@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://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00686752v1> a dcat:Dataset ;
    dct:description """
              Cometary Globules are small dense clouds commonly found in the surroundings of OB stars in HII regions. We present a detailed study, both numerical and analytical, of the "Radiation-Driven Implosion" model. It is shown that this model alone, based on the photo-ionisation by neighbouring stars, can account for the formation and the evolution of Cometary Globules. It is a two-stage process : a brief collapse phase, followed by the commonly observed and much longer cometary phase. Only the first stage has an unambiguous spectroscopie signature. We show that under some ionisation criteria small-scale and large-scale instabilities may grow at the cloud's surface, eventually leading to the cloud disruption. An analytic study shows that all clouds in the cometary stage are supported by a static magnetic field and are gravitationally stable. From simulations, we generated emissivity maps and position-velocity diagrams in order to allow a direct observational confrontation with our model. We observed CG7S, a cloud which appears to be in the pre-cometary stage. The kinematic properties of CG7S are simply explained by the Radiation-Driven Implosion model and well reproduced numerically
            """ ;
    dct:identifier "tel-00686752" ;
    dct:issued "2026-05-22T05:57:33.104787"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-22T05:57:33.104792"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Formation et évolution des globules cométaires" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00686752v1/resource/28a8ba0c-1f30-4b5e-a2a6-288671deb521> ;
    dcat:keyword "cg7s",
        "code-hydrodynamique",
        "globules-cometaires",
        "infoeu-reposemanticsdoctoralthesis",
        "modelisation",
        "morphologie",
        "observations",
        "physastrsrphysics-physicsastrophysics-astro-phsolar-and-stellar-astrophysics-astro-phsr",
        "sduastrsrsciences-of-the-universe-physicsastrophysics-astro-phsolar-and-stellar-astrophysi",
        "theses" ;
    dcat:landingPage <https://theses.hal.science/tel-00686752> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00686752v1/resource/28a8ba0c-1f30-4b5e-a2a6-288671deb521> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-22T05:57:33.235795"^^xsd:dateTime ;
    dct:modified "2026-05-22T05:57:33.072177"^^xsd:dateTime ;
    dct:title "Formation et évolution des globules cométaires" ;
    dcat:accessURL <https://theses.hal.science/tel-00686752> .

<https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> a foaf:Agent ;
    foaf:name "test_moissonnage_selune" .

<https://theses.hal.science/tel-00686752> a foaf:Document .