{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:7RZYGTYPTJ7LG3H7OP5PVDEJDT","short_pith_number":"pith:7RZYGTYP","schema_version":"1.0","canonical_sha256":"fc73834f0f9a7eb36cff73fafa8c891cef7bb1bf71134b7f463bc698a8d120e1","source":{"kind":"arxiv","id":"2605.23279","version":1},"attestation_state":"computed","paper":{"title":"In situ estimation of local acoustic pressure amplitude by force balancing with a ferrofluid droplet probe","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Akira Nagakubo, Norikazu Nishiyama, Seiya Usui, Yoshiaki Uchida","submitted_at":"2026-05-22T06:39:25Z","abstract_excerpt":"Acoustic tweezers enable non-contact manipulation of microscale objects, but quantitative in situ evaluation of the peak local pressure amplitude remains difficult in confined devices. Conventional hydrophone-based measurements are often limited at the microscale by probe size and installation constraints. Here, we present a force-balance method in which a trapped ferrofluid droplet serves as a local probe in a standing-wave acoustic field and an externally applied magnetic-field gradient is tuned so that the magnetic force balances the maximum primary acoustic radiation force on the droplet. "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2605.23279","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-22T06:39:25Z","cross_cats_sorted":[],"title_canon_sha256":"070a8a4bce61db9c3283df9115230990357dacf1903f379e8b4b2754ba0e7983","abstract_canon_sha256":"5bca9886da8590e0a3dc463fa6f4700c1b5864abe76c37fa869decbbc7858386"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-25T02:01:47.039143Z","signature_b64":"RjW5yyPv+4UJOu3MqLxU7ZN2pNGW3JGRbiKHp6ut1hbmPXT8z5WCB7oHHExlFLZX9gP11y190Tk1vZk/FOruCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc73834f0f9a7eb36cff73fafa8c891cef7bb1bf71134b7f463bc698a8d120e1","last_reissued_at":"2026-05-25T02:01:47.038581Z","signature_status":"signed_v1","first_computed_at":"2026-05-25T02:01:47.038581Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"In situ estimation of local acoustic pressure amplitude by force balancing with a ferrofluid droplet probe","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Akira Nagakubo, Norikazu Nishiyama, Seiya Usui, Yoshiaki Uchida","submitted_at":"2026-05-22T06:39:25Z","abstract_excerpt":"Acoustic tweezers enable non-contact manipulation of microscale objects, but quantitative in situ evaluation of the peak local pressure amplitude remains difficult in confined devices. Conventional hydrophone-based measurements are often limited at the microscale by probe size and installation constraints. Here, we present a force-balance method in which a trapped ferrofluid droplet serves as a local probe in a standing-wave acoustic field and an externally applied magnetic-field gradient is tuned so that the magnetic force balances the maximum primary acoustic radiation force on the droplet. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.23279","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/2605.23279/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2605.23279","created_at":"2026-05-25T02:01:47.038672+00:00"},{"alias_kind":"arxiv_version","alias_value":"2605.23279v1","created_at":"2026-05-25T02:01:47.038672+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.23279","created_at":"2026-05-25T02:01:47.038672+00:00"},{"alias_kind":"pith_short_12","alias_value":"7RZYGTYPTJ7L","created_at":"2026-05-25T02:01:47.038672+00:00"},{"alias_kind":"pith_short_16","alias_value":"7RZYGTYPTJ7LG3H7","created_at":"2026-05-25T02:01:47.038672+00:00"},{"alias_kind":"pith_short_8","alias_value":"7RZYGTYP","created_at":"2026-05-25T02:01:47.038672+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT","json":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT.json","graph_json":"https://pith.science/api/pith-number/7RZYGTYPTJ7LG3H7OP5PVDEJDT/graph.json","events_json":"https://pith.science/api/pith-number/7RZYGTYPTJ7LG3H7OP5PVDEJDT/events.json","paper":"https://pith.science/paper/7RZYGTYP"},"agent_actions":{"view_html":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT","download_json":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT.json","view_paper":"https://pith.science/paper/7RZYGTYP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2605.23279&json=true","fetch_graph":"https://pith.science/api/pith-number/7RZYGTYPTJ7LG3H7OP5PVDEJDT/graph.json","fetch_events":"https://pith.science/api/pith-number/7RZYGTYPTJ7LG3H7OP5PVDEJDT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT/action/storage_attestation","attest_author":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT/action/author_attestation","sign_citation":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT/action/citation_signature","submit_replication":"https://pith.science/pith/7RZYGTYPTJ7LG3H7OP5PVDEJDT/action/replication_record"}},"created_at":"2026-05-25T02:01:47.038672+00:00","updated_at":"2026-05-25T02:01:47.038672+00:00"}