江西省某钽铌钨锡矿山主要地质灾害及防治措施

江西省某钽铌钨锡矿是20世纪90年代探明的特大型有色、稀有金属综合矿床，为变资源优势为经济优势，2001-2003年投资数百万元对矿床进行了储量复查、论证，认定资源可靠，矿山建设时机成熟。     

含铂族元素富磁铁矿岩石的磁异常特征—以加拿大安大略地区太古代波 …

地面磁法观测到一个正的强磁异常（磁场强度高达７２０００ｎＴ）该磁异常与安大略次经济区太古代阿伯蒂比绿岩带中波士顿克里克熔岩流富铁玄武岩对应,其主矿物为与铂族元素（ＰＧＥ）有关的磁铁矿,磁异常位于磁铁矿订带（含量达２０％）的上方,且都呈卵形分布,其长轴长１０ｍ左右,在辉长－闪长岩层中沿走向分布,地质,地化以及矿物学表明,这些带含有浸染状黄铜矿＋黄铁矿。同样,有一些带含有铂族矿物（ＰＧＭ）,它们由铂族     

浅析生态伦理学在自然资源代际管理中的应用

弘扬生态伦理学已成为世界性潮流，其核心观点是尊重生命和自然界。本文以此为据探讨了自然资源代际管理中应遵循的生态伦理准则     

Anticipating the reaction: public concern about sample return missions

Shifts in public attitude that may affect extraterrestrial sample return include increased public participation in the legal and regulatory environment, institutionalized public vigilance, politicization of technological debates and shifts in the nature of public decision-making, and a risk-averse public accustomed to mass media coverage that focuses on hazards and disasters. The ice-minus recombinant DNA experiment is used as an example of the effects of public opinion on scientific experimentation.     

周至深井地下流体数字化观测技术改造及应用

介绍了周至深井数字化观测技术改造的方案设计及工程实施情况，通过对考核运行结果的具体分析，对该井地下流体的观测铲能进行了客观评价，并提出今后地下流体数字化技术改造的几点建议。     

变电站地震可恢复性研究

提出变电站地震可恢复性等级划分方法,设立评价变电站地震可恢复性的量化指标——可恢复性指数,给出基于建筑物和高压电气设备的权重系数与震害指数的变电站可恢复性指数计算公式,确定可恢复性指数与可恢复性等级对应关系,通过变电站实际震害与恢复样本研究建立变电站可恢复性矩阵。研究结果表明:随着可恢复性指数降低,变电站可恢复性越来越差,当可恢复性指数低于0.45时,变电站达到极难恢复的阈值;变电站所处的地震烈度越高时,变电站可恢复性就越低,恢复时间也越长。在9度区,变电站可恢复性指数开始快速降低,多数变电站为可恢复和难恢复,烈度为10度及以上地区,变电站极难恢复。     

在扬子板块基底变质岩系中找白钨矿的初步分析

近几年来,国内外在元古代火山-沉积变质岩系中发现了很多大、中型层控白钨矿床,并已成为一种新的和较有前景的钨矿床类型.我国华南地区层控型白(黑)钨矿床及钨、锑、金组合矿     

A first estimate of ground water ages for the deep aquifer of the Kathmandu Basin, Nepal, using the radioisotope chlorine-36

The Kathmandu Basin in Nepal contains up to 550 m of Pliocene-Quaternary fluvio-lacustrine sediments which have formed a dual aquifer system. The unconfined sand and gravel aquifer is separated by a clay aquitard, up to 200 m thick, from the deeper, confined aquifer, comprised of Pliocene sand and gravel beds, intercalated with clay, peat, and lignite. The confined aquifer currently provides an important water supply to the central urban area but there are increasing concerns about its sustainability due to overexploitation. A limited number of determinations of the radioisotope 36Cl have been made on bore waters in the basin, allowing us to postulate on the age of ground water in the deeper, confined aquifer. Ground water evolution scenarios based on radioisotope decay, gradual dissolution of formational salts as the ground waters move downgradient, and flow velocity estimations produce comparable ground water ages for the deep waters, ranging from 200,000 to 400,000 years. From these ages, we deduce a mean ground water flow velocity of only 45 mm/year from recharge in the northeast to the main extraction region 15 km to the southwest. We thus estimate current recharge at about 5 to 15 mm/year, contributing 40,000 to 1.2 million m3/year to the ground water system. Current ground water extraction is estimated to be 20 times this amount. The low specific discharge confirms that the resource is being mined, and, based on current projections, reserves will be used up within 100 years.     

CL系统扫描长方体构件的投影计算机仿真

X射线投影计算机仿真可以排除实际X射线断层扫描过程中的随机因素,更好地验证扫描方式、图像重建方法等的正确性,为实际系统的实现、完善以及重建算法的改进等提供理论依据。本文基于一种典型的计算机分层成像(CL)系统,针对电子线路板大多为长方体薄板的事实,研究了长方体构件的投影仿真计算方法;设计了仿真芯片模体,对其进行投影计算机仿真;并与系统实验结果对比,得到了较为满意的结果。该方法为后续改进图像重建算法、分析误差来源、校正伪影等研究提供了良好的基础。