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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 21 to 26 of 26 (0.015 seconds)| 21 |
Simulation du ruissellement d'eau de pluie sur des surfaces agricolesDelestre, Olivier 13 July 2010 (has links) (PDF)
L'objectif de ce travail est le développement d'un modèle et d'une méthode numérique adaptés à la simulation du ruissellement d'eau de pluie sur des surfaces agricoles. Pour cela, nous utilisons un système d'équations aux dérivées partielles pour les eaux peu profondes : le système de Saint Venant. La pluie et l'infiltration y sont pris en compte par l'ajout de termes source et le couplage avec un modèle d'infiltration. Le système étant hyperbolique et conservatif nous choisissons d'utiliser un schéma aux volumes finis avec reconstruction hydrostatique. Avec cette reconstruction nous obtenons un schéma permettant de traiter les équilibres stationnaires et les interfaces sec/mouillé dues aux événements pluvieux. Tout d'abord, nous effectuons une comparaison systématique de différents flux numériques, de différentes reconstructions d'ordre deux (MUSCL et ENO modifiées) et de différentes méthodes de traitement des frottements sur des solutions analytiques unidimensionnelles. Ces comparaisons nous permettent de choisir une méthode numérique adaptée à la simulation du ruissellement qui en outre capture les phénomènes de type roll-waves. Ensuite nous nous intéressons au traitement de la pluie et de l'infiltration à l'aide du modèle de Green-Ampt. Cette méthode généralisée en dimension deux est validée sur des résultats expérimentaux obtenus à l'INRA d'Orléans et à l'IRD. La méthode numérique choisie et validée a été implémentée dans FullSWOF_2D un logiciel libre écrit en C++ pour la simulation de ruissellement d'eau de pluie sur des surfaces agricoles.
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A porous field: immersive inter-media installation and blurring the boundaries of perceptionVerban, Alison Jane January 2007 (has links)
Through creative and theoretical research, this practice-led PhD project investigates the conditions that facilitate embodied sensory awareness within digital inter-media installation. Central to this exploration are questions concerning ‘immersion.’ The research uses this term to describe a transformation in perception that allows us to shake off representational and symbolic meaning in favour of embodied, sensory and intuitive awareness within an installation space. Drawing from embodied memories of immersion in natural and spiritual environments, I consider the elements that contributed to these experiences and ask whether it is possible to create this sense of immersion in art. I then consider the elements that produce immersive, inter-media environments including space, sound, light, and projected moving images. Drawing on theoretical and artistic precedents, I propose a set of principles for producing a sense of embodied sensory immersion. The practical outcomes of the research - three digital inter-media installations included in the exhibition, in an other light - incorporate different combinations and treatments of these material elements to investigate and test the proposed principles.
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Modern Fairy Tales: The New Existence of an Old Genre : Exemplified by the Books of Alan A. Milne, Tove Jansson and Eno RaudYashkina, Svetlana January 2016 (has links)
The aim of this study is to draw new perspectives to the theoretic approach towards the complex nature of the modern fairy tale genre and its transformation. The study is exemplified by two books by Alan A. Milne about Winnie-the-Pooh (1926-1928), Tove Jansson’s eight books about the Moomintrolls (1945-1970) and Eno Raud’s four books about three funny creatures called “Nakstitrallid” in Estonian (1972-1982). In this thesis, I examine the disputable problem of defining the fairy tale genre in modern literature and refer to the history of the genre and storytelling tradition that have indirectly inspired all three authors in their decision to turn for fairy tale as a genre. Applying the poetical analysis, I argue that these authors contributed to the continuity of fairy tales by creating the link between folkloric heritage, novelistic literary expression and children’s imagination. This study can therefore be considered as topological, however it does not pretend to introduce the complete systematic definition of the genre as the thesis’ format does not allow such in-depth investigation. In the first chapter, ‘Archaic world stimulation in modern fairy tale’, I examine the dominating literary categories that refer to the folk fairy tale intertext: Bakhtin’s concept of ‘chronotope’ – category of time and space, system of fictional allegoric characters and category of fantastic. In the second chapter, ‘Modern fairy tales from perspective of children’s literature’, I analyze the books of Milne, Jansson and Raud in the scope of narratological and aesthetic categories of children’s literature. The folkloric laughter intertextually reproduced by naïvism of the Moomins, the Naksitralls, and Winnie-the-Pooh’s friends, while folkloric collective hero is presented by universal harmony of a happy family and child-like protagonists. I came to the conclusion that poetics of folklore fairy tale still exists in these books through the intertextual dialogue. Modernism as literary method re-evaluates folkloric aspects such as nonlinear time, the blurred boarders between individual and cosmos, material and spirit, text and reality. Every new artistically unique fairy tale world resembles the new stage of the genre development. The more innovative is the story, the more sophisticated can be its poetics.
