海量图书期刊资源，随时随地畅享阅读乐趣
A Photoelectric Method of Timing Freely Falling ParticlesChristiansen, E. B.; Barker, Dee H. · Review of Scientific Instruments · 1952
The effect of shape and density on the free settling of particles at high Reynolds numbersE. B. Christiansen; Dee H. Barker · 1965