Using the function between the porosity and the diffusion coefficient and frequency in the diffusion impedance, the finite diffusion model evaluated the porosity.
有限扩散模型则利用孔隙率与扩散系数和频率间的函数关系测定；
The conductivity mechanism of this membrane was studied with A. C. impedance method, the experimental results prove that the impedance of the boundary is controlled by the diffusion process.
用交流阻抗法研究了膜的传导机理，实验结果表明界面阻抗受扩散过程控制。
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