流动地震台阵观测初至震相的自动检测   总被引：8，自引：0，他引：8       下载免费PDF全文

王继  陈九辉  刘启元  李顺成  郭飚 《地震学报》2006,28(1):42-51

震相到时的自动精确检测对实现海量波形数据自动处理有重要意义. 针对流动地震台阵观测,本文综合利用单台Akaike信息准则（AIC）和多台最小二乘互相关方法,发展了震相自动精确检测技术. 检测结果表明,在长短时平均比值方法（STA/LTA）检测地震事件的基础上,利用单台AIC方法,近震初至震相检测精度小于0.3 s;利用多台最小二乘互相关方法,能够可靠地检测高信噪比地震的初至震相到时,当信噪比较低时,能够有效地避免初至震相的错误判别.   相似文献   

海洋复杂陆坡深水区速度场建立方法探讨     

万欢  逄建东  杨平华  刘扬  何玉梅 《物探化探计算技术》2012,34(1):1-6

海洋深水探区多在陆坡区,水深变化大,最深超千米,地质条件复杂,探井稀少,难以得到准确的速度场,直接用叠加速度转换深度会导致沉积层构造畸变,若仅用钻井速度预测深水区深度也将导致巨大误差。这里在分析深水速度结构特征和影响因素基础上,通过理论模型正演方法研究优选最佳速度反演的方法;利用钻井速度、叠前相干反演速度及地震叠加速度相互制约,形成了适合白云凹陷深水区的时深转换方法,较好地解决了深水区崎岖海底造成的构造畸变,深度预测精度得到大幅提高。  相似文献   

基于FME的数据库自动制图技术探索与实践     

邓飞  陈字同  郑代扬 《国土资源信息化》2013,(4):66-68,28

传统的制图多基于图形文件进行手工操作,本文提出了一种以数据库为数据源的自动成图技术.充分应用了FME对数据的强大操作功能,摸索出一套自动化成图技术,实现了数据库的连接与数据提取,自动完成标准分幅数据提取、图面及图框整饰以及地图的批量输出工作,实际应用效果良好。  相似文献   

矿物表征自动定量分析系统(AMICS)技术在稀土稀有矿物鉴定中的应用   总被引：7，自引：1，他引：6  

温利刚  曾普胜  詹秀春  范晨子  孙冬阳  王广  袁继海 《岩矿测试》2018,37(2):121-129

云南武定迤纳厂铁-铜-稀土矿床是我国扬子地块西南缘具有代表性的元古代铁-铜-稀土矿床之一,矿床中除Fe、Cu外,还伴生REEs、Nb、Co、Mo、Au、U等元素。由于矿石矿物组成复杂,并且稀土、稀有矿物结晶粒度细小、嵌布特征复杂,使用传统的测试技术很难准确地识别鉴定,因此该矿床中稀土、稀有(铌)矿物的赋存状态研究一直较为薄弱。本文应用目前国际上矿物与地质行业先进的矿物自动分析系统——矿物表征自动定量分析系统(AMICS),结合扫描电镜-能谱仪(SEM-EDS)显微结构原位分析技术,实现了常规岩矿鉴定手段难以完成的矿物定量识别和鉴定,准确地测定了武定迤纳厂铁-铜-稀土矿床脉状矿石中矿物种类及其含量,在脉状矿石发现了含量可观的氟碳钙铈矿(0.82%)和少量的含铌金红石(0.02%)等稀土稀有矿物。研究表明,除了铁氧化物成矿阶段,在铜硫化物成矿阶段也伴随有稀土成矿作用,因此可将主矿化期划分为铁氧化物-稀土矿化阶段(Ⅱ-1)和铜硫化物(-金)-稀土矿化阶段(Ⅱ-2)。研究成果为矿石中稀土、稀有金属等战略矿产资源的综合利用及矿床的进一步研究提供了可靠的数据,同时建立了一套先进、实用的岩石矿物鉴定技术,可望在地质、勘探、资源的有效利用等领域得到更广泛应用。  相似文献   

An evaluation of an automated hollow-fibre ultrafiltration apparatus for the isolation of colloidal materials in natural waters     

N. A. Marley  J. S. Gaffney  K. A. Orlandini  C. P. Dugue 《水文研究》1991,5(3):291-299

Colloidal materials and macromolecules that are less than 0.45 mircons in diameter can act to transport both hydrophobic and hydrophilic contaminations in subsurface waters. An automated hollow-fibre ultrafiltration apparatus is described and evaluated regarding its ability to physically size and isolate colloidal materials from natural waters. Sufficient size-fractionated colloidal samples can be obtained from 60 litre samples to perform inorganic, organic, and radionuclide characterizations, as well as allow the binding capacities of humic and fulvic materials to be evaluated. Samples processed in the field with the automated system were compared with laboratory analyses using single cartridge hollow-fibre ultrafilters and found to agree well with each other. Typical sample reproducibilities were with 15 per cent. The results indicate that field collection of colloidal materials is feasible with minimal sample perturbation using the automated sampler.  相似文献   

