查询词典 radio-frequency spectrum

Also,the feasibility of demodulating frequency of low-frequency liquid surface wave from the spectrum was evaluated with Bessel functions.

结果表明，能够实时准确探测10Hz～40Hz的液体表面波参量，该方法为低频液体表面波的探测提供了新思路。

Based on the theory of frequency modulation,the principle that frequency jittering spreads the spectrum energy of the voltage and current is analyzed.

针对传统的固定频率PWM控制方式引起的波形频谱能量集中、谐波幅值较大的缺点，文章基于频率调制的理论分析了开关频率抖动技术扩散电压频谱以及电流频谱能量的基本原理，结合传统的PWM控制器，采用三角波作为调制信号实现简单的频率抖动的方法。

These technologies can enhance the resolution of lithography by changing the distribution of the object's spectrum in and out of the pupil, and then decreasing the object's lower frequency parts and increasing higher frequency parts.Modeling of the lithography is essential to the RETs.

空间滤波技术主要是指离轴照明技术和光瞳滤波技术，它们都是通过改变入瞳体或出瞳体的物体的频谱的分布，达到降低低频分量，相对提高高频分量，最终提高光强对比度，从而提高光刻分辨率。

The research stated above show that, arc spectrum signal can not only represent the process of droplet transfer, measure the frequency of droplet transfer, but also it has particular time field and frequency field characteristics and corresponding waveform modes for every kind of droplet transfer modes.

上述研究发现，电弧光谱信号不仅可以清晰地反映熔滴过渡的过程，测量熔滴过渡的频率，而且对应每种熔滴过渡形式，光谱信号都有独特的时域和频域特征以及波形模式。

They include induced polarization method,frequency spectrum IPmethod,trandient electromagnetic method, controlled-source audio-frequency magnetotelluric method and GPR .

这些方法有激发极化法、频谱激电法、瞬变电磁法、可控源音频大地电磁法和探地雷达。

More general, spectrum shape was related with the shape of response function, dispersion angle affect the lowest spatial frequency, and color cycle number can modify the distribution of low and high spatial frequency to change the smoothing effect.

一般地，光谱形状控制空间响应函数形状，色散角决定所能匀滑的最低频率，色循环数可改变响应函数特点，调整对空间低频和高频的匀滑效果。

More generally, spectrum shape was related with the shape of response function, the dispersion angle affects the lowest spatial frequency, and color cycle number can modify the distribution of low and high spatial frequency to change the smoothing effect.

一般地，光谱形状控制空间响应函数形状，色散角决定所能匀滑的最低频率，色循环数可改变响应函数特点，调整对空间低频和高频的匀滑效果。

The Hilbert modulus is defined as the sum of the square of a signal and its conjugation.Hilbert modulus is used to covert the fundamental component in original phase current to direct current component,the fault characteristics frequency of bar break is transformed into the twice slip frequency.The problem is solved that fault characteristic component in the spectrum analysis of the current is easily to be blanketed by fundamental component and is hard to highlight fault characteristics.

将Hilbert模量定义为原始信号与其共轭信号的平方和，利用Hilbert模量将原相电流中的基波分量转变为直流分量，原频谱分析的转绕组断条的故障特征分量转变为频率为二倍转差频率的电流分量，决了相电流频谱分析方法中断条故障特征成分容易被基波湮没而难以突出故障特征的问题。

At last, the frequency spectrum analysis shows that the four-winged chaotic attractor has extremely wide frequency bandwidth compared with that of the Lorenz system and Chua circuit, which is important in practical applications in communication encryption etc.

最后，通过比较该四翼混沌吸引子的系统、Lorenz系统、Chua氏电路等混沌信号的频谱发现，四翼混沌吸引子的系统信号具有极宽的频谱带宽，该特性在通讯加密等工程应用中具有重要价值。

At first the Digital frequency shifting repeater transforms the original signal to the 70MHz IF signal in the donor, then the Frequency shift relay digital processing unit Digital Spread Spectrum the IF signal and through the 5.8GHZ signal to transmit to the remote end.

数字移频直放站首先在近端机内将将信源信号转换为数字70MHZ中频信号，通过&移频中继数字处理单元&将中频信号数字扩频后通过5.8GHZ的信号传送到远端。

We got alerted a couple of times while we were down south that HETs were on the way to bring us back up north because things were going to go hot again, but it was just rumors.

南下的途中我们不只一次得到警告说重型装备运输车将拉着我们重新北上，因为局势正在变得重新紧张起来，但这只是谣传。

It's the one where they find the ghost in the salt mine.

这一集是演他们在盐矿找到鬼