Optical reflection anisotropy microscopy mappings of micropipe defects on the surface of a 4H-SiC single crystal are studied by the scanning anisotropy microscopy(SAM)system.The reflection anisotropy(RA)image with a&#...Optical reflection anisotropy microscopy mappings of micropipe defects on the surface of a 4H-SiC single crystal are studied by the scanning anisotropy microscopy(SAM)system.The reflection anisotropy(RA)image with a'butterfly pattern'is obtained around the micropipes by SAM.The RA image of the edge dislocations is theoretically simulated based on dislocation theory and the photoelastic principle.By comparing with the Raman spectrum,it is verified that the micropipes consist of edge dislocations.The different patterns of the RA images are due to the different orientations of the Burgers vectors.Besides,the strain distribution of the micropipes is also deduced.One can identify the dislocation type,the direction of the Burgers vector and the optical anisotropy from the RA image by using SAM.Therefore,SAM is an ideal tool to measure the optical anisotropy induced by the strain field around a defect.展开更多
目的探讨三维重建指导下腹腔镜右半肝加尾状叶切除治疗Bismuth Ⅲa型肝门部胆管癌(HCCA)的临床效果。方法回顾性分析2018年1月至2020年12月62例Bismuth Ⅲa型HCCA患者临床资料,按术前是否采用三维重建将患者分为对照组(行腹腔镜右半肝...目的探讨三维重建指导下腹腔镜右半肝加尾状叶切除治疗Bismuth Ⅲa型肝门部胆管癌(HCCA)的临床效果。方法回顾性分析2018年1月至2020年12月62例Bismuth Ⅲa型HCCA患者临床资料,按术前是否采用三维重建将患者分为对照组(行腹腔镜右半肝加肝尾状叶切除术)和研究组(三维重建指导下行腹腔镜右半肝加肝尾状叶切除术),每组各31例。数据应用软件SPSS 22.0处理。围手术期相关指标、肝功能指标等计量资料采用(x±s)表示,组间比较行独立样本t检验,组内比较行配对t检验;术后并发症等计数资料行χ^(2)检验。生存分析采用Kaplan-Meier法并行Log-Rank检验。P<0.05为差异有统计学意义。结果研究组患者手术时间、术中出血量、术后拔管时间、肛门排气时间及术后住院时间均显著低于对照组(P<0.05);两组患者肝脏切除体积比较差异无统计学意义(P>0.05)。术后两组患者TBIL、AST及ALT水平较术前均显著升高(P<0.05),且研究组上述各项指标均显著低于对照组(P<0.05)。研究组患者术后并发症的总发生率较对照组显著降低(16.1% vs. 38.7%,P<0.05)。随访期间,通过Kaplan-Meier分析显示,两组累积总生存率(71.0% vs. 80.6%)及无病生存率(67.7% vs. 77.4%)比较,差异均无统计学意义(Log-Rank χ^(2)=2.042、1.435,P=0.153、0.231)。结论三维重建指导下腹腔镜右半肝加尾状叶切除治疗Bismuth Ⅲa型HCCA不仅能够缩短手术时间,减少术中损伤,加快术后恢复,而且还对肝功能具有一定的保护作用,并可有效降低术后并发症的发生,确保了手术的精准性和安全性。展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2018YFE0204001,2018YFA0209103,2016YFB0400101,and 2016YFB0402303)the National Natural Science Foundation of China(Grant Nos.61627822,61704121,61991430,and 62074036)Postdoctoral Research Program of Jiangsu Province(Grant No.2021K599C).
文摘Optical reflection anisotropy microscopy mappings of micropipe defects on the surface of a 4H-SiC single crystal are studied by the scanning anisotropy microscopy(SAM)system.The reflection anisotropy(RA)image with a'butterfly pattern'is obtained around the micropipes by SAM.The RA image of the edge dislocations is theoretically simulated based on dislocation theory and the photoelastic principle.By comparing with the Raman spectrum,it is verified that the micropipes consist of edge dislocations.The different patterns of the RA images are due to the different orientations of the Burgers vectors.Besides,the strain distribution of the micropipes is also deduced.One can identify the dislocation type,the direction of the Burgers vector and the optical anisotropy from the RA image by using SAM.Therefore,SAM is an ideal tool to measure the optical anisotropy induced by the strain field around a defect.
文摘目的探讨三维重建指导下腹腔镜右半肝加尾状叶切除治疗Bismuth Ⅲa型肝门部胆管癌(HCCA)的临床效果。方法回顾性分析2018年1月至2020年12月62例Bismuth Ⅲa型HCCA患者临床资料,按术前是否采用三维重建将患者分为对照组(行腹腔镜右半肝加肝尾状叶切除术)和研究组(三维重建指导下行腹腔镜右半肝加肝尾状叶切除术),每组各31例。数据应用软件SPSS 22.0处理。围手术期相关指标、肝功能指标等计量资料采用(x±s)表示,组间比较行独立样本t检验,组内比较行配对t检验;术后并发症等计数资料行χ^(2)检验。生存分析采用Kaplan-Meier法并行Log-Rank检验。P<0.05为差异有统计学意义。结果研究组患者手术时间、术中出血量、术后拔管时间、肛门排气时间及术后住院时间均显著低于对照组(P<0.05);两组患者肝脏切除体积比较差异无统计学意义(P>0.05)。术后两组患者TBIL、AST及ALT水平较术前均显著升高(P<0.05),且研究组上述各项指标均显著低于对照组(P<0.05)。研究组患者术后并发症的总发生率较对照组显著降低(16.1% vs. 38.7%,P<0.05)。随访期间,通过Kaplan-Meier分析显示,两组累积总生存率(71.0% vs. 80.6%)及无病生存率(67.7% vs. 77.4%)比较,差异均无统计学意义(Log-Rank χ^(2)=2.042、1.435,P=0.153、0.231)。结论三维重建指导下腹腔镜右半肝加尾状叶切除治疗Bismuth Ⅲa型HCCA不仅能够缩短手术时间,减少术中损伤,加快术后恢复,而且还对肝功能具有一定的保护作用,并可有效降低术后并发症的发生,确保了手术的精准性和安全性。
