{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2005:4L2KIE7VCZ7PJDPESKICGMADCP","short_pith_number":"pith:4L2KIE7V","schema_version":"1.0","canonical_sha256":"e2f4a413f5167ef48de4929023300313eb546ed23f03aae07068d43be77ab7c5","source":{"kind":"arxiv","id":"cond-mat/0509327","version":1},"attestation_state":"computed","paper":{"title":"NMR measurements of hyperpolarized 3He gas diffusion in high porosity silica aerogels","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Genevi\\`eve Tastevin (LKB - Lhomond), Pierre-Jean Nacher (LKB - Lhomond)","submitted_at":"2005-09-13T12:23:14Z","abstract_excerpt":"Hyperpolarized 3He is used to nondestructively probe by NMR the structure of custom-made and commercial silica aerogels (97% and 98.5% porous). Large spin-echo signals are obtained at room temperature and very low magnetic field (2mT) even with small mounts of gas. Attenuation induced by applied field gradients results from the combined effects of gas diffusion and confinement by the porous medium on atomic motion. Nitrogen is used as a buffer gas to reach equivalent 3He pressures ranging from 5 mbars to 3.5 bars. The observed pressure dependence suggests a non-uniform structure of the aerogel"},"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":"cond-mat/0509327","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2005-09-13T12:23:14Z","cross_cats_sorted":[],"title_canon_sha256":"76d5b8f748da1a0e260899f5e0238587463d5255c087181a54e9d853ccc29234","abstract_canon_sha256":"ee5f72c373384f016e5a927cb807153fc03badf389e57409e9a8af8e4b30ddcc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:08:58.028894Z","signature_b64":"3ECqNkqteKwdofA/b/s+VewCgLjraGYTQSfegt7256NX1npewldZys/RvdHrFWVBCEQAJaqIl60wzFIznscMDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e2f4a413f5167ef48de4929023300313eb546ed23f03aae07068d43be77ab7c5","last_reissued_at":"2026-05-18T01:08:58.028164Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:08:58.028164Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"NMR measurements of hyperpolarized 3He gas diffusion in high porosity silica aerogels","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Genevi\\`eve Tastevin (LKB - Lhomond), Pierre-Jean Nacher (LKB - Lhomond)","submitted_at":"2005-09-13T12:23:14Z","abstract_excerpt":"Hyperpolarized 3He is used to nondestructively probe by NMR the structure of custom-made and commercial silica aerogels (97% and 98.5% porous). Large spin-echo signals are obtained at room temperature and very low magnetic field (2mT) even with small mounts of gas. Attenuation induced by applied field gradients results from the combined effects of gas diffusion and confinement by the porous medium on atomic motion. Nitrogen is used as a buffer gas to reach equivalent 3He pressures ranging from 5 mbars to 3.5 bars. The observed pressure dependence suggests a non-uniform structure of the aerogel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0509327","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0509327","created_at":"2026-05-18T01:08:58.028272+00:00"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0509327v1","created_at":"2026-05-18T01:08:58.028272+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0509327","created_at":"2026-05-18T01:08:58.028272+00:00"},{"alias_kind":"pith_short_12","alias_value":"4L2KIE7VCZ7P","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_16","alias_value":"4L2KIE7VCZ7PJDPE","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_8","alias_value":"4L2KIE7V","created_at":"2026-05-18T12:25:52.687210+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/4L2KIE7VCZ7PJDPESKICGMADCP","json":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP.json","graph_json":"https://pith.science/api/pith-number/4L2KIE7VCZ7PJDPESKICGMADCP/graph.json","events_json":"https://pith.science/api/pith-number/4L2KIE7VCZ7PJDPESKICGMADCP/events.json","paper":"https://pith.science/paper/4L2KIE7V"},"agent_actions":{"view_html":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP","download_json":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP.json","view_paper":"https://pith.science/paper/4L2KIE7V","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=cond-mat/0509327&json=true","fetch_graph":"https://pith.science/api/pith-number/4L2KIE7VCZ7PJDPESKICGMADCP/graph.json","fetch_events":"https://pith.science/api/pith-number/4L2KIE7VCZ7PJDPESKICGMADCP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP/action/storage_attestation","attest_author":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP/action/author_attestation","sign_citation":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP/action/citation_signature","submit_replication":"https://pith.science/pith/4L2KIE7VCZ7PJDPESKICGMADCP/action/replication_record"}},"created_at":"2026-05-18T01:08:58.028272+00:00","updated_at":"2026-05-18T01:08:58.028272+00:00"}