A proposal for control of airflow in a mine fire is proposed by optimization of air quantity in a ventilation network.

提出了用通风网络风量优化计算的方法求解矿井火灾时期的风流控制方案。

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The method of limit is proposed for establishing the sufficient conditions for determining the direction in a ventilation network. The composite determinative m…

提出了用极限方法确定判别某些网路风流方向的充分条件，并对现有的井巷风阻复合判别法和节点位势法进行了分析和探讨。

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The method of limit is proposed for establishing the sufficient conditions for determining the direction in a ventilation network. The composite determinative method of res…

提出了用极限方法确定判别某些网路风流方向的充分条件，并对现有的井巷风阻复合判别法和节点位势法进行了分析和探讨。

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Though it was intended as a temporary shelter, its amenities were impressive: some 600 above-ground doors from which someone can enter the underground city from, 15, 000 ventilation ducts to provide fresh air, as well as multiple wineries, cellars and a complex network of passages, tunnels, and corridors.

BBC: Six lesser-known wonders of the ancient world