{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:ZUDUB5PDJ2MU5LJUQW27RHRKTD","short_pith_number":"pith:ZUDUB5PD","canonical_record":{"source":{"id":"0802.1423","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-02-11T11:51:36Z","cross_cats_sorted":[],"title_canon_sha256":"98b0f0c4fb4d75c6884f78f9510d158128b54a57cd9e63ae85fe2944d52204f9","abstract_canon_sha256":"f8e8a9cd07d85fc069f09b002ecae183434a9cc4bf61e3b6dd9f97861d48180c"},"schema_version":"1.0"},"canonical_sha256":"cd0740f5e34e994ead3485b5f89e2a98f39c74f3e8bb69128be18672efe92926","source":{"kind":"arxiv","id":"0802.1423","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.1423","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"arxiv_version","alias_value":"0802.1423v2","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.1423","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_12","alias_value":"ZUDUB5PDJ2MU","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_16","alias_value":"ZUDUB5PDJ2MU5LJU","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_8","alias_value":"ZUDUB5PD","created_at":"2026-07-04T15:11:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:ZUDUB5PDJ2MU5LJUQW27RHRKTD","target":"record","payload":{"canonical_record":{"source":{"id":"0802.1423","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-02-11T11:51:36Z","cross_cats_sorted":[],"title_canon_sha256":"98b0f0c4fb4d75c6884f78f9510d158128b54a57cd9e63ae85fe2944d52204f9","abstract_canon_sha256":"f8e8a9cd07d85fc069f09b002ecae183434a9cc4bf61e3b6dd9f97861d48180c"},"schema_version":"1.0"},"canonical_sha256":"cd0740f5e34e994ead3485b5f89e2a98f39c74f3e8bb69128be18672efe92926","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:11:13.543959Z","signature_b64":"uUp/cLtGOWOCE7U2aeQIaN+Gqhs9jFx2RCoGrywvD90cBmzhg93AdmCyt5/D3BiW7PDX3bTy+PgguLOkmThfAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cd0740f5e34e994ead3485b5f89e2a98f39c74f3e8bb69128be18672efe92926","last_reissued_at":"2026-07-04T15:11:13.543537Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:11:13.543537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0802.1423","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T15:11:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zzXnUekqHJgILshNcosWkeYq7DGsqsmqfEg+6FRwEmdOnDx284X+9NRn0SKQNIoxA9iYWzeR6u4PAKAfPd7AAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T09:21:06.498241Z"},"content_sha256":"086de0d336d961788b4689354597a38f9f10572c6547b8514d9b0af1f99702ed","schema_version":"1.0","event_id":"sha256:086de0d336d961788b4689354597a38f9f10572c6547b8514d9b0af1f99702ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:ZUDUB5PDJ2MU5LJUQW27RHRKTD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Synthesis and structural characterization of uranium-doped Ca2CuO3, a 1D quantum antiferromagnet","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chau Nguyen, Dang Chinh Huynh, Duc The Ngo, Duc Tho Nguyen, Michael Finnie, Nam Nhat Hoang, Thuy Trang Nguyen","submitted_at":"2008-02-11T11:51:36Z","abstract_excerpt":"The technological settings of a modified sol-gel method for preparation of highly fine homogeneous powder Ca2CuO3 doped with uranium 238 (x=0-0.05) is presented. The analysis of structure, purity of phases and the justification for the role of uranium in the given compounds are provided together with almost complete classification of observed optical phonons by means of the Raman, IR measurements and ab initio calculation. The significant reduction in particle size was achieved by doping and the strong correlation between resistivity and doping concentration was observed and explained using th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.1423","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0802.1423/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T15:11:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zPWaxXsLsr+p4pDKX7oOSdmR6j7xiRT1ET6zM2fVPYbcq6jeGnDeKUVAQTMwi1iTJc4iOLn3aheyh54/1LIxDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T09:21:06.498627Z"},"content_sha256":"1d3dc47e73ad8562bb864f70ceb4ae95f55ce988c981d73f50e5fb055ccf5b94","schema_version":"1.0","event_id":"sha256:1d3dc47e73ad8562bb864f70ceb4ae95f55ce988c981d73f50e5fb055ccf5b94"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/bundle.json","state_url":"https://pith.science/