{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:GXSOHDGQDF37U74JSETR2V525X","short_pith_number":"pith:GXSOHDGQ","canonical_record":{"source":{"id":"1705.00893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-05-02T10:34:39Z","cross_cats_sorted":[],"title_canon_sha256":"947f4cd465f3422480b204412ac326337ebfcce72e2af05f8cc7c5374cd61e4d","abstract_canon_sha256":"0ea4aca1410434167241b9626612c2f18a3f14a4af9886cd937a8dff7cdd28e3"},"schema_version":"1.0"},"canonical_sha256":"35e4e38cd01977fa7f8991271d57baedef398e5358d886e3ec71aaa51e000c7b","source":{"kind":"arxiv","id":"1705.00893","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.00893","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"arxiv_version","alias_value":"1705.00893v1","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.00893","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"pith_short_12","alias_value":"GXSOHDGQDF37","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GXSOHDGQDF37U74J","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GXSOHDGQ","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:GXSOHDGQDF37U74JSETR2V525X","target":"record","payload":{"canonical_record":{"source":{"id":"1705.00893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-05-02T10:34:39Z","cross_cats_sorted":[],"title_canon_sha256":"947f4cd465f3422480b204412ac326337ebfcce72e2af05f8cc7c5374cd61e4d","abstract_canon_sha256":"0ea4aca1410434167241b9626612c2f18a3f14a4af9886cd937a8dff7cdd28e3"},"schema_version":"1.0"},"canonical_sha256":"35e4e38cd01977fa7f8991271d57baedef398e5358d886e3ec71aaa51e000c7b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:43:50.057306Z","signature_b64":"fuPznhD1G4lkrKUqojOqwagjJSJU03NP156JRXMzh11Magh2iFU2sN3yoVE9Df7olL1OztfOoCqiDGGnlJXKBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"35e4e38cd01977fa7f8991271d57baedef398e5358d886e3ec71aaa51e000c7b","last_reissued_at":"2026-05-18T00:43:50.056812Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:43:50.056812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.00893","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":"2026-05-18T00:43:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pMgBbLZxOKfGccps/j/Zdo/8IVYMBBw5l/GURwkElvwpvuz2pWq8cuv4IN4N33M3FZIVF4F9WfLCywpfRBpWDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T21:10:44.100479Z"},"content_sha256":"aa3654a2f5e4a0a68569362c7b1f20168d6ca5c6f8c0cbbe008ca21cc2a18508","schema_version":"1.0","event_id":"sha256:aa3654a2f5e4a0a68569362c7b1f20168d6ca5c6f8c0cbbe008ca21cc2a18508"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:GXSOHDGQDF37U74JSETR2V525X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Numerical Simulations of Regolith Sampling Processes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.EP","authors_text":"Christoph M. Sch\\\"afer, Robert Buchwald, Roland Speith, Samuel Scherrer, Thomas I. Maindl, Wilhelm Kley","submitted_at":"2017-05-02T10:34:39Z","abstract_excerpt":"We present recent improvements in the simulation of regolith sampling processes in microgravity using the numerical particle method smooth particle hydrodynamics (SPH). We use an elastic-plastic soil constitutive model for large deformation and failure flows for dynamical behaviour of regolith. In the context of projected small body (asteroid or small moons) sample return missions, we investigate the efficiency and feasibility of a particular material sampling method: Brushes sweep material from the asteroid's surface into a collecting tray. We analyze the influence of different material param"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.00893","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":"2026-05-18T00:43:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BHoFb5ZcOFDGAyH6nmoh87Mn6FXmahfUvxL+DavLQeD5yc2p6FvW9NvyN536FKNUjRLSkqiJd28QSCvzrDxmBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T21:10:44.100828Z"},"content_sha256":"25ff39dffd52ec7e6ff5d4e8cb99fe15c17fefec4cc0af5f5ceb9466698e27e0","schema_version":"1.0","event_id":"sha256:25ff39dffd52ec7e6ff5d4e8cb99fe15c17fefec4cc0af5f5ceb9466698e27e0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GXSOHDGQDF37U74JSETR2V525X/bundle.json","state_url":"https