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Frauen schreiben KriegPape, Marion 02 February 2007 (has links)
Kein anderes Thema hat die nigerianische Literatur so dominiert wie der nigerianische Bürgerkrieg, in dessen Verarbeitung sich verstärkt auch Autorinnen einmischen. Die Dissertation evaluiert 34 Texte von 16 nigerianischen Autorinnen - 12 Romane und 22 Kurzgeschichten - und analysiert sie als Gesamtkorpus, in dem die Texte miteinander und mit der Männerliteratur einen Dialog um den Bürgerkrieg führen. Die Autorinnen wenden bei ihrem "war talk" literarische Strategien wie "re-reading" und "re-writing" an, das Neu-Lesen, Fort- und Umschreiben der Texte und Diskurse des "Zentrums", durch die nicht nur die Blindstellen eines von Männern dominierten literarischen Diskurses sichtbar werden, sondern durch die auch der Prozess des Aushandelns der Geschlechterverhältnisse sowie des Krieges selbst erfolgt, seiner Ursachen, Auslöser und Folgen. Die Autorinnen stellen den Krieg als "sexuelle Unordnung" dar, als Geschlechterkrieg. Die Untersuchung zeigt, dass bei der Verortung der Perspektive der Autorinnen neben Geschlecht, ethnischer Zugehörigkeit auch andere Faktoren, wie Alter, Race, Grad der Distanz oder Nähe etc. berücksichtigt werden müssen, um vorschnelle Festschreibungen zu vermeiden. Hierbei spielen die Paratexte eine wichtige Rolle, in denen die Autorinnen sich persönlich zum Krieg äußern. Die Arbeit bewegt sich an den Schnittstellen mehrerer Disziplinen: Literatur, Historiographie und Geschlechterstudien. In der Einleitung werden die theoretischen Prämissen im Kontext von Krieg, Geschlecht und literarischer Repäsentation behandelt. Das 1. Kapitel ist dem historischen Kontext des Bürgerkrieges, einschließlich der Rolle der Frauen darin gewidmet. Im 2. Kapitel geht es um die Darstellung des Krieges, des Selbst- und Feindbildes sowie der Zukunft. Das dritte Kapitel handelt von der Beziehung zwischen Bürger- und Geschlechterkrieg, vermittelt durch das Medium literarischer Text. Die Zusammenfassung der Ergebnisse und der Ausblick auf zukünftige Forschung erfolgt im Schlussteil. Der Anhang enthält ein vorläufiges Verzeichnis der gesamten Frauenliteratur über den nigerianischen Bürgerkrieg. / No other topic has dominated the Nigerian literature as much as the Nigerian Civil War and female authors increasingly interfere in its literary representation. The thesis evaluates 34 literary texts by 16 female Nigerian authors - 12 novels and 22 short stories - and analyses them as distinctive corpus whose individual texts are in a state of dialogue both with each other and with texts from male authors. The female authors use, in their "war talk", literary strategies like "re-reading" and "re-writing" of texts from the "Centre". On the one hand, these strategies enable them to make the blind spots of a male dominated literary discourse apparent/visible on the other hand, they facilitate the negotiation of gender relations and of the war itself, its causes, trigger points and consequences. The female authors represent war as "sexual disorder", as gender war. The study shows that in order to be able to locate an author''s perspective (and to avoid rash conclusions) it is essential to consider the different factors determining it - besides ethnicity and gender, also age, race, the grade of emotional involvement or distance etc. It is in this regard, where the paratexts play an important part, as in these authors express their personal views and comments on the war. The thesis is located at the interfaces of several disciplines: literary, historical and gender studies. The introduction deals with the theoretical backgrounds in the context of war, literary representation and gender. The first chapter is dedicated to the historical context of the Nigerian Civil War including the role of women. The second chapter looks at the paratexts, different representations of the war''s causes, the self-image, the enemy''s image and the future. The third chapter finally deals with the question how the relationship between Civil War and gender war is negotiated/conveyed through the medium of the literary texts. In the conclusion the results are summarized and prospects for future research are discussed. The appendix contains a preliminary bibliography of all literary texts on the Nigerian Civil War written by female authors.
