中国春季干旱指数大多存在5 ~8年的短周期年际周期变化，12 ~13年、15 ~16年的长周年际周期变化存在于部分区域，个别区域还存在20年长周期年际周期变化。
It is proved that the drought index exists 5 ~ 8 a period in the most areas, it exists 12-13 a and 15-16 a period in some areas, it also exists 20 a period in specific area.
一次指数平滑模型充分体现了负荷连续变化的趋势性和周期性，但是没有详细考虑天气因素对负荷的影响。
Single exponent smoothness model fully embodies the characters of trend and cycle of the continuous varying power load, but it can not think about the effect of the weather elements carefully.
显示经济指标变化与经济活动总周期变化同步变化的指数。
An index of economic indicators whose movements closely coincide with the overall cycle of economic activity.
该算法考虑了RL电路中的暂态电流，假设暂态电流含有一个按正弦规律变化的周期分量和一个按指数规律变化的非周期分量。
RL circuit is taken into consideration, in which the transient current signal includes a period component varying in sinusoidal waveform and a non-period component varying in exponential waveform.
这种耦合关系在其演化周期内呈现出双指数函数的变化规律，其耦合演化轨迹是一条双指数曲线；
This kind of coupling relation takes on a double-exponential function changing law, and the evolutive track of the interaction between urbanization and eco-environment is a double-exponential curve.
此外，定义一个新的表征季节变化相对大小的指数来探讨不同自转周期下，风场季节变化相对于地球自转周期条件下的强度的相对大小。
Furthermore, a new index is defined to discuss relative seasonal change of wind at different rotation rates compared to the Earth rotation rate.
此外，定义一个新的表征季节变化相对大小的指数来探讨不同自转周期下，风场季节变化相对于地球自转周期条件下的强度的相对大小。
Furthermore, a new index is defined to discuss relative seasonal change of wind at different rotation rates compared to the Earth rotation rate.
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