This paper discusses the basic theory of digital valves and digital hydraulic systems and focuses on the high pressure, large flow direct digital relievers which have been developed recently.

对数控液压系统及数字阀作了理论上的探讨。 并着重对作者近年来研制的一种新型高压大流量直接式数字溢流阀，进行了理论分析、数字仿真以及试验研究。

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As a direct design procedure for the digital controller, sampled data systems control has received wide attention in these years.

采样控制作为一种数字控制的直接设计方法，近年来引起了广泛的重视。

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Stratasys boasts an impressive portfolio of 3D printing and direct digital manufacturing solutions, with systems that produce parts with a wide range of capabilities and materials.

ENGADGET: Stratasys and Objet combine 3D printing / rapid prototyping powers, working on printing money