一种新分维估值方法作为工具的自动制图综合   总被引：11，自引：1，他引：11  

王桥  吴纪桃 《测绘学报》1996,25(1):10-16

本文运用分形几何原理，建立了一种面向制衅综合的新分维估值方法，并以此为工具，研究了阈值自动选取、图形形状特征保持、曲线按复杂程度分段等一些自动制图综合中存在的难题，给出了相应的算法和应用实例。  相似文献   

Analysis of Pulp Mill EOP Bleaching Process Effluent by Thin-layer Chromatography with Automated Multiple Development (AMD-HPTLC)     

F. Dethlefs  H.-J. Stan 《洁净——土壤、空气、水》1996,24(2):77-84

High-performance thin-layer chromatography with automated multiple development (AMD-HPTLC) was applied for the examination of pulp mill bleachery effluents from an alkali-oxygen-peroxide (EOP) bleaching stage of a sulfite pulp. A gradient based on methanol and dichloro-methane was developed for the separation of the effluent compounds over a wide range of migration distances. A series of reference substances such as lignin phenols and other aromatic acids, aldehydes, and alcohols as well as two resin acids were investigated in parallel using the AMD-HPTLC method. Characterization of the effluent compounds was possible using the migration distances and the recorded spectra. The composition of different samples of effluent were found to be very similar. The application of the AMD-HPTLC to effluent fractions from acidic liquid-liquid extraction using diethyl ether and from RP C18 solid-phase extraction allowed us to follow the behaviour of the effluent compounds in the extraction procedure.  相似文献   

High Resolution, Deep-Tow Seismic Survey to Investigate the Methane Hydrate Stability Zone in the Nankai Trough     

Peter Ward    Eiichi Asakawa  Shoshiro Shimizu 《Resource Geology》2004,54(1):115-124

Abstract. A high frequency deep-tow seismic survey was carried out in the Nankai Trough area in 1996. The objective of the survey was to obtain high resolution seismic sections and velocity profiles of the methane hydrate zone, inferred from the strong BSR events seen on conventional seismic data in the area. A special feature of the survey is that both the source and the streamer cable are towed close to the seabed. This special acquisition geometry requires special data processing to handle the varying source and receiver depths. A CMP floating datum processing sequence was designed which led to high quality sections of the shallow geology. A key step in the processing was devising a residual statics technique to compensate for errors in the measured depths.
The processing sequence was applied to a number of lines, totaling 200 km. The final data quality was highly variable. Some lines produced high quality sections and others, much poorer sections with few interpretable events. Conventional seismic data in the area also shows variation in the data quality so part of the reason is a variation in the sub-sea geology, but the deep-tow data is much more sensitive to change in conditions than conventional data. With the current acquired data and processing sequence the deep-tow system offers most advantages when 1) the water depth is around 1 km or greater, 2) the seabed and underlying geology is not too complex, and 3) the acquisition proceeds smoothly with regular shotpoints, slowly varying depths, and with accurate positioning.  相似文献   

面向Java手机GPS数据采集与无线网络传输系统的研究   总被引：10，自引：0，他引：10  

李鲁群  李明禄 《武汉大学学报(信息科学版)》2004,29(8):728-731

通过对Java手机硬件性能的分析 ,提出了面向Java手机GPS数据采集与无线网络传输系统方案 ,并以Motorola388手机对GPS数据采集串行通讯和GPRS无线数据传输为试验 ,证明了方案的可行性  相似文献   

Automated water sampling in ephemeral hydrological systems     

B. J. Vivian  J. N. Quinton 《地球表面变化过程与地形》1993,18(9):863-868

A wide variety of sampling programmes may now be considered practical with the recent developments in data logger and water sampler technology. In ephemeral systems the water sampler remains idle for long periods between events. Two approaches are described which overcome the problems of sampling in ephemeral systems: short interval time dependent sampling (TDS) and automated flow proportional sampling (FPS). Both approaches utilize the data logger's ability to perform intermediate operations on incoming data to control the initiation of water sampling. The logger programs are described and allow many recorder/water sampler units to be controlled from one device. The relative merits of the two approaches are discussed in terms of experimental requirements and data precision.  相似文献