Ce mémoire interroge la place qu’occupe le personnage historique, Joris-Karl Huysmans (1848-1907) dans le roman Soumission (2015) de Michel Houellebecq. Située en France en 2022, l’histoire met en scène François, spécialiste de Huysmans. Afin de cerner le rôle de Huysmans dans l’histoire, nous nous sommes intéressée à l’amitié que François exprime pour lui, leurs affinités et leurs divergences. Les polémiques suscitées lors de la parution du roman nous ont poussé à également considérer la moralité de l’histoire. L’aspect temporel du roman, situé dans un futur proche, est important car il laisse supposer une comparaison. Ainsi, notamment la notion de politique-fiction - anticipation de faible amplitude -, ainsi que des concepts narratologiques empruntés à Genette - transtextualité, voix et mode -, ont fourni des outils d’analyse. De même, la recherche de Viard sur la vision politique de Houellebecq, et sa conception comtienne de la religion, a servi de guide. En premier lieu, nous avons ainsi montré que Houellebecq a créé l’illusion d’une réalité possible dans un cadre familier aux lecteurs, puis, en deuxième lieu, nous avons constaté que le narrateur est autodiégétique et la focalisation interne, ce qui nous a permis de faire le rapprochement entre le héros et la vie et l’oeuvre de Huysmans. Plus loin, l’association des caractéristiques de la politique fiction avec les fonctions testimoniale et idéologique du narrateur ont fait apparaître la figure de Huysmans comme plus largement le représentant de la décadence de la modernité. La vision antilibérale et critique exprimée par François rappelle donc le désenchantement dans la littérature « fin de siècle » dont Huysmans était un grand représentant. De plus nous avons constaté que si François et Huysmans ne partagent pas la même vision de la religion, ils partagent le même idéal conservateur de la femme et du couple. Enfin, ces éléments réunis, nous en sommes arrivée à la conclusion que plutôt que nihiliste, la moralité exprimée serait altruiste. / This essay interrogates the part played by the historical figure, Joris-Karl Huysmans (1848-1907) in Michel Houellebecqs novel Submission (2015). The story, set in France in 2022, revolves around François, specialist in Huysmans. In order to establish Huysmans role, we have focalized on François’s friendship, expressed by him, their affinities and their differences. The polemics brought on when the novel was published has also made us consider the moral of the story. The temporal aspect is important since it underscores a comparison between a plot set in the future and a historical figure. Here especially one notion of political fiction – speculation in a nearby future – has proven useful. It was furthermore the case of concepts in the field of narratology developed by Genette, intertextuality and metatextuality, voice and mode. Moreover, we have been guided by Viards theory regarding Houellebecqs political view as well as his vision on religion, inspired by Auguste Comte. Considered all together, this shows that Houellebecq has created an illusion of reality taking place in a familiar environment to which readers can relate. Further on, the narrator being homo-diegetic with an internally focalized perspective, makes it possible for us to conciliate the life of the hero with the life and works of Huysmans. We have also seen that the notions of political fiction, combined with the testimonial and ideological functions of the narrator, relates to the character of Huysmans as a representant of the decadency of modernity. Moreover, François’s anti-liberal and critical vision of France has a clear affinity with the disenchantment expressed in the 19th century, fin de siècle literature, of which Huysmans was a principal figure. We argue that although François and Huysmans don’t share the same vision of religion, they share the same conservative ideal of femininity and the couple. This all together has led us to the conclusion that the moral of the story rather than nihilistic is altruistic.

Dans cette thèse nous nous intéressons aux singularités d'espaces analytiques complexes définis comme le lieu des zéros d'un morphisme sans pente. Nous étudions dans un premier temps les cycles proches et les cycles évanescents associés à un tel morphisme. Dans un deuxième temps nous cherchons à comprendre la théorie de Hodge des morphismes sans pente.La première partie de cette thèse est consacrée à apporter des compléments au travail de P. Maisonobe sur les morphismes sans pente. Nous commençons par construire un morphisme de comparaison entre cycles proches algébriques (pour les $mathscr{D}$-modules) et cycles proches topologiques (pour les faisceaux pervers). Nous montrons ensuite que ce morphisme est un isomorphisme dans le cas d'un morphisme sans pente. Enfin nous construisons un foncteur cycles évanescents topologiques pour un morphisme sans pente et nous démontrons que ce foncteur et le foncteur cycles proches topologiques de P. Maisonobe se placent dans le diagramme de triangles exacts attendu.Dans la seconde partie de cette thèse nous étudions les morphismes sans pente pour les modules de Hodge mixtes. Nous démontrons dans un premier temps la commutativité des cycles proches et des cycles évanescents itérés appliqués à un module de Hodge mixte dans le cas d'un morphisme sans pente. Dans un deuxième temps nous définissons la notion << strictement sans pente >> pour un module de Hodge mixte et nous démontrons sa stabilité par image directe propre. Nous démontrons comme application la compatibilité de la filtration de Hodge et des filtrations de Kashiwara-Malgrange pour certains modules de Hodge purs supportés sur une hypersurface à singularités quasi-ordinaires. / In this thesis we are interested in singularities of complex varieties defined as the zero locus of a morphism without slope. In a first time we study nearby cycles and vanishing cycles associated to such morphisms. In a second time we want to understand Hodge theory of morphisms without slope.The first part of this thesis is devoted to add some complements to the work of P. Maisonobe on morphisms without slope. We start with the construction of a comparison morphism between algebraic nearby cycles (for $mathscr{D}$-modules) and topological nearby cycles (for perverse sheaves). Then we show that this morphism is an isomorphism in the case of a morphism without slope. Finally we construct a topological vanishing cycles functor for a morphism without slope et we prove that this functor and the topological nearby cycles functor of P. Maisonobe fit into the expected diagram of exact triangles.In the second part of the thesis we study morphisms without slope for mixed Hodge modules. We first show the commutativity of iterated nearby cycles and vanishing cycles applied to a mixed Hodge module in the case of a morphism without slope. Second we define the notion "strictly without slope" for a mixed Hodge module and we show that it is preserved by proper direct image. As an application we prove the compatibility of the Hodge filtration and Kashiwara-Malgrange filtrations for some pure Hodge modules with support an hypersurface with quasi-ordinary singularities.

