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1)  dispersion parameter
弥散参数
1.
A dispersion test is carried out in field in order to get the dispersion parameters of the shallow aquifer.
通过现场弥散试验测定浅层含水层的水动力弥散参数,用有限分析法模型模拟弥散试验场,为建立滨州市浅层地下水溶质运移模型提供依据。
2.
The finding of dispersion parameter is a prerequisite to recognize correctly the pollutant migration of underground water and its control.
弥散参数的求得,是正确认识地下水污染运移及对其控制的前提。
2)  hydrodynamic dispersion parameter
水动力弥散参数
3)  diffuse function
弥散函数
4)  dispersive coefficient
弥散系数
1.
The simulative results indicate that the velocity of groundwater and the retardation coefficient are the key factors influencing the transport of MTBE in subsurface,whereas the dispersive coefficient has no obvious effect on it.
模拟结果表明,地下水流速和阻滞系数对于MTBE的运移过程影响最为显著,而水动力弥散系数的影响较小,忽略其变化不会对预测地下水环境中污染物运移的环境动力学行为造成太大误差。
5)  numerical dispersion
数值弥散
1.
The authors use an operator split upwind equalization scheme for overcoming the numerical dispersion and oscillation problems appeared in water pollution simulations problems where the convection is dominated.
各种常见的数值解法在以对流为主溶质运移问题的求解中都会遇到困难,如用有限单元法或有限差分法时,会产生数值弥散与过量这两类误差。
2.
Then this paper studied the effect of diffusion coefficient on concentration distribution and the conditions of substitution with numerical dispersion for physical diffusion.
本文通过求一对流-扩散方程的半解析解,分析了扩散系数大小及影响扩散系数的参数对计算出的浓度分布的影响;通过将该半解析解与忽略扩散的数值解进行对比分析,讨论了数值弥散代替物理扩散的条件。
3.
Influences of reservoir heterogeneity and dip angle on unstable-state displacement of gas flooding in an oil field have been studied through numerical simulation,adopting dimensionless quantity batch and high-density grid eliminating numerical dispersion techniques,which could identify multiple phase flow patterns.
应用标定多相流态的无因次量组及高密度网格消除数值弥散技术,采用数值模拟方法研究了针对矿场规模的注气驱替中非均质程度、倾角数对非稳态驱替动态的影响。
6)  dispersion coefficient
弥散系数
1.
An iterature method of the inverse problem for the dispersion coefficient in water quality model;
河流水质纵向弥散系数反问题的迭代算法
2.
The porosity,permeability coefficient,specific yield and dispersion coefficient of 29 kg of coral sand collected from the Xisha Islands were examined using the conventional methods.
从西沙群岛采集了29 kg珊瑚砂样,采用常规方法测定了珊瑚砂的孔隙度、渗透系数、给水度以及弥散系数。
3.
The dispersion coefficients of electrolyte solute in flow of different slope and sediment concentration are calculated using the mathematical model of electrolyte pulse transferring in laminar flow.
利用坡面薄层水流的电解质脉冲数学模型,计算了不同坡度和含沙量下的电解质弥散系数,发现在泥沙含量较低时,弥散系数与水流速度有较好的线性相关性,但泥沙含量较高时,泥沙含量对弥散系数作用更加强烈,弥散系数与速度的相关性较差,说明弥散系数受泥沙含量和水流速度影响,但三者的关系函数有待于进一步探讨。
补充资料:表观弥散系数


表观弥散系数


磁共振成像术语。磁共振弥散成像中应用的参数之一。ADC为代表使用与不使用弥散梯度时兴趣区信号强度的比值,可用下式计算:ADC=(InS2-InS1)/ΔbS1为使用弥散梯度时兴趣区的信号强度,S2为不使用弥散梯度时兴趣区的信号强度,Δb为使用与不使用弥散敏化梯度时b值的差。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
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