{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:TM634G5U6FNKQR7YT7BMA4FWBE","short_pith_number":"pith:TM634G5U","canonical_record":{"source":{"id":"2203.07036","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.app-ph","submitted_at":"2022-03-07T11:13:48Z","cross_cats_sorted":["physics.class-ph"],"title_canon_sha256":"307cc45151af3ddc71957858acbfc629ca84f6996dbbcd40afb2545680728704","abstract_canon_sha256":"8cf376118bb25ab76602b259394fa65f0f31f47f9be66816082c8aa582e0d643"},"schema_version":"1.0"},"canonical_sha256":"9b3dbe1bb4f15aa847f89fc2c070b6091a2f542d4a8e48102756e37a3eb4a71d","source":{"kind":"arxiv","id":"2203.07036","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2203.07036","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"arxiv_version","alias_value":"2203.07036v1","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2203.07036","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_12","alias_value":"TM634G5U6FNK","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_16","alias_value":"TM634G5U6FNKQR7Y","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_8","alias_value":"TM634G5U","created_at":"2026-07-05T04:25:16Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:TM634G5U6FNKQR7YT7BMA4FWBE","target":"record","payload":{"canonical_record":{"source":{"id":"2203.07036","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.app-ph","submitted_at":"2022-03-07T11:13:48Z","cross_cats_sorted":["physics.class-ph"],"title_canon_sha256":"307cc45151af3ddc71957858acbfc629ca84f6996dbbcd40afb2545680728704","abstract_canon_sha256":"8cf376118bb25ab76602b259394fa65f0f31f47f9be66816082c8aa582e0d643"},"schema_version":"1.0"},"canonical_sha256":"9b3dbe1bb4f15aa847f89fc2c070b6091a2f542d4a8e48102756e37a3eb4a71d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:25:16.377581Z","signature_b64":"8Krcycju24tfKcrhn/5pNfnGKz2wXKjM8cjIa9YXe1Enx1vPe1AFc3La9KZiLMYthujgAU7sU1Y7LMaDUZAoCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9b3dbe1bb4f15aa847f89fc2c070b6091a2f542d4a8e48102756e37a3eb4a71d","last_reissued_at":"2026-07-05T04:25:16.377151Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:25:16.377151Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2203.07036","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":"2026-07-05T04:25:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eEIasCqoxZO9PWcmLQir/UiR+XBd6m3iEuFzO0LzGTfsDMNX8YSJuvsBUy4nN62wZT/SNR+EqHEGj6xNI+qkCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T08:02:31.348293Z"},"content_sha256":"44007f73957315a3a36e4a608aae0f0b3a4e3abc8fd0534684994e6a9def4ecf","schema_version":"1.0","event_id":"sha256:44007f73957315a3a36e4a608aae0f0b3a4e3abc8fd0534684994e6a9def4ecf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:TM634G5U6FNKQR7YT7BMA4FWBE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Microwave and Acoustic Absorption Metamaterials","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["physics.class-ph"],"primary_cat":"physics.app-ph","authors_text":"Ping Sheng, Sichao Qu","submitted_at":"2022-03-07T11:13:48Z","abstract_excerpt":"Wave absorption metamaterials have been an enduring topic over the past two decades, propelled not only by novel scientific advances, but also by their extensive application potential. In this review, we aim to provide some general insights into the absorption mechanism common to both microwave and acoustic systems. By establishing a universal model for resonance-based metamaterials, we present the theoretical conditions for broadband impedance matching and introduce the fundamental causal limit as an evaluation tool for absorption performance. Under this integrated framework, we survey the re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.07036","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2203.07036/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T04:25:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QaTD30LNSu4gcHUoHUT/oEOpYo3OK4WJ3ejJnMZnojCPkEJ4O+4vsV4sDqgIwG4gbmb2MMDoyyDmXx8c87rsCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T08:02:31.348683Z"},"content_sha256":"a9bf4adf416ad58ebc23a2548ef07e819a6993d63c007265766dc2694ba2ca16","schema_version":"1.0","event_id":"sha256:a9bf4adf416ad58ebc23a2548ef07e819a6993d63c007265766dc2694ba2ca16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TM634G5U6FNKQR7YT7BMA4FWBE/bundle.json","state_url":"https://pith.science/pith/TM634G5U6FNKQR7YT7BMA4FWBE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TM634G5U6FNKQR7YT7BMA4FWBE/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":"2026-07-07T08:02:31Z","links":{"resolver":"https://pith.science/pith/TM634G5U6FNKQR7YT7BMA4FWBE","bundle":"https://pith.science/pith/TM634G5U6FNKQR7YT7BMA4FWBE/bundle.json","state":"https://pith.science/pith/TM634G5U6FNKQR7YT7BMA4FWBE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TM634G5U6FNKQR7YT7BMA4FWBE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:TM634G5U6FNKQR7YT7BMA4FWBE","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":"8cf376118bb25ab76602b259394fa65f0f31f47f9be66816082c8aa582e0d643","cross_cats_sorted":["physics.class-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.app-ph","submitted_at":"2022-03-07T11:13:48Z","title_canon_sha256":"307cc45151af3ddc71957858acbfc629ca84f6996dbbcd40afb2545680728704"},"schema_version":"1.0","source":{"id":"2203.07036","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2203.07036","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"arxiv_version","alias_value":"2203.07036v1","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2203.07036","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_12","alias_value":"TM634G5U6FNK","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_16","alias_value":"TM634G5U6FNKQR7Y","created_at":"2026-07-05T04:25:16Z"},{"alias_kind":"pith_short_8","alias_value":"TM634G5U","created_at":"2026-07-05T04:25:16Z"}],"graph_snapshots":[{"event_id":"sha256:a9bf4adf416ad58ebc23a2548ef07e819a6993d63c007265766dc2694ba2ca16","target":"graph","created_at":"2026-07-05T04:25:16Z","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/2203.07036/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Wave absorption metamaterials have been an enduring topic over the past two decades, propelled not only by novel scientific advances, but also by their extensive application potential. In this review, we aim to provide some general insights into the absorption mechanism common to both microwave and acoustic systems. By establishing a universal model for resonance-based metamaterials, we present the theoretical conditions for broadband impedance matching and introduce the fundamental causal limit as an evaluation tool for absorption performance. Under this integrated framework, we survey the re","authors_text":"Ping Sheng, Sichao Qu","cross_cats":["physics.class-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.app-ph","submitted_at":"2022-03-07T11:13:48Z","title":"Microwave and Acoustic Absorption Metamaterials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2203.07036","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":"sha256:44007f73957315a3a36e4a608aae0f0b3a4e3abc8fd0534684994e6a9def4ecf","target":"record","created_at":"2026-07-05T04:25:16Z","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":"8cf376118bb25ab76602b259394fa65f0f31f47f9be66816082c8aa582e0d643","cross_cats_sorted":["physics.class-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"physics.app-ph","submitted_at":"2022-03-07T11:13:48Z","title_canon_sha256":"307cc45151af3ddc71957858acbfc629ca84f6996dbbcd40afb2545680728704"},"schema_version":"1.0","source":{"id":"2203.07036","kind":"arxiv","version":1}},"canonical_sha256":"9b3dbe1bb4f15aa847f89fc2c070b6091a2f542d4a8e48102756e37a3eb4a71d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9b3dbe1bb4f15aa847f89fc2c070b6091a2f542d4a8e48102756e37a3eb4a71d","first_computed_at":"2026-07-05T04:25:16.377151Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:25:16.377151Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8Krcycju24tfKcrhn/5pNfnGKz2wXKjM8cjIa9YXe1Enx1vPe1AFc3La9KZiLMYthujgAU7sU1Y7LMaDUZAoCw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:25:16.377581Z","signed_message":"canonical_sha256_bytes"},"source_id":"2203.07036","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44007f73957315a3a36e4a608aae0f0b3a4e3abc8fd0534684994e6a9def4ecf","sha256:a9bf4adf416ad58ebc23a2548ef07e819a6993d63c007265766dc2694ba2ca16"],"state_sha256":"7d385955b46b23ab9b843d88db1a979d6359eb10b5a1aee2f8313dc1b41329d4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XrckFKJVE+mOlaKPA4w7QsG3OCE1T5NmAaTh2Jg4pi1EY+W2ZKRzyPq9w9iL2H2SalQps6U03Bzr5ADDzrCQBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T08:02:31.350629Z","bundle_sha256":"5d078d906b24ca6caba9aacbeaaee7405fad0f790ccbf28f911dca7f27dc901d"}}