Seismic rehabilitation and analysis of Chaohe earth dam

Stability of earth dams during earthquakes has been a major concern for geotechnical engineers in seismic active regions. Liquefaction induced slope failure occurred at the upstream slope of a major earth dam in the suburb of Beijing, China, during the 1976 Tangshan Earthquake. The gravelly soil with loose initial condition liquefied under relatively small ground vibration. In recent years, a major seismic rehabilitation project was carried out on a similar earth dam nearby using dumped quarry stone. Seismic stability analysis was carried out using model test, finite element simulation, and pseudo-static slope stability program after taking into account the influence of excess pore pressure.     

我国城市群经济整合的理论分析

区域发展历程表明,城市群逐渐成长为区域经济增长极,但经济不整合制约了城市群的进一步发展。基于区域经济发展和城市群发展视角,从经济全球化、区域经济发展、区域分工与合作、城市群内部的产业集聚与扩散、城市群内部的企业扩张和网络化组织的促进作用等方面阐述城市群经济整合的必要性。从城市群经济系统整合、城市群经济支撑系统整合和城市群区域协调机制建设等方面论述城市群经济整合的主要内容。     

河南省城市-区域系统空间发展态势与布局优化

城市-区域系统的空间结构布局与城市、区域的协同发展密不可分,城市-区域系统空间结构的整合与优化是城市区域化、区域城市化进程必须要解决的重大战略性问题。目前,河南省着力建设中原经济区,选择合适的空间优化模式与优化战略对其发展尤为重要。基于成长能力评价模型的城市空间发展态势,结合城市相互作用的基本方式,提出了河南省城市-区域系统空间布局优化的"三圈、一廊道、四轴带、双核、多边形组团、五协调区、一经济区"模式,并由此提出其空间优化的战略选择。     

2011年西北太平洋热带气旋预报精度评定

本文对2011年西北太平洋热带气旋(TC)业务定位和预报精度进行评定,内容包括TC定位、确定性路径和强度预报以及路径集合预报。结果表明:业务定位总平均误差为24.9 km;国内各综合预报方法24、48和72 h的总体平均距离误差分别为112.6、209.7和333.6 km;国内各业务数值模式24、48和72 h预报的总体平均距离误差分别为121.4、220.1和380.5 km,均比2010年有所减小,但各模式的强度预报能力仍不如客观预报方法。对7个集合预报系统的TC路径预报能力进行评估,发现ECMWF集合预报系统的整体表现最好,其次是NCEP集合预报系统,这两个系统在某些时效的集合平均预报接近或超过综合预报水平。国家气象中心集合预报系统处中游水平。     

NUMERICAL SIMULATION ON RE-INTENSIFICATION OF TROPICAL REMNANT RE-ENTERING THE SEA: A CASE STUDY

When Typhoon Toraji(2001)reached the Bohai Gulf during 1-2 August 2001,a heavy rainfall event occurred over Shandong province in China along the gulf.The Advanced Research version of the Weather Research and Forecast(WRF-ARW)model was used to explore possible effects of environmental factors,including effects of moisture transportation,upper-level trough interaction with potential vorticity anomalies,tropical cyclone(TC)remnant circulation,and TC boundary-layer process on the re-intensification of Typhoon Toraji,which re-entered the Bohai Gulf after having made a landfall.The National Centers for Environmental Prediction(NCEP)global final(FNL)analysis provided both the initial and lateral boundary conditions for the WRF-ARW model.The model was initialized at 1200 UTC on 31 July and integrated until 1200 UTC on 3 August 2001,during which Toraji remnant experienced the extratropical transition and re-intensification.Five numerical experiments were performed in this study,including one control and four sensitivity experiments.In the control experiment,the simulated typhoon had a track and intensity change similar to those observed.The results from three sensitivity experiments showed that the moisture transfer by a southwesterly lower-level jet,a low vortex to the northeast of China,and the presence of Typhoon Toraji all played important roles in simulated heavy rainfall over Shandong and remnant re-intensification over the sea,which are consistent with the observation.One of the tests illustrated that the local boundary layer forcing played a secondary role in the TC intensity change over the sea.     

鄱阳湖国家级自然保护区2007-2009年越冬期水鸟数量与分布

2007-2009年2个越冬期,在鄱阳湖国家级自然保护区9个湖泊共记录到水鸟61种,其中国家Ⅰ级保护鸟类4种,Ⅱ级保护鸟类8种,省级保护鸟类30种。2007-2008年和2008-2009年越冬期水鸟的最高数量均在12月出现,分别约为17.8万只和23万只。对2个越冬期水鸟在9个湖泊的分布情况进行分析,结果表明大湖池、沙湖、蚌湖和大汊湖是水鸟重要的栖息地。     

对气象短信的编写及其难点分析的探讨

通过列举大量的例子,从气象短信的语言风格、素材积累、难点分析以及用词技巧等方面对如何才能编写好气象短信作了粗浅的探讨,并提出自己的见解.     

基于GIS的电话号线系统图形管理模式研究与应用

在已有的MIS系统中添加GIS功能一直是GIS技术发展中备受关注的课题 ,本文主要研究在传统的号线MIS系统中增加GIS功能的方法———创建电子地图 ,其中实现的关键是图形系统与MIS系统的功能交互。文中以南京六朝号线系统为例对该方法的实现过程进行了详细的论述 ,包括体系结构 ,技术路线 ,功能框架等。GIS的强大的地图显示和查询功能与号线线路的自身特点相结合 ,应用于南京六朝号线管理系统中 ,取得了良好的社会效益。     

硫化物中微量元素测试方法的比较

从上世纪八十年代电感耦合等离子体质谱技术问世以来,ICP-MS就以它灵敏度高,干扰较少,具有多元素分析能力等特点迅速发展起来,广泛应用于地质、环境、冶金、生物、医学与工业等领域,成为最具有冲击力的分析技术.