1) three-band photographic ratio method
三波段相片比值法
2) band ratio method
波段比值法
3) band ratio
波段比值
1.
Though band ratio is highly evaluated as a single method in oil-gas exploration,the effect is far from satisfactory.
在基于单一方法进行油气勘探的过程中,前人对波段比值的方法给了很高的评价,但效果均不显著。
2.
However,the rock texture can be enhanced by selecting band ratio and by using composite negative processing method based on DN value analysis of diff.
本文从统计、研究雪和岩石光谱特征曲线入手，结合研究区积雪对不同ＴＭ波段图像中地形响应的漫反射统计分析特点，采取波段比值＋假彩色合成图像求反处理的方法，有效地突出了不同岩性的纹理信息，达到了区分岩类的目的。
3.
With the MODIS data from 2001 to 2005,areas of the tidal flats in the coastal zone of Fujian Province in China are calculated utilizing the band ratio of MODIS 250 m resolution of visible and near infrared band to high tidal level and low tidal level,and the results are verified by the 30 m resolution Landsat-7/ETM+ satellite image of the Luoyuan Bay and the Fuqing Bay.
以2001~2005年MODIS数据为信息源,每年选取高潮位和低潮位两个时相的MODIS数据,根据滩涂对MODIS 250 m分辨率可见光和近红外探测波数的光谱反应特性,采用波段比值算法来监测福建省海岸带的滩涂面积,并对监测结果用罗源湾和福清湾30 m分辨率的Landsat-7/ETM+影像进行验证分析,结果表明,MODIS数据的观测时间与海洋高低潮位时刻比较接近,便于对滩涂资源的遥感监测。
4) 3-bands method
三波段法
1.
Using 3-bands method, NDVI method for dimidiate pixel model and integration method by QuickBird image to estimate the vegetation fraction of study area, and the estimating values of the three methods were compared and validated.
利用QuickBird高分辨率遥感数据,运用三波段法、NDVI像元二分法、综合法估算研究区域的植被覆盖度,并对3种方法的计算结果进行比较和检验,结果表明:3种方法的估测值与实际值之间的相关性均较高(均达到了0。
5) three-ratio
三比值法
1.
This new diagnosis method expand coding bound of original IEC three-ratio.
针对IEEE三比值法对油浸式变压器故障诊断的缺码和多种故障发生时的难诊断现象,建立标准故障序列,利用灰色关联度原理判断故障气体与标准序列的关联程度,根据模糊熵的原理计算故障气体与标准模型的相对熵,相对熵最小的标准序列即为变压器的绝缘故障。
6) Three-ratio method
三比值法
1.
This paper deals with using DGA for fault diagnosis of transformer devices, introduces the basic theories of characteristic gas method, three-ratio method and Duval s triangle method, and further points out the indispersability of building DGA data base through practical examples.
本文叙述了油中气体分析在变压器类设备故障诊断中的应用,介绍了特征气体法、三比值法和三角形法的基本原理。
2.
Based on analyzing oil chromatogram data,using the ultrasonic method to test the position of partial discharge ,the electrification monitoring technology and three-ratio method,the fault reason of a light gas pressure protection actuation on the main transformer are analyzed.
针对一起主变轻瓦斯动作故障,在油色谱数据分析的基础上,利用局部放电超声波定位、带电监测技术和三比值法对故障原因进行了分析论证。
3.
Fuzzy C-means clustering(FCM) algorithm,BP neural network,rough set theory diagnosis algorithm and IEC 60599 recommended three-ratio method are adopted as monomial methods to diagnose fault independently in the new diagnosis model.
该方法采用模糊C均值聚类(FCM)诊断法、BP神经网络诊断法、粗糙集理论故障诊断法和IEC 60599推荐的三比值法这4种诊断方法作为独立的单项诊断方法,根据各自诊断的误判率,按照诊断误差平方和最小的原则计算出各个诊断方法的最优权重,形成最优投票组合模型,再求出最大发生概率的故障类型。
补充资料：波段
1.无线电广播中，把无线电波按波长不同而分成的段。如:长波﹑中波﹑短波﹑超短波。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条