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See detailInterprétation et élucidation du récit de rêve
Gauvry, Charlotte ULg

Conference (2010, June)

Detailed reference viewed: 6 (0 ULg)
See detailCompromise and Society of Compromise : Some major lines
Nachi, Mohamed ULg

Conference (2010, June)

Le réflexion vise à dégager quelques traits saillants de ce qu'on pourrait appeler "société de compromis"

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See detailLarge-scale palaeontological data analysis of the conodonts fossil history
Martínez-Pérez, Carlos; Botella, Héctor; Cascales - Miñana, Borja ULg

Conference (2010, June)

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See detailTEC reconstruction using dual frequency modernized GPS (L1/L5) and GALILEO (E1/E5A) measurements
Warnant, René ULg; Lonchay, Matthieu ULg; Spits, Justine et al

Conference (2010, June)

GPS dual frequency L1/L2 measurements have been used for many years to reconstruct the ionosphere Total Electron Content and to detect small-scale irregular structures in the ionospheric plasma. TEC is ... [more ▼]

GPS dual frequency L1/L2 measurements have been used for many years to reconstruct the ionosphere Total Electron Content and to detect small-scale irregular structures in the ionospheric plasma. TEC is usually computed by forming the geometry-free combination of L1/L2 phase measurements. Most of the existing techniques use the geometry-free combination of code measurements to solve the non-integer geometry-free ambiguity. This methodology requires the computation of satellite and receiver hardware biases. In addition, the quality of the ambiguity resolution process strongly depends on code multipath. New signals from Galileo and from modernized GPS offer new opportunities for TEC reconstruction. First attempts to compute TEC using triple frequency measurements from modernized GPS (L1/L2/L5) and from Galileo (E1, E5a, E5b) give very promising results but, at the present time, only a few triple frequency GPS/Galileo receivers are available. The University of Liege has purchased two Septentrio PolaRx3G receivers which allow tracking GPS L1/L5 and Galileo E1/E5a signals. These receivers have been installed at the Geophysical Observatory of Dourbes (50.1°N, 4.6° E) and are continuously tracking all GPS and Galileo satellites in view (including GPS SVN49/PRN01, Giove A and Giove B) since November 2009. The paper analyzes the added value of L1/L5 and E1/E5a geometry free combinations and of the new GPS and Galileo signals for TEC reconstruction. It discusses the influence of multipath and of SVN49/PRN1, Giove A and Giove B hardware biases. [less ▲]

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See detailPotential estimation of titratable acidity in cow milk using mid-infrared spectrometry
Colinet, Frédéric ULg; Soyeurt, Hélène ULg; Anceau, Christine ULg et al

Conference (2010, June)

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the ... [more ▼]

Milk coagulation has a direct effect on cheese yield. Several factors influence the milk coagulation kinetics. In addition to calcium and milk protein concentrations, titratable acidity influences all the phases of milk coagulation. The objective of this research was to study the feasibility of prediction of titratable acidity directly in bovine milk using mid-infrared spectrometry. In order to maximize the variability in the measurements of titratable acidity, milk samples were collected on basis of several criteria (e.g. breeds). The titratable acidity was recorded as Dornic degree. All samples were also analyzed by MIR spectrometry. Using partial least squares regressions and first derivative pretreatment of spectral data, a calibration equation was built to predict the Dornic degree in cow milk. First results were promising and showed the potentiality to this calibration. The calibration and cross-validation coefficients of determination were 92.25 and 89.88 %, respectively. Moreover, the ratio of standard error of prediction to standard deviation was 3.13 and permits us to consider the calibration equation as usable in most application such as scientific researches and the screening of the Walloon dairy herd particularly in order to improve the milk coagulation properties. [less ▲]

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See detailRepresenting real numbers in a generalized numeration system
Charlier, Emilie ULg

Conference (2010, June)

We show how to represent an interval of real numbers in an abstract numeration system built on a language that is not necessarily regular. As an application, we consider representations of real numbers ... [more ▼]

We show how to represent an interval of real numbers in an abstract numeration system built on a language that is not necessarily regular. As an application, we consider representations of real numbers using the Dyck language. We also show that our framework can be applied to the rational base numeration systems. [less ▲]

