A set of ac power-supply circuits ( usually three ) carrying currents of equal frequency with uniformly-spaced phase differences. 一组频率相同,相位彼此相差均匀的交流供电电路(一般是三相)。
Conclusions : Regardless of surgical approach, atrial fibrillation after lobectomy occurred with equal frequency. 结论:两种术式行肺叶切除的术后房颤发生率相同。
Therefore the positive and negative reflection coefficients tend to appear with approximately equal frequency ( taking the case of a downgoing wave only ). 因此,正、负反射系数出现的频率基本上是相等的(仅就下行波而言)。
This paper investigates the effect of wavelet transform on the phase angle measurement of two sine waves with equal frequency. 本文研究了用小波变换降低噪声对正弦波间小相角差测量的影响。
The negative refraction of photonic crystals is discussed. It is pointed out that one can define an effective refractive index of the photonic crystal when the equal frequency surface approaches circular. 深入研究了光子晶体中的负折射现象,指出当等频率(EF)表面接近于圆时,可以给光子晶体定义等效折射率,而且光子晶体的等效折射率可以小于1,也可以为负的。