http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
CFD 시뮬레이션을 이용한 액화수소 저장용기 copper conductive shield에 관한 연구
문성식(Seong-sik Moon),한상태(Sang Tae Han),장진혁(Jang Jin Hyuk),리광훈(Gwang Hoon Rhee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Cryogenic Liquid hydrogen evaporates at room temperature. Insulation performance is important to increase the efficiency of storing liquid hydrogen. One of the factors affecting the storage vessel performance is Vapor cooled shied(VCS). In this study, We study the role of Copper conductive shield(CCS) to replace VCS. It is calculated by numerical method with commercial CFD code Star-ccm+. The heat of penetration into the inner vessel is calculated by changing the position of the copper inside the Multi-layer insulation(MLI) of the liquid hydrogen storage. It is found that there is an optimum location of copper to minimize the penetration heat. CCS transfers heat to the neck of the tank.
문성식,김병수,강정수 대한동의생리학회,대한동의병리학회 2003 동의생리병리학회지 Vol.17 No.2
In order to examine the antioxidant actions of YMJHT, the study was done through measurement of parameters such as LPO(lipidperoxidation), GSH(glutathione), SOD(superoxidation dismutase), catalase, GOT, GPT, ALP, the results were obtained as follows: For the weight changes, in the testis the group given YMJHT showed significant increase compared to the control group. In the left cerebrum, the group given YMJHT showed significant increase compared to the control group on the activities of SOD, catalase. In the right cerebrum, the group given YMJHT showed significant decrease on the content of LPO and showed significant increase on the activity of catalase. In the cerebellum, the group given YMJHT showed significant decrease on the content of LPO and showed significant increase on the activities of SOD, catalase. In the liver, the group given YMJHT showed significant decrease on the content of GSH and showed significant increase on the activity of SOD. In the kidney, the group given YMJHT showed significant decrease on the contents of GSH, GSH and showed significant increase on the activities of SOD, catalase. In the testis, the group given YMJHT showed significant decrease on the contents of LPO, GSH and showed significant increase on the activity of SOD. From above results, the antioxidant action of YMJHT is effective. And it is expected to be necessary to the study of the mechanism in the antioxidant of YMJHT.
수소기체에 함유된 O2 CO 및 탄화수소 기체에 의한 LaNi5 의 불활성화 및 재생
이화영,남기석,문성식 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
수소기체에 함유된 O₂, CO 및 탄화수소기체에 의한 LaNi_5의 불활성화와 활성이 저하된 LaNi_5의 재생성을 연구하였다. 순수한 NaNi_5와 마이크로캡슐화된 LaNi_5의 압력-농도-온도 곡선은 거의 같음을 보였다. 혼합기체에서 마이크로캡슐화된 LaNi_5의 수소화반응속도는 순수한 LaNi_5의 속도보다 높았다. 산소를 함유한 수소기체에서는 시료의 종류와는 상관없이 반응cycle에 따라 LaNi_5의 반응분율이 거의 100%로 일정히 유지되었다. 일산화탄소를 함유한 수소기체에서는 시료의 종류에 따라 다르기는 하나 반응 cycle이 증가함에 따라 LaNi_5의 반응분율이 감소하였다. 활성이 저하된 NaNi_5는 423 K에서 CO와 수소가 반응하여 CH₄가 생성되어 재생되었으며, 재생된 LaNi_5는 90% 이상의 높은 반응분율을 보였다. The deactivation of LaNi_5 by O₂, CO and hydrocarbon gases contained in hydrogen gas, and the regeneration of the deactivated LaNi_5 were studied. The pressure-concentration-temperature curves for pure and microencapsulated LaNi_5 were shown to be almost the same. In the mixed gases, the hydrogenating reaction rates of microencapsulated LaNi_5 were higher than of pure LaNi_5. Independent of the samples, in the hydrogen gas containing oxygen, the reacted fraction of LaNi_5 maintained constant at nearly 100%. In the hydrogen gas containing carbon monoxide, on the contrary, the reacted fractions decreased with the increase of the reaction cycle although the magnitudes of them were slightly different according to the samples. The deactivated LaNi_5 was regenerated by the formation of CH₄ from the reaction of CO and H₂ at 423 K, and the regenerated LaNi_5 showed a fraction higher than 90%.