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See detail“Tout se passe dans le langage.” Wittgenstein et la critique du transcendantal
Gauvry, Charlotte ULg

Conference (2014, February 15)

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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 detailDevelopment of educational info capsules proposing instructional strategies aiming to deal with overweight and obese students
Cloes, Marc ULg; LEBRETHON, Marie-Christine ULg; Feron, Isaline

Conference (2014, February 13)

Irwin et al. (2003) pointed out the principles that quality PE teachers should incorporate into their pedagogical practice in order to take into account the increasing number of overweight and obese ... [more ▼]

Irwin et al. (2003) pointed out the principles that quality PE teachers should incorporate into their pedagogical practice in order to take into account the increasing number of overweight and obese students in their classes. Fighting against obesity is so complex that no simple solution can be proposed. It means that the development of specific tools providing PE teachers with new instructional strategies inspired from public health is needed (Prusak et al., 2011). Inclusion of overweight students into PE can be linked with a social ecological model (Li & Rukavina, 2012). Even if PE teachers are able to develop and implement specific instructional strategies, it seems that they need support from health experts (Cloes et al., 2013). Internet, continuing professional development activities, and educational info capsules were identified as the preferred supports to be used by the practitioners (Cloes et al., 2014). The aims of this study were to produce and validate three pedagogical capsules focusing on specific concerns of PE teachers as well as to analyze the procedure of validation. Using an extensive analysis of the literature, the researchers first identified theoretical and practical resources to be mobilized in the understanding and development of solutions for the selected problems: (1) Students’ lack of awareness about the risks of overweight and obesity; (2) Constraints associated with the motor/physical disabling; (3) Parents’ lack of awareness about PA impact on health. The capsules were then submitted to 11 experts (health specialists, health educators, psychologists, PE teachers) who had to analyze the documents. They acknowledged the content and form of the capsules. Minor changes were requested in order to finalize them. The proposed evaluation sheet was also validated but face-to-face assessment was recommended. Dissemination of the existing capsules as well as development of additional ones should be the next steps of this project. [less ▲]

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See detailL'architecture Art nouveau à Liège (1895-1914)
Charlier, Sébastien ULg

Conference (2014, February 13)

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See detailConstraints experienced by physical education teachers with overweight and obese students
Cloes, Marc ULg; Feron, Isaline; LEBRETHON, Marie-Christine ULg

Conference (2014, February 10)

Despite ‘antifat’ attitude of some PE teachers (Greenleaf & Weiller, 2005) and the PE public relations problem in regard to how obese students are treated (Irwin et al., 2003), it seems evident that this ... [more ▼]

Despite ‘antifat’ attitude of some PE teachers (Greenleaf & Weiller, 2005) and the PE public relations problem in regard to how obese students are treated (Irwin et al., 2003), it seems evident that this school subject represents a key element in the involvement of the education sector in the fight against the worldwide escalating global epidemic of obesity (Tappe & Burgeson, 2004). In fact, PE teachers consider that they lack of specific knowledge to implement instructional strategies dealing with overweight and obese students (Cloes & Ziant, 2009). Some authors proposed models to illustrate constraints that PE teachers encounter in their classes with obese students and their potential solutions (Cloes et al., 2013; Rukavina et al., 2010). On the other hand, data are missing when identifying those that are considered as their main concerns and the ways that they would prefer to receive some support regarding this specific topic. This study is focused on these two aspects. Five hundred thirteen PE teachers fulfilled an online questionnaire (Lickert scales) in which they had to determine (1) the perceived importance of 20 problems proposed by PE teachers and validated by 8 experts; (2) their relative interest toward the reception of support aiming to deal with those problems; (3) their preference for receiving information about the potential instructional strategies. Based on the answers, the top 3 problems are: (1) Students’ lack of awareness about the risks of overweight and obesity; (2) Constraints associated with the motor/physical disabling; (3) Parents’ lack of awareness about physical activity impact on health. Internet (3.49±.6/4), continuing professional development activities (3.29±.8/4), and educational info capsules (3.07±.8/4) were identified as the main resources that PE teachers would use preferentially. This study provides useful information for PE teachers’ educators who should develop now material to be shared with the practitioners. [less ▲]

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See detailMolecular dynamic simulation of the cyclic lipodepsipeptide Pseudodesmin A self-assembly
Crowet, Jean-Marc ULg; Sinnaeve, Davy; Fehér, Krisztina et al

Conference (2014, February 10)

Pseudodesmine A is a cyclic lipodepsipeptide of nine residues which presents a moderate antibacterial activity and whose structure has been resolved by X-ray and NMR1,2. In acetonitrile, Pseudodesmine A ... [more ▼]

Pseudodesmine A is a cyclic lipodepsipeptide of nine residues which presents a moderate antibacterial activity and whose structure has been resolved by X-ray and NMR1,2. In acetonitrile, Pseudodesmine A is monomeric while in chloroform it has the same structure but assemble in a supramolecular complex. This structure could associate with membranes and be responsible of the biological activity of this peptide. Comparison of the NMR data between the two solvents has given indications on the intermolecular contacts that arise in chloroform and a model for the self association was proposed2,3. To study in more details this assembly, molecular dynamics have been carried on. In acetonitrile, the peptide show transient interactions while in chlorofom interactions between monomers was always observed. As stated in Sinnaeve et al. in 2009, these interactions arise mainly between the backbone protons of the LEU1 and the GLN2, the GLN2 sidechain and the loop located on the opposite end of the monomer structure. From 10 simulations of dimerization, hydrogen bonds were followed and specific interaction patterns were identified regarding the hydrogen bonds formed. The peptide interactions are mainly described by 13 interaction patterns; 8 with the peptides in a linear configuration, 1 perpendicular and 4 with peptides side by side. The patterns are characterized by 2 to 4 hydrogen bonds. From the linear dimer, it is possible to reconstruct filaments and, by combining a linear and a lateral dimer, it is possible to build fibrils with multi filaments, as expected in the NMR derived model. Besides, the perpendicular dimer can gives peptide rings that can also explain the potential ability of this peptide to form ion pores in membranes. 1. Sinnaeve, D., Michaux, C., Van hemel, J., Vandenkerckhove, J., Peys, E., Borremans, F. a. M., Sas, B., Wouters, J. and Martins, J. C. Tetrahedron 2009, 65, 4173–4181. 2. Sinnaeve, D., Hendrickx, P. M. S., Van Hemel, J., Peys, E., Kieffer, B. and Martins, J. C. Chemistry (Weinheim an der Bergstrasse, Germany) 2009, 15, 12653–62. 3. Sinnaeve, D., Delsuc, M.-A., Martins, J. C. and Kieffer, B. Chemical Science 2012, 3, 1284. [less ▲]

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See detailAllo- and autoinhibition in barley and great brome: a laboratory study
Bouhaouel, Imen ULg; Gfeller, Aurélie; Fauconnier, Marie-Laure ULg et al

Conference (2014, February 08)

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See detailThe emergence of the possessive article pAy.f before the Amarna period
Sojic, Nathalie ULg

Conference (2014, February 07)

This presentation gives an overview of my research devoted to the Late Egyptian possessive article pAy.f. It aims at examining the uses of an element whose meaning evolved through time. Rather than ... [more ▼]

This presentation gives an overview of my research devoted to the Late Egyptian possessive article pAy.f. It aims at examining the uses of an element whose meaning evolved through time. Rather than looking for the very first occurrences of pAy.f in the Old Kingdom texts, my main concern is to analyze closely its progressive spread as well as to outline the gradual steps of its semantic evolution across the pre-amarnian corpus (15th-17th Dyn., c. 1650-1350 b.C.). On the one hand, I highlight the process by which this recent construction gradually encroaches on the older one, and on the other hand, I define the the meanings of pAy.f in relation to its distribution according to text genres. [less ▲]

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See detailAnd the winner is ... When =f and pAj=f play hide-and-seek
Winand, Jean ULg

Conference (2014, February 07)

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See detailForecasting Daily Solar Energy Production Using Robust Regression Techniques
Louppe, Gilles ULg; Prettenhofer, Peter

Conference (2014, February 05)

We describe a novel approach to forecast daily solar energy production based on the output of a numerical weather prediction (NWP) model using non-parametric robust regression techniques. Our approach ... [more ▼]

We describe a novel approach to forecast daily solar energy production based on the output of a numerical weather prediction (NWP) model using non-parametric robust regression techniques. Our approach comprises two steps: First, we use a non-linear interpolation technique, Gaussian Process regression (also known as Kriging in Geostatistics), to interpolate the coarse NWP grid to the location of the solar energy production facilities. Second, we use Gradient Boosted Regression Trees, a non-parametric regression technique, to predict the daily solar energy output based on the interpolated NWP model and additional spatio-temporal features. Experimental evidence suggests that two aspects of our approach are crucial for its effectiveness: a) the ability of Gaussian Process regression to incorporate both input and output uncertainty which we leverage by deriving input uncertainty from an ensemble of 11 NWP models and including convidence intervals alongside the interpolated point estimates and b) the ability of Gradient Boosted Regression Trees to handle outliers in the outputs by using robust loss functions - a property that is very important due to the volatile nature of solar energy output. We evaluated the approach on a dataset of daily solar energy measurements from 98 stations in Oklahoma. The results show a relative improvement of 17.17% and 46.19% over the baselines, Spline Interpolation and Gaussian Mixture Models, resp. [less ▲]

