闭孔率

液氢贮箱泡沫绝热材料闭孔率测定方法的研究

Measuring method of the closed cell proportion of insulating plastic foams for liquid hydrogen tank

说明分子链上发生了原位成环反应，形成的刚性酸酐环、六元酰亚胺环以及梯形结构使MAA/AN共聚物泡沫具有高闭孔率和优异的力学、耐热性能。

Such anhydride and hexahydric imide rings as well as trapeziform structure resulted in a high closed-cell ratio , excellent mechanical and heat-resistant properties .

炭素材料显气孔率和闭孔率的测试&有效密度法球形闭孔泡沫金属材料力学行为研究

Testing of open porosity and colsed porosity of carbon material by effective density method the mechanical behaviors of closed-cell aluminum-alloy foams with spherical pores

闭孔率、孔径及孔径分布和泡孔壁厚描述了泡沫塑料泡孔结构的三个主要特征。

Mean cell diameter and its distribution , fraction of close cells and film thickness are three main parameters describing the characteristics of cellular structure .

总的来说改性后的酚醛泡沫表现出更低的游离酚、醛含量，更高的韧性，优异的热稳定性和闭孔率高的结构。

Generally , the modified phenolic foam showed lower free phenol , formaldehyde content , higher toughness , excellent thermal stability and high rate of closed-cell structure .

利用二维图像分析或仪器测定方法对材料的孔径及孔径分布、泡孔壁厚和闭孔率进行了表征；

2D image analysis methods and some devices were employed to determine mean cell diameter and its distribution , fraction of close cells and film thickness of these materials .

结果：与III组比较，I组、II组的闭孔神经反射发生率明显降低（P0.01），I组和II组之间闭孔神经反射发生率无明显差异（P0.05）。

Results The former two groups significantly reduced the rate of obturator nerve reflex ( P0.01 ) .