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/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":"2026-07-07T09:21:06Z","links":{"resolver":"https://pith.science/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD","bundle":"https://pith.science/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/bundle.json","state":"https://pith.science/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZUDUB5PDJ2MU5LJUQW27RHRKTD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:ZUDUB5PDJ2MU5LJUQW27RHRKTD","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":"f8e8a9cd07d85fc069f09b002ecae183434a9cc4bf61e3b6dd9f97861d48180c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-02-11T11:51:36Z","title_canon_sha256":"98b0f0c4fb4d75c6884f78f9510d158128b54a57cd9e63ae85fe2944d52204f9"},"schema_version":"1.0","source":{"id":"0802.1423","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.1423","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"arxiv_version","alias_value":"0802.1423v2","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.1423","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_12","alias_value":"ZUDUB5PDJ2MU","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_16","alias_value":"ZUDUB5PDJ2MU5LJU","created_at":"2026-07-04T15:11:13Z"},{"alias_kind":"pith_short_8","alias_value":"ZUDUB5PD","created_at":"2026-07-04T15:11:13Z"}],"graph_snapshots":[{"event_id":"sha256:1d3dc47e73ad8562bb864f70ceb4ae95f55ce988c981d73f50e5fb055ccf5b94","target":"graph","created_at":"2026-07-04T15:11:13Z","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/0802.1423/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The technological settings of a modified sol-gel method for preparation of highly fine homogeneous powder Ca2CuO3 doped with uranium 238 (x=0-0.05) is presented. The analysis of structure, purity of phases and the justification for the role of uranium in the given compounds are provided together with almost complete classification of observed optical phonons by means of the Raman, IR measurements and ab initio calculation. The significant reduction in particle size was achieved by doping and the strong correlation between resistivity and doping concentration was observed and explained using th","authors_text":"Chau Nguyen, Dang Chinh Huynh, Duc The Ngo, Duc Tho Nguyen, Michael Finnie, Nam Nhat Hoang, Thuy Trang Nguyen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-02-11T11:51:36Z","title":"Synthesis and structural characterization of uranium-doped Ca2CuO3, a 1D quantum antiferromagnet"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.1423","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":"sha256:086de0d336d961788b4689354597a38f9f10572c6547b8514d9b0af1f99702ed","target":"record","created_at":"2026-07-04T15:11:13Z","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":"f8e8a9cd07d85fc069f09b002ecae183434a9cc4bf61e3b6dd9f97861d48180c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-02-11T11:51:36Z","title_canon_sha256":"98b0f0c4fb4d75c6884f78f9510d158128b54a57cd9e63ae85fe2944d52204f9"},"schema_version":"1.0","source":{"id":"0802.1423","kind":"arxiv","version":2}},"canonical_sha256":"cd0740f5e34e994ead3485b5f89e2a98f39c74f3e8bb69128be18672efe92926","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd0740f5e34e994ead3485b5f89e2a98f39c74f3e8bb69128be18672efe92926","first_computed_at":"2026-07-04T15:11:13.543537Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:11:13.543537Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uUp/cLtGOWOCE7U2aeQIaN+Gqhs9jFx2RCoGrywvD90cBmzhg93AdmCyt5/D3BiW7PDX3bTy+PgguLOkmThfAw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:11:13.543959Z","signed_message":"canonical_sha256_bytes"},"source_id":"0802.1423","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:086de0d336d961788b4689354597a38f9f10572c6547b8514d9b0af1f99702ed","sha256:1d3dc47e73ad8562bb864f70ceb4ae95f55ce988c981d73f50e5fb055ccf5b94"],"state_sha256":"e0357db99655dec5f45e57a641fa1ca4ac2b1698267771e18d0a704db74170fc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DVUuT685+1L3zl9lTX5uirUqKdqZIXvTLMdi9yDlQ9D3Ne55m4RkFbFo1VmAYv/bZMg/xUZTE70BpTxwhZIJBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T09:21:06.500546Z","bundle_sha256":"ddf42e86890a5c13cb21a2aabee6eec412992b5227e9b87b847e739969d438d8"}}