{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:GBB7763LW3E4D2SWQL4CMEJD2N","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"d69eef05b4227ffd1bf0712bdb01ed3a9a1d7e8b5d68abee42615d04b71c48e8","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2008-11-28T15:50:17Z","title_canon_sha256":"bd9d9278ce412baade5e98ceb2a10ed8dc81fa38f8c973073a583bb72aa71e9a"},"schema_version":"1.0","source":{"id":"0811.4729","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0811.4729","created_at":"2026-05-18T02:15:12Z"},{"alias_kind":"arxiv_version","alias_value":"0811.4729v1","created_at":"2026-05-18T02:15:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0811.4729","created_at":"2026-05-18T02:15:12Z"},{"alias_kind":"pith_short_12","alias_value":"GBB7763LW3E4","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"GBB7763LW3E4D2SW","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"GBB7763L","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:14d360771645bd047fa49354fe41a3121587b7fc66bf57537746038b59bea424","target":"graph","created_at":"2026-05-18T02:15:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The dependence of the barchan dune dynamics on the size of the grains involved is investigated experimentally. Downsized barchan dune slices are observed in a narrow water flow tube. The relaxation time from an initial symmetric triangular heap towards an asymmetric shape attractor increases with dune mass and decreases with grain size. The dune velocity increases with grain size. In contrast, the velocity scaling and the shape of the barchan dune is independent of the size of the grains.","authors_text":"C. Groh, C. Kruelle, I. Rehberg, N. Aksel","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2008-11-28T15:50:17Z","title":"Grain size dependence of barchan dune dynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0811.4729","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:fb351944759bc40f32c4aeeb634e7b6da5a24da4c4140ca4a8647982df4fbd40","target":"record","created_at":"2026-05-18T02:15:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"d69eef05b4227ffd1bf0712bdb01ed3a9a1d7e8b5d68abee42615d04b71c48e8","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2008-11-28T15:50:17Z","title_canon_sha256":"bd9d9278ce412baade5e98ceb2a10ed8dc81fa38f8c973073a583bb72aa71e9a"},"schema_version":"1.0","source":{"id":"0811.4729","kind":"arxiv","version":1}},"canonical_sha256":"3043fffb6bb6c9c1ea5682f8261123d35250dc39e7169f8d0e0648a1618eca90","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3043fffb6bb6c9c1ea5682f8261123d35250dc39e7169f8d0e0648a1618eca90","first_computed_at":"2026-05-18T02:15:12.671493Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:12.671493Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TOmTQ+lFT1OWQuKTIY67Ftq2CFI/ncc7/ll1Nif3T/t5NquMN3vlbbTQftSH2Lg6MaOfowaDPrKQUS2i7Y3hCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:12.671928Z","signed_message":"canonical_sha256_bytes"},"source_id":"0811.4729","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fb351944759bc40f32c4aeeb634e7b6da5a24da4c4140ca4a8647982df4fbd40","sha256:14d360771645bd047fa49354fe41a3121587b7fc66bf57537746038b59bea424"],"state_sha256":"e842f9b1793d5efa1fdf1af3794e7e5bc7e5940d9a49d584c9e13e0f2d2fed8e"}