{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ZXCH7C25R3O3ZTXG7IM7YC7AQO","short_pith_number":"pith:ZXCH7C25","canonical_record":{"source":{"id":"1501.01535","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2015-01-07T15:57:21Z","cross_cats_sorted":[],"title_canon_sha256":"90062c93985af5a248d7c52f72654178db1ecb5683fdf9e1a776369001caa8b1","abstract_canon_sha256":"610e0be5a958ab74adcfc068ffd2374a5f70651e29d08d1462b13ce479f7d2b4"},"schema_version":"1.0"},"canonical_sha256":"cdc47f8b5d8eddbccee6fa19fc0be08392f7c70d34f7f13e7641c78850db762b","source":{"kind":"arxiv","id":"1501.01535","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.01535","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"arxiv_version","alias_value":"1501.01535v4","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01535","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"pith_short_12","alias_value":"ZXCH7C25R3O3","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZXCH7C25R3O3ZTXG","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZXCH7C25","created_at":"2026-05-18T12:29:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ZXCH7C25R3O3ZTXG7IM7YC7AQO","target":"record","payload":{"canonical_record":{"source":{"id":"1501.01535","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2015-01-07T15:57:21Z","cross_cats_sorted":[],"title_canon_sha256":"90062c93985af5a248d7c52f72654178db1ecb5683fdf9e1a776369001caa8b1","abstract_canon_sha256":"610e0be5a958ab74adcfc068ffd2374a5f70651e29d08d1462b13ce479f7d2b4"},"schema_version":"1.0"},"canonical_sha256":"cdc47f8b5d8eddbccee6fa19fc0be08392f7c70d34f7f13e7641c78850db762b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:45.217355Z","signature_b64":"eFwFAgyiQ//0BPn4l5RUkNPEtn5RVd0W66tZaIV3gIptbcdg87V6uJz5v5ow2pKOdBdcR9F6KXzDS0DpsaW1BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cdc47f8b5d8eddbccee6fa19fc0be08392f7c70d34f7f13e7641c78850db762b","last_reissued_at":"2026-05-18T01:23:45.216727Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:45.216727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.01535","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:23:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PLIn0p518RXYhqOfqNs04aMOVnEfKtN0iStgekibACB3VUygm5X3Jf8WPvcmu+FEmRXbpbOIBC+dF3XB7wYNCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T00:24:38.794329Z"},"content_sha256":"94f699f61c7faf1fd6f7fa375e490e25bfa40672df3dcab66c7a94061405c2c8","schema_version":"1.0","event_id":"sha256:94f699f61c7faf1fd6f7fa375e490e25bfa40672df3dcab66c7a94061405c2c8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ZXCH7C25R3O3ZTXG7IM7YC7AQO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding resonance graphs using Easy Java Simulations (EJS) and why we use EJS","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"Charles Chew, Darren Wong, Loo Kang Wee, Samuel Tan, Tat Leong Lee","submitted_at":"2015-01-07T15:57:21Z","abstract_excerpt":"This paper reports a computer model- simulation created using Easy Java Simulation (EJS) for learners to visualize how the steady-state amplitude of a driven oscillating system varies with the frequency of the periodic driving force. The simulation shows (N=100) identical spring-mass systems being subjected to (1) periodic driving force of equal amplitude but different driving frequencies and (2) different amount of damping. The simulation aims to create a visually intuitive way of understanding how the series of amplitude versus driving frequency graphs are obtained by showing how the displac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01535","kind":"arxiv","version":4},"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":"2026-05-18T01:23:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OQwYjbeKz7yqQMtOM4TnvrL355QC2h0wzh1hZWO11dsfkdQOz8warN/YKlETzr36diPMo6HPuPOWTmWMX6jwAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T00:24:38.795081Z"},"content_sha256":"cc5b858d21515b11d1b93856a9a4cf246312108e5ea21c255590b500880dfbfd","schema_version":"1.0","event_id":"sha256:cc5b858d21515b11d1b93856a9a4cf246312108e5ea21c255590b500880dfbfd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/bundle.json","state_url":"https://pith.science/