The cosine rather than the sine is customarily used in this case . 在这种情况下,习惯上用余弦函数而不是正弦函数。
Inside the film, the field varies sinusoidally and the entire surface-wave mode propagates alone the horizontal z direction . 在薄膜内,场按正弦函数变化,整个表面波模沿水平Z方向传播。
The advantage of the variable is presented and a sine function con roller is constructed 通过研究,提出了一个正弦函数开工的控制器。
Inside the film , the field varies sinusoidally and the entire surface - wave mode propagates alone the horizontal z direction 在薄膜内,场按正弦函数变化,整个表面波模沿水平z方向传播。
Since these two electric fields must be in phase at point p for constructive interference to occur , the arguments of the sine functions must be equal 由于两个电场在p点必须同相以获得相干,这两个正弦函数必须相等。