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See detailLiège et la France : de l’amitié à l’alliance
Balace, Francis ULg; Lanneau, Catherine ULg

Conference given outside the academic context (2014)

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See detailKosovo : la reconnaissance internationale après six années d'indépendance
Lika, Liridon ULg

Article for general public (2014)

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See detailDe l'écologie d'un discours heuristique d'acculturation à l'algèbre linéaire
DUNIA MWATI, Adrien

Doctoral thesis (2014)

ABSTRACT : Our research examines the sustainability of an acculturation heuristic discourse to Linear Algebra, prototypical gradual development of this discipline in a dialectical process with elementary ... [more ▼]

ABSTRACT : Our research examines the sustainability of an acculturation heuristic discourse to Linear Algebra, prototypical gradual development of this discipline in a dialectical process with elementary geometry. Our theoretical frameworks are borrowed from mathematics Didactic : mainly, Theory of Didactic Situations by Brousseau and Anthropological Theory of Didactics by Chevallard. These theories have enabled us to problematize the studied issue and make it a teaching "phenomenon" by giving intelligibility to the observations in a way that they are interpreted in a falsifiable hypothesis ( in Popper's sense ) which may integrate them all . In this context, the strict meaning given by Lakatos to heuristic speech has been broadly extended in terms of fundamental situation and praxeologies “modeling” according to Job and Schneider. A rational reading of historical and epistemological development of linear algebra then allowed us to build a "reference epistemological model" not only allowing us to answer to the question: "what is it to do linear algebra ?", but also to legitimize the referent heuristic discourse that served us as “phénoménotechnique”. Considering that our study is well marked, we have experimented in "secondary" and "university" institutions a heuristic device based on some selected aspects of the referent heuristic discourse. The analysis of observable that empirical work has identified has led us to identify several factors that combine to determine the ecological fragility of this speech and are at different levels of scale didactic codetermination (by Chevallard) : - The institutional variation of the curriculum of secondary education part in relation to linear systems. Including an emphasis on a resolution systems contract at the expense of their discussion, with a focus placed on the substitution method ; little technological discourse on the principles of equivalence systems and no intelligibility in terms of beams ; little work on equations as constraints with an impact on the lack of connection between the solution space of a system and the number of "independent" constraints, and finally, no ecological niche for the study of systems due to fragmentation of knowledge involved in multiple chapters. - The constraints inherent in the process of didactic transposition in terms of depersonalization and “désyncrétisation” of the knowledge but also in terms of progress in teaching time or chronogenesis. - Constraints related to teaching : a teacher accommodation to a socio-constructivist paradigm which appears as disguised exposition (ostension) and some ineffective activities ; a university pedagogy marked by “applicationnisme”, protectionism and a timing organization that puts theory on a pedestal where it is no longer in question. - An allegiance to the "mathematical" institution that is manifested, for instance, by some emblematic gestures linked to the mathematic rigor and which do not have great functionality. - Finally, an influence of the work of mathematicians on the didactic transposition, in the era of modern mathematics, which still inspires today didactic way, impeding (or being an obstacle for) linear algebra construction in dialectic with the geometry. The selected scenario for the role of interpretive hypothesis articulating these factors questions, in turn, all our education system which is too inspired by deductive theories in their completed text application. [less ▲]

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See detailAppui Institutionnel Université du Rwanda
Marini Djang'Eing'A, Roland ULg

Report (2014)

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Peer Reviewed
See detailImproving halva quality with dietary fibres of sesame seed coats and date pulp, enriched with emulsifier
Elleuch, Mohamed; Bedigian, Dorothea; Maazoun, Bouthaina et al

in Food Chemistry (2014), 145

Supplementation of halva with waste products of manufacturing, for example defatted sesame seed coats (testae) and date fibre concentrate, can improve its nutritional and organoleptic qualities. These ... [more ▼]

Supplementation of halva with waste products of manufacturing, for example defatted sesame seed coats (testae) and date fibre concentrate, can improve its nutritional and organoleptic qualities. These constituents provide high fibre content and technological potential for retaining water and fat. Standard halva supplemented with date fibre concentrate, defatted sesame testae and emulsifier was evaluated for oil separation, texture and colour changes, sensory qualities and acceptability to a aste panel. Addition of both fibres with an emulsifier, improved emulsion stability and increased the hardness of halva significantly. The functional properties of sesame testae and date fibres promote nutrition and health, supplying polyphenol antioxidants and laxative benefits. [less ▲]

