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。
Building an average of a voice print's spectral components requires modifications to the sndpeek.cpp file.
构建平均声波纹的频谱组件要求修改sndpeek . cpp文件。
Using the methods of time series spectral analysis and Kalman filter, this article discussed the additive problems of two stochastic processes, mainly Auto Regression Moving Average (ARMA) processes.
本文利用时间序列谱分析和卡尔曼滤波的方法讨论了两个随机过程，主要是自回归滑动平均(ARMA)过程，的叠加问题。
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