Based on the grey system theory, a grey assessment model of groundwater quality is built by combining the method of grey relational grade analysis and the method of single factor contaminant index.
以灰色系统理论为基础，把灰色关联度分析方法和单因子污染指数法相结合，构造了一种适合于评价地下水质量的灰色模型。
Through improving the single factor or multifactor to influence the harmony degree to probe which can influence the harmony degree in theory.
通过在理论上对各构成要素的敏感性分析，表明单因素或多因素的改进对和谐度是有影响的。
The new criterion includes the integral features of the whole field, while the theory of minimum strain-energy-density factor considers only a single point in the crack tip field.
较之仅着眼于纹尖场某一点的最小应变能密度因子理论，新判据更多地顾及到了尖端场的全局。
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