The model depicts aerosol optical thickness, a measure of the amount of light that the aerosols scatter and absorb, and a proxy for the number of particles in the air.
这个模型描述了气溶胶的光学厚度（一个衡量光在气溶胶里分散和吸收的物理量）以及气溶胶代替空气分子的程度。
It was found that the barrier diffusivity depends on the diameters of coal particles the kinds of coal and the thickness of ash.
研究还发现，不同的颗粒直径、不同的煤种以及不同的灰层厚度、煤的灰层扩散系数均不同。
The falling and distribution process of powder particles along the thickness direction in webs is analyzed in this paper, and its determination was also investigated.
分析了粉末粒子在纤网厚度方向上的下落分布过程，并探讨了沿纤网厚度方向上粉末分布的确定方法。
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