@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#> .

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    dct:description "<p>The Visible Nulling Coronagraph (VNC) is a starlight suppression system for enabling exoplanet detection<br />and atmospheric measurement. Conceptual space telescope missions including the large UV/optical/IR<br />(LUVOIR) surveyor require such a starlight suppression system to carry out the scientific goals associated<br />with directly imaging nearby worlds. Direct imaging is complementary to upcoming missions like TESS, and<br />should eventually enable access to the &gt; 95% of habitable worlds outside of transit discovery space.<br />This IRAD supports near-term work to 1) fabricate and test symmetric broad-<br />band interferometric nulling optics; 2) demonstrate automated fine alignment of the Segmented Aperture<br />Interferometric Nulling Testbed (SAINT) primary mirror; 3) quantify performance of the SAINT closed-loop<br />fine pointing system; and 4) assemble, align and demonstrate a radial shear first order implementation of a<br />system known as the Phase-Occulation Nulling Coronagraph (PONC).</p>" ;
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    dct:issued "2018-09-01"^^xsd:date ;
    dct:modified "2020-01-29"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:title "Broadband Active Segmented Aperture and Radial Shear Nulling" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "TECHPORT SUPPORT" ;
            vcard:hasEmail <mailto:hq-techport@mail.nasa.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/6e6bcc9b-5797-4f40-8b74-aa3afadb7304/resource/7effaa47-db03-488c-931b-c46522e7fc00>,
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        "national",
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        "united-states" .

<https://data.amerigeoss.org/dataset/6e6bcc9b-5797-4f40-8b74-aa3afadb7304/resource/7effaa47-db03-488c-931b-c46522e7fc00> a dcat:Distribution ;
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    dct:issued "2020-11-12T04:33:14.828346"^^xsd:dateTime ;
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    dct:title "Broadband Active Segmented Aperture and Radial Shear Nulling" ;
    dcat:accessURL <https://techport.nasa.gov/api/projects/93238> ;
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<https://data.amerigeoss.org/dataset/6e6bcc9b-5797-4f40-8b74-aa3afadb7304/resource/8b305ba1-3f99-4550-9b2a-5f5743c28c1c> a dcat:Distribution ;
    dct:description "Techport Project XML Metadata" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:33:14.828352"^^xsd:dateTime ;
    dct:modified "2025-11-22T13:29:23.119918"^^xsd:dateTime ;
    dct:title "Broadband Active Segmented Aperture and Radial Shear Nulling" ;
    dcat:accessURL <https://techport.nasa.gov/api/projects/93238.xml> ;
    dcat:mediaType "text/html" .

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    dct:format "HTML" ;
    dct:issued "2020-11-12T04:33:14.828336"^^xsd:dateTime ;
    dct:modified "2025-11-22T13:29:23.119051"^^xsd:dateTime ;
    dct:title "Broadband Active Segmented Aperture and Radial Shear Nulling" ;
    dcat:accessURL <https://techport.nasa.gov/view/93238> ;
    dcat:mediaType "text/html" .

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    dct:description "Techport Project PDF Export" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:33:14.828357"^^xsd:dateTime ;
    dct:modified "2025-11-22T13:29:23.120326"^^xsd:dateTime ;
    dct:title "Broadband Active Segmented Aperture and Radial Shear Nulling" ;
    dcat:accessURL <https://techport.nasa.gov/datasheet/93238> ;
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