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Al 첨가가 $MgB_2$ 단결정의 비등방성에 미치는 영향에 대한 연구
강병원,이현숙,박민석,이성익,Kang, Byeong-Won,Lee, Hyun-Sook,Park, Min-Seok,Lee, Sung-Ik 한국초전도학회 2008 Progress in superconductivity Vol.9 No.2
We have studied superconducting properties of $Mg_{1-x}Al_xB_2$ single crystals from reversible magnetization measurements. It was found that the upper critical fields $H_{c2}$ were decreased for both H // c and H // ab as Al is substituted for Mg. As a result, the large anisotropy of $H_{c2}$ observed in pure $MgB_2$, which is considered as one of the characteristics of two-gap superconductor, was decreased with Al doping. On the other hand, the irreversibility fields $H_{irr}$ were increased for x = 0.1 and were significantly decreased for x = 0.2. In contrary to the anisotropy of $H_{c2}$, the anisotropy of $H_{irr}$ was increased as Al concentration increases.
Two-band effect in superconducting parameters and their anisotropies of $MgB_2$ single crystals
강병원,김헌정,이현숙,이성익,Kang, Byeong-Won,Kim, Heon-Jung,Lee, Hyun-Sook,Lee, Sung-Ik The Korean Superconductivity Society 2007 Progress in superconductivity Vol.8 No.2
We have studied superconducting parameters of $MgB_2$ single crystals from reversible magnetization measurements with the magnetic field both parallel and perpendicular to the c-axis of the crystals. The temperature dependence of the London penetration depth, ${\lambda}_{ab}{^{-2}}(T)$, obtained from the Hao-Clem analysis on reversible magnetization, shows a clear discrepancy from single-band theories. It is also found that the anisotropies of the London penetration depth, ${\gamma}_{\lambda}$, slowly increases with temperature while the anisotropy of the upper critical field, ${\gamma}_H$, decreases with temperature. These behaviors are in sharp contrast with the behavior of superconductors with a single band. The temperature dependence of ${\lambda}_{ab}{^{-2}}$, and the opposite temperature dependences of ${\gamma}_{\lambda}\;and\;{\gamma}_H$ can be well explained with the theory of the two-band superconductivity.
조지연 ( Jo Ji Yeon ),손상현 ( Son Sang Hyeon ),최한영 ( Choe Han Yeong ),이승진 ( Lee Seung Jin ),강병원 ( Kang Byeong Won ),심형진 ( Sim Hyeong Jin ),곽병국 ( Gwag Byeong Gug ),한상문 ( Han Sang Mun ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
본 연구를 통하여 키토산 제제들이 제산력을 가지고 있음을 확인할 수 있었고 Chitosan은 시판 제산제들의 1/3 정도만 제산력을 가지지만 대사성 알킬로시스나 부작용을 방지할 수 있으며 위 궤양이나 십이지장 궤양 환자들이 제산제를 장기 복용해야 한다는 특성을 생각하면 Chitosan 제산제는 장기간 복용하여 발생되는 부작용을 최소로 줄일 수 있을 것으로 사료된다. 또한 Chitosan은 코팅, 염증세포의 재생을 기대할수 있고. Chitosan의 기능을 부여한 제산제의 개발이 이뤄 질 수 있을 것으로 기대된다. In this study, antacid ability of chitosan was evaluated by ion exchange interaction of chitosan group. Although chitosan have an antacid effect of 30% as strong as commercial antacid agents, it prevents metabolic alcalosis and side effects, so chitosan are expected to minimize side effects from long-term application of patients with a gastric ulcer. In addition, chitosan is expected to be used in coation and restoration of inflammatory stomach cells, and chitosan antacid agents with proton binding on chitosan amino group will be developed in the future.