angular-momentum conservation角动量守恒
angular r momentum balance动量矩平衡
angular-momentum projected角动量投影
angular r momentum transfer角动量转移
angular-momentum coupling角动量耦合
Angular rotational momentum角动量
angular r momentum conservation law角动量守恒定律
angular r momentum quantum number角量子数
The reasons of the secular decrease may be caused by the mass transfer between the two components or/and angular momentum loss from the system.
轨道周期减小可能是因为物质由主子星转移到次子星或系统角动量损失所至，而周期性的变化可能是由系统子星间的磁活动周或第三天体的光时效应引起。
参考来源 - 近相接型密近双星的观测研究The angular momentum distributions and their propagation evaluation characteristics of optical vortices,especially vortices with the complicated topological structure,which are difficult to measure accurately through an experiment,can be obtained by numerical computation.
对于光学涡旋特别是具有复杂拓扑结构的光学涡旋,可以通过数值计算的方法获得实验上难以准确测量的角动量分布及其传输演化特性。
参考来源 - 光学涡旋横向线动量密度的传输演化特性N（名词） a property of a mass or system of masses turning about some fixed point; it is conserved in the absence of the action of external forces 角动量