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See detailLes représentations de Synagoga aux portails occidentaux de la cathédrale d’Amiens : l’illustration de l’ « antijudaïsme » au lendemain de Latran IV ?
Lekane, Marie ULg

Conference (2014, February 04)

Les portails occidentaux amiénois sont munis de trois représentations de la Synagogue, sous la forme bien connue d’une personnification féminine aux yeux bandés. Deux scènes particulières, montrant la ... [more ▼]

Les portails occidentaux amiénois sont munis de trois représentations de la Synagogue, sous la forme bien connue d’une personnification féminine aux yeux bandés. Deux scènes particulières, montrant la Synagoga, se jouent sur des culots du portail de la Vierge, sous les pieds des Rois mages. Si l’une de ces scènes semble représenter le découronnement de la figure allégorique par le Christ, la seconde est plus énigmatique. Au portail du Jugement dernier, sous les pieds de l’archange Michel, se loge le couple antagoniste Ecclesia-Synagoga. La position éminemment négative de la Synagogue – sous le plateau démoniaque, à senestre du Christ, côtoyant le monde infernal – fait-elle écho aux récentes positions contre les Juifs prises et actées lors du Concile de Latran IV (1215) ? Afin de pouvoir amener des pistes de réflexions sur ces points, déjà soulevés par certains auteurs (W. Schlink, 1991), nous interrogerons les sources historiques sur la présence effective d’une communauté juive à Amiens et sur leurs conditions de vie. En outre, et plus généralement, nous analyserons les retombées tangibles des décisions prises lors du Concile de 1215, auquel participait Jean d’Abbeville, doyen de la cathédrale d’Amiens au moment de sa reconstruction, volontiers présenté comme « programmateur » de l’ensemble. Il est indispensable de reconsidérer soigneusement ces images et leurs composantes afin de définir leurs particularités et d’infirmer ou confirmer un « antijudaïsme » aux portails amiénois, ou du moins de pouvoir le caractériser. [less ▲]

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See detailAnthropogenic impact on alluvial sedimentation rates during the last millennia in the Ardennes (Belgium)
Houbrechts, Geoffrey ULg; Notebaert, Bastiaan; Petit, François ULg et al

Conference (2014, February 03)

Alluvial deposits of numerous rivers in the Ardennes have been dated by using iron slag content and 14C. On the basis of these analyses, several periods of increased sediment deposition have been ... [more ▼]

Alluvial deposits of numerous rivers in the Ardennes have been dated by using iron slag content and 14C. On the basis of these analyses, several periods of increased sediment deposition have been identified. Before the first deforestations, rivers in this region developed multiple channels in alluvial forests (anabranching rivers), which are still distinguishable in the topography of many floodplains by means of LIDAR survey. Moreover, during this period, floodplains were not well-developed and probably very humid, which explains the presence of peat layers within the alluvial sequences. In the Amblève catchment, the first increased sedimentary deposition of the Holocene occurred during the Bronze Age, probably in relation to deforestation and first cropland agriculture in the area. Archaeological data indicate Roman occupation in parts of the catchment, and Roman Period colluvium has been found at one site. Several peat layers have been dated in the Lienne catchment to around 1000 BP and probably indicate very low anthropogenic pressure. From the 11th Century onwards, there was an increase in sedimentation, coinciding with a higher concentration of charcoal in alluvial deposits. In many catchments there is an important increase in the sedimentation at the end of the 14th century, which can be related to the development of numerous iron-working sites. Analyses of slag concentration produced in these sites allow us to reconstruct the evolution of the floodplain topography in relation to the periods of blast furnaces activity. Total sedimentation in the smaller valleys since the initiation of iron industries amounts 0.5 to 1.0 m, which is in most cases about 40% of the total sediment present in the floodplains and corresponds to a mean sedimentation rate ranging between 10 and 20 cm/century. Such values are explained by former agricultural practices and woodland clearance associated with the huge demand for charcoal by the iron industry. For instance, about 20 ha of forest were cleared for the yearly consumption of a refining forge or a blast furnace and more than three hundred iron factories existed in the Ardenne Massif between the 14th and the 19th century. [less ▲]

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See detailEléments d'économie de la santé
Djenane, Majid; Robert, Jocelyne ULg

Conference (2014, February 02)

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See detailLes modèles économiques du bioraffinage en région wallonne : de l'exploration des débouchés et des niches de marché aux stratégies de développement industriel
Richel, Aurore ULg

Conference (2014, February)

1) Acteurs de la bio-économie en Wallonie 2 Transition vers le bioraffinage de seconde génération ? Les grandes questions et éléments de réponse (Flux de matières premières ?, Technologies de conversion ... [more ▼]

1) Acteurs de la bio-économie en Wallonie 2 Transition vers le bioraffinage de seconde génération ? Les grandes questions et éléments de réponse (Flux de matières premières ?, Technologies de conversion ? Produits cibles et marchés ? Positionnement des acteurs académiques et privés sur la chaine de valeur ? 3) Flux de matières premières en Wallonie – Carte d’occupation des sols, inventaire du potentiel en biomasse pour le bioraffinage de seconde génération (biomasse agricole, forestière, coproduits des industries de transformation food et non-food) 4) Quel(s) produit(s) et quel(s) marché(s) ? Liste des 10 molécules d’intérêt pour la Wallonie, molécules à haute valeur ajoutée et marchés de niche, cibles actuelles des recherches académiques et industrielles 5) Stratégie wallonne en termes de bioraffinage de seconde génération – quelques exemples d’initiatives R&D privées et publiques 6) Conclusions [less ▲]

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See detailPredicative Possession in Late Egyptian (with special attention to incipient grammaticalization processes)
Polis, Stéphane ULg

Conference (2014, February)

In this talk, I provide a description of the various types of constructions used for expressing clausal (‘predicative’) possession in Late Egyptian. The corpus is comprehensively defined to include both ... [more ▼]

In this talk, I provide a description of the various types of constructions used for expressing clausal (‘predicative’) possession in Late Egyptian. The corpus is comprehensively defined to include both literary and non-literary texts from the reign of Thutmose 3 (c. 1450 BC) down to abnormal hieratic texts (c. 600 BC), excluding most of the texts in Égyptien de tradition (i.e. purposely imitating various registers of EEg). The talk is structured in three sections that reflect both functional and structural features: (1) The adjectival predicate pattern or the marked expression of ownership; (2) The comitative strategy or the unmarked expression of possession; (3) Other types of predicative possession in Late Egyptian. [less ▲]

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See detailPourquoi et comment ne pas interpréter Kafka (la lecture deleuzienne)
Soskin, Jonathan ULg

Conference (2014, January 31)

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See detailQuestions de droit pénal social - Petit état de la jurisprudence
Michiels, Olivier ULg

Conference (2014, January 31)

L'exposé portait sur les points suivants : L’obstacle à la surveillance Lien de subordination Les infractions règlementaires Le moyen tiré de la violation par l’article 5 de la loi du 4 août 1996 du ... [more ▼]

L'exposé portait sur les points suivants : L’obstacle à la surveillance Lien de subordination Les infractions règlementaires Le moyen tiré de la violation par l’article 5 de la loi du 4 août 1996 du principe de légalité L’article 128, 1° du Code de droit pénal social Cumul des allocations et non bis in idem La condamnation d’office au triple des cotisations éludées La libre circulation des travailleurs provenant d’un nouvel Etat membre de l'Union Le mandataire ad hoc Le concours entre infractions de droit commun et de droit pénal social [less ▲]

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See detailAn exact bi-directional dynamic programming algorithm for an elementary shortest path problem with variable service start time
Arda, Yasemin ULg; Crama, Yves ULg; Kucukaydin, Hande ULg

Conference (2014, January 31)

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves customers by respecting their associated time windows. The vehicle can start ... [more ▼]

We consider an elementary shortest path problem with resource constraints (ESPPRC), where a capacitated single vehicle serves customers by respecting their associated time windows. The vehicle can start servicing the customers at any desired time, but it can be used for a fixed amount of time. The total transportation cost depends on the total distance traveled and the total amount of time that the vehicle spends by performing the assigned trip. On the other hand, each served customer yields a revenue. Thus, the aim is to identify the path to be followed and the start time of the vehicle from the depot that minimize the total transportation cost minus the gained revenues. This kind of a problem can be encountered as a pricing subproblem when a branch-and-price algorithm is applied to solve vehicle routing problems with additional constraints. In such a case, the revenues correspond to the dual prices of the visited vertices. It is known that the classical ESPPRC can be solved to optimality by implementing a dynamic programming (DP) algorithm. However, our problem has to take an infinite number of Pareto-optimal states into consideration, since the vehicle can leave the depot at any point in time and charges depending on the total traveling and waiting time. We propose an exact DP algorithm which can deal with an infinite number of Pareto-optimal states by representing total traveling and waiting time as a piecewise linear function of the service start time at the depot and develop suitable dominance rules. Furthermore, a column generation algorithm is devised for solving the relaxed set covering formulation of the related vehicle routing problem where new columns are determined by the proposed DP algorithm. Finally, computational results are presented. [less ▲]

