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Serrated flow accompanied with dynamic type transition of the Portevin-Le Chatelier effect in austenitic stainless steel

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Journal of Materials Science & Technology 2023年第2期133卷 154-164页

作者： Seung-Yong Lee Sita Chettri Ritupan Sarmah Chikako Takushima Jun-ichi Hamada nobuo nakada Department of Materials Science and Engineering Tokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohama-shiKanagawa-ken 226-8503Japan Department of Physics Tezpur UniversityNappamTezpur 784028India Research and Development Center Nippon Steel Stainless Steel CorporationHikari 743-8550Japan

In order to further understand high-temperature deformation behavior and its-related mechanical prop-erties,the Portevin-Le Chatelier(PLC)effect in an Fe-19Cr-13Ni-0.2C austenitic stainless steel was in-vestigated using high-temperature digital image correlation(DIC)*** the tensile testing at temperatures from 473 to 623 K,different types of serrated flow appeared even at a constant applied strain rate,and the type transition took place dynamically in a certain order with deformation *** analysis revealed that the dynamic type transition of the serrated flow obeys the PLC band propagation behavior,and that the transition of the PLC band propagation behavior could be attributed to the PLC band nucleation *** modeling also proved that the nucleation manner of PLC band nu-cleation is determined by the spatial-temporal coupling effect.

关键词： Dynamic strain aging(DSA) Austenitic stainless steel(γ-STS) Portevin-Le Chatelier(PLC)effect Digital image correlation(DIC) Local strain distribution

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Factors associated with complicated erosive esophagitis: A Japanese multicenter, prospective, cross-sectional study

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World Journal of Gastroenterology 2017年第2期23卷 318-327页

作者： Masahiro Sakaguchi Noriaki Manabe nobuo Ueki Jun Miwa Tomoki Inaba Norimasa Yoshida Kouichi Sakurai Masahiro Nakagawa Hajime Yamada Michiya Saito Koji nakada Katsuhiko Iwakiri Takashi Joh Ken Haruma Department of Gastroenterology Moriguchi Keijinkai Hospital Division of Endoscopy and Ultrasonography Department of Clinical Pathology and Laboratory MedicineKawasaki Medical School Department of Internal Gastroenterology and Hepatology Tokyo Rosai Hospital Department of Gastroenterology Toshiba General Hospital Department of Gastroenterology Kagawa Prefectural Central Hospital Department of Gastroenterology Japanese Red Cross Kyoto Daiichi Hospital Hattori Clinic Department of Endoscopy Hiroshima City Hospital Department of Gastroenterology and Hepatology Shinko Hospital1 Michiya Clinic1 Department of Laboratory Medicine Daisan Hospital Jikei University School of Medicine1 Department of Gastroenterology Nippon Medical School Graduate School of Medicine1 Department of Gastroenterology and Metabolism Nagoya City University Graduate School of Medical Sciences1 Department of General Internal Medicine 2 Kawasaki Medical School General Medical Center

AIM To assess the clinical characteristics of patients with complicated erosive esophagitis(EE) and their associated *** This prospective, cross-sectional study included patients diagnosed with EE by upper gastrointestinal endoscopy between October 2014 and March 2015 at 106 Japanese hospitals. Data on medical history, general condition, gastrointestinal symptoms, lifestyle habits, comorbidities, and endoscopic findings were collected using a standard form to create a dedicated database. Logistic regression analysis was used to calculate adjusted odds ratios(aO R) and 95%CI for the association with complicated *** During the study period, 1749 patients diagnosed with EE, 38.3% of whom were prescribed proton pump inhibitors(PPIs) were included. Of them, 143(8.2%) had EE complications. Esophageal bleeding occurred in 84(4.8%) patients, esophageal strictures in 45(2.6%) patients, and 14(0.8%) patients experienced both. Multivariate analysis showed that increased age(a OR: 1.05; 95%CI: 1.03-1.08), concomitant use of psychotropic agents(a OR: 6.51; 95%CI: 3.01-13.61), and Los Angeles grades B(a OR: 2.69; 95%CI: 1.48-4.96), C(aO R: 15.38; 95%CI: 8.62-28.37), and D(aO R: 71.49; 95%CI: 37.47-142.01) were significantly associated with complications, whereas alcohol consumption 2-4 d/wk was negatively associated(a OR: 0.23; 95%CI: 0.06-0.61). Analyzing associated factors with each EE complication separately showed esophageal ulcer bleeding were associated with increased age(a OR: 1.05; 95%CI: 1.02-1.07) and Los Angeles grades B(aO R: 3.60; 95%CI: 1.52-8.50), C(a OR: 27.61; 95%CI: 12.34-61.80), and D(a OR: 119.09; 95%CI: 51.15-277.29), while esophageal strictures were associated with increased age(a OR: 1.07; 95%CI: 1.04-1.10), gastroesophageal reflux symptom(aO R: 2.51; 95%CI: 1.39-4.51), concomitantuse of psychotropic agents(a OR: 11.79; 95%CI: 5.06-27.48), Los Angeles grades C(aO R: 7.35; 95%CI: 3.32-16.25), and D(a OR: 20.34; 95%CI: 8.36-49.53) and long-

关键词：复杂并发症腐蚀食道炎质子泵禁止者食道的溃疡流血食道的苛评

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