Quartic exponential smoothing method can follow the nonlineartrend of time series better and can also forecast better.
布朗单一参数四次指数平滑能更好地跟踪时序的非线性变化趋势，达到更好的短期预测效果。
2
The properties, the research progress and the development trend of inorganic, organic and semi-organic nonlinear optical crystals are discussed in detail in this paper.
本文比较了无机、有机、半有机三类非线性光学晶体的性能、研究进展以及面临的主要问题和发展趋势；
3
As the length of mandrel extension increases, the trend of thinning-rate change can be failed into three stages, namely linear decrease stage, transitional stage and nonlinear increase stage.