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See detailL'architecture religieuse rurale à la fin du Moyen Age et au début des Temps modernes : réflexions méthodologiques
Joly, Emmanuel ULg

Conference (2014, January 31)

The end of the medieval era and the beginning of modern times are marked by the increasing importance of urban centres. But this period of time is also crucial for the reconstruction of religious ... [more ▼]

The end of the medieval era and the beginning of modern times are marked by the increasing importance of urban centres. But this period of time is also crucial for the reconstruction of religious buildings in rural areas. As a few scholars like Luc-Francis Génicot have already pointed out, a large quantity of church works were going on during the 15th and 16th century in villages throughout Europe. Although architectural historians often ignore these « marginal » buildings, these are nonetheless products of human activity and must therefore find a place within the scientific study of architecture. This lecture will then present the way the researcher, using the most recent approaches in architectural history, can reintegrate these buildings into the discipline. To study these parish churches, the architectural historian is confronted with an important amount of items. He has to understand the reasons for such abundance of constructions as well as their distribution in time and space. While dealing with formal and stylistic questions, the researcher should avoid any normative attitude leading to consider these churches simply as places of stylistical conservatism. Finally, for these low documented buildings, the architectural historian should try to answer questions as to planning, financing and implementation of church works. As a consequence, he also has to identify the various interveners in the building process. [less ▲]

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See detailPerformances littéraires et genre: proposition à partir de la notion d’ethos à travers une lecture de The Brief Wondrous Life of Oscar Wao de J. Díaz.
Berlage, Pauline ULg

Conference (2014, January 31)

Face la population transnationale d’origine latino-américaine croissante à travers le monde – spécialement présente en Espagne et aux États-Unis – je me suis intéressée à la création littéraire en tant ... [more ▼]

Face la population transnationale d’origine latino-américaine croissante à travers le monde – spécialement présente en Espagne et aux États-Unis – je me suis intéressée à la création littéraire en tant que mise en récit de Soi et de l’Autre. Dans le cadre de cette littérature latinoaméricaine de la migration, je me centrerai sur la représentation du genre dans ces romans, c'est-à-dire sur ces attitudes performatives qui (re)produisent les normes et les modèles mais aussi parfois des corps a-normatifs et illisibles (Butler, T. de Lauretis). Je proposerai donc d’articuler la notion stimulante de performance de genre telle que proposée par J. Butler à celle d’ethos rhétorique (Amossy, Maingueneau) dans le but d’analyser la voix narrative du roman The Brief Wondrous Life of Oscar Wao de Junot Díaz (2008). Cette lecture nous permettra de mettre en lumière le jeu de va-et-vient par rapport aux stéréotypes de genre qui font autorité et, plus fondamentalement, la construction d’un corps queer apatride qui s’oppose "naturellement" au corps masculin de la diaspora. [less ▲]

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See detailHow to Bind the International Criminal Court by Human Rights Standards?
Deprez, Christophe ULg

Conference (2014, January 31)

Although no one seriously disputes the binding nature of human rights standards on the activity of the International Criminal Court (“the ICC” or “the Court”), the precise boundaries of this human rights ... [more ▼]

Although no one seriously disputes the binding nature of human rights standards on the activity of the International Criminal Court (“the ICC” or “the Court”), the precise boundaries of this human rights constraint still lack clarity. In particular, there is no consensus on the basis for such an obligation, especially given the fact that the Court is not party to the relevant international and regional instruments. It is argued that the lack of clarity on the exact foundations for the binding nature of human rights standards towards the Court presents a real threat to the development of international criminal jurisprudence. This is because the legal grounds on which the ICC is bound to respect individual rights are also determinative of the very content of the resulting obligations. This paper aims to contribute to remedy this lacuna by listing and critically assessing the theoretical legal constructions on the basis of which human rights law is commonly said to enter the framework of the Court. [less ▲]

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See detailMulti-period vehicle assignment with stochastic load availability
Pironet, Thierry ULg

Conference (2014, January 31)

We investigate the following problem, which is faced by major forwarding companies active in road transportation (see [2]). A company owning a limited fl eet of vehicles wants to maximize its operational ... [more ▼]

We investigate the following problem, which is faced by major forwarding companies active in road transportation (see [2]). A company owning a limited fl eet of vehicles wants to maximize its operational pro fit over an infi nite horizon divided into equal periods (days). The pro fit stems from revenues for transporting full truckloads and from costs derived from waiting idle and moving empty. A decision leading to a set of actions is made at every period and is based on the dispatcher's information over a restricted horizon, called rolling horizon, which subsequently rolls over period per period. The data provided by the customers concern their prospective loads, or requirements for transportation: locations of departure and destination cities, and a unique pick-up period for each load. Moreover, the dispatcher has data regarding travel times between cities, current location and status (empty or loaded) of trucks. These data are known with certainty and represent the deterministic component of the problem. The stochastic component of the problem arises from the uncertainty on the eff ective materialization of each transportation order. More precisely, the availability of each order can be either con rmed, or denied, a few periods ahead of the loading period (meaning that clients con firm their order, which the transporter may still decide to ful ll, or not). For prospective orders in the remote part of the rolling horizon, the dispatcher only knows the order con firmation probability which represents the stochastic load availability. In this setting, trucking orders are provided by the dispatching center to the drivers and to the customers on the eve of the pick-up period at the latest. Typically, the loading decisions are made when all orders are con firmed for the next day. The decision problem faced by the dispatcher is to select or to reject loads, and to assign the selected loads to trucks, taking into account con firmed and expected loads as well as the availability and current location of trucks. The main objective of this research is to provide e fficient algorithmic strategies to tackle this multi-period vehicle-load assignment problem over a rolling horizon including prospective transportation orders. This problem is computationally di fficult owing to the large number of possible realizations of the random variables, and to the combinatorial nature of the decision space. The methodology is based on optimizing decisions for deterministic scenarios. By solving the assignment problem for a sample of scenarios, by mixing solutions and by evaluating them at each period, we aim at finding actions per decision period leading to pro table policies in the long run. Several policies are generated in this way, from simple myopic heuristics to more complex approaches, such as consensus and restricted expectation algorithms [3], up to policies derived from network flow models formulated over subtrees of scenarios. Similar approaches have proved eff ective for other problems; see, e.g., [1]. Myopic and a-posteriori deterministic optimization models are used to compute bounds allowing for performance evaluation. Test are performed on various instances featuring di fferent numbers of loads, graph sizes, sparsity, and probability distributions. Performances are compared statistically over paired samples to assess the signi ficance of the observed differences among algorithmic policies. The robustness of various policies with respect to erroneous evaluations of the probability distributions is also analyzed. Numerical experiments show that the best algorithms close a signi ficant fraction of the gap between the worst (myopic) and best (a posteriori) bounds for a broad range of datasets and for several probability distributions. Furthermore, the subtree algorithm remains quite robust against a variety of probability distributions when it is calibrated with a distribution re flecting maximum uncertainty . Acknowledgements. The project leading to these results was partially funded by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy O ffice (grant P7/36). References [1] Arda, Y., Crama, Y., Kronus, D., Pironet, Th., and Van Hentenryck, P. (2013), Multi-period vehicle loading with stochastic release dates, EURO Journal on Transportation and Logistics, pp. 1-27, available on-line http://dx.doi.org/10.1007/s13676-013-0035-z. [2] Powell, W. B. (1996), A stochastic formulation of the dynamic assignment problem, with an application to truckload motor carriers, Transportation Science, Vol. 30, pp. 195-219. [3] Van Hentenryck, P., and Bent,R. W. (2006), Online Stochastic Combinatorial Optimization, MIT Press, Cambridge, Massachussetts. [less ▲]

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See detailLa question du concepteur d’ensembles sculptés au Moyen Âge : le cas des portails occidentaux de la cathédrale d’Amiens
Lekane, Marie ULg

Conference (2014, January 30)

In recent decades, art historians have used the notion of program in order to characterize the structuring of an artistic ensemble by a thought or a common idea which may be of political, aesthetic or ... [more ▼]

