Search results for "systèmes"
showing 10 items of 112 documents
Integrable systems and moduli spaces of curves
2016
This document has the purpose of presenting in an organic way my research on integrable systems originating from the geometry of moduli spaces of curves, with applications to Gromov-Witten theory and mirror symmetry. The text contains a short introduction to the main ideas and prerequisites of the subject from geometry and mathematical physics, followed by a synthetic review of some of my papers (listed below) starting from my PhD thesis (October 2008), and with some open questions and future developements. My results include: • the triple mirror symmetry among P 1-orbifolds with positive Euler characteristic , the Landau-Ginzburg model with superpotential −xyz + x p + y q + z r with 1 p + …
Les territoires urbains polycentriques en Europe : de l'organisation économique à la gouvernance
2006
La présente recherche a pour objectif d'étudier les nouvelles centralités au sein des territoires urbains en Europe, de mener une analyse comparative des modalités d'organisation économique et institutionnelle de ces territoires afin d'en dégager des orientations de recherches prospectives sur l'interface : Europe Polycentrique – Recomposition des centralités - Gouvernance urbaine. Cinq pays sont privilégiés : l'Allemagne, l'Espagne, la France, la Grande-Bretagne et l'Italie. Trois grilles d'analyse sont utilisées pour synthétiser les recherches : 1/ la forme "intra" ou "inter" urbaine des polarités économiques 2/ Les caractéristiques fonctionnelles des polarités 3/ les modes de gouvernance…
La dynamique des systèmes selon J.W. Forrester
2006
National audience; Cet article présente la dynamique des systèmes. Dans le cadre de la théorie générale des systèmes de L. von Bertalanffy, la dynamique des systèmes de J.W. Forrester s'intéresse à la façon dont se produisent les changements à l'intérieur des systèmes étudiés. C'est une méthode de modélisation apparue dans les années 60, lorsque J.W. Forrester était professeur à la "Sloan School of Management" du MIT et développée en France à partir de 1980, lors de la traduction en français de son livre intitulé « Principes des Systèmes ». Les modèles permettant d'appréhender la dynamique d'un système se fondent sur les concepts d'interaction, de rétroaction et de complexité.
La communication : en long, en large mais surtout en travers
2016
International audience; Dans le cycle de conférences autour de « la communication, un enjeu citoyen », ma démarche est sans doute particulière puisqu'elle vise tout particulièrement l'enseignement de la communication. Et pourtant, il nous semble que cet enseignement participe pleinement à la notion de citoyen responsable. Une communication sur la communication. Voilà ce que le titre évoque. Mais si le titre de ce texte fait place à la communication, il se veut équivoque. En effet, l'expression « en travers » prête à commentaire. Aussi, précisons que celle-ci désigne la transversalité de la discipline et de son enseignement. Communication ! Le mot à lui tout seul laisse rêveur, tant il est u…
Agroecological engineering
2015
Earth has recently entered the new era of the Anthropocene, during which the rise of human activities are impacting for the first time ecosystems and climate on the global scale. Since the 1960s the green revolution has improved food production in quantity using industrially-designed agriculture, which has led to global pollution by pesticides and losses of food quality, biodiversity and soil carbon. As a consequence there is a need to implement agroecological practices in order to produce food safely and in a sustainable way. This virtual issue presents principles and applications of agroecological engineering, exemplified in 19 selected review articles from the journal Agronomy for Sustai…
Instanton Counting, Quantum Geometry and Algebra
2020
The aim of this memoir for "Habilitation \`a Diriger des Recherches" is to present quantum geometric and algebraic aspects of supersymmetric gauge theory, which emerge from non-perturbative nature of the vacuum structure induced by instantons. We start with a brief summary of the equivariant localization of the instanton moduli space, and show how to obtain the instanton partition function and its generalization to quiver gauge theory and supergroup gauge theory in three ways: the equivariant index formula, the contour integral formula, and the combinatorial formula. We then explore the geometric description of $\mathcal{N} = 2$ gauge theory based on Seiberg-Witten geometry together with it…
A multilight approach for documenting and modeling the appearance of large cultural heritage objects
2022
In recent years, Computer Vision has played a major role in the investigation of sur-face appearance, particularly with the introduction of image-based rendering algorithms. Reflectance transformation Imaging (RTI) is one of these approaches. The RTI is a multi-light imaging technique that involves taking a series of images of an item using a stationary camera, while the location of the incident light varies in each photograph. Thanks to the information gathered from this type of acquisition, which is also defined as a Multi-light Image Collection (MLIC), it is possible to model the angular reflectance of a surface. The RTI is frequently employed in the documentation and study of architectu…
Which food for whom?
2015
From lack of food to food excess there are numerous different forms of malnutrition, caused by many determining factors. Improving the nutritional condition of populations therefore is a key task of public health care on a planetary level. It is also an economic challenge. The development of an agro-industrial system over the last sixty years has no doubt contributed to make foods safer, but it has also contributed to the consumption of products which are too fat and too sweet. As a consequence the innovation of healthier foods that are affordable has now become an important challenge. This challenge requires developing a new food engineering approach, notably improving the understanding of…
La convergence des systèmes nationaux de gouvernance: une perspective contingente
2009
The objective of this paper is to show that the answer to the question of convergence of national systems of governance is contingent on a number of assumptions. The first assumption bears on the functions and the formal mechanisms characterizing the systems of governance. The second concerns the possibility to define a unique national system of governance for all the firms of a nation. The third focuses on the process of homogenization of national systems of governance attributed to globalization.