{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:I2EJTZDXDVHDTCSKEGTDUGR5AD","short_pith_number":"pith:I2EJTZDX","canonical_record":{"source":{"id":"1703.01079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-03-03T08:43:03Z","cross_cats_sorted":[],"title_canon_sha256":"fbf7d1e474b323407d197b054b5edf197d0a79b1e7bda18b3c685198e2782738","abstract_canon_sha256":"d9b87a1f3574957eef72e1607e74828b6e1214ec21b3b30d0543a977ee6f51d5"},"schema_version":"1.0"},"canonical_sha256":"468899e4771d4e398a4a21a63a1a3d00d6aab6d12373630484e4c6176e2a087c","source":{"kind":"arxiv","id":"1703.01079","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01079","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01079v1","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01079","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"pith_short_12","alias_value":"I2EJTZDXDVHD","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"I2EJTZDXDVHDTCSK","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"I2EJTZDX","created_at":"2026-05-18T12:31:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:I2EJTZDXDVHDTCSKEGTDUGR5AD","target":"record","payload":{"canonical_record":{"source":{"id":"1703.01079","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-03-03T08:43:03Z","cross_cats_sorted":[],"title_canon_sha256":"fbf7d1e474b323407d197b054b5edf197d0a79b1e7bda18b3c685198e2782738","abstract_canon_sha256":"d9b87a1f3574957eef72e1607e74828b6e1214ec21b3b30d0543a977ee6f51d5"},"schema_version":"1.0"},"canonical_sha256":"468899e4771d4e398a4a21a63a1a3d00d6aab6d12373630484e4c6176e2a087c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:36.083978Z","signature_b64":"g6WUTMMdSmzcggEkBuSn7ehaxLj5vpmrRgWUJHVlMyJL/oJmFaAi/HhDeESnOAywK616r16y5Zjq+WZ9UVJoBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"468899e4771d4e398a4a21a63a1a3d00d6aab6d12373630484e4c6176e2a087c","last_reissued_at":"2026-05-18T00:49:36.083238Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:36.083238Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1703.01079","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":"2026-05-18T00:49:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1jl4w9QQRtV/CluaS3hUyZIJ+vRKMZmZtbOdg/+54fdkpThz9Ts+Jj2J3VFvKiVbDdBmo6GODWq00FrY0TvcCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T23:04:12.939348Z"},"content_sha256":"e9bd1c4890e345d6776bee347bb1d53f664f34af58997bc8e6a8eea10c7c585d","schema_version":"1.0","event_id":"sha256:e9bd1c4890e345d6776bee347bb1d53f664f34af58997bc8e6a8eea10c7c585d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:I2EJTZDXDVHDTCSKEGTDUGR5AD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A spatially optimized wind tunnel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Nico Reinke","submitted_at":"2017-03-03T08:43:03Z","abstract_excerpt":"In this report a wind tunnel is described in term of its design, its construction as well as in its validation of flow features. This wind tunnel is characterized by a new unconventional design. The innovative design allows an unusual long flow test section (in particular important for turbulence research) relative to the total size of the wind tunnel. Thus, the new design enables a much better use of space in comparison to a wind tunnel with conventional design. The design is characterized by two strong expansions of flow, namely a wide angle diffusor and strong expanding corner. Among other "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01079","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":"2026-05-18T00:49:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OTvz+7KGpwpXQTSFgE5stfzJgI3HbZfHnXqetXsmA/qA1SwhRv6DRAhUlyfdIXvL6+a+c2GouXAlcx64OcQaBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T23:04:12.939692Z"},"content_sha256":"4788268da0e30029369435d907a27c62ee35af2c2dfe3c977f6395bb66d84d90","schema_version":"1.0","event_id":"sha256:4788268da0e30029369435d907a27c62ee35af2c2dfe3c977f6395bb66d84d90"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/bundle.json","state_url":"https://pith.science/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/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":"2026-06-25T23:04:12Z","links":{"resolver":"https://pith.science/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD","bundle":"https://pith.science/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/bundle.json","state":"https://pith.science/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I2EJTZDXDVHDTCSKEGTDUGR5AD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:I2EJTZDXDVHDTCSKEGTDUGR5AD","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":"d9b87a1f3574957eef72e1607e74828b6e1214ec21b3b30d0543a977ee6f51d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-03-03T08:43:03Z","title_canon_sha256":"fbf7d1e474b323407d197b054b5edf197d0a79b1e7bda18b3c685198e2782738"},"schema_version":"1.0","source":{"id":"1703.01079","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.01079","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"arxiv_version","alias_value":"1703.01079v1","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.01079","created_at":"2026-05-18T00:49:36Z"},{"alias_kind":"pith_short_12","alias_value":"I2EJTZDXDVHD","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_16","alias_value":"I2EJTZDXDVHDTCSK","created_at":"2026-05-18T12:31:21Z"},{"alias_kind":"pith_short_8","alias_value":"I2EJTZDX","created_at":"2026-05-18T12:31:21Z"}],"graph_snapshots":[{"event_id":"sha256:4788268da0e30029369435d907a27c62ee35af2c2dfe3c977f6395bb66d84d90","target":"graph","created_at":"2026-05-18T00:49:36Z","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":"In this report a wind tunnel is described in term of its design, its construction as well as in its validation of flow features. This wind tunnel is characterized by a new unconventional design. The innovative design allows an unusual long flow test section (in particular important for turbulence research) relative to the total size of the wind tunnel. Thus, the new design enables a much better use of space in comparison to a wind tunnel with conventional design. The design is characterized by two strong expansions of flow, namely a wide angle diffusor and strong expanding corner. Among other ","authors_text":"Nico Reinke","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-03-03T08:43:03Z","title":"A spatially optimized wind tunnel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.01079","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:e9bd1c4890e345d6776bee347bb1d53f664f34af58997bc8e6a8eea10c7c585d","target":"record","created_at":"2026-05-18T00:49:36Z","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":"d9b87a1f3574957eef72e1607e74828b6e1214ec21b3b30d0543a977ee6f51d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-03-03T08:43:03Z","title_canon_sha256":"fbf7d1e474b323407d197b054b5edf197d0a79b1e7bda18b3c685198e2782738"},"schema_version":"1.0","source":{"id":"1703.01079","kind":"arxiv","version":1}},"canonical_sha256":"468899e4771d4e398a4a21a63a1a3d00d6aab6d12373630484e4c6176e2a087c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"468899e4771d4e398a4a21a63a1a3d00d6aab6d12373630484e4c6176e2a087c","first_computed_at":"2026-05-18T00:49:36.083238Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:36.083238Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"g6WUTMMdSmzcggEkBuSn7ehaxLj5vpmrRgWUJHVlMyJL/oJmFaAi/HhDeESnOAywK616r16y5Zjq+WZ9UVJoBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:36.083978Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.01079","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e9bd1c4890e345d6776bee347bb1d53f664f34af58997bc8e6a8eea10c7c585d","sha256:4788268da0e30029369435d907a27c62ee35af2c2dfe3c977f6395bb66d84d90"],"state_sha256":"d0827afbc4e148773453da5b8ecb7bd7fd12e0b897eab7cdf79a7aa21f954eb6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xczKZjnPvpZO1J0K5LaT59QRJTvJeWzXaV/lOhGS0XKNjGckC44kOq3lGecbBHM1h6l07Z4lnfBzHYYd06S9Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T23:04:12.941517Z","bundle_sha256":"337bc9b571bafe31247fc01f6ef8820bd3bc6b8b746fb4f7f04da35110437ec6"}}