{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:OKNKTJ4AMDI5RRY67M5IVIUVGN","short_pith_number":"pith:OKNKTJ4A","canonical_record":{"source":{"id":"1601.05841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-01-21T23:19:24Z","cross_cats_sorted":[],"title_canon_sha256":"5b72e02bd19f459a7a2868c28fbb311482cfad8c7e752fb4c092275ba73a4b62","abstract_canon_sha256":"3cfa4d7af345aa88c7a938d9fce090d043086c4b2fc8a4b95410713a0a694aef"},"schema_version":"1.0"},"canonical_sha256":"729aa9a78060d1d8c71efb3a8aa2953361602feffe73a6542792345ab53a3039","source":{"kind":"arxiv","id":"1601.05841","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.05841","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"1601.05841v1","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.05841","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"OKNKTJ4AMDI5","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OKNKTJ4AMDI5RRY6","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OKNKTJ4A","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:OKNKTJ4AMDI5RRY67M5IVIUVGN","target":"record","payload":{"canonical_record":{"source":{"id":"1601.05841","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-01-21T23:19:24Z","cross_cats_sorted":[],"title_canon_sha256":"5b72e02bd19f459a7a2868c28fbb311482cfad8c7e752fb4c092275ba73a4b62","abstract_canon_sha256":"3cfa4d7af345aa88c7a938d9fce090d043086c4b2fc8a4b95410713a0a694aef"},"schema_version":"1.0"},"canonical_sha256":"729aa9a78060d1d8c71efb3a8aa2953361602feffe73a6542792345ab53a3039","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:21.046214Z","signature_b64":"Xd6WqBdzXupFXhyxhb7fzlJLTk1WjJ9ArRQnPRZOO841wcJxTXqUHNm/ixyqoSUeMpPYuxLbBCe/M8LOg12IAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"729aa9a78060d1d8c71efb3a8aa2953361602feffe73a6542792345ab53a3039","last_reissued_at":"2026-05-18T01:21:21.045705Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:21.045705Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.05841","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":"2026-05-18T01:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kFK6ZrfBF+R8C8FRNMOnwvQ7aVi2b0UlQ7IrWCQBYFSHgAN9t3vMk2PXLtDwYsg1ShIr4j1ONR5o/oevZQbkDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T07:51:09.897755Z"},"content_sha256":"92e8e30a06ce7b42c1fc107710d719af3afe680e31f0daf298936313518efcef","schema_version":"1.0","event_id":"sha256:92e8e30a06ce7b42c1fc107710d719af3afe680e31f0daf298936313518efcef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:OKNKTJ4AMDI5RRY67M5IVIUVGN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Kinematic measurements using an infrared sensor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"F. Marinho, L. Paulucci","submitted_at":"2016-01-21T23:19:24Z","abstract_excerpt":"The use of an infrared sensor as a new alternative to measure position as a function of time in kinematic experiments was investigated using a microcontroller as data acquisition and control device. These are versatile sensors that offer advantages over the typical ultrasound devices. The setup described in this paper enables students to develop their own experiments promoting opportunities for learning physical concepts such as the different types of forces that can act on a body (gravitational, elastic, drag, etc.) and the resulting types of movements with good sensitivity within the $\\rm 4-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.05841","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":"2026-05-18T01:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Jjc99E0yTwCT4sjFW2sz/vYl9J6FFUThjuodVfIvx3MBMIxH1NQgq6sb0WU7kz+3ber/pcnuqfEtn3AjPaVhCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T07:51:09.898097Z"},"content_sha256":"63cf8d6a83bb78e1b9dceaa5151405bd0e0ee49c00be247bedc196c36f082445","schema_version":"1.0","event_id":"sha256:63cf8d6a83bb78e1b9dceaa5151405bd0e0ee49c00be247bedc196c36f082445"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/bundle.json","state_url":"https://pith.science/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/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":"2026-05-28T07:51:09Z","links":{"resolver":"https://pith.science/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN","bundle":"https://pith.science/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/bundle.json","state":"https://pith.science/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OKNKTJ4AMDI5RRY67M5IVIUVGN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OKNKTJ4AMDI5RRY67M5IVIUVGN","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":"3cfa4d7af345aa88c7a938d9fce090d043086c4b2fc8a4b95410713a0a694aef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-01-21T23:19:24Z","title_canon_sha256":"5b72e02bd19f459a7a2868c28fbb311482cfad8c7e752fb4c092275ba73a4b62"},"schema_version":"1.0","source":{"id":"1601.05841","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.05841","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"1601.05841v1","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.05841","created_at":"2026-05-18T01:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"OKNKTJ4AMDI5","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OKNKTJ4AMDI5RRY6","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OKNKTJ4A","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:63cf8d6a83bb78e1b9dceaa5151405bd0e0ee49c00be247bedc196c36f082445","target":"graph","created_at":"2026-05-18T01:21:21Z","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 use of an infrared sensor as a new alternative to measure position as a function of time in kinematic experiments was investigated using a microcontroller as data acquisition and control device. These are versatile sensors that offer advantages over the typical ultrasound devices. The setup described in this paper enables students to develop their own experiments promoting opportunities for learning physical concepts such as the different types of forces that can act on a body (gravitational, elastic, drag, etc.) and the resulting types of movements with good sensitivity within the $\\rm 4-","authors_text":"F. Marinho, L. Paulucci","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-01-21T23:19:24Z","title":"Kinematic measurements using an infrared sensor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.05841","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":"sha256:92e8e30a06ce7b42c1fc107710d719af3afe680e31f0daf298936313518efcef","target":"record","created_at":"2026-05-18T01:21:21Z","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":"3cfa4d7af345aa88c7a938d9fce090d043086c4b2fc8a4b95410713a0a694aef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-01-21T23:19:24Z","title_canon_sha256":"5b72e02bd19f459a7a2868c28fbb311482cfad8c7e752fb4c092275ba73a4b62"},"schema_version":"1.0","source":{"id":"1601.05841","kind":"arxiv","version":1}},"canonical_sha256":"729aa9a78060d1d8c71efb3a8aa2953361602feffe73a6542792345ab53a3039","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"729aa9a78060d1d8c71efb3a8aa2953361602feffe73a6542792345ab53a3039","first_computed_at":"2026-05-18T01:21:21.045705Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:21.045705Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Xd6WqBdzXupFXhyxhb7fzlJLTk1WjJ9ArRQnPRZOO841wcJxTXqUHNm/ixyqoSUeMpPYuxLbBCe/M8LOg12IAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:21.046214Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.05841","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:92e8e30a06ce7b42c1fc107710d719af3afe680e31f0daf298936313518efcef","sha256:63cf8d6a83bb78e1b9dceaa5151405bd0e0ee49c00be247bedc196c36f082445"],"state_sha256":"4cb9f156ca9fe03a6763ee3fac84d8cf497903c4c5dbac74f283ef32f918814e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GBntRDwNMafnLb9tuDHYdFvCq3yMhwBEgmhvC5UdLakg73jiTQ3eOFlHivgMuhKrgVnLXklVL5Tx7xfeEYvbDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T07:51:09.900035Z","bundle_sha256":"bfcb41e4cdf00ff13b03d213f691d626604706a0266bcec6976b5e339da84d9e"}}