GeoLOD软件平台下的三维地形模拟飞行系统的设计与实现

以深圳市龙岗区电子地图集项目中的三维地形模拟飞行模块为依托,介绍了GeoLOD控件及其相关原理,阐述了在Windows操作系统环境下,利用Visual C 和GeoLOD控件设计和实现三维地形模拟飞行系统的方法.     

高边坡稳定性评价、加固措施和监测分析

以某地高边坡为工程实例,根据高边坡的基本特征,分析了其发生局部变形的原因,并对稳定性进行定量评价。经分析最终采用刷坡卸载+微型钢管桩+排水系统+绿化综合治理方案。治理后通过检测和监测成果,得出注浆前后土体抗剪强度指标变化,在此基础上比较加固前后边坡稳定性变化,体现了信息化施工对边坡稳定性的印证,对今后治理类似高陡边坡时具有一定的借鉴作用。     

碳酸岩U系测年在滇西北北衙组地层抬升速率计算中的应用

自第四纪以来,滇西北地区地壳活动强度明显增强,地震活动频繁,区域稳定性越来越低,人类生存环境严酷。选取滇西北地区鹤庆—洱源断裂带经过的北衙组地层作为研究对象,通过对干涸的溶洞内鹅管碳酸盐矿物进行U系不平衡法准确定年,厘定出构造隆升作用的起始时间,最终计算得出该套地层抬升速率为2.4mm/a。北衙组地层的迅速抬升,反映了滇西北地区作为青藏高原东南扩展前缘的地球动力学过程,可能与青藏高原下地壳物质向滇西流动汇聚有关。同时,该抬升速率为滇西地区国家重大工程建设的设防抗震提供了可靠的数据支撑。     

基于空间模型的全球粮食安全评价

This paper presents a scenario-based assessment of global future food security. To do that,the socio-economic and climate change scenarios were defined for the future and were linked to an integrated modeling framework. The crop yields simulated by the GIS-based Environmental Policy Integrated Climate (EPIC) model and crop areas simulated by the crop choice decision model were combined to calculate the total food production and per capita food availability,which was used to represent the status of food availability and stability. The per capita Gross Domestic Product (GDP) simulated by IFPSIM model was used to reflect the situation of food accessibility and affordability. Based on these two indicators,the future food security status was assessed at a global scale over a period of approximately 20 years,starting from the year 2000. The results show that certain regions such as South Asia and most African countries will likely remain hotspots of food insecurity in the future as both the per capita food availability and the capacity of being able to import food will decrease between 2000 and 2020. Low food production associated with poverty is the determining factor to starvation in these regions,and more efforts are needed to combat hunger in terms of future actions. Other regions such as China,most Eastern European countries and most South American countries where there is an increase in per capita food availability or an increase in the capacity to import food between 2000 and 2020 might be able to improve their food security situation.     

轴向间隙对φ89 mm涡轮钻具性能的影响分析

涡轮钻具中涡轮定子、转子设置合理的轴向间隙,可以保证转动系自由转动,避免定转子相互碰撞而损坏。轴向间隙对钻具寿命非常重要,但是受零件加工误差和受压变形等因素干扰,定转子轴向间隙难以确定一个最优定值,只能处于一个范围内。为了分析验证轴向间隙对φ89 mm涡轮钻具的性能影响,采用理论分析和数值模拟计算相结合的论证方法,对效率和性能参数计算进行了理论分析,并采用计算流体力学软件对不同轴向间隙的单级φ89 mm涡轮性能进行数值模拟。分析结果表明,在合理范围内,轴向间隙变化对φ89 mm涡轮钻具性能影响细微,可以忽略。     

距离加权平均法数学模型在海河流域降雨等值线分析中的应用

将距离加权平均的数学模型算法引进到海河流域降雨等值线的分析计算中，并结合雨量站分布等具体问题对该模型做了一些改进，较好地解决了海河流域计算机自动分析、绘制降雨等值线的问题。     

浅谈内蒙古视频会商系统使用技巧

内蒙古视频会商系统自建设以来,在视频会商、视频会议、远程培训等方面得到广泛的应用。通过对视频会商系统几年来维护经验的积累,从视频软终端应用、录播服务器应用、DVB-S应急、矩阵的应用,声音控制经验等几个方面,阐述视频会商系统使用中的相关问题。     

镇坪县杨江河矿区钒矿地质特征及找矿远景

黑色岩系在陕南分布较广,其中含有钒、钼、硒、铀等矿.文中对杨江河矿区钒矿地质特征和找矿远景进行了总结和展望.