In light of increasing harmful algal blooms and the need to protect human health and aquatic resources, proactive management approaches merit further study. For this purpose I conducted field samplings to characterize plankton community composition and laboratory experiments to test some approaches to new management schemes in the lower Rincon Delta. On site measurements and microscopic analysis showed that environmental parameters and plankton community composition varied considerably among sampling stations and sampling dates. A recent modeling study suggested that manipulation of freshwater inflow to estuaries might prevent phytoplankton blooms and enhance secondary productivity. To test this theory I conducted three semi-continuous design and flow-through incubation design experiments using natural plankton assemblages. I investigated the effect of two different pulsing regimes of inflow and nutrient loading on zooplankton densities, and phytoplankton biomass and diversity. Despite differences in zooplankton structure and phytoplankton community composition between the two experiment designs, the results confirmed that pulsed inflows might alter plankton dynamics. My findings showed that 3-day pulse treatments consistently supported greater zooplankton densities and higher phytoplankton species diversity when compared to 1-day pulse treatments. In addition, accumulation of phytoplankton biovolume remained low during 3-day pulse treatments. Differences in zooplankton performance between 3-day pulse and 1-day pulse inflow treatments were likely due to the ability of phytoplankton to uptake and store greater amounts of nutrients under conditions of 3-day pulse inflow. This resulted in food of higher quality for zooplankton, and might have supported greater zooplankton population growth rates. Additionally, in an attempt to understand the mechanisms leading to high biodiversity in aquatic ecosystems, I built a resource-storage model and studied the effects of resource-storage on competition of multiple phytoplankton species on multiple abiotic resources. I compared this model with a well-established multi-species competition model. My results showed that for certain species combinations a resource-storage-based model can generate dissimilar outcomes when compared to a model without resource-storage.

In light of increasing harmful algal blooms and the need to protect human health and aquatic resources, proactive management approaches merit further study. For this purpose I conducted field samplings to characterize plankton community composition and laboratory experiments to test some approaches to new management schemes in the lower Rincon Delta. On site measurements and microscopic analysis showed that environmental parameters and plankton community composition varied considerably among sampling stations and sampling dates. A recent modeling study suggested that manipulation of freshwater inflow to estuaries might prevent phytoplankton blooms and enhance secondary productivity. To test this theory I conducted three semi-continuous design and flow-through incubation design experiments using natural plankton assemblages. I investigated the effect of two different pulsing regimes of inflow and nutrient loading on zooplankton densities, and phytoplankton biomass and diversity. Despite differences in zooplankton structure and phytoplankton community composition between the two experiment designs, the results confirmed that pulsed inflows might alter plankton dynamics. My findings showed that 3-day pulse treatments consistently supported greater zooplankton densities and higher phytoplankton species diversity when compared to 1-day pulse treatments. In addition, accumulation of phytoplankton biovolume remained low during 3-day pulse treatments. Differences in zooplankton performance between 3-day pulse and 1-day pulse inflow treatments were likely due to the ability of phytoplankton to uptake and store greater amounts of nutrients under conditions of 3-day pulse inflow. This resulted in food of higher quality for zooplankton, and might have supported greater zooplankton population growth rates. Additionally, in an attempt to understand the mechanisms leading to high biodiversity in aquatic ecosystems, I built a resource-storage model and studied the effects of resource-storage on competition of multiple phytoplankton species on multiple abiotic resources. I compared this model with a well-established multi-species competition model. My results showed that for certain species combinations a resource-storage-based model can generate dissimilar outcomes when compared to a model without resource-storage.