{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:EKLNRGFCYKZP5UVSXZUTDK5PJW","short_pith_number":"pith:EKLNRGFC","canonical_record":{"source":{"id":"1105.4644","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-05-23T22:09:42Z","cross_cats_sorted":[],"title_canon_sha256":"a9f3c1d2d8f72b127b6174df887226f85c208df8af6bba305ae9f866e15ab5d3","abstract_canon_sha256":"672258b247b80ddcfb36cf66b953bbf1a92ac79cef6f5fd8e2f7308c8e0a6236"},"schema_version":"1.0"},"canonical_sha256":"2296d898a2c2b2fed2b2be6931abaf4d9f2b047a301e29b9cf3b48066c996a14","source":{"kind":"arxiv","id":"1105.4644","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.4644","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"1105.4644v1","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.4644","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"EKLNRGFCYKZP","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"EKLNRGFCYKZP5UVS","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"EKLNRGFC","created_at":"2026-05-18T12:26:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:EKLNRGFCYKZP5UVSXZUTDK5PJW","target":"record","payload":{"canonical_record":{"source":{"id":"1105.4644","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-05-23T22:09:42Z","cross_cats_sorted":[],"title_canon_sha256":"a9f3c1d2d8f72b127b6174df887226f85c208df8af6bba305ae9f866e15ab5d3","abstract_canon_sha256":"672258b247b80ddcfb36cf66b953bbf1a92ac79cef6f5fd8e2f7308c8e0a6236"},"schema_version":"1.0"},"canonical_sha256":"2296d898a2c2b2fed2b2be6931abaf4d9f2b047a301e29b9cf3b48066c996a14","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:21:21.988521Z","signature_b64":"UC1/nwesCGS67LB15EzZjyhgu+8lmYqEdafS/C1c8GGj3E1bj5hNGxno1fpXNfXO11vLpVZB+WbYaGXBYHIaCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2296d898a2c2b2fed2b2be6931abaf4d9f2b047a301e29b9cf3b48066c996a14","last_reissued_at":"2026-05-18T04:21:21.987754Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:21:21.987754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1105.4644","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":"2026-05-18T04:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qu84bw78U9ACFeuOiA5Vf/QX4iAsepxNVABcPFtwuVOgFGKo7YILKAr1GSM6gxeBLownfVHs4OEO/GDVBf2PDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:53:33.314147Z"},"content_sha256":"93a5c622013bc3004753bdfe396cb4f2c208177f5092b01d07738848cde227ba","schema_version":"1.0","event_id":"sha256:93a5c622013bc3004753bdfe396cb4f2c208177f5092b01d07738848cde227ba"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:EKLNRGFCYKZP5UVSXZUTDK5PJW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analysis of Kelvin Probe Operational Models","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Eugeniu M. Popescu","submitted_at":"2011-05-23T22:09:42Z","abstract_excerpt":"We present a study of several models on which Kelvin Probe instruments with flat and spherical tips rely for operation and for the determination of the contact potential difference. Using covariance analysis, we have investigated the precision limits of each model as imposed by the Cramer-Rao bound. Where the situation demanded, we have evaluated the bias introduced by the method in the estimation of the contact potential difference."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.4644","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":"2026-05-18T04:21:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aZ0a8Q7mtPj7LO7mRhV/MHd/0U49ISGqtfcdIRgo3SMUMceVR6/2RvYYAouDWrEdAf3Q4PxRDgZxEDKEUtTADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:53:33.314670Z"},"content_sha256":"b8e509a40443e5f6785cb2fdbc2a3a3899ddaf7c9073ddeb5d4786a891268228","schema_version":"1.0","event_id":"sha256:b8e509a40443e5f6785cb2fdbc2a3a3899ddaf7c9073ddeb5d4786a891268228"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/bundle.json","state_url":"https://pith.science/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/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":"2026-05-30T08:53:33Z","links":{"resolver":"https://pith.science/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW","bundle":"https://pith.science/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/bundle.json","state":"https://pith.science/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EKLNRGFCYKZP5UVSXZUTDK5PJW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:EKLNRGFCYKZP5UVSXZUTDK5PJW","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":"672258b247b80ddcfb36cf66b953bbf1a92ac79cef6f5fd8e2f7308c8e0a6236","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-05-23T22:09:42Z","title_canon_sha256":"a9f3c1d2d8f72b127b6174df887226f85c208df8af6bba305ae9f866e15ab5d3"},"schema_version":"1.0","source":{"id":"1105.4644","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.4644","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"arxiv_version","alias_value":"1105.4644v1","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.4644","created_at":"2026-05-18T04:21:21Z"},{"alias_kind":"pith_short_12","alias_value":"EKLNRGFCYKZP","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"EKLNRGFCYKZP5UVS","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"EKLNRGFC","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:b8e509a40443e5f6785cb2fdbc2a3a3899ddaf7c9073ddeb5d4786a891268228","target":"graph","created_at":"2026-05-18T04:21:21Z","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":"We present a study of several models on which Kelvin Probe instruments with flat and spherical tips rely for operation and for the determination of the contact potential difference. Using covariance analysis, we have investigated the precision limits of each model as imposed by the Cramer-Rao bound. Where the situation demanded, we have evaluated the bias introduced by the method in the estimation of the contact potential difference.","authors_text":"Eugeniu M. Popescu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-05-23T22:09:42Z","title":"Analysis of Kelvin Probe Operational Models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.4644","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":"sha256:93a5c622013bc3004753bdfe396cb4f2c208177f5092b01d07738848cde227ba","target":"record","created_at":"2026-05-18T04:21:21Z","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":"672258b247b80ddcfb36cf66b953bbf1a92ac79cef6f5fd8e2f7308c8e0a6236","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2011-05-23T22:09:42Z","title_canon_sha256":"a9f3c1d2d8f72b127b6174df887226f85c208df8af6bba305ae9f866e15ab5d3"},"schema_version":"1.0","source":{"id":"1105.4644","kind":"arxiv","version":1}},"canonical_sha256":"2296d898a2c2b2fed2b2be6931abaf4d9f2b047a301e29b9cf3b48066c996a14","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2296d898a2c2b2fed2b2be6931abaf4d9f2b047a301e29b9cf3b48066c996a14","first_computed_at":"2026-05-18T04:21:21.987754Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:21:21.987754Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UC1/nwesCGS67LB15EzZjyhgu+8lmYqEdafS/C1c8GGj3E1bj5hNGxno1fpXNfXO11vLpVZB+WbYaGXBYHIaCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:21:21.988521Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.4644","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93a5c622013bc3004753bdfe396cb4f2c208177f5092b01d07738848cde227ba","sha256:b8e509a40443e5f6785cb2fdbc2a3a3899ddaf7c9073ddeb5d4786a891268228"],"state_sha256":"ddd5ab330358c4c5cd308401827d1ab89091c359651275307f7e80aeb4cc5569"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vGjV4571l2O47ezgg7jaa65Lx2PR7f4Px6s6p4kTowWwLpC6eaUL+i7Bj9AGWAUaDznoDai42KwsofeL98ObCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:53:33.317129Z","bundle_sha256":"207bd171869783487034dd91d94ee54a64f9de414c87ce764652f8d07fb865b2"}}