低频

There is very strong evidence finding a relationship between maximum ELF magnetic field exposure greater than 16 mG and a 6-fold increase in miscarriages.

有非常有力的证据找到一个关系最大的接触极低频磁场大于16毫克和6倍，增加了流产。

So the ultra-low frequency absolute vibration detection is a difficult problem in engineering measurement field. In this paper, the ""high-frequency-suppression and low-frequency-lifting"" compensation method was presented based on the analysis of the inertial sensor with "" mkc "" structure.

本文通过对mkc结构惯性式传感器机理的分析，提出了一种对传感器传递函数进行"抑高扬低"的补偿方法，并对此补偿网络和系统幅频特性进行了优化，较好地克服了惯性式传感器低频特性差的固有缺陷，实现了传感器的微型化。

As a result, the model of low-frequency aberration induced by Nd:glass amplifiers is got. On the base of low-frequency aberration model some results are achieved such as the tendency of focal spot size changing as the RMS phase gradient changes and the characteristics for the scale length. 3. The simulation model of the beamline is set up and the propagating process is analyzed in the beamline. The correlation coefficient of two wavefronts is newly used to describe and estimate the adding result of them.

建立了求空间尺度的数学模型，并运用此模型对现有的放大片透射波前进行了分析，得出了多程系统中所用钕玻璃放大片引入的低频位相误差的空间尺度分布，并据此建立了模拟放大片低频位相误差的随机位相屏模型，在此基础上对焦斑大小随位相分布RMS梯度变化而变化的规律及空间尺度的特性进行了模拟研究； 3。

In chapter 2, basic theories of TEF method are introduced, and the EEAC method and its application in stability generator tripping control are discussed carefully. A lot of work still need to be done in order to make practical achievement.As a way to actualize this scheme, a new intelligent style under frequency and

同时根据多机模型特点及仿真结果提出了一种基于多机系统的低频减载设计和整定新方案，与传统方案相比，该方案提高了低频减载性能及系统运行方式的适应性。

The traditional algorithms of classification are no longer suitable because of the effect of the concept drift in data streaming. The research on fast and stable data mining systems with high accuracy has become more valuable in both theory and practice. The effect of low frequency concepts on time and space performance is studied and an LFCR algorithm is proposed in this paper, which reduces the low frequency concept with some mechanisms. The extensive experimental study shows that LFCR has improved performance in classification in comparison with RePro.

由于数据流中概念漂移现象的影响，使得传统的分类方法不再适用，因此研究快速、精确及稳定的数据流挖掘方法和系统具有较高的理论和应用价值；文章研究了基于频度的概念漂移中低频概念对分类时空性能的影响，提出了对其中的低频概念进行消减的算法，实验表明LFCR算法比RePro算法有更好的分类性能。

The monitor EDGE15CXPB is a highly efficient 2 way low profile system. The bass frequencies are reproduced by a high excursion 15" woofer with a 4" voice coil. The woofer is equipped with a copper ring on the pole piece to achieve the lowest distortion in the critical vocal range.

EDGE15CXPB 是一个高效率的二分频紧凑型多功能返送扬声器，低频采用15英寸远射程单元配备 4 英寸音圈，这种低频单元在中心极上装配有铜圈，可将语音频段的失真降到最低。

Main Products: Network Analyzer, integrated tester, spectrum analyzer, noise figure testers, receiver, telephone tester, high, low-frequency signal source, audio, video signal source, high, low-frequency oscilloscope, modulation device, the video analyzer and so on.

主要产品：网络分析仪，综合测试仪，频谱分析仪，噪声系数测试仪，接收机，电话测试仪，高、低频信号源，音、视频信号源，高、低频示波器，调制仪，视频分析仪等。

Used mainly engaged in Communications equipment Products: Network Analyzer, integrated tester, spectrum analyzer, noise figure testers, receiver, telephone tester, high, low-frequency signal source, audio and video signal source, high, low-frequency oscilloscope, modulation device, video analysis detector.

主要经营二手通信仪器产品：网络分析仪，综合测试仪，频谱分析仪，噪声系数测试仪，接收机，电话测试仪，高、低频信号源，音、视频信号源，高、低频示波器，调制仪，视频分析仪等。

Because seismic boreholes were deployed in the middle of coal seam, the energy of dynamite would be distributed symmetrically on the face of coal seam.

其中高频区大约以2000 Hz为中心，低频域的中心频率约为490 Hz，并且高频域和低频域的能量差异不显著。

In this paper, based on the frequency-domain processing model of the multi-polarization, low frequency UWB SAR system, with the consideration of the low frequency UWB electromagnetic scattering characteristics of the calibrators, the polarimetric calibration method is proposed.

该文基于多极化低频UWB SAR频域处理模型，考虑了极化校准中定标体的低频超宽带电磁散射特性的问题，给出了极化校准方法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失