{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:LLQNX5KJDLVII6BBUJPIRN2JQK","short_pith_number":"pith:LLQNX5KJ","canonical_record":{"source":{"id":"1812.10003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-12-25T01:05:40Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f62e5e9295d3320134cb25c8bd8081b51e91ec233c76983b45c2ee6511e5c953","abstract_canon_sha256":"315c13570f76a9576b6c497bb85ce1259c40134407d978f2879efa6a7b01c060"},"schema_version":"1.0"},"canonical_sha256":"5ae0dbf5491aea847821a25e88b749829a1cec81ce54f14456cdf306ba25f3c2","source":{"kind":"arxiv","id":"1812.10003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.10003","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1812.10003v1","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.10003","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"LLQNX5KJDLVI","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"LLQNX5KJDLVII6BB","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"LLQNX5KJ","created_at":"2026-05-18T12:32:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:LLQNX5KJDLVII6BBUJPIRN2JQK","target":"record","payload":{"canonical_record":{"source":{"id":"1812.10003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-12-25T01:05:40Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"f62e5e9295d3320134cb25c8bd8081b51e91ec233c76983b45c2ee6511e5c953","abstract_canon_sha256":"315c13570f76a9576b6c497bb85ce1259c40134407d978f2879efa6a7b01c060"},"schema_version":"1.0"},"canonical_sha256":"5ae0dbf5491aea847821a25e88b749829a1cec81ce54f14456cdf306ba25f3c2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:28.099220Z","signature_b64":"IuAidKhL4tIHPzIccDs8mj/35qFIKlmRTDHpuvsfaIyNx6F6CN/IBunI9YJOk7iAELMCcSPh7NVumrfy5uvwDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5ae0dbf5491aea847821a25e88b749829a1cec81ce54f14456cdf306ba25f3c2","last_reissued_at":"2026-05-17T23:54:28.098648Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:28.098648Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.10003","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":"2026-05-17T23:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QZtZpgyN2ZSC++sf4GTqHHcxqyjjLmJgTJhgv7HhOusgKRQnIt4CwVOEbseA73qetohx0KvFCBOe8FPqfJqfBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:11:45.297521Z"},"content_sha256":"885137fb91af323cc7e8f684b8061447f6ac24c3faa50b5c65fb30919d5b20dd","schema_version":"1.0","event_id":"sha256:885137fb91af323cc7e8f684b8061447f6ac24c3faa50b5c65fb30919d5b20dd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:LLQNX5KJDLVII6BBUJPIRN2JQK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Self-Noise modelling and acoustic scaling of an axial fan configured with rotating controlled diffusion blade","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"physics.flu-dyn","authors_text":"Behdad Davoudi, Scott C. Morris","submitted_at":"2018-12-25T01:05:40Z","abstract_excerpt":"A semi-empirical acoustic model for self-noise was adapted to predict the sound radiated from an axial fan featuring rotating controlled diffusion blades (RCDB). Experimental data for wake velocity, mass flow rate across the fan, and fan rotational speed were obtained. These experimental data along with typical characteristics of turbulent boundary layers were used to predict the noise of the axial fan. Hot-wire wake measurements were made in the near region downstream of the fan plane. The fan noise was measured upstream of the fan. The experimentally obtained self-noise was then compared to "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.10003","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":"2026-05-17T23:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aP3CzEyeIa6ErYY+a70lNMu6sktcTFsk1RLNR0eGQBA31w3qlpXPhDK7HyDM1ES+BiqOJuLJAK3J9W7qmzVvDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:11:45.298174Z"},"content_sha256":"35fd4878b9c5d226ee1d0ebb6353ac9509093eab97c34a63c3500fb624f66e0e","schema_version":"1.0","event_id":"sha256:35fd4878b9c5d226ee1d0ebb6353ac9509093eab97c34a63c3500fb624f66e0e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/bundle.json","state_url":"https://pith.science