An approximate simulation method has been developed for the shielding effectiveness of a rectangular enclosure with arbi......

In supply chain management,an important research direction is to coordinate the supply chain through introducing flexibl......

对语音形成的研究是一个古老而新颖的课题。很多学者认为语音初始形成阶段是任意的,是约定俗成的过程,但是语音事实告诉我们这种观......