{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:SA3VKO277BKU25A7OB2LDITJFN","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":"89cb6a24ecb44295edaa01adc63eb736fefb461273a765ad20307aa406a63056","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-26T13:07:00Z","title_canon_sha256":"268dfe1e7064747aeba515efd3f47c8af26981b3e0359fca2951465e98aad69f"},"schema_version":"1.0","source":{"id":"1602.08304","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.08304","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"arxiv_version","alias_value":"1602.08304v3","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.08304","created_at":"2026-05-18T01:01:42Z"},{"alias_kind":"pith_short_12","alias_value":"SA3VKO277BKU","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SA3VKO277BKU25A7","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SA3VKO27","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:636aded305f93a1c3a703e9c5417970f3d59e904266afa8f7ec8deedf094d690","target":"graph","created_at":"2026-05-18T01:01:42Z","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":"Faults and geological barriers can drastically affect the flow patterns in porous media. Such fractures can be modeled as interfaces that interact with the surrounding matrix. We propose a new technique for the estimation of the location and hydrogeological properties of a small number of large fractures in a porous medium from given distributed pressure or flow data. At each iteration, the algorithm builds a short list of candidates by comparing fracture indicators. These indicators quantify at the first order the decrease of a data misfit function; they are cheap to compute. Then, the best c","authors_text":"Cheikh Fatma (LAMSIN, Fran\\c{c}ois Cl\\'ement (SERENA), Guy Chavent (SERENA), Hend Ben Ameur (LAMSIN), Jean E. Roberts (SERENA), SERENA), Vincent Martin (LMAC)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-26T13:07:00Z","title":"First-Order Indicators for the Estimation of Discrete Fractures in Porous Media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.08304","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:d2f73be89e9f4c765d28e642c279c896d516c63f78c851cc5a8ac36891fe86da","target":"record","created_at":"2026-05-18T01:01:42Z","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":"89cb6a24ecb44295edaa01adc63eb736fefb461273a765ad20307aa406a63056","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2016-02-26T13:07:00Z","title_canon_sha256":"268dfe1e7064747aeba515efd3f47c8af26981b3e0359fca2951465e98aad69f"},"schema_version":"1.0","source":{"id":"1602.08304","kind":"arxiv","version":3}},"canonical_sha256":"9037553b5ff8554d741f7074b1a2692b6e85a5ff6366adeaaba1798d7e1b18f6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9037553b5ff8554d741f7074b1a2692b6e85a5ff6366adeaaba1798d7e1b18f6","first_computed_at":"2026-05-18T01:01:42.081953Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:01:42.081953Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oAaTOJIm9jCIkpk5kmJFTcksf+fd7sHc1tAcRHNhPsq1Vt+SRMajL+1MzvdKEH05jm3TrS9FlHBdSmmghNQxCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:01:42.082409Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.08304","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d2f73be89e9f4c765d28e642c279c896d516c63f78c851cc5a8ac36891fe86da","sha256:636aded305f93a1c3a703e9c5417970f3d59e904266afa8f7ec8deedf094d690"],"state_sha256":"401565e7017af8981e6fa7a66107d7adde64385874a5735dd9f7212a3f1b3cba"}