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See detailComparison of growth limits of Listeria monocytogenes in milk, broth and cheese
Jordan, Kieran; Schvartzman Echenique, Maria Sol ULg; Belessi, C et al

Conference (2010, June)

Detailed reference viewed: 25 (0 ULg)
See detailWillingness-to-pay for local milk-based dairy products in Senegal
Lefevre, Mélanie ULg

Conference (2010, June)

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Exploiting data from a choice-based ... [more ▼]

This paper aims to evaluate Senegalese consumers' willingness-to-pay (WTP) for local fresh milk-based products, in opposition to the ones produced with imported powder. Exploiting data from a choice-based-conjoint analysis conducted on 400 households in the region of Dakar, we evaluate the premium that consumers are willing to pay for fresh raw material (rather than powder) in the composition of sour milk. Based on an Ordered Probit Model, the results show evidence for a positive WTP for fresh raw material, which may be seen as a strong indication of preference for local products. This WTP greatly depends on the characteristics of the households. Wealthier households are willing to pay more than the medium households, while big households are ready to pay much less than the base category ones. Obviously, some niche markets exist, that producers may target to sell the local milk-based dairy products. However, more information has to be provided about the composition of dairy products, as consumers are not currently able to distinguish both types of raw material, even if they are willing to pay more for one of them. In spite of some restrictions about the presence of a potential "hypothetical bias" due to the nature of the data, this study gives a first insight of consumers' preferences for local milk-based dairy products. [less ▲]

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See detailImpact of age and breed on incidence of clinical signs after natural infection with bluetongue virus serotype 8 in sheep
Kirschvink, N.; Leemans, J.; Bolkerts, B. et al

Conference (2010, June)

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See detailInvestigations of the GCxGC-HRMS coupling
Focant, Jean-François ULg; Patterson Jr

Conference (2010, June)

Detailed reference viewed: 19 (0 ULg)
See detailAn Early Cretaceous ichthyosaur from SE France: implications on the evolution of post-Liassic Ichthyosauria
Fischer, Valentin ULg; Clément, Arnaud; Guiomar, Myette et al

Conference (2010, June)

A complete ichthyosaur rostrum with 124 associated teeth was recently discovered in Laux-Montaux locality, department of Drôme, southeastern France. The associated belemnites and ammonites indicate a late ... [more ▼]

A complete ichthyosaur rostrum with 124 associated teeth was recently discovered in Laux-Montaux locality, department of Drôme, southeastern France. The associated belemnites and ammonites indicate a late Valanginian age (Neocomites peregrinus Zone, Olcostephanus nicklesi Subzone) for this fossil, which consequently represents the first diagnostic ichthyosaur ever reported from Valanginian strata. Despite its incompleteness, this specimen is perfectly consistent with Aegirosaurus leptospondylus WAGNER 1853 and is therefore referred to this rare taxon. This specimen thus greatly increases the temporal and geographic biozones of this taxon, which was previously restricted to the Tithonian (Upper Jurassic) lithographic limestones of Bavaria (southern Germany). Moreover, it indicates that Late Jurassic ichthyosaurs actually crossed the Jurassic-Cretaceous boundary with a much lighter diversity drop than previously supposed. Finally, tooth morphology and wear pattern suggest that Aegirosaurus belonged to the “Pierce II/ Generalist” feeding guild sensu Massare (1987; 1997), which was hitherto not represented in post-Liassic ichthyosaurs. [less ▲]

Detailed reference viewed: 147 (4 ULg)
See detailMass spectrometry of G-quadruplexes
Gabelica, Valérie ULg

Conference (2010, May 31)

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See detailLes enjeux financiers et budgétaires
Husson, Jean-François ULg

Conference (2010, May 31)

This presentation offers an overview of the public financing of religious and philosophical communities in Brussels-Capital Region, by both regional and local authorities. Amounts and challenges are ... [more ▼]

This presentation offers an overview of the public financing of religious and philosophical communities in Brussels-Capital Region, by both regional and local authorities. Amounts and challenges are presented. [less ▲]

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See detailL'insuffisance rénale
Krzesinski, Jean-Marie ULg

Conference (2010, May 30)

