高频轻便数字大地电磁测深系统          下载免费PDF全文

邓前辉  张木生  赵国泽  汤吉 《地震地质》1988,10(4):151

高频轻便数字大地电磁测深系统是一套仅用两块12V汽车电瓶供电的MT系统。文中扼要地叙述了系统的优点,主要软硬件的功能、野外工作的操作,室内资料处理的流程和资料处理结果等。该系统的主要特点是:(1)频带宽,250Hz—4000s;(2)功耗低,用两块12V汽车电瓶可连续工作24小时;(3)轻便灵活、使用方便;(4)软件齐备,应用灵活,处理时可自动进行也可通过人机对话进行  相似文献   

宁夏地震短信息统计及守护处理软件     

吉祥  蔡新华  常明 《高原地震》2006,18(1):56-60

宁夏地震局短信息统计及守护处理软件是基于本局原有短信息平台,利用Vi-sual Basic作为开发工具、采用ADO作为数据库访问接口、结合结构化查询语言及VB的TIMER控件,实现了地震短信息发送、接收情况的统计、打印以及对接收到的地震短信息进行自动检索和分类处理等功能。  相似文献   

基于VB．NET征地拆迁数据处理系统的设计与实现     

柯福阳  余学祥 《国土资源信息化》2006,(4):25-28

为了解决征地拆迁数据处理过程中数据量大、统计复杂、容易出错、查询困难等问题,基于VB-NET成功研制了征地拆迁数据处理软件。它的研制成功将提高工作效率,使征地拆迁工作走向科学化、规范化管理。本文介绍了LANDMS软件的结构、组成、功能、测试及特点。  相似文献   

Accuracy of OPUS solutions for 1- to 4-h observing sessions     

T. Soler  P. Michalak  N. D. Weston  R. A. Snay  R. H. Foote 《GPS Solutions》2006,10(1):45-55

We processed 30 consecutive days of Global Positioning System (GPS) data using the On-line Positioning Users Service (OPUS) provided by the National Geodetic Survey (NGS) to determine how the accuracy of derived three-dimensional positional coordinates depends on the length of the observing session T, for T ranging from 1 h to 4 h. We selected five Continuously Operating Reference Stations (CORS), distributed widely across the USA, and processed the GPS data for each with corresponding data from three of its nearby CORS. Our results support the current OPUS policy that recommends using a minimum of 2 h of static GPS data. In particular, 2 h of data yielded a root mean square error of 0.8, 2.1, and 3.4 cm in the north, east, and up components of the derived positional coordinates, respectively. Results drastically improve for solutions containing 3 h or more of GPS data.  相似文献   

A neuro-genetic approach for prediction of time dependent deformational characteristic of rock and its sensitivity analysis   总被引：1，自引：0，他引：1  

T. N. Singh  A. K. Verma  P. K. Sharma 《Geotechnical and Geological Engineering》2007,25(4):395-407

The creep strain is proportional to the logarithm of the time under load, and is proportional to the stress and the temperature. At higher temperatures the creep rate falls off less rapidly with time, and the creep strain is proportional to a fractional power of time, with exponent increasing as the temperature increases and reaching a value ∼1/3 at temperatures, of about 0.5 T _m. At these temperatures the creep increases with stress according to a power greater than unity and possibly exponentially increases with temperature as (−U/kT), where U is an activation energy and k is Boltzman’s constant. There are different methods to determine the creep strain and the energy of Jog (B) such as by experimental methods and multivariate regression analysis etc. These methods are cumbersome and time consuming. In conjunction with statistics and conventional mathematical methods, a hybrid method can be developed that may prove a step forward in modeling geotechnical problems. In the present investigation, Artificial Neural Network (ANN) technique and Co-active neuro-fuzzy inference system (CANFIS) backed Genetic algorithm technique have been used for the prediction of creep strain and energy of Jog (B), and a comparative study has made between the two models.  相似文献   

