Based on the fact that all particles in convective air columns must be lifted in the development process of convection, an average buoyant force of these lifted particles is considered in deriving a mean unstable energy index for convective forecasting which is convenient for practical use in forecasting. 本文考虑了整个对流气柱内上升气块的浮力的平均效应,从而推导出一个便于日常作对流预报用的平均不稳定能量指标S(H)。
The rally in metals has also lifted sentiment towards the mining industry, with the FTSE European mining index rising 17.4 per cent since the start of the year. 金属价格上涨也提升了矿业的市场人气,富时(ftse)欧洲矿业指数自今年年初已上涨了17.4%。