Detailed reference viewed: 8 (2 ULg)
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See detailProducing Objectivity Under Assumption of Values
Dewalque, Arnaud ULg

Conference (2010, May 29)

My intention is to put the problem of objectivity under examination from a very specific viewpoint, namely by focusing on the theory of judgement, which has been defended in the so-called South-Western ... [more ▼]

My intention is to put the problem of objectivity under examination from a very specific viewpoint, namely by focusing on the theory of judgement, which has been defended in the so-called South-Western School of neo-Kantianism. As one knows, the main representatives of this School are Wilhelm Windelband, Heinrich Rickert, Emil Lask and Bruno Bauch. Those authors are known, first and foremost, for having supported the view that valuation and assumption of values play a basic role in almost all the domains of our life, including our scientific life. This view forms the basis of their theory of knowledge or epistemology, which is prior to any methodological distinction between natural and cultural sciences (so it would be misleading to say that they confine that view to their foundation of cultural sciences and humanities). What, then, does such an ‘axiological’ theory of knowledge exactly mean? What does it imply for the construction of a theory of objectivity? And how is it related to Kant’s foundational program? [less ▲]

Detailed reference viewed: 28 (2 ULg)
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See detailL'alimentation des enfants prématurés aujourd'hui
Senterre, Thibault ULg

Conference (2010, May 29)

Detailed reference viewed: 19 (0 ULg)
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See detailVisual memory is conceptual and visual search is perceptual: how meaning and expertise may confirm this hypothesis?
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2010, May 28)

The purpose of this study was to evaluate how stimulus meaning and subject’s expertise differentially influence visual memory and visual search. In order to answer this question, 20 novices and 20 experts ... [more ▼]

The purpose of this study was to evaluate how stimulus meaning and subject’s expertise differentially influence visual memory and visual search. In order to answer this question, 20 novices and 20 experts (art historians) performed both long term visual memory (LTVM) and visual search tasks with abstract and non-abstract stimuli (paintings). In the LTVM task, subjects were presented 100 abstract and 100 non-abstract paintings and after each stimuli set presentation, they performed a 3-forced-choice recognition test. In the visual search task, subjects had to find targets as quickly as possible in abstract or non-abstract paintings. Our data showed experts performed better than novices in LTVM task for both abstract and non-abstract stimuli, whereas novices and experts had a similar performance in the visual search task. This result suggests expertise and thus previous knowledge about the stimulus increase memory performance but not visual search performance. Concerning the type of stimulus, performance in LTVM with non-abstract paintings was better than with abstract paintings while the contrary was observed in the visual search task. Stimulus meaning is thus a significant factor for visual memory (as also shown by Chatterjee et al., JOV, 2008) but not for visual search. In conclusion, our findings suggest stimulus meaning and subject’s expertise influence VLTM but not visual search. These results confirm that VLTM is rather conceptual and influenced by top-down processes (like meaning and expertise) while visual search is rather perceptive and influenced by bottom-up processes (as suggested by Konkle, JEP, in press). [less ▲]

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See detailIndéterminations de la photographie (II)
Havelange, Carl ULg

Conference (2010, May 28)

Detailed reference viewed: 10 (3 ULg)
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See detailPerson recognition: Effects of face and voice learning on access to semantic information from names.
Barsics, Catherine ULg; Marloye, Zoé

Conference (2010, May 28)

Several studies showed that it is more difficult to retrieve semantic information from recognized voices than from recognized faces. However, earlier studies that investigated the recall of biographical ... [more ▼]

Several studies showed that it is more difficult to retrieve semantic information from recognized voices than from recognized faces. However, earlier studies that investigated the recall of biographical information following person recognition used stimuli that were pre-experimentally familiar to the participants, such as famous people’s voices and faces. The present study was designed in order to allow a stricter control of frequency exposure with both types of stimuli (voices and faces). In the present study, subjects had to associate lexical (i.e., name) and semantic information (i.e., occupation) with faces or voices. When asked later to recall semantic information being cued by the person’s names, participants provided significantly more occupations for the targets that had been previously associated with faces than with voices. These results and their implications for current Interactive Activation and Competition person recognition models are discussed. Finally, the potential role of the relative distinctiveness of voices and faces is also considered. [less ▲]

