@prefix mdl: <http://data.loterre.fr/ark:/67375/MDL> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

mdl:-B5FFXLWN-L
  skos:hiddenLabel "Méthode ordonnée discrète"@fr, "discrete ordinate methods"@en, "Discrete ordinate method"@en, "Méthode ordonnées discrètes"@fr, "méthodes des ordonnées discrètes"@fr ;
  skos:definition "La méthode SN (S pour segmented) ou méthode des ordonnées discrètes permet la résolution de l'équation du transfert radiatif ou équation de Boltzmann utilisée pour la propagation des particules telles photons, neutrons, neutrinos, etc. Cette méthode a été introduite par Gian-Carlo Wick (1943) et Subrahmanyan Chandrasekhar (1944). Elle consiste à remplacer l'équation continue vis-à-vis des directions de propagation par un système linéaire portant sur des directions choisies a priori. (Wikipedia, L'Encylopédie Libre, <a href=\"https://fr.wikipedia.org/wiki/M%C3%A9thode_SN\" target=\"_blank\">https://fr.wikipedia.org/wiki/M%C3%A9thode_SN</a>)"@fr, "In the theory of radiative transfer, of either thermal or neutron radiation, a position and direction-dependent intensity function is usually sought for the description of the radiation field. The intensity field can in principle be solved from the integrodifferential radiative transfer equation (RTE), but an exact solution is usually impossible and even in the case of geometrically simple systems can contain unusual special functions such as the Chandrasekhar's H-function and Chandrasekhar's X- and Y-functions. The method of discrete ordinates, or the Sn method, is one way to approximately solve the RTE by discretizing both the xyz-domain and the angular variables that specify the direction of radiation. The methods were developed by Subrahmanyan Chandrasekhar when he was working on radiative transfer. (Wikipedia, The Free Encyclopedia, <a href=\"https://en.wikipedia.org/wiki/Discrete_ordinates_method\" target=\"_blank\">https://en.wikipedia.org/wiki/Discrete_ordinates_method</a>)"@en ;
  skos:inScheme mdl: ;
  skos:broader mdl:-BVSV1HR1-Q ;
  skos:exactMatch <https://en.wikipedia.org/wiki/Discrete_ordinates_method>, <https://fr.wikipedia.org/wiki/M%C3%A9thode_SN> ;
  skos:prefLabel "méthode des ordonnées discrètes"@fr, "discrete ordinate method"@en ;
  skos:related mdl:-FBJ5H1M5-T, mdl:-FWBK78RF-3 ;
  a skos:Concept .

mdl:-FBJ5H1M5-T
  skos:prefLabel "radiative transfer"@en, "transfert radiatif"@fr ;
  a skos:Concept ;
  skos:related mdl:-B5FFXLWN-L .

mdl:-FWBK78RF-3
  skos:prefLabel "Boltzmann equation"@en, "équation de Boltzmann"@fr ;
  a skos:Concept ;
  skos:related mdl:-B5FFXLWN-L .

mdl:-BVSV1HR1-Q
  skos:prefLabel "résolution d'équations"@fr, "equation solving"@en ;
  a skos:Concept ;
  skos:narrower mdl:-B5FFXLWN-L .

mdl: a skos:ConceptScheme .