{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:IOIKD5ZSYDNIPKGUR6FQYHJ4YJ","short_pith_number":"pith:IOIKD5ZS","canonical_record":{"source":{"id":"1605.06089","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-19T19:25:53Z","cross_cats_sorted":[],"title_canon_sha256":"510ca3909386da1a25a690a804a6eab757bc2147ffaedddee6dc2a354548ac0d","abstract_canon_sha256":"8cdcbc6bf1454d47ffefad6b05c9ceccfabf964526dc204c617ee09a2b6eb3e3"},"schema_version":"1.0"},"canonical_sha256":"4390a1f732c0da87a8d48f8b0c1d3cc25df6e123107a9b9c449886215dc75cfc","source":{"kind":"arxiv","id":"1605.06089","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.06089","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"arxiv_version","alias_value":"1605.06089v1","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.06089","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"pith_short_12","alias_value":"IOIKD5ZSYDNI","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IOIKD5ZSYDNIPKGU","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IOIKD5ZS","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:IOIKD5ZSYDNIPKGUR6FQYHJ4YJ","target":"record","payload":{"canonical_record":{"source":{"id":"1605.06089","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-19T19:25:53Z","cross_cats_sorted":[],"title_canon_sha256":"510ca3909386da1a25a690a804a6eab757bc2147ffaedddee6dc2a354548ac0d","abstract_canon_sha256":"8cdcbc6bf1454d47ffefad6b05c9ceccfabf964526dc204c617ee09a2b6eb3e3"},"schema_version":"1.0"},"canonical_sha256":"4390a1f732c0da87a8d48f8b0c1d3cc25df6e123107a9b9c449886215dc75cfc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:32.750964Z","signature_b64":"1k9fn2D/M0zN8SbT0dR1h79CkK4XY9asWFieesvEjR3B+MC7JibvoCsF45yvH8qv6tSuTd+5dYNYDoMhAaHGAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4390a1f732c0da87a8d48f8b0c1d3cc25df6e123107a9b9c449886215dc75cfc","last_reissued_at":"2026-05-18T01:04:32.750240Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:32.750240Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.06089","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":"2026-05-18T01:04:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IZAE/i4g/lmC+U2WT9XvRk8fXDAj2JgahqDYEpsgmH8dmLvq5IrA/PtmjfudlaJ4b3sgaQHk6brspZDASdUhCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T11:59:45.250413Z"},"content_sha256":"43b4f17efff77bd1840d4bf600a09c6b5b18058125486d5c3062fc281ae794ed","schema_version":"1.0","event_id":"sha256:43b4f17efff77bd1840d4bf600a09c6b5b18058125486d5c3062fc281ae794ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:IOIKD5ZSYDNIPKGUR6FQYHJ4YJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The acoustic force density acting on inhomogeneous fluids in acoustic fields","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Henrik Bruus, Jonas T. Karlsen, Per Augustsson","submitted_at":"2016-05-19T19:25:53Z","abstract_excerpt":"We present a theory for the acoustic force density acting on inhomogeneous fluids in acoustic fields on time scales that are slow compared to the acoustic oscillation period. The acoustic force density depends on gradients in the density and compressibility of the fluid. For microfluidic systems, the theory predicts a relocation of the inhomogeneities into stable field-dependent configurations, which are qualitatively different from the horizontally layered configurations due to gravity. Experimental validation is obtained by confocal imaging of aqueous solutions in a glass-silicon microchip."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.06089","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":"2026-05-18T01:04:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nP3g/NanE7Aiaf/u6HrhRA0grONsQcQHhxJyZ8ISIhim2D5yHPFiPcl5zCnD+KqhHk+je1XwZNwl6Rb1eSiCDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T11:59:45.251140Z"},"content_sha256":"67a8f6c81ce61522ad8c34b0d48a89ebf9367859e373fc14addb377da312a84d","schema_version":"1.0","event_id":"sha256:67a8f6c81ce61522ad8c34b0d48a89ebf9367859e373fc14addb377da312a84d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/bundle.json","state_url":"https://pith.science/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/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":"2026-06-10T11:59:45Z","links":{"resolver":"https://pith.science/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ","bundle":"https://pith.science/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/bundle.json","state":"https://pith.science/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IOIKD5ZSYDNIPKGUR6FQYHJ4YJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:IOIKD5ZSYDNIPKGUR6FQYHJ4YJ","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":"8cdcbc6bf1454d47ffefad6b05c9ceccfabf964526dc204c617ee09a2b6eb3e3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-19T19:25:53Z","title_canon_sha256":"510ca3909386da1a25a690a804a6eab757bc2147ffaedddee6dc2a354548ac0d"},"schema_version":"1.0","source":{"id":"1605.06089","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.06089","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"arxiv_version","alias_value":"1605.06089v1","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.06089","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"pith_short_12","alias_value":"IOIKD5ZSYDNI","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IOIKD5ZSYDNIPKGU","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IOIKD5ZS","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:67a8f6c81ce61522ad8c34b0d48a89ebf9367859e373fc14addb377da312a84d","target":"graph","created_at":"2026-05-18T01:04:32Z","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 theory for the acoustic force density acting on inhomogeneous fluids in acoustic fields on time scales that are slow compared to the acoustic oscillation period. The acoustic force density depends on gradients in the density and compressibility of the fluid. For microfluidic systems, the theory predicts a relocation of the inhomogeneities into stable field-dependent configurations, which are qualitatively different from the horizontally layered configurations due to gravity. Experimental validation is obtained by confocal imaging of aqueous solutions in a glass-silicon microchip.","authors_text":"Henrik Bruus, Jonas T. Karlsen, Per Augustsson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-19T19:25:53Z","title":"The acoustic force density acting on inhomogeneous fluids in acoustic fields"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.06089","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":"sha256:43b4f17efff77bd1840d4bf600a09c6b5b18058125486d5c3062fc281ae794ed","target":"record","created_at":"2026-05-18T01:04:32Z","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":"8cdcbc6bf1454d47ffefad6b05c9ceccfabf964526dc204c617ee09a2b6eb3e3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2016-05-19T19:25:53Z","title_canon_sha256":"510ca3909386da1a25a690a804a6eab757bc2147ffaedddee6dc2a354548ac0d"},"schema_version":"1.0","source":{"id":"1605.06089","kind":"arxiv","version":1}},"canonical_sha256":"4390a1f732c0da87a8d48f8b0c1d3cc25df6e123107a9b9c449886215dc75cfc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4390a1f732c0da87a8d48f8b0c1d3cc25df6e123107a9b9c449886215dc75cfc","first_computed_at":"2026-05-18T01:04:32.750240Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:32.750240Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1k9fn2D/M0zN8SbT0dR1h79CkK4XY9asWFieesvEjR3B+MC7JibvoCsF45yvH8qv6tSuTd+5dYNYDoMhAaHGAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:32.750964Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.06089","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:43b4f17efff77bd1840d4bf600a09c6b5b18058125486d5c3062fc281ae794ed","sha256:67a8f6c81ce61522ad8c34b0d48a89ebf9367859e373fc14addb377da312a84d"],"state_sha256":"9f4a347a50c752a3c3370b2f0e02c8d9a9ff11c7a99e550d1b2cc0a20ecb337d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kbJkAdFIOjMk3n61fgw29JgKuzDDO9CHLxUHaIth8NyVxAgIta/I3+wXDFxYotqBlVoToOppjX5SqCUfDlp6BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T11:59:45.255135Z","bundle_sha256":"2a285a073ffb8eaf0172f56f74a5f8aa7f77b383b8dfc21eb66ff904041a0231"}}