Detailed reference viewed: 51 (10 ULg)
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See detailPrerequisites for the implementation of a new heroin-assisted centre
Demaret, Isabelle ULg

Conference (2010, May 28)

Prerequisites for the implementation of a new heroin-assisted centre Background: TADAM, a randomised controlled trial of heroin-assisted treatment, will begin in Liège, Belgium, in 2010. Heroin-assisted ... [more ▼]

Prerequisites for the implementation of a new heroin-assisted centre Background: TADAM, a randomised controlled trial of heroin-assisted treatment, will begin in Liège, Belgium, in 2010. Heroin-assisted treatment of treatment resistant heroin addicts has been successfully tested in six countries: Switzerland, The Netherlands, Spain, Germany, Canada and United-Kingdom. Each country used a randomised controlled trial to assess this new treatment. It has now a strong evidence-based foundation. However in the peer-reviewed articles, there is little information on the concrete conditions to fulfil before implementing this treatment. With the experience of the other countries and ours, we have listed those conditions. Methodology: We collected information concerning the randomised controlled trial. This included articles published in international peer-review journals, reports, visits to heroin-assisted treatment centres and information given by researchers who participated in those experiments. We will illustrate our presentation with the example of Liège. Results: Before all, a political agreement at the national level is mandatory. It is never guaranteed even if it was already given in the past. Methadone treatments must be available and the collaboration with the addiction network will be an advantage for the project. There must be a sufficiently high number of heroin addicted in the concerned area and they must be correctly informed about the heroin-assisted treatment. But even if it is the case, the inclusion of the foreseen number of patients can be more difficult than expected because it is problematic to assess the exact number of patients fulfilling the inclusion criteria and because not all the eligible participants will accept to enter this treatment. Conclusion: For reasons other than medical or scientific ones, implementing a new heroin-assisted centre is still a challenge. [less ▲]

Detailed reference viewed: 16 (3 ULg)
See detailPiles à combustible : situation actuelle et perspectives
Job, Nathalie ULg

Conference (2010, May 27)

Detailed reference viewed: 20 (5 ULg)
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See detailEvidence for atypical categorical speech perception in Williams syndrome.
Majerus, Steve ULg; Poncelet, Martine ULg; Serniclaes, W. et al

Conference (2010, May 27)

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See detailAdvanced engine dynamics using MBS: Application to twin-cylinder boxer engines
Louvigny, Yannick ULg; Duysinx, Pierre ULg

Conference (2010, May 27)

Engine simulation is an important issue to design mechanical components and to reduce the development cost of new vehicles. Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid ... [more ▼]

Engine simulation is an important issue to design mechanical components and to reduce the development cost of new vehicles. Dynamic simulations of a twin-cylinder boxer engine are carried out with rigid and flexible multibody models using the finite element approach. In a first step, simulations of the engine running at constant revolution speed (4000 rpm) are done taking advantages of the actual geometry of engine parts coming from CAD models. Forces due to the gas pressure are added in the simulation to calculate more precisely the load applied on each engine part. A mixed model is developed; pistons and connecting rods are considered as rigid bodies while the crankshaft is meshed with flexible brick elements. With this model, calculation of crankshaft stresses and displacements is possible. Then, simulations are made with engine speed variations to evaluate the effect of inertia. Due to the complex shape of the crankshaft, the CPU time and computer resources can be important. As simulations with a variable rotation speed have to be carried out on a larger number of engine revolutions, it becomes difficult to work with the fully detailed crankshaft geometry. So, simplified models (a tridimensional model with simplified geometry and a beam model) of the crankshaft are developed and compared. These models are first validated with different tests including results of constant speed flexible simulations. [less ▲]

Detailed reference viewed: 142 (8 ULg)
See detailEvaluation des capacités parentales
Degraux, Christine ULg

Conference (2010, May 27)

Detailed reference viewed: 11 (0 ULg)
See detailLes voies traditionnelles de production d’hydrogène
Léonard, Angélique ULg

Conference (2010, May 27)

Detailed reference viewed: 12 (5 ULg)
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See detailMaternal transfer of trace metals to offspring in grey seals
Habran, Sarah ULg; Pomeroy, Paddy; Debier, Cathy et al