In recent decades, art historians have used the notion of program in order to characterize the structuring of an artistic ensemble by a thought or a common idea which may be of political, aesthetic or religious order. The three west portals of Amiens Cathedral lend themselves particularly well to a programmatic reflection because they are homogeneous in their chronology, their implementation and their style. The question is even more relevant in Amiens where the statues appear to be distributed and organized in a particularly harmonious and planned way. Once structural, stylistic and iconographic filiations with earlier buildings taken into account (Notre Dame de Paris, in particular), it should important to highlight some of the Amiens peculiarities. I place this research in line with Cécile Voyer’s remark which states that differences and variations convey precious information on the image makers’ intentions. My idea is to query some iconographic or formal particularities in echo with a figure linclosely associated with the construction process and with the theological-historical context. I am thinking, in particular, of the Council of Lateran IV convoked in November 1215, that is to say ten year before the building of the West portals supposedly started, which was attended by Evrard de Fouilloy, Bishop of Amiens, who is responsible for the reconstruction of the Cathedral from 1218. The eminence of the Dean Jean Halgrin of Abbeville, regent in Theology at the University of Paris and contemporary of the early stages of the reconstruction, invites us to wonder about his possible participation in the design of the overall Amiens. [less ▲]

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See detailThe dark matter content of galaxies probed with gravitational lensing
Sluse, Dominique ULg

Conference (2014, January 30)

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See detailQuadratic reformulations of nonlinear binary optimization problems
Crama, Yves ULg

Conference (2014, January 30)

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See detailLe créateur de carton de tapisserie au XVIe siècle. Remarques méthodologiques à partir de l’activité du peintre Michel Coxcie (1499-1592)
Laruelle, Anne-Sophie ULg

Conference (2014, January 30)

Cette communication se propose de revoir, d’une manière large, les questions liées à « l’auteur » en tapisserie, en les envisageant dans le cadre de l’activité de Michel Coxcie. Artiste de cour et peintre ... [more ▼]

Cette communication se propose de revoir, d’une manière large, les questions liées à « l’auteur » en tapisserie, en les envisageant dans le cadre de l’activité de Michel Coxcie. Artiste de cour et peintre officiel de la Ville de Bruxelles, Coxcie est de loin le plus inventif et le plus productif dans le domaine de la conception de pièces tissées entre les années 1540 et 1563. Nous verrons que la contribution du « Raphaël flamand » à la tapisserie est délicate à appréhender et se présente certainement comme la plus problématique de l’ensemble de son activité (en raison des transformations dues au passage du patron vers le textile, des multiples intervenants au sein de l’atelier…). Enfin, considérer en parallèle l’activité des autres cartonniers romanistes flamands (Bernard Van Orley, Pieter Coecke, Pieter de Kempeneer) et des artistes présents en Italie (Johannes Stradanus) peut assurément contribuer à une meilleure compréhension de ces problèmes et fournir des indications sur la méthode à adopter. L’objectif est également de déterminer les limites de notre propre enquête. [less ▲]

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See detailPourquoi pratiquer la philosophie dès l'école primaire ?
Herla, Anne ULg

Conference (2014, January 29)

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See detailIntermediaries, transport costs and interlinked transactions
Tharakan, Joseph ULg

Conference (2014, January 28)

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See detailInfluence du changement climatique sur l'accroissement du hêtre en Wallonie
Latte, Nicolas ULg; Claessens, Hugues ULg

Conference (2014, January 28)

Depuis quelques décennies, des signes d’affaiblissement de plus en plus marqués ont été observés sur le hêtre (Fagus sylvatica L.) un peu partout en Europe. L’inquiétude grandissante des gestionnaires ... [more ▼]

Depuis quelques décennies, des signes d’affaiblissement de plus en plus marqués ont été observés sur le hêtre (Fagus sylvatica L.) un peu partout en Europe. L’inquiétude grandissante des gestionnaires forestiers s’inscrit dans la problématique complexe du changement climatique. Une étude dendroécologique a donc été réalisée afin de mieux comprendre la relation entre l’accroissement du hêtre et son environnement. Des mesures de cernes ont été effectuées sur des échantillons de bois issus de 158 hêtres sélectionnés dans douze hêtraies (de 84 à 206 ans) situées le long du gradient climatique de Wallonie (de 67 à 590 m d’altitude). L’analyse de l’évolution temporelle de l’accroissement et de sa relation avec le climat a abouti à 3 résultats majeurs : (1) l’accroissement du hêtre a augmenté à partir des années 30 puis à diminuer de manière soutenue à partir des années 1980, (2) la sensibilité climatique des hêtraies a aussi fortement augmenté et cette augmentation est plus forte pour les peuplements de base altitude, et (3) les températures plus élevées en été et en début d’automne ont un impact négatif de plus en plus prononcé sur l’accroissement. Le réchauffement global rend les arbres de plus en plus dépendants de l’eau disponible (précipitation et sol). Les sécheresses et canicules plus fréquentes et intenses semblent progressivement affaiblir les arbres que puissent de plus en plus dans leur réserve. L’étude comprend une discussion complète intégrant l’interprétation écophysiologique des résultats mis en évidence. [less ▲]

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See detailL’apport des cultes royaux hellénistiques au débat sur la polis religion dans le monde hellénistique
Caneva, Stefano ULg

Conference (2014, January 25)

La contribution suivante attire l’attention sur quelques enjeux du projet de recherche mené par l’Auteur, intitulé « Ritual Practicalities of Hellenistic Ruler Cults: A ‘Practice-Turn’ in the religious ... [more ▼]

La contribution suivante attire l’attention sur quelques enjeux du projet de recherche mené par l’Auteur, intitulé « Ritual Practicalities of Hellenistic Ruler Cults: A ‘Practice-Turn’ in the religious and social history of the Hellenistic period ». Le but de ce projet est de combler une lacune dans la recherche sur les cultes royaux hellénistiques en déplaçant l’attention de leurs justifications idéologiques, qui a occupé jusqu’ici une position prioritaire dans les études, à la pratique religieuse et à ses fondements sociaux. L’attention se concentrera donc sur les actes cultuels, en se posant la question de savoir comment, par qui et dans quels contextes les rituels pour les souverains furent intégrés dans la vie religieuse des communautés hellénistiques. Il s’agira de combiner l’histoire religieuse (usage, adaptation et innovation des traditions religieuses antérieures et d’éléments particuliers du culte en relation avec les cultes royaux) et l’histoire sociale et politique (les cultes royaux dans les dynamiques locales et globales ; développements diachroniques). L’aspect sur lequel se concentre la communication présente concerne la place méthodologique de l’étude des cultes royaux dans le débat sur la « polis religion » et l’ « individualisation du religieux » dans le monde gréco-romain. [less ▲]

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See detailLosses – Marks&Spencer
Richelle, Isabelle ULg

Conference (2014, January 23)

This conference will explore the history, impact, and potential for further development of the CJEU’s and the EFTA Court’s landmark decisions relating to direct taxation.

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See detailTailoring the Properties of Metallic Clusters by Ligand Coatings
Fresch, Barbara ULg

Conference (2014, January 23)

Tuning the properties of metallic clusters using different protecting ligand shells is an important step toward the application-orientated design of nanoparticles for nano-electronics and catalysis. An ... [more ▼]

Tuning the properties of metallic clusters using different protecting ligand shells is an important step toward the application-orientated design of nanoparticles for nano-electronics and catalysis. An attractive property of these materials is the ability to engineer ligand shells composed of different molecules that influence the electronic structure of the system due to their chemical interaction with the metal core. Sometimes properties are not simply additive, and cooperative effects emerge so that the presence of more than one ligand type in the ligand shell imparts novel properties to the nanoparticles. We theoretically investigate at the DFT level palladium and gold metal cores interacting with only-thiol, only-phosphine and mixed phosphine-thiol ligand shells. In this talk, we present some examples of how these capping systems affect structural, optical, magnetic and charging properties of metallic clusters. For Au11 and Au13, we show that ligation stabilizes structural isomers characterized by a flake geometry of the metal core, and they show different optical properties than isomers with a compact gold core. The magnetic ground state of small bare Pd13 clusters is a high spin state, nonet or septet depending on the structural isomer. We demonstrate that interaction with thiols and phosphines differently affect structure and magnetic ground state in these systems. The mixed ligand species Pd13(SCH3)6(PH3)6 shows multiple energetically accessible spin states and consequently an unusual thermal behaviour of the average magnetic moment. The charge transfer character of the metal-ligand interaction is studied in small Pd13 and truly nano-sized Pd55 ligand protected metal cores. We discuss cooperative effects in the ligand induced charge redistribution and demonstrate that the electron donor or acceptor character of the ligand molecules affects the energetics of charging processes [less ▲]

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See detailAspetti prosodici e testuali del raccontare: dalla letteratura orale al parlato dei media
Moreno, Paola ULg; Di Salvo, Margherita

Conference (2014, January 23)

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See detailEpigenetics and local adaptation
Hanikenne, Marc ULg

Conference (2014, January 22)

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See detailUn cas particulier d'amyloïdose AA
MILICEVIC, Martina ULg; GROSCH, Stéphanie ULg; Krzesinski, Jean-Marie ULg et al

Conference (2014, January 22)

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See detailQuantitative approaches based on Surface-Enhanced Raman Scattering (SERS) and Surface-Enhanced Raman Chemical Imaging (SER-CI)
De Bleye, Charlotte ULg; Sacre, Pierre-Yves ULg; Dumont, Elodie ULg et al

