查询词典 frequency band

Because of the filtering property suggested, two-dimensional periodic screens which were named the frequency selective surfaces have attracted a great deal of attention for many years and have been found various applications, such as band-pass radomes, reflectors of antenna system, polarizers and so on.

「频率选择表面」是由一群在空间中呈周期性排列的金属所组成的二维阵列。由於其滤波的特性，多年来，吸引了大量研究工作的投入。研究中发现，频率选择平面在电磁波的许多频段中，具有广泛的应用。例如在微波中可用於雷达或天线系统，在红外光的频段中则可用於极化器或提升分子雷射的效率。

In consideration of human hearing system′s frequency selectivity,the effects of thickness of coupling plate on critical-band level were also explained.

在考虑了人类听觉对频率的选择性接收的前提下，研究了参与耦合的板的厚度对特征频带声强级的影响，讨论了从特征频带声强级到响度的转换过程。

According to a known work frequency, the medium thickness and its dielectric constant, the micro-band line width, the sizes of the substrate, the quadrant metallic plate and high resistant surface gap are computed preliminarily then to determine its final sizes by optimizing and emulating utilizing the emulation software of HFSS8.0 edition.

根据已知的工作频率、介质厚度及其介电常数初步计算出微带线宽度、介质基片大小、正方形金属贴片尺寸以及高阻表面间距；利用电磁场HFSS8.0版的仿真软件优化仿真确定最后尺寸。有望应用于双星定位收/发集成天线及相应工作频率的电路中。

The disposal scheme of piezoelectric patches in this article give a better control result contrast to the scheme based on strain theory in the band of lower frequency, Some conclusions can be referential.

通过计算比较可以看出，提出的压电片布置方案在低频段所得到的多阶模态控制效果，明显优于基于振动模态应变贴片理论方法所得到的控制效果，得出若干结论供参考。

We believe that the improvement of the frequency response is due to a two-mode beat that includes the main mode of the slave laser and the master laser mode, which coincides with the side band of the slave laser.

激光器频率响应的改善可以用两个模式的拍频来解释，一个模式是从激光器的主模，另一个是主激光器的模式，该模式与从激光器的边带重合。

The vestigial side band and coded orthogonal frequency division multiplexing digital transmission systems are accepted in digital HDTV transmission system. This paper gives a theoretical view to the performance of these two systems and the results of the systems simulation.

从理论上对数字高清晰度电视的两种传输方式——VSB和COFDM数字传输系统的性能进行了比较，给出了系统模拟结果，理论分析和模拟结果都证明这两种传输系统在性能上是等价的。

Therefore, the choice of single mode in the examination and the frequency-thick band of mode has been given a particular illumination separately in the paper, following a relative numerical simulation. And a multi-cyclical sine signal modulated by Hanning window is used to simulate the excitation wave, and then an inspected ring of nodes is established to receive the echo, finally how the length of the circumferential cracks, the width of the axial cracks and the degree of the thickness-reduce effect the result is explained through the analysis of the result, further more, the reflection factor in the defect has been calculated.

因此，本文也就单一检测模态的选择以及模态频厚积段的选择分别予以了阐述，并有针对性的进行了数值计算：应用Hanning窗调制的多周期正弦波模拟单音频激励信号，并设置监测质点环接收回波，通过分析说明了管道的周向裂纹、轴向裂纹以及点蚀缺陷对缺陷回波所产生的影响，并进一步计算了缺陷处的反射系数。

Diplexers, a sort of three-port filter, can separate different band of frequency, and are the key component in the RF communication system.

双工器是一种三端口滤波器，起到分频和隔离的作用，是射频通信中常用的关键性器件。

The extrema of the seismic data are used to get the modulation function which operated with the original seismic data to get the high frequency part of the reconstruction data to rebuild the wide band data.

该方法利用地震资料极值点得到的调制函数通过与原地震资料的运算得到重建资料的高频部分，保留原地震资料的低频部分，得到重建的高频地震资料。

EPL makes use of short wave band glare to kill propanoic acid bacillus of acne inner , makes use of red light , infrared brightness to lower as well as radio-frequency current removes a color while the combination effect reducing sebaceous gland activity and , stimulates the deep collagen hyperplasia , restores a scar.

EPL利用短波段的强光杀死痤疮内的丙酸杆菌，并利用红光、红外光以及射频电流组合作用在降低皮脂腺活性的同时消除色沉，刺激深层胶原增生，修复疤痕。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。