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The Global ETD Search service is a free service for researchers
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Showing 71 to 73 of 73 (0.021 seconds)Spelling suggestions: "subject:"sinai"" "subject:"einai""
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Géométrie et dynamique des espaces de configuration / Geometry and dynamics of configuration spacesKourganoff, Mickaël 04 December 2015 (has links)
Cette thèse est divisée en trois parties. Dans la première, on étudie des systèmes articulés (mécanismes formés de tiges rigides) dont l'espace ambiant n'est pas le plan, mais diverses variétés riemanniennes. On étudie la question de l'universalité des mécanismes : cette notion correspond à l'idée que toute courbe serait tracée par un sommet d'un mécanisme, et que toute variété différentiable serait l'espace de configuration d'un mécanisme. On étend les théorèmes d'universalité au plan de Minkowski, au plan hyperbolique et enfin à la sphère.Toute surface dans R^3 peut être aplatie selon l'axe des z, et la surface aplatie s'approche d'une table de billard dans R^2. Dans la seconde partie, on montre que, sous certaines hypothèses, le flot géodésique de la surface converge localement uniformément vers le flot de billard. De plus, si le billard est dispersif, les propriétés chaotiques du billard remontent au flot géodésique : on montre qu'il est alors Anosov. En appliquant ce résultat à la théorie des systèmes articulés, on obtient un nouvel exemple de systèmes articulé Anosov, comportant cinq tiges.Dans la troisième partie, on s'intéresse aux variétés munies de connexions localement métriques, c'est-à-dire de connexions qui sont localement des connexions de Levi-Civita de métriques riemanniennes ; on donne dans ce cadre un analogue du théorème de décomposition de De Rham, qui s'applique habituellement aux variétés riemanniennes. Dans le cas où une telle connexion préserve une structure conforme, on montre que cette décomposition comporte au plus deux facteurs ; de plus, lorsqu'il y a exactement deux facteurs, l'un des deux est l'espace euclidien R^q. La démonstration des résultats de cette partie passe par l'étude des feuilletages munis d'une structure de similitude transverse. Sur ces feuilletages, on montre un résultat de rigidité qui peut être vu indépendamment des autres: ils sont soit transversalement plats, soit transversalement riemanniens. / This thesis is divided into three parts. In the first part, we study linkages (mechanisms made of rigid rods) whose ambiant space is no longer the plane, but various Riemannian manifolds. We study the question of the universality of linkages: this notion corresponds to the idea that every curve would be traced out by a vertex of some linkage, and that any differentiable manifold would be the configuration space of some linkage. We extend universality theorems to the Minkowski plane, the hyperbolic plane, and finally the sphere.Any surface in R^3 can be flattened with respect to the z-axis, and the flattened surface gets close to a billiard table in R^2. In the second part, we show that, under some hypotheses, the geodesic flow of the surface converges locally uniformly to the billiard flow. Moreover, if the billiard is dispersing, the chaotic properties of the billiard also apply to the geodesic flow: we show that it is Anosov in this case. By applying this result to the theory of linkages, we obtain a new example of Anosov linkage, made of five rods.In the third part, we first consider manifolds with locally metric connections, that is, connections which are locally Levi-Civita connections of Riemannian metrics; we give in this framework an analog of De Rham's decomposition theorem, which usually applies to Riemannian manifolds. In the case such a connection also preserves a conformal structure, we show that this decomposition has at most two factors; moreover, when there are exactly two factors, one of them is the Euclidean space R^q. The proofs of the results of this part use foliations with transverse similarity structures. On these foliations, we give a rigidity theorem of independant interest: they are either transversally flat, or transversally Riemannian.
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Sovereignty, Peacekeeping, and the United Nations Emergency Force (UNEF), Suez 1956-1967: Insiders’ PerspectivesHilmy, Hanny 13 February 2015 (has links)
This research is concerned with the complex and contested relationship between the sovereign prerogatives of states and the international imperative of defusing world conflicts. Due to its historical setting following World War Two, the national vs. international staking of claims was framed within the escalating imperial-nationalist confrontation and the impending “end of empire”, both of which were significantly influenced by the role Israel played in this saga. The research looks at the issue of “decolonization” and the anti-colonial struggle waged under the leadership of Egypt’s President Nasser. The Suez War is analyzed as the historical event that signaled the beginning of the final chapter in the domination of the European empires in the Middle East (sub-Saharan decolonization followed beginning in the early 1960s), and the emergence of the United States as the new major Western power in the Middle East.
The Suez experience highlighted a stubborn contest between the defenders of the concept of “sovereign consent” and the advocates of “International intervention”. Both the deployment of the United Nations Emergency Force (UNEF) and its termination were surrounded by controversy and legal-political wrangling. The role of UNEF and UN peacekeeping operations in general framed the development of a new concept for an emerging international human rights law and crisis management. The UNEF experience, moreover, brought into sharp relief the need for a conflict resolution component for any peace operation. International conflict management, and human rights protection are both subject to an increasing interventionist international legal regime. Consequently, the traditional concept of “sovereignty” is facing increasing challenge.
By its very nature, the subject matter of this multi-dimensional research involves historical, political and international legal aspects shaping the research’s content and conclusions. The research utilizes the experience and contributions of several key participants in this pioneering peacekeeping experience. In the last chapter, recommendations are made –based on all the elements covered in the research- to suggest contributions to the evolving UN ground rules for international crisis intervention and management. / Graduate / hilmyh@uvic.ca
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The role of the priests in Israelite identity formation in the exilic/post-exilic period with special reference to Leviticus 19:1-19a / Rol van die priesters in die Israelitiese identiteitsvorming tydens die ballingskaps-/ na-ballingskapstydperk met spesiale verwysing na Levitikus 19:1-19aBeer, Leilani 07 1900 (has links)
Bibliography: leaves 289-298 / Source-criticism of the Pentateuch suggests that the priests (Source P) alone authored the
Holiness Code – the premise being that Source P forms one religious, literate and elite group
of several. Through the endeavor to redefine Israelite identity during the Neo-Babylonian
Empire of 626–539 BCE and the Achaemenid Persian Empire of 550–330 BCE, various
ideologies of Israelite identity were produced by various religious, literate and elite groups.
Possibly, the Holiness Code functions as the compromise reached between two such groups,
these being: the Shaphanites, and the Zadokites. Moreover, the Holiness Code functions as
the basis for the agreed identity of Israel as seen by the Shaphanites and the Zadokites.
Specifically, in Leviticus 19:1-19a – as being the Levitical decalogue of the Holiness Code,
and which forms the emphasis of this thesis – both Shaphanite and Zadokite ideologies are
expressed therein.
The Shaphanite ideology is expressed through the Mosaic tradition: i.e., through the Law;
and the Zadokite ideology is expressed through the Aaronide tradition: i.e., through the Cult.
In the debate between the supremacy of the Law, or the Cult – i.e., Moses or Aaron – the
ancient Near Eastern convention of the ‘rivalry between brothers’ is masterfully negotiated
in Leviticus 19:1-19a. / Old Testament and Ancient Near Eastern Studies / D. Phil. (Old Testament)
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