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jensen model
相关语句
  jensen模型
    New definition and computation on the water sensitive index in Jensen model
    Jensen模型水分敏感指数的新定义及其解法
短句来源
    Determination Method for Relational Parameter in Jensen Model of Water Production Function in Different Years
    作物水分生产函数Jensen模型中有关参数在年际间确定方法
短句来源
    This paper introduces Gauss-Newton method and uses it to calculate the parameters of Jensen model of crop water production function.
    介绍了高斯 牛顿法,并把它用于作物水分生产函数Jensen模型参数求解,该方法可使拟合结果逼近无偏估计,从而提高拟合的精度。
短句来源
    Combining crop water production function model in whole growing season and different phase, this paper presented determination method for relational parameter in Jensen model of crop water production function in different years. The example calculation result shows that this method has low error and can be used in non-sufficient irrigation research .
    将作物全生育期水分生产函数模型和分阶段水分生产函数模型结合起来应用,提出了作物水分生产函数Jensen模型中有关参数在年际间确定方法,并采用豫东开封惠北灌溉试验站资料进行了实例计算,结果表明,该计算方法误差小,可在非充分灌溉研究中运用。
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  jensen model
In this study a function for transformingthe readily available yield response factors of Doorenbos andKassam's model to the sensitivity index of Jensen model isderived.
      


In the past research, the water sensitive indexes greatly depend on the partition of the growing stages To solve the problem, the Jensen model is rebuilt and the water sensitive index is redefined A terse new method computing the water sensitive index is introduced according as the water sensitive indexes are able to accumulate The practical field experiment validates that the new method is well consistent with the old those 

在总结已有的作物水分生产函数Jensen模型研究工作的基础上,针对以往研究中水分敏感指数与生育阶段划分密切相关的问题,对Jensen模型进行了改造,提出了水分敏感指数的新定义。并在Jensen模型水分敏感指数的累加性分析的基础上,提出了确定Jensen模型水分敏感指数及累积曲线的更为简洁的新方法,新方法得到了田间试验的验证并与传统方法有很好的一致性。

Combining crop water production function model in whole growing season and different phase, this paper presented determination method for relational parameter in Jensen model of crop water production function in different years. The example calculation result shows that this method has low error and can be used in non-sufficient irrigation research .

 将作物全生育期水分生产函数模型和分阶段水分生产函数模型结合起来应用,提出了作物水分生产函数Jensen模型中有关参数在年际间确定方法,并采用豫东开封惠北灌溉试验站资料进行了实例计算,结果表明,该计算方法误差小,可在非充分灌溉研究中运用。

The present calculation method for parameters of nonlinear model of crop water production function is firstly using variable substitution to convert it into linear model, and then using least square method to calculate it. However, the estimation value of parameter achieved by using this method is not unbiased ,so the regressive function is not optimal and the correlative coefficient can not measure the performance of fitting efficiently. This paper introduces Gauss-Newton method and uses it to calculate...

The present calculation method for parameters of nonlinear model of crop water production function is firstly using variable substitution to convert it into linear model, and then using least square method to calculate it. However, the estimation value of parameter achieved by using this method is not unbiased ,so the regressive function is not optimal and the correlative coefficient can not measure the performance of fitting efficiently. This paper introduces Gauss-Newton method and uses it to calculate the parameters of Jensen model of crop water production function. The result by using this method is nearly unbiased, the fitting precision is enhanced and the correlative coefficient of original model presented can measure the performance of fitting more efficiently.

对于作物水分生产函数的非线性模型,现有参数求解方法是先采用变量代换使模型线性化后再用最小二乘法求解。用这种方法得到的参数估计值并不是无偏估计,因而回归方程也不是最优的,相应相关系数也不能很好地反映拟合的显著性水平。介绍了高斯 牛顿法,并把它用于作物水分生产函数Jensen模型参数求解,该方法可使拟合结果逼近无偏估计,从而提高拟合的精度。同时,给出的未经线性化模型的相关系数更能反映拟合的显著性水平。

 
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