{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:KHIUXS33AK575TPB53ZV7U22CW","short_pith_number":"pith:KHIUXS33","schema_version":"1.0","canonical_sha256":"51d14bcb7b02bbfecde1eef35fd35a15be7774e17b9b7d9a92c6b8ae4b2590a3","source":{"kind":"arxiv","id":"1311.1933","version":1},"attestation_state":"computed","paper":{"title":"Extraordinary absorption of sound in porous lamella-crystals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. Cebrecos, F.J. Garc\\'ia de Abajo, J. Christensen, M. Willatzen, N. A. Mortensen, R. Pic\\'o, V. J. S\\'anchez-Morcillo, V. Romero-Garc\\'ia","submitted_at":"2013-11-08T11:09:42Z","abstract_excerpt":"We present the design of a structured material supporting complete absorption of sound with a broadband response and functional for any direction of incident radiation. The structure which is fabricated out of porous lamellas is arranged into a low-density crystal and backed by a reflecting support. Experimental measurements show that strong all-angle sound absorption with almost zero reflectance takes place for a frequency range exceeding two octaves. We demonstrate that lowering the crystal filling fraction increases the wave interaction time and is responsible for the enhancement of intrins"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1311.1933","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-11-08T11:09:42Z","cross_cats_sorted":[],"title_canon_sha256":"4cbda5ab5353971f06000a832c2d4bb3e9b1b9d8bc808829121df7a1e61b17a3","abstract_canon_sha256":"4a0aff0c06e6b9b8e779d36693d677d414637d89673edd626d0a6b1b79e156a0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:54:05.026417Z","signature_b64":"f8BAKsXUFQk8ClqIDHghLUH7vmuIeU8fw0LbTZqjxOBsiSjFtfWNVb3FsHK9OKBR2KK3YM1kz4dRKoR6pQTADw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"51d14bcb7b02bbfecde1eef35fd35a15be7774e17b9b7d9a92c6b8ae4b2590a3","last_reissued_at":"2026-05-18T02:54:05.025738Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:54:05.025738Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Extraordinary absorption of sound in porous lamella-crystals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. Cebrecos, F.J. Garc\\'ia de Abajo, J. Christensen, M. Willatzen, N. A. Mortensen, R. Pic\\'o, V. J. S\\'anchez-Morcillo, V. Romero-Garc\\'ia","submitted_at":"2013-11-08T11:09:42Z","abstract_excerpt":"We present the design of a structured material supporting complete absorption of sound with a broadband response and functional for any direction of incident radiation. The structure which is fabricated out of porous lamellas is arranged into a low-density crystal and backed by a reflecting support. Experimental measurements show that strong all-angle sound absorption with almost zero reflectance takes place for a frequency range exceeding two octaves. We demonstrate that lowering the crystal filling fraction increases the wave interaction time and is responsible for the enhancement of intrins"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1933","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1311.1933","created_at":"2026-05-18T02:54:05.025857+00:00"},{"alias_kind":"arxiv_version","alias_value":"1311.1933v1","created_at":"2026-05-18T02:54:05.025857+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1933","created_at":"2026-05-18T02:54:05.025857+00:00"},{"alias_kind":"pith_short_12","alias_value":"KHIUXS33AK57","created_at":"2026-05-18T12:27:49.015174+00:00"},{"alias_kind":"pith_short_16","alias_value":"KHIUXS33AK575TPB","created_at":"2026-05-18T12:27:49.015174+00:00"},{"alias_kind":"pith_short_8","alias_value":"KHIUXS33","created_at":"2026-05-18T12:27:49.015174+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW","json":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW.json","graph_json":"https://pith.science/api/pith-number/KHIUXS33AK575TPB53ZV7U22CW/graph.json","events_json":"https://pith.science/api/pith-number/KHIUXS33AK575TPB53ZV7U22CW/events.json","paper":"https://pith.science/paper/KHIUXS33"},"agent_actions":{"view_html":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW","download_json":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW.json","view_paper":"https://pith.science/paper/KHIUXS33","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1311.1933&json=true","fetch_graph":"https://pith.science/api/pith-number/KHIUXS33AK575TPB53ZV7U22CW/graph.json","fetch_events":"https://pith.science/api/pith-number/KHIUXS33AK575TPB53ZV7U22CW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW/action/storage_attestation","attest_author":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW/action/author_attestation","sign_citation":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW/action/citation_signature","submit_replication":"https://pith.science/pith/KHIUXS33AK575TPB53ZV7U22CW/action/replication_record"}},"created_at":"2026-05-18T02:54:05.025857+00:00","updated_at":"2026-05-18T02:54:05.025857+00:00"}