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[求助] comsol自定义参数求助!

本人comsol新手,想解图一和图二中红圈内的方程组,其中导电率σ=a(常数)*ρv(空间电荷密度),请问各位大佬,我应该如何设置,才能将σ设置为ρ的函数? 如有回复,万分感激

comsol自定义参数求助!
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comsol自定义参数求助!-1
2.PNG
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