{
  "annotation_id": "4770c12d-ab38-4571-b4f4-18533ffc04f4",
  "date_created": "2026-03-02T18:01:00.711000Z",
  "date_modified": "2026-03-02T18:01:00.711000Z",
  "file_hash": "3816d3c4542e6dbc615bdfd35027acf8e39f30dba220aa8792288176a5f2e042",
  "private": false,
  "record": {
    "abstract": "The power spectrum of displacement fluctuation of beads in the air-fluidized\ngranular system is measured by a novel NMR technique of modulated gradient\nspin-echo. The results of measurement together with the related spectrum of the\nvelocity fluctuation autocorrelation function fit well to an empiric formula\nbased on to the model of bead caging between nearest neighbours; the cage\nbreaks up after a few collisions \\cite{Menon1}. The fit yields the\ncharacteristic collision time, the size of bead caging and the diffusion-like\nconstant for different degrees of system fluidization. The resulting mean\nsquared displacement increases proportionally to the second power of time in\nthe short-time ballistic regime and increases linearly with time in the\nlong-time diffusion regime as already confirmed by other experiments and\nsimulations.",
    "arxiv_id": "physics/0505214",
    "authors": [
      "Janez Stepisnik",
      "Samo Lasic",
      "Igor Sersa",
      "Ales Mohoric",
      "Gorazd Planinsic"
    ],
    "categories": [
      "physics.flu-dyn",
      "physics.gen-ph"
    ],
    "doi": "10.1209/epl/i2006-10193-6",
    "journal_ref": "Europhys. Lett., 75 (6), pp. 887-893 (2006)",
    "title": "Dynamics of Air-Fluidized Granular System Measured by the Modulated   Gradient Spin-echo",
    "url": "https://arxiv.org/abs/physics/0505214"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "79324774-b6a4-4ef4-ad63-6d246ab7a0a1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}