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- The high frequency pulse 50-100/sec is known as dense wave, the low frequency pulse 2-5/sec termed as rarefaction wave. 频率快的叫密波（高频），一般在50-100次/秒，频率慢的叫疏波（低频），一般在2-5次/秒。
- Discussed herein are mechanism, available ranges and applications of downhole low frequency electric pulse vibrotechnique in Henan Oilfield. 讨论了运用物理方法之一的井下低频电脉冲振动波技术影响油层的作用机理、适用范围以及在河南油田的应用情况。
- In electronics, undesirable low frequency currents interfering with a desired signal, and usually caused by a poorly screened alternating mains supply. 在电子学领域，一种不希望发生的低频电流，它干扰所要求的信号。通常这种现象是由于交流供电线路屏蔽不良引起的。
- The abnormal colours of seedlings turned a low frequency. 颜色异常的苗木出现频率较低。
- Laser direct writing of micro-OVD with low frequency templates[J]. 引用该论文 魏国军;周小红;周雷;陈林森.
- Low frequency GMI measurements after longitudinal AC and pulse current Joule-heat treatments indicate that the heat treatment has obvious influence on GMI effect, which showed diversified characters. 纵向交流电流及脉冲电流焦耳热处理后的低频GMI测试表明：热处理对材料GMI效应有明显的影响，其变化非常丰富，发现了一些新现象。
- If it is a low frequency sound, it is processed as an analog signal. 对低频声进行传统的处理。
- The direction of the low frequency current with maximum frequency was also WSW. 低频流出现频率最多的方向和潮流基本一致。
- This effect is obvious at lower frequency band. 这种效应在振动低频区段更为显著。
- Medium SMES (200 MVA) are able to compensate some low frequency disturbance. 中型SMES(200MVA),这类SMES能补偿某些低频度的扰动
- Helmholtz resonator has a good noise eliminating performance at low frequency. 亥姆赫兹共振腔具有良好的低频消声性能,被广泛地应用于低频消声方面。
- Armstrong was forced to use avery low frequency barely above audibility. 当时这样的频率被认为是“高频”，但只不过是现在所用调幅波段的底部而已。
- Peak indicator light and LF (low frequency) switch per mono channel. 每路单声信道具有峰值指示灯及低频切除开关。
- Purpose:Low frequency power amplifier,medium speed switching applications . 用途:用于低频功率放大及中速开关。
- Note: Close woundcoils will resonate at a slightly lower frequency. （注：密绕的线圈将会谐振在稍低的频率。）
- program control low frequency pulse treatment 程控低频脉冲治疗仪
- Very little effort has been devoted to the experimental measurement of low frequency combustion response. 在低频燃烧响应的试验测定方面只做了很少的工作。
- In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system. 在音响设备中出现的振荡频率极低的低频振荡，常因放大系统的正反馈回路引起。
- reverse low frequency pulse magnetic field 磁疗法
- low frequency pulse magnetic field 低频脉冲磁场
