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윤여일,김명욱,김성현 한국공업화학회 1999 응용화학 Vol.3 No.1
A natural manganese ores were selected as the raw material of the desulfurization sorbents because of a many useful component for desulfurization and economic merits. The experiments were performed to investigate the reactivity of the sulfidation and regeneration in a fixed bed reactor and were characterized by using the XRD and TGA. But, it was prepared with mixing additives to raise it because the regeneration efficiency was poor.
Yoon, Ho-Il,Kim, Yea-Dong,Park, Byong-Kwon,Kang, Cheon-Yun,Bae, Sung-Ho,Yoo, Kyu-Chul Korea Institute of Ocean ScienceTechnology 2002 Ocean and Polar Research Vol.24 No.3
We used diatom and porewater data of two piston cores from the central subbasin and one from the western subbasin in the Bransfield Strait in the northern Antarctic Peninsula to elucidate the depositional mechanism of the layered diatom ooze. The layered diatom ooze is characterized by an abundance of organic carbon, biogenic silica, sulfde sulfur, and lower porewater sulfate concentration. This lack of pore-water sulfate concentration in the diatom ooze interval may reflect development of reducing micro-environment in which bacterially mediated sulfate reduction occurred. The negative relationship between the total organic carbon and sulfate contents, however, indicates that sulfate reduction was partly taking place but does not control organic carbon preservation in this unit. Rather, well-preserved Chaetoceros resting spores in the layered diatom ooze indicate a rapid sedimentation of the diatom as a result of repetitive iceedge blooms on the Bransfield shelf during the cold period (around 2500 yrs BP) when the permanent seaice existed on the shelf, During this period, it is expected that the downslope-flowing cold and dense water was also formed on the Bransfield shelf as a result of sea ice formation, playing an important role for the formation of layered diatom ooze in the Bransfield subbasins.
Implication of the Change in Overturning Circulation to the LGM CO<sub>2</sub> Budget
Kim, Seong-Joong,Lee, Bang-Yong,Yoon, Ho-Il,Kim, Yea-Dong Korea Institute of Ocean ScienceTechnology 2004 Ocean and Polar Research Vol.26 No.3
The observational proxy estimates suggest that the North Atlantic overturning stream function associated with the North Atlantic Deep Water (NADW) production and outflow was substantially weaker during the last glacial maximum (LGM) than that observed under present conditions. The impact of the changes in overturning circulation on the glacial carbon budget is investigated using a box model. The carbon box model reveals that the atmospheric $CO_2$ concentration is more sensitive to change in the overturning circulation of the North Atlantic than that of the Southern Ocean, especially when North Atlantic overturning becomes weaker. For example, when the strength of the North Atlantic overturning circulation is halved, the atmospheric $CO_2$ concentration is reduced by 50ppm of that associated with the accumulation of $CO_2$ in the deep ocean. This result implies that a weaker North Atlantic overturning circulation may play an important role in the lowering of LGM atmospheric $CO_2$ concentration.
고정층 반응기에서의 고온건식 탈황공정 모사에 관한 연구
김성현,신상백,윤여일 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
석탄가스에 포함되어 있는 황화수소를 제거하기 위한 우수한 탈황제로 아연계 및 철계 탈황제를 선정하였고, 이들 탈황제의 성능을 모사가스를 이용하여 고정층에서 400-700℃ 온도범위에서 평가하였다. 그리고, 고정층 실험에 의해 구해진 황화수소 파괴곡선을 grain mode과 unreacted core model을 이용하여, 유효확산계수를 조절 가능한 변수로 선택하여 fitting 하였다. 두 모델 모두 실험에 의해 구해진 파괴곡선과 비교적 잘 일치되는 파괴곡선을 보여주며, 이를 통해 각 탈황제에 대한 유효확산계수를 Arrhenius식 형태로 나타냄으로써 생성물층을 통한 확산에 대한 겉보기 활성화 에너지와 빈도인자를 구하였다. Zinc and iron-based sorbents were considered as prime candidate sorbents to remove H₂S in coal-derived gas. The performance of sorbents was tested at temperature range of 400-700℃, in a fixed-bed reactor using the simulated coal gas, Ten, the effective product-layer diffusion coefficient, D_e was estimated from the best-fittings of the experimental breakthrough curves and simulated breakthrough curves by the grain model and unreacted care model, respectively. These two models showed that the predicted and experimental breakthrough curves were in goad agreement. Apparent, activation energies and frequency factors were obtained for the product-layer diffusion coefficient of various sorbents by plotting in Arrhenius farm.
