The results show that the main factor is the heat transferring to the material, the conglomeration and growing of the cobalt powder on different material bed is effected by the temperature gradient.

认为对物料的传热是生产过程中的主要控制因素，由于料层中温度梯度的存在，影响到物料床中不同层次分解的钴粉聚集长大过程。

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But the theory about the flow regime of the wave boundary layer, the wave friction factor, the bed shear stress and the initiation of sediment motion has not developed very well.

而且波浪是海岸地区一个非常重要的海洋水动力因素，波浪作用下底部边界层的流态、底摩阻系数、床面剪应力和泥沙起动的理论还不成熟。

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The flow property of solid particle in flowing bed is a key factor affecting the efficiency.

固体颗粒在移动床内的流动特性是影响床层使用效率的一个关键性因素。

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