光纤光栅传感器应用于道路工程最早可以追溯到21世纪初,目前作为一种常见的检测工具,光纤光栅应变传感器可以对道路结构的应变状况进行监测,凭借其灵敏度高、耐腐蚀、抗电磁干扰、使用寿命长等优点,在路面无损检测中发挥越来越重要的作...光纤光栅传感器应用于道路工程最早可以追溯到21世纪初,目前作为一种常见的检测工具,光纤光栅应变传感器可以对道路结构的应变状况进行监测,凭借其灵敏度高、耐腐蚀、抗电磁干扰、使用寿命长等优点,在路面无损检测中发挥越来越重要的作用。本文对目前光纤光栅传感器的安装工艺和检测参数的提取进行了整理和分析。通过前人的研究可以证明光纤光栅传感器在数据修正后,可以作为沥青路面应变真实值的检测工具。The application of fiber grating sensors in road engineering can be traced back to the beginning of the 21st century. At present, as a common detection tool, fiber grating strain sensors can monitor the strain condition of road structures. With its advantages of high sensitivity, corrosion resistance, anti-electromagnetic interference, and long service life, it plays an increasingly important role in the non-destructive testing of pavement. In this paper, the installation process and detection parameters of the current fiber grating sensor are sorted out and analyzed. Previous studies have proved that the fiber grating sensor can be used as a detection tool for the true value of asphalt pavement strain after data correction.展开更多
An intrinsic magnetic topological insulator(TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel ...An intrinsic magnetic topological insulator(TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi2Te4, by alternate growth of a Bi2Te3 quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.展开更多
Three-dimensional(3 D)topological insulators(TIs)are candidate materials for various electronic and spintronic devices due to their strong spin-orbit coupling and unique surface electronic structure.Rapid,low-cost pre...Three-dimensional(3 D)topological insulators(TIs)are candidate materials for various electronic and spintronic devices due to their strong spin-orbit coupling and unique surface electronic structure.Rapid,low-cost preparation of large-area TI thin films compatible with conventional semiconductor technology is the key to the practical applications of TIs.Here we show that wafer-sized Bi2Te3 family TI and magnetic TI films with decent quality and well-controlled composition and properties can be prepared on amorphous SiO2/Si substrates by magnetron cosputtering.The SiO2/Si substrates enable us to electrically tune(Bi1-xSbx)2Te3 and Cr-doped(Bi1-xSbx)2 Te3 TI films between p-type and n-type behavior and thus study the phenomena associated with topological surface states,such as the quantum anomalous Hall effect(QAHE).This work significantly facilitates the fabrication of TI-based devices for electronic and spintronic applications.展开更多
文摘光纤光栅传感器应用于道路工程最早可以追溯到21世纪初,目前作为一种常见的检测工具,光纤光栅应变传感器可以对道路结构的应变状况进行监测,凭借其灵敏度高、耐腐蚀、抗电磁干扰、使用寿命长等优点,在路面无损检测中发挥越来越重要的作用。本文对目前光纤光栅传感器的安装工艺和检测参数的提取进行了整理和分析。通过前人的研究可以证明光纤光栅传感器在数据修正后,可以作为沥青路面应变真实值的检测工具。The application of fiber grating sensors in road engineering can be traced back to the beginning of the 21st century. At present, as a common detection tool, fiber grating strain sensors can monitor the strain condition of road structures. With its advantages of high sensitivity, corrosion resistance, anti-electromagnetic interference, and long service life, it plays an increasingly important role in the non-destructive testing of pavement. In this paper, the installation process and detection parameters of the current fiber grating sensor are sorted out and analyzed. Previous studies have proved that the fiber grating sensor can be used as a detection tool for the true value of asphalt pavement strain after data correction.
基金Supported by the Ministry of Science and Technology of Chinathe National Science Foundation of Chinathe Beijing Advanced Innovation Center for Future Chip(ICFC)
文摘An intrinsic magnetic topological insulator(TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi2Te4, by alternate growth of a Bi2Te3 quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.
基金National Key R&D Plan Program of China(Grant No.2017YFF0206104)National Key Scien-tific Research Projects of China(Grant No.2015CB921502)+3 种基金National Natural Science Foundation of China(Grant Nos.61574169 and 51871018)Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,the Opening Project of Key Laboratory of Microelectronics Devices&Integrated Technology,Institute of Microelectronics of Chinese Academy of SciencesBeijing Natural Science Foundation(Grant No.Z180014)Beijing Outstanding Young Scientists Projects(Grant No.BJJWZYJH01201910005018)。
文摘Three-dimensional(3 D)topological insulators(TIs)are candidate materials for various electronic and spintronic devices due to their strong spin-orbit coupling and unique surface electronic structure.Rapid,low-cost preparation of large-area TI thin films compatible with conventional semiconductor technology is the key to the practical applications of TIs.Here we show that wafer-sized Bi2Te3 family TI and magnetic TI films with decent quality and well-controlled composition and properties can be prepared on amorphous SiO2/Si substrates by magnetron cosputtering.The SiO2/Si substrates enable us to electrically tune(Bi1-xSbx)2Te3 and Cr-doped(Bi1-xSbx)2 Te3 TI films between p-type and n-type behavior and thus study the phenomena associated with topological surface states,such as the quantum anomalous Hall effect(QAHE).This work significantly facilitates the fabrication of TI-based devices for electronic and spintronic applications.
