1) 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。
2) ADC value
表观弥散系数值
1.
DWI signal and ADC value were evaluated in cerebratis stage,capsule formation stage,and evolution stage of brain abscess and compared with those.
目的研究磁共振弥散加权像及表观弥散系数值在鉴别脑脓肿与坏死囊变脑转移瘤中的应用价值。
3) apparent diffusion coefficient value
表面弥散系数值
4) fractional anisotropy and mean diffusivity
弥散值
5) numerical solution / diffuse approximation
数值逼近/弥散方法
6) diffuse function
弥散函数
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)/ΔbS1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。
参考词条