Search results for "Système"
showing 10 items of 558 documents
Les rôles dans les SCIT
2011
International audience
Human settlement dynamics and alluvial dynamics of the Rhine River during the Holocene: Geoarchaeology of the site of Oedenburg (Haut-Rhin, France).
2007
The relationship between alluvial dynamics and control parameters such as climate are well known and understood at plurimillennial and pluriannual time-scales. But it is not really the case at multicentennial and multidecennal time-scales compatible with human society settlement time-scales. In a present and near future context, when human settlement may be affected by strong climatic variation, alluvial dynamics understanding is however a major centre of attention to the development of efficient models. To approach this scale-related question, a segment of the Upper Rhine River presenting both anastomosed and braided was investigated. This area also gives us the opportunity to study settle…
Systèmes financiers et canaux de transmission de la politique monétaire
2010
This dissertation analyses the consequences of transformations in the financial sphere on the transmission channels of decisions in monetary policy in industrialized countries over the past several years. We observe that as a result of these transformations, banking institutions have evolved from an originate to hold model to an originate to distribute model. This has enabled banks to turn more toward derivative products and credit risk transfer instruments. We demonstrate that these techniques of active/passive management have completely revolutionized the theoretical foundations of traditional channels and in particular the credit channel. Our analysis of these landmark changes is organiz…
What is a tree in the Mediterranean Basin hotspot? A critical analysis
2019
Background: Tree species represent 20% of the vascular plant species worldwide and they play a crucial role in the global functioning of the biosphere. The Mediterranean Basin is one of the 36 world biodiversity hotspots, and it is estimated that forests covered 82% of the landscape before the first human impacts, thousands of years ago. However, the spatial distribution of the Mediterranean biodiversity is still imperfectly known, and a focus on tree species constitutes a key issue for understanding forest functioning and develop conservation strategies. Methods: We provide the first comprehensive checklist of all native tree taxa (species and subspecies) present in the Mediterranean-Europ…
Nouveaux enjeux pour l'école moyenne en Afrique
2005
05113; On constate aujourd'hui une augmentation massive de la scolarité des 12-16 ans dans les pays africains en développement. Ce phénomène est lié au développement voulu et obtenu des scolarités primaires.Pour diverses raisons, l'école moyenneconstitue un cycle terminal pour la grande majorité des enfants qui la fréquentent. Son organisation actuelle, telle qu'on peut l'observer dans différents pays, est cependant très proche du collège secondaire français et donc inapte à fournir le cadre adéquat pour un cycle terminal générateur de progrès économiques et sociaux.Bâti sur cette problématique de l'articulation entre les flux d'élèves, les contenus pédagogiques et les modalités d'organisat…
Évaluation longitudinale de l'expérience pédagogique du lycée Galatasaray
2014
En ligne sur http://www.cereq.fr/index.php/content/download/11326/93292/file/Relief48.pdf; National audience; Depuis 1868, fonctionne à Istanbul le Lycée Galatasaray, établissement francophone public de prestige créé en partenariat entre la France et la Turquie. En 1992, un accord bilatéral franco-turc décide la création de l'Etablissement public intégré Galatasaray, de droit public turc et comprenant une école primaire, rattachée au lycée, le lycée et des unités d'études supérieures. L'une des originalités est le recrutement de l'école primaire par tirage au sort. Les élèves rejoignent, à la fin de leurs études primaires et de collège, les élèves entrés au lycée Galatasaray par un concours…
Tangentes à une courbe fractale
2007
http://www.irit.fr/REFIG/index.php/refig/article/view/10; National audience; Nous nous intéressons au calcul des tangentes à une courbe fractale définie à l'aide d'un IFS. Généralement, les courbes fractales sont nulle part dérivables, mais sous certaines conditions on peut montrer qu'elles admettent, en un ensemble de points, des demi-tangentes à droite et à gauche. Nous proposons une méthode permettant de déterminer ces demi-tangentes.
Naturally constrained reduced form and stuctural parameters estimation
1988
To characterize such a situation, we introduce the concept of a "natural constraint", which is presented and discussed is section 1 of the present paper. Section 2 is concerned with the efficient estimation of the naturally constrained reduced form. From it, we derive efficient estimators of the structural parameters (by indirect GLS) and propose a simple test of the a priori restrictions. In section 3 we discuss estimation by 2SLS. In addition to the resultsobtained by Turkington and Pesaran, we develop a 2SLS-GLS estimator and assess its asymptotic properties. Several full information estimatorsof the 3SLS type are presented and compared in section 4 and some efficiency aspects of the ins…
INSTABILITY OF HAMILTONIAN SYSTEMS IN THE SENSE OF CHIRIKOV AND BIFURCATION IN A NON LINEAR EVOLUTION PROBLEM EMANATING FROM PHYSICS
2004
We prove the existence of a minimal geometrico-dynamical condition to create hyperbolicity in section in the vicinity of a transversal homoclinic partially hyperbolic torus in a near integrable Hamiltonian system with three degrees of freedom. We deduce in this context a generalization of the Easton's theorem of symbolic dynamics. Then we give the optimal estimation of the Arnold diffusion time along a transition chain in the initially hyperbolic Hamiltonian systems with three degrees of freedom with a surrounding chain of hyperbolic periodic orbits .In a second part, we describe geometrically a mechanism of diffusion studied by Chirikov in a near integrable Hamiltonian system with three de…
Laminations and tilings of the Hyperbolic upper half plane
2005
This thesis is devoted to the study of dynamical systems associated with tilings of theEuclidean plane or of the Hyperbolic half-plane. A such tiling codes an action of a group ofisometries (namely the group of translations of the plane or the group of affine maps) on a compactmetric space $\Omega$ such that the properties of this action are related with the combinatoricproperties of the tiling. The behaviors of the actions obtained by this way are really various. Insome cases, like for example for the Penrose's tiling, this action is free and minimal. This givesto the set $\Omega$ a structure of a specific lamination called {\it solenoid}. This space islocally the product of a Cantor set w…