{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:LT4RBRA3I622LOEQU5Y53T6XBF","short_pith_number":"pith:LT4RBRA3","canonical_record":{"source":{"id":"1908.07661","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-21T00:54:48Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"3c13e6c2c12ae70198adb6c3c28ae20688182a61ab5b80140ff0ed40c8417f2c","abstract_canon_sha256":"f07a41599145c937ae748b9c4791896e15ae915d0f22d8f157b765d162b79410"},"schema_version":"1.0"},"canonical_sha256":"5cf910c41b47b5a5b890a771ddcfd7095fe63bb26aafe2f312ce365cdd6bea95","source":{"kind":"arxiv","id":"1908.07661","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07661","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07661v1","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07661","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_12","alias_value":"LT4RBRA3I622","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_16","alias_value":"LT4RBRA3I622LOEQ","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_8","alias_value":"LT4RBRA3","created_at":"2026-07-05T00:55:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:LT4RBRA3I622LOEQU5Y53T6XBF","target":"record","payload":{"canonical_record":{"source":{"id":"1908.07661","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-21T00:54:48Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"3c13e6c2c12ae70198adb6c3c28ae20688182a61ab5b80140ff0ed40c8417f2c","abstract_canon_sha256":"f07a41599145c937ae748b9c4791896e15ae915d0f22d8f157b765d162b79410"},"schema_version":"1.0"},"canonical_sha256":"5cf910c41b47b5a5b890a771ddcfd7095fe63bb26aafe2f312ce365cdd6bea95","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:55:58.575736Z","signature_b64":"mK6paHQzsA0pOTm6h6uulgYG/zgkNmluSCHl6mB/lULgIciH+GCw9/FwENqQ8ML1AMXA83J1KCaLN9/rjNtxAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5cf910c41b47b5a5b890a771ddcfd7095fe63bb26aafe2f312ce365cdd6bea95","last_reissued_at":"2026-07-05T00:55:58.575235Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:55:58.575235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.07661","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":"2026-07-05T00:55:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3M1QT5LuCYaDOQykMolrR/4P0IPSnXOOhmQUaX0vCqzU5D3a4FzPsAfBTppqbO1W+Tzb4pNdOIp4b/rtM+StCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T05:26:20.872533Z"},"content_sha256":"a8540bad992d1c60d5accca49e233a1174b6ebc3b753f21361b8a6cf684e315a","schema_version":"1.0","event_id":"sha256:a8540bad992d1c60d5accca49e233a1174b6ebc3b753f21361b8a6cf684e315a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:LT4RBRA3I622LOEQU5Y53T6XBF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Designing Anisotropic Microstructures with Spectral Density Function","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"physics.app-ph","authors_text":"Akshay Iyer, Ganesh Balasubramanian, Rabindra Dulal, TeYu Chien, Umar Farooq Ghumman, Wei Chen, Yichi Zhang","submitted_at":"2019-08-21T00:54:48Z","abstract_excerpt":"Materials' microstructure strongly influences its performance and is thus a critical aspect in design of functional materials. Previous efforts on microstructure mediated design mostly assume isotropy, which is not ideal when material performance is dependent on an underlying transport phenomenon. In this article, we propose an anisotropic microstructure design strategy that leverages Spectral Density Function (SDF) for rapid reconstruction of high resolution, two phase, isotropic or anisotropic microstructures in 2D and 3D. We demonstrate that SDF microstructure representation provides an int"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07661","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1908.07661/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:55:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Lq4kEs1hoqt1Z5IRDZeLkpiNp8wAY0yYIzO8EhacXlwLMeqfqn31c5ahydNCe73TovGe8mBiLCmP+QjmO5i1BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T05:26:20.873037Z"},"content_sha256":"99ca545c2775ded5500d13a2b5ab35e5f181261a3269be6501f21c83a8cbe1b6","schema_version":"1.0","event_id":"sha256:99ca545c2775ded5500d13a2b5ab35e5f181261a3269be6501f21c83a8cbe1b6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LT4RBRA3I622LOEQU5Y53T6XBF/bundle.json","state_url":"https://pith.science