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The changes in intrinsic time of viscoelastic materials are usually studied in the framework of the free volume theory. 这个特征时间受多种因素的影响,如温度、物理老化、压力和溶剂浓度、损伤、应力水平或应变水平等。
A detailed mechanism of graded-index formation process was simulated according to the Vrentas-Duda free volume theory. 利用Vrenta-Duda自由体积扩散模型模拟了该梯度型聚合物光纤棒中折射率梯度形成的过程；
By means of positron annihilation lifetime spectra (PALS), the free volume of polymer could be tested. 通过正电子湮没寿命谱技术(PALS)探测聚合物的自由体积特性,能够了解聚合物的微观性质。
With the dehydration the free volume inside cages bacame larger, and when dehydrated to a certain degree,Bronsted acid, as the ac. 研究表明，随着水的逐步脱除；笼内自由体积逐步增大；当脱水至一定程度后．笼内开始出现活性中心-质子酸。
The positron annihilation technique was applied to study the relation between relative free volume and irradiated graft for PTFE. 用正电子湮没技术研究在聚四氟乙烯辐照接枝过程中的自由体积与正电子湮没寿命谱的关系。
With the augmentation of grain size, surface defects of the manganese zinc ferrite nanocrystallines minish, and intergranular free volume combines. 随着粒径的增大，纳米晶的表面缺陷减小，晶界间的自由体积发生复合。