{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:T2IRBTIRTPEVMQ4Q2QCLKJL66B","short_pith_number":"pith:T2IRBTIR","canonical_record":{"source":{"id":"1204.3837","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-04-17T16:49:42Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"24a373b9353387d7377c9f4e136b36b5edf42c0c773800cf43acbc8594831e62","abstract_canon_sha256":"ea8051e5626953e158441b1f15943927aa761576bca9a120dfc1a726fff17950"},"schema_version":"1.0"},"canonical_sha256":"9e9110cd119bc9564390d404b5257ef051812d1e70c8981ce20a4422e51a234e","source":{"kind":"arxiv","id":"1204.3837","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3837","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3837v1","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3837","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"pith_short_12","alias_value":"T2IRBTIRTPEV","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"T2IRBTIRTPEVMQ4Q","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"T2IRBTIR","created_at":"2026-05-18T12:27:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:T2IRBTIRTPEVMQ4Q2QCLKJL66B","target":"record","payload":{"canonical_record":{"source":{"id":"1204.3837","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-04-17T16:49:42Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"24a373b9353387d7377c9f4e136b36b5edf42c0c773800cf43acbc8594831e62","abstract_canon_sha256":"ea8051e5626953e158441b1f15943927aa761576bca9a120dfc1a726fff17950"},"schema_version":"1.0"},"canonical_sha256":"9e9110cd119bc9564390d404b5257ef051812d1e70c8981ce20a4422e51a234e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:57:39.415557Z","signature_b64":"GugOYU9xfJ6kGYaEAr3WvhhkLynGSs/oZIIuqqM0TKuJVPGB+3qRftWDclfChB3CRJ2UZ9PKPbGGrchwJ35tBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9e9110cd119bc9564390d404b5257ef051812d1e70c8981ce20a4422e51a234e","last_reissued_at":"2026-05-18T03:57:39.414888Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:57:39.414888Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.3837","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":"2026-05-18T03:57:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1wIw92WDSqzRGeX5jh67eCFOK3xrigNDzXhkbQHOumlSUSTMeAxhohoiGKd8ssUzH0lvOdEXnuRsbuZY4hlcCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:02:49.127987Z"},"content_sha256":"51e3942f15b6cd59ab875889310d46e153d7ff715fb5b532a5d88d8148bc1c36","schema_version":"1.0","event_id":"sha256:51e3942f15b6cd59ab875889310d46e153d7ff715fb5b532a5d88d8148bc1c36"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:T2IRBTIRTPEVMQ4Q2QCLKJL66B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Influence by proximity effect on ultrasound attenuation in Cu-Nb composite system at low temperatures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.supr-con","authors_text":"Dimitri O. Ledenyov, Mikhail A. Tikhonovsky, Oleg P. Ledenyov, Viktor O. Ledenyov","submitted_at":"2012-04-17T16:49:42Z","abstract_excerpt":"The attenuation of longitudinal ultrasonic wave with the frequency of 30 MHz in Cu-Nb copper-niobium (40 vol%) composite system at low temperatures from 0.35 K up to 2 K is researched. It was found that the ultrasonic attenuation decreases in a Cu-Nb multi-filamentary composite sample at low temperatures in distinction to the pure Cu copper or Nb niobium homogeneous bulk samples. It is well known that the contact between the normal metal N and the superconductor S is characterized by an appearance of superconducting properties in the thin surface layer of normal metal N, because of the