The ash process has special requirements, the ash layer slightly thick and tough with leniency.

其灰地工艺具有特殊要求，灰层略厚且刚韧相济。

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Then, a heat percolation model was developed by the analogy of heat conduction in the ash layer to random resistor network.

在自行设计的实验台上研究了积灰有效导热系数随分形维数以及温度的变化规律，发现实验结果与模型预测结果一致。

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The Effective thermal conductivity of ash layer is one of the key parameters in the process of designing boiler and soot-blowing optimization.

电站锅炉尾部受热面积灰层有效导热系数在锅炉换热面设计以及优化吹灰中都是一个关键参数。

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Some 600, 000 years ago, it erupted and left an ash layer 10 feet deep as far as 1, 000 miles away.

FORBES: Fact and Comment

Some 600, 000 years ago, it erupted and left an ash layer 3 meters deep as far as 1, 600 kilometers away.

FORBES: Fact & Comment

Metop's suite of instruments retrieve a range of data - from the temperature and water content of the different layers in the atmosphere to the speed of the winds whipping across the ocean, and from the health of the ozone layer to the spread of volcanic ash plumes across the sky.

BBC: Weather satellites and the gathering storm