Our Certificates are made valid through the official seal and personal chop of the Commissioner.

我们证明书是以盖公章和局长私人章方为有效.

Polynomial interpolating compensation algorithm for the time-delay of active structural control system was proposed, which is proved to be valid through a numerical example.

算例分析表明，时滞补偿后系统的控制效果有了明显的改善，说明该时滞补偿方法是有效的。