{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:AVZWT5IVC2WCKLBJ5HK7JXUN74","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":"fd3d5f59fafa3373365a119ad19c61a4dbb0f3a5a908624d15e99d78d0b42417","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2015-02-26T20:45:04Z","title_canon_sha256":"950c7c332f63517c8912440240f1c3ce17771150d700ac5215989b6562c1a302"},"schema_version":"1.0","source":{"id":"1502.07728","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.07728","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"arxiv_version","alias_value":"1502.07728v2","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.07728","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"pith_short_12","alias_value":"AVZWT5IVC2WC","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_16","alias_value":"AVZWT5IVC2WCKLBJ","created_at":"2026-05-18T12:29:10Z"},{"alias_kind":"pith_short_8","alias_value":"AVZWT5IV","created_at":"2026-05-18T12:29:10Z"}],"graph_snapshots":[{"event_id":"sha256:53889c8d79140fa84a781e88cca9b5776b42b125fcd0bd254c642a9451812bc8","target":"graph","created_at":"2026-05-18T01:19:48Z","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":"In this paper the normal collision of spherical particles is investigated. The particle interaction is modelled in a macroscopic way using the Hertzian contact force with additional linear damping. The goal of the work is to develop an efficient approximate solution of sufficient accuracy for this problem which can be used in soft-sphere collision models for Discrete Element Methods and for particle transport in viscous fluids. First, by the choice of appropriate units, the number of governing parameters of the collision process is reduced to one, which is a simple combination of known materia","authors_text":"Jochen Fr\\\"ohlich, Shouryya Ray, Tobias Kempe","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2015-02-26T20:45:04Z","title":"Efficient modelling of particle collisions using a non-linear viscoelastic contact force"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.07728","kind":"arxiv","version":2},"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":"sha256:6967b233d3d37c6f1e81dfb1bceb55e39950588f0340d29835c43be4779af4be","target":"record","created_at":"2026-05-18T01:19:48Z","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":"fd3d5f59fafa3373365a119ad19c61a4dbb0f3a5a908624d15e99d78d0b42417","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2015-02-26T20:45:04Z","title_canon_sha256":"950c7c332f63517c8912440240f1c3ce17771150d700ac5215989b6562c1a302"},"schema_version":"1.0","source":{"id":"1502.07728","kind":"arxiv","version":2}},"canonical_sha256":"057369f51516ac252c29e9d5f4de8dff24d46d9ec9fb5a0b9132cc4cb5a5f1a7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"057369f51516ac252c29e9d5f4de8dff24d46d9ec9fb5a0b9132cc4cb5a5f1a7","first_computed_at":"2026-05-18T01:19:48.592302Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:48.592302Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jd8zRs0bH5H5bBvepL2V5qAKozY1LTCxmJ0soviFa13oemjalBVx684aI/wrQz+0eGcKPNAVMzMBNO9tYm2gBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:48.592730Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.07728","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6967b233d3d37c6f1e81dfb1bceb55e39950588f0340d29835c43be4779af4be","sha256:53889c8d79140fa84a781e88cca9b5776b42b125fcd0bd254c642a9451812bc8"],"state_sha256":"57072dc5d4ebec5c9b55fa3764c1b708ad9e8d89bea4906fa8ef6f3f4be13686"}