The shortcoming of traditional filter media, such as high and fluctuating resistance, low efficiency for very small size dust, high frequency of regeneration etc.

使用传统滤料的袋式除尘器在操作过程中存在过滤阻力高且随时间波动大、对于微细粉尘过滤效率低、反清洗频率高等缺点。

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The thesis designs a frequency-power automatical control unit based on PLC, enabling generators to run reliably even if in the event of heavy load fluctuating.

本文设计了一种基于PLC控制的自动调频调载装置，可使发电机组在大负荷波动的情况下也能可靠地运行；

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The result indicates that the theoretical analysis is correct, and no resonance will appear between the fluctuating pressure of water flow and the gate vibration frequency.

结果表明：该闸门理论分析方法基本是正确的；其自振频率不会与水流脉动压力发生共振。

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Extrapolating from Dr Freund's laboratory experiments, the strain in a real-life geological fault such as the San Andreas could, as it shifted, generate hundreds of thousands of amperes per cubic kilometre in a fluctuating pattern that would cause very low frequency radio waves to be emitted, thus disrupting the ionosphere.

ECONOMIST: Predicting earthquakes