{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:RDILKTDCIEDUJQMK2UUZR4OMVI","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":"c5820d89f4f9a83b4fd69eb5e1b1e75b49f32c3de733a29c9e33b1236b73db1f","cross_cats_sorted":["astro-ph.CO","physics.ins-det"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-16T01:00:01Z","title_canon_sha256":"423771aea81eb6f65534b3b76b1c94ffd42ffaebab0ce90ac6d80c1099292c08"},"schema_version":"1.0","source":{"id":"2101.06337","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.06337","created_at":"2026-07-05T03:28:12Z"},{"alias_kind":"arxiv_version","alias_value":"2101.06337v1","created_at":"2026-07-05T03:28:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.06337","created_at":"2026-07-05T03:28:12Z"},{"alias_kind":"pith_short_12","alias_value":"RDILKTDCIEDU","created_at":"2026-07-05T03:28:12Z"},{"alias_kind":"pith_short_16","alias_value":"RDILKTDCIEDUJQMK","created_at":"2026-07-05T03:28:12Z"},{"alias_kind":"pith_short_8","alias_value":"RDILKTDC","created_at":"2026-07-05T03:28:12Z"}],"graph_snapshots":[{"event_id":"sha256:1041167c46149d238fb3a58ac5daa6fd895c0cc8674c260123296fa9dc510d8b","target":"graph","created_at":"2026-07-05T03:28:12Z","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/2101.06337/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This paper describes the design, implementation, and verification of a test-bed for determining the noise temperature of radio antennas operating between 400-800MHz. The requirements for this test-bed were driven by the HIRAX experiment, which uses antennas with embedded amplification, making system noise characterization difficult in the laboratory. The test-bed consists of two large cylindrical cavities, each containing radio-frequency (RF) absorber held at different temperatures (300K and 77K), allowing a measurement of system noise temperature through the well-known 'Y-factor' method. The ","authors_text":"Aaron Ewall-Wice, Alexandre Refregier, Alireza Vafaei Sadr, Amanda Weltman, Austin A. Gumba, Benjamin R. B. Saliwanchik, Corrie Ungerer, Dallas Wulf, Deniz \\\"Ol\\c{c}ek, Devin Crichton, Emily R. Kuhn, H. Cynthia Chiang, Jacques van Dyk, Jean-Paul Kneib, Jeffrey B. Peterson, Jonathan L. Sievers, Kabelo Calvin Kesebonye, Kavilan Moodley, Kevin Bandura, Laura B. Newburgh, Maile Harris, Martin Kunz, Moumita Aich, N. Gupta, Tzu-Ching Chang, Viraj Nistane, Warren Naidoo","cross_cats":["astro-ph.CO","physics.ins-det"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-16T01:00:01Z","title":"Design and implementation of a noise temperature measurement system for the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.06337","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":"sha256:49e98a1af122279028c907bd5424581ea80f74416dd306c812a9ee921d60e2fb","target":"record","created_at":"2026-07-05T03:28:12Z","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":"c5820d89f4f9a83b4fd69eb5e1b1e75b49f32c3de733a29c9e33b1236b73db1f","cross_cats_sorted":["astro-ph.CO","physics.ins-det"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-16T01:00:01Z","title_canon_sha256":"423771aea81eb6f65534b3b76b1c94ffd42ffaebab0ce90ac6d80c1099292c08"},"schema_version":"1.0","source":{"id":"2101.06337","kind":"arxiv","version":1}},"canonical_sha256":"88d0b54c62410744c18ad52998f1ccaa3dd42248a6ae5b8761b180019080064c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"88d0b54c62410744c18ad52998f1ccaa3dd42248a6ae5b8761b180019080064c","first_computed_at":"2026-07-05T03:28:12.405991Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:28:12.405991Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Du7EHmHFGcNY1FHfXnzHE/WoZPWI3CMLw/oocyfvYgqkmAAHr5w4Oo2qqPTit3JTDLJmJUcxl48saXP7F0GlBA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:28:12.406469Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.06337","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:49e98a1af122279028c907bd5424581ea80f74416dd306c812a9ee921d60e2fb","sha256:1041167c46149d238fb3a58ac5daa6fd895c0cc8674c260123296fa9dc510d8b"],"state_sha256":"5660ae48882b446f365e75e83a1127655e2087631c6ee78ad4a33b5cce054ebf"}