Last 7 days
Bookmark and Share    
Peer Reviewed
See detailPlanifier les leçons de stage
Scheepers, Caroline ULg

Conference (2016, July)

Il semble que la recherche se soit abondamment consacrée à ces écrits professionnalisants de nature scientifique et/ou réflexive que sont les mémoires professionnels, les portfolios ou les journaux de ... [more ▼]

Il semble que la recherche se soit abondamment consacrée à ces écrits professionnalisants de nature scientifique et/ou réflexive que sont les mémoires professionnels, les portfolios ou les journaux de bord. Mais si ces écrits visent à professionnaliser les enseignants, au sens où ils cherchent à leur faire acquérir des compétences professionnelles solides et des composantes identitaires positives (Beckers, 2007), ils restent généralement l’apanage du seul cursus académique. Une fois diplômés, les enseignants novices sont appelés à produire de véritables écrits professionnels, au rang desquels les préparations de cours occupent une place de choix. Dès lors, s’observe un hiatus certain entre les écrits en formation et les écrits du praticien. Ce hiatus peut s’expliquer et être légitimé par plusieurs motifs. Il n’en reste pas moins que les préparations de cours s’inscrivent au cœur du métier d’enseignant. Nous avons affaire à un écrit pleinement professionnalisant, mais aussi à un écrit professionnel tout à fait central dans la vie quotidienne des praticiens. Pourtant, les préparations, pour omniprésentes qu’elles soient dans les cursus académiques préparant au métier et dans les pratiques des enseignants, constituent une sorte de point aveugle pour la recherche. Ainsi, dès 2002, Jaubert et Rebière estimaient que les préparations de cours des stagiaires avaient fait l’objet de très peu d’investigations : or, insistent-elles, la préparation écrite constitue un écrit traditionnel emblématique pour la culture du monde enseignant (2002 : 130). L’ouvrage édité par Daunay (2011) à propos des écrits professionnels des enseignants consacre certains de ses chapitres à cette problématique, mais de très nombreuses questions restent à envisager. Un récent numéro des Cahiers pédagogiques (n°518, 2015) quant à lui, se penche sur les écrits professionnels des praticiens en exercice. Précédemment (Scheepers, 2013), j’ai pu interroger des enseignants, novices ou chevronnés, sur les stratégies qu’ils utilisent pour planifier leur intervention didactique. Mon article dans le Français aujourd’hui (Scheepers, 2014) envisage notamment les postures adoptées par les stagiaires dans leurs préparations et les spécificités propres aux séquences visant à faire écrire les élèves. Une autre de mes contributions (Scheepers, à paraître) envisage un corpus de plusieurs dizaines de préparations écrites par des stagiaires sous l’angle du triangle didactique (Houssaye, 1988), ce qui permet d’examiner comment se déclinent dans ces traces sémiotiques spécifiques ces trois dimensions que sont l’élève, le savoir et l’enseignant. Mais, en matière de préparations de cours, beaucoup reste à faire sur un plan scientifique. Lors de cette table ronde, je tenterai d’établir une synthèse quant à mes recherches relatives à la planification des apprentissages, dimension centrale pour l’entrée dans le métier d’enseignant. [less ▲]

Detailed reference viewed: 17 (0 ULg)
Full Text
Peer Reviewed
See detailAssessment of corrosion resistance, material properties, and weldability of alloyed steel for ballast tanks
De Baere, Kris; Verstraelen, Helen; Willemen, Remke et al

in Journal of Marine Science & Technology (2016)

Ballast tanks are of great importance in the lifetime of modern merchant ships. Making a ballast tank less susceptible to corrosion can, therefore, prolong the useful life of a ship and, thereby, lower ... [more ▼]

Ballast tanks are of great importance in the lifetime of modern merchant ships. Making a ballast tank less susceptible to corrosion can, therefore, prolong the useful life of a ship and, thereby, lower its operational cost. An option to reinforce a ballast tank is to construct it out of a corrosion-resistant steel type. Such steel was recently produced by POSCO Ltd., South Korea. After 6 months of permanent immersion, the average corrosion rate of A and AH steel (31 samples) was 535 g m−2 year−1, while the Korean CRS was corroding with 378 g m−2 year−1. This entails a gain of 29 %. Follow-up measurements after 10, 20, and 24 months confirmed this. The results after 6 months exposure to alternating wet/dry conditions are even more explicit. Furthermore, the physical and metallurgical properties of this steel show a density of 7.646 t/m3, the elasticity modulus 209.3 GPa, the tensile strength 572 MPa, and the hardness 169HV10. Microscopically, the metal consists of equiaxed and recrystallized grains (ferrite and pearlite), with an average size of between 20 and 30 µm (ASTM E 112—12 grain size number between 7 and 8) with a few elongated pearlitic grains. The structure is banded ferrite/pearlite. On the basis of a series of energy dispersive X-ray spectrometer measurements the lower corrosion rate of the steel can be attributed to the interplay of Al, Cr, their oxides, and the corroding steel. In addition, the role of each element in the formation of oxide layers and the mechanisms contributing to the corrosion resistance are discussed. [less ▲]

