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拉丝机导轮材料激光强化后的摩擦磨损性能 被引量:1
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作者 朱维东 王义厢 +2 位作者 许继承 张文雄 杨吉强 《热加工工艺》 CSCD 北大核心 2008年第2期70-72,共3页
对拉丝机导轮材料QT500-7球墨铸铁激光强化后在屏显式摩擦磨损试验机上进行了摩擦磨损试验,并从激光强化后的组织变化分析了性能提高的原因。结果表明,表层微熔区形成的类白口组织对硬度及耐磨性贡献最大,热影响区形成了隐晶马氏体和残... 对拉丝机导轮材料QT500-7球墨铸铁激光强化后在屏显式摩擦磨损试验机上进行了摩擦磨损试验,并从激光强化后的组织变化分析了性能提高的原因。结果表明,表层微熔区形成的类白口组织对硬度及耐磨性贡献最大,热影响区形成了隐晶马氏体和残余奥氏体,石墨球周围出现的马氏体壳组织对提高耐磨性也有利。 展开更多
关键词 拉丝机导轮 QT500-7球墨铸铁 激光强化 类白口 摩擦磨损性能
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Natural orifice translumenal endoscopic surgery: Progress in humans since white paper 被引量:14
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作者 Byron F Santos Eric S Hungness 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第13期1655-1665,共11页
Since the first description of the concept of natural orifice translumenal endoscopic surgery (NOTES), a substantial number of clinical NOTES reports have appeared in the literature. This editorial reviews the availab... Since the first description of the concept of natural orifice translumenal endoscopic surgery (NOTES), a substantial number of clinical NOTES reports have appeared in the literature. This editorial reviews the available human data addressing research questions originally proposed by the white paper, including determining the optimal method of access for NOTES, developing safe methods of lumenal closure, suturing and anastomotic devices, advanced multitasking platforms, addressing the risk of infection, managing complications, addressing challenges with visualization, and training for NOTES procedures. An analysis of the literature reveals that so far transvaginal access and closure appear to be the most feasible techniques for NOTES, with a limited, but growing transgastric, transrectal, and transesophageal NOTES experience in humans. The theoretically increased risk of infection as a result of NOTES procedures has not been substantiated in transvaginal and transgastric procedures so far. Development of suturing and anastomotic devices and advanced platforms for NOTES has progressed slowly, with limited clinical data on their use so far. Data onthe optimal management and incidence of intraoperative complications remain sparse, although possible factors contributing to complications are discussed. Finally, this editorial discusses the likely direction of future NOTES development and its possible role in clinical practice. 展开更多
关键词 Natural orifice translumenal endoscopic surgery OUTCOMES COMPLICATIONS ENDOSCOPIC SURGERY
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