{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:37ZAHOBNUDE6ATQGAHN2G6WMBO","short_pith_number":"pith:37ZAHOBN","canonical_record":{"source":{"id":"1107.1774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-09T11:45:17Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"e811d9320c76c695d20a43eb66fe50fa10348b37452024c37103a5dbc46c16b7","abstract_canon_sha256":"e6aee6f7cc09766c9a05ab7e488cdf597ae1ea25caac69152a7869fe6eed89ed"},"schema_version":"1.0"},"canonical_sha256":"dff203b82da0c9e04e0601dba37acc0b85f984d427fa9c16ee76f9a1ec984b07","source":{"kind":"arxiv","id":"1107.1774","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.1774","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"arxiv_version","alias_value":"1107.1774v1","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.1774","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"pith_short_12","alias_value":"37ZAHOBNUDE6","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"37ZAHOBNUDE6ATQG","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"37ZAHOBN","created_at":"2026-05-18T12:26:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:37ZAHOBNUDE6ATQGAHN2G6WMBO","target":"record","payload":{"canonical_record":{"source":{"id":"1107.1774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-09T11:45:17Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"e811d9320c76c695d20a43eb66fe50fa10348b37452024c37103a5dbc46c16b7","abstract_canon_sha256":"e6aee6f7cc09766c9a05ab7e488cdf597ae1ea25caac69152a7869fe6eed89ed"},"schema_version":"1.0"},"canonical_sha256":"dff203b82da0c9e04e0601dba37acc0b85f984d427fa9c16ee76f9a1ec984b07","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:09:27.006223Z","signature_b64":"Vc2S1s01wNfIwAiMytqYf4g6d6OZjzX2hDOh84fuLuHKPWiuxjxM8WMCc0ThF3kazkJNDoNERV95RIGbUFTjBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dff203b82da0c9e04e0601dba37acc0b85f984d427fa9c16ee76f9a1ec984b07","last_reissued_at":"2026-05-18T04:09:27.005429Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:09:27.005429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.1774","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":"2026-05-18T04:09:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ElSgt7NT76EmQSc4Q06scRC6jfOL1alklLbaqJE6U4r62BwDBMkhGYwLkNU0JLoryDiXtHeALKLo/bVz/2HDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:27:26.562212Z"},"content_sha256":"1c41033c7d255b5dbc6a2498833d975fbe91e5488f9e47e582de5d763054000f","schema_version":"1.0","event_id":"sha256:1c41033c7d255b5dbc6a2498833d975fbe91e5488f9e47e582de5d763054000f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:37ZAHOBNUDE6ATQGAHN2G6WMBO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First-principles modeling of the polycyclic aromatic hydrocarbons reduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"D. W. Boukhvalov, K. M\\\"ullen, X. Feng","submitted_at":"2011-07-09T11:45:17Z","abstract_excerpt":"Density functional theory modelling of the reduction of realistic nanographene molecules (C42H18, C48H18 and C60H24) by molecular hydrogen evidences for the presence of limits in the hydrogenation process. These limits caused the contentions between three-fold symmetry of polycyclic aromatic hydrocarbon molecules and two-fold symmetry of adsorbed hydrogen pairs. Increase of the binding energy between nanographenes during reduction is also discussed as possible cause of the experimentally observed limited hydrogenation of studied nanographenes."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.1774","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":"2026-05-18T04:09:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W15ug2FNzUBjmwFexpnKfU6Wvz7+F2Kt6eij7qciyo0i6lEi7q0JZutzlTdBeWIMdvbNWmCdMa2pGME2LdSuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T07:27:26.562976Z"},"content_sha256":"2751513b79202941af1bfc05d7e6755f3b6043cbd4a8812411b82168cdf686e9","schema_version":"1.0","event_id":"sha256:2751513b79202941af1bfc05d7e6755f3b6043cbd4a8812411b82168cdf686e9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/bundle.json","state_url":"https://pith.science/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/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":"2026-05-26T07:27:26Z","links":{"resolver":"https://pith.science/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO","bundle":"https://pith.science/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/bundle.json","state":"https://pith.science/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/37ZAHOBNUDE6ATQGAHN2G6WMBO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:37ZAHOBNUDE6ATQGAHN2G6WMBO","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":"e6aee6f7cc09766c9a05ab7e488cdf597ae1ea25caac69152a7869fe6eed89ed","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-09T11:45:17Z","title_canon_sha256":"e811d9320c76c695d20a43eb66fe50fa10348b37452024c37103a5dbc46c16b7"},"schema_version":"1.0","source":{"id":"1107.1774","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.1774","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"arxiv_version","alias_value":"1107.1774v1","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.1774","created_at":"2026-05-18T04:09:27Z"},{"alias_kind":"pith_short_12","alias_value":"37ZAHOBNUDE6","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"37ZAHOBNUDE6ATQG","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"37ZAHOBN","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:2751513b79202941af1bfc05d7e6755f3b6043cbd4a8812411b82168cdf686e9","target":"graph","created_at":"2026-05-18T04:09:27Z","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":"Density functional theory modelling of the reduction of realistic nanographene molecules (C42H18, C48H18 and C60H24) by molecular hydrogen evidences for the presence of limits in the hydrogenation process. These limits caused the contentions between three-fold symmetry of polycyclic aromatic hydrocarbon molecules and two-fold symmetry of adsorbed hydrogen pairs. Increase of the binding energy between nanographenes during reduction is also discussed as possible cause of the experimentally observed limited hydrogenation of studied nanographenes.","authors_text":"D. W. Boukhvalov, K. M\\\"ullen, X. Feng","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-09T11:45:17Z","title":"First-principles modeling of the polycyclic aromatic hydrocarbons reduction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.1774","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":"sha256:1c41033c7d255b5dbc6a2498833d975fbe91e5488f9e47e582de5d763054000f","target":"record","created_at":"2026-05-18T04:09:27Z","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":"e6aee6f7cc09766c9a05ab7e488cdf597ae1ea25caac69152a7869fe6eed89ed","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-07-09T11:45:17Z","title_canon_sha256":"e811d9320c76c695d20a43eb66fe50fa10348b37452024c37103a5dbc46c16b7"},"schema_version":"1.0","source":{"id":"1107.1774","kind":"arxiv","version":1}},"canonical_sha256":"dff203b82da0c9e04e0601dba37acc0b85f984d427fa9c16ee76f9a1ec984b07","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dff203b82da0c9e04e0601dba37acc0b85f984d427fa9c16ee76f9a1ec984b07","first_computed_at":"2026-05-18T04:09:27.005429Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:09:27.005429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Vc2S1s01wNfIwAiMytqYf4g6d6OZjzX2hDOh84fuLuHKPWiuxjxM8WMCc0ThF3kazkJNDoNERV95RIGbUFTjBw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:09:27.006223Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.1774","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1c41033c7d255b5dbc6a2498833d975fbe91e5488f9e47e582de5d763054000f","sha256:2751513b79202941af1bfc05d7e6755f3b6043cbd4a8812411b82168cdf686e9"],"state_sha256":"fbf9756171c1b7c0744c2dc7b696321a3859e0410235cab494444d1741159e7e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"talZCe7oBheDHoRzNa8PtvAQgZmziIOFyF9g+0HCteE1O0kXDBk3qkA5cGqIv5HWqojasDBaryMIVEtlYZbwAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T07:27:26.566220Z","bundle_sha256":"16fb22656cf80a84b53780211fb745ee7dd9dec0e6bea1d2d8328278579a08c8"}}