We've done this before-- this is the conservation of energy, and in order to find the period of the simple harmonic oscillation, we take the time derivative.
以前算过-,这是能量守恒，为了算出,简谐振荡的周期，我们求时间导数。
2
They are probably the result of even orderharmonic distortion - a hallmark of the SET - that do not occur to any significant degree in the Densen amplifiers.
他们很可能是偶数阶谐波失真的结果-一个系列的标志-没有发生任何的电线放大器的重要程度。
3
The effect on amplitude of EXAFS from harmonic caused by high order diffraction of crystal monochromator is discussed.