Coal is typical double porous medium, not pure porous medium.

The unsteady Darcy flow and the Darcy flow in composite reservoirs through porous medium, double medium and triple medium are special cases of their own.

单一介质、双重介质、三重介质非定常达西渗流及组合油藏达西渗流，只是上述问题的特殊情况。

The analysis of double porosity medium model

微循环双重介质模型分析

The Establishment of a Double-medium Selection System

利用细胞工程筛选烟草抗赤星病突变体的研究&一种双层培养基筛选系统的建立

The double porosity medium model for the mass transfer between capillary and tissue

毛细血管&组织间流体交换的双重介质模型

The theoretical study on water's driving gas displacement as for double medium of coal petrography

煤岩双重介质注水驱气渗流的理论研究

Study on percolation law of 2D porous and fractured double-medium

二维孔隙裂隙双重介质逾渗规律研究

Numerical solution of bottom water coning problems in a double porosity medium

双重孔隙介质中底水锥进问题的数值解

Based on the review of the fracture development rules in inter-bed layered fractured rock mass, the fracture network generation method was provided, and then the double medium model was introduced.

在总结缓倾状互层裂隙岩体的裂隙发育规律的基础上，给出了其裂隙网络生成方法；

The Effects of Double Dynamic Medium Frequency Electrostimulation on Nerve Conduction

双动态调幅中频电流对神经传导的影响

Measurement of Fracture and Porous Porosity in Double Medium of Daqing Oil Field by X CT Imaging Process

利用X-CT研究大庆油田双重介质裂缝和砂岩孔隙度

The fracture-hole double medium porosity mode develops distinctly in the research area, fracture and secondary bole-hole are the most important reservoir type and accumulating space for oil.

贝尔凹陷布达特群地层裂缝&孔（洞）双介质储集特征明显，裂缝和次生孔洞是布达特群潜山储集层的重要储集类型和储集空间。

Characteristics and model researches of the seepage flow in double medium karst fracture networks at Jiaozuo coal mining area

焦作矿区双重介质裂隙网络渗流与渗流模型研究

It is realized from long time asymptotic solutions that there are two steps at the pressure curve of triple medium, one step at the pressure curve of double medium, and no step at the pressure curve of porous medium.

从长时渐近解可知，三重介质的压力曲线有两个台阶，双重介质的压力曲线有一个台阶，单一介质的压力曲线没有台阶。

Double-medium Model of Gas Movement in Mining Influence Space

采动空间瓦斯运动的双重介质模型

In this paper, we consider a quadratic Lagrangian finite element equation arising from discretizations of3D elliptic problem with jump coefficients under any tetrahedral partition.

本文针对带有间断系数的三维椭圆问题，讨论任意四面体剖分下的二次拉格朗日有限元方程的代数多重网格法。

Quadratic Finite Volume Element Method Based on Optimal Stress Points for Solving Two-point Boundary Value Problems

解两点边值问题的基于应力佳点的二次有限体积元法

Calculation of Internal Forces of Elastic Structures by Using Quadratic Boundary Element Method

用二次边界单元法计算弹性结构的内力

Mises yield condition and imitate moment yield limit with an exponent curve. Taken advantage of DKT plate element and a kind of compatible quadratic plane element including vertex rotations, an ideal shell element is formed.

Mises屈服条件，并对弯矩屈服极限用一指数曲线模拟，利用DKT板元和一种带有角点转角自由度的相容二次平面元来组成一种理想的平壳元。

In this method, the whole area is divided into many quadratic isoparametric element by means of finite element method, then the contour line in each isoparametric element is generated, thus the whole contour is assembled.

该算法根据有限元法将整个区域分割成多个互相连续的二次等参单元，通过生成每个等参单元内的等值线，进而生成整个区域内的等值线。

An Algebraic Multigrid Method of Quadratic Lagrangian Finite Element Equations Under the Unstructured Quadrilateral Grids

求解非结构四边形二次拉格朗日有限元方程的代数多重网格法