http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 강희석(Hee seok Kang) (검색결과 24 건)
- 무료
- 기관 내 무료
- 유료
-
광음향분광법을 이용한 CO 산화반응에서의 $Gd_{1-x}Sr_xCoO_{3-y}$ 촉매효과 연구
강희석,엄가원,황진수,여철현,최중길,Kang Hee-Seok,Oum Ka-Won,Hwang Jin-Soo,Yo Chul-Hyun,Choi Joong-Gill 대한화학회 1993 대한화학회지 Vol.37 No.1
An application of the optoacoustic detection method to investigate the catalytic effect of a perovskite, $Gd_{1-x}Sr_xCoO_{3-y}$ (x = 0.00, 0.25, 0.50, 0.75) system, in the oxidation reaction of CO is described. The optoacoustic signals Of $CO_2$ produced from the oxidation reaction were measured for differing x values in $Gd_{1-x}Sr_xCoO_{3-y}$. By monitoring optoacoustic signals with respect to the time, the concentration ratios of CO and $O_2$, and the temperature, the kinetic information on the catalytic properties of the perovskite for CO oxidation reaction can be obtained. The effect of Sr substitution in $Gd_{1-x}Sr_xCoO_{3-y}$ has been found to show the maximum catalytic effect at x = 0.25 and the substantial increase in catalytic activity at temperatures above 200$^{\circ}C$. It demonstrates that the optoacoustic detection method allows the investigation of the integrated catalytic effect not only for the oxidation reaction of CO, but also for many reactions, in general, by continuously and directly detecting the species associated with the reactions. CO 산화반응의 촉매로 사용되는 페로브스카이트 금속산화물인 $Gd_{1-x}Sr_xCoO_{3-y}$ (x = 0.00, 0.25, 0.50, 0.75) 계의 촉매효과를 조사하기 위하여 광음향 분광법을 사용하였다. 산화반응으로부터 생성된 $CO_2$의 광음향신호를 $Gd_{1-x}Sr_xCoO_{3-y}$에서 각각의 x값에 대하여 반응시간, 반응기체인 CO와 $O_2$의 농도비, 그리고 온도에 따라 측정함으로써 CO 산화반응의 $Gd_{1-x}Sr_xCoO_{3-y}$ 촉매 특성에 대한 정보를 얻었다. Gd1-xSrxCoO3-y에서 Gd가 Sr로 치환됨에 따른 촉매효과는 x=0.25일 때 최대로 나타났으며 반응 온도에 대하여는 200$^{\circ}C$ 이상에서 급격히 증가하는 것을 알 수 있었다. $CO_2$ 레이저 광음향분광법은 반응에 대한 연속적인 측정을 가능케 함으로써 CO 산화반응의 촉매효과 연구뿐만 아니라 일반적인 반응속도 연구에도 응용할 수 있는 방법임이 확인되었다.
-
강희석(Hee seok Kang),이대훈(Dae Hoon Lee),송영훈(Young hoon Song),유상석(Sang seok Yu) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Study for utilization of landfill gas was proposed. Portion for existing landfill gas utilization for energy source remains under 10% that is too far considering potential value of the gas. Based on the domestic landfill gas condition, reforming process by rotating arc plasma was investigated. Conversion rate of CH₄ and CO₂ determined by the amount of energy input. The main products were H₂ and CO, and representative by-product was the C₂H₂. Ratio of H₂/CO of synthesis gas range was from 1.671 to 1.699. About 2 ㎾ of energy supply is expected to result in conversion of CH₄ above 90% where specific energy density is 17.6 kJ/LCH4.