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailDisrupted interaction between self and memory in patients with Alzheimer’s disease
Genon, Sarah ULg; Salmon, Eric ULg; Collette, Fabienne ULg et al

Conference (2016, July)

In humans, self and memory processes interact as evidenced by the self reference (SRE) and self reference recollection effects (SRRE). However, in patients with Alzheimer’s disease (AD), this relationship ... [more ▼]

In humans, self and memory processes interact as evidenced by the self reference (SRE) and self reference recollection effects (SRRE). However, in patients with Alzheimer’s disease (AD), this relationship can be disrupted. This was evidenced by impaired SRE and SRRE in AD for recognition of adjectives previously judged for self-relevance, as well as recall of names of people previously linked to the self. For both materials, a qualitative impairment of the recollective experience for the self-related items was also observed in AD. A neuroimaging approach suggested that reduced SRE is related to decreased grey matter volume in the lateral prefrontal cortex (lPFC). Thus, retrieval of recent self-related memories is impaired in relation to altered high-order processes in lPFC in AD. [less ▲]

Detailed reference viewed: 73 (4 ULg)
Full Text
Peer Reviewed
See detailReprésentations du français et motivations des allophones à l'apprendre et à l'enseigner
Defays, Jean-Marc ULg; Geron, Geneviève

in Le Langage et l'Homme (2016)

Dans les circonstances actuelles de la mondialisation et de ses implications en matière de pratique et d’enseignement des langues, comme en matière de relations et d’interactions multiculturelles, le ... [more ▼]

Dans les circonstances actuelles de la mondialisation et de ses implications en matière de pratique et d’enseignement des langues, comme en matière de relations et d’interactions multiculturelles, le français – concurrencé dans sa diffusion et dans ses usages – doit revoir et renforcer sa position sur le marché des langues comme dans les imaginaires des personnes susceptibles de l’apprendre ou de l’enseigner. On peut compter de multiples raisons, des plus passionnelles au plus rationnelles, pour apprendre/ enseigner telle ou telle langue…ou au contraire pour en choisir une autre. Les représentations associées à la langue et à la culture françaises ont été très diverses, voire paradoxales, au cours de l’histoire : certaines les ont beaucoup servies, d’autres les handicapent toujours, de nouvelles émergent. La question de savoir « pourquoi » un étranger décide d’apprendre ou d’enseigner le français renvoie évidemment à celle de savoir « pour quoi », en deux mots : le but qu’il vise et la motivation qui l’anime au début et au cours de son projet. À l’aide de témoignages relatifs à différents contextes et publics d’enseignement, nous souhaiterions dresser un état des lieux des représentations et des motivations que les apprenants, les enseignants, les autorités éducatives étrangers invoquent actuellement en faveur ou défaveur du français. Et de nous demander comment il est possible – au sein de ces différents contextes – de les analyser, de les améliorer, de les didactiser dans le cadre d’un enseignement plurilingue et interculturel, et quels rôles les enseignants peuvent jouer, quels outils ils ont à leur disposition, quelle préparation ils devraient recevoir à ce propos. [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailThe mechanical control of peri-implant bone remodeling investigated by in vivo imaging and in silico modeling
Li, Zihui; Betts, Duncan; Kuhn, Gisela et al

Conference (2016, July)

Detailed reference viewed: 12 (1 ULg)
Full Text
Peer Reviewed
See detailMeet the Damselfishes
Parmentier, Eric ULg; Frederich, Bruno ULg

in Frederich, Bruno; Parmentier, Eric (Eds.) Biology of Damselfishes (2016)

Detailed reference viewed: 20 (3 ULg)
Full Text
Peer Reviewed
See detailOntogeny and Early Life Stages of Damselfishes
Kavanagh, Kathryn; Frederich, Bruno ULg

in Frederich, Bruno; Parmentier, Eric (Eds.) Biology of Damselfishes (2016)

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
See detailCerato-Mandibular Ligament: a Key Trait in Damselfishes?
Olivier, Damien ULg; Frederich, Bruno ULg; Parmentier, Eric ULg

in Frederich, Bruno; Parmentier, Eric (Eds.) Biology of Damselfishes (2016)

