billiard

Lubricant used in the ball groove rolling sliding contact pair of a heavy load tracked vehicle is a lithium base grease which is waterproof and heat-resistant.

某型重载车辆主离合器分离弹子槽使用锂基润滑脂作为润滑剂,使用过程中,由于外界的沙石、灰尘等很容易进入润滑脂中成为磨料而导致早期的三体磨损失效。

Quantum wave packet analysis in the rectangular billiard;

矩形弹子球中的量子波包分析(英文)

Quantum spectra and classical periodic orbits in a rectangular billiard;

矩形弹子球中的量子谱和经典周期轨道(英文)

The article analyzes the reasons and affecting elements for the traces left by duplicate keys compared with the traces left in spring locks by original keys , thus does some research in distinguishing unlocking traces.

本文通过对原配钥匙与后配钥匙在弹子锁内形成痕迹的比较,分析了后配钥匙形成痕迹的原因及影响因素,为正确认识开锁痕迹作了一定的探索。