GIS中缓和曲线的不确定性模型

该文推导了缓和曲线上任意点坐标的方差的加权平均值,来建立描述曲线元不确定性的模型。给出了以缓和曲线法方向的中误差表示误差带宽的εσ模型,以及以最大方向误差表示带宽的εｍ模型的计算方法。通过实例说明了εｍ模型是理论上更加严密的缓和曲线误差模型,而εｍ模型是一种简化的描述模型。     

中震下RC框架结构的失效相关性分析

在定义框架结构截面效应的束维修失效的基础上,利用钢筋混凝土框架结构非线性随机模拟地震反应分析程序,研究了在役框架结构在中震作用下截面效应约束的失效相关性。通过分析,总结出了可用于可靠性分析的相关性规律,并通过算例示出了相关性规律在结构体系可靠度计算中的应用。     

江河堤坝垂直防渗高压喷射灌浆技术

１９９８年洪水过后,堤坝防渗工程量急剧增加,与此有关的各种技术方法大量应用。高压旋喷注浆是其中的技术方法之一。简述了目前国内用于堤坝防渗处理的各种技术方法的应用效果和不足,重点阐述了高压旋喷注浆技术在堤坝的渗加固中的应用情况、适用范围、防渗机理,技术参数、施工技术及质量检查方法等问题。     

BP网络在沉积环境自动识别中的应用

应用BP网络算法,实现了一个基于粒度数据的沉积环境自动识别系统。用它对几个地区不同沉积环境类型的现代沉积物样品进行了细致的粒度母体模式分类,并取得了良好的效果。      

Biomarkers and trace metals in the digestive gland of indigenous and transplanted mussels, Mytilus galloprovincialis, in Venice Lagoon, Italy.

The aim of this study was to investigate the cellular and biochemical response of mussels, Mytilus galloprovincialis, transplanted from a relatively pristine site to a polluted one and vice versa in the Lagoon of Venice (northeast of Italy) and to apply auto-metallography, a rapid and sensitive histochemical technique, to determine the bio-available fraction of heavy metals accumulated in the body tissues of organisms. Animal digestive glands have been used for morphological analyses (lysosomal volume, surface and numerical density, mean epithelial thickness, mean diverticular and luminar radius), autometallographical black silver deposits quantification and biochemical assays (superoxide dismutase and catalase activity). Furthermore, heavy metal content was determined by atomic absorption spectrophotometry (AAS) using standard procedures. The overall results indicate a direct influence of the environment in the thinning of the digestive cells and in the increasing number of lysosomes in mussels from the more polluted site. These data are in agreement with the metal content in digestive cell lysosomes as determined by autometallography, whereas AAS measurements show less significant differences.     

基于北斗导航的5G医疗废弃垃圾监测系统

医疗废弃垃圾因其具有高危、高污染等特点,一旦在公共场所泄漏,将造成巨大危害,所以医疗垃圾清理一直是政府和民众关注的重点.本文根据医疗垃圾废弃物运输的特点,设计了基于北斗导航的5G医疗废弃垃圾监测系统,保障了医疗垃圾从医院源头至指定医疗垃圾处理点的安全运输.能有效减少医疗垃圾废弃物的无序倾倒、医疗垃圾被二次回捡使用及非法买卖、医疗垃圾清运车长时间在人员密集公共场所停放的现象.     

基韦诺半岛与滇黔地区玄武岩铜矿对比研究

滇黔地区玄武岩铜矿有很长的找矿与开发历史,但矿床规模较小。有研究者认为其与美国基韦诺铜矿极具相似性,并认为加强区内地球化学边界及铜矿床研究,将对成矿理论发展及经济价值方面具有重要意义,此举引发了新一轮的研究与找矿热潮,但收效甚微。为探索滇黔地区找矿过程中所遇之困惑以及更进一步探明资源潜力,本文在详细了解基韦诺半岛铜矿特征基础上,展开了其与滇黔地区铜矿的相似性、差异性对比研究。认识到以往对基韦诺半岛铜矿特征描述存在偏差,基韦诺半岛铜矿与滇黔地区铜矿之间相似性与差异性共存,滇黔地区红层化作用不足可能影响了成矿规模,但可寻找地质环境有利矿种;提出玄武岩自然铜矿化可能潜力有限,三叠系砂岩型铜矿需要继续关注以及其他铜矿类型具有找矿价值较小或尚需研究的建议。     

贵州省镍钼钒多金属矿成矿地质特征及其控制因素

贵州省的镍钼钒多金属矿分为岩浆熔离型铜镍矿、热液型多金属矿床中的镍钼钒矿、沉积型镍钼钒矿和次生淋滤型镍钼矿等4种矿化类型。文章重点介绍了沉积型镍钼钒矿的成矿地质特征,分析了其成矿条件及找矿标志,探讨了黑色岩系底部镍钼钒多金属矿层的成因机理,提出了"白烟囱"型的成硅(磷)、成矿、生物爆发的形成机制和被动大陆边缘构造、岩相古地理、深部岩浆岩及断裂构造等控制因素。     

El Niño Modoki connection to extremely-low streamflow of the Paranaíba River in Brazil

Extremely-low discharge events of the Paranaíba River basin during the austral summer season (December–February, DJF), are found to be associated with the Pacific sea surface temperature anomalies resembling the recently identified El Niño Modoki phenomenon. Extreme discharge events are identified based on their persistent flow for 7 days and more after taking retention time into consideration. Ninety percent of the extremely low discharge events during peak streamflow seasons of DJF, are found to occur during the El Niño Modoki years. A diagnostics study of atmospheric anomalies has shown a clear connection between the modified Walker circulation, associated with the El Niño Modoki, and the precipitation anomalies over the Paranaíba River basin. The climate variations have direct relationship with the rainfall. Streamflow variations are considered as the surrogates to rainfalls. Thus, El Niño Modoki phase is important component to understand and predict the streamflow variations in the Paranaíba River basin.