Near some sprites, the team also found radio waves in 310-mile-wide (500-kilometer-wide) bands-and these radio waves were most likely being emitted by high-speedparticle beams.
The velocity field measurement by use of the particle image velocimetry and particle tracking velocimetry ( PIV/PTV) system in a tidal estuary model test has advantages of highspeed and accuracy.
在潮汐河口河工模型试验中采用粒子测速（PIV/PTV）系统测量流场，具有快速、精度高的优点。
3
The feature of explosion signals in elastic-plastic region of rocks is in the state of high pressure, of highspeed, and of transient action on the particle motion.