Island instantaneous coastline extraction based on the characteristics of regional statistics of multispectral remote sensing image

本研究采用IkOnOS遥感图像,选取波谱特征区,通过区域像元统计并计算各波段权重系数,将影像进行波谱归一化处理,使归一化的影像岛陆与海水特征更明显。在此基础上,采用最大类间方差法确定最佳分割阈值,对归一化的影像进行二值化,从而提取海岛岸线。该方法采用特征曲线法进行水陆分离,得到的二值图像保持了原图的有效边缘,采用二值形态学提取的海岸线连续可靠、信噪比高。结果表明,该方法简单、快速,能有效提取海岸线,具有实用价值。This study adopted IKONOS remote sensing images and selected spectral characteristic areas, through regional pixel statistics and calculating weight coefficients of each band, processed the images with the spectral normalized method, which made the features of islands, land and water features more obviously in the images.On this basis, the OTUS was used to determine the optimal segmentation threshold, and the normalization image binarization was made, thus the island coastline was extracted.This method used the characteristic curve method to separate the land and water, obtained the binarization images and maintained the original edge effectively.The coastline that was extracted by Binary Morphology was continuous, reliable and high signal-to-noise ratio.The results showed that this method could extract the coastline fast, simply and effectively, which had the practical value

Analysis on the land use and cover change in Tianjin Binhai New Area based on the remote sensing

采用全国土地分类系统,基于lAndSAT卫星TM遥感影像与天津滨海新区1:50,000地形图,进行相应数据处理,编制出2000年、2005年、2010年三期滨海新区土地利用/覆盖分类图,并运用土地利用转移矩阵对近10年来天津滨海新区土地利用/覆盖变化进行定量分析。在此基础上,进一步分析了经济、人口等驱动因子对土地利用/土地覆盖的影响。结果表明:十年间,滨海新区的建筑用地面积增加显著,而绿地、湿地、滩涂等高生态价值的土地向建筑用地、未利用地等开发建设用地大幅度转化,后五年变化尤为显著。This paper carries out quantitative analysis on the land use/cover(LU/C) change of Tianjin Binhai New Area in recent 10 years through using land use transition matrix from the three-stage LU/C classification maps of 2000, 2005 and 2010 drafted by means of the National Land Classification System of China based on Landsat TM satellite remote sensing image and the Tianjin Binhai New Area 1:50 000 relief maps.On this basis, the impact of such driving factors as the economy and population on LU/C is further analyzed.The results show that the area of the building land in Binhai New Area has increased significantly over the ten years, and the greenland, wetland, and shoals of high ecological value have been dramatically transformed into the building land and unused land for the development and construction, and the change is more significant in the later five years

普乐可复防治大鼠抗肾小球基底膜肾炎的实验研究

观察普乐可复 (FK5 0 6 )防治大鼠抗肾小球基底膜 (GBM)肾炎的疗效。方法 :复制大鼠抗GBM肾炎模型。实验分 3组 :肾炎 +FK5 0 6组、肾炎对照组及正常对照组。大鼠一次性尾静脉注射抗GBM抗血清后 6h内皮下注射FK5 0 6注射液 (0 5mg·kg-1·d-1) ,至第 2 1d。对照组则给予等量的生理盐水。定期于第 4d、第 14d和第2 1d ,检测大鼠尿蛋白、血清肌酐和尿素氮水平 ,观察肾组织病理学改变 ,以及检测T淋巴细胞转化功能。结果 :肾炎对照组大鼠注射抗血清后于第 4d即出现异常蛋白尿 ,血清肌酐和尿素氮亦持续上升 ;肾小球内可见细胞数增加和新月体形成 ,肾小管内大量蛋白管型 ,GBM呈不规则增厚 ,足突大片融合 ;T淋巴细胞转化功能异常。而肾炎 +FK5 0 6组大鼠上述病变均明显较轻。结论 :FK5 0 6能够明显改善大鼠抗GBM肾炎的肾功能

饱和流动沸腾中孤立气泡行为的三维数值模拟

利用三维数值模拟,在垂直向上流动的条件下,对饱和核态沸腾中孤立气泡的成长与滑移过程进行了研究。模拟中,利用非稳态热传导模型考虑了加热固壁的瞬态热响应。结果显示,主体流动速度与固壁瞬态导热对气泡动力特性及传热特性有着较大影响

高炉炉顶水冷齿轮箱虚拟样机及力学特性分析

水冷齿轮箱是无料钟高炉炉顶设备的核心部件,其功能是驱动并控制布料溜槽旋转和倾动,以满足高炉不同的布料要求。以某高炉炉顶齿轮箱为研究对象,采用虚拟样机技术,开展高炉齿轮箱的动力学仿真研究。研究结果表明,水冷齿轮箱布料溜槽在高速旋转和低速旋转时溜槽外圈齿轮所受啮合力相对较小;当溜槽倾动运动时溜槽外圈齿轮所受的啮合力变得很大,其最大值是溜槽旋转运动时溜槽外圈齿轮所受啮合力的两倍,说明布料器在溜槽倾动运动时不是很稳定

光栅辅助的表面波传感器研究

采用严格耦合波方法研究了普通棱镜耦合的表面波传感器与光栅辅助的表面波传感器的传感特性.设计了工作在1550 nm处的一维光子晶体与光栅的材料参数与结构参数.光栅的深度为20 nm,周期为524.6 nm,占空比为0.5.模拟计算表明,光栅的引入导致双共振峰的出现,表面波的模式出现分裂.当外界折射率变化时,两个共振峰向相反的方向移动.利用双共振峰的这种特性进行传感,可以使光栅辅助表面波传感器的角度灵敏度提高到普通棱镜结构表面波传感器的3倍以上