Résultats de recherche

Jury Prof. Nathalie BURNAY (UNamur), présidenteProf. Sabine HENRY (UNamur), secrétaireDr. Florence DE LONGUEVILLE (UNamur)Prof. Nathalie MONDAIN (Université d’Ottawa)Prof. Etienne PIGUET (Université de Neuchâtel)Prof. Sane TIDIANE (Université Assane Seck/Ziguinchor) Abstract Recent attention to environmental change has highlighted its impact on rural communities, particularly in Africa, where household-level adaptations play a crucial role in larger societal responses. Current research often overlooks these small-scale, everyday adaptations and how they evolve over time, limiting our understanding of rural communities' dynamic responses to environmental changes. This study focused on households living in rural West Africa, more specifically in the region of Saint-Louis in Senegal. To capture the complexity of the household adaptation journeys, the structured timeline mapping methodology was developed, which consists of completing timelines during interviews. Timelines were collected from 39 individuals in 17 households to explore how families perceive and adapt to environmental shifts. In addition, this research reflected on the added value and necessity of interviewing multiple household members to capture diverse lived experiences and ensure a comprehensive household-level perspective.Analysis of the data categorized the adaptation journeys into four typological groups reflecting different sensitivities and adaptive capacities: (1) diversified adjusters, (2) system maintainers, (3) environmental independence strivers, and (4) opportunity-driven adapters. All groups have differentiated responses to similar environmental changes, with differences in the temporality of the response, differences in the types of adaptations, and differences in the amount and diversity of adaptations. These differences result in resilience that evolves unevenly over time. Understanding these varied adaptation pathways lead to formulate policy recommendations aimed at improving adaptive capacity, resilience, and sustainable livelihoods.

Jury Prof. André FÜZFA (UNamur), présidentProf. Alexandre MAUROY (UNamur), secrétaireProf. Joseph WINKIN (UNamur)Prof. Raphaël JUNGERS (UCLouvain)Dr Milan KORDA (LAAS-CNRS, Toulouse)Prof. Igor MEZIC (University of California Santa Barbara) Abstract Switched systems became more and more interesting since they are conceptually closed to the description of real complex dynamics in which the state is not necessarily fixed in time but can abruptly change with the environment. In this context, not only a finite number of subsystems (said modes) are given to describe the possible state of the system, but also a switching (or commutation) law is assigned to indicate the active mode at each time.The stability theory of such systems is not intuitive since it is influenced by the commutation law, which plays a capital role.This dissertation investigates the uniform stability (i.e. stability under any commutation laws) and the switching stabilization (design of a stabilizing commutation law) problems of switched nonlinear systems.In the last decades, these problems have mainly been studied for switched linear systems and partially solved for the nonlinear case.The strategy exploited here is based on a successful tool today: the Koopman operator. This is a linear operator acting on an infinite-dimensional space of functions valued on the nonlinear system's state space. Roughly speaking, it allows one to transform a nonlinear finite-dimensional dynamics into a linear infinite-dimensional dynamics, from which one can deduce results for the original nonlinear system. More precisely, we utilize the Koopman operator framework to address switched nonlinear systems' uniform stability and stabilization problems.For the first problem, by using a Lie-algebraic solvability condition, we show that individual globally asymptotically stable nonlinear vector fields which admit a common Koopman finite-dimensional invariant subspace generate a uniformly globally asymptotically stable switched nonlinear system. In a broader context, we develop a general framework for studying the (uniform) stability of (switched) nonlinear systems on the polydisk or the hypercube. This systematic approach allows us to construct a common Lyapunov function that guarantee global uniform  asymptotic stability on the polydisk or the hypercube. We then apply this framework to derive systematic criteria for the global stability of nonlinear systems defined on the polydisk or the hypercube. Finally, for the second problem, we utilize the previously developed results to provide a  state-dependent switching stabilization strategy from  a systematic Lyapunov function of a convex combination of nonlinear vector fields.

Les diverses applications de DrawSuite sont conçues pour offrir des outils d'analyse des structures et des propriétés moléculaires. Ces applications sont intégrées à divers progiciels de chimie quantique, notamment GAMESS US et Gaussian. Les résultats de ces programmes sont ensuite utilisés pour générer des représentations scientifiques conviviales.

