... x z y x dP dP P P P E W , , 式中， (P x , P y , P z )是电子的动量密度(momentum density)，如果动量分布是各向同性的，该方程可 简写成： dP P P E W y P 2 式中， 2 2 2 2 z y x P P P P ...
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momentum density tensor 动量密度张量
angular momentum density 角动量密度
field momentum density 场动量密度
electromagnetic field momentum density 称为电磁场动量密度
the momentum density 动量密度
electron momentum density 电子动量密度
orbital angular momentum density 轨道角动量密度
distribution of angular momentum density 角动量密度分布
momentum flow density [力] 动量流密度
We show that the rearrangement contribution of TBF to neutron and proton single-particle potentials is repulsive and increases rapidly with increasing density and momentum.
结果表明：三体核力重排效应对质子和中子单核子势均具有排斥性，而且其贡献随动量和密度增加而迅速增大。
The symmetry potential turns out to depend strongly on both momentum and density, while it is almost independent of the isospin asymmetry.
结果表明同位旋对称势对于同位旋非对称度的依赖性很弱，但对于动量和密度均有较强的依赖性。
The equations of axial momentum and radial momentum are made during the presented inflation of parachute, and the parachute opening load in low atmospheric density is studied on the basis of them.
文章根据建立的降落伞充气过程中轴向和径向动量方程，研究了低密度大气中降落伞的开伞动载。
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