@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f> a dcat:Dataset ;
    dct:description """This data was used for main results for the paper entitled "Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability".
We could calculate relative phase fluctuation and Allan deviation for both Yb optical clocks and 10 GHz microwaves. Uncertainty of our down-conversion system was also calculated from this.""" ;
    dct:identifier "ark:/88434/mds2-2206" ;
    dct:issued "2020-04-09"^^xsd:date ;
    dct:language "{en}" ;
    dct:modified "2020-04-08T00:00:00"^^xsd:dateTime ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Data for \"Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability\"" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Takuma Nakamura" ;
            vcard:hasEmail <mailto:takuma.nakamura@nist.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/43178f0b-c974-4c23-8627-d69ad0d64932>,
        <https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/50a79ea7-daa8-4242-80c8-10b3f95a9969>,
        <https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/5b40057e-489b-4e56-a425-f163af308c9e>,
        <https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/5fa5a58e-dbaa-4313-8bc2-1232e1e916e0>,
        <https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/7cab1bd9-546a-4f13-a17b-42f6eb5f8a95> ;
    dcat:keyword "amerigeo",
        "amerigeoss",
        "ckan",
        "frequency-comb",
        "geo",
        "geoss",
        "low-noise-microwave-generation",
        "national",
        "north-america",
        "optical-clock",
        "optical-frequency-division",
        "united-states" ;
    dcat:theme <%7B%22Metrology:Time%20and%20frequency%20metrology%22%7D> .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/43178f0b-c974-4c23-8627-d69ad0d64932> a dcat:Distribution ;
    dct:description "Time, Phase(rad)" ;
    dct:format "XLS" ;
    dct:issued "2022-08-07T18:19:18.175254"^^xsd:dateTime ;
    dct:modified "2025-11-20T19:18:05.607780"^^xsd:dateTime ;
    dct:title "Yb clock phase" ;
    dcat:accessURL <https://data.nist.gov/od/ds/mds2-2206/Yb_Clock_phase%28rad%29%20vs%20time.csv> ;
    dcat:mediaType "application/vnd.ms-excel" .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/50a79ea7-daa8-4242-80c8-10b3f95a9969> a dcat:Distribution ;
    dct:format "TEXT" ;
    dct:issued "2022-08-07T18:19:18.175240"^^xsd:dateTime ;
    dct:modified "2025-11-20T19:18:05.606563"^^xsd:dateTime ;
    dct:title "SHA256 File for 10GHz microwave phase" ;
    dcat:accessURL <https://data.nist.gov/od/ds/mds2-2206/10GHz_phase%28mrad%29%20vs%20time.csv.sha256> ;
    dcat:mediaType "text/plain" .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/5b40057e-489b-4e56-a425-f163af308c9e> a dcat:Distribution ;
    dct:description "first column is time, second is relative phase (mrad)" ;
    dct:format "XLS" ;
    dct:issued "2022-08-07T18:19:18.175246"^^xsd:dateTime ;
    dct:modified "2025-11-20T19:18:05.607001"^^xsd:dateTime ;
    dct:title "10GHz microwave phase" ;
    dcat:accessURL <https://data.nist.gov/od/ds/mds2-2206/10GHz_phase%28mrad%29%20vs%20time.csv> ;
    dcat:mediaType "application/vnd.ms-excel" .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/5fa5a58e-dbaa-4313-8bc2-1232e1e916e0> a dcat:Distribution ;
    dct:format "TEXT" ;
    dct:issued "2022-08-07T18:19:18.175250"^^xsd:dateTime ;
    dct:modified "2025-11-20T19:18:05.607396"^^xsd:dateTime ;
    dct:title "SHA256 File for Yb clock phase" ;
    dcat:accessURL <https://data.nist.gov/od/ds/mds2-2206/Yb_Clock_phase%28rad%29%20vs%20time.csv.sha256> ;
    dcat:mediaType "text/plain" .

<https://data.amerigeoss.org/dataset/30c972ef-2383-406b-b9c7-c7baaa708b0f/resource/7cab1bd9-546a-4f13-a17b-42f6eb5f8a95> a dcat:Distribution ;
    dct:issued "2022-08-07T18:19:18.175258"^^xsd:dateTime ;
    dct:modified "2025-11-20T19:18:05.608170"^^xsd:dateTime ;
    dct:title "DOI access to Data for 'Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability'" ;
    dcat:accessURL <https://doi.org/10.18434/M32206> .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .