A method of fabricating holographic optical element (HOE) for free-space optical clock distribution is presented.
提出了用二维全息光栅制作自由空间光学时钟分布中的全息光学元件的方法。
On an imported heat exchanger in some chemical plant, an offset caused by fabricating deviation is presented on the joint between shell and straight part of head. By means of finit element method.
某化工厂一台进口换热器，由于制造偏差，在封头直边段与筒体相接处产生错边。
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