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This thesis offers an account of dualist heresy in medieval Aquitaine. The first part asserts that the heresy referred to in early eleventh-century sources was dualist and originated in Balkan Bogomilism. It does this by combining two established methodologies. Through the first, reading the sources in their social context, it finds the poor experiencing increased poverty and oppression, and that some amongst the laity and clergy were observing signs prefiguring The End of historical time. Not unexpectedly, some responded through dissent and demanded reform and justice: a new system of values, in other words. Then the thesis adopts a comparative methodology in a 'global' context. It finds that the accounts of dissent do more than identify Apocalypticism or primitive communism. They make reference to dualist cosmology and practice. Dualists in the Balkans were intent on spreading their teaching world-wide, and this period saw increased contacts with the west. The spread of Bogomilism to Aquitaine was thus both likely and possible, and appears to have had some success. The second part of this thesis makes three contributions to the history of Catharism. First it suggests why twelfth-century Aquitaine was almost entirely untouched by the heresy except in the county of Agen. It points to actively Catholic lay authority and a relatively dynamic monasticism in Aquitaine, and finds these largely absent in the heretical Agenais. Second, it examines the Cathar diocese of Agen and the impact upon it of the Albigensian Crusade and the Medieval Inquisition. In this it argues that Agenais lay society was very diverse and divided, but notes close collaboration between its heretics and those of neighbouring Quercy. Third, it argues that a better understanding of aspects of the crusade can be gamed through its examination in the context of relations between the dukes of Aquitaine - who were also kings of England - and the counts of Toulouse, the kings of France and the Papacy.

This thesis proposes a novel consolidated approach for substantial compaction of HVDC lines that includes both new tower geometries as well as novel control concepts. This is based on a thorough discussion on the basic overhead line design parameters and their impact on the right of way width and tower height. Then the electrical aspects of the new approach such as dc overvoltage assessment and lightning performance are investigated. The required horizontal clearances between pole conductors and tower members, as a component of the right of way width, depend on the maximum expected overvoltages. Detailed electromagnetic transient models for the point to point MMC HVDC with different transmission configurations, all including the proposed dc overhead line, are developed for this thesis. The models are used to assess fault contingencies that result in the most significant overvoltage stresses on the HVDC transmission line for finding minimum air clearances and for the design of overvoltage limiting devices, such as surge arresters. New control approaches are proposed that significantly reduce the dc side overvoltage and consequently minimize the required air clearances for maximum compaction of the HVDC overhead lines and also reduce the required surge arrester size for line insulation. Because power transmission lines are the most exposed component within a power system, they are subject to lightning strikes which, in turn, are the main cause of disruption to power flows. This thesis will include an analysis of lightning occurrence on the proposed compact transmission line in order to assess the risk of pole faults. The focus of this analysis is mainly on evaluation of the critical lightning currents that cause fast front overvoltage stresses that may result in insulation failure. / May 2017

