{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:WSAG6MY7KPTYZN7Z5W3DF7L7TF","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":"dcb6d94bf71af040866c693e77eb3e027321e982dfe9574d9afef4a5e4f736f6","cross_cats_sorted":["cs.AI","cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-05-06T10:16:04Z","title_canon_sha256":"109b765a8dbcb502f885a3e9deed65dd28e30d03b115bed670ad07590ff0acb8"},"schema_version":"1.0","source":{"id":"2306.05554","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2306.05554","created_at":"2026-07-05T06:50:55Z"},{"alias_kind":"arxiv_version","alias_value":"2306.05554v3","created_at":"2026-07-05T06:50:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2306.05554","created_at":"2026-07-05T06:50:55Z"},{"alias_kind":"pith_short_12","alias_value":"WSAG6MY7KPTY","created_at":"2026-07-05T06:50:55Z"},{"alias_kind":"pith_short_16","alias_value":"WSAG6MY7KPTYZN7Z","created_at":"2026-07-05T06:50:55Z"},{"alias_kind":"pith_short_8","alias_value":"WSAG6MY7","created_at":"2026-07-05T06:50:55Z"}],"graph_snapshots":[{"event_id":"sha256:7e4d208f169343781785f40f82cf62a6e7f09714ecd693c31d77379681535965","target":"graph","created_at":"2026-07-05T06:50:55Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2306.05554/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The application of Physics-Informed Neural Networks (PINNs) is investigated for the first time in solving the one-dimensional Countercurrent spontaneous imbibition (COUCSI) problem at both early and late time (i.e., before and after the imbibition front meets the no-flow boundary). We introduce utilization of Change-of-Variables as a technique for improving performance of PINNs. We formulated the COUCSI problem in three equivalent forms by changing the independent variables. The first describes saturation as function of normalized position X and time T; the second as function of X and Y=T^0.5;","authors_text":"Jassem Abbasi, P{\\aa}l {\\O}steb{\\o} Andersen","cross_cats":["cs.AI","cs.LG"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-05-06T10:16:04Z","title":"Simulation and Prediction of Countercurrent Spontaneous Imbibition at Early and Late Times Using Physics-Informed Neural Networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2306.05554","kind":"arxiv","version":3},"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:e4c0b3959b7bba3436539dec8c580a4b4fe04759643ff5596484a82f4f4acd6b","target":"record","created_at":"2026-07-05T06:50:55Z","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":"dcb6d94bf71af040866c693e77eb3e027321e982dfe9574d9afef4a5e4f736f6","cross_cats_sorted":["cs.AI","cs.LG"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.comp-ph","submitted_at":"2023-05-06T10:16:04Z","title_canon_sha256":"109b765a8dbcb502f885a3e9deed65dd28e30d03b115bed670ad07590ff0acb8"},"schema_version":"1.0","source":{"id":"2306.05554","kind":"arxiv","version":3}},"canonical_sha256":"b4806f331f53e78cb7f9edb632fd7f9972794c52fe9d0cddbe51274e1b44a076","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4806f331f53e78cb7f9edb632fd7f9972794c52fe9d0cddbe51274e1b44a076","first_computed_at":"2026-07-05T06:50:55.717773Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:50:55.717773Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+p0f4CyITgkFmYTdgm8Gz8DBSFUXXbty/2j/mKwwPM+ixJvWMhl0cvG5zt9VYsR9ctnzJh5EwscmGacZ35eGBA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:50:55.718248Z","signed_message":"canonical_sha256_bytes"},"source_id":"2306.05554","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e4c0b3959b7bba3436539dec8c580a4b4fe04759643ff5596484a82f4f4acd6b","sha256:7e4d208f169343781785f40f82cf62a6e7f09714ecd693c31d77379681535965"],"state_sha256":"69fce26a4f7eb430adc9d6002d91ce4388adffa4c5ebe19279a6413bcd14744a"}