The ever-increasing integration of electronic devices has inevit-ably caused electromagnetic interference and heat accumulation problems,and dual-function materials with both a high thermal conductivity and high elect...The ever-increasing integration of electronic devices has inevit-ably caused electromagnetic interference and heat accumulation problems,and dual-function materials with both a high thermal conductivity and high electromagnetic wave absorption(EWA)are regarded as an effective strategy for solving these problems.Carbon materials are widely used as thermal and EWA fillers due to their excellent conductivity and outstanding thermal conduction properties,and have become a research hotspot in the field of high thermal conductivity,microwave absorbing materials in recent years.The status of current research progress on carbon-based high thermal-conduction microwave absorption materials,including carbon fibers,carbon nanotubes,graphene and amorphous carbon,is re-viewed,and the influence of the structure of the materials on their absorption and thermal conductivity properties,such as core-shell structure,three-dimensional network structure,and heteroatom doping,is also elaborated.Feasible solutions for the cur-rent problems with these materials are proposed,with the aim of providing valuable guidance for the future design of carbon-based high thermal conduction microwave absorbing materials.展开更多
文摘为了提高光笔式便携三维坐标视觉测量系统的稳定性,根据系统的测量原理和成像机理,在CCD摄像机像平面内对光笔上被测控制点的实际像点坐标进行平面直线最小二乘拟合,得到修正后的实际像点坐标;对计算出的被测控制点坐标在摄像机坐标系中进行空间直线的最小二乘拟合,得到修正后的被测控制点坐标,推导出了平面和空间直线的最小二乘拟合和数据修正公式.实验结果表明,经过上述数据处理后,被测点坐标的测量稳定性在Z,Y,X方向上可分别提高0.644mm,0.04 mm,0.002 mm.
基金financial supports from the National Natural Science Foundation of China(22238012 and 22178384)Science Foundation of China University of Petroleum,Beijing(2462024QNXZ003)。
文摘The ever-increasing integration of electronic devices has inevit-ably caused electromagnetic interference and heat accumulation problems,and dual-function materials with both a high thermal conductivity and high electromagnetic wave absorption(EWA)are regarded as an effective strategy for solving these problems.Carbon materials are widely used as thermal and EWA fillers due to their excellent conductivity and outstanding thermal conduction properties,and have become a research hotspot in the field of high thermal conductivity,microwave absorbing materials in recent years.The status of current research progress on carbon-based high thermal-conduction microwave absorption materials,including carbon fibers,carbon nanotubes,graphene and amorphous carbon,is re-viewed,and the influence of the structure of the materials on their absorption and thermal conductivity properties,such as core-shell structure,three-dimensional network structure,and heteroatom doping,is also elaborated.Feasible solutions for the cur-rent problems with these materials are proposed,with the aim of providing valuable guidance for the future design of carbon-based high thermal conduction microwave absorbing materials.
