查询词典 spectrum

Based on the wavelet and multi-resolution theory, a new method is proposed to construct the protection judgment to discriminate the inrush current and internal fault by the ratio of high frequency segments in different scales of the energy spectrum.

基于小波多分辨率分析理论，提出了一种以能量变化率的比值作为判据，区分变压器励磁涌流和内部短路电流的新方法—小波能量谱图解法。

In this paper, interpolated circular arrays are used to perform 2-D spatial-spectrum estimation for wide-band sources.

本文提出了一种用插值圆阵估计宽带信号2-D空间谱的新方法。

Firstly, the structure of all phase spectrum is analyzed and the all phase spectral interpolation formula is derived.

首先分析了全相位频谱的结构，给出全相位频域插值公式。

The results are of significance for studying the high-temperature spectrum by experimental and theoretical calculation for interstellar molecules.

这对进一步研究星际分子高温光谱的实验和理论都具有一定的参考作用。

Time domain signal is transformed to the frequency domain signal by FFT. Dispersion curve is obtained from phase angle that is calculated by the frequency spectrum analysis. A compound dispersion curve is obtained from the dispersion curves intervale, and the representative dispersion curve is used to evaluate dimensions and quality of soil grouting body.

由FLAC所得不同点位的速度历时透过快速傅立叶转换后，得到频率域讯号，再经过频谱分析计算其相位角，得到其频散曲线，由不同间距的频散曲线集合成复合频散曲线，再绘制成一"代表性"频散曲线，以评估灌浆体品质及范围。

Attempting to cover the full spectrum of tuning issues with a single, comprehensive model is bound to fail because of the lack of sufficiently accurate mathematical models or the intractability of advanced models.

企图进行全面的调整问题与单一综合模式是注定要失败的，因为缺乏足够精确的数学模型或先进棘手型号。

In every period, do the following operations:# For each 8*8 block, do the discrete cosine transform, then take out direct current coefficient in each block, using the transformation above for each DC coefficient, the gold stands for the code of the spread-spectrum we use when embedding the different watermark bit in different frames, after all of the watermark information which we want to embed is embedded, then do the inverse discrete cosine transformation, and store the current frame in a new file.

于是利用DCT变换域的这点重要的几何不变性，我们可以推导出一种能够抵抗几何攻击的视频水印算法，即将所需要嵌入的水印信息以127位扩频序列作为辅助，以求和值形式嵌入到DCT变换后的每个宏块的每个DC系数当中，具体嵌入和提取算法如下：根据使用的扩频序列的长度N，基于相关的嵌入器需要选取包含N帧的视频子序列，令这N帧视频子序列作为一个嵌入周期，对于每N帧视频子序列做如下的操作，#即对于每个8×8的像素块进行DCT变换，然后取出每个DCT变换后的直流分量，对于每个DC系数，做如上所述的变换，其中gold为在第k帧中嵌入第i位水印信息时使用的扩频码字值，待将所有需要嵌入的水印信息全部嵌入后，再做反DCT变换，保存当前帧。

In addition, we find that the spectral index at radio bands varies with time, showing the form of inverse spectrum.

另外我们发现，谱指数随着时间而发生变化，这种变化在5GHz、8GHz和14.5GHz之间多表现为逆谱的形式。

Starting from the sampling theorem,the fast Fourier transform computation of angular spectrum diffraction formula and its inverse operation are studied.

从取样定理出发，对角谱衍射公式及逆运算的快速傅里叶变换进行了研究。

We study inverse problem of mixed Spectrum Data in the third chapter of thisM.S. thesis, i.e.

在研究这些矩阵的基本性质的基础上，给出了解的表达式以及相应的算法和数值例子。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。