Conference (2014, January 20)

Surface-enhanced Raman scattering (SERS), discovered in 1978, is a recent technique enabling to circumvent the main limitations of classical Raman spectroscopy by dramatically exalting the Raman ... [more ▼]

Surface-enhanced Raman scattering (SERS), discovered in 1978, is a recent technique enabling to circumvent the main limitations of classical Raman spectroscopy by dramatically exalting the Raman scattering of the target molecules which are adsorbed or very closed to metallic surfaces while reducing the fluorescence impact on spectra [1]. This technique combines the sensitivity of the fluorescence keeping the structural information of molecules obtained from the SERS spectrum [2]. This last point allows to implement multiplex analyses. Moreover, it is possible to perform Surface-enhanced Raman chemical imaging (SER-CI) analyses which enable to acquire a visual representation of samples combining spectral and spatial measurements. Therefore SERS could become an attractive technique in numerous fields such as pharmaceutical and biomedical research. In this context, the feasibility of developing quantitative approaches using SERS and SER-CI on a pharmaceutical model was studied. The aim was to develop methods allowing the quantification of 4-aminophenol (4-AP) in a pharmaceutical formulation based on paracetamol. 4-AP is the main impurity of paracetamol and is actively research because of its toxicity. This pharmaceutical model was first investigated using SERS and a quantitative method enabling to quantify 4-AP from 3 to15 µg/mL was developed and validated using the standard addition method as a calibration method [3]. From these results, the possibility of developing a quantitative approach using SER-CI was investigated. Tablets based on paracetamol comprising different concentrations of 4-AP were prepared. Different ways to cover the sample surface by the SERS substrate were tested and a homogeneity study was performed to improve the repeatability of SER-CI analyses. Different spectral intensity normalizations were also tested in order to optimize the SER-CI method. Finally, a quantitative approach using SER-CI was developed allowing the quantification of 4-AP from 0.025% to 0.2% (w/w) in paracetamol tablets [4]. This first quantitative approach could pave the way to quantitative analysis of small molecules using SER-CI in complex matrices. References [1] P.L. Stiles, J.A. Dieringer, N.C. Shah, R.P. Van Duyne, Annu. Rev. Anal. Chem. 1 (2008) 601-626. [2] R.F. Aroca, R.A. Alvarez-Puebla, N. Pieczonka, S. Sanchez-Cortez, J.V. Garcia-Ramos, Adv. Colloid Interface Sci. 116 (2005) 45-61. [3] C. De Bleye, E. Dumont, E. Rozet, P.-Y. Sacré, P.-F. Chavez, L. Netchacovitch, G. Piel, Ph. Hubert, E. Ziemons, Talanta 116 (2013) 899-905. [4] C. De Bleye, P.-Y. Sacré, E. Dumont, L. Netchacovitch, P.-F. Chavez, G. Piel, P. Lebrun, Ph. Hubert, E. Ziemons, J. Pharm. Biomed. Anal. (in Press) [less ▲]

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See detailAt which level of vitamin D should we aim?
CAVALIER, Etienne ULg

Conference (2014, January 18)

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See detailSharing the Civic Sacrifice: Between Honorific Portions and Equal Division
Carbon, Jan-Mathieu ULg; Paul, Stéphanie ULg

Conference (2014, January 18)

The granting of a sacrificial portion, much like dinner in the prytaneion (sitesis, deipnon), is one of the major benefits bestowed to recipients of Greek honorific and proxeny decrees, across all regions ... [more ▼]

The granting of a sacrificial portion, much like dinner in the prytaneion (sitesis, deipnon), is one of the major benefits bestowed to recipients of Greek honorific and proxeny decrees, across all regions and periods. Yet the highlighting of an individual over and above his peers runs to some extent counter to his inclusion into a citizenship or another form of civic parity. Various inscriptions attest to this sort of tension, which can in fact be viewed as representative of the dialectic between hierarchy and equality that is characteristic of Greek sacrifice: between gods and priests, for instance, or between priests and other worshippers. These relationships were articulated in all manner of sacrifices and civic feasts, from the offering of a divine portion on the altar or cult-table, to the attribution of priestly and honorific portions of meat which were anatomically related to this divine portion, and finally to the distribution of the remaining meat among the other participants (cp. Ekroth). Several important questions can be raised concerning honorific decrees and similar epigraphic materials: Why was a specific portion sometimes, albeit not usually, granted to honoured individuals in these texts? What did the difference between a generic portion or a priestly portion (a leg, an osphys, etc.) entail concerning the status of these honourees? Did it reflect only a local custom or rather a specific intention by the polis in recognising these individuals? And what were the practical and the conceptual differences between direct participation in a civic feast (such as a demothoinia, the civic banquet par excellence) and the sending (apostellein) of perquisites to honoured individuals absent from the feast? In the end, could a distribution of meat (dais, kreanomia) ever be truly "equal", regardless of what a polis might affirm to the contrary? This paper will explore these questions in a more systematic light than has been shed on them up to the present (Schmitt Pantel, Jacquemin). One of the implications will be a partial reconsideration of the prevalent notion of "equal" division (isomoiria) with regard to Greek sacrificial animals. Despite a rhetorical emphasis on commensality and equal sharing, some individuals in the polis were necessarily "more equal than others". In certain cases, the issue was simply the inclusion of a given honouree within the sacrificial community, while in others, the prerogatives at a feast were used to indicate a special status. From a realistic perspective, one can clearly see that the dialectical tension between sacrificial hierarchy and equality was a tool, which was expressed by the varying forms of commensality in civic feasts, and which could be moulded by the polis to suit its needs. [less ▲]

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See detailExamens Certificatifs Multimedia - Etude de cas et premier bilan dans le cadre d’un cours de travaux pratiques d’Anatomie
Defaweux, Valérie ULg; Schaffer, Patrick ULg; Lecomte, Béatrice ULg et al

Conference (2014, January 17)

L’évaluation assistée par ordinateur se présente, sous ses multiples formes, comme un domaine important d’innovation technique et pédagogique (Winkley, 2010). Ses avantages par rapport aux méthodes ... [more ▼]

L’évaluation assistée par ordinateur se présente, sous ses multiples formes, comme un domaine important d’innovation technique et pédagogique (Winkley, 2010). Ses avantages par rapport aux méthodes traditionnelles ont été bien synthétisés (Boyle, & Hutchison, 2009) et les institutions d’enseignement supérieur s’interrogent sur les façons concrètes de matérialiser ceux-ci aux bénéfices de leurs enseignants et étudiants (JISC, 2007). A l’Université de Liège, les travaux pratiques d’Anatomie en Faculté de Médecine ont tout récemment donné lieu à une réflexion de ce type. Elle s’est soldée par la mise en place d’un nouveau dispositif d’examen. Cette innovation prend place dans le cadre d’un remaniement fondamental du cours, qui trouve son origine dans une augmentation significative du nombre d'étudiants et dans une volonté des enseignants de faire évoluer leurs méthodes pédagogiques. Un point majeur de la réforme a consisté à mettre à disposition des étudiants des ressources numériques inédites (images de scanners, de coupes, de bocaux digitalisés ou vidéos de dissection) et d’intégrer celles-ci à un parcours de formation revisité tant sur le plan des séances en présentiel que des possibilités de travail en autonomie. Ces changements ont entrainé la mise en oeuvre d’un dispositif d’examen sur écrans, conçu pour garantir la cohérence entre la manière d'évaluer, les méthodes d’apprentissage, les ressources manipulées et les objectifs revisités. La communication présentera les aspects techniques et pédagogiques de la nouvelle modalité d’examen, la situera dans le contexte général des travaux pratiques d’anatomie et suggèrera des pistes d’amélioration possibles, en s’appuyant notamment sur le feedback collecté, via un questionnaire, auprès des étudiants. [less ▲]

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See detailDendrochronological analysis of large tropical trees: a new approach combining photogrammetry, image processing and GIS tools
Latte, Nicolas ULg; Bauwens, Sébastien ULg; Bonnet, Stéphanie ULg et al

Conference (2014, January 17)

Tree-ring analysis of tropical trees is especially time-consuming for the largest trees. Because of large dimensions and irregular shapes, the tree-ring measurements are generally achieved (semi-)manually ... [more ▼]

Tree-ring analysis of tropical trees is especially time-consuming for the largest trees. Because of large dimensions and irregular shapes, the tree-ring measurements are generally achieved (semi-)manually directly from wood samples. The aim of this study is to present a new approach of tree-ring measurements combining photogrammetry, image processing and GIS tools that is appropriate for very large wood samples. Disks are sawed from felled trees above buttress. Small diameters holes are drilled to the disk surface to be later used as control points. Images are taken with an off-the-shelf camera and assembled with PhotoScan in order to produce an orthoimage of the green disk surface. After drying, disks are sanded (grain 80-400) and scanned with a flatbed scanner (A3 size) at high resolution (1200-2400 dpi). The scans are then mosaicked together with Autopano into one single image. Based on the control points of the green orthoimage, the ‘dry’ image is georeferenced and rectified. Using a GIS environment, tree-rings are delimited and ring widths and/or areas measured. Disks are entirely digitalized into high resolution images (0.02-0.04mm per pixel) offering a wide range of analysis possibilities. The image-based procedure reduces cost of disk handling and transportation, facilitates data processing and transfer and, is adaptable to any type of wood samples. [less ▲]

