For optimized fly ashes, specific surface value determined by air permeability method is more desirable than fineness value by sieve analys...
对于优化粉煤灰，用透气法测定其比表面积比用筛析法测定的细度，更适宜于表征粉煤灰的品质。
This paper develops a model for measuring air permeability of partially saturated asphalt samples using falling-pressure method in laboratory introduced by Li et al.
介绍的实验室方法——自然降压法，结合实验数据，给出一个测量非饱和湿沥青样品空气渗透系数的方法。
Deduce the air permeability calculating formula base on the regression analysis method. Provide a strong basis for the selection of PET, aluminum PET and PVDC film in food packaging.
最后利用回归分析法推导出pet、镀铝PET及PVDC薄膜的透气率计算公式，为塑料包装材料在果品包装方面的选用提供有力依据。
The method has the advantages of flexible texture, better water permeability and air permeability, excellent tissue compatibility, controllable biodegradability, and no antigenicity.
本发明具有质地柔韧，具有较好的透水透气性能，优良的组织相容性、可控生物降解性、无抗原性。
The method has the advantages of flexible texture, better water permeability and air permeability, excellent tissue compatibility, controllable biodegradability, and no antigenicity.
本发明具有质地柔韧，具有较好的透水透气性能，优良的组织相容性、可控生物降解性、无抗原性。
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