大数据与数学地球科学研究进展——大数据与数学地球科学专题代序   总被引：12，自引：9，他引：3  

周永章  陈铄  张旗  肖凡  王树功  刘艳鹏  焦守涛 《岩石学报》2018,34(2):255-263

大数据与数学地球科学的核心应用技术包括高维数据降维、图像数据处理、无限数据流挖掘、机器学习、关联规则算法与推荐系统算法等。人工智能地质学,包括大数据-智能矿床成因模型与找矿模型的构建,是具有重要价值的研究方向。高维数据降维旨在从初始高维特征集合中选出低维特征集合,有效地消除无关和冗余特征,增强学习结果的易理解性。哈希算法、聚类分析、主成分分析等是较常用的数学降维工具。机器学习是人工智能的核心,是使计算机具有智能的根本途径。机器学习与人工智能各种基础问题的统一性观点正在形成。深度学习的训练模型往往需要海量数据作为支撑,因此迁移学习方法日益受到重视。图像模式识别是大数据挖掘的重要技术。网络中的社区结构识别对理解整个网络的结构和功能有重要价值,可帮助分析、预测网络各元素间的交互关系。沉浸式虚拟现实技术是实现大数据可视化的重要方向,对具有多元、异构、时空性、非线性、多尺度地质矿产勘查数据的展示要求有特别的价值。引入VR技术进行矿产地质大数据的可视化,可实现大数据时代矿产勘查数据的新认知。无限数据流在地质、地球化学、地球物理监测中大量存在,甚至可以持续自动产生。对数据流数据的计算包括对点查询、范围查询、内积查询、分位数计算、频繁项计算等。关联规则和推荐系统算法是大数据挖掘中的重要算法,其应用范围越来越广泛。贝叶斯原理在大数据时代有独特的价值,贝叶斯网络是成因建模的一个革命性工具。智能地质学研究刚刚起步,构建大数据-智能矿床成因模型与找矿模型是智能地质学研究的重要内容。矿床模型研究方式的变革,将出现于互联网、云计算技术环境下全球各地的矿床研究团队的共同参与。  相似文献   

Source location variability and volcanic vent mapping with a small-aperture infrasound array at Stromboli Volcano,Italy     

Jeffrey?B.?JohnsonEmail author 《Bulletin of Volcanology》2004,67(1):1-14

Stromboli Volcano in Italy is a persistently active, complex volcanic system. In May 2002 activity was confined to 3 major summit craters within which several active vents hosted multiple explosions each hour. During a 5-day field campaign an array of 3 low-frequency microphones was installed to investigate the coherent infrasound produced by degassing from these vents. Consistent phase lags across the 3 stations indicate distinct sources that are subsequently investigated to determine the associated vent location, apparent depth, and origin time. The cross-correlation routine allows for variations in comparison window length, waveform filtering bandwidth, and correlation and consistency thresholds, allowing for improved detection of certain types of degassing sources. Identification of activity at the various vents could be subsequently corroborated with 3 channels of synchronously acquired thermal data and video. During the May 2002 experiment persistent, energetic infrasound was observed from a passive degassing source within the Central Crater (CC) and transient infrasound, produced by discrete Strombolian explosions, was identified at 4 additional vents. The continuous infrasound produced by the CC exhibits variable frequency-dependent correlation lag times that are interpreted as a diffraction effect due to the acoustic radiators recessed location within a steep-walled crater. Such dispersion has important implications for accurate eruption source modeling because it indicates that infrasonic waveforms may be significantly filtered during propagation. Transient explosion signals from the Northeast Crater (NEC) and Southwest Crater (SWC) vents also exhibit dynamic correlation lag times, but this scatter may be more reasonably attributed to variable epicentral locations. Explosions from the NEC west vent, for instance, appear to emanate from a diffuse zone with a lateral extent in excess of 10 m.Editorial responsibility: R. Cioni  相似文献   

Development in Precision Seafloor Survey and Mapping in China     

Su Jilan  Chen Bangyan  Jin Xianglong 《Marine Geodesy》2002,25(1):79-86

This article presents a general introduction to the development in China since 1980s in precision seafloor survey and mapping. Emphasis is given to the processing and integration of data from the acquisition system centered on the multibeam bathymetric survey equipment, and to the interactive map generation systems, MBChart, SeaMap, and SeaGIIS. Application of these systems will also be described.  相似文献   

Eddy Detection Over Southern Indian Ocean Using TOPEX/POSEIDON Altimeter Data   总被引：1，自引：0，他引：1  

R. M. Gairola  Sujit Basu  P. C. Pandey 《Marine Geodesy》2001,24(2):107-121

Mesoscale eddies constitute the most energetic component of the variability of ocean currents. An attempt has been made for the detection of oceanic mesoscale eddy signatures over the Southern Indian Oceanic (SIO) regions using the dynamic topography derived from TOPEX/POSEIDON (T/P) altimeter data, by the signal processing technique, called matched filtering. After applying all the ocean and atmospheric corrections, data of a complete cycle of T/P over SIO has been used for detection of eddy signatures. The geoid undulations are removed from the data of corrected sea surface height from T/P and the resulting dynamic topographic data are passed through a matched filter designed to detect a generic eddy signature of Gaussian signal embedded in noise. The filter is optimized to detect eddies with amplitude 20 to 30 cm and diameters roughly 100?250 km. Out of all the analyzed data of T/P orbits over SIO a few examples are presented for brevity. Qualitative verification of eddies is done with some independent T/P sea level anomaly data over the region. The analysis shows that the matched filtering technique is most suitable for monitoring eddy signatures along the subsatellite track instantly over the remote and most hostile regions of the southern global oceans.  相似文献   

综合处理软土法在特殊路基设计中应用     

REN Yu-fen  邓安云 《云南地质》2008,27(1):91-96

综合处理软土方法技术在沿海地区有较好的应用前景。结合广东佛山市公路建设,解决不均匀沉降问题。  相似文献