{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:SHCFFQS75BN44YXKDKONV37CNL","short_pith_number":"pith:SHCFFQS7","canonical_record":{"source":{"id":"1212.2934","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2012-12-12T19:14:00Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"c09bca1d15a4767353981a5d39f100e2aa271680a1ef8403343a4628407915fc","abstract_canon_sha256":"9a5b68f5136f5470fa02db1ca219039d1ffd3c7cf7b390f964eb896e034ffa67"},"schema_version":"1.0"},"canonical_sha256":"91c452c25fe85bce62ea1a9cdaefe26acfb87e1b37d2829e03036a947136d7dc","source":{"kind":"arxiv","id":"1212.2934","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.2934","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"arxiv_version","alias_value":"1212.2934v2","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.2934","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"pith_short_12","alias_value":"SHCFFQS75BN4","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SHCFFQS75BN44YXK","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SHCFFQS7","created_at":"2026-05-18T12:27:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:SHCFFQS75BN44YXKDKONV37CNL","target":"record","payload":{"canonical_record":{"source":{"id":"1212.2934","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2012-12-12T19:14:00Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"c09bca1d15a4767353981a5d39f100e2aa271680a1ef8403343a4628407915fc","abstract_canon_sha256":"9a5b68f5136f5470fa02db1ca219039d1ffd3c7cf7b390f964eb896e034ffa67"},"schema_version":"1.0"},"canonical_sha256":"91c452c25fe85bce62ea1a9cdaefe26acfb87e1b37d2829e03036a947136d7dc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:27:01.259175Z","signature_b64":"RlzGoKU4Y7BaePJBg/DkdpgnGVR2v5FvzrSrSm8P0TH8f4E4ZwJWqn0mt6H9gDQw7Nwh8PUBG6jMy9oycEG2BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"91c452c25fe85bce62ea1a9cdaefe26acfb87e1b37d2829e03036a947136d7dc","last_reissued_at":"2026-05-18T03:27:01.258780Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:27:01.258780Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1212.2934","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":"2026-05-18T03:27:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DWeoqh6TgomfaZSDWyukgZt1TtAdiee9SBuvci6Oq5x7lxtMa5WVJ/qzdY2XqUEsrwSW/vxDuvKEkx8T3BpuDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:07:54.728906Z"},"content_sha256":"cc079ff79ed2b2f811d0539b09234983016352eb6216781d15b7a31f55c0315f","schema_version":"1.0","event_id":"sha256:cc079ff79ed2b2f811d0539b09234983016352eb6216781d15b7a31f55c0315f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:SHCFFQS75BN44YXKDKONV37CNL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Large-scale Ferrofluid Simulations on Graphics Processing Units","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn"],"primary_cat":"physics.comp-ph","authors_text":"A. Yu. Polyakov, P. Hanggi, S. Denisov, T. V. Lyutyy, V. V. Reva","submitted_at":"2012-12-12T19:14:00Z","abstract_excerpt":"We present an approach to molecular-dynamics simulations of ferrofluids on graphics processing units (GPUs). Our numerical scheme is based on a GPU-oriented modification of the Barnes-Hut (BH) algorithm designed to increase the parallelism of computations. For an ensemble consisting of one million of ferromagnetic particles, the performance of the proposed algorithm on a Tesla M2050 GPU demonstrated a computational-time speed-up of four order of magnitude compared to the performance of the sequential All-Pairs (AP) algorithm on a single-core CPU, and two order of magnitude compared to the