<正>位于宁（南京）淮（淮安）高速公路南京段的孙家凹天桥，是一座结构新颖的单肋钢管拱桥。笔者通过对该桥梁建设过程的介绍，从动态设计、施工监控和成桥检测几个方面阐述了工程建设实施过程控制的主要措施。

Because of the long time lag and the intense coupling between basis weight and moisture, a multi-variable DMC system model of a typical fourdrinier papermaking machine was developed in SIMULINK to make a simulation analysis. The results showed that the control system is stable, robust, and has a good performance at anti-jamming, when the DMC arithmetic was applied with the correct design of the parameters.