{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XAJT73GEJ62VW7SGG2NS5Z37H4","short_pith_number":"pith:XAJT73GE","canonical_record":{"source":{"id":"1906.00882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-06-03T15:40:51Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"cbee890519b19d64995a319168e5a22a169a38fc95951d8e2f909be5bfe256f9","abstract_canon_sha256":"445442dd2e0d015342f4a36fb06d3774b941cd57f99e024f10ed17f6a6879e45"},"schema_version":"1.0"},"canonical_sha256":"b8133fecc44fb55b7e46369b2ee77f3f18b43b11d85ea8197d4f74c6a3aa3a1d","source":{"kind":"arxiv","id":"1906.00882","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.00882","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"arxiv_version","alias_value":"1906.00882v1","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.00882","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"pith_short_12","alias_value":"XAJT73GEJ62V","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XAJT73GEJ62VW7SG","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XAJT73GE","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XAJT73GEJ62VW7SGG2NS5Z37H4","target":"record","payload":{"canonical_record":{"source":{"id":"1906.00882","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-06-03T15:40:51Z","cross_cats_sorted":["cs.CV"],"title_canon_sha256":"cbee890519b19d64995a319168e5a22a169a38fc95951d8e2f909be5bfe256f9","abstract_canon_sha256":"445442dd2e0d015342f4a36fb06d3774b941cd57f99e024f10ed17f6a6879e45"},"schema_version":"1.0"},"canonical_sha256":"b8133fecc44fb55b7e46369b2ee77f3f18b43b11d85ea8197d4f74c6a3aa3a1d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:44:23.599981Z","signature_b64":"5JgBvZMAkb/78gbXeo8jv1nsGovxN8ghu6pItwmoxuulWX37WI+/ebnlnlzptMTmZdpbeFrLv1Nb2vvz4YNwCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8133fecc44fb55b7e46369b2ee77f3f18b43b11d85ea8197d4f74c6a3aa3a1d","last_reissued_at":"2026-05-17T23:44:23.599460Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:44:23.599460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.00882","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:44:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qUX7hM+EDsaoFL48cmsncBPT+pY+Yj8c8Qwblb5LXG+9pV7RFKvDfvdb68GRSsTJ/T+Wnxr/C9jnDg2XT1ovDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:38:11.286995Z"},"content_sha256":"c4b278072027ee6d27662b63086b8be590672fc1b27c527db4664751eb77b2f4","schema_version":"1.0","event_id":"sha256:c4b278072027ee6d27662b63086b8be590672fc1b27c527db4664751eb77b2f4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XAJT73GEJ62VW7SGG2NS5Z37H4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new nonlocal forward model for diffuse optical tomography","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CV"],"primary_cat":"physics.comp-ph","authors_text":"Iain B. Styles, Jinming Duan, Joshua Deepak Veesa, Wenqi Lu","submitted_at":"2019-06-03T15:40:51Z","abstract_excerpt":"The forward model in diffuse optical tomography (DOT) describes how light propagates through a turbid medium. It is often approximated by a diffusion equation (DE) that is numerically discretized by the classical finite element method (FEM). We propose a nonlocal diffusion equation (NDE) as a new forward model for DOT, the discretization of which is carried out with an efficient graph-based numerical method (GNM). To quantitatively evaluate the new forward model, we first conduct experiments on a homogeneous slab, where the numerical accuracy of both NDE and DE is compared against the