Dans l’objectif d’une augmentation en puissance des piles à combustible pour satisfaire les besoins énergétiques des applications embarquées, une solution consiste à augmenter la taille des assemblages. Dès lors, des problèmes de disparités fluidique, thermique et électrique peuvent survenir dans le cœur des piles et conduire ainsi à l’apparition de défaut. La pile à combustible, de par sa nature de source électrique basse tension – fort courant, requiert d’être couplée au réseau électrique embarqué par l’intermédiaire d’un convertisseur statique. Ce dernier peut alors être employé pour agir de façon corrective sur la pile et aussi de corriger les défaillances qui en sont liées. Dans cette perspective, le convertisseur doit avoir en permanence un retour sur l’état de santé de la pile. Pour cela, une méthode de détection et d'identification de défaut de type noyage et d’assèchement pour une pile du type PEMFC a été approfondie. Cette méthode simple, économique en capteurs, se base sur la mesure de 3 tensions de cellule judicieusement sélectionnées et localisées sur la pile. Ainsi, l’utilisation de l’information « spatiale », qui correspond à la position de la mesure de tension dans la pile permet d’identifier les défauts. Le principe de la détection localisée nous amène alors à considérer le concept de pile segmentée qui consiste à séparer électriquement la pile en 3 parties de façon à ce que des convertisseurs associés puissent agir électriquement sur chaque segment. L’action peut être du type tout ou rien, ou contrôlée. Cette dernière offre davantage de degrés de liberté, et est moins contraignante pour la pile d’un point de vue électrique. Pour choisir comment réaliser cette action, une étude comparative de plusieurs topologies de convertisseur est effectuée. Les structures alimentées en courant répondent au mieux aux contraintes électriques d’une PEMFC et sont donc privilégiées, de même que la nécessité d’une isolation galvanique imposée par la segmentation de la pile. Au final, une topologie de BOOST isolé résonant est apparue comme étant la topologie répondant au mieux à l’ensemble des critères (plage de fonctionnement, performances énergétiques, nombre de composants). L’ensemble convertisseur global intègre ainsi trois structures unitaires qui permettent d'offrir une modularité, une action indépendante sur chaque segment et de garantir une disponibilité du système grâce à un fonctionnement dégradé. Pour cela, la stratégie de commande de l’ensemble convertisseur intègre les informations issues de la méthode de détection. La thèse se termine avec le dimensionnement complet d’un pré-prototype du convertisseur avec le choix des composants actif et passifs, et du système de refroidissement associé. / In the objective of fuel cell power increase in order to satisfy energetic requirements for embedded applications, a solution consists in increasing the size of fuel cell stack assemblies. As possible consequence, fluidic or thermal disparity problems may occur in the fuel cell core and lead to the appearance of faults. The fuel cell, which is a low voltage-high current electrical source, needs to be connected to the on-board electrical network thanks to a static converter. This latter can be used in order to perform a corrective action in the aim of reducing disparities in the stack and also correcting resulting faults. In this perspective, the converter should permanently get information about fuel cell state of health. Hence, a fault detection and identification method for PEMFC has been explored. This method which is simple and requires only few sensors is based on 3 voltage measurements judiciously selected and localized over the stack. Using “spatial” information which corresponds to the position of the sensors, allows to identify some characteristic faults. The principle of the localized fault detection leads to consider the segmentation concept for the fuel cell, which in our case is electrically split into three parts and allows an independent control of each segment by the power converter. Electrical action can be “all or nothing” or moderated ones. The latter offers more degree of freedom, and is less constraining from an electrical point of view. In order to execute the action, study of multiple power converter topologies have been done. Among the candidate topologies, current structures are preferred, as well as the necessity of a galvanic isolation required by the segmentation concept. The resonant isolated boost is the adopted structure; as it meets at best the whole criteria. Thus the global converter assembly is composed of three single structures which offer modularity, independent action on each segment, and continuity of service thanks to degraded modes. The detection method is hence implemented in the converter control strategy. This Ph.D. thesis ends with the complete sizing of a power converter pre-prototype together with technological choices for the active, passive and associated cooling components.

At different times between 1545 and 1642, the navies of England and France both grew in strength and declined. This thesis traces the advances and regression of both kingdoms’ sea forces and relates these changes to concurrent developments within the state. As a comparative study, it shows that, in sharing the Channel and with an increasing use of the early modern maritime theatre, English and French naval expansion was intertwined. First, approaching the administrative transformations of both navies and, then, progressing to discuss fiscal, technological, maritime and finally aesthetic developments, this thesis highlights the relationship between naval and state strength in early modern Europe. As a comparative study of early modern state and naval development, this project has been particularly inspired by the research of Jan Glete. Consequently, through quantitative statistical analysis and other techniques, it accounts for naval and state growth. It uses a large source base of archival evidence from national and regional archives in England and France, printed documentation, and resources from museums and art galleries. As well as engaging with the military revolution debate, where it is argued that early modern naval developments justly deserve greater prominence, the thesis also produces a framework that accounts for the rise and decline of naval strength. It suggests that three principal factors can account for these developments in early modern Europe. First, naval strength was reliant upon the will, enthusiasm and political stability of the monarch. Second, transnational influence and engagement helped to shape the size and appearance of state fleets. The English Channel was an international theatre of political and cultural exchange that facilitated English and French advances. Finally, the geography of both kingdoms is explored, because the size, composition, visual design and location of state navies were conditioned by it.

