http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
방형파펄즈가열법에 의한 세라믹스의 열물성 측정에 관한 연구
차경옥,이경희,임굉,Cha, K.O.,Lee, K.H.,Yim, Going 한국결정성장학회 1999 韓國結晶成長學會誌 Vol.9 No.6
본 연구에서는 방형파 펄즈 가열법을 이용하여 세라믹 고유전체 열물성치의 측정에 활용하는 것에 대한 가능성을 검토하였다. 여기서 측정의 이론을 설정하고 측정의 자동화를 시도함으로써 매우 짧은 시간내 시료의 열확산계수, 비열 및 열전도율을 얻을 수 있었다. 또한 시료는 실온으로부터 약 1300 K 온도 범위까지 측정하였다. Thermophysical properties of the high-dielectric ceramics were measured by a single rectangular pulse heating method. The values of thermal diffusivities, specific heats, and thermal conductivities were measured as a function of temperature ranging from room temperature to 1300 K.
차경옥(K.O.Cha),김재근(J.G.Kim),유병구(B.G.Yu),양희준(H.J.Yong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The phenomena of drag reduction to decrease the friction in turbulent flow with small quantities of a linear macromolecules has attracted the attention of many experimental and theoretical investigations. On the other hand drag reduction in two phase flow can be applied to oil transport of crude oil. phase change system such as chemical reactor, pool and boiling flow. and to present cavitation which occurs pump impellers. But the research of drag reduction in two phase flow is not sufficient The purpose of the present work is to evaluate the drag reduction by measuring pressure drop. void fraction, mean liquid velocity and turbulent intensity whether polymer additives a horizontal two phase system or not. Flow pattern of air-water two phase flow was classified by electrical conductivity probe signal. Velocities and turbulent intensities of signal were measured simultaneously with a Hot-film Anemometer.<br/>
[論文] 方形波 펄스 加熱에 의한 BaOTiO₂,SrOTiO₂,MgOTiO₂系列의 熱物性値 測定에 관한 硏究
차경옥(K. O. Cha),장희석(H. S. Chang),이흥주(H. J. Lee) 한국자동차공학회 1991 오토저널 Vol.13 No.2
In this study, thermophysical properties of the ceramic dielectrics such as BaOTi0₂, SrOTi0₂, MgOTi0₂, were measured by a single rectangular pulse heating method.The values of thermal diffusivities, specific heats, and thermal conductivities were measured as a function of temperature range from room temperature to 1300k. The measured thermal properties of one group of ceramic material were compared with those of other group and discussed in detail in connection with the chemical composition. Thus, some criteria for thermal design with the electric-electronic ceramic material were proposed.