/pith/LT4RBRA3I622LOEQU5Y53T6XBF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LT4RBRA3I622LOEQU5Y53T6XBF/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":"2026-08-16T05:26:20Z","links":{"resolver":"https://pith.science/pith/LT4RBRA3I622LOEQU5Y53T6XBF","bundle":"https://pith.science/pith/LT4RBRA3I622LOEQU5Y53T6XBF/bundle.json","state":"https://pith.science/pith/LT4RBRA3I622LOEQU5Y53T6XBF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LT4RBRA3I622LOEQU5Y53T6XBF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:LT4RBRA3I622LOEQU5Y53T6XBF","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":"f07a41599145c937ae748b9c4791896e15ae915d0f22d8f157b765d162b79410","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-21T00:54:48Z","title_canon_sha256":"3c13e6c2c12ae70198adb6c3c28ae20688182a61ab5b80140ff0ed40c8417f2c"},"schema_version":"1.0","source":{"id":"1908.07661","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.07661","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"arxiv_version","alias_value":"1908.07661v1","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.07661","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_12","alias_value":"LT4RBRA3I622","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_16","alias_value":"LT4RBRA3I622LOEQ","created_at":"2026-07-05T00:55:58Z"},{"alias_kind":"pith_short_8","alias_value":"LT4RBRA3","created_at":"2026-07-05T00:55:58Z"}],"graph_snapshots":[{"event_id":"sha256:99ca545c2775ded5500d13a2b5ab35e5f181261a3269be6501f21c83a8cbe1b6","target":"graph","created_at":"2026-07-05T00:55:58Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1908.07661/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Materials' microstructure strongly influences its performance and is thus a critical aspect in design of functional materials. Previous efforts on microstructure mediated design mostly assume isotropy, which is not ideal when material performance is dependent on an underlying transport phenomenon. In this article, we propose an anisotropic microstructure design strategy that leverages Spectral Density Function (SDF) for rapid reconstruction of high resolution, two phase, isotropic or anisotropic microstructures in 2D and 3D. We demonstrate that SDF microstructure representation provides an int","authors_text":"Akshay Iyer, Ganesh Balasubramanian, Rabindra Dulal, TeYu Chien, Umar Farooq Ghumman, Wei Chen, Yichi Zhang","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-21T00:54:48Z","title":"Designing Anisotropic Microstructures with Spectral Density Function"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.07661","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:a8540bad992d1c60d5accca49e233a1174b6ebc3b753f21361b8a6cf684e315a","target":"record","created_at":"2026-07-05T00:55:58Z","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":"f07a41599145c937ae748b9c4791896e15ae915d0f22d8f157b765d162b79410","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-21T00:54:48Z","title_canon_sha256":"3c13e6c2c12ae70198adb6c3c28ae20688182a61ab5b80140ff0ed40c8417f2c"},"schema_version":"1.0","source":{"id":"1908.07661","kind":"arxiv","version":1}},"canonical_sha256":"5cf910c41b47b5a5b890a771ddcfd7095fe63bb26aafe2f312ce365cdd6bea95","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5cf910c41b47b5a5b890a771ddcfd7095fe63bb26aafe2f312ce365cdd6bea95","first_computed_at":"2026-07-05T00:55:58.575235Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:55:58.575235Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mK6paHQzsA0pOTm6h6uulgYG/zgkNmluSCHl6mB/lULgIciH+GCw9/FwENqQ8ML1AMXA83J1KCaLN9/rjNtxAA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:55:58.575736Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.07661","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8540bad992d1c60d5accca49e233a1174b6ebc3b753f21361b8a6cf684e315a","sha256:99ca545c2775ded5500d13a2b5ab35e5f181261a3269be6501f21c83a8cbe1b6"],"state_sha256":"610a84ce548005e57f8ac06283f95175d1c164b3e5de58c693448211d2521282"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B5AhRRGwh5E2FeHs1hLhqf0azStEDJPmKwgrQqwNiuPlIdqwF51jzsZXY7wB4b7AenfccehEm6zzayDa19LrBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T05:26:20.877293Z","bundle_sha256":"dcc28ddd45a5130faaf32ddcaf02a756a44106bac6c24a7988ca78b53f08b500"}}