合理尺度纹理分析遥感影像分类方法研究

纹理分析是提高遥感影像分类精度的重要手段之一。纹理特征与地物类别尺度密切相关,应用纹理特征进行遥感影像分类, 关键在于纹理尺度的确定。对于灰度共生矩阵纹理分析来说,就是选择大小合适的纹理窗口。根据样本半变异值在较小范围内有较 大变化的特性,研究遥感影像相邻像素之间的空间关系,将半变异值开始趋于恒值时所对应的步长作为纹理分析的窗口大小,并在 纹理特征提取过程中针对每一个像素,在最大似然分类结果的约束下,适时改变其窗口大小,提取纹理特征,提出一种合理尺度纹 理分析的遥感影像分类方法。最后,选择北京市昌平区2006年SPOT 5遥感影像,利用TitanImage二次开发环境实现了该方法。实践 证明,该方法能有效提高遥感影像的分类精度。     

甘肃CZB型竖直摆倾斜仪观测数据震前异常分析

甘肃省CZB型竖直摆倾斜仪观测资料显示,形变异常与中国大陆近年具有较大影响的一些地震存在对应关系,分析发现震前异常变化有2种：①渐进式异常变化;②台阶式异常变化。研究发现,在不同地震台站,同种倾斜仪器在同一地震前异常表现不同,分析认为异常形态与台址岩性和岩石完整程度有关,与台站所处地质构造和周围山体地貌有关。     

Eco‐physiological repercussions of dietary arachidonic acid in cell membranes of active tissues of the Gray whale

The radiation of the mammalian land species that became the baleen whales happened about 27–34 Mya. Mammals require omega 6 fatty acids for reproduction. With this long exposure to the omega 3‐rich marine food chain, the Gray whale (Eschrichtius robustus) might be expected to have lost its requirement for omega 6 fatty acids. We report an unexpectedly high content of omega 6 arachidonic acid (ArA) in the Gray whale liver and muscle lipids. This whale migrates 10,000 km from the cold polar, omega 3 oil‐rich food chain to that of the breeding lagoons of the tropical waters. The food web of tropical waters is a source of omega 6 fatty acids, which are hardly present in the cold polar food web. We suggest the reason for this longest of migrations from cold to warm waters is to meet the requirement for omega 6 fatty acids for mammalian reproduction and brain growth. This extreme conservation of omega 6 fatty acids in Gray whale biology has critical implications for mammalian biology and especially for whale conservation.     

安阳夏玉米生长期气候要素与产量的灰色关联分析

采用灰色关联度分析了安阳夏玉米生育期间主要气象要素与夏玉米产量的关系，明确了当地夏玉米产量在年度间的差异主要以积温为主导因素，不同生育期中的气候因素以拔节-乳熟期的光照和降水量对产量影响最大，而乳熟-成熟的降水量对产量的影响程度最弱。     

老航片在考古中的应用研究

通过国家863计划项目“考古遥感与地球物理综合探测技术”和国家历史博物馆项目“周王陵历史变迁研究”的研究成果，介绍了老航片在考古研究中的应用方法和应用效果。     

地震前兆数据异常自动检测报警系统

通过对地震前兆数据的分析与研究,研制了一套地震前兆数据异常自动检测与报警系统.该系统可实现测项分量与检测方法的自由定制,通过利用相关分析、差分检测、固体潮相关检测、方差检测、台阶检测与金日光第四统计力学群子统计理论等多种检测方法,实现了对数据的自动异常检测与报警.试验证明,该系统有效可行,可为地震数据监测人员与地震预报...     

汶川地震前泰安台摆式倾斜仪异常现象分析

对泰安台水平摆和垂直摆倾斜仪长期观测资料进行了分析,通过对M2波潮汐因子变化和矢量图进动轨迹的分析发现,汶川地震前存在异常现象.     

基于水资源承载力的民勤绿洲土地利用结构优化研究

 采用灰色线性规划方法,基于水资源承载力对民勤绿洲土地利用结构优化进行了研究。研究结果表明: ①在水资源刚性约束的条件下,土地利用结构优化的方向是减少高耗水的水浇地,增加大棚用地、牧草地、灌木林地和工业用地。②提出了土地利用结构优化最优方案,使万元GDP耗水下降了0.1618 m3,单位耗水产出增加了8.66元;③最优方案可以实现水资源消耗最小化,水资源消耗量比规划期可供水资源总量少0.48亿m3,可以缓减用水压力,有利于地下水位的逐步恢复;④土地利用结构调整优化必须与节水型社会建设同步推进,才能在确保综合效益的前提下达到水资源利用最小化,实现区域可持续发展。     

Factors affecting runoff and sediment yield on the semiarid loess area in Northern Shaanxi Province,China

The semiarid loess area in north Shaanxi Province is one of the most serious areas of water erosion in China. The Chinese government initiated the project “Grain-for-Green” for soil erosion control in 1999, with significant effect. Vegetation, rainfall, soil, and topography are the most dominant natural factors affecting soil erosion; therefore, the aim of this research was to investigate the effects of these four factors on runoff and soil loss at the runoff-plot scale over five years and use the Gray relational analysis methods to compare the impacts of these factors. Five runoff-measuring sites were established in five different vegetation types. The results show that the relative impacts of the four factors on runoff were: rainfall > soil > topography > vegetation, and the relative impacts of the factors on sediment yield were soil > runoff > rainfall > topography > vegetation. We also analyzed the weights of these four factors on runoff and sediment yield during the wettest year alone. For that year, the relative weights of the factors on runoff were topography > rainfall > soil > vegetation, and the relative weights of the factors on sediment yield were runoff > soil > rainfall > topography > vegetation.     

厦门地震台伸缩仪畸变现象原因探讨

通过对厦门地震台伸缩仪畸变现象分析,认为引起畸变的原因很多,比如仪器故障、电源故障、干扰等。也可能另有其他干扰因素,有待在今后的工作中继续观察、探讨。