The radio wave propagation velocity is slowed and the ray producing bend but to the asymmetry of the atmospheric medium, the refraction error is produced.
由于空中大气介质的不均匀性使得电波传播速度减慢射线产生弯曲，从而产生折射误差。
2
Flash X-ray machines have been used as tools for studies of detonation physics and high velocity motion process.
闪光x射线机是研究爆轰物理过程及其它高速瞬变过程的重要工具。
3
A rapid and accurate method for two point ray tracing in horizontally layered velocity model is presented in this paper.