因此，对于泡沫金属这种细观结构非均匀性比较严重的材料，仅仅使用初始密度尚不足以刻画其材料特征。
Therefore, for metal foam with highly complicated mesostructure heterogeneity, it is not enough to describe their material characteristics only using initial density.
工程师们正在研发更多高效的方法，批量生产非均匀性多孔材料和固体泡沫，以适应具体的结构应用。
Engineers are developing more efficient methods to mass produce non-uniform porous materials and solid foams that can be tailored to specific structural applications.
基于互耦矩阵的特殊结构，给出了一种更具一般性的非均匀圆阵模型，提出了一种在未知互耦条件下的非均匀圆阵波达方向估计算法。
Based on the special structure of coupling matrix, a direction of arrival (DOA) estimation algorithm in the presence of unknown mutual coupling for the nonuniform circular array (NUCA) is presented.
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