摘要
通过对物体沿曲面下滑过程中克服摩擦力做功的分析、计算，指出了曲面性质对物体下滑速度的影响．
An indoor warning system which has small volume and highquality is devoloped by combining the rotary hologram disk and computer technique. In the warning area (about 10m 2),this system can quickly detect the existance and movement of some people.
出处
《河南大学学报（自然科学版）》
CAS
1997年第2期27-29,共3页
Journal of Henan University:Natural Science
关键词
曲率半径
法向平衡状态
摩擦力
功
曲面
rotary hologram disk
warning
luminous intersity multiplicate conical surface.
