1) quadratic gradient
二次梯度
1.
According to the assumption of slightly compressible fluid,the quadratic gradient term in nonlinear partial differential equation of the traditional well test models for liquid flow is usually neglected.
在传统试井模型的非线性偏微分方程中根据弱可压缩流体的假设,忽略了二次梯度项,对于低渗透油藏这种方法是有疑问的。
2.
According to assumption of slightly compressible fluid, the quadratic gradient term in nonlinear partial differential equation is usually neglected.
在非线性偏微分方程中根据弱可压缩液体的假设忽略了二次梯度项，对于混气石油和低渗透储层这种方法是有疑问的，我们已经知道在试井较长时间忽略二次梯度项将产生误差。
2) quadratic gradient term
二次梯度项
1.
According to the assumption of slightly compressible fluid,neglected the quadratic gradient term in nonlin- ear partial differential equation is usually lead to error.
在非线性偏微分方程中,根据弱可压缩液体的假设,忽略二次梯度项,在试井较长时间内将产生误差。
3) Quadratic-gradient term
二次梯度项
1.
The quadratic-gradient term was not neglected in this model,which results in more accurate conclusion.
针对缝洞型油藏提出了一种由基岩系统、裂缝系统及溶洞系统组成的三孔三渗数学模型,它考虑了井筒储集和表皮效应的影响,同时,在建立模型的时候没有忽略二次梯度项,使计算结果更加精确。
4) quadratic pressure gradient
二次压力梯度
1.
Embarking from the mass conservation principle and the Darcy′s law, the flow equation of the elastic porous medium and the slightly compressible single phase fluid are deduced with the quadratic pressure gradient for constant compressibility and isothermal flow.
从质量守恒原理出发,结合达西定律,考虑恒压缩系数的弹性多孔介质和单相微可压缩液体的等温渗流过程,推导出了考虑二次压力梯度影响的渗流方程。
5) Secondary gradient crystallization
二次梯度结晶
6) subgradient
次梯度
1.
(h,φ)-directional Derivative and(h,φ)-subgradient;
(h,φ)-方向导数与(h,φ)-次梯度
2.
A simplified method for computing the subgradients of the norm ‖Bx‖_p;
范数‖Bx‖_p的次梯度的一种简洁求法
3.
(h,φ)-η subgradient and its application to non-smooth(h,φ)-semi-infinite programming problems
(h,φ)-η次梯度及其在非光滑(h,φ)-半无限规划中的应用
补充资料：输出反馈(见线性二次型次优控制)
输出反馈(见线性二次型次优控制)
output feedback
3h日c卜口fon以以{输出反馈型次优控制。(output王eedbaek)见线性二次
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