介绍了大型汽轮发电机组频率异常运行的危害和对低频保护的技术要求及准则；
The paper introduced the hazard of large turbine generator operation under abnormal frequency and technical requirements and criteria for low frequency protection.
目的研究低频脉冲磁场对脑缺血再灌注损伤大鼠海马神经元的保护作用。
Objective To investigate the protective effects of low-frequency pulsed electromagnetic field (LFPMF) on neuron following cerebral ischemia-reperfusion injury in rats.
同时算法结合了人眼视觉模型，有效地保护了图像的低频部分和强边缘部分。从而确保了加密图像的视觉效果。
At the same time, combined with the human visual model, our algorithm guarantees the visual impression and protects the low frequency part of image efficiently.
文中特别介绍了发电机保护和低频低压解列技术的应用。
Specially, generator protection, under-voltage protection and frequency protection are introduced in this paper.
主回路采用由18个晶闸管组成的三相零式电路，并辅以晶闸管的保护电路，通过控制可以得到低频正弦波的电压（电流）输出；
The main circuit is consisted of 18 thyristors circuit and protection circuit. With the help of control subsystem, it can get the output of low frequency voltage (current) with the shape of sine wave;
超声波的空化作用能够抑制藻类生长，从保护水体生态系统以及超声波技术本身的特点考虑，低频率、低功率的超声波更适合于水体抑藻应用。
Consider of water ecosystem protection and characteristics of ultrasonic technology, low frequency and low power ultrasonic especially suit to control algal growth in water body.
同时也对变频起动过程中加装低频过流保护的必要性以及该保护的应用提出了见解。
The necessity and the application of over current protection during start-up course are discussed.
同时也对变频起动过程中加装低频过流保护的必要性以及该保护的应用提出了见解。
The necessity and the application of over current protection during start-up course are discussed.
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