existing"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.00882","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:44:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C/38K7dSNt6t+tOlO9yPoim8h/AlzNtXzcKF8/D3B/kp/GVr/gBNEM+zP9dbxjN+vDXN1YPcO6FKVMUKVGbKBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T11:38:11.287357Z"},"content_sha256":"c2a10cffb59fd6a2f9ddaf778063514893b81b876c275a64208c360d5565aff1","schema_version":"1.0","event_id":"sha256:c2a10cffb59fd6a2f9ddaf778063514893b81b876c275a64208c360d5565aff1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/bundle.json","state_url":"https://pith.science/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-30T11:38:11Z","links":{"resolver":"https://pith.science/pith/XAJT73GEJ62VW7SGG2NS5Z37H4","bundle":"https://pith.science/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/bundle.json","state":"https://pith.science/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XAJT73GEJ62VW7SGG2NS5Z37H4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XAJT73GEJ62VW7SGG2NS5Z37H4","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":"445442dd2e0d015342f4a36fb06d3774b941cd57f99e024f10ed17f6a6879e45","cross_cats_sorted":["cs.CV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-06-03T15:40:51Z","title_canon_sha256":"cbee890519b19d64995a319168e5a22a169a38fc95951d8e2f909be5bfe256f9"},"schema_version":"1.0","source":{"id":"1906.00882","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.00882","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"arxiv_version","alias_value":"1906.00882v1","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.00882","created_at":"2026-05-17T23:44:23Z"},{"alias_kind":"pith_short_12","alias_value":"XAJT73GEJ62V","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XAJT73GEJ62VW7SG","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XAJT73GE","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:c2a10cffb59fd6a2f9ddaf778063514893b81b876c275a64208c360d5565aff1","target":"graph","created_at":"2026-05-17T23:44:23Z","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 forward model in diffuse optical tomography (DOT) describes how light propagates through a turbid medium. It is often approximated by a diffusion equation (DE) that is numerically discretized by the classical finite element method (FEM). We propose a nonlocal diffusion equation (NDE) as a new forward model for DOT, the discretization of which is carried out with an efficient graph-based numerical method (GNM). To quantitatively evaluate the new forward model, we first conduct experiments on a homogeneous slab, where the numerical accuracy of both NDE and DE is compared against the existing","authors_text":"Iain B. Styles, Jinming Duan, Joshua Deepak Veesa, Wenqi Lu","cross_cats":["cs.CV"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-06-03T15:40:51Z","title":"A new nonlocal forward model for diffuse optical tomography"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.00882","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:c4b278072027ee6d27662b63086b8be590672fc1b27c527db4664751eb77b2f4","target":"record","created_at":"2026-05-17T23:44:23Z","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":"445442dd2e0d015342f4a36fb06d3774b941cd57f99e024f10ed17f6a6879e45","cross_cats_sorted":["cs.CV"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-06-03T15:40:51Z","title_canon_sha256":"cbee890519b19d64995a319168e5a22a169a38fc95951d8e2f909be5bfe256f9"},"schema_version":"1.0","source":{"id":"1906.00882","kind":"arxiv","version":1}},"canonical_sha256":"b8133fecc44fb55b7e46369b2ee77f3f18b43b11d85ea8197d4f74c6a3aa3a1d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8133fecc44fb55b7e46369b2ee77f3f18b43b11d85ea8197d4f74c6a3aa3a1d","first_computed_at":"2026-05-17T23:44:23.599460Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:44:23.599460Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5JgBvZMAkb/78gbXeo8jv1nsGovxN8ghu6pItwmoxuulWX37WI+/ebnlnlzptMTmZdpbeFrLv1Nb2vvz4YNwCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:44:23.599981Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.00882","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c4b278072027ee6d27662b63086b8be590672fc1b27c527db4664751eb77b2f4","sha256:c2a10cffb59fd6a2f9ddaf778063514893b81b876c275a64208c360d5565aff1"],"state_sha256":"3924b9d5733f7144e52aaa4f26e633a12d09ecb6bc775497ab49abc618e077c9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cVCPyGtCyiEqPqbK7Ednvxge77ocQhXztIgyJkP9UMHb8DM5MccXoeN06oKo2kBryei8b6YGF1nfMcpENli5Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T11:38:11.289456Z","bundle_sha256":"17b306015dc701af48e6b21313e123739ab56ae3652dd3001e678dced347c01f"}}