{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:T4WNQCHPGUQ2WC76Q6AT3BUAHG","short_pith_number":"pith:T4WNQCHP","canonical_record":{"source":{"id":"1810.09529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-02T00:28:33Z","cross_cats_sorted":[],"title_canon_sha256":"656eb400eaba209a7e69e1a6f7e6e091ecf3d805349a90754bb6d29580619a62","abstract_canon_sha256":"2f2ac3168ea4e07e41a0e3d6462f29e4d0c13d80dcb5a2c74a4c0c1268d210da"},"schema_version":"1.0"},"canonical_sha256":"9f2cd808ef3521ab0bfe87813d86803988dcbe7d46a88a0c84dbf16539ddfd03","source":{"kind":"arxiv","id":"1810.09529","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.09529","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"arxiv_version","alias_value":"1810.09529v1","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.09529","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"pith_short_12","alias_value":"T4WNQCHPGUQ2","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"T4WNQCHPGUQ2WC76","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"T4WNQCHP","created_at":"2026-05-18T12:32:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:T4WNQCHPGUQ2WC76Q6AT3BUAHG","target":"record","payload":{"canonical_record":{"source":{"id":"1810.09529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-02T00:28:33Z","cross_cats_sorted":[],"title_canon_sha256":"656eb400eaba209a7e69e1a6f7e6e091ecf3d805349a90754bb6d29580619a62","abstract_canon_sha256":"2f2ac3168ea4e07e41a0e3d6462f29e4d0c13d80dcb5a2c74a4c0c1268d210da"},"schema_version":"1.0"},"canonical_sha256":"9f2cd808ef3521ab0bfe87813d86803988dcbe7d46a88a0c84dbf16539ddfd03","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:39.344307Z","signature_b64":"L+x6ViemowQdFvekA+UA6SgX7CUT2o8hSBCl8Gt1WtOdXKropG+OXHGgyJWFZF61h6ZwSmsw1zA1W6gmXj8BDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9f2cd808ef3521ab0bfe87813d86803988dcbe7d46a88a0c84dbf16539ddfd03","last_reissued_at":"2026-05-18T00:02:39.343682Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:39.343682Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.09529","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":"2026-05-18T00:02:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DfDdJYVoJe+TSucRBEZCPyBAfTNSBn3hjTjTvolFKTS9f/w/A2g3KWw2JRjItVLY5Ehkg4BZbnTtFhpFGWqGAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T00:34:08.002528Z"},"content_sha256":"553d258b463899758cec605534edf7e31f84d0630188bcd53d2288bcbf2d183c","schema_version":"1.0","event_id":"sha256:553d258b463899758cec605534edf7e31f84d0630188bcd53d2288bcbf2d183c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:T4WNQCHPGUQ2WC76Q6AT3BUAHG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Lightweight Carbon Fiber Mirrors for Solar Concentrator Applications","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.app-ph","authors_text":"Ali Naqavi, Christophe Leclerc, Emily C. Warmann, Harry A. Atwater, Jing-Shun Huang, Michael D. Kelzenberg, Nina Vaidya, Pilar Espinet-Gonz\\'alez, Sergio Pellegrino, Tatiana G. Vinogradova","submitted_at":"2018-10-02T00:28:33Z","abstract_excerpt":"Lightweight parabolic mirrors for solar concentrators have been fabricated using carbon fiber reinforced polymer (CFRP) and a nanometer scale optical surface smoothing technique. The smoothing technique improved the surface roughness of the CFRP surface from ~3 {\\mu}m root mean square (RMS) for as-cast to ~5 nm RMS after smoothing. The surfaces were then coated with metal, which retained the sub-wavelength surface roughness, to produce a high-quality specular reflector. The mirrors were tested in an 11x geometrical concentrator configuration and achieved an optical efficiency of 78% under an