Conference (2010, May 25)

Marine mammals may display high heavy metal levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Some lactating female phocids fast during ... [more ▼]

Marine mammals may display high heavy metal levels in their tissues, which raises the question of the importance of toxic metal transfer from mother to offspring. Some lactating female phocids fast during the suckling period. This fasting period involves not only an important mobilization of energy reserves, but also mobilization of potentially associated contaminants. We studied maternal transfer of trace metals to offspring in the grey seal (Halichoerus grypus). Trace metal concentrations were measured in whole blood, milk and hair of mother-pup pairs in early and late lactation. Metal levels in blood decreased according to the following pattern: Fe > Zn > Se > Cu > Hg > Pb > Cr > V in mothers and pups. Cd and Ni were not detected and V, Cr and Pb levels were very low in maternal and pup blood. However, Ni and Pb levels were detected in the milk showing a transmammary transfer of these metals. Hg levels in blood and milk were higher than levels of previous metals and levels varied significantly throughout lactation. The increasing maternal levels over lactation were likely due to the remobilization of energy reserves during fasting and milk production in mothers causing a Hg release in blood. All metals were detected in hair and lanugo according to the following pattern: Fe > Zn > Hg > Cu > Se > Ni > V > Pb > Cd > Cr in mothers and Zn > Fe > Hg > Se > Cu > Pb > Ni > V > Cr > Cd in pups. Pb levels were relatively high in comparison with other phocid species. Only Hg showed a significant relationship between hair/lanugo and blood levels. This study highlights (i) a transplacental and transmammary transfer of metals in grey seals, and shows that (ii) physiological processes such as lactation and/or fasting can modify trace metal levels in the blood of mothers and pups. [less ▲]

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See detailGlucose-responsive layer-by-layer microcapsules: a potential route to self-regulated insulin delivery
Alaimo, David ULg; Detrembleur, Christophe ULg; Auzély-Velty, Rachel et al

Conference (2010, May 25)

Detailed reference viewed: 30 (4 ULg)
See detailLa GRH, levier de changement?
Pichault, François ULg

Conference (2010, May 22)

Detailed reference viewed: 74 (7 ULg)
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See detailNouveaux agents anti-inflammatoires en série N-(4-pyridyl)alcanesulfonamide
Renard, Jean-François ULg; Lecomte, Frédéric ULg; de Leval, Xavier et al

Conference (2010, May 21)

Detailed reference viewed: 70 (19 ULg)
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See detailPolitiques, stratégies et pratiques en cours à la FAPSE de l’ULg et dans les Hautes Écoles de la Communauté française de Belgique
Denis, Brigitte ULg

Conference (2010, May 20)

The author presents different uses of ICT in courses and training curriculums at the Faculty of Psychology and Educational Sciences of the University of Liège. She also deals with some considerations on ... [more ▼]

The author presents different uses of ICT in courses and training curriculums at the Faculty of Psychology and Educational Sciences of the University of Liège. She also deals with some considerations on initial and continuous training in ICTE uses in High Schools of the French Community of Belgium. The presentation ends on different elements to be considered about policies, strategies and practices (e.g. Insertion of courses in the official initial training curriculums, teachers' certification in ICT and ICTE in Higher Education, ICT mastery...ergonomy and acceptability of tools, isomorphism principle, evaluation, creation and animation of networks and communities of practice to sustain contiunous traing). [less ▲]

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See detailHow King Leopold II used Emile de Laveleye’s intellectual network for the benefit of his African project…
Vandersmissen, Jan ULg

Conference (2010, May 20)

The “Belle Epoque” saw the revival of the colonial idea in new forms. A second European colonization wave washed over Africa. King Leopold II unfolded his activities in Congo from 1876 onwards. There, his ... [more ▼]

