评述了光抽运和自旋交换碰撞中角动量转移和损失的物理。

This article reviews the physics of angular momentum transfer and loss in optical pumping and spin-exchanging collisions.

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最后，提出了因自旋交换碰撞和自旋销毁碰撞引起的极化原子的自旋弛豫。

Finally, spin relaxation of polarized atom due to spin-exchange collisions and spin-destruction collisions is put forward.

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本文运用基于颗粒动理学理论的欧拉-欧拉气固多相流模型，考虑颗粒自旋转流动对颗粒碰撞能量交换和耗散的影响，数值模拟流化床内气体颗粒两相流动特性。

Numerical analyses of effect of particle rotation on gas and particles flow behavior were performed using two-fluid flow model combining with the kinetic theory of granular flow.

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