{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:JX2XAJQ5YP2JLFTAF2GPVOEYLW","short_pith_number":"pith:JX2XAJQ5","canonical_record":{"source":{"id":"1101.2525","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-01-13T10:07:24Z","cross_cats_sorted":[],"title_canon_sha256":"09b770c2c6f5b0582751ce302905445849446dc08976ddcb6ea57ac3d8d5f1aa","abstract_canon_sha256":"e74fae0a79cc3fb084e505970d69ad5075ff51bdc08fa016b61b7f2e955b4e6c"},"schema_version":"1.0"},"canonical_sha256":"4df570261dc3f49596602e8cfab8985db8bf2740de97bfdb719df03c66e6ae9f","source":{"kind":"arxiv","id":"1101.2525","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.2525","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"arxiv_version","alias_value":"1101.2525v1","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.2525","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"pith_short_12","alias_value":"JX2XAJQ5YP2J","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JX2XAJQ5YP2JLFTA","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JX2XAJQ5","created_at":"2026-05-18T12:26:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:JX2XAJQ5YP2JLFTAF2GPVOEYLW","target":"record","payload":{"canonical_record":{"source":{"id":"1101.2525","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-01-13T10:07:24Z","cross_cats_sorted":[],"title_canon_sha256":"09b770c2c6f5b0582751ce302905445849446dc08976ddcb6ea57ac3d8d5f1aa","abstract_canon_sha256":"e74fae0a79cc3fb084e505970d69ad5075ff51bdc08fa016b61b7f2e955b4e6c"},"schema_version":"1.0"},"canonical_sha256":"4df570261dc3f49596602e8cfab8985db8bf2740de97bfdb719df03c66e6ae9f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:40.522150Z","signature_b64":"f6qj4M+8rXJX7or9W/9fM03hFCEPR72KoC0yyknnaMVUyQMUcrBw4wCO6RFlFSY2TM8HzRAF9tv89jPwJtsABQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4df570261dc3f49596602e8cfab8985db8bf2740de97bfdb719df03c66e6ae9f","last_reissued_at":"2026-05-18T02:03:40.521493Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:40.521493Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1101.2525","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":"2026-05-18T02:03:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5pdVty8ds5VI9rcaALZK3xVCNzKdTRDCWf7nWKF2ws5xZ/0aIIbZgW0t3p3BcHm17b0Imuc2e6zyUYTkOtSTDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:57:54.686022Z"},"content_sha256":"914b80edffc1c4b8afc5076f646f286d8f5be4546f0e23eb9527e057f84e70cb","schema_version":"1.0","event_id":"sha256:914b80edffc1c4b8afc5076f646f286d8f5be4546f0e23eb9527e057f84e70cb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:JX2XAJQ5YP2JLFTAF2GPVOEYLW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Activity of comets: Gas Transport in the Near-Surface Porous Layers of a Cometary Nucleus","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"H. U. Keller, J. Blum, R. van Lieshout, Yu. Skorov","submitted_at":"2011-01-13T10:07:24Z","abstract_excerpt":"The gas transport through non-volatile random porous media is investigated numerically. We extend our previous research of the transport of molecules inside the uppermost layer of a cometary surface (Skorov and Rickmann, 1995; Skorov et al. 2001). We assess the validity of the simplified capillary model and its assumptions to simulate the gas flux trough the porous dust mantle as it has been applied in cometary physics. A new microphysical computational model for molecular transport in random porous media formed by packed spheres is presented. The main transport characteristics such as the mea"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.2525","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":"2026-05-18T02:03:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r3YUUuNJL/JuA0TKE3/+BU3uSrSOOaaDwVrb03bMs/tbiPQ4gwVC+CnuZL+EqK6xACBsYjtqJtKE8TjeQDewBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:57:54.686384Z"},"content_sha256":"7910d9f85a022aae49a8d0be03fa18625efb4e675abd21f2488a6274a2dcb8be","schema_version":"1.0","event_id":"sha256:7910d9f85a022aae49a8d0be03fa18625efb4e675abd21f2488a6274a2dcb8be"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/bundle.json","state_url":"https://pith.science/