This thesis explores the zombie’s rise to prominence in popular culture, with a focus on its development within the comics medium. The zombie is not just a ‘floating signifier’ (according to Jerrold E. Hogle), but a revenant signifier, actively and aggressively linking with existing concepts, and transforming them. The thesis also considers both the zombie figure and zombie genre within the parameters of several media – comics, television, film, and literature. The medium of comics is examined in detail as it has evolved through the influence of the zombie just as the zombie has been reshaped by each new representation. In contemporary horror comics, The Walking Dead series is not just commercially successful, it exploits properties of the medium (including panel arrangement, transitions, repetition, and the liminal space within the gutter) to thoroughly explore the metaphors and allusions that have been associated with the zombie. I discuss these metaphors by charting the zombie’s development. A lack of pre-twentieth century literary texts featuring this creature frustrates easy comparison with the monsters of Gothic fiction. Rather than evolving within the novel form, as its rival horror icons have done, the zombie has maintained a visual and visceral identity, maturing with each new incarnation, and becoming ever more gruesome: the walking corpses of ancient texts; a symbol of eternal slavery within Haitian Voodoo folklore; and its modern interpretation as violent and virulent monster. The recent notion of a zombie plague has redefined the creature as a representation of modern fears, and has led to ‘zombie apocalypse’ becoming a commonly-used fantasy scenario. The zombie’s connection to apocalyptic literature is simultaneously ancient and contemporary, with the creature being a signifier of social disorder and disrupted identity. While the emphasis throughout is on the shifting relations between media, comics are the main focus of this study. The symbolism present in the zombie, and the political and cultural ideas stemming from its slow maturation are revealed within The Walking Dead and sustained through the functions of the comics medium. Through the application of Scott McCloud’s comics theory, the closure between panels and the transition within the gutter enhance these ideas, and provide further understanding of the zombie as depicted in comics. The visual/textual relationship within comics is compared with Jacques Lacan’s modalities of consciousness, and the psychoanalytic reading provided here explores the crises of identity within the zombie, and within the fragmented narrative of the comics medium. Alternative psychoanalytic readings, and the physiology/pathology of the zombie itself are undertaken, revealing the creature to be responsive to Julia Kristeva’s concept of the abject, and Slavoj Zizek’s postmodern reworking of Lacanian ideas. The thesis also returns to notions of the Gothic, haunted spaces, and the role of suburbia in the zombie narrative. This is augmented with a study of intertextuality and the “revenant” status of the zombie, and of comics. Through incorporating the critical theory of Kristeva, Mikhail Bakhtin, and Jacques Derrida, and by positioning in parallel comics theorist Thierry Groensteen’s concepts of braiding and arthrology, I emphasise the operations of the zombie figure in the comic book, and other media, asserting that the zombie is a revenant signifier continually returning and transforming, never resting, but endlessly cannibalising and reconstructing debate about identity, morality, and society.

La migration latérale est reconnue comme un processus majeur à préserver pour le bon fonctionnement des écosystèmes aquatiques. Ce travail explore sa variabilité spatiale dans le Sud-Est de la France en appui à la mise en œuvre de la Directive Cadre sur l’Eau.Une première partie développe un cadre méthodologique et des outils géomatiques pour la caractérisation géomorphologique et l’analyse multi-scalaire des systèmes fluviaux à partir de données disponibles à large échelle. Un premier article présente la démarche générale basée sur l’agrégation et la désagrégation spatiale d’objets vectoriels. Un second article aborde spécifiquement le problème de l’agrégation spatiale et vise à comparer des techniques statistiques pour la sectorisation d’un continuum en tronçons homogènes. Des exemples illustrent l’intérêt et les limites des outils développés.Une seconde partie porte sur la régionalisation de la dynamique latérale des lits fluviaux. Un troisième article caractérise et modélise son intensité à partir de variables simples à extraire à l'échelle régionale. Il montre qu’elle est structurée spatialement et positivement corrélée à la puissance fluviale. Néanmoins, des limites inhérentes à la modélisation empirique et la nécessaire prise en compte de variables complémentaires à l’échelle régionale émergent (apport sédimentaire notamment). Un quatrième article porte spécifiquement sur les lits à tresses et montre que près de la moitié des 1200 kilomètres recensés avant la construction des grandes infrastructures ont disparu du fait de pressions anthropiques directes et indirectes. Il révèle par ailleurs la grande diversité géomorphologique de ce style fluvial dans le bassin rhodanien. / The channel migration is a key process for preserving the aquatic ecosystem functioning. This work explores its spatial variability throughout the South-East French hydrographic network for the implementation of the European Water Framework Directive.A first part develops a methodological framework and geomatic tools for the characterization and analysis of the fluvial systems for a range of scales from spatially continuous data available at the large scale. A first paper introduces the methodological framework based on the spatial disaggregation and aggregation of geographical objects. A second paper focuses specifically on the aggregating problem and aims to compare statistical techniques for delineating homogeneous reaches along a continuum. Examples illustrate the potentialities and limits of the tools we developed. A second part focuses on the regionalization of the channel migration. A third paper characterizes and models the migration rates from simple variables that can be extracted at the large scale. We show that the migration rate is spatially organized and positively controlled by the gross stream power. Nevertheless, limits of the regional-scale empirical modeling emerge, as well as additional variables that should be integrated (particularly the sediment supply). A fourth paper focuses specifically on braided rivers and shows that near the half of the 1200 kilometers censed prior to the major infrastructure construction disappeared due to direct and indirect human impacts. It also reveals the high geomorphic diversity of the contemporary braided rivers in the Rhône basin.

The high specific strength and stiffness characteristics of composite materials such as carbon fiber-reinforced plastic (CFRP) allow a significant weight reduction of the structural machine components such as automobile driveshafts. But high material cost and rather low productivity of the established manufacturing processes (e.g., filament winding) often inhibit the use of CFRP components in a high-volume car series. In this paper, a novel composite driveshaft system based on a profiled CFRP tube is presented. This system is designed to be produced by a continuous pultrusion process to achieve a significant reduction of the manufacturing costs. A cost assessment study was conducted to quantify the benefit of the developed continuous manufacturing process. In comparison with the state-of-the-art filament winding process, a cost reduction of 36% for the composite shaft body can be obtained. Moreover, the proposed fiber layup processes – braiding and continuous winding – offer the potential to manipulate the reinforcement architecture to maximize material utilization without reducing the manufacturing efficiency. This potential is investigated and validated by experimental tests. A difference in the load bearing capacity of more than 100% between different reinforcing architectures is shown.

To prevent the renewed rupture of ligaments and tendons prior to the completed healing process, which frequently occurs in treated ruptured tendons, a temporary support structure is envisaged. The limitations of current grafts have motivated the investigation of tissue-engineered ligament replacements based on the braiding technology. This technology offers a wide range of flexibility and adjustable geometrical and structural parameters. The presented work demonstrates the possible range for tailoring the mechanical properties of polyester braids and a variation of the braiding process parameters. A finite element simulation model of the braiding process was developed, which allows the optimization of production parameters without the performance of further experimental trials. In a second modelling and simulation step, mechanical properties of the braided structures were virtually determined and compared with actual tests. The digital element approach was used for the yarns in the numerical model. The results show very good agreement for the process model in terms of braiding angles and good agreement for the structural model in terms of force-strain behaviour. With a few adaptions, the models can, thus, be applied to actual ligament replacements made of resorbable polymers.