Design of environmental decision support system and its application to water quality management

1 IntroductionEnvironmental decision support systems could be divided into two categories by their organizational form and system functions. One is regional environmental analytical system based on commercial GIS and assisted by environmental models, such as BASINS developed by the American NEPA using ARC/VIEW as its user platform and including QUAL2E and NPSM as its prediction tools. The other is environmental information and prediction system based on mathematical models, such as…     

“十五”期间我省地震分析预报数据库建设展望

本文阐述了地震分析预报数据库在地震中短期预报系统中的重要性 ,同时具体提出建立该数据库系统所用的方法和技术途径 ,并给出预期的成果。另外 ,本文还介绍了建立该数据库系统的有利条件极其存在的困难 ,并对解决困难提出了建议。     

Recent applications of sliding block theory to geotechnical design

The sliding block theory was proposed by Newmark for determining the permanent displacement of embankments and dams under earthquake loading. This paper highlights recent applications of sliding block theory to different geotechnical structures. The equations to determine seismic factor of safety, yield acceleration and permanent displacement are given for rock block, soil slope, landfill cover, geosynthetic-reinforced soil retaining wall, and composite breakwater. The presented equations for seismic stability degenerate to that of static stability in the absence of earthquake. The permanent displacement for various structures can be obtained from that of a horizontal sliding block through a correction factor. A simplified procedure is included for the permanent displacement under vertical acceleration. The sliding block approach is rational for design under high seismic load.     

Post-earthquake investigation on several geosynthetic-reinforced soil retaining walls and slopes during the Ji-Ji earthquake of Taiwan

This paper gives an overview on the application of geosynthetic-reinforced soil structures in Taiwan. Taiwan has an unique topography and geotechnical conditions that rendered a less conservative and more challenging design compared to that of North America, Europe and Japan. The Ji-Ji (Chi-Chi) earthquake of 1999 gave an opportunity to examine the behavior of reinforced soil structures. The performance of several modular-block reinforced soil retaining walls and reinforced slopes at the vicinity of the fault was evaluated. Reinforced structures performed better than unreinforced soil retaining walls. The failure cases were highlighted and the cause of failure was identified. The lack of seismic design consideration could be a major cause of failure. The compound failure mode, the inertia force of the blocks, and the connection stiffness and strength relative to the large dynamic earth pressure, were among major items that would warrant further design consideration.     

水稻本田期冠层叶色变化节奏的光谱监测

以Ｅｘｏｔｅｃｈ１００ＢＸ光谱辐射计对不同类型水稻材料无肥处理本田期的监测结果表明，晚熟类型材料武育粳２号，冠层叶色显示出“三黑三黄”的变化节奏。“三黑”出现的时间是：移栽至分蘖末期，枝梗分化期至颖花分化期，花粉母细胞形成及减数分裂期至始穗期；“三黄”出现的时间是：分蘖末期至枝梗分化期，颖花分化期至花粉母细胞形成及减数分裂期，始穗至灌浆期。中熟类型材料汕优６３，冠层叶色显示出“二黑二黄”的变化节奏。“二黑”出现的时间是：移栽至颖花分化期，花粉母细胞形成及减数分裂期至始穗期：“二黄”出现的时间是：颖花分化期至花粉母细胞形成及减数分裂期，始穗至灌浆期。早熟类型材料亚优２号，冠层叶色显示出“一黑一黄”的变化节奏。“一黑”出现的时间是：移栽至颖花分化期；“一黄”出现的时间是：颖花分化期至灌浆期。     

广州市土地资源的保护和可持续利用研究

本文分析了广州市土地利用的结构及其变化趋势，指出土地利用上存在的主要问题和隐患 为采取有效措施，加强对耕地和环境的保护，以保证土地资源的可持续利用。     

东海陆架平湖海域改造砂沉积特征

东海陆架平湖海域分布的改造砂。其物质来源为晚更新世末生成的沙脊物质,是在晚更新世末至全新世初期间,原始物质被掀起再沉积的产物。     

Nd, Sr and O Isotopic Study on Spilite-Keratophyre in Xiqiu,,Zhejiang Province, China

Nd, Sr and O isotopic study on the spilite-keratophyre sequence in Xiqiu shows that its ∈_(Nd) values are inthe range of 4.02-5.26, and its ∈_(Sr) values, +1.4-2.6. According to the points of these data in the ∈_(Nd)-T,∈_(Sr)-T and ∈_(Nd)-∈_(Sr) diagrams, the spilite-keratophyre is interpreted as being slightly contaminated by crustalmaterials. Its δ~(18)O values are 3.9-5.0‰. The depletion of ~(18)O in the rocks resulted from the influence ofseawater hydrothermal alteration during or soon after the rock formation. Based on the isotopic characteristicsand available geochemical data, it is believed that the spilite-keratophyre was formed in the well-developedisland-arc environment during the Late Proterozoic subduction of the palaeo-Pacific plate beneath thesoutheastern margin of the Yangtze massif.     

用Autolisp绘制高精度坐标方格网

通过对AutoCAD填充图案ANSI37的巧用,来完成任意图幅、任意转角的高精度坐标方格网的绘制,同时完成网格线的标注,内图廓、外图廓及图签的绘制,为机助制图提供了一种高精度、快速绘制坐标方格网的好方法。     

发展“三高”果业需重视大生态系统的耗散协调性──剖析龙泉花果山的大生态环境

发展高产优质高效果业，常会涉及到大生态系统的各类环境因子群。龙泉花果山的大生态系统主要是以风化岩体→紫色土容库→蜜桃等构成的向量大系统的综合反映，并呈现非均衡耗散结构的复杂协调性，这些因素直接制约“三高”果业的发展。