presenc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3837","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":"2026-05-18T03:57:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2eB2PoOXcBIJlOUGAJ5UDvDn+9h8rw+9hgbJAeUYMbSI60W8QlZBvlKyJ0yK1dYXILrzOPoSceRB7fBBH8N7AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:02:49.128345Z"},"content_sha256":"cfc3964c6b0d54fcdc2aa481df0344f95813135b4764aeb5a865220745b9b6c8","schema_version":"1.0","event_id":"sha256:cfc3964c6b0d54fcdc2aa481df0344f95813135b4764aeb5a865220745b9b6c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/bundle.json","state_url":"https://pith.science/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/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":"2026-06-02T05:02:49Z","links":{"resolver":"https://pith.science/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B","bundle":"https://pith.science/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/bundle.json","state":"https://pith.science/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T2IRBTIRTPEVMQ4Q2QCLKJL66B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:T2IRBTIRTPEVMQ4Q2QCLKJL66B","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":"ea8051e5626953e158441b1f15943927aa761576bca9a120dfc1a726fff17950","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-04-17T16:49:42Z","title_canon_sha256":"24a373b9353387d7377c9f4e136b36b5edf42c0c773800cf43acbc8594831e62"},"schema_version":"1.0","source":{"id":"1204.3837","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.3837","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"arxiv_version","alias_value":"1204.3837v1","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.3837","created_at":"2026-05-18T03:57:39Z"},{"alias_kind":"pith_short_12","alias_value":"T2IRBTIRTPEV","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"T2IRBTIRTPEVMQ4Q","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"T2IRBTIR","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:cfc3964c6b0d54fcdc2aa481df0344f95813135b4764aeb5a865220745b9b6c8","target":"graph","created_at":"2026-05-18T03:57:39Z","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 attenuation of longitudinal ultrasonic wave with the frequency of 30 MHz in Cu-Nb copper-niobium (40 vol%) composite system at low temperatures from 0.35 K up to 2 K is researched. It was found that the ultrasonic attenuation decreases in a Cu-Nb multi-filamentary composite sample at low temperatures in distinction to the pure Cu copper or Nb niobium homogeneous bulk samples. It is well known that the contact between the normal metal N and the superconductor S is characterized by an appearance of superconducting properties in the thin surface layer of normal metal N, because of the presenc","authors_text":"Dimitri O. Ledenyov, Mikhail A. Tikhonovsky, Oleg P. Ledenyov, Viktor O. Ledenyov","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-04-17T16:49:42Z","title":"Influence by proximity effect on ultrasound attenuation in Cu-Nb composite system at low temperatures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.3837","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":"sha256:51e3942f15b6cd59ab875889310d46e153d7ff715fb5b532a5d88d8148bc1c36","target":"record","created_at":"2026-05-18T03:57:39Z","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":"ea8051e5626953e158441b1f15943927aa761576bca9a120dfc1a726fff17950","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2012-04-17T16:49:42Z","title_canon_sha256":"24a373b9353387d7377c9f4e136b36b5edf42c0c773800cf43acbc8594831e62"},"schema_version":"1.0","source":{"id":"1204.3837","kind":"arxiv","version":1}},"canonical_sha256":"9e9110cd119bc9564390d404b5257ef051812d1e70c8981ce20a4422e51a234e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9e9110cd119bc9564390d404b5257ef051812d1e70c8981ce20a4422e51a234e","first_computed_at":"2026-05-18T03:57:39.414888Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:57:39.414888Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GugOYU9xfJ6kGYaEAr3WvhhkLynGSs/oZIIuqqM0TKuJVPGB+3qRftWDclfChB3CRJ2UZ9PKPbGGrchwJ35tBA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:57:39.415557Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.3837","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:51e3942f15b6cd59ab875889310d46e153d7ff715fb5b532a5d88d8148bc1c36","sha256:cfc3964c6b0d54fcdc2aa481df0344f95813135b4764aeb5a865220745b9b6c8"],"state_sha256":"3c709d36954d7c7e0b77f44d93d79dc904b77575587529cd90c7c2364f511480"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tRFlDHrJHpFRHIjXcZR89WNn9n8rM83WKTIKrq2oIip+p6IujF8MnaMQzky0+s8DvE4fDgnFug6H5cyPS0YCCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T05:02:49.130383Z","bundle_sha256":"2d4e762bc2587e4b5ec4da244b065817567107a2ea5226663e6172cd722cf27a"}}