低频

The low frequency digital phase reflectoscope reflector in the industrial field is the general measuring tool which uses frequently, for instance the electrical network incorporation switches on when the electrical power system, requests two electrical network's electrical signals to be the same, between this request precise survey two power frequency signal phase difference.

低频数字式相位测试仪在工业领域中是经常用到的一般测量工具，比如在电力系统中电网并网合闸时，要求两电网的电信号相同，这就要求精确的测量两工频信号之间的相位差。

The result is that center frequency shifts to low-frequency with increase of incident angle under oblique incidence, the band width narrows correspondingly, for both square element arrangement and regular triangle arrangement.

结果发现，无论单元是按正方形布阵还是按正三角形布阵，在电磁波斜入射时中心频率都随入射角的增大而向低频漂移，带宽都相应减小。

Recombine the lower dermis and subcutaneous tissue reorganization of muscle fibers. Resulting in skin temperature rise of 1 to promote microvascular relaxtion.

超低频70毫秒电流low-frequency 70 millisecond Current真皮下层及皮下组织重组肌纤维，导致皮肤温度上升，促进微血管舒张具有：1。

Objective To investigate the relationship of resonant frequency and low frequency conductive hearing loss.

目的研究低频传导性听力损失与中耳共振频率的相关性。

Results The resonant frequency of low frequency conductive hearing loss and normal hearing group were different.

结果 传导性低频听力损失组的中耳共振频率与听力正常组有统计学差异。

The measuring deviation of reverberation time at low frequency in reverberation room is large.

针对混响室低频混响时间测量的偏差大这一问题，提出对随机噪声信号进行限幅或改用一系列单频信号发生器作稳定激发可显著改善测量结果的偏差。

Using the lower frequency antenna, data of the deep and thick layer of riprap (downwards to 35 m) can be received, hut the mixture of silt and stone in the bottom cant he differentiated.

检测表明，低频天线可用于检测深厚抛石层，取得深达35 m左右抛石层底部反射波信息，但无法分辨出底部泥石混合层。

According to test data published by several manufacturers of rigid fiberglass and rock wool, the denser types absorb more at low frequencies.

根据试验数据公布的一些制造商的硬性玻璃纤维和岩棉，密集类型的吸收更多的低频。

Firstly, the digital watermarking was transformed randomly, and then encrypted by chaos. The encrypted watermarking was transformed to one-dimensional row vector, and the pixel value was sorted. The coefficient of primitive image of stationary wavelet transformation was expanded to one-dimensional row vector, too, and then the sorted watermarking was embedded to the sorted low frequency and turned to two dimensions.

本算法先将数字水印图像进行置乱变换，然后将置乱后的水印图像进行混沌加密，将加密后的水印按行展开成一维行向量，并将像素值从大到小排序，将原始图像平稳小波分解得到的低频系数也按行展开成一维行向量，并按从大到小排序。

The coupling mechanism, frequency domain characteristics and propagation rule of three propagation paths of partial discharge signal

该方法所采用的测量频段较高，抛弃了以往定位方法中常用的"慢波"，不会受到窄带干扰和低频磁场耦合信号的影响；不存在定位盲区；具有足够的脉冲分辨率；所采用的频带较窄，相应的传感器较易制作。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。