate thermal characteristics at inclination angle varying from 0 deg to 30 deg(cavity facing down) and the aperture to cavity diameter ratios of 0(closed cavity) and 1.0(open cavity). This paper has been conducted to measure temperature distribution in cavity surface and to analyze thermal resistances, and the evaporation and condensation heat transfer coefficient in all cases(open and closed cavity).
강명철(Kang, Myeong-Cheol),김진수(Kim, Jin-Soo),강용혁(Kang, Yong-Heack),김낙주(Kim, Nack-Joo),유성연(Yoo, Seong-Yeon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
To improve economic of solar power generation, stirling engine is required continuous operation and the receiver has to be provided with an additional combustion system. The hybrid receiver with a specially adapted combustion system is possible to 24 hr/day operation by solar and gas-fired. The inner cavity and external wall serve as absorber surfaces using collected irradiation and heat transfer surfaces for the gas heat flow, respectively. The hybrid receiver was designed and fabricated for the dish/stirling system. The analytical method for pridicting natural convective heat loss from receiver is used. The Koenig and Marvin model is used to estimate convection heat loss and heat transfer coefficiency.