With kernel medium model, sound propagation characteristic in grain is studied.
从颗粒介质模型出发，对粮食中声传播性质进行了研究。
Taking into account rock loosing zone, the two-medium model is adopted in the computation.
计算中采用考虑围岩松动圈的双介质模型，反演松动圈的弹性模量。
Coal rock body is simplified as a double-medium model, including a plenty of micropores and cleats.
煤岩体既有大量的微孔隙又有割理的存在，可以简化为双重介质模型。
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