Search results for "Méthode"
showing 10 items of 189 documents
Unified mapping of the dynamics of solitons in fiber-optic waveguides
2013
This thesis examines the dynamical behaviour of solitons which are affected, when entering a fiber-optic waveguide, by a slight distortion of profile as compared to the stationary profile in the guide. Our theoretical model combines the propagation equation of the electric field (Non-Linear Schrödinger Equation) and the system of equations of evolution of the physical parameters of the pulse (derived from the collective coordinates theory). We establish a general mapping which reveals an unsuspected diversity of dynamic behaviour around the stationary state of the pulse, in relation with the initial perturbation of the pulse's profile. This mapping establishes a classification of solitons i…
Application of the collective coordinate method to the analysis of the dynamics of mode-locked fiber lasers
2015
Mode-locked fiber laser are among the few systems that allow to achieve a variety of elaborate optical functions, by means of few optical components. The use of dispersion management brings to this type of lasers a variety of behaviors, which is so rich that the complete mapping and detailed analysis of the stable states becomes impractical when conventional tools based on the intra-cavity field propagation equations, are used. In this thesis we show that the addition of the technique ofcollective coordinates to the conventional theoretical tools, allows to solve at least in part the problem of complexity and diversity of the stable states of the cavity. In particular, we propose the DCCA (…
3D digitization of transparent objects by polalization techniques in IR & by triangulation in UV
2011
Two non-conventional methods for the 3D digitization of transparent objects via non-contact measurement are reported in this thesis. 3D digitization is a well acknowledged technique for opaque objects and various commercial solutions based on different measurement approaches are available in the market offering different types of resolution at different prices. Since these techniques require a diffused or lambertian surface, their application to transparent surfaces fails. Indeed, rays reflected by the transparent surface are perturbed by diverse inter-reflections induced by the refractive properties of the object. Therefore, in industrial applications like quality control, the transparent …
Le manuel Corso di Lingua francese a base intuitiva de Romeo Lovera
2020
We analyze the three volumes of Romeo Lovera’s manual, Corso di Lingua francese a base intuitiva, which were intended for teaching French in secondary schools. The manual was first published in 1902 in Venice by Libreria editrice del Bollettino di Filologia Moderna, and there will be many reissues. Romeo Lovera is Italy's biggest supporter of methodological reform in the teaching of foreign languages ; it discloses, through the Bollettino di Filologia Moderna, new theories, scientific methods and their didactic applications. In their manuals, from the first lesson, through the direct and indirect intuition of the foreign language, the student learns to speak the French language by studying …
Use the artificial Intelligent in order to Define Skills in Higher Education
2012
In order to increase the level of learning and the rate of success of students the educational policy tries to find a way to increase simultaneously the skills and the knowledge of students especially in higher education. Many approaches have aimed to find the solutions. To reach this goal normally the combination of the various sciences can be more effective than one branch. Then we interested to know how the other science can help us to be close to this goal. The artificial intelligence (AI) is a branch of science that has a very wide domain of using. It can help us in various sciences like electronic, animation, medicine, banking, industries, exploitation, robotic, security and even spea…
La conférence du Columa 2013 racontée par des étudiants AgroSup-Dijon
2014
Document accessible depuis la notice de ProdInra : https://prodinra.inra.fr/?locale=en#!ConsultNotice:306111; La 22e conférence du Columa de l’AFPP, tenue à Dijon du 11 au 13 décembre 2013, a été suivie par des étudiants d’AgroSup-Dijon. Ils rendent compte ici de ce qu’ils en ont retenu. Ils analysent particulièrement les sessions : – « Nuisibilité » des adventices (indirecte, ex. : favoriser l’ergot, et directe). – « Cultures méditerranéennes et tropicales » (différences Dom-Tom/autres pays, techniques émergentes). – « Résistance » (extension, mécanismes, facteurs de risque). – « Transfert aux milieux » (facteurs de risque de pollution des eaux, suivis et modélisation pour les prévoir). – …
How Do French Junior Secondary Schools Operate ? Academic Achievement, Grading and Streaming of Students
1989
International audience; This paper is concerned with the operation of Junior Secondary Schools in France. Students' school careers have been analysed in three sequential and cumulative components: student progress in learning in the junior secondary school, student grading by teachers, and student streaming, i.e., admission, or not, into a general form 3. For each of the three mechanisms described above, the authors examine whether they are influenced by the schooling context, which schooling context (school and/or classroom), and which characteristics of those contexts it is relevant to consider. Finally, they focus on the process by which the large social inequalities visible after the pu…
Analyse du rôle des TIC dans les méthodes pédagogiques mobilisées par les enseignants universitaires
2018
International audience; En France, le numérique est actuellement perçu comme un levier pouvant contribuer à la rénovation des pratiques d'enseignement à l'université (Bertrand, 2014; Djebara et Dubrac, 2015; Le Déaut, 2013). Il rendrait notamment davantage possible la diversification des méthodes pédagogiques et des modes d'accès aux contenus et aux services pédagogiques (Djebara et Dubrac, 2015). Néanmoins, des travaux concluent à des usages classiques des outils numériques par les enseignants, souvent même en renfort d'une pédagogie transmissive (Albero, 2011; Paivandi et Espinosa, 2013). Par conséquent, cette recherche a pour objectif d'examiner dans quelle mesure les TIC mobilisées par …
Les méthodes biproportionnelles, un outil de reconstitution ou de comparaison de tableaux de contingence
2020
Un tableau de nombres dont on connaît le total de ses colonnes et lignes (ou « marges ») est appelé « tableau de contingence ». Un tel tableau se rencontre quand on étudie les échanges entre pays ou régions, les flux migratoires ou financiers, etc. Le premier problème qu’on étudie est la reconstitution du tableau quand on ne connaît que ses marges, mais pas les données du tableau elles-mêmes, sachant que celles-ci sont néanmoins proches de celles d’un autre tableau. C’est le cas par exemple quand on veut prévoir l’origine des échanges entre pays en connaissant seulement le total de ce qu’ils vont exporter et importer. Le deuxième problème étudié est l’évaluation de ce qui a changé entre deu…
A Simple Fusion Method for Image Time Series Based on the Estimation of Image Temporal Validity
2015
High-spatial-resolution satellites usually have the constraint of a low temporal frequency, which leads to long periods without information in cloudy areas. Furthermore, low-spatial-resolution satellites have higher revisit cycles. Combining information from high- and low- spatial-resolution satellites is thought a key factor for studies that require dense time series of high-resolution images, e.g., crop monitoring. There are several fusion methods in the bibliography, but they are time-consuming and complicated to implement. Moreover, the local evaluation of the fused images is rarely analyzed. In this paper, we present a simple and fast fusion method based on a weighted average of two in…