中国亚热带北界及其过渡带

本文根据亚热带热量指标构造了热量综合指数表达式,确定亚热带北界的具体位置、宽度和特征,分析过渡带内气候变量在时间上和空间上的内在联系。     

苏门答腊地震百年排名第四

美国地质勘探局测定2004年12月26日在印度尼西亚苏门答腊岛北端海岸几公里处发生的大地震为9．0级，这个震级在1900年以来世界发生的大型地震中排名并列第四。     

基于WebGIS的旅游景区空间智能评价系统研究

针对现有信息系统在空间智能评价方面的薄弱之处,运用WebGIS空间智能集成方法探讨旅游景区空间智能评价系统的设计和实现,从三方面提高了旅游景区评价系统的智能化层次:通过集成旅游景区网上调查问卷系统,提高了数据收集提取的智能化层次;通过集成旅游景区模糊综合评价模型、客流结构评价模型及旅游专家知识系统,增强了评价系统的半结构化智能推理功能;采用B/S C/S系统构架,并利用Web技术提高了人机交互界面的智能化。周庄景区案例评价结果显示,该系统原型的运行效果良好且智能化层次较高。     

河北平原地下水开发中的问题及可持续利用

河北平原是我国严重缺水地区，但在地下水开发过程中，引起了多种环境问题，如地下水位持续下降；地下水位降落漏斗不断扩大，地下含水层疏干；地面发生沉降及出现地裂缝；海、咸水入侵等等。作者从水资源、环境和社会经济的特点出发，提出实现水资源和社会经济可持续发展的对策：全面实施节水战略，努力实现工业、农业、居民生活、生态环境的高效用水，逐步建立起节水型社会；提高城市污水资源化利用率；利用海水、咸水、减少淡水用量；实施跨流域调水；保护水资源和改善水环境是缓解河北平原缺水和环境问题的重要措施。     

陕北一次秋季连阴雨过程的天气动力学分析

利用常规气象观测资料,对2008年12月20日-22日运城出现的寒潮大风天气过程,从高空、地面天气形势以及物理量场进行了综合分析。结果表明：本次寒潮属于贝湖横槽迅速转竖型,冷高压及冷锋迅速南下,导致寒潮爆发。物理量场上,横槽前有正涡度中心和强烈的上升运动,槽后负涡度及强烈的下沉运动使得横槽迅速转竖;自下而上强的垂直风切变,使得高空风动量下传,巨大的水平气压梯度和变压差,引起地面大风。     

不同性质降水发生前退偏振比的激光雷达探测

利用微脉冲偏振激光雷达对三次不同降水性质的云在降水发生前的退偏系数进行探测,对照分析同步观测的多普勒天气雷达垂直剖面图,结果表明激光雷达对云的退偏振比探测具有较高的可靠性,三次降水过程的退偏振比峰值随降水时间的逼近从高层逐步下降,退偏振比大于0.2的峰值一般出现在5 km以上的高层,2～6 km的退偏振比多维持在0.1～0.15之间,2 km以下退偏振比都小于0.1,且始终没有明显变化.     

Modeling large-scale instabilities in the Kuroshio extension

Large-scale instabilities of mid-latitude jets (with continuous horizontal and vertical shear) are studied using a long wave approximation, which is valid for disturbances of length scales greater than the internal Rossby radius of deformation. These large-scale instabilities are abundant in the Kuroshio Extension according to observations. Results show westward propagation if the total transport is westward (although the jet near surface is eastward). Large-scale instabilities gain energy from the release of available potential energy, but lose part of the gain to the mean flow by reinforcing the eastward jet near surface. The Reynolds stress tends to be positive north of the jet and negative south of the jet through all depths, which is consistent with observations.     

Characterization of drying-induced deformation behaviour of Opalinus Clay and tuff in no-stress regime

The drying-induced deformation behaviour of Opalinus Clay and tuff, which are being investigated under international and local collaborative projects for nuclear waste disposal in Switzerland and Japan, was investigated under a no-stress condition in the laboratory to evaluate their generic susceptibility to the formation of excavation damaged zone. The cylindrical core samples of Opalinus Clay and tuff were prepared to a one-dimensional drying condition and submitted to an uncontrolled laboratory environment. The strain evolution, evaporative water loss and environmental entities, such as temperature and relative humidity, were recorded simultaneously and quasi-continuously. It was observed that the drying phase induced significant strain magnitude and damage in Opalinus Clay samples, which was evidenced by the formation of hairy cracks on the surface parallel to the bedding. On the contrary, the strain occurrences in tuff samples were relatively insignificant, and no tendency of cracking was observed. In addition, the quasi-continuous availability of volumetric strains was further used in poroelastic relation for the estimation of capillary suction evolution. The calculated results were validated with pore size distributions obtained from mercury intrusion porosimetry.     

在VB6.0环境下实现自动成柱状图

介绍了利用ADO技术访问数据库，同时对VB调用Windows API方面进行阐述。通过两者结合来实现钻孔自动成图，从而大大地提高野外工作效率。