针对6061-T6铝合金机器人搅拌摩擦焊(RFSW)展开研究,首先在库卡机器人的末端和搅拌摩擦焊电主轴之间安装六维力传感器,搭建六维力传感器数据采集系统。其次采用不同的工艺参数对5 mm 6061-T6铝合金进行焊接,在焊接过程中实时监测搅拌头...针对6061-T6铝合金机器人搅拌摩擦焊(RFSW)展开研究,首先在库卡机器人的末端和搅拌摩擦焊电主轴之间安装六维力传感器,搭建六维力传感器数据采集系统。其次采用不同的工艺参数对5 mm 6061-T6铝合金进行焊接,在焊接过程中实时监测搅拌头受到的轴向力和前进抗力,焊后对焊缝横截面进行观察与分析,对焊缝横截面进行拉伸测试和硬度测量,分析轴向力和前进抗力对焊缝微观组织及力学性能的影响。结果表明:搅拌头转速在800~3400 r/min之间,搅拌头转速对焊缝力学性能影响较小;焊接速度在60~360 mm/min之间,焊缝力学性能良好。焊接过程中搅拌针下压阶段轴向力最大,达到约5000 N,焊接阶段稳定时,轴向力约为3600 N,焊接阶段前进抗力最大,达到约−550 N。在焊接过程中,轴向力/前进抗力的比值为−6.5左右时焊缝性能良好。展开更多
We propose an ultracompact channel drop filter(CDF)based on photonic crystal nanobeam cavities.The conditions for implementing such an ideal CDF are derived from the temporal coupled-mode equations governing the opera...We propose an ultracompact channel drop filter(CDF)based on photonic crystal nanobeam cavities.The conditions for implementing such an ideal CDF are derived from the temporal coupled-mode equations governing the operation of the CDF.By considering the intercoupling of the two involved nanobeam cavities,some ambiguities of the previous equivalent circuit model analysis are cleared up.Practical configurations on silicon-on-insulator(SOI)for the proposed CDF are suggested with a typical length less than 15μm.Finite difference time domain(FDTD)method calculations show that the proposed filter can achieve drop efficiency higher than 99%without any reflection.Compared to theλ/4-shifted Bragg grating resonators based CDF,the proposed CDF is more compact,high-efficient and reflection-free.It is also easy to implement a low-power tunable filter due to the ultrahigh quality factor Q and ultrasmall modal volume V of the involved photonic crystal nanobeam cavities.展开更多
肝门部胆管癌(hilar cholangiocarcinoma,HC)分型和分期系统较为庞杂,包括改良Bismuth-Corlette分型,Gazzaniga T分期,Blumgart T分期,美国纪念Sloan-Kattering癌症中心(Memorial Sloan Katering Cancer Center,MSKCC)T分期,Mayo分期系...肝门部胆管癌(hilar cholangiocarcinoma,HC)分型和分期系统较为庞杂,包括改良Bismuth-Corlette分型,Gazzaniga T分期,Blumgart T分期,美国纪念Sloan-Kattering癌症中心(Memorial Sloan Katering Cancer Center,MSKCC)T分期,Mayo分期系统,美国癌症联合委员会(American Joint Committee on Cancer,AJCC)和国际抗癌联盟(International Union Against Cancer,UICC)联合发布的TNM分期,欧洲肝胆胰协会分期(Consensus classification from the European Hepato-Pancreato-Biliary Association,EHPBA),以及日本肝胆胰外科学会(Japanese Society of Hepato-Biliary-Pancreatic Surgery,JSHBPS)分期,各分期系统所包含的内容差异较大,各具特色和优缺点,本文就HC常见的分型和分期系统及其在临床中的应用价值做一综述。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 60977043,61228501the National Basic Research Program of China under Grant No 2012AA012203,and Tang Zhongyin Fund of ZJU.
文摘We propose an ultracompact channel drop filter(CDF)based on photonic crystal nanobeam cavities.The conditions for implementing such an ideal CDF are derived from the temporal coupled-mode equations governing the operation of the CDF.By considering the intercoupling of the two involved nanobeam cavities,some ambiguities of the previous equivalent circuit model analysis are cleared up.Practical configurations on silicon-on-insulator(SOI)for the proposed CDF are suggested with a typical length less than 15μm.Finite difference time domain(FDTD)method calculations show that the proposed filter can achieve drop efficiency higher than 99%without any reflection.Compared to theλ/4-shifted Bragg grating resonators based CDF,the proposed CDF is more compact,high-efficient and reflection-free.It is also easy to implement a low-power tunable filter due to the ultrahigh quality factor Q and ultrasmall modal volume V of the involved photonic crystal nanobeam cavities.
文摘肝门部胆管癌(hilar cholangiocarcinoma,HC)分型和分期系统较为庞杂,包括改良Bismuth-Corlette分型,Gazzaniga T分期,Blumgart T分期,美国纪念Sloan-Kattering癌症中心(Memorial Sloan Katering Cancer Center,MSKCC)T分期,Mayo分期系统,美国癌症联合委员会(American Joint Committee on Cancer,AJCC)和国际抗癌联盟(International Union Against Cancer,UICC)联合发布的TNM分期,欧洲肝胆胰协会分期(Consensus classification from the European Hepato-Pancreato-Biliary Association,EHPBA),以及日本肝胆胰外科学会(Japanese Society of Hepato-Biliary-Pancreatic Surgery,JSHBPS)分期,各分期系统所包含的内容差异较大,各具特色和优缺点,本文就HC常见的分型和分期系统及其在临床中的应用价值做一综述。