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See detailSemiparametric Bayesian frailty model for clustered interval-censored data
Cetinyürek, Aysun ULg; Lambert, Philippe ULg

Report (2014)

The shared frailty model is one of the popular tool to analyze correlated right-censored time-to-event data. In the shared frailty model, the latent frailty is assumed to be shared by the members of a ... [more ▼]

The shared frailty model is one of the popular tool to analyze correlated right-censored time-to-event data. In the shared frailty model, the latent frailty is assumed to be shared by the members of a cluster and is assigned a parametric distribution, typically, a gamma distribution due to its conjugacy. However, in case of interval-censored time-to-event data, the inclusion of gamma frailties results in complicated intractable likelihoods, where the conjugacy property does not hold anymore. Here, we propose a semiparametric Bayesian frailty model for analyzing such data. We discuss three parametric specifications for frailty distribution in the analysis of interval-censored data. Afterwards we call particular attention to nonparametric specification of the frailty distribution. The results of the simulation study suggest that the proposed approach is robust to misspecification of the frailty distribution. Moreover, the performance of the proposed methodology is quite good in practical situations where the frailty distribution is multimodal or skewed. The approach is applied to dental data arising from the Signal Tandmobiel Study. [less ▲]

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See detailAdaptation ou trahison ? Réflexion sur le cinéma d'A. Kechiche
Hagelstein, Maud ULg

Conference given outside the academic context (2014)

Lors du déjeuner littéraire, nous discuterons de l'adaptation au cinéma de la bande dessinée de Julie Maroh, "Le bleu est une couleur chaude", publiée par Glénat en mars 2010. On pourra partir de ce qui ... [more ▼]

Lors du déjeuner littéraire, nous discuterons de l'adaptation au cinéma de la bande dessinée de Julie Maroh, "Le bleu est une couleur chaude", publiée par Glénat en mars 2010. On pourra partir de ce qui fait le propre des médias concernés - la bande dessinée et le cinéma - pour aborder leur rapport respectif à la temporalité et au récit. Dans ce cas précis, l'exercice d'adaptation est avant tout un effort de transcription entre des domaines d'expression aux moyens très différents. On abordera en priorité le rapport fiction/réalité, en décrivant les nombreux effets de décalage et de détournement : une histoire véritablement vécue est transformée en semi-fiction par le dessin, reprise ensuite par le réalisateur A. Kechiche. Celui-ci rend à l'histoire fictive un nouveau degré de réalité en provoquant une expérience cinématographique à la fois jouée et vécue par les actrices de son film. Entre le récit et la réalité, on a donc un système de renvois incessants, que l'on essaiera de décrypter pour montrer comment ce récit de passion gagne en intensité. [less ▲]

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See detailWood charcoal analysis: a relatively new tool for palaeoecology in tropical Africa
Morin-Rivat, Julie ULg; Biwole, Achille ULg; Bourland, Nils ULg et al

Scientific conference (2014, February 14)

This is an introduction about wood charcoal properties, collection and taxonomical identification in the framework of palaeoecological studies in Central Africa through examples of possible applications.

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See detailFormer une communauté discursive de la blague. Les conditions médiatiques du rire charivarique
Stienon, Valérie ULg

Scientific conference (2014, February 14)

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See detailScale-down effect on the extracellular proteome of Escherichia coli: correlation with membrane permeability and modulation according substrate heterogeneities
Brognaux, Alison ULg; Francis, Frédéric ULg; Twizere, Jean-Claude ULg et al

in Bioprocess and Biosystems Engineering (2014)

Protein leakage is induced in well-mixed fed-batch bioreactor by comparison with cultures carried out in scale-down conditions. This effect is attributed to a progressive increase of cell membrane ... [more ▼]