The “Belle Epoque” saw the revival of the colonial idea in new forms. A second European colonization wave washed over Africa. King Leopold II unfolded his activities in Congo from 1876 onwards. There, his efforts to develop a so-called “philanthropic” enterprise soon evolved in a process of state formation, overshadowed by intrigues and tensions that were a consequence of colonial competition between the western powers. Only a decade later, at the Berlin Conference of 1885, a definite arrangement was adopted. Everywhere in Europe, a disputed transition was made from liberal to more conservative ways of government. Of course this tension field also dominated intellectual life. There was an intense debate between partisans of colonialism and supporters of worldwide free trade. For the development of his colonial doctrine Leopold II had been inspired by intellectuals that supported economic expansionism. Most of them were active in the field of economic geography. But the King also searched for support in other academic circles and mobilized one of Europe’s brightest minds to join him in his quest for the most adequate economic, social and political model of a future state in the heart of Africa. In his books, articles and pamphlets, the liberal minded political economist Emile de Laveleye (1822-1892) – an opinion maker of European renown – showed himself an unshakable opponent of colonization and imperialism. However, in the period 1875-1885 – a decade so crucial for Congo – a surprising intellectual rapprochement between de Laveleye and Leopold II was established. For a certain time, this competent man of science advised the King, for example at the International Geographical Conference in Brussels, putting into royal service an intellectual network of European range. This paper investigates how, in the complex and constantly evolving public discussion about Congo, two apparently opposing minds attracted each other. Analyzing de Laveleye’s publications and correspondence we focus on his important pleas for a “neutral and international formula” that would place Leopold II in a conflicting situation with Portugal and France, countries that claimed Congo’s estuary for their own benefit. De Laveleye believed that Leopold was sincere about his civilizing mission and crusade against slavery. This study shows how, in the years preceding the Berlin Conference, de Laveleye got actively involved in a carefully orchestrated European media campaign in support of Leopold’s initiative. It was there that his intellectual circle became extremely useful and was fully implicated. His contacts in the world of law, especially among experts of international law, contributed to the important discussions about Congo’s juridical status. De Laveleye’s colleague Sir Travers Twiss, one of the most reputed jurists of that time, as well as the influential Institut de Droit international, of which de Laveleye had been one of the founders, entered the debate zone and took positions that were favorable for Leopold’s project. With this new approach, our paper also aims to give insight in the way Leopold II transformed his own reasoning into a more authoritative set of practical standards that were shared by an intellectual elite. [less ▲]

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See detailL’orgueil de Foucault. Ontologie, expérience et critique
Bolmain, Thomas ULg

Conference (2010, May 20)

Detailed reference viewed: 20 (7 ULg)
See detailles stéréotypes sexués à l'adolescence et les enjeux scolaires
Gavray, Claire ULg

Conference (2010, May 19)

Detailed reference viewed: 12 (2 ULg)
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See detailPerte et ressources dans les nouvelles familles: le cas des familles recomposées
D'Amore, Salvatore ULg; Gresse, Karin; Pauss, Véronique

Conference (2010, May 19)

Detailed reference viewed: 19 (2 ULg)
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See detailConclusions : à quelles conditions pouvons-nous travailler ensemble?
Dozo, Björn-Olav ULg; Clavert, Frédéric

Conference (2010, May 19)

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See detailComputational study of the error distribution in right-censored and selection-biased regression models
Laurent, Géraldine ULg; Heuchenne, Cédric ULg

Conference (2010, May 18)

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) =E [Y|X] and σ²(X) = Var [Y|X] are unknown smooth functions and the error Ɛ, with unknown distribution, is independent of X. The pair (X,Y) is ... [more ▼]

Consider the regression model Y = m(X) + σ(X) Ɛ where m(X) =E [Y|X] and σ²(X) = Var [Y|X] are unknown smooth functions and the error Ɛ, with unknown distribution, is independent of X. The pair (X,Y) is subject to generalized selection bias and the response to right censoring. We construct a new estimator for the cumulative distribution function of the error Ɛ, and develop a bootstrap technique to select the smoothing parameter involved in the procedure. The estimator is studied via extended simulations and applied to real unemployment data. [less ▲]

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See detailThe partial proportional odds model in the analysis of
Donneau, Anne-Françoise ULg

Conference (2010, May 18)

Detailed reference viewed: 15 (1 ULg)
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See detailStructuring effects of different lecithins on palm oil-based blends
Danthine, Sabine ULg; Delacharlerie, Sophie ULg; Flöter, Eckhard

Conference (2010, May 18)

