http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유동층 : P-267 ; 액체-고체 및 삼상 swirling 유동층의 상체류량 특성
유명선,신호진,손성모,강용,김상돈 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
액체-고체 및 삼상 Swirling 유동층 반응기는 열 및 물질전달 효과와 액체-고체상들 간의 접촉효율이 높기 때문에 촉매 반응기, 이온교환 수지를 이용한 특정 물질의 분리 및 회수, 흡착, 침강 및 폐수처리등에 공업적으로 널리 활용되고 있다. 본 연구에서는 직경이 0.102m이고, 높이가 2.0m인 액체-고체 및 삼상Swirling 유동층 관을 사용하였으며, 유동 고체 입자로는 밀도가 2500kg/m3인 유리구슬(dp= 1.7, 3, 6 mm)을 사용하였다. 액체-고체및 삼상 Swirling 유동층에서의 상체류량 특성을 고찰하기 위해 고체입자의 크기와 액체 유속, 기체 유속 그리고 액체의 Swirling 비 등을 사용하였다. 이 변수들이 고체입자의 상체류량에 미치는 영향과 기체가 있을 경우와 없을 경우 고체 입자의 상체류량에 미치는 영향을 검토하였다.
플라즈마 질화처리된 중탄소합금강의 내마모특성에 관한 연구
조효석,노용식,신호강,이상윤 ( H . S . Cho,Y . S . Roh,H . K . Shin,S . Y . Lee ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.4
This study has been performed to investigate into some effects of temperature, gas mixing ratio and time on the optical microstructure, hardness and wear characteristics of medium carbon alloy steel treated by plasma nitriding. The results obtained from the experiment are summarized as follows : (1) Optical micrographs of AISI 4140 steel plasma-nitrided by the double stage technique have revealed that the nitrided layer is composed of the compound layer and the diffusion layer. The variation in temperature at the first stage gives effects, on the formation of compound layer and the growth rate is shown to be relatively fast at 460℃. (2) The thickness of compound layer has been found to increase with increasing nitrogen percentage in the gas mixture and the holding time. It is therefore recommended that a shorter holding time and a lower nitrogen percentage are more effective to produce a tougher compound layer and a diffusion layer only. (3) X-ray diffraction analysis for AISI 4140 steel has shown that the compound layer consist of γ`-Fe₄N and α-Fe and that tough compound layer diffustion layer only can be obtained by the double stage plasmanitriding process. (4) There is also a tendency that the total hardened layer depth increases with increasing temperature, time and nitrogen percentage in the first stage during the double stage plasma nitriding. (5) The wear resistance of plasma nitrided specimens has been found thobe considerably increased compared to the untreated specimens and the amount of increment has appeared to increase further with increasing nitriding temperature, holding time and notrogen percentage of gas mixture in the first stage treatment.
Sursulf처리후 고주파 표면경화된 저탄소강의 경도 및 마모특성에 미치는 Sursulf처리시간 및 고주파 경화 이송속도의 영향
노용식,김영희,이평호,신호강,이상윤 ( Y . S . No,Y . H . Kim,P . H . Lee,H . K . Shin,S . Y. Lee ) 한국열처리공학회 1989 熱處理工學會誌 Vol.2 No.2
This study has been performed to investigate into some effects of the Sursulf treatment time and the traveling speed of surface hardening treatment on the hardness and the wear characteristics by applying the combined heat treating techniques of Sursulf process followed by induction hardening treatment to mild steel. It has been shown that increasing the Sursulf treatment time increases the case depth, but both hardness and wear resistance are not considerably improved. When the combined heat treating technique of high frequency induction heating after Sursulf treatment is applied, an improvement in case depth as well as wear resistance is obtained. In particular, the hardness in diffusion zone is greatly increased due mainly to the formation of martensite and possibly lower bainite. Iron oxides formed during induction heating and subsequent water spray cooling in the outermost part of compound layer may be considered to cause some increases in hardness and wear resistance.
장성강 ( Zhang Cheng-gang ),리신호 ( Rhee Shin-ho ),윤성수 ( Yoon Seong-soo ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
A heating greenhouse early in Joseon Dynasty was restored to the estimated state by the document "sangayorok(1940)" Diagrams of a restored greenhouse was reported. This heating greenhouse is eldest in the world. Growing vegetables in a restored greenhouse the inner temperature and humidity was investigated. This greenhouse was identified as making grow possible.
주호길 ( Joo Ho-gil ),리신호 ( Rhee Shin-ho ),김준봉 ( Kim Jun-bong ),장문기 ( Jang Mun-ki ),윤성수 ( Yoon Seong-soo ),장성강 ( Zhang Cheng-gang ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
A layout planning of the rural village must consider regional, environmental and historical background, at the view of future-oriental. The study is Ryongsan-chon, that common the Korean rural village in China. It has a good environment for agriculture but lacking facilities for life. The layout plans that consider the characteristic of in-China, and Korean made out.