La diversité des régimes des instruments de la famille des flûtes a été mise en évidence à de nombreuses reprises : régimes statiques, périodiques, ou non périodiques. Cependant, de nombreux aspects de la dynamique de ces instruments demeurent mal compris. Pour les musiciens comme pour les facteurs d'instruments, les transitions entre régimes revêtent une importance particulière : d'une part elles correspondent à des changements de notes, et d'autre part la production d'un régime donné est conditionnée par les paramètres de facture (liés à la fabrication de l'instrument), et de contrôle (ajustés en permanence par l'instrumentiste). On s'attache dans ce document à caractériser les transitions entre régimes dans les flûtes, en lien avec des problématiques de facture et de jeu. Différentes approches sont mises en place. Des approches expérimentales d'une part, avec des mesures sur musicien et sur bouche artificielle. Par ailleurs, un modèle physique de l'instrument - un système dynamique à retard de type neutre - est étudié, par intégration temporelle d'une part, mais également par collocation orthogonale et continuation, donnant ainsi accès aux diagrammes de bifurcations.Croiser les résultats de ces différentes approches permet de mieux appréhender différents phénomènes : hystérésis associée aux changements de régime, ou mécanisme d'apparition des régimes non périodiques. L'influence de paramètres de facture et de contrôle est également étudiée : le rôle majeur de la géométrie interne du canal des flûtes à bec est mis en évidence, et l'influence de la dynamique de la pression dans la bouche du musicien sur les seuils de changement de régimes est caractérisée. / Various studies have highlighted the diversity of regimes in flute-like instruments : static, periodic or non periodic regimes. However, some aspects of their dynamics remain poorly understood. Both for flute players and makers, transitions between regimes are particularly important : on the one hand, they correspond to a change of the note played, and on the other hand, production of a given regime is determined by parameters related to making and to playing of the instrument. In this document, we are interested in caracteristics of regime change in flute-like instruments, in relation with making and playing issues.Different approches are considered. First, experimental methods, with measurement on both musician and an artificial mouth. On the other hand, a physical model of the instrument - a system of delay differential equations of neutral type - is studied, through time-domain integration, and using orthogonal collocation coupled to numerical continuation. This last approach provides access to bifurcation diagrams.Considering results of these different methods, it becomes possible to better understand different experimental phenomena, such as regime change and associated hysteresis, or production mechanisms of non periodic regimes. Influence of different parameters is further studied : the crucial importance of the channel geometry in recorders is highlighted, and the influence of the mouth pressure dynamics on regime change thresholds is analysed.

The aim of this work is to analyze the relationship between R2P and violent regime change. The work gives an overview of the establishment of R2P on the international scene, and then deals with its problem of selectivity in its application in practice. Despite the formal adoption of R2P in 2005 by all UN member states, R2P has been since then applied to similar cases of humanitarian crises in different ways. The problem of selectivity of R2P is fuelling the criticism of its legitimacy, because it is according to many a mean for achieving regime change. The most important reason for R2P's criticism is the connection between R2P and violent regime change, and that is the central theme of this work. Based on an analysis of the documents which form R2P, the work concludes that military intervention under R2P must not be deliberately used for regime change. However, there may be situations, when regime change is necessary for the protection of civilians; which means that regime change can be regarded as legitimate only if it is as an indirect result of the intervention. Therefore regime change is an integral part of R2P. The work aims to explore this ambivalent relationship and find out, where lies the boundary between legitimate overthrowing of a régime for the protection of civilians, and regime...