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See detailThe occurrence of multicolored ladybird, Harmonia axyridis Pallas, a biological control agent in agroecosystems in Wallonia
Vandereycken, Axel ULg; Durieux, Delphine ULg; Haubruge, Eric ULg et al

Conference (2010, May 18)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted to temperate climate conditions and to spread out all over Europe. Now, H. axyridis is one of the coccinellid with the biggest size in Belgium, causing damages to the ecosystems through e.g. intraguild predation (IGP). We are still lacking information about the consequences of the introduction of this superpredator in our agro-ecosystems. This work focuses on the potential impacts of H. axyridis on the entomofauna associated with several crops (potatos, corn, wheat, broad bean). We evaluated in 2009 the occurrence as well as the interactions between aphids and their natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystem sites in northern Wallonia. After one year of field observations, were found thirteen coccinellid species, most of the catched individuals being H. axyridis with 64% of the coccinellids, Propylea 14-punctata, 15%, or Coccinella 7-punctata, 14%. This invasive ladybird dominates the group of coccinellids generally in all crops in north Wallonia. The results with the sticky traps show that the maximum occurrence of H. axyridis in crops is observed in chicory, sugar beet and potatoes. The relationship aphid-ladybird in wheat for example, brings out that increase of density of Asian ladybird in mid-July follow the increase of aphids (Sitobion avenae, Sitobion fragariae, Metopolophium dirhodum, Aphis fabae) in the end of June. We also observe that, in most agro-ecosystems, hoverflies and lacewings are the dominant aphid natural enemies. In all crops investigate, the multicolored ladybird occurs with 5% of the aphidophagous after the Chrysopidae, 12% and the Syrphidae, 76%. In 2009, the agro-ecosystems with the most aphidophagous species are carrot and broad bean and these habitats are dominated by hoverflies. [less ▲]

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See detailThe modified Reyment's multivariate coefficient of variation
Zhang, Lixin ULg

Conference (2010, May 18)

Detailed reference viewed: 38 (9 ULg)
See detailA l’interface de l’humain et du non-humain : apprendre à être affecté.
Strivay, Lucienne ULg

Conference (2010, May 18)

Detailed reference viewed: 54 (13 ULg)
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See detailAccompagner une réforme vers des programmes visant le développement de compétences – difficultés et leviers –
Poumay, Marianne ULg; Tardif, Jacques

Conference (2010, May 17)

En 2007, au sein de l’Université de Liège, l’IFRES a lancé un programme interne de financement et d’accompagnement de projets facultaires. Dans les projets sélectionnés, les enseignants s’engageaient à ... [more ▼]

En 2007, au sein de l’Université de Liège, l’IFRES a lancé un programme interne de financement et d’accompagnement de projets facultaires. Dans les projets sélectionnés, les enseignants s’engageaient à progresser concrètement dans l’opérationnalisation de formations orientées vers le développement de compétences chez leurs étudiants. A travers ce programme « compétences », l’objectif de l’IFRES était d’amorcer des réformes qui visent l’amélioration de l’apprentissage des étudiants. Suite à la nécessaire description de l’initiative et de quelques résultats concrets, le présent article mentionne brièvement les difficultés d’ordre institutionnel ou organisationnel et s’attarde surtout à déterminer et illustrer des problèmes conceptuels qui se posent dans ce type de réforme. Il mentionne certains freins et facteurs facilitateurs, soulignant entre autres l’intérêt d’un accompagnement semi-collectif par un consultant externe (en l’occurrence Jacques Tardif) et d’une large communication sur les avancées des projets en cours. [less ▲]

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See detailJupiter's and Saturn's auroras as observed by the Hubble Space Telescope
Nichols, J. D.; Grodent, Denis ULg

Conference (2010, May 17)

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See detail3D Modelling of the Black Sea northwestern Shelf Ecosystem
Capet, Arthur ULg; Grégoire, Marilaure ULg

Conference (2010, May 14)

Some validation procedures are presented concerning the physicis and the biology, as well as the decomposition of the oxygen cycle in its different components. The role of the Sevastopol eddy of retaining ... [more ▼]

Some validation procedures are presented concerning the physicis and the biology, as well as the decomposition of the oxygen cycle in its different components. The role of the Sevastopol eddy of retaining POM in the Crimea peninsula causing intense bacterial oxygen consumption is evidenced. [less ▲]

