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您的检索式：作者名="GUI Xinyuan"
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| 1 | Real-Time Position and Attitude Estimation for Homing and Docking of an Autonomous Underwater Vehicle Based on Bionic Polarized Optical Guidance显示文摘As an important tool for marine exploration, the autonomous underwater vehicle(AUV) must home in and dock at a docking station(DS) to be recharged, repaired, or to exchange information at set intervals. However, the complex and hostile underwater environment makes this process challenging. This study proposes a real-time method based on polarized optical guidance for determining the position and attitude of the AUV relative to its DS. Four polarized artificial underwater landmarks are positioned at the DS, which are recognized by the AUV vision system. Compared with light intensity, the polarization of a light beam is known to be better maintained at greater propagation distances, especially in underwater environments. The proposed method, which is inspired by the ability of marine animals to communicate, calculates the pose parameters in less than 10 ms without any other navigational information. The simulation results reveal that the angle errors are small and the position errors are no more than 0.116 m within 100 m in the coastal ocean. The results of underwater experiments further demonstrate the feasibility of the proposed method, which extends the operating distance of the AUV beyond what is currently possible while maintaining the precision of traditional optical guidance. | CHENG Haoyuan CHU Jinkui ZHANG Ran GUI Xinyuan TIAN Lianbiao | 2020 | Journal of Ocean University of China2020，19，5： | 6 |
| 2 | Temperature dependent conductivity of Bi_4Ti_3O_(12) ceramics induced by Sr dopants显示文摘Bi_4Ti_3O_(12) is an important lead-free ferroelectric material.Doping modification of Bi_4Ti_3O_(12)has attracted great attention to improving its performances.In this work,the effect of Sr dopants on the microstructure,dielectric,and conductivity of Bi_4Ti_3O_(12) ceramic was investigated by XRD,SEM,and AC impedance spectroscopy.Substitution of 1 at%Sr for Bi decreased the grain size,suppressed the dielectric dispersion of Bi_4Ti_3O_(12) ceramic at room temperature,and resulted in different effects on the conductivity of grains and grain boundaries.The conductivity of grains in Bi_4Ti_3O_(12) ceramic was increased by the small amount of Sr dopants in the whole experimental temperature range.While the grain boundaries of 1 at%Sr-doped Bi_4Ti_3O_(12) exhibited lower conductivity than pure Bi_4Ti_3O_(12) below~380℃and higher conductivity above~380℃.The experimental phenomena were interpreted in term of compensating defects for Sr dopants. | Lin WANG Mengqi GUI Hai-Bo JIN Xinyuan HU Yongjie ZHAO Naseer Muhammad ADNAN Jing-Bo LI | 2018 | Journal of Advanced Ceramics2018，7，3： | 3 |
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