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고로슬래그 광촉매(TiO₂)담채를 이용한 시멘트몰탈의 질소산화물(NOx) 및 포름알데히드(HCHO)제거특성
이동범,김광련,김화중 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
That used photocatalyst carrier of blast-furnace slag powder and photocatalyst powder which was plastered from high temperature, this research investigated removal quality to NOx which become the cause of air pollution and HCHO which got out construction materials of a new building and tried to analyze the effect which photocatalyst carrier caused in the cement mortar, As a result of above, it will be raised the utility value of photocatalyst, it will be used the environment material.
탄탈륨 라이너의 폭발성형관통자 형성 시 형상 및 조직 변화 연구
박성택,김주영,김광련,강현수,오경원,박형기,송이화 대한금속·재료학회 2019 대한금속·재료학회지 Vol.57 No.8
An explosively formed penetrator (EFP) is a kind of kinetic energy warhead that contains a metal linear structure. After exploding, the linear structure in the EFP is deformed and hits the target as a form of aero-stable long-rod penetrator. To achieve high penetration performance, Ta is commonly used as the linear material due to its high density and formability. In this study, we investigated changes in the shape and microstructure of the Ta linear after explosion, especially for two cases; flying just before impact, and after impact. The computational simulation revealed that the disc shaped linear structure was elongated in the flying direction after the explosion, which was consistent with the results of the experiment. As the microstructure of the Ta linear could be changed during flight and after penetrating the target, samples of each stage were prepared. Microstructure analysis showed that severe deformation and dynamic recrystallization occurred repeatedly during flight after explosion, which seemed due to the increased temperature that results from the friction between the linear and air. After penetrating the target, the shape of the Ta linear was severely changed and grain size was drastically increased. At the moment when the EFP hit the target, the sharp increase in temperature would exert a critical impact on grain growth.