graded neutral density filter 分级中性滤光片
filter of graded density 分级比重过滤
graded d filter 回水过滤器
graded-density filter 分级密度滤光片
Ceramics with graded pores possess the unique advantages of porous ceramics and functional gradient ceramics, which can be applied as thermal-insulating materials, filter materials and bio-materials.
气孔梯度陶瓷集成了多孔陶瓷与梯度功能材料的双重优点，因而在绝热保温、净化分离、生物材料等诸多领域有着广泛的应用。
After reviewing a few design methods of sand gravel filters, a new design method of filter using broad graded materials is proposed in the paper.
本文在回顾了滤层保砂性设计的几种方法后，提出了广级配砂砾滤层保砂性的设计计算式。
It has just begun to study the mechanism and design method of broadly graded soil filter.
多级配砾石土反滤层工作机理及设计方法的研究，国内外均刚开始。
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