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/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":"2026-05-30T08:57:54Z","links":{"resolver":"https://pith.science/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW","bundle":"https://pith.science/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/bundle.json","state":"https://pith.science/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JX2XAJQ5YP2JLFTAF2GPVOEYLW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:JX2XAJQ5YP2JLFTAF2GPVOEYLW","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":"e74fae0a79cc3fb084e505970d69ad5075ff51bdc08fa016b61b7f2e955b4e6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-01-13T10:07:24Z","title_canon_sha256":"09b770c2c6f5b0582751ce302905445849446dc08976ddcb6ea57ac3d8d5f1aa"},"schema_version":"1.0","source":{"id":"1101.2525","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1101.2525","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"arxiv_version","alias_value":"1101.2525v1","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.2525","created_at":"2026-05-18T02:03:40Z"},{"alias_kind":"pith_short_12","alias_value":"JX2XAJQ5YP2J","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_16","alias_value":"JX2XAJQ5YP2JLFTA","created_at":"2026-05-18T12:26:32Z"},{"alias_kind":"pith_short_8","alias_value":"JX2XAJQ5","created_at":"2026-05-18T12:26:32Z"}],"graph_snapshots":[{"event_id":"sha256:7910d9f85a022aae49a8d0be03fa18625efb4e675abd21f2488a6274a2dcb8be","target":"graph","created_at":"2026-05-18T02:03:40Z","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":"The gas transport through non-volatile random porous media is investigated numerically. We extend our previous research of the transport of molecules inside the uppermost layer of a cometary surface (Skorov and Rickmann, 1995; Skorov et al. 2001). We assess the validity of the simplified capillary model and its assumptions to simulate the gas flux trough the porous dust mantle as it has been applied in cometary physics. A new microphysical computational model for molecular transport in random porous media formed by packed spheres is presented. The main transport characteristics such as the mea","authors_text":"H. U. Keller, J. Blum, R. van Lieshout, Yu. Skorov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-01-13T10:07:24Z","title":"Activity of comets: Gas Transport in the Near-Surface Porous Layers of a Cometary Nucleus"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.2525","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":"sha256:914b80edffc1c4b8afc5076f646f286d8f5be4546f0e23eb9527e057f84e70cb","target":"record","created_at":"2026-05-18T02:03:40Z","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":"e74fae0a79cc3fb084e505970d69ad5075ff51bdc08fa016b61b7f2e955b4e6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2011-01-13T10:07:24Z","title_canon_sha256":"09b770c2c6f5b0582751ce302905445849446dc08976ddcb6ea57ac3d8d5f1aa"},"schema_version":"1.0","source":{"id":"1101.2525","kind":"arxiv","version":1}},"canonical_sha256":"4df570261dc3f49596602e8cfab8985db8bf2740de97bfdb719df03c66e6ae9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4df570261dc3f49596602e8cfab8985db8bf2740de97bfdb719df03c66e6ae9f","first_computed_at":"2026-05-18T02:03:40.521493Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:03:40.521493Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"f6qj4M+8rXJX7or9W/9fM03hFCEPR72KoC0yyknnaMVUyQMUcrBw4wCO6RFlFSY2TM8HzRAF9tv89jPwJtsABQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:03:40.522150Z","signed_message":"canonical_sha256_bytes"},"source_id":"1101.2525","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:914b80edffc1c4b8afc5076f646f286d8f5be4546f0e23eb9527e057f84e70cb","sha256:7910d9f85a022aae49a8d0be03fa18625efb4e675abd21f2488a6274a2dcb8be"],"state_sha256":"d1083263c78369aa671939bd0d2a24cd9b9093143d02e975cde9b417b6860028"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PlAm9SKnIFi5nuaKS6LqCQJUP7gg3yfO2URJHBp7yk6nS3e3JjvoyWVIvObjUx4aum5NsTiWW6A7HuitbppDAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:57:54.688494Z","bundle_sha256":"2d8e4037c5b5c94981d4a3eedc6768680941e4563127d2c9f05870778ad70ce2"}}