박성호,윤여일,김성현 ( Seong Ho Park,Yea Il Yoon,Sung Hyun Kim ) 한국공업화학회 1997 공업화학 Vol.8 No.5
암모니아와 금속염과의 기-고 반응을 이용한 화학열펌프에서 열전달 특성과 물질전달 특성을 개선하기 위하여 금속염을 팽창흑연에 반지름 방향으로 겉보기 밀도가 증가하도록 함침시켜 새로운 비균일 열전도성 반응블럭을 제조하였다. 이것은 겉보기 밀도가 반지름 방향으로 165, 222, 279, 337, 394(kg/m³)로 증가하도록 만든 것으로 균일 열전도성 반응블럭과 반응특성을 비교하였다. 실험결과 열전달특성은 비균일 열전도성 반응블럭이 훨씬 좋았고, 반응을 반복함에 따라 물질전달과 반응특성이 개선되었으며 반응의 재현성도 양호함을 알 수 있었다. The nonuniform thermal conductive reaction blocks were manufactured by impregnation of metal salts on the expanded graphite to improve the heat and mass transfer ability of reaction block for the chemical heat pump using the reaction of ammonia and metal salts(halide). The nonuniform blocks were designated to increase apparent density, like 165, 222, 279, 337, 394 kg/m³ radially. The experimental results showed that the heat transfer characteristics of nonuniform blocks were better than uniform blocks. As the reaction of ammonia repeated, the volumetric expansion in the reaction block makes the mass transfer improve, and the reproducibility better.
Relationship of hepatic venous pressure gradient and prognosis in patients with Liver cirrhosis
Moon Young Kim,Soon Koo Baik,Yoon Ok Jang,Ki Tae Suk,Chang Jin Yea,Il Young Lee,Hye Jung Kim,Hearn Kook Kim,Kyoung Won Park,Jae Woo Kim,Hyun Soo Kim,Sang Ok Kwon,Soon Ho Um,Kwang Hyub Han 대한간학회 2008 Clinical and Molecular Hepatology(대한간학회지) Vol.14 No.3(S)
H<sub>2</sub>S제거를 위한 아연계 탈황제 제조 및 반응특성 연구
이창민,윤여일,김성현,Lee, Chang Min,Yoon, Yea Il,Kim, Sung Hyun 한국공업화학회 1999 공업화학 Vol.10 No.2
Zinc-based sorbents for $H_2S$ removal were prepared. The reactivity of sorbents was investigated by the successive cycles of sulfidation-regeneration at $650^{\circ}C$ in a fixed bed reactor. The desulfurization sorbents were prepared with granulation method to produce a spherical pellet with good attrition resistance. The fresh and reacted sorbents were characterized by X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS) and the characteristics of sorbents on calcination conditons were analysed by Mercury Porosimetery and BET. The reactivity of sorbents decreased as the number of sulfidation-regeneration cycle increased. It is due to the zinc loss and the increase of the diffusion resistance by sintering, cracking and spalling of sorbents at the high temperature. $H_2S$를 제거를 위한 아연계 복합금속산화물 탈황제를 제조하고 반응특성을 연구하였다. 최적 황화반응 온도인 $650^{\circ}C$의 고정층에서 탈황-재생의 연속 cycle에 따른 반응성을 관찰하였다. 내마모성 향상을 위한 구형입자의 탈황제를 제조하기 위해 Granulation방법을 이용하였다. XRD와 XPS분석에 의해 zinc titanate결정생성을 확인하였고 소성조건에 따른 탈황제의 특성을 분석하기 위해 mercury porosimetry와 BET분석을 행하였다. Cycle이 증가함에 따라 고온에서의 zinc loss와 sintering, cracking, 그리고 spalling에 의한 탈황제의 확산저항의 증가로 인해 반응성은 떨어졌다.