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See detailPsychogériatrie : à la croisée entre gériatrie et psychiatrie
Adam, Stéphane ULg; Schuerch, Mike ULg; PETERMANS, Jean ULg

Conference (2014, January 16)

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See detailEvaluation of pitch accuracy: from occasional to operatic singers
Larrouy, Pauline ULg; Nowak, Marion; Roig-Sanchis, Virginie et al

Conference (2014, January 15)

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See detailBio-sourced compound to modulate innate immunity
Hamaïdia, Malik ULg

Conference (2014, January 10)

Présentation powerpoint meeting Axe 4 Agriculture Is life

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See detailCritique et clinique, de la psychanalyse existentielle à la schizo-analyse
Soskin, Jonathan ULg

Conference (2014, January 10)

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See detailDes répertoires en dialogue. Gemmes et monnaies à types isiaques
Veymiers, Richard ULg

Conference (2014, January 10)

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See detailCritique et modernité
Filipucci, Alexis ULg; Pieron, Julien ULg

Conference (2014, January 09)

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See detailRain-operated Foliar Disease Transmission
Gilet, Tristan ULg; Bourouiba, Lydia

Conference (2014, January 07)

Plant diseases are a major cause of crop loss worldwide. They are known to be triggered by rainfalls. We here combine high-speed visualizations and physical modelling to elucidate the causal link between ... [more ▼]

Plant diseases are a major cause of crop loss worldwide. They are known to be triggered by rainfalls. We here combine high-speed visualizations and physical modelling to elucidate the causal link between rain impact on foliage and pathogen spreading. We identify two dominant scenarios by which the pathogens get ejected from leaves. The leaf compliance is shown to strongly affect these mechanisms. The laws of fluid dynamics set tight limits on this epidemiological problem. They suggest a revision of the current agricultural practices in order to contain the spread of foliar diseases. [less ▲]

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See detailOn the Vedic Yajamâna-
Swennen, Philippe ULg

Conference (2014, January 07)

When he is consecrated, the Vedic Yajamâna symbolically becomes an embryo because he originally had the become a new Mârtânda in order to conquer the same divine status obtained by Vivasvant thanks to the ... [more ▼]

When he is consecrated, the Vedic Yajamâna symbolically becomes an embryo because he originally had the become a new Mârtânda in order to conquer the same divine status obtained by Vivasvant thanks to the realization of the first sacrifice. [less ▲]

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See detailQuadratic reformulations of nonlinear binary optimization problems
Crama, Yves ULg

Conference (2014, January 06)

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See detailMyocardial expression of cytokines influence postoperative outcome after cardiac surgery for congenital cardiac defects
Sprute, Johanna; Heying, Ruth; Buding, Brigitte et al

Conference (2014, January)

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See detailInnovative analytical strategies for small molecules analysis by ion-mobility mass spectrometry
Eppe, Gauthier ULg; Goscinny, Séverine; Far, Johann ULg et al

Conference (2014, January)

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See detailCardiac malformations in neonates born from mothers with gestational diabetes
Antole, Nathalie; Jacquemart, Caroline; GKIOUGKI, Evangelia ULg et al

Conference (2014, January)

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See detailLe Silurien-Dévonien du Sahara Oriental Algérien (Bassin de Berkine et affleurements du Tassili n’Ajjer) : depuis la caractérisation de faciès jusqu’à la modélisation 3-D d’un réservoir non-conventionnel
Djouder, Hocine ULg; Boulvain, Frédéric ULg; Aït-Ouali, Rachid

Conference (2014, January)

Cette étude s'inscrit dans la thématique des projets Silurien-Dévonien Profond, sur la caractérisation des formations argileuses (source rock), des réservoirs gréseux conventionnels et non-conventionnels ... [more ▼]

Cette étude s'inscrit dans la thématique des projets Silurien-Dévonien Profond, sur la caractérisation des formations argileuses (source rock), des réservoirs gréseux conventionnels et non-conventionnels ainsi que de la matrice carbonatée, en partenariat institutionnel et industriel. Situé dans le Sud-Est algérien, à la limite des frontières algéro-tunisienne et libyenne, le Bassin de Berkine est un bassin intracratonique qui s’étend sur près de 102 000 km2. Au Paléozoïque inférieur, cette étendue était le siège d’une sédimentation silicoclastique puissante. Cette étude est focalisée sur le Silurien et le Dévonien. En effet, le Bassin de Berkine renferme des réservoirs potentiels : alternances argilo-gréseuses (AAG) du Silurien sommital et grès massifs du Lochkovien-Praguien et Emsien. Il renferme également des roches-mères, telles que les argiles radioactives (‘hot’) shales du Silurien, qui sont à l’origine de 80 à 90% des hydrocarbures et les argiles radioactives du Frasnien (source secondaire) avec des valeurs de TOC allant jusqu’à 14%. Au total 146 puits et une dizaine de carottes ont fait l’objet d’une analyse de facies/électrofacies et de stratigraphie séquentielle « Stacking Patterns » de haute résolution. Ceci a pour but de caractériser les séquences de dépôts et leurs environnements respectifs, puis de prédire la géométrie-cartographie des corps sédimentaires. Au final, de caractériser les propriétés pétrophysiques des « Plays » jugées potentielles. Cinq séquences principales sont mises en évidence pour le Silurien, dans le secteur de Menzel Lejmat et le Sillon de Marfag du Bassin de Berkine, à travers les puits MLEP-1 & BRD-5. Les séquences Si-1 et Si-2 sont datées du Llandoverien. Au cours de cette période, le bassin était le siège d’une importante sédimentation argileuse de (‘hot’) shales et d’argiles à graptolites de 500 à 650 m d’épaisseur. Ces faciès argileux de plate-forme externe profonde passent au sommet à des faciès carbonatés très vite surmontés par des sédiments gréseux (séquences Si-3, Si-4 et Si-5) initiateurs d’un contexte deltaïque progradant du Sud vers le Nord. Au Dévonien six unités, majoritairement gréso-carbonatées ont été décelées. Les Grès massifs de Tadrart ‘Unité b’ d’un prisme de bas niveau (LST) d’âge Lochkovien, sont constitués de dépôts fluviatiles. Ils sont surmontés par des sédiments ferrugineux de l‘Unité c’ (TST). L‘Unité d’ correspond au Praguien, suivi de la formation emsienne ‘Unité e’ (HST) à grès massifs de type fluviatile-estuarien et qui sont notamment caractérisés par des minéraux authigènes, tels que la chamosite. Ces revêtements chloriteux des grains préserve la porosité mais réduisent la perméabilité et contribuent à la destruction des propriétés pétrophysiques de ces réservoirs. L‘Unité f’ (Eifélien-Givétien) atteint environ 110 m d’épaisseur, avec un Givétien qui est essentiellement carbonaté. Au final, on observe l’installation définitive, en discordance, des argiles radioactives (‘Unité g’) d’âge Frasnien-Fammenien. L'originalité de la poursuite de cette étude consistera à coupler plusieurs techniques de caractérisation, afin de répondre aux multiples problématiques à la fois scientifiques et industrielles. Parmi les méthodes prévues pour cette étude, on retrouvera la spectrométrie DRX, la microspectrométrie InfraRouge (FTIR) ainsi que la pyrolyse Rock-Eval pour la caractérisation fine des assemblages argileux. L’étude minéralogique des faciès/microfaciès gréseux et carbonatés en microscopie (optique, MEB) et cathodoluminescence sera aussi entreprise afin de contraindre au mieux l’évolution diagénétique des réservoirs, de même que la quantification de la porosité par la méthode (14C-PMMA). Les inclusions fluides seront d’un grand apport pour comprendre l’histoire thermique du Bassin de Berkine ainsi que la relation avec les migrations primaires des hydrocarbures. L’ensemble de ces données seront exploitées dans le modèle 3D réservoirs, qui sera construit à l’aide du logiciel de l’industrie pétrolière Petrel©. [less ▲]

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See detailFluxonics
Silhanek, Alejandro ULg

Conference (2014, January)

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See detailFast chromatographic method for explosive profiling
Stefanuto, Pierre-Hugues ULg; Peyrrault, Katelynn; Focant, Jean-François ULg et al

Conference (2014, January)

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See detailQuelle méthode pour approcher les usages et les représentations dans les Conférences du Bureau d’Adresse de Théophraste Renaudot ?
Saal, Caroline ULg

Conference (2014, January)

Théophraste Renaudot, considéré comme un acteur important de la vulgarisation et de la diffusion de l’information dans la première moitié du 17e siècle en France, organisa dès 1632 des conférences ... [more ▼]

