频率

It is more valuable in time series analysis than unstandardized principal analysis.2 Fourier Analysis can decompose a time series signal into different frequency components, which represent different seasonal mode.3 The Phenology characteristics extracted from multi-temporal NDVI data are used for a vegetation classification.

2傅立叶分析将时间序列信号分解到不同频率成分中，各个成分分别代表了不同的周期变化模式，其中1/12频率分量概括了植被全年的单峰的季节性变化模式。 3多时相NDVI数据的时间序列分析结果中蕴含了植被的生物学信息，利用这些信息进行遥感分类。

Joint Time-Frequency Analysis is a new-style theory in Signal-Analysis, which combines the signals' characters in time domain with those in frequency domain. For reflecting the integral character, JTFT possesses good effect in analyzing unstationary or time-changing signals.

联合时频分析方法是一种新型的信号分析理论，它结合了信号在时间域与频率域的特性，反映了信号频率随时间变化的综合特性，在分析非稳定、时变信号方面具有很好的效果。

However, various intrinsic problems exist in a conventional DLL such as narrow operation frequency range, harmonic locking, lack of frequency synthesis function, mismatch among delay stages, and unsuppressed VCDL noise.

但是，传统延迟锁相回路却有著较小操作频率范围、缺乏频率合成弁遄B压控延迟线中相位间不匹配、及压控延迟线的杂讯不能被压制等缺点。使得延迟锁相回路的应用范围受到限制。

The just working frequency was obtained by calculation. By transient dynamics analysis applying piezoelectric coupling theory, the transient dynamics properties have been discussed. The analysis result provided a design reference on this kind of valveless piezoelectric pumps that use Cymbal actuators.

通过模态分析得到了Cymbal振子的前5阶固有频率和振型，选出其中最符合工作要求的频率和振型；通过瞬态分析，结合压电耦合分析，得到了振子在方波电压作用下的瞬态动力学特性。

Practice shows that this semiconductor laser self-mixing vibrometer can get good vibration waveform and vibration parameters from the vibration source.

可以测量出振动物体的振动频率、振幅以及还原振动波形，振动幅度测量精度可以达到0.325m，频率精度为1Hz。

The devices of sandwiched structure were prepared by compounding poly[2-methoxy-5-(2-ethyl-hexyloxy)-l,4-phenylene vinylene] with SiO_2. The thickness of MEH-PPV of these devices are different. We found the suitable frequency of drive voltage to obtain the greatest brightness. The device of cascade structure was prepared based on this work.

采用共轭高分子聚2-甲氧基-5-(2′-乙基-己氧基)-1，4-亚苯基亚乙烯基与SiO_2制成夹层结构器件，研究了不同发光层厚度的器件的发光特性，发现长波峰的发光强度随驱动电压频率的增大而增强、短波峰的发光强度随驱动电压频率的增大而减弱，进一步分析了其机理。

L ast month I contrasted the wordle (a collage of words with size proportionate to frequency of use) of the contents of my personal profile and my friend Siona's , and commented on how hers seemed more reflective of me than mine did.

上个月，我把分别用我和我的好友西欧娜的个人简介做成的&文字云&（一种根据单词的出现频率显示其大小的文字型抽象派美术）对比了一下，发现在她的简介中&我&出现的频率更多些。

However, upon detection of an incumbent narrowband signal in the channel, the WRAN endpoint forms a frequency usage map for transmission to another WRAN endpoint, wherein the frequency usage map identifies one, or more, of the subcarrier sets that would interfere with the incumbent narrowband signal.

然而，在检测到信道中在用窄带信号时，WRAN端点形成频率使用映射，用于向另一个WRAN端点传输，其中所述频率使用映射识别一个或者多个与在所述用窄带信号干扰的子载波组。

Our study demonstrated that the epitope-specific CTLs function was defected. Interestingly, in contrast to previous study, our result found that direct ICCS assys using peptide core 18-27 were able to visulize a population of IFN-γin the absence of specific pentamer binding in patients.

值得注意的是，我们发现在慢性乙肝患者外周血中Treg频率明显增高且与表位特异性CTL的频率呈现负相关，这种现象给了我们新的提示，为此我们用磁珠分选出Treg后在体外作不同细胞亚群共孵育，从而研究Treg与表位特异性CTL的相互作用机制。

Because when the frequency of close to the meshing of gears susceptible to the natural resonance frequency.

因为当啮合频率接近于齿轮系的固有频率时容易发生共振。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