查询词典 radio-frequency spectrum

In order to study the relatively intensity of Zeeman effect split spectrum line, the quantum number distribution and the relatively intensity are presented in detail by the analysis of Hg(546.1 nm) spilt spectrum line in the external magnetic field; the image of coherence circle is obtained by CCD, and the intensity of image is analyzed, the relatively intensity of the spilt spectrum line by image disposed is close to the theoretical result. It is concluded that the phenomenon and rule of Zeeman effect can be analyzed by CCD image technology.

为了研究塞曼效应分裂谱线的相对强度，分析了Hg(546.1nm)谱线能级在外磁场中的分裂情况，详细给出了分裂能级的量子数分布和理论相对强度；在此基础上采用CCD拍摄了分裂谱线干涉圆环的图像，并对其进行了强度分析，通过图像强度处理得到各分裂谱线相对强度与理论分析结果十分接近；表明采用CCD图像技术能较好的分析塞曼效应现象和规律。

The spectrum detection is one of the important steps in Cognitive Radio, and the cooperative spectrum detection is popular because of its good detection ability.

频谱检测技术是认知无线电中极其重要的环节，而协作式的频谱检测由于其良好的检测性能日益受到人们的关注。

Cognitive radio technology can improve the spectrum utilization greatly by sharing spectrum allocated to primary users opportunistically.

通过机会式地共享已分配的授权频谱，认知无线电技术可以极大地提高频谱的利用率，解决目前频谱资源日益遗乏的难题。

The general closed formula of power spectrum density for multi-user aggregate pulsed UWB radio is given, which is the theoretical base for optimizing PSD design of UWB radio. We investigate the main system parameters impact to the PSD of UWB aggregate signals.

从理论上给出了基于超宽带冲激无线电方式的常规调制信号的功率谱密度函数的一般性表达式，为超宽带信号的功率谱优化设计提供了理论基础，研究了系统参数对超宽带信号功率谱的影响。

The lower limit of what frequencies constitute "radio" is not precisely defined, but 5 kHz is a widely accepted starting point for the radio spectrum.

低限什么频率构成"收音机"精确地不被定义，仅5 千赫是一个广泛被接受的起点为无线电光谱。

Important precursor to the advent of cognitive radio that promises better use of radio spectrum.

重要前兆的到来认知无线电的承诺，更好地利用无线电频谱。

Radio operates, as you might expect, in the public portion of the radio spectrum .

正如想象的那样，无线电工作在无线电频谱的公共部分。

cognitive radio is an intelligent radio technology which has the capability to search and utilize underutilized spectrum resources.

认知无线电是指具有自主寻找和使用空闲频谱资源能力的智能无线电技术。

Wavelet modulus maxima with high frequency and low frequency coefficients were obtained firstly through multiscale decomposition of well logging data;then important wavelet coefficients were chosen according to the fusion principle where high frequency coefficients were taken as maximal absolute values and low frequency coefficients were selected by edge detection principle;finally alternating projection algorithm was applied to reconstruct the fusion curve.

首先对原始测井曲线进行多尺度分解，得到不同尺度下的小波低频系数和高频模极大值；然后选用高频系数取绝对值极大、低频系数采用边缘法的融合规则，选取重要的小波系数；最后利用交替投影算法重构融合曲线。

The excellent agreements between simulated and measured results prove the accuracy of the established circuit model. Moreover, the varactor was added to the resonator to adjust its resonant frequency. As expected, the reactance introduced by the varactor indeed affects the net inductance and capacitance obviously. It is noted that, not only the shift with the center frequency, the inductive or capacitive of the reactance can also provide a parameter to switch its frequency toward the two directions away from the one without varactor. As a consequence, a wideband tunable band-pass filter is achieved. Although the bad quality factor with the diode strongly increases the insertion loss, this concept was proved to be available for effectively tuning the center frequency of such a class of band-pass filter.

另外，在共振器上的varactor是用来调整共振器的共振频率，如预期的，由varactor所造成的电抗确实的影响到共振器的总电感和电容值，值得一提的是，不仅滤波器的中心频率可以被改变，这电抗是电感性或是电容性也将决定滤波器的中心频率将大於或小於未加varactor时滤波器的中心频率，利用这个结果，我们也实现了一个宽的可调频率带通滤波器，虽然不理想之二极体的Q值增加了滤波器的介入损失，但这原理是被证明可有效的用於调变带通滤波器的中心频率。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。