{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YRKNFHYYHRQKKTO64X4GMJ3CXH","short_pith_number":"pith:YRKNFHYY","canonical_record":{"source":{"id":"1807.07833","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-07-20T13:34:10Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"158f3350606ba003ca221f15b1ec9bfae0ae9c8c9c124df9f043a6c656ed233e","abstract_canon_sha256":"c642a5149ad3f833f34ed04f797ebb2807312c95b56725f7cbef603e99aa1fff"},"schema_version":"1.0"},"canonical_sha256":"c454d29f183c60a54ddee5f8662762b9dfa6a276808230bfc8011dd7a499826b","source":{"kind":"arxiv","id":"1807.07833","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.07833","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"arxiv_version","alias_value":"1807.07833v1","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.07833","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"pith_short_12","alias_value":"YRKNFHYYHRQK","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YRKNFHYYHRQKKTO6","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YRKNFHYY","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YRKNFHYYHRQKKTO64X4GMJ3CXH","target":"record","payload":{"canonical_record":{"source":{"id":"1807.07833","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-07-20T13:34:10Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"158f3350606ba003ca221f15b1ec9bfae0ae9c8c9c124df9f043a6c656ed233e","abstract_canon_sha256":"c642a5149ad3f833f34ed04f797ebb2807312c95b56725f7cbef603e99aa1fff"},"schema_version":"1.0"},"canonical_sha256":"c454d29f183c60a54ddee5f8662762b9dfa6a276808230bfc8011dd7a499826b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:07:33.731325Z","signature_b64":"VtKPGMvz3eQhvK7Btd9/+jXjQsU2ShzqgkS5IBVDwSP8p9pqag82CFkb4ALcaWFsut+SYI0WEcOCA0gQLMD7AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c454d29f183c60a54ddee5f8662762b9dfa6a276808230bfc8011dd7a499826b","last_reissued_at":"2026-05-18T00:07:33.730731Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:07:33.730731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.07833","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":"2026-05-18T00:07:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"45wyXQVy1iBOQT9nWtlXGPSb1dBXpYGrJGK7hfipbtGjlq1UkjsnYv5vopOtxYLjd6nYNHHom5+b2NF8K5N9AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:51:39.152211Z"},"content_sha256":"19740f02ec236d3d8741440c0e755002e26af5c8cea85c5205bc021698183c2f","schema_version":"1.0","event_id":"sha256:19740f02ec236d3d8741440c0e755002e26af5c8cea85c5205bc021698183c2f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YRKNFHYYHRQKKTO64X4GMJ3CXH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Micromechanics of intruder motion in wet granular medium","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"physics.flu-dyn","authors_text":"Andreea Panaitescu, Arshad Kudrolli, Rausan Jewel","submitted_at":"2018-07-20T13:34:10Z","abstract_excerpt":"We investigate the effective friction encountered by an intruder moving through a sedimented medium which consists of transparent granular hydrogels immersed in water, and the resulting motion of the medium. We show that the effective friction $\\mu_e$ on a spherical intruder is captured by the inertial number $I$ given by the ratio of the time scale over which the intruder moves and the inertial time scale of the granular medium set by the overburden pressure. Further, $\\mu_e$ is described by the function $\\mu_e(I) = \\mu_s + \\alpha I^\\beta$, where $\\mu_s$ is the static friction, and $\\alpha$ a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.07833","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":"2026-05-18T00:07:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x+KsqRTY9CKK+j3ieFWhHDDCQ7XOnExSpeQ6EQHrLkFDQbWz62SBIs8JxyDAfGFe+axaWsBKKwmcAOWbilqOCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:51:39.152619Z"},"content_sha256":"0eef9b92bdb0f9dfd577b316640855fdd37c344984657b38ff63ab5f805aca51","schema_version":"1.0","event_id":"sha256:0eef9b92bdb0f9dfd577b316640855fdd37c344984657b38ff63ab5f805aca51"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/bundle.json","state_url":"https://pith.science/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/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":"2026-05-28T08:51:39Z","links":{"resolver":"https://pith.science/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH","bundle":"https://pith.science/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/bundle.json","state":"https://pith.science/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YRKNFHYYHRQKKTO64X4GMJ3CXH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YRKNFHYYHRQKKTO64X4GMJ3CXH","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":"c642a5149ad3f833f34ed04f797ebb2807312c95b56725f7cbef603e99aa1fff","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-07-20T13:34:10Z","title_canon_sha256":"158f3350606ba003ca221f15b1ec9bfae0ae9c8c9c124df9f043a6c656ed233e"},"schema_version":"1.0","source":{"id":"1807.07833","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.07833","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"arxiv_version","alias_value":"1807.07833v1","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.07833","created_at":"2026-05-18T00:07:33Z"},{"alias_kind":"pith_short_12","alias_value":"YRKNFHYYHRQK","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YRKNFHYYHRQKKTO6","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YRKNFHYY","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:0eef9b92bdb0f9dfd577b316640855fdd37c344984657b38ff63ab5f805aca51","target":"graph","created_at":"2026-05-18T00:07:33Z","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":"We investigate the effective friction encountered by an intruder moving through a sedimented medium which consists of transparent granular hydrogels immersed in water, and the resulting motion of the medium. We show that the effective friction $\\mu_e$ on a spherical intruder is captured by the inertial number $I$ given by the ratio of the time scale over which the intruder moves and the inertial time scale of the granular medium set by the overburden pressure. Further, $\\mu_e$ is described by the function $\\mu_e(I) = \\mu_s + \\alpha I^\\beta$, where $\\mu_s$ is the static friction, and $\\alpha$ a","authors_text":"Andreea Panaitescu, Arshad Kudrolli, Rausan Jewel","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-07-20T13:34:10Z","title":"Micromechanics of intruder motion in wet granular medium"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.07833","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":"sha256:19740f02ec236d3d8741440c0e755002e26af5c8cea85c5205bc021698183c2f","target":"record","created_at":"2026-05-18T00:07:33Z","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":"c642a5149ad3f833f34ed04f797ebb2807312c95b56725f7cbef603e99aa1fff","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-07-20T13:34:10Z","title_canon_sha256":"158f3350606ba003ca221f15b1ec9bfae0ae9c8c9c124df9f043a6c656ed233e"},"schema_version":"1.0","source":{"id":"1807.07833","kind":"arxiv","version":1}},"canonical_sha256":"c454d29f183c60a54ddee5f8662762b9dfa6a276808230bfc8011dd7a499826b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c454d29f183c60a54ddee5f8662762b9dfa6a276808230bfc8011dd7a499826b","first_computed_at":"2026-05-18T00:07:33.730731Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:07:33.730731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VtKPGMvz3eQhvK7Btd9/+jXjQsU2ShzqgkS5IBVDwSP8p9pqag82CFkb4ALcaWFsut+SYI0WEcOCA0gQLMD7AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:07:33.731325Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.07833","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:19740f02ec236d3d8741440c0e755002e26af5c8cea85c5205bc021698183c2f","sha256:0eef9b92bdb0f9dfd577b316640855fdd37c344984657b38ff63ab5f805aca51"],"state_sha256":"54cb565b88cc3d4b77c0b3dddeb1ce10e82a2709f04eaf7a42c10c894b8d828d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"x9m+ccnVMA3BgA33UxE+PGdIVr5TZ9/mvpUzZ8u1l4NhC+IKIR/nlWrRBAd3y8NbeC9oKDBpqRnJj1o1t2XhCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T08:51:39.154970Z","bundle_sha256":"97892b054ee4982396d6e7f783c17d34941a1762b563ec8bd2469abecf4cc7d9"}}