{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:NBBSDM4V7M6YIIG2U4FS4GE5U4","short_pith_number":"pith:NBBSDM4V","canonical_record":{"source":{"id":"1709.00221","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-09-01T09:46:43Z","cross_cats_sorted":[],"title_canon_sha256":"7d6304a7644a16f5ae90d0f625423089f72759a5c494f14b1020826609430f0e","abstract_canon_sha256":"e569dade4c13145bde2444386844ae85807c35b8503dc1f20ecf960c45851b8a"},"schema_version":"1.0"},"canonical_sha256":"684321b395fb3d8420daa70b2e189da700163b16dd657ca531fd487d362f2b29","source":{"kind":"arxiv","id":"1709.00221","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.00221","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"arxiv_version","alias_value":"1709.00221v2","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.00221","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"pith_short_12","alias_value":"NBBSDM4V7M6Y","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"NBBSDM4V7M6YIIG2","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"NBBSDM4V","created_at":"2026-05-18T12:31:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:NBBSDM4V7M6YIIG2U4FS4GE5U4","target":"record","payload":{"canonical_record":{"source":{"id":"1709.00221","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-09-01T09:46:43Z","cross_cats_sorted":[],"title_canon_sha256":"7d6304a7644a16f5ae90d0f625423089f72759a5c494f14b1020826609430f0e","abstract_canon_sha256":"e569dade4c13145bde2444386844ae85807c35b8503dc1f20ecf960c45851b8a"},"schema_version":"1.0"},"canonical_sha256":"684321b395fb3d8420daa70b2e189da700163b16dd657ca531fd487d362f2b29","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:25:55.289349Z","signature_b64":"g/SGhGqumB4cyEoZwJadUiwaiqiL2bG6KNwENuhys5do3amYphxJIKzZQ+lL/cbhFzOjhoh8F57+p7vSPUrYBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"684321b395fb3d8420daa70b2e189da700163b16dd657ca531fd487d362f2b29","last_reissued_at":"2026-05-18T00:25:55.288868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:25:55.288868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.00221","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:25:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bg8B9gyeTuBefQCd2ncamkmt/hEs9ctlQgyL4gEeKPQzzplCy8bOde5ggJ/sTgZ9boLLFfM5MVLpN4Cf6F/0Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T23:20:25.671911Z"},"content_sha256":"8a5e0396570a46d35eae4e51d105404714bece5afce962a1f64453961e22527e","schema_version":"1.0","event_id":"sha256:8a5e0396570a46d35eae4e51d105404714bece5afce962a1f64453961e22527e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:NBBSDM4V7M6YIIG2U4FS4GE5U4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tomographic Study of Internal Erosion of Particle Flows in Porous Media","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Falk K. Wittel, Filippo Bianchi, Hans J. Herrmann, Marcel Thielmann, Pavel Trtik","submitted_at":"2017-09-01T09:46:43Z","abstract_excerpt":"In particle-laden flows through porous media, porosity and permeability are significantly affected by the deposition and erosion of particles. Experiments show that the permeability evolution of a porous medium with respect to a particle suspension is not smooth, but rather exhibits significant jumps followed by longer periods of continuous permeability decrease. Their origin seems to be related to internal flow path reorganization by avalanches of deposited material due to erosion inside the porous medium. We apply neutron tomography to resolve the spatio-temporal evolution of the pore space "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.00221","kind":"arxiv","version":2},"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":"2026-05-18T00:25:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NIifRNOrsmg7GZ1cepO/9hB4hsVROOrTo+1B5mjEfsMi035jdajVO8GppDCMCLliDUhDRNBta161IDfJT0VGCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T23:20:25.672575Z"},"content_sha256":"089b1eaf00755b0340b3f791f4ad7ceb4be72a69690932c06c33661dcba22118","schema_version":"1.0","event_id":"sha256:089b1eaf00755b0340b3f791f4ad7ceb4be72a69690932c06c33661dcba22118"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/bundle.json","state_url":"https://pith.science/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/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":"2026-05-27T23:20:25Z","links":{"resolver":"https://pith.science/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4","bundle":"https://pith.science/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/bundle.json","state":"https://pith.science/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NBBSDM4V7M6YIIG2U4FS4GE5U4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:NBBSDM4V7M6YIIG2U4FS4GE5U4","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":"e569dade4c13145bde2444386844ae85807c35b8503dc1f20ecf960c45851b8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-09-01T09:46:43Z","title_canon_sha256":"7d6304a7644a16f5ae90d0f625423089f72759a5c494f14b1020826609430f0e"},"schema_version":"1.0","source":{"id":"1709.00221","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.00221","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"arxiv_version","alias_value":"1709.00221v2","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.00221","created_at":"2026-05-18T00:25:55Z"},{"alias_kind":"pith_short_12","alias_value":"NBBSDM4V7M6Y","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"NBBSDM4V7M6YIIG2","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"NBBSDM4V","created_at":"2026-05-18T12:31:31Z"}],"graph_snapshots":[{"event_id":"sha256:089b1eaf00755b0340b3f791f4ad7ceb4be72a69690932c06c33661dcba22118","target":"graph","created_at":"2026-05-18T00:25:55Z","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":"In particle-laden flows through porous media, porosity and permeability are significantly affected by the deposition and erosion of particles. Experiments show that the permeability evolution of a porous medium with respect to a particle suspension is not smooth, but rather exhibits significant jumps followed by longer periods of continuous permeability decrease. Their origin seems to be related to internal flow path reorganization by avalanches of deposited material due to erosion inside the porous medium. We apply neutron tomography to resolve the spatio-temporal evolution of the pore space ","authors_text":"Falk K. Wittel, Filippo Bianchi, Hans J. Herrmann, Marcel Thielmann, Pavel Trtik","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-09-01T09:46:43Z","title":"Tomographic Study of Internal Erosion of Particle Flows in Porous Media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.00221","kind":"arxiv","version":2},"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":"sha256:8a5e0396570a46d35eae4e51d105404714bece5afce962a1f64453961e22527e","target":"record","created_at":"2026-05-18T00:25:55Z","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":"e569dade4c13145bde2444386844ae85807c35b8503dc1f20ecf960c45851b8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2017-09-01T09:46:43Z","title_canon_sha256":"7d6304a7644a16f5ae90d0f625423089f72759a5c494f14b1020826609430f0e"},"schema_version":"1.0","source":{"id":"1709.00221","kind":"arxiv","version":2}},"canonical_sha256":"684321b395fb3d8420daa70b2e189da700163b16dd657ca531fd487d362f2b29","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"684321b395fb3d8420daa70b2e189da700163b16dd657ca531fd487d362f2b29","first_computed_at":"2026-05-18T00:25:55.288868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:25:55.288868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"g/SGhGqumB4cyEoZwJadUiwaiqiL2bG6KNwENuhys5do3amYphxJIKzZQ+lL/cbhFzOjhoh8F57+p7vSPUrYBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:25:55.289349Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.00221","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8a5e0396570a46d35eae4e51d105404714bece5afce962a1f64453961e22527e","sha256:089b1eaf00755b0340b3f791f4ad7ceb4be72a69690932c06c33661dcba22118"],"state_sha256":"ac5f9ee2332b26373c8766bf4f08f752db1bea8fedaa52c571d686e362b5c780"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"E1C/7cAVZZyHFY/+WumlC8YtK9hDEX4QZRjSzcJBFU63VqLHpgSN+HGfYhqFWTIieo48x+V1J4DPGEbtBw2aDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T23:20:25.675259Z","bundle_sha256":"5630522bcfe31dde2328bea56783c9f850a03da89f1c52f142e570338c920b89"}}