perf"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.2934","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":"2026-05-18T03:27:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pIvSlyIT7Y0nT1FifL6fswws+WHGGciqieQBs+G0vERl0FJ3OjTIdNeHZIn/IpGPJ7LSgcFITOAlmQ+HBRmiDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:07:54.729253Z"},"content_sha256":"377f3398cf910e952d3bb2d490ad252ddfe20dc7f5b8c264f6b38102080d6587","schema_version":"1.0","event_id":"sha256:377f3398cf910e952d3bb2d490ad252ddfe20dc7f5b8c264f6b38102080d6587"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SHCFFQS75BN44YXKDKONV37CNL/bundle.json","state_url":"https://pith.science/pith/SHCFFQS75BN44YXKDKONV37CNL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SHCFFQS75BN44YXKDKONV37CNL/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":"2026-06-02T23:07:54Z","links":{"resolver":"https://pith.science/pith/SHCFFQS75BN44YXKDKONV37CNL","bundle":"https://pith.science/pith/SHCFFQS75BN44YXKDKONV37CNL/bundle.json","state":"https://pith.science/pith/SHCFFQS75BN44YXKDKONV37CNL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SHCFFQS75BN44YXKDKONV37CNL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:SHCFFQS75BN44YXKDKONV37CNL","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":"9a5b68f5136f5470fa02db1ca219039d1ffd3c7cf7b390f964eb896e034ffa67","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2012-12-12T19:14:00Z","title_canon_sha256":"c09bca1d15a4767353981a5d39f100e2aa271680a1ef8403343a4628407915fc"},"schema_version":"1.0","source":{"id":"1212.2934","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.2934","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"arxiv_version","alias_value":"1212.2934v2","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.2934","created_at":"2026-05-18T03:27:01Z"},{"alias_kind":"pith_short_12","alias_value":"SHCFFQS75BN4","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"SHCFFQS75BN44YXK","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"SHCFFQS7","created_at":"2026-05-18T12:27:20Z"}],"graph_snapshots":[{"event_id":"sha256:377f3398cf910e952d3bb2d490ad252ddfe20dc7f5b8c264f6b38102080d6587","target":"graph","created_at":"2026-05-18T03:27:01Z","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 an approach to molecular-dynamics simulations of ferrofluids on graphics processing units (GPUs). Our numerical scheme is based on a GPU-oriented modification of the Barnes-Hut (BH) algorithm designed to increase the parallelism of computations. For an ensemble consisting of one million of ferromagnetic particles, the performance of the proposed algorithm on a Tesla M2050 GPU demonstrated a computational-time speed-up of four order of magnitude compared to the performance of the sequential All-Pairs (AP) algorithm on a single-core CPU, and two order of magnitude compared to the perf","authors_text":"A. Yu. Polyakov, P. Hanggi, S. Denisov, T. V. Lyutyy, V. V. Reva","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2012-12-12T19:14:00Z","title":"Large-scale Ferrofluid Simulations on Graphics Processing Units"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.2934","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:cc079ff79ed2b2f811d0539b09234983016352eb6216781d15b7a31f55c0315f","target":"record","created_at":"2026-05-18T03:27:01Z","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":"9a5b68f5136f5470fa02db1ca219039d1ffd3c7cf7b390f964eb896e034ffa67","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2012-12-12T19:14:00Z","title_canon_sha256":"c09bca1d15a4767353981a5d39f100e2aa271680a1ef8403343a4628407915fc"},"schema_version":"1.0","source":{"id":"1212.2934","kind":"arxiv","version":2}},"canonical_sha256":"91c452c25fe85bce62ea1a9cdaefe26acfb87e1b37d2829e03036a947136d7dc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"91c452c25fe85bce62ea1a9cdaefe26acfb87e1b37d2829e03036a947136d7dc","first_computed_at":"2026-05-18T03:27:01.258780Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:27:01.258780Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RlzGoKU4Y7BaePJBg/DkdpgnGVR2v5FvzrSrSm8P0TH8f4E4ZwJWqn0mt6H9gDQw7Nwh8PUBG6jMy9oycEG2BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:27:01.259175Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.2934","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc079ff79ed2b2f811d0539b09234983016352eb6216781d15b7a31f55c0315f","sha256:377f3398cf910e952d3bb2d490ad252ddfe20dc7f5b8c264f6b38102080d6587"],"state_sha256":"54d858fb5d94fe4c5ea3c44d72b944134f79667eb6654d5aa318aeadee451937"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uEsaShSiq+tvwSfhJkR4oc10P8HLsoPrjS0A7lzX903/7kSI+m1ihoKgK9PUrJKKmvTnIn3hwqsEOVhgx6NVDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T23:07:54.731404Z","bundle_sha256":"5a5b4f636af5f17279bccaeec6d916a94db04372b0105e95cb48dc958a283ac5"}}