Protein leakage is induced in well-mixed fed-batch bioreactor by comparison with cultures carried out in scale-down conditions. This effect is attributed to a progressive increase of cell membrane permeability and the synthesis of several outer-membrane components allowing to cope with substrate limitation commonly found in high-cell density culture. A comparative analysis of protein leakage has thus been performed in well-mixed bioreactors and in scale-down devices. The extracellular proteome of E.coli has been investigated by 2D-gel electrophoresis and identified by subsequent MALDI-TOF analysis. On 110 picked spots, 67 proteins have been identified and the sub-localisation and the molecular function of these proteins have been determined. A majority of the extracellular proteome was composed of outer-membrane and periplasmic proteins (64%) confirming the fact that leakage is involved in high-cell density cultures. About 50% of this extracellular proteome was composed of transport and binding proteins. Furthermore, the more abundant spots on the gel corresponded to porin proteins and periplasmic transporters. In particular, the OmpC porin was found to be very abundant. Moreover, the scale-down effect on this extracellular proteome has been investigated by 2D-DIGE analysis (2-Dimensional Differential in-Gel Electrophoresis) and significant differences have been observed by comparison with culture carried out in well-mixed systems. Indeed, since substrate limitation signal is alleviated in this kind of apparatus, cell permeability was lowered as shown by flow cytometry. In scale-down conditions, protein leakage was thus less abundant. [less ▲]

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See detailRecent advances and improvements in computerized adaptive testing with the R package catR
Magis, David ULg; Barrada, Juan

Conference (2014, February 14)

The purpose of this talk is to present recent advances and developments of the R package catR. This package allows for random generation of response patterns under computerized adaptive testing (CAT) and ... [more ▼]

The purpose of this talk is to present recent advances and developments of the R package catR. This package allows for random generation of response patterns under computerized adaptive testing (CAT) and holds various options to select the first items, estimate ability, select the next item, stop the test and return final results. Two main improvements were realized. First, several rules for next item selection were added, among others, Kullback- Leibler, progressive and proportional methods. Second, catR was limited to dichotomous IRT models so far. The most recent update allows now for several polytomous IRT models, such as partial and generalized partial credit model, graded and modified graded response models, rating scale model, and nominal response model. All improvements will be shortly presented, both from a theoretical point of view and in terms of practical implementation in catR. If possible, several illustrative examples will be displayed in a short live demonstration of catR. [less ▲]

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See detailA short insight into the ecology of Pericopsis elata (Harms) Meeuwen (Fabaceae) in southeastern Cameroon
Bourland, Nils ULg; Doucet, Jean-Louis ULg

Scientific conference (2014, February 14)

Some key points of the autecology of Pericopsis elata in Southeastern Cameroon. Implications are given for the sustainable forest management of the species in the context of selective logging.

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See detailLes creux de l'historiographie rwandaise
Singiza, Dantès ULg

Scientific conference (2014, February 14)

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See detailLa discipline scolaire "français" : du questionnement identitaire à la conscience disciplinaire. Panorama sur les zones avancées de la francophonie et gros plan sur le cas particulier de l'enseignement du français au secondaire supérieur en Fédération Wallonie-Bruxelles
Van Beveren, Julien ULg

Doctoral thesis (2014)

Après avoir envisagé l'introduction de l'approche par compétences et l'élargissement du corpus des supports d'apprentissage du cours de français comme deux des causes possibles de la crise identitaire que ... [more ▼]

Après avoir envisagé l'introduction de l'approche par compétences et l'élargissement du corpus des supports d'apprentissage du cours de français comme deux des causes possibles de la crise identitaire que nous semble traverser cette discipline scolaire, nous nous sommes livré à l'analyse d'un grand nombre de livraisons de la revue de l'Association internationale des chercheurs en didactique du français, afin de nous interroger sur la rareté des publications ayant trait à la discipline scolaire "français" dans son ensemble. Dans la troisième partie de notre thèse, nous nous sommes penché sur la notion de discipline scolaire et sur quelques syntagmes qui y sont liés, avant de nous focaliser sur l'enseignement-apprentissage du français, au secondaire supérieur, en Fédération Wallonie-Bruxelles. Ajoutons que c'est surtout selon la perspective du didacticien-formateur que nous avons analysé cet enseignement-apprentissage. [less ▲]

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