projected benefit 中文意思是什麼
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Compared with the reality, it shows that this model and its parameters are defined reasonablly. to analyse the arrangement of drainage system with different spacings and depths, with unsteady flow formula and benefit index, this paper gives a two - dimensional non - linear programing model for arrangement of drainage system in the barley field, which can be solved by the method of projected gradient. by this model, we make out the optimum solution of spacings and depth of pvc pipe in littoral area of changjiang river that is s = 21. 5 8m, h = l. lm
論文通過對不同埋深、間距的塑料暗管排水布局的分析，結合非穩定流公式和效益指標，提出了麥田排水暗管布局的二維非線性規劃模型，並利用梯度投影法求解，得出長江下游濱海地區塑料排水暗管埋設的最優方案為埋深h = 1 . 1m ，間距s = 21 . 58m 。
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