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Photoinduced Effect in Li-doped ZnO studied by Raman Scattering
Daisuke Kagami,Masaki Takesada,Akira Onodera,Hiroyasu Satoh 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Optical phonon behavior and photoexcited effect in Li-doped ZnO ceramics were investigated at around the ferroelectric phase transition point Tc = 366 K by Raman scattering using a double monochromator. The temperature dependence of Raman scattering spectra was obtained from 300 K to 500 K through Tc. The A1 and E2 modes did not show any anomaly at around Tc accompanied to the ferroelectric phase transition. The result indicates that the mechanism of the ferroelectric phase transition does not originate in an order-disorder type with the size mismatch of doped Li and Zn cations, but in the electronic ferroelectric phase transition with a change of electronic state. The photoinduced effect was observed in the A1 mode with ferroelectric polarization at around Tc under ultraviolet (UV) excitation with energies higher than the band gap energy.
( Kazumichi Kawakubo ),( Hiroshi Kawakami ),( Masaki Kuwatani ),( Shin Haba ),( Taiki Kudo ),( Yoko Abe ),( Shuhei Kawahata ),( Manabu Onodera ),( Nobuyuki Ehira ),( Hiroaki Yamato ),( Kazunori Eto ) 대한소화기학회 2014 Gut and Liver Vol.8 No.3
Endoscopic ultrasound (EUS) and endoscopic retrograde cholangiopancreatography (ERCP) are essential for diagnosing and treating pancreatobiliary diseases. Single-session EUS and ERCP are considered to be essential in reducing the duration of hospital stays; however, complications are a primary concern. The aim of this study was to evaluate the safety and efficacy of single-session EUS and ERCP. Sixty-eight patients underwent single-session EUS and ERCP at a tertiary referral center between June 2008 and December 2012. We retrospectively reviewed patient data from a prospectively maintained EUS-ERCP database and evaluated the procedural characteristics and complications. Thirty-eight patients (56%) underwent diagnostic EUS, and 30 patients (44%) underwent EUS fine-needle aspiration, which had an overall accuracy of 100%. Sixty patients (89%) underwent therapeutic ERCP, whereas the remaining eight procedures were diagnostic. Thirteen patients underwent biliary stone extraction, and 48 underwent biliary drainage. The median total procedural time was 75 minutes. Complications were observed in seven patients (10%). Six complications were post-ERCP pancreatitis, which were resolved using conservative management. One patient developed Mallory-Weiss syndrome, which required endoscopic hemostasis. No sedation-related cardiopulmonary complications were observed. Single-session EUS and ERCP provided accurate diagnosis and effective management with a minimal complication rate.