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the meaning of Q and q in Acoustics Module

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if somebody know the meaning of Q and q in the equations as shown in attach file?
and i like to know if they are wave equations? what is kind book i can find them in?
My major is magnetics it is hard to know them well.

thanks


0 Replies Last Post 26 mai 2015, 22:57 UTC−4
COMSOL Moderator

Hello 艳丽 张

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