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Development of High-order CENO Finite-volume Schemes with Block-based Adaptive Mesh Refinement (AMR)Ivan, Lucian 31 August 2011 (has links)
A high-order central essentially non-oscillatory (CENO) finite-volume scheme in combination with a block-based adaptive mesh refinement (AMR) algorithm is proposed for solution of hyperbolic and elliptic systems of conservation laws on body- fitted multi-block mesh. The spatial discretization of the hyperbolic (inviscid) terms is based on a hybrid solution reconstruction procedure that combines an unlimited high-order k-exact least-squares
reconstruction technique following from a fixed central stencil with a monotonicity preserving limited piecewise linear reconstruction algorithm. The limited reconstruction is applied to computational cells with under-resolved solution content and the unlimited k-exact reconstruction
procedure is used for cells in which the solution is fully resolved. Switching in the
hybrid procedure is determined by a solution smoothness indicator. The hybrid approach
avoids the complexity associated with other ENO schemes that require reconstruction on
multiple stencils and therefore, would seem very well suited for extension to unstructured meshes. The high-order elliptic (viscous) fluxes are computed based on a k-order accurate average gradient derived from a (k+1)-order accurate reconstruction. A novel h-refinement criterion based on the solution smoothness indicator is used to direct the steady and unsteady refinement of the AMR mesh. The predictive capabilities of the proposed high-order AMR scheme are demonstrated for the Euler and Navier-Stokes equations governing two-dimensional
compressible gaseous flows as well as for advection-diffusion problems characterized
by the full range of Peclet numbers, Pe. The ability of the scheme to accurately represent
solutions with smooth extrema and yet robustly handle under-resolved and/or non-smooth solution content (i.e., shocks and other discontinuities) is shown for a range of problems. Moreover, the ability to perform mesh refinement in regions of smooth but under-resolved and/or non-smooth solution content to achieve the desired resolution is also demonstrated.
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Development of High-order CENO Finite-volume Schemes with Block-based Adaptive Mesh Refinement (AMR)Ivan, Lucian 31 August 2011 (has links)
A high-order central essentially non-oscillatory (CENO) finite-volume scheme in combination with a block-based adaptive mesh refinement (AMR) algorithm is proposed for solution of hyperbolic and elliptic systems of conservation laws on body- fitted multi-block mesh. The spatial discretization of the hyperbolic (inviscid) terms is based on a hybrid solution reconstruction procedure that combines an unlimited high-order k-exact least-squares
reconstruction technique following from a fixed central stencil with a monotonicity preserving limited piecewise linear reconstruction algorithm. The limited reconstruction is applied to computational cells with under-resolved solution content and the unlimited k-exact reconstruction
procedure is used for cells in which the solution is fully resolved. Switching in the
hybrid procedure is determined by a solution smoothness indicator. The hybrid approach
avoids the complexity associated with other ENO schemes that require reconstruction on
multiple stencils and therefore, would seem very well suited for extension to unstructured meshes. The high-order elliptic (viscous) fluxes are computed based on a k-order accurate average gradient derived from a (k+1)-order accurate reconstruction. A novel h-refinement criterion based on the solution smoothness indicator is used to direct the steady and unsteady refinement of the AMR mesh. The predictive capabilities of the proposed high-order AMR scheme are demonstrated for the Euler and Navier-Stokes equations governing two-dimensional
compressible gaseous flows as well as for advection-diffusion problems characterized
by the full range of Peclet numbers, Pe. The ability of the scheme to accurately represent
solutions with smooth extrema and yet robustly handle under-resolved and/or non-smooth solution content (i.e., shocks and other discontinuities) is shown for a range of problems. Moreover, the ability to perform mesh refinement in regions of smooth but under-resolved and/or non-smooth solution content to achieve the desired resolution is also demonstrated.
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