stepwise reduction 中文意思是什麼
stepwise reduction
解釋
分段還原-
In this paper, based on the soil water infiltration multifactorial influence tests with three species of soil texture and different husbandry condition and monofactorial influence tests with four species of soil texture in indoor, the basic infiltration characteristics, reduction infiltration mechanism and various factors are studied systematically. major factors influencing soil infiltration characteristics, resilience between influence factors and soil water infiltration parameter and influence priority are analyzed by mathematics statistics method, stepwise regression models with multiple units of soil water infiltration parameters are build up and verified
本文基於大田三種質地、不同耕作條件下土壤水分入滲的多因素影響試驗和室內四種質地土壤條件下的單因素影響試驗，系統地研究了土壤水分入滲特性的變化過程，阻滲機理和影響土壤水分入滲特性的各種因素，藉助數理統計方法分析影響土壤水分入滲特性的主要因素，各影響因素與土壤水分入滲參數間的相關性及其影響的先後次序。建立、驗證了土壤水分入滲參數的多元逐步回歸模型。 -
In the second chapter some problems for degree reduction of bezier curves and surfaces are studied. in this chapter, degree reduction of bezier curves with points constraints is proposed and the new approach of constrained optimization is brought in light. the stepwise method for degree reduction of rectangular bezier surfaces is further discussed
第二章研究b zier曲線曲面的降階逼近問題，在這一章中，提出了b zier曲線的點約束降階逼近新問題，並給出了約束優化方法；討論了張量積b zier曲面的逐步降階逼近新方法，此方法的優點是直接利用b zier曲線的降階逼近方法解決張量積b zier曲面的降階逼近問題。
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