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点源干扰源定位方法及其在地电场观测中的实际应用

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地震学报 2024年第1期46卷 106-119页

作者：张宇王兰炜胡哲张兴国娄晓宇中国地震局地震预测研究所北京100036 应急管理部国家自然灾害防治研究院北京100085

我国地震地电场观测时的漏电干扰问题会影响到观测质量和地震监测效能。针对这一实际问题,本文提出了点源干扰源定位方法。该方法首先建立地表点源对地电场观测影响模型,根据模型计算点源对地电场观测的干扰幅度,然后求解干扰源相对于... 详细信息

我国地震地电场观测时的漏电干扰问题会影响到观测质量和地震监测效能。针对这一实际问题,本文提出了点源干扰源定位方法。该方法首先建立地表点源对地电场观测影响模型,根据模型计算点源对地电场观测的干扰幅度,然后求解干扰源相对于中心电极的位置。将定位方法应用于高邮地震台和汉王地震台实际干扰源排查工作中,定位结果与实际干扰源位置基本一致,测区外干扰源定位误差小于2%,测区内干扰源定位误差小于20 m,并对影响计算误差的因素进行了分析。两个台站的实际应用表明:本文提出的定位方法为地电观测实践中查找点源漏电干扰源提供解决方案,能够有效地定位点源干扰源位置,提高干扰排查效率。

关键词：地电场观测漏电点源干扰源定位方法

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高压直流输电对地电场观测影响特征分析

高电压技术 2024年第3期50卷 1244-1251,I0024页

作者：李钟慧王兰炜张宇张兴国蒋延林张秀霞国家自然灾害防治研究院北京100089 中国地震局地震预测研究所北京100036 高邮地震台高邮225600 江苏省地震局南京210014

随着我国“西电东送、南北互供、全国联网”基本战略的实施,多条高压直流输电线路投入运行,对地电场观测造成的干扰愈显突出。为此,总结了全国地电场台站受高压直流输电干扰特征和规律,从统计意义上概括典型干扰形态,包括方波、尖峰和方... 详细信息

随着我国“西电东送、南北互供、全国联网”基本战略的实施,多条高压直流输电线路投入运行,对地电场观测造成的干扰愈显突出。为此,总结了全国地电场台站受高压直流输电干扰特征和规律,从统计意义上概括典型干扰形态,包括方波、尖峰和方波+尖峰3种,其中以方波为主,占比约65.5%。通过理论推导,结合干扰实例,探讨了不同干扰形态产生的原因及影响机理,认为在近接地极区域表现为方波形态,在线路中心区域表现为尖峰形态,在二者重合区表现为方波和尖峰的组合形态。对比同一线路不同干扰事件,分析了干扰特征和台站与高压线路的相对位置、与接地极距离、影响区域地下结构等因素的关系,为识别和判定此类干扰提供了依据。

关键词： HVDC 地电场干扰特征接地极线路合成场

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DCY-Ⅰ型地电场仪的工频干扰抑制机制

大地测量与地球动力学 2024年第2期44卷 209-216页

作者：张兴国王兰炜胡哲张世中张宇中国地震局地震预测研究所北京100036

为更好地抑制工频干扰对观测信号的影响,在分析工频干扰的来源、分类及其对观测的影响等基础上,对比分析常用的工频共模与工频串模干扰抑制方法,并在DCY-Ⅰ型地电场观测仪器的设计中采用过采样与多级数字滤波等方法抑制工频串模干扰,采... 详细信息

为更好地抑制工频干扰对观测信号的影响,在分析工频干扰的来源、分类及其对观测的影响等基础上,对比分析常用的工频共模与工频串模干扰抑制方法,并在DCY-Ⅰ型地电场观测仪器的设计中采用过采样与多级数字滤波等方法抑制工频串模干扰,采用两级浮地的方式抑制工频共模干扰,对工频干扰起到了很好的抑制效果。