A"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.09529","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":"2026-05-18T00:02:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WuLsbr6ksqzLEe+Kjqa0UUfVb4ka0IXnK/MiGmrhm2FoW9OgMJdQifdsBWdNp/YL47au8gdWUDPV99QuPDJ1Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T00:34:08.003146Z"},"content_sha256":"1ca9a516b1c66e9f47e6efd2baa1a81ac59badd5cbee5ffd610b9cd4d5a7edf5","schema_version":"1.0","event_id":"sha256:1ca9a516b1c66e9f47e6efd2baa1a81ac59badd5cbee5ffd610b9cd4d5a7edf5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/bundle.json","state_url":"https://pith.science/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/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":"2026-05-24T00:34:08Z","links":{"resolver":"https://pith.science/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG","bundle":"https://pith.science/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/bundle.json","state":"https://pith.science/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T4WNQCHPGUQ2WC76Q6AT3BUAHG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:T4WNQCHPGUQ2WC76Q6AT3BUAHG","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":"2f2ac3168ea4e07e41a0e3d6462f29e4d0c13d80dcb5a2c74a4c0c1268d210da","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-02T00:28:33Z","title_canon_sha256":"656eb400eaba209a7e69e1a6f7e6e091ecf3d805349a90754bb6d29580619a62"},"schema_version":"1.0","source":{"id":"1810.09529","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.09529","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"arxiv_version","alias_value":"1810.09529v1","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.09529","created_at":"2026-05-18T00:02:39Z"},{"alias_kind":"pith_short_12","alias_value":"T4WNQCHPGUQ2","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"T4WNQCHPGUQ2WC76","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"T4WNQCHP","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:1ca9a516b1c66e9f47e6efd2baa1a81ac59badd5cbee5ffd610b9cd4d5a7edf5","target":"graph","created_at":"2026-05-18T00:02:39Z","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":"Lightweight parabolic mirrors for solar concentrators have been fabricated using carbon fiber reinforced polymer (CFRP) and a nanometer scale optical surface smoothing technique. The smoothing technique improved the surface roughness of the CFRP surface from ~3 {\\mu}m root mean square (RMS) for as-cast to ~5 nm RMS after smoothing. The surfaces were then coated with metal, which retained the sub-wavelength surface roughness, to produce a high-quality specular reflector. The mirrors were tested in an 11x geometrical concentrator configuration and achieved an optical efficiency of 78% under an A","authors_text":"Ali Naqavi, Christophe Leclerc, Emily C. Warmann, Harry A. Atwater, Jing-Shun Huang, Michael D. Kelzenberg, Nina Vaidya, Pilar Espinet-Gonz\\'alez, Sergio Pellegrino, Tatiana G. Vinogradova","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-02T00:28:33Z","title":"Lightweight Carbon Fiber Mirrors for Solar Concentrator Applications"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.09529","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":"sha256:553d258b463899758cec605534edf7e31f84d0630188bcd53d2288bcbf2d183c","target":"record","created_at":"2026-05-18T00:02:39Z","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":"2f2ac3168ea4e07e41a0e3d6462f29e4d0c13d80dcb5a2c74a4c0c1268d210da","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-02T00:28:33Z","title_canon_sha256":"656eb400eaba209a7e69e1a6f7e6e091ecf3d805349a90754bb6d29580619a62"},"schema_version":"1.0","source":{"id":"1810.09529","kind":"arxiv","version":1}},"canonical_sha256":"9f2cd808ef3521ab0bfe87813d86803988dcbe7d46a88a0c84dbf16539ddfd03","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9f2cd808ef3521ab0bfe87813d86803988dcbe7d46a88a0c84dbf16539ddfd03","first_computed_at":"2026-05-18T00:02:39.343682Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:39.343682Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"L+x6ViemowQdFvekA+UA6SgX7CUT2o8hSBCl8Gt1WtOdXKropG+OXHGgyJWFZF61h6ZwSmsw1zA1W6gmXj8BDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:39.344307Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.09529","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:553d258b463899758cec605534edf7e31f84d0630188bcd53d2288bcbf2d183c","sha256:1ca9a516b1c66e9f47e6efd2baa1a81ac59badd5cbee5ffd610b9cd4d5a7edf5"],"state_sha256":"ca590f97e58b99b8a145134d21e386e57e8e5d3e37f6d22b0d7dae2f77a3bbf1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KN6t18YHnRuPlP3Gcvp1psAsL2FNTCQyptVHvTMk23OHdVMGY39GNgSVLCLGhyo70EZOE8IMqtobPMki1Lq4Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T00:34:08.007286Z","bundle_sha256":"0166d679789dfb54ca8cc7b2d67461e96121c53f1fdb4b36dd6ec2f538bbc6a3"}}