Based on analysis on the law governing coal piling up in coal bin and with queuing theory, a math model has been set up to predict ash content in coal contained in coal bin.
文章在分析仓煤堆积规律的基础上，用队列理论思想建立了一个预测仓煤灰分的数学模型。
Now, coal reserves are piling up in warehouses and ports as prices fall because of declining demand related to the global economic slowdown.
如今，全球经济减速带来的需求下降令煤炭价格出现了下跌，仓库和港口也积压了大量煤炭。
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