关键词：地电场观测仪器工频干扰抑制共模干扰串模干扰

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GEF-Ⅱ地电场仪的研制及应用

中国地震 2024年第2期40卷 470-483页

作者：张兴国王兰炜张宇胡哲张世中中国地震局地震预测研究所北京100036

地电场观测是地球物理场观测的一种重要手段。利用ARM与FPGA技术研制了新型GEF-Ⅱ地电场观测仪,该仪器包括多通道数据采集、数字信号处理、控制与服务等几部分,具有输入阻抗大、测量精度高、短路噪声小的特点,实现了地电场的连续、自动... 详细信息

地电场观测是地球物理场观测的一种重要手段。利用ARM与FPGA技术研制了新型GEF-Ⅱ地电场观测仪,该仪器包括多通道数据采集、数字信号处理、控制与服务等几部分,具有输入阻抗大、测量精度高、短路噪声小的特点,实现了地电场的连续、自动测量,满足地震监测预测研究的需求。自2017年以来,该系统已广泛应用于我国地震监测台网中,为地震监测预测和科学研究提供了可靠的观测数据。

关键词：地电场数字滤波现场可编程

CSES GNSS ionospheric inversion technique, validation and error analysis

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Science China(Technological Sciences) 2018年第5期61卷 669-677页

作者： LIN Jian SHEN XuHui HU LiangChen wang lanwei ZHU FuYing Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration Institute of Crustal Dynamics China Earthquake Administration

With the increased number of low Earth orbit(LEO) satellites equipped with global navigation satellite system(GNSS) receiver,the LEO based GNSS slant total electron content(TEC) and electron density profile(EDP) data play an increasingly important role in space weather and ionospheric research due to improved global coverage. China Seismo-Electromagnetic Satellite(CSES), which was launched in February 2018, is equipped with GNSS receiver for either precise orbit determination(POD) and ionospheric inversion. The purpose of the present paper is to validate CSES GNSS ionospheric inversion technique based on the real observations and verify the accuracy of TEC and EDP retrieval based on the simulated data. The following conclusions can be drawn: the epoch difference inversion(EDI) derived from CSES can successfully retrieve the EDPs without non-occultation side measurements; the technique of EDI and the calibrated TEC inversion(CTI) have similar behaviors in inversion errors,however, the retrieved Nm F2 and hm F2 have a larger systematic error surrounding the equatorial ionization anomaly(EIA)where the assumption of spherical symmetry is often invalid; the precision and accuracy of retrieved TEC have been investigated in the paper based on the simulated data, and it is found that the accuracy of the retrieved TEC is relative to solar activity: the lower the F10.7 index, the higher the accuracy of retrieved TEC.

关键词： China Seismo-Electromagnetic Satellite global navigation satellite system total electron content electron density profile

Research on geo-electrical resistivity observation system specially used for earthquake monitoring in China

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Earthquake Science 2011年第6期24卷 497-511页

作者： Jialiu Zhao lanwei wang Jiadong Qian Institute of Earthquake Science China Earthquake Administration Beijing 100036 China Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

This paper deals with the design and development of the observational system of geo-electrical resistivity on the basis of the demands for exploring the temporal variations of electrical properties of Earth media in the fixed points of the networks, which would be associated with the earthquake preparation. The observation system is characterized by the high accuracy in measurement, long term stability in operation and high level of rejection to the environmental interference. It consists of three main parts, configuration system measurement system, the calibration and inspection system.