Théophraste Renaudot, considéré comme un acteur important de la vulgarisation et de la diffusion de l’information dans la première moitié du 17e siècle en France, organisa dès 1632 des conférences hebdomadaires gratuites « sur toutes sortes de matières, par les plus beaux esprits de ce temps ». Il créait ainsi un lieu original de sociabilité et de partage des savoirs. Les Conférences du Bureau d’Adresse, hétéroclites par leurs sujets (« de la colère », « des tremblements de terre », « si les païens ont raison de se tuer », « du bain »…), nous sont parvenues grâce aux comptes-rendus que Renaudot lui-même rédigeait et éditait. Ces sources se révèlent particulièrement pertinentes pour approcher les représentations du passé et ses usages sociaux. Elles témoignent d’une part de la mise en débat de phénomènes anciens et d’autre part, de la convocation de la connaissance historique lors d’une controverse. Néanmoins, elles posent question. La première tient à la forme de la source : comment dissocier la réécriture du compte-rendu et l’oralité de la conférence ? Ensuite, Renaudot a fortement résumé le propos de ces discussions et il a choisi de ne pas identifier les intervenants, les maintenant dans l’anonymat. Dès lors, quelle contextualisation opérer et quelles limites poser au travail d’herméneutique ? [less ▲]

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See detailReading the decomposition chemistry of human remains with a new pair of glasses
Stefanuto, Pierre-Hugues ULg; Stadler, Sonja; Perrault, Katelynn et al

Conference (2014, January)

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See detailAnalyse de stray-light d’un moyen d’essai de mesure de lumière parasite pour des instruments d’observation de la terre
Clermont, Lionel ULg

Conference (2014, January)

Description of the development of a facility for measuring stray light for earth observation instruments. Performance analysis by simulation (ASAP), and applications on instruments like ProbaV or Solar ... [more ▼]

Description of the development of a facility for measuring stray light for earth observation instruments. Performance analysis by simulation (ASAP), and applications on instruments like ProbaV or Solar Orbiter [less ▲]

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See detailThe territories of deliverance: sociotemporal reconfigurations of the Congolese revival
Demart, Sarah ULg

Conference (2014)

From research led for years within pentecostal Congolese circles (France, Belgium, Canada, Kinshasa) this paper explores the religious transformations of diasporic churches. The migratory reorientation ... [more ▼]

From research led for years within pentecostal Congolese circles (France, Belgium, Canada, Kinshasa) this paper explores the religious transformations of diasporic churches. The migratory reorientation, from RDC to Europe and from Europe to Canada, shows a reformulation of “deliverance”, leitmotiv of churches discourses, that informs the historical depth of the religious formation. Considering the continuity of this theology of Salvation with the prophecies of precolonial and colonial periods and the globalization in which Congolese revival is inserted, I look at how spatial mobility influence the colonial memory of theses diasporic groups. [less ▲]

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See detailDIMENSIONNEMENT ET EXPÉRIMENTATION D’UNE UNITÉ POMPE À CHALEUR / ORC RÉVERSIBLE
Dumont, Olivier ULg; Quoilin, Sylvain ULg; Lemort, Vincent ULg

Conference (2014)

L’union européenne doit réduire les émissions de gaz à effet de serre de 80% par rapport au niveau des années 90 d’ici 2020. Les ménages représentent 27% de la consommation finale. Dans ce cadre, les ... [more ▼]

L’union européenne doit réduire les émissions de gaz à effet de serre de 80% par rapport au niveau des années 90 d’ici 2020. Les ménages représentent 27% de la consommation finale. Dans ce cadre, les bâtiments dont la consommation d’énergie est quasi nulle (NZEB – Nearly Zero Energy Building) sont d’une importance considérable. A partir de 2019, tous les nouveaux bâtiments devront présenter une production d’énergie renouvelable supérieure à la consommation d’énergie primaire. C’est dans ce cadre que le concept de PAC/ORC prend tout son sens. Ce système innovant comprend une pompe à chaleur eau/eau (PAC) reliée à un toit solaire et à un échangeur de chaleur géothermique. Cette pompe à chaleur est également capable d'inverser son cycle et de fonctionner comme un Cycle Organique de Rankine (ORC). En utilisant le toit solaire comme source de chaleur, une grande quantité de chaleur est générée tout au long de l'année. Cette chaleur est utilisée en priorité pour couvrir les besoins de chauffage annuels et le surplus de chaleur généré au cours de l'été est utilisée pour produire de l'électricité dans l’unité PAC / ORC. L’article s’articule en 4 parties. Tout d’abord, l’introduction présente les trois modes de fonctionnement. Ensuite, les modèles des composants et l’évaluation des performances au point nominal de conception sont décrits. Par après, le dimensionnement et le choix des composants sont réalisés sur bases de simulations annuelles avec un pas de temps d’une heure. Enfin, les premiers résultats expérimentaux sont présentés. Un rendement de 5,7% est atteint en mode ORC (avec une température de condensation de 25°C et une température d’évaporation de 88°C) alors qu’un COP de 4,2 est obtenu en mode pompe à chaleur (avec une température de condensation de 61°C et une température d’évaporation de 21°C). [less ▲]

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See detailTransparent electrodes composed of silver nanowire networks for photovoltaic applications
Langley, Daniel ULg; Lagrange, Mélanie; Munoz-Rojas, David et al

Conference (2014)

Research is increasingly being dedicated towards replacing rare earth elements in Transparent Conductive Materials (TCMs). In this work we present the investigation of silver nanowire (AgNW) networks as ... [more ▼]

Research is increasingly being dedicated towards replacing rare earth elements in Transparent Conductive Materials (TCMs). In this work we present the investigation of silver nanowire (AgNW) networks as transparent electrodes for solar cell applications. Metallic nanowire networks can be deposited via low cost deposition techniques and exhibit very interesting electrical, optical and mechanical properties. Experimental and simulation approaches aim at improving their physical properties. Indeed, we show that a thermal annealing can drastically improve transport properties of the nearly transparent networks. We also explore the optimization of the network density. These percolating networks exhibit excellent properties (i.e. sheet resistances (Rs) of about 10 Ω/sq and optical transparency of approximately 90%) compatible with solar applications requirements. This makes them very appropriate for future uses in low cost, large area and flexible solar and display technologies. A comprehensive understanding of the main physical properties of this promising nanostructured network and its integration with solar cells will then be presented [less ▲]

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See detailValidation of a SPH model for free surface flows
Goffin, Louis ULg; Erpicum, Sébastien ULg; Dewals, Benjamin ULg et al

Conference (2014)

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See detailGenotype x Climate interactions for protein yield using four European Holstein Populations
Hammami, Hedi ULg; Carabaño, Maria-Jesus; Logar, Betka et al

Conference (2014)

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See detailThe Discoid techno-complex (MIS 3) at Ormesson and across the Paris sedimentary Basin: consistency and flexibility of a singular technical choice with relation to the lithological context
Leroyer, Mathieu; Bodu, Pierre; Salomon, Hélène ULg et al

Conference (2014)

During the last decade new excavations and reexaminations of old collection have refreshed our vision of the end of the Middle Palaeolithic. Among those advances, the identification of a "Discoid techno ... [more ▼]

During the last decade new excavations and reexaminations of old collection have refreshed our vision of the end of the Middle Palaeolithic. Among those advances, the identification of a "Discoid techno-complex” during the MIS 3 Interpleniglacial event, which differs deeply with other sub-contemporaneous technological practices, reinforce the idea that this period witnessed distinct stone knapping traditions. However, such claims must be established within different geographical and lithological context, in order to invalidate more parsimonious explanations of technical variability. The newly excavated open-air camp site in Ormesson has provided multiple well preserved archaeological layers. The older is dominated by Discoid flaking method and dates to the MIS 3. These occupations took place in a geographical context where flint is not present in situ but was easily available from different sources within the “daily range” of the site. For instance Gravettian and Châtelperronian have preferentially used Campanian flint available 5 km from the site along the Loing River. So far the lithic chaînes opératoires in the Discoid Mousterian layer are characterised by a more limited technical involvement both in term of flint procurement (lower flint quality) and knapping gesture. At the same time, the Neandertal occupants invested considerable effort to extract, import and select the raw ochreous material, whose numerous remains have been found associated with stone tool in the Layer 4. The fact that they did not take advantage of the same trips not only for ochre but also for better flint supply seems problematic. Another characteristic of Ormesson Discoid assemblage is, for the moment, the scarcity of retouched implements, in particular of notches and denticulates which frequently characterize the techno-complex in South-western France. Are such characteristics representative of a state of progress in the excavations? Are they relevant of local techno-economic tactics, or subtle cultural specificities? In addition to ongoing excavation progress at Ormesson, a complementary way to solve these questions will be to enlarge the scope of the analysis to the whole Paris Basin. In that space, Discoidal assemblages have been now studied from very contrasting geographical and lithological contexts. For instance, Arcy-sur-Cure cave sites, on one side, Beauvais and Mennecy open-air sites on the other side, are respectively located at the very margin and near the center of the limestone dominated basin. As a consequence we observe great variations of flint availability from these different contexts. The preliminary comparison of the datas available confirms the existence of similar knapping methods and goals during a limited period, broadly centered on the MIS 3. But it also suggests some intrinsic adaptability of the Discoid typo-technological system to raw material nature and availability. When replaced in that perspective, the different characteristics of stone tool production currently recognized at Ormesson don’t appear, so far, to underline any cultural peculiarity on that site and fit with a coherent vision of the Discoid techno-complex also in Northern part of France. In return, the singular preservation of Ochre at Ormesson, offers a punctual opportunity to integrate what we increasingly know about these knapping habits with more obscure but anyway complementary aspects of a cultural system. [less ▲]

