排序方式: 共有6条查询结果,搜索用时 15 毫秒
1
1.
基于主成分分析的植被含水率模型 总被引:1,自引:0,他引:1
为了对岷江上游“生态水”的估测提供有效的数据源和方法,利用高光谱遥感技术定量研究了植被反射光谱与植被含水率的关系,测定了研究区多个采样点棕榈叶片的反射光谱和对应的含水率,通过二者的相关分析和逐步回归的方法提取敏感波段;为避免敏感波段之间相关性影响,采用主成分分析法提取主成分,建立主成分与含水率的定量分析模型,并建立主成分与标准自变量的回归方程,然后建立各个标准变量与原始自变量(反射光谱敏感波段)的回归方程,最终转换为植被含水率与反射光谱之间的模型.结果表明:棕榈叶片反射光谱在454 nm,668 nm,1 466 nm,1 664 nm和1 924 nm波段处与含水率显著相关;采用主成分定量分析模型的估算值与实测值相关系数为0.92,均方根误差为0.06. 相似文献
2.
George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
3.
4.
通过1∶5万区调工作,初步查明原万保沟群4个组间均以断层(韧性剪切带)为界面,在空间上呈条带状构造岩片态势展布。经填图发现该群实际上仅由火山岩组和碳酸盐岩组构成。并在火山岩组和碳酸盐岩组中分别获得了(1441±230)MaSm-Nd全岩等时线年龄和叠层石化石,确定其时代为中—新元古代;在地质填图中发现该群原上、下碎屑岩组属同物异名现象,笔者及前人获得了早寒武世微古植物化石及小壳动物群化石。据此,对原万保沟群进行了解体,解体后的万保沟群仅由火山岩组和碳酸盐岩组构成,重新厘定为万保沟群,并在群内新建两个正式组级构造地(岩)层单位,即温泉沟组和青办食宿站组。而将原上、下碎屑岩组依据古生物化石、岩石组合特征,重新厘定其时代为早寒武世,并新建立沙松乌拉组。 相似文献
5.
金属矿山矿井涌水是在矿山开采和利用过程中产生的特殊废水,对若干新建和续采铅锌矿矿井涌水水质进行分析,获得了新建矿山矿井涌水水质pH值在6.34~8.07之间,悬浮物在11.0~63.0mg/L之间;硫化物在0.005~0.02mg/L之间;铜在0.001~0.05mg/L之间;锌在0.05~0.41mg/L之间;铅在0.01~0.06mg/L之间;镉在0.001~0.05mg/L之间;砷在0.0007~0.066mg/L之间;汞0.0001mg/L;六价铬在0.03~0.04mg/L之间。续采矿山矿井涌水水质pH值在2.1~8.28之间;悬浮物在20~103mg/L之间;硫化物在0.002~0.015mg/L之间;硫酸盐在75~805mg/L之间;铜在0.01~0.65 mg/L之间;锌在0.08~285.67mg/L之间;铅在0.01~0.84mg/L之间;镉在0.03~2.18mg/L之间;砷在0.0006~1.0mg/L之间;汞在0.00001~0.00006mg/L之间;六价铬在0.004~0.024mg/L之间。大部分续采矿山矿井涌水为酸性废水,绝大多数续采矿山矿井涌水金属元素特别是主元素超出《铅锌工业污染物排放标准》(GB25461-2010)标准限值。探讨了模拟矿山开采条件浸泡矿石水质分析可获得新建矿山生产时实际的矿井涌水水质。 相似文献
6.
1