关键词： geo-electrical resistivity observation system earthquake monitoring configuration system measurement system calibration and inspection system

AI时代阅读偏食现象研究:驱动因素与治理策略

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图书馆 2024年第7期 22-30页

作者：王兰伟肖海清王鑫瑶郭楠楠袁虹湖南图书馆长沙410011 桂林师范高等专科学校图书馆广西桂林541199 河北大学管理学院河北保定071002 桂林师范高等专科学校特色馆藏文献资源开发与应用研究中心广西桂林541199

阅读偏食作为信息偏食投射到阅读领域的一种具体现象,随着AI技术的发展愈发突显,探究AI时代读者阅读偏食现象对深化全民阅读推广、推行阅读服务实践等具有重要意义。文章以有关阅读偏食的网络公开语料为数据源,利用MAXQDA(2022版)质性... 详细信息

阅读偏食作为信息偏食投射到阅读领域的一种具体现象,随着AI技术的发展愈发突显,探究AI时代读者阅读偏食现象对深化全民阅读推广、推行阅读服务实践等具有重要意义。文章以有关阅读偏食的网络公开语料为数据源,利用MAXQDA(2022版)质性分析软件对语料进行归纳式内容编码,识别相关要素,引入“物理一事理一人理”(WSR)系统方法论,构建阅读偏食驱动因素WSR模型,并进行阐释分析。研究发现AI时代读者阅读偏食表现为阅读失衡、阅读偏好和阅读“厌食”,并受不同驱动因素影响:物理层面表现为内容题材、读物形式和内容质量,事理层面表现为阅读推荐、阅读引导和市场环境,人理层面表现为阅读习惯、阅读能力和阅读素养等。据此,文章提出物理维应优化阅读资源组合、事理维应加强外部有力引导、人理维应强化内部素养提升的治理策略。

关键词：人工智能阅读偏食驱动因素治理策略 WSR系统方法论

Discussion on several important problems in earthquake-related electromagnetic disturbance monitoring in China

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Earthquake Science 2011年第6期24卷 583-591页

作者： lanwei wang Shizhong Zhang Yu Zhang Dapeng Liu Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

Earthquake-related electromagnetic observation aims at finding abnormal electromagnetic variation associated with earthquake possibly. The existing studies have proved that this method is, to a large extent, effective in short-term and impending earthquake predication. This paper summarizes progress and discusses some related problems in this field. Some requirements for observation system have been proposed to improve monitoring level. As a case observation using the reformed observation system in Jinghai seismologie station, Tianjin, some results are given.

关键词： earthquake-related electromagnetic disturbance geo-electric field magnetic field elec-tromagnetic disturbance event

The state-of-the-art of the China Seismo-Electromagnetic Satellite mission

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Science China(Technological Sciences) 2018年第5期61卷 634-642页

作者： SHEN XuHui ZHANG XueMin YUAN ShiGeng wang lanwei CAO JinBin HUANG JianPing ZHU Xing Hong PIERGIORGIO Picozzo DAI JianPing Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China Institute of Earthquake Science China Earthquake Administration Beijing 100085 China DFH Satellite Co. Ltd. Beijing 100081 China School of Space and Environment Beihang University Beijing 100191 China Italian National Institute of Nuclear Physics Roma 00133 Italy Beijing Special Engineering Design and Research Institute Beijing 100028 China

The China Seismo-Electromagnetic Satellite(CSES) mission was proposed in 2003 and approved in 2013 after ten years' scientific and engineering demonstrations. To meet the requirement of scientific objectives, the satellite is designed to be in a sunsynchronous orbit with an altitude of 507 km and descending node time of 14:00 LT. The CSES satellite carries 8 instruments,including search-coil magnetometer(SCM), electric field detector(EFD), high precision magnetometer(HPM), GNSS occultation receiver(GOR), plasma analyzer package(PAP), langmuir probe(LAP), high energetic particle package(HEPP) and detector(HEPD), and tri-band beacon(TBB), among which HEPD is provided by Italian Space Agency. The CSES satellite was launched successfully on February 2, 2018, and is planned to operate for 5 years. The CSES mission is the first satellite in China to measure geophysical fields, which will have a lot of application prospects in the study of seismology, geophysics, space sciences, and so on.

关键词： China Seismo-Electromagnetic Satellite seismo-ionospheric disturbance lithosphere-atmosphere-ionosphere coupling geomagnetic fields ionosphere