Based on the three prediction models , the combined forecast is conducted using the separate solutions of moving average , exponential smoothing and gray prediction to investigate whether the combined forecast model matches the sales volume prediction of truck wooden boxes 最后采用組合預(yù)測之三種預(yù)測模型,將移動平均法、指數(shù)平滑法、灰預(yù)測法所求得之解作組合預(yù)測,以探討組合預(yù)測模型是否適合木制框式車身的銷售數(shù)量預(yù)測。
Culture solution of hydrodictyon reticulatum has been separated with membrance of 0 . 2um , 0 . 45um , and then microalgae is cultured with the separated solution . the results show that the mechanism that hydrodictyon reticulatum restrains microalgae is closely related to the chemical interference to microalgae from biometabolism of hydrodictyon reticulatum besides their resource competition . we also find that there are two main functional substances in permeated solution with membrance of 0 . 45um , one substance is beneficial to other algae , the other can restrain growth of algae 水體富營養(yǎng)化藻類資源竟?fàn)幣c種群演替規(guī)律的初探中文提要通過用0 . 20以m , 0 . 45林m膜對水網(wǎng)藻培養(yǎng)液的分離,再分別用分離液來馴化、培養(yǎng)微藻,結(jié)果發(fā)現(xiàn),水網(wǎng)藻對微藻的抑制機理除與之進行資源競爭外,還與水網(wǎng)藻的生物代謝物對微藻的化學(xué)干預(yù)作用密切有關(guān)。