采用冷冻干燥法可以制得下表面为致密结构，上表面为孔隙率较小的多孔结构，而内部是孔隙率较大的多孔结构的丝素膜。
A porous silk fibroin membrane could be prepared through freeze-drying process, with dense top surface, porous bottom surface in low porosity and porous inner portion in high porosity.
试验结果表明，精确公式能够很好地表达多孔介质孔隙率与体积模量之间的关系。
Experiments show that the accurate equation can express the relationship of porosity and bulk modulus of porous medium well.
多孔铝合金的孔隙率梯度主要是由渗流驱动压力梯度与凝固顺序所决定，而颗粒的自然堆积密度影响相对较小。
The porosity gradient of porous aluminium is mostly affected not only by the spontaneous stacking density of granules, but also by the infiltration pressure gradient and solidification sequence.
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