Le sujet central de cette thèse concerne les évolutions de la règle électorale dans les régimespost-communistes et traite de la contribution de ces évolutions à la démocratisation dessystèmes politiques de l’Europe du Sud-Est, à partir d’un échantillon d’Etats (Albanie,Bulgarie, Macédoine, Roumanie et Serbie-Monténégro). La transition démocratique et lechangement de régime impliquent la construction d’une nouvelle légitimité politique. Cettelégitimité passe par les élections qui sont au coeur de la démocratie. Ce travail cherche àcomprendre comment sont choisies les règles régissant ces élections. Le choix du systèmeélectoral est, dans une grande mesure, la conséquence de plusieurs processus. L’accent mis surles facteurs déterminants de l’adoption et de la réforme électorale permet de comprendre lesmotivations et les objectifs des évolutions de la règle électorale en Europe post-communiste.L’étude de la législation réformée et l’analyse du comportement des acteurs électorauxpermettent de constater que les leaders politiques ont très souvent contourné le sensdémocratique de la norme électorale. Dans cet échantillon d’Etats, les évolutions de la règleélectorale ont eu des conséquences relatives sur le nombre des partis politiques représentés auParlement. Le changement de régime a favorisé l’alternance des majorités électorales etparlementaires. Cette alternance démontre que les principes démocratiques des électionscontribuent à la stabilisation démocratique, même si le contexte et les enjeux politiques propresà cette région favorisent une relative instabilité des majorités parlementaires etgouvernementales. / The central subject of this thesis concerns the developments of the electoral rule in postcommunistregimes and discusses the contribution of these changes to the democratization ofpolitical systems of Southeast Europe, from a sample of states (Albania, Bulgaria, Macedonia,Romania and Serbia-Montenegro). Democratic transition and regime change involves theconstruction of a new political legitimacy. This legitimacy is through elections that are at theheart of democracy. This work seeks to understand how the rules are chosen these elections.The choice of electoral system is, to a large extent, the result of several processes. The focus onthe determinants of adoption and electoral reform to understanding the motivations and goalsof the developments of the electoral rule in post-communist Europe. The study of the reformedlegislation and behavior analysis of electoral allow players to see that the political leaders haveoften bypassed the democratic sense of the electoral standard. In this sample of countries,changes in the electoral rule had consequences on the number of political parties represented inParliament. Regime change has favored the alternation of parliamentary and electoralmajorities. This alternation shows that the democratic principles of elections contribute to thedemocratic stabilization, even if the context and the political stakes in this region favor a relativeinstability of parliamentary and government majority.

Der Sammelband behandelt die Verläufe, Ergebnisse und Perspektiven der Systemtransformationen im postkommunistischen Europa nach 25 Jahren. Dabei geht es um politische Institutionen wie Verfassungen und Wahlen, um die Prozesse der Demokratisierung, aber auch der Re-Autokratisierung in der Region und um ausgewählte Politikfelder wie die Bevölkerungsentwicklung in Osteuropa sowie die Sozial- und Außenpolitik. / The volume analyzes covers the courses, results and prospects of system transformations in post-communist Europe after 25 years. It is about political institutions such as constitutions and elections, about the processes of democratization, but also the Re-Autocratization in the region and about specific policies such as demographic, the social policy and foreign policy.

Der Sammelband behandelt ausgewählte Aspekte des Zusammenwachsens von Ost- und Westdeutschland 25 Jahre nach der Wiedervereinigung: Dominieren Gemeinsamkeiten oder Unterschiede das Verhältnis beider Landesteile zueinander? Neben Gesamtbilanzen zur Demokratieentwicklung und zur politischen Kultur stehen Politikfeldanalysen wie die Sozial-, Bildung- und Zuwanderungspolitik im Mittelpunkt. / The book analyzes selected aspects of the reunification of East and West Germany after 25 years: Dominate similarities or differences the relationship between the two parts of the country to each other? The volume focuses on overviews about the development of democracy and political culture as well as on social, education- and immigration policy.

This study examines the decision making process in Washington which led to the current non-existence of political and economic relations between the Islamic Republic of Iran and the United States. The study examines the U.S.-Iran relationship at three levels-of-analysis: the individual, state, and system levels. From a geopolitical perspective, Iran and the United States have often been natural allies that pursued similar policy goals. After 9/11, the U.S. entered Afghanistan and Iraq which further necessitated the reengagement of Tehran. Iranian regional clout would play a vital role in stabilization of Iraq and Afghanistan and without Iran's assistance; peace will not likely be realized in those states. Amongst the most compelling reasons for Washington to engage in meaningful dialogue with Tehran are: terrorism, the war on drugs, the Iranian sponsorship of militant groups, and Tehran's pursuit of a nuclear program. The study concludes that rapprochement should occur in two phases. The first being cooperation in areas of mutual concern such as the war on drugs. The second phase promoting confidence building methods, which would lead to a strategic partnership based on mutual interests.

Includes bibliographical references (leaves 135-150) / It is increasingly becoming apparent that elections, as component parts of democratic processes, do not always guarantee a smooth transfer of power and stable democratic cultures in many contemporary polities. Whenever election outcomes are disputed, Governments of National Unity (GNU) are presented as strategic conflict prevention and resolution models. Yet, the GNU’s ability to nurture democracy in situations where it remains weak or non-existent is extremely limited. This dissertation therefore uses Zimbabwe’s case study to examine how its recent internal political turmoil had overwhelming implications for its legitimacy and democracy. Through qualitative research, the study reveals that despite partially reconciling Zimbabwe’s political protagonists, the GNU neither permanently resolved the crisis nor addressed significant related issues; thus, creating a paradox of legitimacy for the country. The dissertation concludes with recommendations for further research on matters of legitimacy in power-sharing scenarios such as Zimbabwe’s. / Political Sciences / M.A. (International politics)