大理北衙斑岩型金矿地质特征及成矿条件研究

北衙金矿位于大理州鹤庆县北衙乡,为哀牢山。一金砂江富碱侵入岩带的组成部分。金矿在时、空分布及成因上都与燕山晚期。喜山期富碱斑岩密切相关。金矿体按产出特征可以分为四种类型,即受接触带控制的矿体、受构造破碎带控制的矿体、受层间裂隙控制的矿体和受岩相古地理控制的古风化壳矿体。原生矿体主要形成于中温热液阶段,黄铁矿等为主要载金矿物。矿区独特的地质条件使氧化带深度可达400米,矿体遭受强烈表生氧化并形成金的次生富集。金主要来源于岩浆热液,具有深源浅成的特点。     

云浮硫铁矿露天采场边坡治理

云浮硫铁矿露天采场,由于存在不利于边坡稳定的地质因素,因而有针对性地采取了边坡治理措施:削坡治理滑坡;毛石浆砌或干砌支护边坡;牙轮钻在将形成坡面的上一平台钻抗滑排桩支护边坡;砂浆直接抹面或挂网抹面护坡,以及人工种植护坡等。     

Implementation of computing standards

The F-16 avionics implements what is likely the broadest application of standards of any USAF weapon system. Standards available in 1976 were applied which consisted of the MIL-STD-1553 Multiplex Data Bus, JOVIAL J3B which was the defacto software and precursor to JOVIAL J73 dialect and the MIL-STD-490 software documentation standard. These standards were instrumental in making the F-16 a very successful program. The F-16 avionic system is now being greatly expanded to accommodate advanced sensors and weapons currently in USAF funded development. Once again the F-16 is at the forefront in implementing the latest USAF standards. A key feature of the enhanced avionics is the application of JOVIAL J73 (MIL-STD-1589B) for all subsystems, the MIL-STD-1553B Multiplex Data Bus, the MIL-STD-1750A Computer Instruction Set Architecture, and the MIL-STD-1760 Stores Interface. Both the implementation of standards in the current F-16 avionics and also in the enhanced F-16 avionics now in development are described.     

Slope stability analyses on a low-cost microcomputer

A slope stability program for use on a low-cost microcomputer is described. The program is general in that it includes circular and noncircular slip surface analyses, different soil strata, a watertable, and external loading. The graphics facilities available on the machine are used extensively to produce an interactive program which is easy to understand and run.     

HDM: A Client/Server/Engine Architecture for Real-Time Web Usage Mining

The behavior of the users of a website may change so quickly that it becomes a real challenge to attempt to make predictions according to the frequent patterns coming from the analysis of an access log file. In order to reduce the obsolescence of behavioral patterns as much as possible, the ideal method would provide frequent patterns in real time, making the result immediately available. In this paper, we propose a method for finding frequent behavioral patterns in real time, whatever the number of connected users. Considering how fast frequent behavior patterns may have changed since the time the access log file was analyzed, this result thus provides completely appropriate navigation schemata for predicting user behavior. Based on a distributed heuristic, our method also tackles and provides answers to several problems within the framework of data mining: the discovery of interesting zones (a large number of frequent patterns concentrated over a period of time, or super-frequent patterns), discovering very long sequential patterns and interactive data mining (on-the-fly modification of the minimum support).     

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为系统认识西湖凹陷浙东中央背斜带的油气分布规律,优化勘探目标选择,推进油气勘探与开发进程,应用含油气系统理论和量模拟技术,对组成浙东中央背斜带油气系统的基本地质要素与成藏作用过程进行了综合分析。研究表明,始新统平湖组泥岩与煤层为该区主力烃源岩,具较高有机质丰度与生、排烃强度;浙新统花洪组砂质岩是最重要的储集岩;花港组上段泥岩为区域性盖层;圈闭发育与油气生、排、运聚的配置关系良好,是烃类聚集的理想场所;该区存在４个含油气系统,多属天然气系统,其中中平湖组一花港组系统为最主要的含油气系统,其油气生成聚集效率高,是本区目前主要的油气勘探对象,整体上,浙东中央背斜带具良好的含油气系统形成的地质要素和较为复杂的成藏作用过程,具有备形成大、中型气田的基本油气地质条件,具有广阔的天然气勘探前景。     

Simplified Procedure for Estimating Earthquake-Induced Deviatoric Slope Displacements

A simplified semiempirical predictive relationship for estimating permanent displacements due to earthquake-induced deviatoric deformations is presented. It utilizes a nonlinear fully coupled stick-slip sliding block model to capture the dynamic performance of an earth dam, natural slope, compacted earth fill, or municipal solid-waste landfill. The primary source of uncertainty in assessing the likely performance of an earth/waste system during an earthquake is the input ground motion. Hence, a comprehensive database containing 688 recorded ground motions is used to compute seismic displacements. A seismic displacement model is developed that captures the primary influence of the system’s yield coefficient (ky), its initial fundamental period (Ts), and the ground motion’s spectral acceleration at a degraded period equal to 1.5Ts. The model separates the probability of “zero” displacement (i.e., ? 1?cm) occurring from the distribution of “nonzero” displacement, so that very low values of calculated displacement do not bias the results. The use of the seismic displacement model is validated through reexamination of 16 case histories of earth dam and solid-waste landfill performance. The proposed model can be implemented rigorously within a fully probabilistic framework or used deterministically to evaluate seismic displacement potential.     

台州经济开发区滨海工业区块的排涝问题与治理对策

东海滨海地区新围海造地的滩涂,由于其地理位置优越,土地价格便宜,是开发建设滨海工业的理想区域.但这些区域现有河网格局及排水口门的规模往往不能适应开发建设用地的标准和要求,防洪排涝能力严重不足,矛盾严重.今针对台州滨海工业区块内存在的问题,在流域背景下提出治理措施.     

小浪底库区坡地不同利用方式入渗规律与产流产沙特征研究

坡耕地水土流失已成为小浪底库区生态环境和农业可持续性发展所面临的一个重大问题。通过饱和入渗和模拟降雨试验,对不同退耕利用方式(撂荒坡地、造林幼林地、林草间作、农林间作)和传统坡耕地利用方式(坡耕地翻耕休闲、坡耕地翻耕后种植玉米)入渗规律与产流、产沙特征做了研究。结果表明:(1)退耕后坡面饱和入渗率均高于传统方式,其四种方式平均饱和入渗率是传统利用方式的1.48倍;撂荒坡地的饱和入渗率最高;同一坡面,坡底饱和入渗率高于坡中、上部。(2)初始产流时间,撂荒坡地、造林幼林地、林草间作、农林间作分别比翻耕种玉米延迟26.16min、14.89min、13.48min、6.01min,两种传统方式差别不大。持续产流时间退耕方式也长于传统方式。(3)传统方式径流总量是上述四种退耕方式的2~5倍,平均产流速率明显高于退耕方式;产沙总量是退耕方式的3~50倍左右,平均产沙速度是其的1.72~9.4倍;产沙、产流总量和与产流降雨历时密切相关。