频率

Due to the complication of the geometric shape and the non-uniform distribution of the mass and stiffness,it is impossible to obtain the exact solution of natural frequencies of low-finned tube s.

针对低翅片管几何形状复杂，质量和刚度分布不均匀，振动特征值不能有封闭解的问题，采用瑞利-里兹法对低翅片管的固有频率进行了数值研究，获得了低翅片管弯曲振动固有频率的数值计算模型。

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。

The capacitance capacitors and inductors of power grid form parallel resonance circuit .It's frequency may be related to the existing power grid close to the harmonic frequencies, If there is power grid harmonic current sources, harmonic resonance caused by enlarged so that the voltage and current waveform distortion even more serious.

电容器的电容和电网的电感形成并联谐振回路，其频率可能与电网中存在的谐波频率接近，如果电网存在谐波电流源，谐振引起的谐波放大使电压和电流波形畸变更为严重。

In DTMF there are 16 distinct tones. Each tone is the sum of two frequencies: one from a low and one from a high frequency group.

DTMF有16种不同的按键音，每个按键音为两个频率之和，一个频率来自于低频组，另一个来自于高频组。

It is pointed out that beacuse the first natural frequency is much smaller than the second one, it bears the primary function in vehicle guideway interaction.

分析指出轨道系统的第一固有频率远小于第二固有频率，在车轨耦合振动中起主要作用。

With the filling nitrogen of 0.9 MPa, the maximal pressure ratio reaches 1.21 and the operation frequency is 25 Hz. The ratio of the harmonic wave of the engine was very little and the frequency jumping was not found in present experiments.

在充气压力为0.9MPa的条件下，该热声发动机最大压比可达1.21，远高于驻波型热声发动机，实验结果和理论分析均表明系统的工作频率为25Hz左右，实验装置的谐波比例非常小，且也没发现频率跳变等现象。

We choose the TMS320VC5402, digital signal processor, as the computing unit, filtering the sampled signal, truncating the harmonic whose frequence greater than 2500hz, then we use the window-interpolation FFT algorithm to get the refined frequence, amplitude, phase of harmonic in sampled voltage and current, other parameter such as harmonic ratio, active power, reactive power, power factor, three-phase unbalance can be also computed base one the result of window-interpolation FFT.

选用TMS320VC5402高速数字信号处理器作为运算单元，先对采样信号进行数字滤波，去除50次以上谐波分量，然后应用加窗双峰插值FFT算法计算电压电流的各次谐波频率、幅值和相位，以及谐波含有率、有功功率、无功功率、三相不平衡度等各项电能指标，同时利用锁相环电路硬件跟踪电网频率以减小采样失步度。

The manipulation of harmonic frequencies and the synthesis of harmonic frequencies are based on the harmonic rank.

泛音频率的处理和泛音频率的合成基于泛音次数。

This means we must also raise our frequencies into all of the highest realms in order to reach that FREQEUNCY.

这意味着我们还必须提高我们的所有频率的最高境界，为了达到这个频率。

The results show that, the RF decreases with the increase of gas holdup.

理论研究结果表明，随着持气率的增加，共振频率减小；当持气率较小时，共振频率衰减较快。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。