://pith.science/pith/GXSOHDGQDF37U74JSETR2V525X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GXSOHDGQDF37U74JSETR2V525X/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":"2026-05-30T21:10:44Z","links":{"resolver":"https://pith.science/pith/GXSOHDGQDF37U74JSETR2V525X","bundle":"https://pith.science/pith/GXSOHDGQDF37U74JSETR2V525X/bundle.json","state":"https://pith.science/pith/GXSOHDGQDF37U74JSETR2V525X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GXSOHDGQDF37U74JSETR2V525X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:GXSOHDGQDF37U74JSETR2V525X","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":"0ea4aca1410434167241b9626612c2f18a3f14a4af9886cd937a8dff7cdd28e3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-05-02T10:34:39Z","title_canon_sha256":"947f4cd465f3422480b204412ac326337ebfcce72e2af05f8cc7c5374cd61e4d"},"schema_version":"1.0","source":{"id":"1705.00893","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.00893","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"arxiv_version","alias_value":"1705.00893v1","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.00893","created_at":"2026-05-18T00:43:50Z"},{"alias_kind":"pith_short_12","alias_value":"GXSOHDGQDF37","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GXSOHDGQDF37U74J","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GXSOHDGQ","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:25ff39dffd52ec7e6ff5d4e8cb99fe15c17fefec4cc0af5f5ceb9466698e27e0","target":"graph","created_at":"2026-05-18T00:43:50Z","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 present recent improvements in the simulation of regolith sampling processes in microgravity using the numerical particle method smooth particle hydrodynamics (SPH). We use an elastic-plastic soil constitutive model for large deformation and failure flows for dynamical behaviour of regolith. In the context of projected small body (asteroid or small moons) sample return missions, we investigate the efficiency and feasibility of a particular material sampling method: Brushes sweep material from the asteroid's surface into a collecting tray. We analyze the influence of different material param","authors_text":"Christoph M. Sch\\\"afer, Robert Buchwald, Roland Speith, Samuel Scherrer, Thomas I. Maindl, Wilhelm Kley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-05-02T10:34:39Z","title":"Numerical Simulations of Regolith Sampling Processes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.00893","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:aa3654a2f5e4a0a68569362c7b1f20168d6ca5c6f8c0cbbe008ca21cc2a18508","target":"record","created_at":"2026-05-18T00:43:50Z","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":"0ea4aca1410434167241b9626612c2f18a3f14a4af9886cd937a8dff7cdd28e3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2017-05-02T10:34:39Z","title_canon_sha256":"947f4cd465f3422480b204412ac326337ebfcce72e2af05f8cc7c5374cd61e4d"},"schema_version":"1.0","source":{"id":"1705.00893","kind":"arxiv","version":1}},"canonical_sha256":"35e4e38cd01977fa7f8991271d57baedef398e5358d886e3ec71aaa51e000c7b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"35e4e38cd01977fa7f8991271d57baedef398e5358d886e3ec71aaa51e000c7b","first_computed_at":"2026-05-18T00:43:50.056812Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:43:50.056812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fuPznhD1G4lkrKUqojOqwagjJSJU03NP156JRXMzh11Magh2iFU2sN3yoVE9Df7olL1OztfOoCqiDGGnlJXKBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:43:50.057306Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.00893","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa3654a2f5e4a0a68569362c7b1f20168d6ca5c6f8c0cbbe008ca21cc2a18508","sha256:25ff39dffd52ec7e6ff5d4e8cb99fe15c17fefec4cc0af5f5ceb9466698e27e0"],"state_sha256":"1a2ad40a5b159c2dae59e092b579e813c33d1c45ab46aea8e35ff8dd572f9294"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gACbboZYWHRkXdGKfTYREU3Fc3TTgsiRPEzbVpJ27AtN8jGZeJN/x+Ie2niuB7Xsf01A2P/b3JLP3UYTL58iDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T21:10:44.102809Z","bundle_sha256":"feee0d181a7a65ef5c09250b88b04989663e00fe6a8fc958e097c95436178490"}}