Comparison show the swap 2 . 0 is an attractive and effective tool to obtain evapotranspiration for the study of relationship between crop yield and water use . a model of crop response to water based on bp neural network for spring wheat was developed using deficit irrigation experiment data 本文依据人工神经网络的基本原理在充分吸收其最新理论研究成果的基础上，以非充分灌溉试验得到的实测春小麦产量和各生育阶段水分资料为样本建立了基于bp神经网络的春小麦作物水分响应模型。
On the base of var . analysis significance of the experimental treatment , we investigated crop response to water - salt stress regularity , studied the quantity relationship about crop yield and soil water and salt , established a function about them referring to blank and jense water model . conclusions as follows : ( 1 ) the effect of germinating time and rate emergence are different in soil with different salt content , and limited seriously in heavy saline soil 在方差分析确认试验处理显著的基础上，对作物生理生育指标（株高、茎粗、叶片数、花盘直径、干物质量、叶水势、籽实产量）进行统计分析探索作物水盐响应规律；研究作物产量与土壤水分盐分联合作用的定量关系，参照水分的blank加法和jense乘法模型结构，建立作物水盐响应模型。
On account of the uncertainty existing in the nonlinear ship responded model , we design a dynamic adaptive ship steering controller by using adaptive backstepping . after deducing the update law of the unknown constant , we choose the controller gains to guarantee the closed loop system and the control signal global boundedness 由于船舶非线性响应模型中含有未知常参数的不确定项，因此采用自适应backstepping的方法，选择参数自适应调节律，设计动态的船舶航向控制器，实现在线控制。
It can reflect soil water stress and salt stress . ( 6 ) choosing soil solution relative concentration as suitable variable established a funct - ion about crop relative yield , soil water and salt . using the way of testing model with actual data to valid its higher precision , it can reflect the relationship of crop yield , soil water and salt , and be considered as reference in water saving irrigation management （ 6 ）选取试验条件下的适宜自变量-土壤溶液相对浓度建立作物相对产量与土壤水分盐分水盐响应模型，通过实测资料检验确认模型具有较高的精度，可以较准确地揭示作物产量与土壤水分盐分的量化关系，为含盐土壤的节水灌溉研究提供了一定的基础研究，可供灌溉规划管理参考。
The dynamic matrix control algorithms based on finite impulse response are studied . the model errors are defined in the form of upper and lower bound and the error square sum of impulse response coefficients of single - input / single - output systems . the robust stability conditions are proposed for closed - loop systems using dmc in the form of lmi , which can assure the closed - loop system using dmc algorithm to be asymptotically stable , when the coefficients of characteristic polynomial do n ' t satisfy jury ' s dominant coefficient lemma 浙江大学博士学位论文4 .研究了基于脉冲响应模型的动态矩阵预测控制田mc )算法，针对单输入、单输出系统可能出现的预测模型误差，分别以脉冲响应系数上下界和脉冲响应系数误差平方和的形式对预测模型的模型误差进行定义，根据该定义以线性矩阵不等式的形式分别提出了闭环系统鲁棒稳定判据，当闭环多项式系数不能满足j切叹主系数定理的情况下仍能保证系统闭环稳定。
The main content of the fourt h chapter is math model , includes ship movement equation model , movement responding model , ship transfer excursion model , wind and current floating excursion calculating model , the occupying fairway width calculating model for determining voyage and so on 第四章为数学模型研究，主要的数学模型有：船舶运动方程模型、武汉理工大学硕士学位论文运动响应模型、船舶偏移量模型、风流致船舶漂移量的计算模型、定距离船舶航行所占航宽模型。
