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利用微计算机断层扫描定量研究选择性激光熔化Ti6Al4V合金缺陷的几何特征及形成机理
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作者 安娜莹 帅三三 +3 位作者 陈超越 雷力明 王江 任忠鸣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2023年第10期2986-3002,共17页
增材制造(AM)部件内部形成的缺陷对打印零件的力学性能具有不利影响。缺陷对零件性能的影响因其几何特征的不同而不同。利用X射线计算机层析成像(XCT)研究不同打印参数下36个块状Ti6Al4V样品的孔隙缺陷特征。根据样品中孔隙的几何特征,... 增材制造(AM)部件内部形成的缺陷对打印零件的力学性能具有不利影响。缺陷对零件性能的影响因其几何特征的不同而不同。利用X射线计算机层析成像(XCT)研究不同打印参数下36个块状Ti6Al4V样品的孔隙缺陷特征。根据样品中孔隙的几何特征,将孔隙缺陷分为4种类型:球形、椭圆形、长条形和不规则形。在所有工艺参数下,长条形状缺陷所占比例最大,并且随着扫描速度的提高,不规则形状缺陷所占比例逐渐增大。另外,分析单道和多道试样中缺陷逐渐积累规律。随着层的叠加,孔隙逐渐积累,而适当的搭接率可能会熔化道之间的气孔。表面粗糙度和熔池润湿对缺陷的形成有很大的影响。 展开更多
关键词 选择性激光熔化 X射线计算机断层扫描 气孔缺陷 3D几何形态 形成机制 TI6AL4V合金
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Risk factor analysis of perioperative mortality after ruptured bleeding in hepatocellular carcinoma 被引量:11
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作者 Hao-Ming Lin li-ming lei +2 位作者 Jie Zhu Guo-Lin Li Jun Min 《World Journal of Gastroenterology》 SCIE CAS 2014年第40期14921-14926,共6页
AIM:To discuss strategies and prognosis for the emergency treatment of ruptured bleeding in primary hepatocellular carcinoma.METHODS:The retrospective analysis was performed by examining the emergency treatment experi... AIM:To discuss strategies and prognosis for the emergency treatment of ruptured bleeding in primary hepatocellular carcinoma.METHODS:The retrospective analysis was performed by examining the emergency treatment experiences of60 cases of ruptured bleeding in primary hepatocellular carcinoma.The treatment methods included surgical tumour resection,transcatheter arterial embolization(TAE)and non-surgical treatment.Univariate and multivariate analyses were performed to identify the risk factors that impacted 30-d mortality in the research groups.RESULTS:The 30-d mortality of all patients was 28.3%(n=17).The univariate analysis showed that ChildPugh C level liver function,shock,massive blood transfusion and large tumour volume were risk factors thatinfluenced 30-d mortality.The multivariate analysis showed that shock and massive blood transfusion were independent risk factors that impacted the 30-d mortality of surgical resection.As for the TAE patients,larger tumour volume was a risk factor towards prognosis.CONCLUSION:Radical resection and TAE therapy would achieve better results in carefully selected ruptured hepatocellular tumours. 展开更多
关键词 HEPATOCELLULAR CARCINOMA SPONTANEOUS RUPTURE Liver
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