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BSCCO-2212/$SrSO_4$ 벌크 초전도체의 제작 및 특성평가
김규태,장석헌,박의철,황수민,주진호,홍계원,김찬중,김혜림,현옥배,Kim, Kyu-Tae,Jang, Seok-Hern,Park, Eui-Cheol,Hwang, Su-Min,Joo, Jin-Ho,Hong, Gye-Won,Kim, Chan-Joong,Kim, He-Lim,Hyun, Ok-Bae 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
We fabricated Bi-2212/$SrSO_4$ bulk superconductors by the casting process and evaluated the effects of the powder mixing method and annealing temperature on the texture, microstructure, and critical current. In the process, the Bi-2212 powders were mixed with $SrSO_4$ by hand-mixing(HM) and planetary ball milling(PBM) method and then the powder mixtures were melted at $1100^{\circ}C{\sim}1200^{\circ}C$, solidified, and annealed. We observed that the rod made by the PBM had a more homogeneous microstructure and smaller $SrSO_4$ and second phases than that of the rod made by the HM, resulting in increased $I_c$. The $I_c$ of the rod also depended on the annealing temperature and the highest $I_c$ was obtained to be 200 A when prepared by HM at $1200^{\circ}C$ and annealed at $810^{\circ}C$ which is probably due to the moderate density and 2212 texture and the smaller and less second phase compared to that at higher temperature. The possible causes of the variations of $I_c$ with the powder mixing method and annealing temperature were related to the microstructural evolution based on the SEM, EPMA, and DTA analyses.
한상환(Han Sang-Whan),황수민(Hwang Su-Min) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
It is challenging task to predict seismic demand for earthquake resistant design In current seismic design provisions, seismic demands are expressed as a design base shear of which the key components are linear elastic design response spectra, force reduction factor ('R factor'), and building weight In recent years, new methods for predicting seismic demands have been developed such as Capacity Spectrum Method (CSM) and Displacement Coefficient Method (DCM) In the CSM a performance point is used for representing seismic demands This study investigates the effect of different earthquake ground motion (EQGM) sets on seismic demands Key components of the base shear and performance points in the CSM are considered as the seismic demands to be tested. For this purpose three EQGM sets are considered that were collected at rock sites by Miranda(1993), Riddell(1995), and Seet et al(1976). This study found that seismic demands can vary significantly according to different EQGM sets even though those sets were obtained at sites with a similar soil condition This study also attempts to reduce the variability in the seismic demands with respect to different EQGM sets It is shown that the variability of seismic demands can reduced by using more refined classification criteria