矿产地质勘查项目研判ABC

矿产地质勘查是高投入、高风险、高回报的投资活动,如何引进经济、优质的矿权是矿产地质勘查的先决条件和企业赖以发展的基础.对项目高效、快速、准确的研判是项目研发最重要的一步.文章把矿权分为3种矿权来源和4种项目类型.通过3种矿权来源点评和4种项目类型的剖析,探讨了项目研判的内容、研判的准则、研判的工作程序,把研判过程分为初判、普判、详判3个阶段.在此基础上研究了研判各阶段时间安排与具体工作内容,普判阶段编图方法、取样间距和取样方法,普判阶段工作量及费用概略估计,以及详判阶段的几个关键问题.     

Stratigraphic architecture and sedimentology of a Late Pleistocene subaqueous moraine complex,southwest Ireland

Glacigenic sediments exposed in coastal cliffs cut through undulatory terrain fronting the Last Glacial Maximum laterofrontal moraine at Waterville on the Iveragh Peninsula, southwest Ireland, comprise three lithofacies. Lithofacies 1 and 2 consist of interdigitated, offlapping and superimposed ice‐proximal subaqueous outwash and stacked sequences of cohesionless and cohesive subaqueous debris flows, winnowed lag gravels and coarse‐grained suspension deposits. These are indicative of sedimentation in and around small grounding line fans that prograded from an oscillating glacier margin into a proglacial, interlobate lake. Lithofacies 3 comprises braided river deposits that have undergone significant syn‐sedimentary soft‐sediment deformation. Deposition was likely related to proglacial outwash activity and records the reduction of accommodation space for subaqueous sedimentation, either through the lowering of proglacial water levels or due to basin infilling. The stratigraphic architecture and sedimentology of the moraine at Waterville highlight the role of ice‐marginal depositional processes in the construction of morphostratigraphically significant ‘end moraine’ complexes in Great Britain and Ireland. Traditional ‘tills’ in these moraines are often crudely stratified diamictons and gravelly clinoforms deposited in ice‐proximal subaqueous and subaerial fans. Copyright © 2011 John Wiley & Sons, Ltd.     

序贯一维型边缘检测新算法

本文提出一种既可用于从图象上提取具有某种用途的一维边缘,又可用于提取具有多种用途的二维边缘的序贯一维型边缘检测新算法。由于构成该算法重要组成部分的基础算子的作用,以及将二维问题化为一维问题求解而使其明显具有简单,快速、有效的特点。该算法还具有Abdou等所建议的边缘检测算子应具有的两个特性。     

What has seismic missed?

The relative efficiencies of alternative geometric patterns of both discrete borehole and continuous grid line search have been extensively discussed in the mathematical geology literature. However, an equally important problem has received virtually no attention: How to use a sample of properties of geologic anomalies detected by grid line search of a region to estimate systematically both the number and size distribution of geologic anomalies missed by the search. We show how estimation methods developed in the sample survey design literature can be adapted to this problem, and we apply these methods to data describing 94 anomalies identified by a seismic reconnaissance survey.     

地下管线探测的基本原理及解释方法研究

本文较详细地讨论了电磁直接探测法探测地下管线的基本原理和解释方法;提出了一种新的求解管线位置和深度、并给出探测结果可信度的向量交绘法。现场提供高可信度的结果;对管线探测仪器设备及应用效果作了介绍。     

SporadicE ionization associated with meteor events

Two meteor events which were sighted in the Gujarat skies of India, were accompained by the visibility of sporadicE ionization on the ionograms recorded at Ahmedabad (Geog. Lat. 23·2°N, long. 72·30°E). The first event was the Dhajala fireball which flashed into the geoatmosphere along an E-N to W-S trail at about 20·40 h IST on 28 January 1976; the closest distance of the ground projection of meteor trail from Ahmedabad was 50km. The other event was a possible meteor group sighted over Ahmedabad on 28 May 1978, at about 21·10 h IST. This work describes the nature of the sporadicE ionization observed on Ahmedabad ionograms during the two events. Features of theEs echo during the Dhajala event which indicate that it could be of meteoric origin are discussed. Meteor theory is used to relate the observed ionization with the physical dimensions of the Dhajala meteorite as obtained by other workers.     

洱海湖盆晚第四纪地层的14C年龄测定及洱海的演变

从大理洱海湖盆西部平原湖沼相地层的分布和相关的14C年龄测定以及文物考古资料,阐述了晚更新世中期以来洱海的演变。研究表明,距今5万年以来洱海西部古湖岸线是从西向东迁移的。期间曾有过几次摆动。引起洱海古湖岸线变迁的主导因素是点苍山断块的间歇性抬升和洱海湖盆的下沉,地质历史时期的气候干湿演变也起了重要作用     

计算机天气图图形识别

根据天气系统的定义和实际业务中的天气图分析规范，总结出了５００、７００、８５０ｈＰａ３层高空天气图上特征等高线，特征等温线，槽线（含切变线），高（低）中心，冷（暖）中心以及热带气旋的识别方法及其判别式，并给出了实现计算机自动识别的程序设计步骤。     

青藏高原内陆水系冰川粒雪线与中值高度趋势面的绘制与主要特征

本选用中国冰川目录数据库中的青藏高原内陆水系冰川粒雪线、中值高度和地理坐标资料，利用计算机绘图方法，绘制出冰川粒支线、中值高度在空间的变化趋势，以便全面认识该地区的冰川发育特征。