Numerical simulation results indicate that in outer space air transportation of powder in pipes can reduce pressure losses and improve energy utilization ratio.
本研究中的数值仿真结果表明，在太空中采用管道空气输送能够最大限度地减小压力损失从而提高能源利用率；
The soft ground has characteristics such as rich natural water content, big air space ratio, high compressibility, low shearing strength and so on.
软土地基具有天然含水量大、空隙比大、压缩性高、抗剪强度低等特点。
The effects of temperature, the ratio of ammonia, the ratio of air and the space velocity of catalyst upon the conversion, molar yield and selectivity of the reaction were observed, respectively.
考察了反应温度、氨比、空气比和空速对反应的转化率，摩尔收率和选择性的影响。
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