周期图

Second, this dissertation analysises the performance of TA cyclospectrum estimation, and derives the averaged cyclic periodogram which can make the variance to be reduced.

第二，本文分析了TA(Time Aliasing，时间重叠)循环谱估计方法的性能，并推导了使方差得以减小的平均循环周期图方法。

The 6th chapter studies the application of spectral estimation theory including periodogram and multi-taper spectral estimation in the detecting activation.

接着在第六章我们研究了包括周期图和多窗口谱估计在内的谱估计理论在求取大脑激活区中的应用。

Result It was found that improved periodogram and Wavelet transform performed better than the method currently used in clinics. The improvement in performance are manifested by their high accuracy in picking up the peak value and higher resolution.

结果 改进的周期图法和小波变换方法比目前临床所采用的检测算法在准确检测谱峰峰值及其位置、高分辨率提取信号频谱特征等方面，具有更大的优越性。

A registration experiment based on the averaged periodogram algorithm is carried out finally, whose result proves that the new algorithm could improve the accuracy of registration efficiently.

最后使用平均周期图法进行了配准实验，试验结果验证了新算法在提高配准精度方面的有效性。

The bias of cyclic periodogram with ssinc window is analyzed in both spectrum frequency direction and cycle frequency direction, and that the TA cyclic spectrum estimation is unbiased is proved.

通过分析加ssinc窗的循环周期图在谱频率方向和循环频率方向的偏差，分析了TA循环谱估计是无偏估计。

MATLAB classical periodogram power spectrum estimate of the signal power spectrum estimation.

详细说明： MATLAB经典周期图法功率谱估计对信号进行功率谱估计。

The investigation and simulation results show that the two methods are effective and practicable on predicting for and controlling the movement cross direction of shipping: periodogram predictor and controller is super than optimal predictor andcontroller in the case of large-scale nonlinear system.

本文通过理论研究和大量仿真计算结果表明，利用这两种方法进行船舶横向运动姿态预报及控制均是可行的：周期图预报及控制的方法在船舶大范围运动的预报控制中，控制效果比经典的LQG控制效果更好。

The character of the target noise is studied systematically, especially the spectrum character of target noise are deeply analyzed. On the basis of it, the power spectrum of two sorts of target noise is estimated with the method of average periodogram using the actual measured data of target noise.

系统地研究了目标声场特性，对目标噪声的产生及其频谱特性进行了深入分析，在此基础上，利用目标噪声实测数据，采用加窗平均周期图法，对两类目标噪声进行了功率谱估计，并对其频谱特性进行了深入分析和研究。

Among so many synthesis methods for FGN, there are the spectrum-based approaches, spectral simulation and Paxson method, which features and the relation between are explored in this paper. Morever the spectrum-based estimation for hurst exponent, periodogram, is researched.

在众多的合成分形高斯噪声的方法中，研究了基于功率谱的FGN的生成算法，谱模拟方法和Paxson方法的特点以及联系，同时对基于功率谱的Hurst指数的估计方法，周期图法进行了讨论。

Periodogram as a new predictor and controller is rarely and become more and more being at a premium overseas and inland. As compared with optima control, periodogram predictor is rather meet the case of large-scale nonlinear system, optimal control is rather meet the case of smallness linear system.

周期图预报的方法在国内外尚属比较少见但正逐步受到重视的一种新型预报控制方法，它与经典的LQG控制相比，更适合大范围非线性系统的预报控制，而经典的LQG比较适合小范围线性化的系统。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。