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Based on our reduction of the ASCA observational data and fittings of the low and medium energy X-ray spectra, we combine the ASCA and BeppoSAX observed PG QSOs to form a sample for statistics of the spectral features on the X-ray spectra.

从处理ASCA观测数据和分析X射线谱出发，将有ASCA和BeppoSAX观测结果的PG类星体构成一个样本，对它们的中、低能X射线谱上的观测特征进行统计。

Ascertainable clustering number and large training sets are vital problems of spectral clustering.

自动确定聚类数和海量数据的处理是谱聚类的关键问题。

As an application, a solution of the Manakov-type equation associated with a 3×3 spectral problem is given by using the results on the third coupled equations of the matrix AKNS hierarchy.

作为这样推广的例子，可以从矩阵型AKNS族n=3的结果，给出了一个与3×3谱问题相应的Manakov型方程的解。

In theory, this model can solve the question which occurrs in multi-spectral emissivity measurement by the assumptive model method.

理论上，该模型可以解决多光谱发射率测量中假设模型法存在的问题。

Based on the propagation law of partially coherent light, the spectral changes of Gaussian Schell-model beams passing through an astigmatic aperture lens are studied.

从部分相干光的传输理论出发，研究了高斯-谢尔模型光束通过光阑像散透镜传输轴上的光谱变化规律。

In the regions of astrodome physics, solid physics, photochemistry and medicine, measurement and calibration of spectral irradiance of ultraviolet and vacuum ultra-violet have become more and more important research means and instrument.

紫外和真空紫外光谱辐照度的测量和定标，在天体物理、固体物理、光化学及医药学等领域中已成为越来越重要的研究手段和工具。

In this paper, based on the effect of both of them in latitude and time observation, the data of observation of a Danjon astrolabe at the Shanghai Observatory from 1960 to 1978 were analysed with the method of maximum entropy spectral analysis.

本文根据二者对纬度和时间观测结果的影响，用最大熵功率谱方法方析了上海天文台丹容等高仪1960～1978年的观测资料，得到了空间自由章动在纬度和时间资料中引起的周期、振幅分别为P2，1=208平太阳日、A1=0。

This paper analyzes the application of MC-CDMA in a multiple antennas environment and derives an equation for the closed-form asymptotic spectral efficiency of the system with matched filter and linear minimum mean square error front-ends.

该文从信息论的角度分析了MC-CDMA在多天线通信系统中的应用，得到了当采用匹配滤波器检测子和线性最小均方误差检测子的渐进频谱效率的闭式表达，研究了可用于指导系统设计的频谱效率与发送天线数和接收天线数的关系。

The axial spectral blueshift increases with increasing C and approaches an asymptotic value in the far field.

随啁啾参量增加，谱线宽度展宽，轴上光谱蓝移增加，在远场蓝移趋于一渐近值。

The second part of this thesis mainly deals with the classification problems of heavy element atomic spectral energy levels.

本文的第二篇论述了将模式识别-人工神经网络方法的PCA-BPN（主成分分析-反传神经网络）和PLS-BPN应用于CmⅠ、UⅠ、CmⅡ等重元素原子光谱能级的分类研究工作，明确指认了许多前人应用早期模式识别方法以及CPN方法无法确认或错误指认的未知能级所属的电子组态，取得了较好的效果。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。