块金值,函数参数之一。块金值(Nugget)用Co表示:也叫块金方差,反映的是最小抽样尺度以下变量的变异性及测量误差。理论上当采样点的距离为0时,半变异函数值应为0,但由于存在测量误差和空间变异,使得两采样点非常接近时,它们的半变异函数值不为0,即存在块金值。测量误差是仪器内在误差引起的,空间变异是自然现象在一定空间范围内的变化。它们任意一方或两者共同作用产生了块金值。是由实验误差和小于实际取样尺度引起的变异.表示随机部分的空间异质性。
论文还简要研究了块金值对搜索域范围的影响。
The dissertation also briefly discusses how the nugget value affects on search domain.
容重和萎蔫含水量的块金值都很小,尤其是萎蔫含水量在各层的块金值都相等,含水量的块金值随剖面深度而降低。
The nuggets of bulk density and wilting point are very tow, and the nugget of soil water content is decreased with depth.
更少有人知道的是,在他手里,当年只值30块人民币的几张《小马过河》画稿,如今却成为了产值过亿元的“金饽饽”。
Even fewer people know is that, in his hands, then only the value of 30 yuan for a few "Xiaomaguohe" drawings, but now it has become a billion value of the "gold cake."
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