The theory has its origins in an effort to understand the strong force, the dual resonance model (1969).

弦理论最初是为了解释强相互作用力，也就是二次共振模型（1969）。

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Its natural frequency falls into two parts when the loads exerted on generator rotor are asymmetrical. Dual resonance phenomenon appears based on the former single frequency vibration.

当发电机的外接负载不对称时，转子的固有频率一分为二，转子的振动在原来单频振动的基础上，产生了双重共振现象。

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The active filter based on dual DSP can improve the performance of filtering, restrain the resonance between LC circuit and electrical network, and improve dynamic performance of compensation system.

采用基于双dsp结构的有源滤波器可以大大改善滤波性能，并能抑制LC电路与电网之间的谐振，提高补偿系统动态性能。

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Such techniques include fluorescence, paramagnetic resonance, microcalometry, circular dicroism, dual wavelength spectrophotometry, stop-flow spectrometry among others.

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