{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:LS7FF6U34KMFOERYTPF5L55BAD","short_pith_number":"pith:LS7FF6U3","canonical_record":{"source":{"id":"0907.3279","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2009-07-19T10:27:49Z","cross_cats_sorted":[],"title_canon_sha256":"069e83b252069ea9627e95acefd275a6517e188fc101d42c3246f0b609536fcf","abstract_canon_sha256":"ba0298be9f9b3d37d32846253980caf74c3988354df548b642e2262e413110ae"},"schema_version":"1.0"},"canonical_sha256":"5cbe52fa9be2985712389bcbd5f7a100fa200910c8b0f50e6096021beab5ea3b","source":{"kind":"arxiv","id":"0907.3279","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3279","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3279v1","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3279","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"pith_short_12","alias_value":"LS7FF6U34KMF","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"LS7FF6U34KMFOERY","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"LS7FF6U3","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:LS7FF6U34KMFOERYTPF5L55BAD","target":"record","payload":{"canonical_record":{"source":{"id":"0907.3279","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2009-07-19T10:27:49Z","cross_cats_sorted":[],"title_canon_sha256":"069e83b252069ea9627e95acefd275a6517e188fc101d42c3246f0b609536fcf","abstract_canon_sha256":"ba0298be9f9b3d37d32846253980caf74c3988354df548b642e2262e413110ae"},"schema_version":"1.0"},"canonical_sha256":"5cbe52fa9be2985712389bcbd5f7a100fa200910c8b0f50e6096021beab5ea3b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:55.763694Z","signature_b64":"qFVTYDYvu1P58/VZCO2vqc7IlyXkvr/LITepqDbiU2kg1tHLubilPV+oWyn7sHW4/HLeXtSBbpTmNdt0A6JtDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5cbe52fa9be2985712389bcbd5f7a100fa200910c8b0f50e6096021beab5ea3b","last_reissued_at":"2026-05-18T02:12:55.763140Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:55.763140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.3279","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":"2026-05-18T02:12:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DpA80okHwSzB7ipi+BdHDcTIMEzGr8KX5C1Mcg8MmOTPhEGKgmkqQwRT5+tI0KheJ8nVg3ZWQuS/KVjszfSHBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T04:43:03.724810Z"},"content_sha256":"6bf8998717134f00456bd38634b39beff92e41f07764a8f93b6ef6060dc34c49","schema_version":"1.0","event_id":"sha256:6bf8998717134f00456bd38634b39beff92e41f07764a8f93b6ef6060dc34c49"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:LS7FF6U34KMFOERYTPF5L55BAD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Studying Three Phase Supply in School","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"Amit Kumar Singhal, P.Arun","submitted_at":"2009-07-19T10:27:49Z","abstract_excerpt":"The power distribution of nearly all major countries have accepted 3-phase distribution as a standard. With increasing power requirements of instrumentation today even a small physics laboratory requires 3-phase supply. While physics students are given an introduction of this in passing, no experiment work is done with 3-phase supply due to the sheer possibility of accidents while working with such large powers. We believe a conceptual understanding of 3-phase supply would be useful for physics students with hands on experience using a simple circuit that can be assembled even in a high school"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3279","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":"2026-05-18T02:12:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ogauyvcqse4i1KJufEgrrPHaasFt838MEF8ERn8AUOFGKODkuHpRhATw/aHbjo5MUzNtHWsnIM4oTJBo+48QBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T04:43:03.725143Z"},"content_sha256":"77cdeb8db6488429d70577360205dc157b6880ee685b8f9bd2e2e766b9ff89ef","schema_version":"1.0","event_id":"sha256:77cdeb8db6488429d70577360205dc157b6880ee685b8f9bd2e2e766b9ff89ef"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LS7FF6U34KMFOERYTPF5L55BAD/bundle.json","state_url":"https://pith.science/pith/LS7FF6U34KMFOERYTPF5L55BAD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LS7FF6U34KMFOERYTPF5L55BAD/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":"2026-06-27T04:43:03Z","links":{"resolver":"https://pith.science/pith/LS7FF6U34KMFOERYTPF5L55BAD","bundle":"https://pith.science/pith/LS7FF6U34KMFOERYTPF5L55BAD/bundle.json","state":"https://pith.science/pith/LS7FF6U34KMFOERYTPF5L55BAD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LS7FF6U34KMFOERYTPF5L55BAD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:LS7FF6U34KMFOERYTPF5L55BAD","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":"ba0298be9f9b3d37d32846253980caf74c3988354df548b642e2262e413110ae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2009-07-19T10:27:49Z","title_canon_sha256":"069e83b252069ea9627e95acefd275a6517e188fc101d42c3246f0b609536fcf"},"schema_version":"1.0","source":{"id":"0907.3279","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.3279","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"arxiv_version","alias_value":"0907.3279v1","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.3279","created_at":"2026-05-18T02:12:55Z"},{"alias_kind":"pith_short_12","alias_value":"LS7FF6U34KMF","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"LS7FF6U34KMFOERY","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"LS7FF6U3","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:77cdeb8db6488429d70577360205dc157b6880ee685b8f9bd2e2e766b9ff89ef","target":"graph","created_at":"2026-05-18T02:12:55Z","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":"The power distribution of nearly all major countries have accepted 3-phase distribution as a standard. With increasing power requirements of instrumentation today even a small physics laboratory requires 3-phase supply. While physics students are given an introduction of this in passing, no experiment work is done with 3-phase supply due to the sheer possibility of accidents while working with such large powers. We believe a conceptual understanding of 3-phase supply would be useful for physics students with hands on experience using a simple circuit that can be assembled even in a high school","authors_text":"Amit Kumar Singhal, P.Arun","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2009-07-19T10:27:49Z","title":"Studying Three Phase Supply in School"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.3279","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":"sha256:6bf8998717134f00456bd38634b39beff92e41f07764a8f93b6ef6060dc34c49","target":"record","created_at":"2026-05-18T02:12:55Z","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":"ba0298be9f9b3d37d32846253980caf74c3988354df548b642e2262e413110ae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2009-07-19T10:27:49Z","title_canon_sha256":"069e83b252069ea9627e95acefd275a6517e188fc101d42c3246f0b609536fcf"},"schema_version":"1.0","source":{"id":"0907.3279","kind":"arxiv","version":1}},"canonical_sha256":"5cbe52fa9be2985712389bcbd5f7a100fa200910c8b0f50e6096021beab5ea3b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5cbe52fa9be2985712389bcbd5f7a100fa200910c8b0f50e6096021beab5ea3b","first_computed_at":"2026-05-18T02:12:55.763140Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:55.763140Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qFVTYDYvu1P58/VZCO2vqc7IlyXkvr/LITepqDbiU2kg1tHLubilPV+oWyn7sHW4/HLeXtSBbpTmNdt0A6JtDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:55.763694Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.3279","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6bf8998717134f00456bd38634b39beff92e41f07764a8f93b6ef6060dc34c49","sha256:77cdeb8db6488429d70577360205dc157b6880ee685b8f9bd2e2e766b9ff89ef"],"state_sha256":"dd6073dc339c30770b3a332a7849e33aa88c64d0bd8d740c5650dacf18c59225"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ssJmOUWs3YICU+QWkzzGXlUCDUOmn/kidagDOR3neBTW3BGZ92qPY+4//2vpRNVIjvdPKrQ8VjMjGUAWy1mBDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T04:43:03.726918Z","bundle_sha256":"c72a7f4ee7e1a0216fa609592d6797dfb16696178ea93c4fd2b7ce1005979f02"}}