The relationship between crop yield and water use of spring wheat and maize was studied using the data respectively . the results show that crop yields of spring wheat and maize hold an roughly good linear relationship with seasonal evapotranspirations respectively 5个生育阶段的作物水分响应模型由于数学结构和敏感指标的表达不同对于同一种作物的回归效果存在很大差异，表现出不同的适应性。
When researching the pick - up of image - feature , this paper pick up the parameters of whole structure configuration and put forward a method of rapid polygon approach ; after analyzed the parameter of the whole structure , the thresholds can be found ; 3 . when researched sort technology of the network of nerve , a network of nerve named art which can recognize the known disfigurement and unknown disfigurement is designed ; 4 深入研究缺陷图像的特征参数提取技术。本文利用数学结构形态学的方法对缺陷图像的整体特征参数进行了提取，并提出了一种快速多边形逼近算法?最小周长法；通过对缺陷整体特征参数的分析，找到了不同缺陷的特征参数阈值。
From the perspective of theory , it is aclassification of the large number of the portfolio models in accordance with theirinherent mathematical structure . from the perspective of calculating , it to dealwith the six separate calculations in unified basis , and enhanced computing e ? - ciency , facilitate practical application , reducing confusion that many complicatedmodels giving to investors 从理论的角度看,它是对数量众多的投资组合模型根据其内在的数学结构进行的一次分类整理;从计算的角度来看,它把六种需要各自处理的计算统一处理,提高了计算效率,便于实际应用,减少了纷乱繁杂的众多模型对投资者的迷惑。
