The equation of air demand was derived from the theory of oxygen transfer in aeration.

根据曝气过程中氧转移的有关理论，推导出需气量的表达式；

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An air water two phase flow model for air demand computation for tunnels is developed in this paper.

结合工程实例，利用水气两相流数学模型计算明流长隧洞的通气量。

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When determining air demand for tunnel ventilation, the air demand is taken from the bigger one between calculation of CO concentration index and smog concentration index.

隧道通风需风量的确定是取CO浓度指标和烟雾指标计算出来的较大者作为需风量。

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The International Air Transport Association, which represents 230 airlines around the world, predicts passenger demand will grow nearly 6 percent in 2010, while cargo demand is expected to see double digit growth.

VOA: standard.2010.03.30

The Indian middle class, which provides the majority of air travel demand, is forecast to grow by 200 million over the next 8 years.

FORBES: Etihad Airways First To Take Advantage Of India's Newly Opened Airline Market

In a self-serving speech to analysts last month, Carty, 53, complained about competitors who had the audacity to grow "more quickly than air travel demand"--thus taking away share points from other airlines.

FORBES: The ghost of Crandall

Expect more air passengers to demand Wi-Fi and personalized entertainment choices in the coming years.

CNN: 2022: Cheap flights, more rail and hands-free cars