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An upgrade recycling from Mg alloy chips toward superconducting MgB2 via powder processing
Makoto Nanko,Daisuke Maruoka,Hitoshi Ozawa,Shigeharu Kamado,Hiroya Abe,Akira Kondo,Makio Naito 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature. A recycling process of Mg alloy chips to obtain superconducting MgB2 is proposed. In the present process, mechanical milling was used to mix and grind AZ31 chips and boron powder. Fine AZ31/boron powder mixture can be fabricated via a mechanical milling process. Mechanical milling can reduce the process time to synthesize MgB2 powder. An AZ31/boron mixture via mechanical milling can be reacted completely to MgB2 by heating at 700℃ for 3 h. Sintered MgB2 bodies produced by a pulsed electric current sintering technique showed approximately 30 K as the superconducting critical temperature.
( Kenichiro Okimoto ),( Makoto Arai ),( Hideaki Ishigami ),( Keiko Saito ),( Shoko Minemura ),( Daisuke Maruoka ),( Tomoaki Matsumura ),( Tomoo Nakagawa ),( Tatsuro Katsuno ),( Masaki Suzuki ),( Yukio 대한간학회 2018 Gut and Liver Vol.12 No.1
Background/Aims: Eosinophilic esophagitis (EoE) is often erroneously diagnosed as gastroesophageal reflux disease (GERD). The aim of this study is to investigate the prevalence of EoE and the expression of tight junction (TJ) proteins in patients with GERD symptoms. Methods: One hundred patients with GERD symptoms and 10 healthy controls were prospectively studied. Sixty-two patients had symptoms refractory to proton pump inhibitors (PPI). All patients underwent esophageal biopsy. Patients were diagnosed with EoE if the number of eosinophil granulocytes per high-power field was ≥15. Immunohistochemical analysis of TJ proteins (claudin-1, claudin-4, occludin, and zonula occludin-1 [ZO-1]) was performed. Results: EoE was diagnosed in six of 100 patients (6%) with GERD symptoms and in six patients (9.7%) of 62 patients with PPI-refractory GERD. Only one had typical EoE endoscopic findings. The proportion of ZO-1-positive cells was significantly lower in the lower than in the middle esophagus (56.0%±14.0% vs 66.0%±11.5%, p<0.05). There were no significant correlations between TJ protein expression and GERD symptoms. Conclusions: The prevalence of EoE among patients with PPI-refractory GERD is approximately 10%. Regardless of endoscopic findings, esophageal biopsy is crucial in diagnosing EoE. The disruption of ZO-1 expression in the lower esophagus is significantly associated with GERD symptoms. (Gut Liver 2018;12:30-37)