This thesis will present a comparative and internationally contextualised history of Anglo-French relations in Japan between 1858 and 1868. It will introduce the concept of ‘enclave empires’ to describe the conduits for Western informal imperialism that were created in Japan by the imposition of the treaty-port system in 1858. It will aim to address longstanding gaps in the historiography by assessing that system as a multinational construct that depended upon the cooperation and collaboration of each treaty power operating within it. At the same time, it will show how the management of the Japanese treaty-port system was increasingly dominated by the British Empire and the French Second Empire, the two most powerful Western trading nations in Japan during the 1860s. It will examine how global contexts impacted upon British and French foreign policymaking during this period, and how this catalysed an increasingly bitter AngloFrench struggle for control over the ‘enclave empires’ in Japan. It will also seek to broaden the scope of the historiography beyond the sphere of diplomatic relations by considering the perspectives of prominent non-diplomatic British and French actors whenever relevant. Finally, it will address significant historiographical oversights in the use of relevant primary source material through the critical appraisal of contemporary private paper collections. By adopting this four-pronged methodological approach, this thesis will demonstrate that Anglo-French relations fundamentally defined the process of creating and developing informal ‘enclave empires’ in Japan in the decade between the conclusion of the ‘unequal treaties’ in 1858 and the Meiji Restoration in 1868.

In 2011, the Performance and Theatre Collection at the Victoria and Albert Museum in London acquired an archive of materials relating to the French prisoners of war held at Portchester Castle from 1810 to 1814. This archive consisted of scripts, playbills, and abstracts from the prisoners’ Théâtre des Variétés built and operated in the basement of the castle’s keep. These materials have provided new and unique insights into the experiences of Napoleonic prisoners of war and have served as a catalyst for this first major critical study of Napoleonic prisoners-of-war theatricals. The majority of the theatre’s sociétaires were captured in the French defeat at the Battle of Bailen in July 1808. This study will be charting the journey of these French prisoners through their captivity in Spain, the Baeleric Islands, and Britain. While this particular group of prisoners has been the subject of previous historic surveys, their theatrical endeavours have been sidelined or relegated to footnotes or dismissed as a way to pass the time. In this study I will draw the prisoners’ theatricals to the centre of critical discussion examining their repertoire in greater detail underlining the vital role that theatre served in the prisoners’ emotional and psychological survival in captivity.

The object of this thesis is to investigate the performance in detail and to improve the efficiency of an exterior-rotor burshless DC motor provided by a motor manufacturing company. The finite element software package FLUX3D will be adopted to conduct all the analyzing works. At first, the three-dimensional static magnetic model of the machine will be formulated by FLUX3D. After confirming the preliminary analyzing results with practical measurements, static magnetic circuit of the machine system will be established to seek the possible flux leakage paths. By adjusting the thickness of permanent magnets and the shapes of stator poles, the effectiveness of machine operational efficiency improvements as well as induced torque changes will be obtained. Finally, from these investigations, adequate suggestions for design and construct the associate machine will be provided.

The TI TMS320LF2407A DSP is used as the control kernel in this thesis, proposing a method of sensorless control for the brushless DC motor. With six-step pulse-width modulation, the information of the back electromagnetic signals can be detected and is used to estimate the rotor position instead of the Hall sensors. To strengthen the system and reduce the power consumption, we propose the idea of close loop framework, including speed feedback and current feedback. Then, the phase-change signal is set as no delayed, 15 degree delayed, and 30 degree delayed and compare the results each other. Finally, setting up experimental framework, to verify the superiority of sensorless drivers with close-loop framework, and choosing better phase-change degree to improve system and efficiency.

Between 1934 and 1936 various organisations of the French left joined forces to create the Popular Front, an alliance borne of an antifascist imperative. After winning the May 1936 legislative elections, and in a climate of growing opposition from conservative and far right forces, the left-wing coalition came to power. By the end of 1938, the Popular Front had collapsed and the right was back in power. During this period (1934-1938), the right and far right repeatedly challenged the left-wing alliance‟s legitimacy and attacked its constituent political parties. This conflict between left and right intensified France‟s political and social tensions and polarised French politics and French society into supporters and opponents of the Popular Front. This thesis examines the role of the right within the context of the Popular Front and seeks to answer the following question: how did the right act in response to the Popular Front between 1934 and 1938? The thesis focuses on the Moselle, a border département returned to French sovereignty after forty-seven years under German domination (1871-1918). By 1934, the Moselle had developed a distinctive political character sympathetic to the right and hostile, or at best indifferent, to the left. By drawing parallels between Parisian and Mosellan events and using new archival material, the thesis demonstrates the originality of the Popular Front in the Moselle, and the responses of the local, and essentially Catholic and particularist, right. No scholarly work has yet examined the conflict between the right and the left within the context of the Popular Front in the Moselle. This thesis demonstrates how the département's distinctive historical, social, linguistic, cultural, political and religious context shaped the Popular Front and the right‟s responses to it.