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/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":"2026-06-08T00:24:38Z","links":{"resolver":"https://pith.science/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO","bundle":"https://pith.science/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/bundle.json","state":"https://pith.science/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZXCH7C25R3O3ZTXG7IM7YC7AQO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ZXCH7C25R3O3ZTXG7IM7YC7AQO","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":"610e0be5a958ab74adcfc068ffd2374a5f70651e29d08d1462b13ce479f7d2b4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2015-01-07T15:57:21Z","title_canon_sha256":"90062c93985af5a248d7c52f72654178db1ecb5683fdf9e1a776369001caa8b1"},"schema_version":"1.0","source":{"id":"1501.01535","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.01535","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"arxiv_version","alias_value":"1501.01535v4","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.01535","created_at":"2026-05-18T01:23:45Z"},{"alias_kind":"pith_short_12","alias_value":"ZXCH7C25R3O3","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"ZXCH7C25R3O3ZTXG","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"ZXCH7C25","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:cc5b858d21515b11d1b93856a9a4cf246312108e5ea21c255590b500880dfbfd","target":"graph","created_at":"2026-05-18T01:23:45Z","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":"This paper reports a computer model- simulation created using Easy Java Simulation (EJS) for learners to visualize how the steady-state amplitude of a driven oscillating system varies with the frequency of the periodic driving force. The simulation shows (N=100) identical spring-mass systems being subjected to (1) periodic driving force of equal amplitude but different driving frequencies and (2) different amount of damping. The simulation aims to create a visually intuitive way of understanding how the series of amplitude versus driving frequency graphs are obtained by showing how the displac","authors_text":"Charles Chew, Darren Wong, Loo Kang Wee, Samuel Tan, Tat Leong Lee","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2015-01-07T15:57:21Z","title":"Understanding resonance graphs using Easy Java Simulations (EJS) and why we use EJS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.01535","kind":"arxiv","version":4},"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":"sha256:94f699f61c7faf1fd6f7fa375e490e25bfa40672df3dcab66c7a94061405c2c8","target":"record","created_at":"2026-05-18T01:23:45Z","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":"610e0be5a958ab74adcfc068ffd2374a5f70651e29d08d1462b13ce479f7d2b4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.ed-ph","submitted_at":"2015-01-07T15:57:21Z","title_canon_sha256":"90062c93985af5a248d7c52f72654178db1ecb5683fdf9e1a776369001caa8b1"},"schema_version":"1.0","source":{"id":"1501.01535","kind":"arxiv","version":4}},"canonical_sha256":"cdc47f8b5d8eddbccee6fa19fc0be08392f7c70d34f7f13e7641c78850db762b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cdc47f8b5d8eddbccee6fa19fc0be08392f7c70d34f7f13e7641c78850db762b","first_computed_at":"2026-05-18T01:23:45.216727Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:45.216727Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eFwFAgyiQ//0BPn4l5RUkNPEtn5RVd0W66tZaIV3gIptbcdg87V6uJz5v5ow2pKOdBdcR9F6KXzDS0DpsaW1BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:45.217355Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.01535","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:94f699f61c7faf1fd6f7fa375e490e25bfa40672df3dcab66c7a94061405c2c8","sha256:cc5b858d21515b11d1b93856a9a4cf246312108e5ea21c255590b500880dfbfd"],"state_sha256":"70bd1d14aa97d016963de8c64d723e189cc3f1ca5367bb6b9eab90e7397b6445"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ydr7USgzRpN5gOk5cTwBoDLhS3aTHfP43hjKCoEDuBrC2DbJygxkvuqQU41auyJmlJa+UDFwbzWqNnYyGgMnAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T00:24:38.799063Z","bundle_sha256":"a5a4771f2f31310c209725804408e24aad56a6d815e1ede45492d1e62635fccf"}}