Detailed reference viewed: 14 (2 ULg)
Full Text
Peer Reviewed
See detailTrophic Ecology of Damselfishes
Frederich, Bruno ULg; Olivier, Damien ULg; Gajdzik, Laura ULg et al

in Frederich, Bruno; Parmentier, Eric (Eds.) Biology of Damselfishes (2016)

Detailed reference viewed: 32 (3 ULg)
Full Text
Peer Reviewed
See detailAnalysis of SMOS sea surface salinity data using DINEOF
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Parard, Gaëlle ULg et al

in Remote Sensing of Environment (2016), 180

n analysis of daily Sea Surface Salinity (SSS) at 0.15 ° × 0.15° spatial resolution from the Soil Moisture and Ocean Salinity (SMOS) satellite mission using DINEOF (Data Interpolating Empirical Orthogonal ... [more ▼]

n analysis of daily Sea Surface Salinity (SSS) at 0.15 ° × 0.15° spatial resolution from the Soil Moisture and Ocean Salinity (SMOS) satellite mission using DINEOF (Data Interpolating Empirical Orthogonal Functions) is presented. DINEOF allows reconstructing missing data using a truncated EOF basis, while reducing the amount of noise and errors in geophysical datasets. This work represents a first application of DINEOF to SMOS SSS. Results show that a reduction of the error and the amount of noise is obtained in the DINEOF SSS data compared to the initial SMOS SSS data. Errors associated to the edge of the swath are detected in 2 EOFs and effectively removed from the final data, avoiding removing the data at the edges of the swath in the initial dataset. The final dataset presents a centered root mean square error of 0.2 in open waters when comparing with thermosalinograph data at their original spatial and temporal resolution. Constant biases present near land masses, large scale biases and latitudinal biases cannot be corrected with DINEOF because persistent signals are retained in high order EOFs, and therefore these need to be corrected separately. The signature of the Douro and Gironde rivers is detected in the DINEOF SSS. The minimum SSS observed in the Gironde plume corresponds to a flood event in June 2013, and the shape and size of the Douro river shows a good agreement with chlorophyll-a satellite data. These examples show the capacity of DINEOF to remove noise and provide a full SSS dataset at a high temporal and spatial resolution with reduced error, and the possibility to retrieve physical signals in zones with high initial errors. [less ▲]

Detailed reference viewed: 63 (11 ULg)
Full Text
Peer Reviewed
See detailEcomorphology and Iterative Ecological Radiation of Damselfishes
Frederich, Bruno ULg; Cooper, W. James; Aguilar-Medrano, Rosalia

in Frederich, Bruno; Parmentier, Eric (Eds.) Biology of Damselfishes (2016)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailBioclimatism in Architecture : an evolutionary perspective from vernacular architecture to eco-adaptive architecture
Nguyen, Anh Tuan; Reiter, Sigrid ULg

Conference (2016, July)

The well-known Darwinian evolutionary theory (1859) introduced natural selection as the most important mechanism of evolutionary processes at every level from biological systems, including species ... [more ▼]

The well-known Darwinian evolutionary theory (1859) introduced natural selection as the most important mechanism of evolutionary processes at every level from biological systems, including species, individual organisms… to molecules such as DNA or proteins. In architecture we observe similar evolution processes which lead to the development of various architectural movements and concepts from common primitive living structures. The study points out that the development of bioclimatism in architecture has followed the pattern of a natural evolutionary process in which “natural selection” is likely motivated by several factors, including resources and environment problems, and driven by different mechanisms including novel building design concepts and methods, new standards and codes, discoveries in building science and construction costs. Finally, this study investigates new motivations in the era of climate change whose effects are expected to introduce more challenges as well as more trends towards a sustainable built environment through the new concept of Eco-adaptive architecture. [less ▲]

Detailed reference viewed: 42 (4 ULg)
Peer Reviewed
See detailOn (Eventually) Monotone Dynamical Systems and Positive Koopman Semigroups
Sootla, Aivar ULg; Mauroy, Alexandre ULg

Conference (2016, July)

Monotone systems are dynamical systems whose solutions preserve a partial order in initial conditions for all times. It stands to reason that some systems may preserve a partial order only after an ... [more ▼]

Monotone systems are dynamical systems whose solutions preserve a partial order in initial conditions for all times. It stands to reason that some systems may preserve a partial order only after an initial transient. These systems are usually called eventually monotone. While monotone systems have an easy characterization in terms of the sign pattern of the Jacobian matrix (i.e. Kamke-M\"uller condition), eventually monotone systems have not been characterized in such an explicit manner. In order to provide such a characterization, we drew inspiration from the results for linear systems, where eventually monotone (positive) systems are studied using the spectral properties of the system (i.e. Perron-Frobenius property). In the case of nonlinear systems, a spectral characterization of nonlinear eventually monotone systems is not straightforward, but can be obtained in the framework of the so-called Koopman operator. Additionally, we explore connections between (eventual) monotonicity and (eventual) positivity of the Koopman semigroup. This allows to view our results as a generalization of the Perron-Frobenius theory to nonlinear dynamical systems. We consider a biologically inspired example to illustrate the applicability of eventual monotonicity. [less ▲]

