{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IZCAAX6RXX7TCYUVU4WHXTUB3P","short_pith_number":"pith:IZCAAX6R","canonical_record":{"source":{"id":"1809.01784","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-09-06T01:31:40Z","cross_cats_sorted":[],"title_canon_sha256":"eb01e319c33eec98296a45e4e518db6628d1154ed816563bbac33e55a6208659","abstract_canon_sha256":"dbabedbddbcccd81a833b4c2bac97ae65076798e8475e6659417799052559fcf"},"schema_version":"1.0"},"canonical_sha256":"4644005fd1bdff316295a72c7bce81dbe8643c37b74522894d8531e38c8c2e3d","source":{"kind":"arxiv","id":"1809.01784","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01784","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01784v1","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01784","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"pith_short_12","alias_value":"IZCAAX6RXX7T","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IZCAAX6RXX7TCYUV","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IZCAAX6R","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IZCAAX6RXX7TCYUVU4WHXTUB3P","target":"record","payload":{"canonical_record":{"source":{"id":"1809.01784","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-09-06T01:31:40Z","cross_cats_sorted":[],"title_canon_sha256":"eb01e319c33eec98296a45e4e518db6628d1154ed816563bbac33e55a6208659","abstract_canon_sha256":"dbabedbddbcccd81a833b4c2bac97ae65076798e8475e6659417799052559fcf"},"schema_version":"1.0"},"canonical_sha256":"4644005fd1bdff316295a72c7bce81dbe8643c37b74522894d8531e38c8c2e3d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:37.785517Z","signature_b64":"3TqFY9/5dr/RWnK9mbQnQFDMYfB0SXmzOwKzQtpTB//irvCMV3O54fhyZPSb8EeAA0Bu7YekOeKBiJx6V3JHAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4644005fd1bdff316295a72c7bce81dbe8643c37b74522894d8531e38c8c2e3d","last_reissued_at":"2026-05-17T23:58:37.784800Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:37.784800Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.01784","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":"2026-05-17T23:58:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5tK+OwaqPkzcBhz6CiPV0dpQVmws7ZlK+TkOXjnN75GTRcCi9a/WBN/XxcySvZWmwJG2YJzdDNSySAbuiYfzCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T22:14:29.987292Z"},"content_sha256":"7848faa8ccaf278f06fa8b030b6fd0acc63cbd24ea1e99cf3c50e2d4a136a7fc","schema_version":"1.0","event_id":"sha256:7848faa8ccaf278f06fa8b030b6fd0acc63cbd24ea1e99cf3c50e2d4a136a7fc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IZCAAX6RXX7TCYUVU4WHXTUB3P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Synthetic direct demodulation method and its applications in Insight-HXMT data analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Yang Zhang, Zhuoxi Huo","submitted_at":"2018-09-06T01:31:40Z","abstract_excerpt":"Aims. A modulation equation relates the observed data to the object where the observation is approximated by a linear system. Reconstructing the object from the observed data is therefore is equivalent to solving the modulation equation. In this work we present the synthetic direct demodulation (synDD) method to reduce the dimensionality of a general modulation equation and solve the equation in its sparse representation.\n  Methods. A principal component analysis is used to reduce the dimensionality of the kernel matrix and k-means clustering is applied to its sparse representation in order to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01784","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":"2026-05-17T23:58:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HJWXp3bVwczt8XuNkIPKyCVWujy0/HB+GFy4rK0+XQ5dDs5iyibgh/MS+qncB4JjA3RGd4aibpuAfvpUAObOAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T22:14:29.987956Z"},"content_sha256":"0be5c0a0e408b2bd4416c355314faf9367c47770e65e990bb340ecb00151046e","schema_version":"1.0","event_id":"sha256:0be5c0a0e408b2bd4416c355314faf9367c47770e65e990bb340ecb00151046e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/bundle.json","state_url":"https://pith.science/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/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":"2026-06-06T22:14:29Z","links":{"resolver":"https://pith.science/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P","bundle":"https://pith.science/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/bundle.json","state":"https://pith.science/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IZCAAX6RXX7TCYUVU4WHXTUB3P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IZCAAX6RXX7TCYUVU4WHXTUB3P","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":"dbabedbddbcccd81a833b4c2bac97ae65076798e8475e6659417799052559fcf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-09-06T01:31:40Z","title_canon_sha256":"eb01e319c33eec98296a45e4e518db6628d1154ed816563bbac33e55a6208659"},"schema_version":"1.0","source":{"id":"1809.01784","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.01784","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"arxiv_version","alias_value":"1809.01784v1","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.01784","created_at":"2026-05-17T23:58:37Z"},{"alias_kind":"pith_short_12","alias_value":"IZCAAX6RXX7T","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"IZCAAX6RXX7TCYUV","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"IZCAAX6R","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:0be5c0a0e408b2bd4416c355314faf9367c47770e65e990bb340ecb00151046e","target":"graph","created_at":"2026-05-17T23:58:37Z","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":"Aims. A modulation equation relates the observed data to the object where the observation is approximated by a linear system. Reconstructing the object from the observed data is therefore is equivalent to solving the modulation equation. In this work we present the synthetic direct demodulation (synDD) method to reduce the dimensionality of a general modulation equation and solve the equation in its sparse representation.\n  Methods. A principal component analysis is used to reduce the dimensionality of the kernel matrix and k-means clustering is applied to its sparse representation in order to","authors_text":"Yang Zhang, Zhuoxi Huo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-09-06T01:31:40Z","title":"Synthetic direct demodulation method and its applications in Insight-HXMT data analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.01784","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":"sha256:7848faa8ccaf278f06fa8b030b6fd0acc63cbd24ea1e99cf3c50e2d4a136a7fc","target":"record","created_at":"2026-05-17T23:58:37Z","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":"dbabedbddbcccd81a833b4c2bac97ae65076798e8475e6659417799052559fcf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-09-06T01:31:40Z","title_canon_sha256":"eb01e319c33eec98296a45e4e518db6628d1154ed816563bbac33e55a6208659"},"schema_version":"1.0","source":{"id":"1809.01784","kind":"arxiv","version":1}},"canonical_sha256":"4644005fd1bdff316295a72c7bce81dbe8643c37b74522894d8531e38c8c2e3d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4644005fd1bdff316295a72c7bce81dbe8643c37b74522894d8531e38c8c2e3d","first_computed_at":"2026-05-17T23:58:37.784800Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:37.784800Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3TqFY9/5dr/RWnK9mbQnQFDMYfB0SXmzOwKzQtpTB//irvCMV3O54fhyZPSb8EeAA0Bu7YekOeKBiJx6V3JHAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:37.785517Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.01784","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7848faa8ccaf278f06fa8b030b6fd0acc63cbd24ea1e99cf3c50e2d4a136a7fc","sha256:0be5c0a0e408b2bd4416c355314faf9367c47770e65e990bb340ecb00151046e"],"state_sha256":"3ec3f05d1d52c5c90ca1696fddac352ab450e72d089a81f68a34c6620b1d30a0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bFBOD+WwqXrBHRprJdRGC54U5nsNeVX9hGoxGthj+v2y3yqON+X5BhmxvacVt6xY8VKGPVBHXEPNZ+57nnkrDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T22:14:29.994601Z","bundle_sha256":"cc6325fbc535e25f68d48a5dc26a9365381bcba848a6e2e093a69089fabc89cc"}}