At the same time, to the volatility of copper yield rates characteristics, two types of models came to the same empirical results.
同时，对沪铜收益率的波动性特征，两类模型得出了相同的实证结果。
Through the analysis of copper time series' characteristics, we found that copper yield rate time series had peak fat-tail characteristic, volatility clustering characteristic and obvious ARCH effect.
通过对沪铜收益率时间序列特征的分析发现，沪铜收益率时间序列存在尖峰厚尾性和波动集群性，并具有明显的ARCH效应。
It will have effect on the growth and yield of crops when the copper content in soil is over a critical concentration.
当土壤中铜含量超过一定浓度时，将对作物生长发育及产量产生影响。
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