Meteorological records in the past 50 years indicate that there has been a sharp decrease in sand dust storm frequency, which is in accordance with the decrease in annual mean wind speed.
近50年来多个站点的观测记录表明了沙尘暴的发生频率处于快速下降的过程，这恰好与年均风速的变化趋势较为一致。
How long do you need to establish the mean wind?
需要多长时间来确定平均风？
The maximum (minimum) of mean wind energy density is 298.
平均风能密度最大值达298。
The paper presents a study on measuring the vent mean wind velocity of solar collecting wall in solar house.
本文对被动式太阳房集热墙风口平均风速的测定进行了研究。
Moreover, the cantilever height of roof edge was artificially lowered to investigate its effect on the mean wind loads.
此外，通过降低悬挑部分的高度以研究几何参数变化对平均风荷载的影响。
Finally, The mean wind pressure coefficients of a part of typical measuring points as a function of wind direction are analysed.
最后分析了屋盖上的典型测点的平均风压系数随风向角变化的曲线。
Taking the distribution of mean wind velocity into account, the random crack growth model under variable amplitude load was established.
考虑平均风速的分布的影响，建立了随机荷载作用下的疲劳裂纹扩展模型。
Recently there has been some renewed interest in the influence that the stratospheric mean wind may have on the tropospheric circulation.
近年来，科学家们对关于平流层平均风可能对对流层环流具有的影响产生了进一步的兴趣。
The relationship between local mean wind speeds and swell significant wave heights for long period has quantitatively estimated from the superposition equation of energy.
并从能量叠加平衡方程，近似定量估计出大洋中长历时涌浪有效波高与局地平均风速的关系。
Finally, mean wind pressure coefficient of the pavilion is researched under the conditions of with and without interference. The reason of wind interference is also analyzed.
最后研究了有无干扰情况下的场馆表面平均风压系数，分析了风干扰的原因。
Evaporation from Erhai Lake decreases with the increase of total cloud cover and relative humidity, and it increases with the increase of mean wind speed and sunshine duration.
洱海水面蒸发随着总云量和相对湿度的增加而减小，随着平均风速和日照时数的增大而增大。
The mean wind energy density, mean effective wind energy density and annual available time of wind energy are calculated by using Two-Parameter Weibull Distribution function of wind speed.
采用风速的韦布尔双参数方法测算出平均风能密度、平均有效风能密度，以及年风能可利用时间。
Based on wind tunnel investigation of Yulin airport terminal old buildings, the mean wind loading, the dynamic wind loading and extreme value distribution of the large arc roof are studied.
根据榆林机场航站楼风洞试验结果，详细分析了大跨弧形屋面及弧形挑篷上的平均风荷载、脉动风荷载及其极值分布，研究了平均风荷载、脉动风荷载的分布特性。
Meteorological data mainly include the average wind speed, mean wind direction, wind standard deviation, average temperature, atmospheric pressure, rainfall, atmospheric stability parameters.
气象数据主要包含平均风速、平均风向、风向标准差、平均温度、大气压、降雨量、大气稳定度等参数。
Meteorological data mainly include the average wind speed, mean wind direction, wind standard deviation, average temperature, atmospheric pressure, rainfall, atmospheric stability parameters.
气象数据主要包含平均风速、平均风向、风向标准差、平均温度、大气压、降雨量、大气稳定度等参数。
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