CorelDRAW中专题地图符号的制作与管理

本文简要介绍了CorelDRAW的符号功能在编制各种专题地图中的应用.重点阐述了专题地图中点状、面状及方向线性符号的制作,以及在CorelDraw中点状专题地图符号库的管理.     

基于DEM的南京市彩色晕渲地图的研制

分析了基于DEM数据的自动晕渲地图生成的意义,介绍了将1:5万数据库中等高线文件转换到CartoShading软件中,利用软件本身功能生成晕渲的方法.     

Paleoenvironmental implications of the guano phosphatic cementation on Dongdao Island in the South China Sea

The phosphatic cement in the bioclastic sediment sequence on the northeastern shore of Dongdao Island in the South China Sea was studied and its paleoenvironmental implications discussed. Petrological characteristics and major, trace, REE element data unequivocally supported the notion that phosphatization was closely associated with avian guano decomposition and leaching, whereas carbon and oxygen isotope results further revealed that meteoric water were involved in these processes. AMS ¹⁴C dates on the brown phosphate cements indicate that they were formed around 5700, 5000–5100 and 2900 yr BP, respectively. The multi-episodes of phosphatization very likely correspond to intermittent seabird occupation on this island — possibly reflecting Holocene sea-level oscillation and/or long term climate changes in the South China Sea that have controlled seabird habitat. The phosphate cementation, which occurs widely in tropical islands, may be another useful monitor for sea-level and/or paleoclimate changes.     

The role of horizontal impulses of the faulting continental slope in generating the 26 December 2004 tsunami

For a long time, people have believed that the vertical displacement of seafloor due to undersea earthquakes is the primary cause of tsunami genesis. However, seismically-inverted seafloor deformation of the 2004 Sumatra–Andaman earthquake shows that the total vertical displacement is not enough to have generated the powerful Indian Ocean tsunami. Based on the seismically-inverted data and a three-dimensional ocean general circulation model (OGCM), we show that the momentum force, transferred by the horizontal impulses of the faulting continental slope in that earthquake, has accounted for two thirds of the satellite-observed tsunami height and generated kinetic energy 5 times larger than the potential energy due to the vertical displacement. The asymmetric tsunami pattern, recorded by tide-gauges showing leading-elevation waves toward Sri Lanka and leading-depression waves toward Thailand, is best explained by the horizontally-forced mechanism. The same mechanism has also explained the March 2005 Nias earthquake and tsunami data, suggesting that the horizontal motions of faulting have played more important roles in tsunami genesis than previously thought.     

Detection of nighttime sea fog/stratus over the Huanghai Sea using MTSAT-1R IR data

A dual channel difference (DCD) method is applied to detect nighttime sea fog/stratus over the Huanghai Sea using the infrared (IR) data of shortwave (3.5–4.0 μm) and longwave (10.3–11.3 μm) channels from the Multi-functional Transport Satellite (MTSAT)-1R, i.e., shortwave minus longwave brightness temperature difference (SLTD). Twenty-four sea fog events over the Huanghai Sea during March to July of 2006 and 2007 are chosen to determine a suitable value of SLTD for nighttime sea fog/stratus detection, and ...     

福建砂质海岸侵蚀原因和防护对策研究

本文通过对福建沿海砂质海岸侵蚀的调查,对福建砂质海岸侵蚀后退日趋严重现象进行了分析,针对福建不同岸段海滩的侵蚀特点,在地域上按侵蚀强弱划分为4个区域,并对各区侵蚀现象特点进行总结并分析原因,在此基础上提出一些海岸侵蚀的防治措施和建议.     

基于Multisim X的计算机辅助电子电路设计

学好<电子线路>这门课程,不仪需要有扎实的电路分析和信号与系统等专业基础知识,还需要在学习过程中加入单元或系统电路的实验环节,这样才能完成整个电路的设计.介绍如何在电路的理论没计基础之上,以Multisim X这一仿真软件为实验平台,仿照硬件环境来完成电路的最终设计的.     

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大气能见度研究

回顾总结了国内外有关大气能见度的理论研究、仪器观测和数值模拟方面取得的成果;介绍大气能见度研究的基本理论、消光系数的概念及计算方法;总结了几种白天大气能见度探测仪的使用原理及优缺点;介绍测量夜间大气能见度和数字摄像法探测大气能见度的方法;并着重介绍4种计算与雾有关的大气能见度的经验公式,基于2004年4月11日黄海海雾个例的RAMS模式数值模拟结果,采用4种方法分别计算了大气能见度的分布并进行了比较。总结出大气能见度研究中存在的问题和今后研究的主要方向,并针对其中仍然存在的问题提出一些建议。     

基于FVCOM的辽东湾潮汐潮流数值模拟

本文基于有限体积海洋数值模式FVCOM,对辽东湾潮汐潮流进行数值模拟,得到了辽东湾的最大可能流速分布以及M2、S2、K1、O1分潮的潮流椭圆分布和潮致余流分布等,计算结果与实测资料符合较好。结果显示,辽东湾潮汐类型为不规则半日潮,潮流类型为规则半日潮流;最大可能流速的分布受水深和岸线等因素的影响,辽河口东侧最大可能流速达140cm/s;辽东湾顶部余流速度较大,在盖州滩以东水道M2分潮潮致余流最大流速达9cm/s,在盖州滩东南侧存在1个逆时针的余流涡,是控制辽河口径流携沙分布的重要动力要素。