直记式强震加速度仪的动态特性与高频误差分析

本文在时域、频域范围内，对直记式ＱＺＹ型（中国）、ＳＭＡ—１型（美国）、ＳＭＡＣ—Ｂ２型（日本）强震加速度仪的动态特性进行了分析，给出了评价系统跟踪和复现地震加速度信号的快速性、平稳性和准确性的动态性能指标．在此基础上，分析和讨论了直记式加速度仪的高频误差，给出了系统幅频，相频相对畸变误差公式和系统参数设置的误差估计方法，计算了加速度仪系统的高频误差分布．最后，讨论了高频误差的校正方法．     

氧化镍、二氧化钛高压相变及电导率压力效应

采用金刚石对顶砧压腔静高压技术，对氧化镍、二氧化钛在０-３２ＧＰａ压力范围内的电导率进行了测量．结果表明，电导率－压力关系曲线上的一些特征点与同一物质的高压相交点具有一致性．     

Mill-leach-waste cutoff grades for sulphidic copper ore

Summary Recent mining literature on cutoff grade theory has come to reflect some viewpoints and analyses expressed earlier in the economic literature. Agreement is best when the cutoff grade policy is established by analysis in stages, starting from the limits of the deposit, and using the maximum net present value objective. In the derivation of the optimal cutoff grade policy a dynamic programming approach is then applied to solve the overall problem as a series of linked, nonlinear, stage optimization problems. A wholly satisfactory use of a dynamic programming methodology requires that two conditions be satisfied: the separability and optimality conditions. The former is, strictly, violated by a heap-leaching or dump-leaching process, the latter by possible forms of resource rent taxation. This paper considers the problem of including such a leaching process in a cutoff grade policy analysis along aforementioned lines. It concludes that a workable method of doing so may be found which, in particular, may be quite satisfactory in arid climates where, in addition, some practical leaching experience already exists.     

灰色系统关联度的新模型及其在预测矿体埋深中的应用

首先提出了灰色系统关联度的一个新模型，分析了该模型的性质，其次讨论了应用该模型和关联滤波法预测矿体埋深的问题，然后进行了理论模型试算，证实了本方法的理论效果，最后，指出了新模型的主要优点。     

金川露天矿高边坡的反射地震CT探测研究

高边坡的岩体结构和稳定性研究是工程地质研究的一个重要课题。本次探测使用高分辨率数字地震仪和反射地震CT方法,对金川露天矿高边坡的岩体结构进行了深入细致的探测与研究,清楚地揭示了边坡岩体中优势结构面的产状和组合关系,以及边坡表层松动带厚度分布,未发现顺坡软弱岩层。     

盐用做高温高压实验传压介质一种新方法

固体传压高温高压岩石三轴实验中，固体传压介质是影响实验结果的重要因素，ＮａＣｌ介质以它流动性好，围压均匀等特点，八十年代以来越来越受到人们青睐。本文用ＮａＣｌ介质在〈３ＧＰａ固体传压三轴流变仪〉上进行了高温高压岩石流变特性的实验研究，并达到了较高的压力（〉２ＧＰａ）和温度（〉１２００℃）；本文同时利用ＮａＣｌ介质对样品装样方式及温度、压力等相关测定方面进行了研究。     

华北地区韧性剪切带几种岩石的波速各向异性高温高压实验研究

对华北地区韧性剪切带几种代表上、中、下地壳深度的糜棱岩及其围岩在高温高压条件下进行纵波速度测定及各向异性研究．对实验样品的纵波速度测定得到以下结果：１．沿糜棱岩面理方向的纵波速度大于与面理垂直方向的纵波速度，差值为０．１５-０．３０ｋｍ／ｓ，各向异性为３％-５％；２．糜棱岩的纵波速度低于其围岩的纵波速度，差值为０．１０-０．４５ｋｍ／ｓ；３．中地壳角闪岩相糜棱岩的纵波速度各向异性高于上地壳绿片岩相糜棱岩和下地壳麻粒岩相糜棱岩的各向异性；４．地震波速各向异性与糜棱岩矿物优选定向有关．     

Coda waves: A review

The analysis and interpretation of coda waves have received increasing attention since the early seventies. In the past few years interest in this subject has spread worldwide, and the study of high-frequency seismic coda waves has become a very important seismological topic. As a conclusion of the studies accomplished in this time, coda waves are considered the result of scattering processes caused by heterogeneities acting on seismic waves.P andS waves play a particularly important role in this interaction. The process introduces an attenuation which, added to the intrinsic absorption, gives the observed apparent attenuation. Therefore, coda waves constitute a thumbprint left by the heterogeneities on the seismograms. Coda waves offer decisive information about the mechanism of how scattering and attenuation take place. This review describes coda waves in detail, and summarizes the work done in this subject to 1986. The relation between coda waves and attenuation in the context of research on seismic scattering problems is stressed. Particular attention has been given to the application of coda waves to estimate source and medium parameters. The state-of-the-art of the temporal variations of coda wave shape, and the possible use of these variations as an earthquake precursor also are presented. Care has been taken to introduce the statistical models used to deal with the heterogeneities responsible for scattering.     

Reduced complexity strategies for modelling urban floodplain inundation

Significant advances in flood inundation modelling have been made in the last decade through the use of a new generation of 2D hydraulic numerical models. These offer the potential to predict the local pattern and timing of flood depth and velocity, enabling informed flood risk zoning and improved emergency planning. With the availability of high resolution DEMs derived from airborne lidar, these models can theoretically now be routinely parameterized to represent considerable topographic complexity, even in urban areas where the potential exists to represent flows at the scale of individual buildings. Currently, however, computational constraints on conventional finite element and volume codes typically require model discretization at scales well below those achievable with lidar and are thus unable to make optimal use of this emerging data stream.In this paper we review two strategies that attempt to address this mismatch between model and data resolution in an effort to improve urban flood forecasts. The first of these strives for a solution by simplifying the mathematical formulation of the numerical model by using a computationally efficient 2D raster storage cell approach coupled to a 1D channel model. This parsimonious model structure enables simulations over large model domains offering the opportunity to employ a topographic discretization strategy which explicitly represents the built environment. The second approach seeks to further reduce the computational overhead of this raster method by employing a subgrid parameterization to represent the effect of buildings and micro-relief on flow pathways and floodplain storage. This multi-scale methodology enables highly efficient model applications at coarse spatial resolutions while retaining information about the complex geometry of the built environment.These two strategies are evaluated through numerical experiments designed to reconstruct a flood in the small town of Linton in southern England, which occurred in response to a 1 in 250 year rainfall event in October 2001. Results from both approaches are encouraging, with the spatial pattern of inundation and flood wave propagation matching observations well. Both show significant advantages over a coarse resolution model without subgrid parameterisation, particularly in terms of their ability to reproduce both hydrograph and inundation depth measurements simultaneously, without need for recalibration. The subgrid parameterization is shown to achieve this without contributing significant computational complexity and reduces model run-times by an order of magnitude.     

三维可视化技术在锡铁山矿区信息化建设中的应用研究

运用Vulcan三维可视化软件,对锡铁山铅-锌矿区3062m中段以下05-75线之间的主要矿体进行三维可视化研究,全方位、真实地表达近年来的地质勘探成果,并通过储量计算与找矿预测,为下一步地质勘探工作提供科学依据,为矿区信息化建设提供基础资料。