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- velocity gradient field 流速梯度场
- Based on the field synergy mechanism,the relationship between velocity field and concentration gradient field of the mass transfer process in the presence of non-condensable gas was analyzed. 基于场协同机制,对强化含有不凝气体的蒸汽冷凝过程的速度场与浓度梯度场协同作用进行了理论分析,提出利用冷凝液动态行为所产生的气液界面效应来强化混合蒸汽冷凝传热特性新思路。
- In the CGT region,the relation between turbulent Reynolds stress and mean velocity gradient is nonlinear. CGT区域内雷诺应力与平均速度梯度呈非线性关系。
- Objective:To investigate the value of myocardial velocity gradient(MVG) in diagnosis of myocardial ischemia. 目的:探讨跨壁速度梯度(MVG)在诊断心肌缺血中的应用价值。
- In the CGT region, the relation between turbulent Reynolds stress and mean velocity gradient is nonlinear. 逆压梯度时，湍动能负产生率区域不复存在，此时CGT区域从有到无，也是呈 先增大后缩小的趋势，并最终消失；
- While the half angle increases, velocity gradient in a microdiffuser decreases and so does the average vorticity. 此外，受到流道内部速度梯度降低的影响，平均涡度值会随半角增加而下降。
- The magnet used for present MSS is a double-pancake type magnet with a linear gradient field distribution. 本论文研究中采用一个具有均匀磁场梯度的球型磁体,采用“双饼”绕法实现了球型磁体的绕制。
- The results showed large pressure gradient and velocity gradient of the material in the four intermeshing regions. 计算结果表明:四螺杆的四个啮合区具有较大的压力梯度、速度梯度,其混合性能明显好于双螺杆挤出机。
- Conclusion:The spatial distortion in MRI stems from the gradient field nonlinearities and magnetic field inhomogeneities and different thickness. 结论：梯度场非线性和主磁场的非均匀性以及不同扫描层厚是MRI几何失真的因素。
- The above mentioned detachment is characterized by wedge with negative velocity gradient (shown with LVL) above R1 interface between Samada and Dagyi. （2）上述拆离层在萨马达一达吉之间，以R1界面之上的负速度梯度楔状体（LVL）为特征。
- The temperature field and temperature gradient field near the crack tip during crack arresting were obtained by numerical simulation. 采用数值模拟计算了脉冲放电超快速加热时裂纹尖端温度场、温度梯度场;
- Then the authors explain hypostasis of the velocity gradient and vortex, and make a try to unify the vortex coagulation theory and the conventional coagulation theory. 从根源上解释了紊流流场中速度梯度和旋涡的产生，试图把最近发展的涡旋混凝理论与传统的混凝理论进行统一。
- The pressure gradient and velocity gradient of the extrudate in the central area were small, and the extrudate fllowed slowly in the central area, having high viscosity. 中心区的物料压力梯度和速度梯度都较小，物料在中心区流动缓慢，中心区的物料粘度值较大；
- The results show that a large velocity gradient emerges in the intermeshing region of the screw reactors, which is helpful to mix materials sufficiently. 结果表明，螺杆反应器的啮合区具有较大的速度梯度，有利于物料的充分混合。
- A computer program for calculating migration time and distance of components in arbitrary multistep gradient field capillary gel electrophoresis is compiled on the basis of the result. 以此为基础提供了任意多阶梯度场强毛细管凝胶电泳中组分的迁移时间和距离的计算公式，用于编制计算机程序。
- Secondly, the diffusion tensor field of the gray image at each pixel is calculated and applied to construct weighted gradient field, thus to create a divergence-based colorization equation. 然后计算每个像素的扩散张量，并利用这些扩散张量构造加权梯度场，从而导出基于散度的图像彩色化方程；
- Velocity|related indices derived from MPD including peak velocity of S wave, E wave and A wave, A/E and MVG (myocardial velocity gradient) were applied for the detection of WMA. For evaluation of WMA, left ventricle was divided into 20 segments. 用于室壁运动分析的 MPD速度指标为 S波、E波、A波的峰速度 ,A/ E比值及跨壁速度梯度 (MVG)。
- This paper analyses the kinematic characteristic of underwater EFP by using finite element analysis software ANSYS/LS-DYNA,and studies preliminarily the variation of the EFP's velocity gradient and shape in water with time. 本文以EFP本身为研究对象,利用有限元分析软件ANSYS/LS-DYNA对鱼雷聚能战斗部EFP在水中的运动特性作了数学仿真分析,模拟了EFP在水中运动自身的速度梯度、EFP的形状等随时间的变化,对EFP在水中运动自身的速度梯度和形状等参数随时间变化规律做了初步研究。
- The method is testing the particle sheer stress, velocity gradient at different speed of rotation by adopting different particle density and different particle diameter suspensions. 试验结果与拜格诺试验的结果完全一致，将其结果延伸，所采用的试料更加符合生产实际。
- The ratio of the magnitude of an applied shear stress to the velocity gradient that it produces; that is, a measure of a noncrystalline material's resistance to permanent deformation. 剪切应力数值与其产生应变速率的比值叫粘性,用来衡量非晶材料抵抗永久变形的能力。
