Grain-size characteristics and transport trend of surficial sediment in Huiquan Bay beach in Qingdao;

Abstracting trend component of dam observation data based on wavelet analysis;

This paper introduces the major mathematic models of synthetic prediction of crop yield, including separation of trend factor and trend yield,simulation of trend yield;,extension of trend yield;,prediction of fluctuating yield, revision of predicting errors, multi-result s synthetic integration .

The results showed that: the multinomial methods was more appropriate to separate the trend yield, and the yield of waxberry had close relationship with some climate factors of flower Suds period and autumn period, such as precipitation and temperature.