{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:BRHU4WI7C3TEINXIXHLIJ77RIX","short_pith_number":"pith:BRHU4WI7","canonical_record":{"source":{"id":"1212.2174","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2012-12-10T19:29:17Z","cross_cats_sorted":[],"title_canon_sha256":"a82437d25ae5dab28fb56415a5a0a761b5ce8bcfa0a8c02db47fadeee720c123","abstract_canon_sha256":"2a7f18961c79c8d3d74b99aca01fe7e5481a224391552920ce0b3bedcb19402d"},"schema_version":"1.0"},"canonical_sha256":"0c4f4e591f16e64436e8b9d684fff145f67522ac4a8540a7bc90b80aa3e80798","source":{"kind":"arxiv","id":"1212.2174","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.2174","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"arxiv_version","alias_value":"1212.2174v1","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.2174","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"pith_short_12","alias_value":"BRHU4WI7C3TE","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"BRHU4WI7C3TEINXI","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"BRHU4WI7","created_at":"2026-05-18T12:27:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:BRHU4WI7C3TEINXIXHLIJ77RIX","target":"record","payload":{"canonical_record":{"source":{"id":"1212.2174","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2012-12-10T19:29:17Z","cross_cats_sorted":[],"title_canon_sha256":"a82437d25ae5dab28fb56415a5a0a761b5ce8bcfa0a8c02db47fadeee720c123","abstract_canon_sha256":"2a7f18961c79c8d3d74b99aca01fe7e5481a224391552920ce0b3bedcb19402d"},"schema_version":"1.0"},"canonical_sha256":"0c4f4e591f16e64436e8b9d684fff145f67522ac4a8540a7bc90b80aa3e80798","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:17.071981Z","signature_b64":"HQzhuVcCDFgEBXp3lvkCznBupqFmo/8uweaItLfQFOeOiEeT+enHF/lv/d66LNUSvO7XovVXb/mMVSYxA+leAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0c4f4e591f16e64436e8b9d684fff145f67522ac4a8540a7bc90b80aa3e80798","last_reissued_at":"2026-05-18T01:23:17.071341Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:17.071341Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1212.2174","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":"2026-05-18T01:23:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pc46fNQK1Zh0k+KA0k+pBSX/L/QWtmGJnSLKo6oTXIqBOX1q3Zfz8UtaMglkB6IVlw/+pmJrMFgk+kfpwgKyAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T12:29:24.651100Z"},"content_sha256":"fa90cdd09c58b5f097c61cbdc7641374d2e88774dcac1dd72684fc95e2d3e757","schema_version":"1.0","event_id":"sha256:fa90cdd09c58b5f097c61cbdc7641374d2e88774dcac1dd72684fc95e2d3e757"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:BRHU4WI7C3TEINXIXHLIJ77RIX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An empirical study on a learning path on wave physics focused on energy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"Simone Di Renzone, Vera Montalbano","submitted_at":"2012-12-10T19:29:17Z","abstract_excerpt":"We describe an extracurricular learning path on waves focused on energy transfer. The advantages of introducing mechanical waves by using the Shive wave machine and laboratory activities are presented. Laboratories are realized by inquiry, i.e. students explore waves behavior in qualitative way, guess what can happen and suddenly test their hypothesis. Recently, we presented some disciplinary knots that arise usually in empirical investigation, according to the Model of Educational Reconstruction and discussed methodological choices made in designing the learning path and preliminary result ab"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.2174","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":"2026-05-18T01:23:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MR35GlkNdkzZ10xiS94/VmGEmPc6Xibmfy5feXMocDO5z+6oBYF9KObxL5BCX7KPhucgAw8/hd2QFp+vknYHAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T12:29:24.651456Z"},"content_sha256":"6a7e2a126272f23a387515de32d860165adb250951a7d3cac1245ad05db70701","schema_version":"1.0","event_id":"sha256:6a7e2a126272f23a387515de32d860165adb250951a7d3cac1245ad05db70701"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/bundle.json","state_url":"https://pith.science/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/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":"2026-06-25T12:29:24Z","links":{"resolver":"https://pith.science/pith/BRHU4WI7C3TEINXIXHLIJ77RIX","bundle":"https://pith.science/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/bundle.json","state":"https://pith.science/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BRHU4WI7C3TEINXIXHLIJ77RIX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:BRHU4WI7C3TEINXIXHLIJ77RIX","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":"2a7f18961c79c8d3d74b99aca01fe7e5481a224391552920ce0b3bedcb19402d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2012-12-10T19:29:17Z","title_canon_sha256":"a82437d25ae5dab28fb56415a5a0a761b5ce8bcfa0a8c02db47fadeee720c123"},"schema_version":"1.0","source":{"id":"1212.2174","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.2174","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"arxiv_version","alias_value":"1212.2174v1","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.2174","created_at":"2026-05-18T01:23:17Z"},{"alias_kind":"pith_short_12","alias_value":"BRHU4WI7C3TE","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"BRHU4WI7C3TEINXI","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"BRHU4WI7","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:6a7e2a126272f23a387515de32d860165adb250951a7d3cac1245ad05db70701","target":"graph","created_at":"2026-05-18T01:23:17Z","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 describe an extracurricular learning path on waves focused on energy transfer. The advantages of introducing mechanical waves by using the Shive wave machine and laboratory activities are presented. Laboratories are realized by inquiry, i.e. students explore waves behavior in qualitative way, guess what can happen and suddenly test their hypothesis. Recently, we presented some disciplinary knots that arise usually in empirical investigation, according to the Model of Educational Reconstruction and discussed methodological choices made in designing the learning path and preliminary result ab","authors_text":"Simone Di Renzone, Vera Montalbano","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2012-12-10T19:29:17Z","title":"An empirical study on a learning path on wave physics focused on energy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.2174","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:fa90cdd09c58b5f097c61cbdc7641374d2e88774dcac1dd72684fc95e2d3e757","target":"record","created_at":"2026-05-18T01:23:17Z","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":"2a7f18961c79c8d3d74b99aca01fe7e5481a224391552920ce0b3bedcb19402d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2012-12-10T19:29:17Z","title_canon_sha256":"a82437d25ae5dab28fb56415a5a0a761b5ce8bcfa0a8c02db47fadeee720c123"},"schema_version":"1.0","source":{"id":"1212.2174","kind":"arxiv","version":1}},"canonical_sha256":"0c4f4e591f16e64436e8b9d684fff145f67522ac4a8540a7bc90b80aa3e80798","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c4f4e591f16e64436e8b9d684fff145f67522ac4a8540a7bc90b80aa3e80798","first_computed_at":"2026-05-18T01:23:17.071341Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:17.071341Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HQzhuVcCDFgEBXp3lvkCznBupqFmo/8uweaItLfQFOeOiEeT+enHF/lv/d66LNUSvO7XovVXb/mMVSYxA+leAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:17.071981Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.2174","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa90cdd09c58b5f097c61cbdc7641374d2e88774dcac1dd72684fc95e2d3e757","sha256:6a7e2a126272f23a387515de32d860165adb250951a7d3cac1245ad05db70701"],"state_sha256":"72d3949875ff87e9d08953b2def7ab37d3d0b3dc1b27a10c5bcfc3a382d13c87"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"itI94LObZ8PyVzVgf3H0c2FfdJCtgnBYhNGa/1e1EVIX61m1V0e0FalN0GkZyp1u3keo0e6C13DZjAlQJEZSDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T12:29:24.653396Z","bundle_sha256":"1d72b054685db10bb96314497f48bef10c7b78ea677d3ca48700ef605509488b"}}