/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/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":"2026-05-31T19:11:45Z","links":{"resolver":"https://pith.science/pith/LLQNX5KJDLVII6BBUJPIRN2JQK","bundle":"https://pith.science/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/bundle.json","state":"https://pith.science/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LLQNX5KJDLVII6BBUJPIRN2JQK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:LLQNX5KJDLVII6BBUJPIRN2JQK","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":"315c13570f76a9576b6c497bb85ce1259c40134407d978f2879efa6a7b01c060","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-12-25T01:05:40Z","title_canon_sha256":"f62e5e9295d3320134cb25c8bd8081b51e91ec233c76983b45c2ee6511e5c953"},"schema_version":"1.0","source":{"id":"1812.10003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.10003","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1812.10003v1","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.10003","created_at":"2026-05-17T23:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"LLQNX5KJDLVI","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_16","alias_value":"LLQNX5KJDLVII6BB","created_at":"2026-05-18T12:32:37Z"},{"alias_kind":"pith_short_8","alias_value":"LLQNX5KJ","created_at":"2026-05-18T12:32:37Z"}],"graph_snapshots":[{"event_id":"sha256:35fd4878b9c5d226ee1d0ebb6353ac9509093eab97c34a63c3500fb624f66e0e","target":"graph","created_at":"2026-05-17T23:54:28Z","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":"A semi-empirical acoustic model for self-noise was adapted to predict the sound radiated from an axial fan featuring rotating controlled diffusion blades (RCDB). Experimental data for wake velocity, mass flow rate across the fan, and fan rotational speed were obtained. These experimental data along with typical characteristics of turbulent boundary layers were used to predict the noise of the axial fan. Hot-wire wake measurements were made in the near region downstream of the fan plane. The fan noise was measured upstream of the fan. The experimentally obtained self-noise was then compared to ","authors_text":"Behdad Davoudi, Scott C. Morris","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-12-25T01:05:40Z","title":"Self-Noise modelling and acoustic scaling of an axial fan configured with rotating controlled diffusion blade"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.10003","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":"sha256:885137fb91af323cc7e8f684b8061447f6ac24c3faa50b5c65fb30919d5b20dd","target":"record","created_at":"2026-05-17T23:54:28Z","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":"315c13570f76a9576b6c497bb85ce1259c40134407d978f2879efa6a7b01c060","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-12-25T01:05:40Z","title_canon_sha256":"f62e5e9295d3320134cb25c8bd8081b51e91ec233c76983b45c2ee6511e5c953"},"schema_version":"1.0","source":{"id":"1812.10003","kind":"arxiv","version":1}},"canonical_sha256":"5ae0dbf5491aea847821a25e88b749829a1cec81ce54f14456cdf306ba25f3c2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5ae0dbf5491aea847821a25e88b749829a1cec81ce54f14456cdf306ba25f3c2","first_computed_at":"2026-05-17T23:54:28.098648Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:28.098648Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IuAidKhL4tIHPzIccDs8mj/35qFIKlmRTDHpuvsfaIyNx6F6CN/IBunI9YJOk7iAELMCcSPh7NVumrfy5uvwDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:28.099220Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.10003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:885137fb91af323cc7e8f684b8061447f6ac24c3faa50b5c65fb30919d5b20dd","sha256:35fd4878b9c5d226ee1d0ebb6353ac9509093eab97c34a63c3500fb624f66e0e"],"state_sha256":"be2a2be7c387a9df0be3d2f9b5ee9f0365f200861cb83b080e39c3ce5e62c694"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CMc4tdy/oLbeOlQanXXXTw3AtXx//mrHy6QBarDELheQmqoulRgZNMLLN5+7oAGepx3b3YGO1II+NaWwW0b7CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T19:11:45.301894Z","bundle_sha256":"6d815f084a42c53d8f607eb0fe07c330ef7ccfee1f33fb84866d07778fa125ea"}}