On the basis of those work, we continue to simulate and discuss the changes of heat island intensity caused by artificial heat source, aerodynamic roughness length and wind speed.

在此基础上，模拟并探讨了人为热源、风速、地面粗糙度等因素对城市热岛强度的影响。

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Conventional small wind turbines only work 20 percent to 40 percent of the time due to variations in wind speed, according to the Department of Mechanical Engineering of The University of Hong Kong and Motorwave.

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