Insomnia and short sleep duration, even in young children, resulted in a physiological activation of the sympathetic modulation.
失眠症和短睡眠周期，甚至在幼儿中也能导致交感神经调节的生理激活。
2
Pulse width Modulation device is a circuit which can produce square wave signal with fixed period and adjustable pulse duration ratio (pulse width).
脉宽调制器是一种能够产生周期固定而占空比(脉宽)可调的方波信号的电路。
3
And a theoretical model is established to expound the variation of pulse duration and the modulation on the pulse envelope similar to the diffraction characteristics in spatial domain.