长跨度桥梁防雷检测技术探讨     

罗伟  徐建宁  蒙文文  刘平禄 《气象研究与应用》2014,35(4):124-126

从直击雷、侧击雷防护和防雷击电磁脉冲三个方面对长跨度桥梁防雷检测内容、项目进行探讨,提出长跨度桥梁防雷检测应注意的一些问题。  相似文献   

帕米尔高原东缘中深源地震特征探讨     

赵建中  杨成荣 《地震地磁观测与研究》2013,(5):70-74

对帕米尔东缘区域中深源地震与浅源地震进行波形对比,并使用交切法和Hyposat地震定位方法进行地震定位对比,从不同角度探讨该区域中深源地震特征.  相似文献   

基于空间谱估计的闪电定位算法研究与分析     

卢舟  孙秀斌  刘洋  王少娟 《成都信息工程学院学报》2014,29(3):232-237

为了减少闪电对人类生命财产和各种电子设备造成的损失,同时研究雷暴活动的形成机制,并为闪电监测预警提供技术支持,开展闪电定位算法研究具有重要意义。闪电发生时辐射从极低频到甚高频范围的电磁脉冲,通过闪电定位系统获取闪电辐射源脉冲信号参数便可定位闪电。概述了闪电定位原理及基本方法,比较了基于空间谱估计的Capon算法、MUSIC算法及2种改良算法,介绍了基于均匀圆阵的二维MUSIC算法。采用Matlab分析了这几种闪电定位算法的性能,最后提出二维修正MUSIC算法,为闪电定位系统提供坚实的理论依据。  相似文献   

A long‐range and high‐resolution underwater acoustic positioning system     

Tomoyoshi Takeuchi 《Marine Geodesy》2013,36(3-4):225-231

Abstract

It is desired to track the location of an underwater data collecting platform using acoustic range data. A long‐range and high‐resolution acoustic system for underwater locating has been investigated. The system provides continuous and highly accurate tracking of a platform referenced to bottom‐mounted buoys. Each reference buoy contains an acoustic transponder, which is used to obtain ranging data from the transponder to the platform. The transponder has a signal source that is phase‐modulated by a maximal‐length binary sequence and a correlation processing unit to be capable of detecting received acoustic signals with high SNR in a noisy environment or in attenuation due to long‐range propagation, and to identify multipath acoustic signals. The acoustic system has been designed and sea tests tried. The results of that experiment have yielded capability of a submeter underwater acoustic positioning system.  相似文献   

中国地震观测台网地震速报定位偏差的分析   总被引：11，自引：1，他引：10  

孟玉梅  赵永  王斌 《地震》2001,21(3):65-69

介绍并分析了中国地震速报台网目前地震速报定位的现状、存在的问题及原因,并利用1990～1997年的速报定位资料,统计分析了中国地震速报台网测定地震震中位置的偏差、产生偏差的原因,并提出了相应的改进意见。  相似文献   

湘中锑矿带断裂体系分维及其对成矿流体运移和矿床定位的指示作用   总被引：7，自引：0，他引：7  

卢新卫  马东升 《矿床地质》1999,18(2):168-174

根据分形理论计算了湘中各锑矿带断裂体系的计盒维数和信息维数。通过对各矿带断裂体系分维特征与锑矿分布之间关系的分析,发现断裂体系的分维高值区与锑矿分布密集区相对应,这不仅表明断裂是成矿流体运移的主要通道,同时也表明断裂体系分维特征是定量描述锑矿床定位及成矿流体运移,聚集条件的一个重要参数。  相似文献   

The Present Status and Prospect of Earthquake Focal Depth Locating     

Zheng Yong  Xie Zujun 《中国地震研究》2018,32(3):330-343

Locating an earthquakes focal depth is always a key project in seismology. Precise focal depth is of critical importance for evaluating seismic hazards, deciphering dynamic mechanisms of earthquake generating,estimating aftershock evolutions and risk,as well as monitoring nuclear tests. However,how we determine an accurate focal depth is always a challenge in seismological studies. Aiming to solve these problems, we analyzed and summarized the present status and the future development of earthquake focal depth locating. In this paper we first reviewed the present status of focal depth locating in the world,and summarized the frequently-used relocating methods and ideas at present,and introduced two types of focal depth relocating ideas: arrival time relocating and waveform modeling methods. For these ideas,we systematically described the S-P and the Pn-Pg methods that belong to arrival time method,and polarization focal depth locating and amplitude focal depth locating that belongs to waveform modeling,and further analyzed the advantages and limitations of these methods. Since the depth phase methods are highly sensitive to focal depth,and are relatively free from the uncertainties of crustal models,we mainly reviewed the depth phases of s Pm P,s PL,s Pn,and s Sn,and quantitatively evaluated their availabilities and characteristics. Second,we also discussed the effects of crustal velocity models on the reliability of focal depth locating,and reviewed the advancements of seismic tomography techniques over recent years. Finally,based on the present status of the progress on the focal depth locating,and studies of seismic velocity structures,we proposed an idea of combining multiple datasets and relocating methods,jointly utilizing seismologic and geodetic techniques to relocate focal depth,which should be the major research field in investigating focal depth and source parameters in the near future.  相似文献   

起伏海面对反射地震偏移成像结果的影响          下载免费PDF全文

孟祥羽  孙建国  孙章庆  魏脯力  徐则双 《地球物理学报》2019,62(8):3155-3163

实际海面受风浪的影响是个随机起伏的复杂曲面.一个随机起伏的自由表面对地震波形成相当复杂的散射,进而影响波场在靶区的二次照明与成像结果;此外,起伏海面具有小尺度随机起伏的特性,难以用贴体网格等处理大尺度起伏地表的常规方法和技术对其进行逼近和处理.鉴于此,利用不等距有限差分法实现小尺度起伏海面的波场自由表面边界条件,以此进行正演、波场照明分析;利用逆时偏移（Reverse Time Migration,RTM）进行起伏海面下的成像并对成像结果进行分析.不同模型的试算结果表明：起伏海面引起的复杂散射使靶区地下照明不均匀、成像界面发生弯曲和畸变,从而降低成像结果的分辨率和信噪比.  相似文献   

陕西凤太矿集区铅锌矿的矿体定位规律研究          下载免费PDF全文

曾令高  张均  胡鹏  石凯 《地质找矿论丛》2011,26(1):1-7

文章从凤太矿集区铅锌矿床分布特征、地层岩性和构造对成矿的控制、矿体的空间产出特征等方面入手,运用定性和定量方法对凤太矿集区铅锌矿的矿体定位规律进行了系统研究.区内铅锌矿的形成明显受控于地层、岩性、同生断裂、同沉积背斜等致矿地质因素,矿体赋存于特定的地层-岩性-构造组合,空间展布具有规律性侧伏.  相似文献