-
-
-
-
-
-
-
제주지역 주요 활엽수의 대기 중 CO<sub>2</sub> 흡수율과 수분이용효율의 계절적 변화
오순자,김현철,강희석,신창훈,고석찬,Oh, Soonja,Kim, Hyoun-Chol,Kang, Hee-Suk,Shin, Chang-Hoon,Koh, Seok Chan 한국환경과학회 2020 한국환경과학회지 Vol.29 No.2
Seasonal changes in the CO<sub>2</sub> fixation rate and water-use efficiency in the leaves of six evergreen and two deciduous broad-leaved tree species on Jeju Island, Korea, were measured using a portable photosynthesis analyzer, to identify which species are most efficient in taking up CO<sub>2</sub> from the air. The CO<sub>2</sub> fixation rate was high in the deciduous species in spring and summer and decreased in fall, whereas it was high in the evergreen species in summer and fall and decreased in winter. The rate remained high in the deciduous tree Prunus yedoensis from spring to fall (> 7.1 μmol CO<sub>2</sub>/m<sub>2</sub>/s) and in two evergreen trees, Castanopsis cuspidata var. sieboldii and Cinnamomum camphora, in summer and fall (7.0 9.9 μmol CO<sub>2</sub>/㎡/s). Therefore, these tree species fix atmospheric CO<sub>2</sub> effectively. The water-use efficiency was higher in evergreen species than in deciduous species regardless of the season. Exceptionally, it was high in the deciduous species Zelkova serrata in spring and summer (> 100 μmol CO<sub>2</sub>/mol H<sub>2</sub>O), suggesting that Z. serrata is a useful tree for dry conditions due to its tolerance of water stress. The regressions of the CO<sub>2</sub> fixation rate versus the evaporation rate and stomatal conductance were linear and non-linear, respectively. This suggests that the stomatal activity of leaves plays an important part in CO<sub>2</sub> fixation of plants. In conclusion, C. cuspidata var. sieboldii, C. camphora, and P. yedoensis should be planted along roads or in urban spaces for the greening of cities and mitigation of CO<sub>2</sub> concentrations in the air.
-
토양침적에 의한 $^{137}C_s$ 농작물 오염평가 모델
전인,금동권,강희석,최용호,이한수,이창우,Jun, In,Keum, Dong-Kwon,Kang, Hee-Seok,Choi, Yong-Ho,Lee, Han-Soo,Lee, Chang-Woo 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.4
[ $^{137}C_s$ ]의 토양침적으로 인한 농작물 오염 평가를 위한 동적격실모델이 제시되었다 토양침투(percolation), 쟁기질에 의한 토양혼합(soil mixing), 뿌리흡수(plant uptake), 용출(leaching to a deep soil), 토양고착(fixation to a clay mineral)이 모델에서 고려된 $^{137}C_s$의 주요 이동경로이며 $^{137}C_s$의 토양이동에 대한 토양특성(pH, 점토함량, 유기물함량, 이온교환성 K 농도)의 영향을 반영하기 위하여 Absalom 모델을 적용하였다. 모델의 검증을 위해 다른 토양특성을 가진 17종류의 논토양에서 2년 연속 벼를 재배하면서 수행한 $^{137}C_s$ 모의침적실험으로부터 구한 벼에 대한 $^{137}C_s$ 전이계수를 모델에 의한 예측치와 비교하였다. 측정된 벼의 $^{137}C_s$ 전이계수는 pH와 점토함량 변화에는 뚜렷한 경향을 보여주지 않았으나, 유기물함량의 증가 또는 이온교환성 K 농도의 감소에 따라 다소 증가하는 경향을 보여주었다. 측정된 전이계수는 모델에 의한 예측치와 대체적으로 유사한 값을 가졌다. A dynamic compartment model is presented to predict the contamination level of agricultural plant by $^{137}C_s$ as a result of a soil deposition. The model considered the processes of a percolation, soil mixing by a plowing before transplanting, plant uptake, leaching to a deep soil, and fixation to a clay mineral. The effects of the soil properties (pH, clay mineral, organic matter content, and exchangeable K), which are spatially varied, on a plant uptake and the leaching rates of $^{137}C_s$ in a root zone soil were modeled by the Absalom model. To test the validity of the model, the $^{137}C_s$ aggregated transfer factors(TFa) for rice plants were compared with those observed from some simulated $^{137}C_s$ soil deposition experiments, which were carried out with respect to rice plants cultivated in seventeen paddy soils of different properties for two consecutive years. Observed $^{137}C_s$ TFa values of the rice plants did not show an evident trend for the pH and clay content of the soil properties, while they increased with an increasing organic matter content or a decreasing exchangeable K concentration. Predicted $^{137}C_s$ TFa values of the rice plants were found to be comparable with those observed.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
