查询词典 audio frequency

In order to avoid the inaccurate measure of the positions of the CTF zero blurred by attenuation at high frequency, we used a Gaussian curve to compensate the attenuation of Fourier transform of image at high frequency in such way that the amplitudes of two CTF zeros at the curve were compensated to the same value.

由于冷冻电子显微图像通常信噪比很低，衬度函数曲线的零点的位置不容易分辨。

In consideration of the features of gearwheel drive box faults of the horizontal rotary screen roller printer and the basic principle of reversal frequency analysis and its advantages in failure diagnosis , reversal frequency analysis is adopted in fault diagnosis of gearwheel drive of the printing machine and better results are obtained.

介绍了卧式圆网印花机齿轮传动箱故障的特点以及倒频谱分析的基本原理和在故障诊断中的优点。

By analyzing the bode diagram of HAPF system and minimizing the capacity of HAPF, the paper presents a frequency dividing control method based on fuzzy-PI. In this mean generalized integrator is used for frequency dividing integral and fuzzy arithmetic is for adjusting PI coefficients timely. Compare with other kinds of control methods, the proposed one is more simple and easier realization.

该文由常用的并联型HAPF的结构特点分析出发，从容量和幅频特性2个方面探讨HAPF控制中进行有效分频的必要性，根据HAPF对控制方法的要求，文章提出一种基于广义积分的模糊自整定PI控制方法，即通过广义积分实施对周期量的分频积分，同时由模糊算法进行比例和积分系数的在线调整，从而有效实现对HAPF的分频控制。

Most wireless connections use a frequency of 2.4 gigahertz (2.4 billion cycles per second)— a similar frequency to mobile phones and microwave ovens.

大多数的无线连接使用的频率为2.4千兆赫（ 24.0亿赫兹）-类似的频率，以手机和微波炉。

According to the result of experiment, 0.5% sodium hyaluronate was chosen as gel base to select the enhancers. By the result of rheology, the sodium hyaluronate gel possess the property like pseudoplastic fluid, and viscosity was high/low in low-frequency/high-frequency, which was propitious to spreading and glutinousness.

在处方前研究工作的基础上，以药物体外经皮累积渗透量为指标，考察了HPMC和玻璃酸钠对药物体外经皮渗透的影响，根据实验结果选用0.5％玻璃酸钠为凝胶基质进行促渗剂的筛选。

By adding an equivalent harmonic impedance in the branch circuit of power grid, this HAPF could force all the harmonic currents flow into passive power filters, which resulting in eliminating harmonic contamination more effective. And using the capacitive feature of PPF in the fundamental frequency, this HAPF could compensate fixed-capacity reactive power without increasing APF's burden. Moreover, in order to decrease APF's cost, the fundamental voltage will largely be endured by capacitor in view of the series resonance circuit tuned at the fundamental frequency, so the APF just bears little harmonic voltages.

其基本工作原理是：有源部分等效于在电网支路中串联了一个谐波阻抗，该谐波阻抗对基波电流不起作用，而对谐波电流产生很大阻碍作用，迫使谐波电流流入无源滤波器，从而达到滤除谐波的目的；同时新型注入式混合有源滤波器还充分利用了无源滤波器的无功补偿功能，在不增加有源部分容量的前提下，可以提供一定容量的无功功率；由于有源部分承受的电网基波电压不大，也没有基波电流流入，因此逆变器容量小，初期投资较小。

Frequency for imaging of a line grid with cosinus form transmission. The spatial frequency is

MTF 表述了以余弦方式传输的线列栅格相对于空间频率的图像的质量和对比度。

High frequency ground wave radar; frequency stepping ; signal processing

高频地波雷达；频率步进；信号处理

The capacity of the system and the number of the base station are decided, and the frequency reusing is three frequency group.

根据井下无线传输的特点及对设备体积的要求，选择了系统工作频率。

The frequency dispersion and variation of group velocity with frequency are also calculated.

分析表明，两种界面上的非线性TE表面波均存在频率通带和禁带，且带宽是传播功率的函数。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。