Wireless information and power transfer(WIPT) enables simultaneously communications and sustainable power supplement without the erection of power supply lines and the replacement operation of the batteries for the te...Wireless information and power transfer(WIPT) enables simultaneously communications and sustainable power supplement without the erection of power supply lines and the replacement operation of the batteries for the terminals. The application of WIPT to the underwater acoustic sensor networks(UWASNs) not only retains the long range communication capabilities, but also provides an auxiliary and convenient energy supplement way for the terminal sensors, and thus is a promising scheme to solve the energy-limited problem for the UWASNs. In this paper, we propose the integration of WIPT into the UWASNs and provide an overview on various enabling techniques for the WIPT based UWASNs(WIPT-UWASNs) as well as pointing out future research challenges and opportunities for WIPT-UWASNs.展开更多
In planning and executing marine controlled-source electromagnetic methods, seafloor electromagnetic receivers must overcome the problems of noise, clock drift, and power consumption. To design a receiver that perform...In planning and executing marine controlled-source electromagnetic methods, seafloor electromagnetic receivers must overcome the problems of noise, clock drift, and power consumption. To design a receiver that performs well and overcomes the abovementioned problems, we performed forward modeling of the E-field abnormal response and established the receiver＇s characteristics. We describe the design optimization and the properties of each component, that is, low-noise induction coil sensor, low-noise Ag/AgCI electrode, low-noise chopper amplifier, digital temperature-compensated crystal oscillator module, acoustic telemetry modem, and burn wire system. Finally, we discuss the results of onshore and offshore field tests to show the effectiveness of the developed seafloor electromagnetic receiver and its performance： typical E-field noise of 0.12 nV/m/rt（Hz） at 0.5 Hz, dynamic range higher than 120 dB, clock drift lower than 1 ms/day, and continuous operation of at least 21 days.展开更多
针对目前因车辆超载造成道路桥梁破坏,通过分析称重过程中影响车辆重量因素,设计了车辆动态保护式称重系统。以DSP(Digital Signal Processing)为主控器,MODEM通信接口,高精度的ADS1255采样,利用平均值滤波和中位值滤波结合数据处理,软...针对目前因车辆超载造成道路桥梁破坏,通过分析称重过程中影响车辆重量因素,设计了车辆动态保护式称重系统。以DSP(Digital Signal Processing)为主控器,MODEM通信接口,高精度的ADS1255采样,利用平均值滤波和中位值滤波结合数据处理,软件进行采样数据快速非线性修正,实现了数据采集显示、存储查询打印和通信传输等功能。实验证明,所构建的系统能有效地应用于车辆载重的在线动态识别与道路管理,测定准确可靠、抗干扰性能强、人机接口方便,具有良好的适应性。展开更多
李浴洋(以下简称李):王老师,很高兴可以在北大围绕您主编的哈佛版《新编中国现代文学史》(A New Literary History of Modem China,The Belknap Press of Harvard University Press,2017,以下简称《文学史》)对您进行访谈。1904年,在北...李浴洋(以下简称李):王老师,很高兴可以在北大围绕您主编的哈佛版《新编中国现代文学史》(A New Literary History of Modem China,The Belknap Press of Harvard University Press,2017,以下简称《文学史》)对您进行访谈。1904年,在北大前身京师大学堂任教的林传甲编棊了一部《中国文学史》,是为华人编写“中国文学史”的开端。此后百余年间,“文学史”成为中国学界进行文学研究的最为主要的著述体例与知识生产方式之一,同时亦是文学教育的不二法门。2017年,您主编的《文学史》问世,在形式与内容上都极大地挑战了既有的“文学史”传统与规范。在我看来,在1904年以降的“中国文学史”书写谱系中,此书的出版为已经相当稳固的“文学史”观念与秩序提供了一种反思、新创,甚至再生的重要契机——借用您习惯的表述,2017年由是可谓“中国文学史”建构过程中的一个“关键时刻”。展开更多
基金supported in part by the National Natural Science Foundation of China under Grant 62171187the Guangdong Basic and Applied Basic Research Foundation under Grant 2022A1515011476+1 种基金the Science and Technology Program of Guangzhou under Grant 201904010373the Key Program of Marine Economy Development (Six Marine Industries) Special Foundation of Department of Natural Resources of Guangdong Province (GDNRC [2020]009)。
文摘Wireless information and power transfer(WIPT) enables simultaneously communications and sustainable power supplement without the erection of power supply lines and the replacement operation of the batteries for the terminals. The application of WIPT to the underwater acoustic sensor networks(UWASNs) not only retains the long range communication capabilities, but also provides an auxiliary and convenient energy supplement way for the terminal sensors, and thus is a promising scheme to solve the energy-limited problem for the UWASNs. In this paper, we propose the integration of WIPT into the UWASNs and provide an overview on various enabling techniques for the WIPT based UWASNs(WIPT-UWASNs) as well as pointing out future research challenges and opportunities for WIPT-UWASNs.
基金sponsored by the 863 Program(No.2009AA09A2012012AA09A201)+1 种基金China Geological Survey Project(No.201100307)the Fundamental Research Funds of the Ministry of Education for the Central Universities(No.2652011249)
文摘In planning and executing marine controlled-source electromagnetic methods, seafloor electromagnetic receivers must overcome the problems of noise, clock drift, and power consumption. To design a receiver that performs well and overcomes the abovementioned problems, we performed forward modeling of the E-field abnormal response and established the receiver＇s characteristics. We describe the design optimization and the properties of each component, that is, low-noise induction coil sensor, low-noise Ag/AgCI electrode, low-noise chopper amplifier, digital temperature-compensated crystal oscillator module, acoustic telemetry modem, and burn wire system. Finally, we discuss the results of onshore and offshore field tests to show the effectiveness of the developed seafloor electromagnetic receiver and its performance： typical E-field noise of 0.12 nV/m/rt（Hz） at 0.5 Hz, dynamic range higher than 120 dB, clock drift lower than 1 ms/day, and continuous operation of at least 21 days.
文摘针对目前因车辆超载造成道路桥梁破坏,通过分析称重过程中影响车辆重量因素,设计了车辆动态保护式称重系统。以DSP(Digital Signal Processing)为主控器,MODEM通信接口,高精度的ADS1255采样,利用平均值滤波和中位值滤波结合数据处理,软件进行采样数据快速非线性修正,实现了数据采集显示、存储查询打印和通信传输等功能。实验证明,所构建的系统能有效地应用于车辆载重的在线动态识别与道路管理,测定准确可靠、抗干扰性能强、人机接口方便,具有良好的适应性。
文摘李浴洋(以下简称李):王老师,很高兴可以在北大围绕您主编的哈佛版《新编中国现代文学史》(A New Literary History of Modem China,The Belknap Press of Harvard University Press,2017,以下简称《文学史》)对您进行访谈。1904年,在北大前身京师大学堂任教的林传甲编棊了一部《中国文学史》,是为华人编写“中国文学史”的开端。此后百余年间,“文学史”成为中国学界进行文学研究的最为主要的著述体例与知识生产方式之一,同时亦是文学教育的不二法门。2017年,您主编的《文学史》问世,在形式与内容上都极大地挑战了既有的“文学史”传统与规范。在我看来,在1904年以降的“中国文学史”书写谱系中,此书的出版为已经相当稳固的“文学史”观念与秩序提供了一种反思、新创,甚至再生的重要契机——借用您习惯的表述,2017年由是可谓“中国文学史”建构过程中的一个“关键时刻”。
