Several methods for quench correction-external standard channels ratio method, spectral index method and "H number" method are simply introduced.

本文简单介绍了几种猝灭校正方法——外标准源道比法，样品谱指数法和H数法。 首先比较了这些方法的特点。

Objective To observe the effects of different adjuvants on bispectral index (bis), spectral edge frequency (SEF) of electroencephalogram during lumbar anesthesia.

目的观察腰麻中不同辅助药对脑电双频谱指数(BIS)和边缘频率(SEF)的影响。

The result showed that the homogeneous degree of the soil nutrient was increased, the variability of spectral index and the yield were reduced in the management zone divided by soil data.

结果表明，利用土壤养分和光谱数据划分的管理分区内，各土壤养分的均一度得到了提高，光谱指数和产量的变异系数普遍降低。

On the histograms of their redshift, optical luminosity and average optical X-ray spectral index, it is found that X-ray selected quasars are distributed at the low ends of plots of these parameters.

发现在它们的红移、光学光度以及平均光学- X射线谱指数的直方分布图上，X射线选择类星体统计上都分布在这些参数图的低端。

Plant condition assessment using remote sensing techniques have been associated with spectral vegetation indices such as the normalized difference vegetation index (NDVI).

用遥感技术进行植物评估可与光谱植被指数联系起来，如规一化差分植被指数NDVI。