DrawMol est une puissante interface graphique pour visualiser et construire des structures moléculaires. 

DrawSpectrum est une interface graphique puissante pour générer et tracer des spectres. 

DrawVib est une interface graphique puissante qui permet de visualiser et d'analyser les spectres vibratoires ainsi que les déplacements atomiques des modes normaux vibratoires calculés par un programme de chimie quantique. 

DrawProfile est une interface graphique puissante qui permet de visualiser et d'analyser le profil énergétique le long d'une optimisation, le long d'une coordonnée de réaction, ou le long d'une distance, d'un angle ou d'un angle dièdre PES scan. 

JuryProf. Guillaume BERIONNI (UNamur), présidentProf. Zineb MEKHALIF (UNamur), secrétaireProf. Catherine MICHAUX (UNamur)Prof. Noureddine NASRALLAH (Université des Sciences et Technologies - Houari Boumediene)Prof. Nacira NAAR (Université des Sciences et Technologies - Houari Boumediene)RésuméThe increasing in global energy demand and environmental concerns related to traditional energy sources necessitate the exploration of sustainable alternatives. This thesis investigates the potential of thermoelectric (TE) energy conversion using conducting polymer-based composites. Traditional TE materials, while efficient, face challenges such as toxicity and limited availability. Conducting polymers offer a promising solution due to their flexibility, processability, and tunable properties. By forming composites with materials like carbon nanotubes (CNTs) and graphene, their TE performance can be significantly enhanced. Surface treatment and functionalization are crucial for optimizing these composites and improving their efficiency.The thesis reviews the principles of thermoelectricity, including the Seebeck and Peltier effects, and the limitations of traditional TE materials, setting the stage for investigating conducting polymers as alternatives.The research methodology involves synthesizing and characterizing conducting polymer-based composites, focusing on surface treatment and functionalization techniques to enhance TE performance. Various composites incorporating graphene, CNTs, and metal oxide nanoparticles (bismuth oxide or nickel oxide) are synthesized and evaluated for their TE properties. The influence of surface modifications on composite morphology, charge transport, and TE parameters is systematically studied.The findings reveal significant improvements in TE efficiency through surface treatment and composite formation. Functionalization of graphene and CNTs enhances their compatibility with polymer matrices, improving dispersion and interfacial bonding, leading to higher electrical conductivity, reduced thermal conductivity, and ultimately, greater TE efficiency. Incorporating metal oxide nanoparticles further enhances the power factor, demonstrating the potential of hybrid composites in TE applications.Bienvenue à tous et toutes !

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En recréant un observatoire astronomique sur son campus, l’UNamur ambitionnait le déploiement d’un programme pédagogique ouvert à tous, permettant d’apprivoiser les sciences par le prisme de l’observation du ciel. Cinq ans plus tard, le projet a tenu toutes ses promesses et est devenu le moteur de plusieurs partenariats dans le domaine de la médiation scientifique.  

Au programme Pendant toute la semaine, des cours universitaires seront en accès libre pour aider les élèves à franchir cette première étape d’exploration de l’enseignement supérieur.Ils pourront également rencontrer un conseiller pour faire le point sur leur choix d’études, obtenir des informations sur les programmes ou les services offerts aux étudiants.Un atelier d’orientation sera aussi proposé le mardi 22 octobre, de 13h30 à 16h, pour réfléchir au processus d’orientation, mieux appréhender le paysage de l’enseignement supérieur et définir les balises principales dans le processus de clarification de leur projet (de formation et professionnel). Plus d'informations sur les cours ouverts Contacts Info étudesRue de Bruxelles, 85 5000 Namur+32 (0)81 72 50 30info.etudes@unamur.be

La recherche du Dr Nitin Bharti, ancien doctorant du Département d’économie de la Faculté EMCP de l’Université de Namur, est couverte dans « The Economist », le prestigieux magazine économique international.  L’article traite d’une de ses thématiques de recherche de prédilection : comprendre le développement des systèmes éducatifs et leur lien avec la croissance économique et l'inégalité à long terme.