It is found that the canonical momentum is directly proportional to the gradient of space phase.
发现正则动量与空间相的梯度成正比。
2
Strong two dimensional effect on the field penetrating speed should be included in the fluid analysis for a plasma space distribution with high density gradient.
对于等离子体空间分布存在较大的密度梯度的物理问题，必须考虑二维空间特性对磁场渗透速度的影响。
3
We may assume that there is no correlation between the local velocity of a liquid particle at a mathematical point inside the void space and the concentration gradient.