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计算机辅助地形分析系统在卫勤保障中的应用
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作者 杜江 陆守凯 《地理空间信息》 2017年第5期101-102,共2页
根据卫勤分队山地作战的实际情况,阐述了计算机辅助地形分析系统的特点。该系统能快速提供实时地形保障、优选行动路线、地形图调制、标图等功能,提高了卫勤保障部队生存能力,为战场预测、辅助决策提供了地形依据。
关键词 计算机辅助地形分析系统 卫勤机动 山地作战
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角膜曲率计浅析(上) 被引量:3
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作者 王英丽 《中国眼镜科技杂志》 2016年第21期136-137,共2页
1角膜及其形态测量简介 1.1角膜的结构及特征 角膜具有中央接近球形而向周边逐渐平坦的光学结构特征。根据Gullstrand模型眼,角膜前表面中心曲率半径为7.8mm,后表面中央曲率半径为6.8mm,折射率为1.367,等效角膜屈光里为43.05D,折合... 1角膜及其形态测量简介 1.1角膜的结构及特征 角膜具有中央接近球形而向周边逐渐平坦的光学结构特征。根据Gullstrand模型眼,角膜前表面中心曲率半径为7.8mm,后表面中央曲率半径为6.8mm,折射率为1.367,等效角膜屈光里为43.05D,折合眼睛总屈光力为2/3。角膜的表面具有非球面性,非球面是指中心到周边的曲率存在差异性变化,角膜的子午线截痕形态呈椭圆形,一般为长椭圆形(prolate),即角膜顶点曲率最大或曲率半径最短, 展开更多
关键词 角膜曲率计 角膜顶 屈光力 模型眼 非球面 曲率半径 角膜形态 形态测量 角膜接触镜 地形分析系统
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Stability analysis and monitoring study of Jijia River landslide based on WebGIS
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作者 LI XJao-gen WANG An-ming WANG Zong-min 《Journal of Coal Science & Engineering(China)》 2010年第1期41-46,共6页
On the basis of in situ investigation and deformation monitoring of the Jijia River landslide (JJRL), the rigid body limit equilibrium method and finite element method (FEM) were used to analyze the stability of t... On the basis of in situ investigation and deformation monitoring of the Jijia River landslide (JJRL), the rigid body limit equilibrium method and finite element method (FEM) were used to analyze the stability of the JJRL; the grey system theory method was applied to forecast the deformation trend of the JJRL; and the information system about the landslide deformation and monitoring, and forecasting systems based on the platform of the Web Geographical Information System (WebGIS) were developed, which can be used to analyze in situ monitoring data and predict the deformation of the landslide. The study results can be summarized as follows: (1) the JJRL is stable as a whole; the water content in the landslide has a great effect on its stability; (2) the developed Web Geographical Information System has realized many functions, including inputting, computing, inquiry, analyzing, and the function of forecasting; it has also realized the functions of distance data management, analysis, and forecasting based on the WebGIS; (3) the information resource can be shared by the WebGIS developed all over the world. 展开更多
关键词 LANDSLIDE stability WEBGIS rigid body limit equilibrium method finite element method(FEM)
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数字测图成果的三维可视化及其空间分析 被引量:3
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作者 蒋健君 花向红 +1 位作者 夏真 冯健 《测绘地理信息》 2013年第4期24-26,共3页
介绍二维地形图到三维地形图的转化方法,以武汉大学大花岭实习基地部分测量成果为基础,给出了利用ArcGIS和SketchUp结合实现数字测图成果的三维可视化方法和步骤。在C#开发环境下,利用SceneControl控件开发了三维地形空间分析系统,实现... 介绍二维地形图到三维地形图的转化方法,以武汉大学大花岭实习基地部分测量成果为基础,给出了利用ArcGIS和SketchUp结合实现数字测图成果的三维可视化方法和步骤。在C#开发环境下,利用SceneControl控件开发了三维地形空间分析系统,实现了属性查询、空间量算等功能。 展开更多
关键词 数字测图成果 三维可视化 SKETCHUP ARCGIS 三维地形空间分析系统
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COMPLEX SYSTEM ANALYSIS OF MARKET RETURN PERCOLATION MODEL ON SIERPINSKI CARPET LATTICE FRACTAL
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作者 DONG Yanfang WANG Jun 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2014年第4期743-759,共17页
This paper investigates the statistical behaviors of fluctuations of price changes in a stock market.The Sierpinski carpet lattice fractal and the percolation system are applied to develop a new random stock price for... This paper investigates the statistical behaviors of fluctuations of price changes in a stock market.The Sierpinski carpet lattice fractal and the percolation system are applied to develop a new random stock price for the financial market.The Sierpinski carpet is an infinitely ramified fractal and the percolation theory is usually used to describe the behavior of connected clusters in a random graph.The authors investigate and analyze the statistical behaviors of returns of the price model by some analysis methods,including multifractal analysis,autocorrelation analysis,scaled return interval analysis.Moreover,the authors consider the daily returns of Shanghai Stock Exchange Composite Index,and the comparisons of return behaviors between the actual data and the simulation data are exhibited. 展开更多
关键词 PERCOLATION RETURN Sierpinski carpet lattice fractal statistical analysis stock market.
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