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주조 합금 Alloy 718에서 미세조직과 인장특성에 미치는 열처리의 영향
도정현 ( Jeong-hyeon Do ),김인수 ( In-soo Kim ),최백규 ( Baig-gyu Choi ),정중은 ( Joong-eun Jung ),정인용 ( In-yong Jung ),조창용 ( Chang-yong Jo ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.5
The effect of various types of heat-treatment on the mechanical properties of cast Alloy 718 has been investigated. Cast Alloy 718 bars were subjected to ‘standard heat-treatment`_(SHT), ‘HIP (Hot Isostatic Pressing) heat-treatment`_(HHT), and ‘HIP-sim-ulated heat-treatment`_(HS). In the absence of long time high temperature heat-treatment, a small amount of Laves phase remained in the ‘SHT` specimen, and needle shaped δ precipitated in the vicinity of the Laves phase. Due to the formation of the Laves and δ phases in the ‘SHT` specimen, it exhibited lower tensile properties than those of the others_specimens. On the other hand, the Laves phase was completely dissolved into the matrix after ‘HHT` and ‘HS` treatments. It is known that isostatic pressure reduces the self-diffusion coefficient, because of the lower self-diffusivity under HIP conditions in the interdendritic region, Nb segregation and the high amount of γ” precipitation that occurs. Due to the higher fraction of coarse γ” phases, the ‘HHT` treated Alloy 718 showed excellent tensile strength.
니켈기 초내열합금의 열간노출에 따른 미세조직 및 기계적 특성 변화
김인수 ( In-soo Kim ),최백규 ( Baig-gyu Choi ),정중은 ( Joong-eun Jung ),도정현 ( Jeong-hyeon Do ),정인용 ( In-yong Jung ),조창용 ( Chang-yong Jo ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.5
The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary γ` particles resolved after 2000 hour exposure at 816℃. At higher temperatures of 871℃ and 927℃, secondary γ` resolved after 1000 hours of exposure, and cuboidal primary γ` grew with exposure time. During the ther-mal exposure, σ phase formed at all tested temperatures, and η phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of γ` particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.
진단에서 38mg 저용량 요소(13C-urea) 캡슐을 이용한 요소호기검사의 유용성
전훈재 ( Jeon Hun Jae ),김용식 ( Kim Yong Sig ),진윤태 ( Jin Yun Tae ),김한겸 ( Kim Han Gyeom ),현진해 ( Hyeon Jin Hae ),정인식 ( Jeong In Sig ),최명규 ( Choe Myeong Gyu ),김상우 ( Kim Sang U ),이인석 ( Lee In Seog ),박경신 ( Park 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> Helicobacter pylori 감염의 비침습적 기준 진단법인 요소호기검사법(UBT)은 1987년 개발된 이후 진단기기의 개선과 요소용량, 검사시간, 시험식 등의 다양한 인자를 포함한 연구를 통해 진단의 정확도 및 편리성이 개선되어 왔다. 그러나 요소 75mg을 복용 후 30분에 호기를 채취하는 기존의 방법은 요소가 고가이며 검사 시간이 오래 걸리는 단점이 있다. 저자들은 최근 국내 바이오벤처인 ㈜메디켐스에서 개발, 상용화를 진행 중인, 요
살균제 Fludioxonil 및 Metconazole의 밀 부위별 잔류 양상
강자군 ( Ja-gun Kang ),황정인 ( Jeong-in Hwang ),이상협 ( Sang-hyeob Lee ),강민수 ( Min-su Kang ),정혜현 ( Hye-hyun Jung ),곽세연 ( Se-yeon Kwak ),류준상 ( Jun-sang Ryu ),홍성현 ( Seong-hyeon Hong ),박준홍 ( Jun-hong Park ),김장억 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
Residual patterns of fungicides fludioxonil and metconazole applied on wheat with their safe use guidelines were investigated with consideration for their distribution rates in each compartment of wheat. The fungicides were 2 or 3 times sprayed on wheats at the interval of 7 days prior to harvest. Wheat samples collected at final harvest day were divided into three compartments such as grain, hull and straw, and the pesticide residue analysis was individually carried out to such compartments of wheat. The analytical methods of fungicide residues in wheat were acceptable, with recoveries of 84.3 to 113.3% and correlation coefficients of 0.1 to 4.7%. Due to the systemic characteristics, the residual amounts of metconazole in the grain part of wheat were greater as 0.11~0.29 mg/kg than those amounts (0.02~0.07 mg/kg) for fludioxonil, and these residual amounts of both fungicides exceeded their maximum residue limits. According to absolute residue amounts of the fungicides in one wheat plant, their distribution rates in each compartment of wheat were the highest in straws (66.7~70.7%), followed by hulls (29.0~32.5%) and grains (0.2~0.9%). Although the distribution rates of fludioxonil and metconazole in wheat were the lowest in the edible grain parts, their high distribution rates in hulls and straws, available as feeds for livestock, may result in safety problems by pesticide residues. Therefore, it is required to assess the residual characteristics of pesticides in individual compartments of crops in order to ensure the safety for either foods to human or feeds to livestock from their residues.
토양에 잔류된 Endosulfan의 감자에 대한 흡수 및 잔류특성
곽세연 ( Se-yeon Kwak ),황정인 ( Jeong-in Hwang ),이상협 ( Sang-hyeob Lee ),류준상 ( Jun-sang Ryu ),홍성현 ( Seong-hyeon Hong ),강민수 ( Min-su Kang ),정혜현 ( Hye-hyun Jung ),강자군 ( Ja-gun Kangand ),김장억 ( Jang-eok Kim ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
There have been reports that an organochlorine insecticide endosulfan (ED) consisted of α- and β-isomers is consistently detected in Korean arable soils due to its long-term persistency, and a major metabolite ED-sulfate produced with its degradation is as toxic and persistent as the isomers. This study assessed the uptake amount of ED isomers and ED-sulfate by potato grown on ED-treated soils with concentrations of 2 and 10 mg/kg. Soil samples were collected at 0, 3, 7, 14, 21, 30, 60, and 90 d after planting of potato, and residual amounts of total ED calculated as a sum of isomers and metabolite were halved after 62.4 and 99.5 d in 2 and 10 mg/kg-treated soils, respectively. Potato plants sampled after growth of 60 to 90 d were divided into root, shoot and tuber parts. Most of ED isomers were present in root of potato with mean distribution rate of 57.1%, while ED-sulfate was the greatest in shoot part, with mean distribution rate of 64.5%. The uptake amounts of total ED in tuber of potato were the highest after 60 d of growth, showing concentrations of 0.49-2.34 mg/kg for both treatments. In addition, the distribution rate of ED isomers in potato tubers were 2 times higher than that of ED-sulfate. In Korea, there is no maximum residue limit (MRL) for ED in potato, while Codex and EU has such MRL as 0.05 mg/kg. At the final hervest day of 90 d, uptake amounts (0.2-1.3 mg/kg) of total ED in tuber of potato exceeded the MRL. Therefore, if the potato is cultivated in contaminated soils with concentrations of >2 mg/kg, its final products may be unsafe with exceeding MRL. The results in this study may provide the useful information to establish the management guideline of ED in soil for producing the safe agricultural products.