用质心坐标系分析了二体问题的运动方程，并用质心系讨论了两个粒子间的弹性碰撞问题。
This paper analyses the two body problem of kinematical equation and discusses the elastic collision between two particles in the center of mass system.
通过把实验数据从实验室坐标系转化到质心坐标系，得到反应产物在不同质心角度下的平动能分布和角度分布。
Data measured in the laboratory frame were converted to that in the center-of-mass frame to obtain product kinetic energy distributions and angular distributions in the center-of-mass frame.
它也包含了月球对地月质心的摄动和采用各向同性的标准坐标系表示的相对摄动。
It also contains the perturbations of the Moon onto the earth-moon barycenter and the relativistic perturbations expressed in isotropic and standard coordinates.
微粒的角动量，质心分离以及相对坐标系，有效能量图。
Angular momentum for particles, separation of center-of-mass and relative coordinates, effective energy diagram.
在实验室坐标系下，给出吸能核反应所要求的阈能，其结果与质心系下得到的结果完全一致。
The threshold energy formula of nuclear reaction in which energy is absorbed is obtained using laboratory frame. It is consistent with the result obtained in mass center frame.
在实验室坐标系下，给出吸能核反应所要求的阈能，其结果与质心系下得到的结果完全一致。
The threshold energy formula of nuclear reaction in which energy is absorbed is obtained using laboratory frame. It is consistent with the result obtained in mass center frame.
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