Periodic and disordered structures in a modulated gas-driven granular layer.

@article{Li2003PeriodicAD,
  title={Periodic and disordered structures in a modulated gas-driven granular layer.},
  author={J. F. Li and Igor Aranson and W. K. Kwok and Lev S. Tsimring},
  journal={Physical review letters},
  year={2003},
  volume={90 13},
  pages={134301}
}
Experiments with a thin gas-fluidized granular layer revealed a sequence of well-defined transitions as the amplitude and frequency of the gas flow modulation are varied. The observed patterns include subharmonic squares and stripes, quasiperiodic and disordered structures. The wavelength of subharmonic patterns increases with the mean flow rate and decreases with the modulation frequency. 

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