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See detailEstimating Relative Change in Ventricular Stroke Work from Aortic Pressure
Kamoi, Shun; Pretty, Christopher; Chiew, Yeong Shiong et al

Conference (2014)

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See detailCortical excitability depends on time awake and circadian phase
Ly, Julien; Gaggioni, Giulia ULg; Chellappa, Sarah Laxhmi ULg et al

Conference (2014)

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See detailThe political participation of Congolese born again in Brussels (Belgium)
Demart, Sarah ULg

Conference (2014)

While the political participation of African born again christian has been leading to important research, few interest has been provided to the political participation of African evangelical immigrants ... [more ▼]

While the political participation of African born again christian has been leading to important research, few interest has been provided to the political participation of African evangelical immigrants. The ethos churches are calling to suggests however the existence of political expressions. Exemplarity (Lorentzen et Rosalina, 2005), « usefull immigration » (Mossière, 2006), combativity and social mobility (Demart, 2008), « virtuous citizenship » (Fumanti, 2010), etc. is the religious empowerment (Ter Haar, 1998 ; Harris, 2006 ; Adogame, 2007) translatable to political discourse, activity or alliance ? From research lead for ten years within Congolese circles in Belgium, I bring to light this issue looking at the political participation of Congolese born again from religious, associative and political lens. [less ▲]

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See detailEffet de la lumière sur les fonctions cognitives non-visuelles
Vandewalle, Gilles ULg

Conference (2014)

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See detailA specific example of exchange: the national churches and their corresponding "nations"
Corswarem, Emilie ULg; Berti, Michela

Conference (2014)

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See detailWakefulness regulation: from light to cortical excitability
Vandewalle, Gilles ULg

Conference (2014)

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See detailPrior light history impacts on cognitive brain function
Chellappa, Sarah Laxhmi ULg; Ly, Julien; Meyer, Christelle ULg et al

Conference (2014)

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See detailImpact of Heat Stress on Production in Holstein Cattle in four EU Regions. Selection Tools
Carabaño, Maria-Jesus; Hammami, Hedi ULg; Logar, Betka et al

Conference (2014)

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See detailFrench Pragmatic Sociology: A Materialist Renewal of Critical Theory
Frère, Bruno ULg

Conference (2014)

From Lukács to Bourdieu, many significant intellectual developments have taken place and, in fact, one may gain the impression that the critical tradition continues to be based on one key assumption ... [more ▼]

From Lukács to Bourdieu, many significant intellectual developments have taken place and, in fact, one may gain the impression that the critical tradition continues to be based on one key assumption: individuals (workers, social actors, etc.) unconsciously reproduce the social structures of capitalism whilst being alienated by them. They accept the conditions enforced on them and no longer seek to rebel against a system which impoverishes not only their work and culture, but also their [soul]problematic? and creativity. The situation may be even more diree: they ensure the reproduction of the system by seeking to engage in mass consumption at any cost, or by glorifying the dominant values. In this chapter I would like to show that toay, no critical perspective has emerged out of a negative representation of the world such is likely to introduce ‘man’ living here and now as something other than a deeply bastardized being, corrupted, denatured, perverted, inflected, soiled by a civilizing process which owes its perversion to modernity (Rousseau) on the one hand, and to capitalism on the other. As we shall see, without making an exception, Honneth has rightly noted that all the authors of the tradition of what he calls ‘social philosophy’ have remained dependent on a form of disgust regarding the world as it is. Yet for me as a sociologist of social movements, it seems difficult to deal with such a [software]? of the new forms of social resistance to domination (Indignados, anonymous, alternative economy, movements of the ‘-less’ – see Frère and Jacquemain, 2013), even though it is precisely the same kind of diagnosis adopted by a significant number of theories dealing with cooperation and association. Some amongst them leave me sceptical, notably when it comes to the shared desire to [locate,]posit? for instance, an alternative and [solidary]? economy in the field of utopia, as opposed to a succinct and time-honoured representation of Marxism (Pessin, 2001; Pradès, 2012; Hély and Moulévrier, 2013), or to subscribe to the 'natural' reciprocity of human beings as they lived before the arrival of capitalist modernity, , thus before the ideology of growth perverted human imagination (Godbout, 2000). is this right? In my opinion, in order to be able to talk about contemporary reactions of resistance against diverse forms of alienation and domination authorized by contemporary [connectionist]? capitalism, a philosophical representation of the passive, unconscious human reified by this very same domination, which only a few holy utopian thinkers would avoid, remains ineffective. This is because, in the case of such a representation, the modern subject will be likely to react when criticism will have taken away that layer of impurity specific to the condition of alienated man in order to allow him to renew his deep nature, the one which was his in the context of the ‘good life’ , as Habermas and Honneth would say . Yet abolishing the very possibility of transcendentalism and idealism which lies implicit in contemporary critical theories, whether French or German, opens the door to the possibility, in the incertitude of the social model that they may create, of an actual – but profane – criticism of capitalisme. Here, it is a matter of human relationships in the world that gives criticism its content, in all their insurmountable impurity, in all their contingency. Aiming at abolishing the transcendental anthropological foundations that criticism has always allowed itself, this gesture is currently silhouetted not in philosophy but, rather, in a sociology, that is, ‘pragmatic sociology’. Parallel to the classical Marxist tradition traversing Bourdieu’s critical sociology and the intellectual tradition of the Frankfurt School, it is a form of ‘critical materialism’ that I would like to exhume in this chapter, a notion inspired by the libertarian Marxism of Lefort and Castoriadis (see Frère, 2009), which is able to make the profane capacities of people’s emancipation emerge . I would like to do so on the basis of a reflection revolving around the pragmatic perspective which has recently been reinforced in France by Boltanski in his book De la critique (2009), but which stands – in my view – as the backdrop of all his works. [less ▲]

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See detailComment appréhender la complexité inhérente aux compétences ?
Georges, François ULg; Tardif, Jacques; Poumay, Marianne ULg

Conference (2014)

Le portfolio est souvent présenté comme un outil idéal pour documenter le développement des compétences. Sa mise en œuvre confronte les différents acteurs de l’enseignement et de la formation à la ... [more ▼]

Le portfolio est souvent présenté comme un outil idéal pour documenter le développement des compétences. Sa mise en œuvre confronte les différents acteurs de l’enseignement et de la formation à la difficile question de la description de la preuve de compétence. Comment constituer une preuve? Quels éléments apporter pour démontrer le développement de la compétence ? Cet article aborde ces questions à travers des données empiriques, celles-ci permettant d’illustrer concrètement les notions abordées. [less ▲]

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See detailPerformance et expérience esthétique : le régime contemporain (Rancière)
Hagelstein, Maud ULg

Conference (2014)

Le cadre de ce colloque repose sur le constat de la perte d’intensité de l’ancien système des Beaux-Arts ou en tout cas sur l’idée de sa réévaluation contemporaine – opérée à partir d’une attention accrue ... [more ▼]

Le cadre de ce colloque repose sur le constat de la perte d’intensité de l’ancien système des Beaux-Arts ou en tout cas sur l’idée de sa réévaluation contemporaine – opérée à partir d’une attention accrue à l’hétérogénéité des pratiques artistiques. Pourquoi mobiliser ici la figure de Rancière ? Pour la raison suivante : c’est l’un des philosophes actuels qui s’est encore donné la peine d’essayer de théoriser de manière inédite (et non moderniste ) la fin du régime traditionnel des Beaux-Arts (2ème régime). Les trois grands régimes de l’art sont chez Rancière des régimes de perception, d’identification et d’interprétation de l’art – c’est-à-dire des ensembles déterminés (culturellement et même historiquement déterminés – semble-t-il ) d’habitudes perceptives, de moyens pratiques et d’outils théoriques permettant de délimiter le champ des objets et/ou expériences artistiques. Le régime qui a contribué à engager une rupture irréversible avec le système traditionnel des Beaux-Arts (à savoir : le régime esthétique de l’art – qui affecte a priori les expériences artistiques contemporaines) se caractérise essentiellement chez Rancière par deux mouvements : (1) effacement des spécificités des arts (au profit d’une expérience sensible commune à tous les arts – qu’il faudra définir) ; (2) effacement des frontières qui séparent l’art de l’expérience ordinaire. [less ▲]

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