Detailed reference viewed: 34 (4 ULg)
Full Text
Peer Reviewed
See detailMagnetocapillary self-assemblies: Swimming and micromanipulation
Grosjean, Galien ULg; Hubert, Maxime ULg; Lagubeau, Guillaume et al

Poster (2016, July)

Floating magnetic particles can self-assemble into structures, by a combination of a magnetic dipole-dipole interaction and an attraction due to the interfacial deformation. These structures are ... [more ▼]

Floating magnetic particles can self-assemble into structures, by a combination of a magnetic dipole-dipole interaction and an attraction due to the interfacial deformation. These structures are periodically deformed in a non reciprocal way using magnetic fields, which leads to controllable low Reynolds number locomotion. Such microswimmers provide a basis for micromanipulation applications such as transport of micro-objects, local mixing of fluids or surface cleaning. [less ▲]

Detailed reference viewed: 34 (12 ULg)
Peer Reviewed
See detailModelling Type 1 Diabetes Mellitus Blood Glucose Dynamics as a Monotone System
Sootla, Aivar ULg; Cescon, Marzia

Conference (2016, July)

In this presentation, we study an FDA-approved Type 1 diabetes mellitus (T1DM) blood glucose dynamics simulator used in the majority of the practical studies on Artificial Pancreas (AP). We show that ... [more ▼]

In this presentation, we study an FDA-approved Type 1 diabetes mellitus (T1DM) blood glucose dynamics simulator used in the majority of the practical studies on Artificial Pancreas (AP). We show that under some physiologically plausible assumptions, the glucoregulatory system described by the model is monotone. This means that the system generates trajectories which are monotone with respect to specific changes in initial conditions and control signals. This strong property leads to many interesting observations. By using monotonicity, for example, it becomes straightforward to compute bounds on glucose concentration subject to variations in intake of carbohydrates and insulin injections. Monotonicity also rigorously justifies recent studies on fundamental limitations in glucose control. [less ▲]

Detailed reference viewed: 51 (3 ULg)
Full Text
Peer Reviewed
See detailEstimating the out-of-sample predictive ability of trading rules: a robust bootstrap approach
Hambuckers, julien ULg; Heuchenne, Cédric ULg

in Journal of Forecasting (2016), 35(4), 347-372

In this paper, we provide a novel way to estimate the out-of-sample predictive ability of a trading rule. Usually, this ability is estimated using a sample splitting scheme, true out-of-sample data being ... [more ▼]

In this paper, we provide a novel way to estimate the out-of-sample predictive ability of a trading rule. Usually, this ability is estimated using a sample splitting scheme, true out-of-sample data being rarely available. We argue that this method makes a poor use of the available data and creates data mining possibilities. Instead, we introduce an alternative .632 bootstrap approach. This method enables to build in- sample and out-of-sample bootstrap datasets that do not overlap but exhibit the same time dependencies. We show in a simulation study that this technique drastically reduces the mean squared error of the estimated predictive ability. We illustrate our methodology on IBM, MSFT and DJIA stock prices, where we compare 11 trading rules speci cations. For the considered datasets, two different filter rule specifications have the highest out-of-sample mean excess returns. However, all tested rules cannot beat a simple buy-and-hold strategy when trading at a daily frequency. [less ▲]

Detailed reference viewed: 60 (16 ULg)
Full Text
Peer Reviewed
See detailSensitivity of the breaching process in the case of overtopping induced fluvial dike failure
Rifai, Ismail ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in River Flow 2016 Proceedings (2016, July)

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme ... [more ▼]

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme hydro-logical events, and subsequently may cause their failure. Many laboratory studies of overtopping induced dike failure were conducted, dealing mainly on normal configurations (i.e. dam break configuration) without ac-counting for the influence of a parallel flow. The fluvial dike breaching process remains, therefore, insuffi-ciently studied. A simplified model assuming a parameterized evolution of the breach geometry has been de-veloped to evaluate the fluvial breaching process. Results showed a sensitivity of the breaching process to the main channel configuration and to the flow conditions. Also, the evolution mode that was prescribed for the breach cross-section strongly influences the breaching duration and the sediment discharge [less ▲]

Detailed reference viewed: 40 (7 ULg)