http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
콜타르 기반 등방성 피치 섬유의 산화안정화 공정에 대한 오존 처리 영향
양재연,고재경,윤광의,서민강,Yang, Jae-Yeon,Ko, Jae-Kyoung,Yoon, Kwang-Eui,Seo, Min-Kang 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.5
In this work, we performed ozone treatment of isotropic pitch fibers to optimize the duration and temperature during the stabilization process. The treatment worked effectively for long-term and high-temperature stabilization. The isotropic pitch fibers were ozone-treated at different ozone concentrations of 10, 20, and 30 mg/l. The surface properties of the isotropic pitch fibers were analyzed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy, while their structural characteristics were examined using X-ray diffraction. The experimental results indicated that the surface oxygen functional groups (COOH, OH, and CO) and oxygen concentration of the pitch fibers increased after the ozone treatment. During the oxidative stabilization process, the cross-linking reactions of the oxygen functional groups formed the thermosetting pitch, as confirmed by the replacement of hydrogen with oxygen. Additionally, it was observed that the ozone treatment could improve the optimized oxidative stabilization procedure in carbon fiber manufacturing. Therefore, the ozone treatment played an important role in optimizing the oxidative stabilization procedure of the pitch fibers.
토양의 유효태 인산과 치환성 양이온의 다성분동시추출 분석방법 비교
김명숙(Myung-Sook Kim),양재의(Jae Eui Yang),김유학(Yoo-hak Kim),윤정희(Jung-Hui Yoon),장용선(Yong-Seon Zhang),곽한강(Han-Gang Kwak),하상건(Sang-Keon Ha),현병근(Byung-Keun Hyun) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.3
과학영농과 친환경농업이 대두되면서 토양검정량이 급속하게 증가하고 이에 대처하기 위해 신속하게 분석할 수 있는 분석 방법이 요구되고 있다. 따라서 본연구에서는 신속·간편하게 분석할 수 있는 다성분동시추출방법으로 개발된 Mehlich Ⅲ법, Mod. Morgan법, Kelowna 법과 국내에서 사용 중인 유효태 인산분석법인 Lancaster법 , 치환성 양이온 분석법인 1MNH4OAc법으로 분석되는 분석치들 간의 상관관계를검토하기 위하여 토양특성이 다양한 우리나라 농경지115개소에서 토양을 채취하여 여러 가지 방법으로 화학적 분석을 실시하였다. 다성분동시추출 분석방법인 Mehlich Ⅲ법, Mod. Morgan법, Kelowna법과 기존의 유효인산 분석방법인 Lancaster법과 치환성 양이온 분석방법인 1M NH4OAc법으로 추출한 분석치는 모두 고도로 유의한 직선적인 상관관계에 있었다. 유효인산은 Mehlich Ⅲ법, Mod. Morgan법, Kelowna 법과 Lancaster법으로 추출되는 분석치간에 결정계수(R<SUP>2</SUP>)의 크기는 MehlichⅢ법(0.979<SUP>***</SUP>) > Kelowna법(0.977<SUP>***</SUP>) > Mod. Morgan법(0.553<SUP>***</SUP>)의 순으로 MehlichⅢ 법 이 상 관 이 가 장 높 게 나타났고 Lancaster 법보다 토양 중의 인산을 평균적으로 28% 많이 추출하였다. 치환성 양이온에서도 화산회 토양에서 추출되는 나트륨 성분을 제외하고는 Mehlich Ⅲ법으로 추출되는 분석치가1MNH4OAc법으로 추출되는 것과 가장 상관이 높았다. 따라서 ICP를 이용하여 유효인산과 치환성 양이온의 분석은 다성분동시추출방법인 Mehlich Ⅲ법이 이용 가능할 것으로 판단되었다. Soil testing is one of the best management practices for sustainable agriculture. Recently, as increasing soil testing needs, simplification of soil analytical procedure has been required. To determine recommendable multi-element extractant, the soil testing results of available phosphate and exchangeable cations between the conventional method(Lancasterand1MNH4OAc) and multi-element extraction methods such as Mehlich Ⅲ, Modified Morgan and Kelowna methods were compared. There were highly significant correlation between the conventional methods and multi-element extraction methods (Mehlich Ⅲ, Modified Morgan and Kelowna) for available phosphate and exchangeable K, Ca, Mg and Na. The coefficients of determination (R<SUP>2</SUP>) between available phosphate extracted by Lancaster method and multielement extraction methods were in the order of MehlichⅢ (0.979<SUP>***</SUP>) > Kelowna (0.977<SUP>***</SUP>) > Modified(Mod.). Morgan (0.553<SUP>***</SUP>). For exchangeable cations, there were highly significant correlations between 1M NH4OAc method and Mehlich Ⅲ, Mod. Morgan and Kelowna. However, exchangeable K, Ca and Mg by Mehlich III method were more highly correlated with conventional method than other methods. Therefore, Mehlich III extraction method could be recommended as a single extractant for simultaneous measurement using ICP in the analysis of avaliable phosphate and exchangeable cations.
SWAT 모형과 BFlow를 이용한 지하수 함양, 기저유출의 시공간적 변화 분석
이지민 ( Ji Min Lee ),박윤식 ( Youn Shik Park ),정영훈 ( Young Hun Jung ),조재필 ( Jae Pil Cho ),양재의 ( Jae Eui Yang ),이관재 ( Gwan Jae Lee ),김기성 ( Ki Sung Kim ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.5
Occurrence frequency of flood and drought tends to increase in last a few decades, leading to social and economic damage since the abnormality of climate changes is one of the causes for hydrologic facilities by exceedance its designed tolerance. Soil and Water Assessment Tool (SWAT) model was used in the study to estimate temporal variance of groundwater recharge and baseflow. It was limited to consider recession curve coefficients in SWAT model calibration process, thus the recession curve coefficient was estimated by the Baseflow Filter Program (BFLOW) before SWAT model calibration. Precipitation data were estimated for 2014 to 2100 using three models which are GFDL-ESM2G, IPSL-CM5A-LR, and MIROC-ESM with Representative Concentration Pathways (RCP) scenario. SWAT model was calibrated for the Soyang watershed with NSE of 0.83, and R2 of 0.89. The percentage to precipitation of groundwater recharge and baseflow were 27.6% and 17.1% respectively in 2009. Streamflow, groundwater recharge, and baseflow were estimated to be increased with the estimated precipitation data. GFDL-ESM2g model provided the most large precipitation data in the 2025s, and IPSL-CM5A-LR provided the most large precipitation data in the 2055s and 2085s. Overall, groundwater recharge and baseflow displayed similar trend to the estimated precipitation data.