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See detailA paleolimnological study of Lake Kivu (East Africa)
Knops, Sébastien; Darchambeau, François ULg; Verleyen, Elie et al

Conference (2010, May 13)

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See detailAdolescence et délinquances : quand la puberté s’en mêle …De l’intérêt d’une approche biopsychosociale de la délinquance adolescentaire
Glowacz, Fabienne ULg

Conference (2010, May 13)

De nombreuses recherches (Kaltiala-Heino et al., 2003 ; Parent et al., 2003 ; Beaver § Wright, 2005 ; Haynie § Piquero 2006 ; Lynne et al., 2007,..) ont établi ces dernières années un lien entre le ... [more ▼]

De nombreuses recherches (Kaltiala-Heino et al., 2003 ; Parent et al., 2003 ; Beaver § Wright, 2005 ; Haynie § Piquero 2006 ; Lynne et al., 2007,..) ont établi ces dernières années un lien entre le développement pubertaire et l’engagement à l’adolescence dans des comportements délictueux, usage de drogue, conduites sexuelles et autres comportements exploratoires et déviants. Felson et Haynie (2002) affirment que le développement pubertaire a des effets sur différents types de délinquance comparables à d’autres puissants prédicteurs de la délinquance. Bien que l’étude de Williams et Dunlop (1999) constate que les garçons à maturité précoce et tardive présentent des taux plus élevés de délinquance que leurs pairs à maturation normale, des recherches plus récentes (Ge et al., 2002 ; Beaver § Wright, 2005 ; Michaud et al., 2006 ; Lynne et al., 2007…) soutiennent l’hypothèse de la précocité pubertaire en tant que facteur de risque : les garçons à puberté précoce ont un plus haut niveau d’engagement dans des comportements délinquants et agressifs, alors que les garçons à puberté tardive s’engagent dans moins de délinquances (de type crime, violence, atteintes aux biens, usage de drogue). La délinquance sexuelle juvénile, au croisement de la délinquance et de la sexualité, incite à un questionnement sur les effets de la puberté au niveau des conduites sexuelles déviantes. Notre recherche « Adolescence, délinquances et processus pubertaire » portant sur un échantillon de 316 adolescents âgés de 13 à 18 ans, a notamment évalué l’incidence du timing pubertaire au niveau de l’adoption de conduites délinquantes sexuelles et non sexuelles. Nos résultats confirment la pertinence de la prise en compte du développement pubertaire dans les processus de socialisation et d’engagement dans la délinquance générale et/ou sexuelle à l’adolescence. [less ▲]

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See detailvandaliser à l'adolescence
Gavray, Claire ULg; vettenburg, Nicole

Conference (2010, May 13)

The personal factor which explain vandalism amongst adolescents differ according to gender group. In the male group, we find an important impact of the valuation of violence and of the feeling of social ... [more ▼]

The personal factor which explain vandalism amongst adolescents differ according to gender group. In the male group, we find an important impact of the valuation of violence and of the feeling of social and statutory victimisation. In the female group, we find track of early victimisation in the family and the other spheres. [less ▲]

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See detailQualité de vie en oncologie pédiatrique : analyse comparative d’enfants en et hors traitements au moyen d’un outil modulaire
Missotten, Pierre ULg; Dupuis, Gilles; Hoyoux, Claire et al

Conference (2010, May 12)

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See detailAbsorbing layers for shallow water models
Modave, Axel ULg; Deleersnijder, Eric; Delhez, Eric ULg

Conference (2010, May 11)

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See detailL’utilisation de la carte mentale en science politique : pertinence et limites
Breux, Sandra; Reuchamps, Min ULg; Loiseau, Hugo

Conference (2010, May 10)

In this presentation, we offer insight about the use of mental map in political science

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See detailDe Paepe-Willems Award 2010: Optimization and analysis of lock gates in the framework of the Seine-Escaut Est waterway upgrading
Gernay, Thomas ULg

Conference (2010, May 10)

This paper presents a research study performed lock gates. It concerns the downstream lock gates of the one of the four new locks planned within the framework of the “Seine-Escaut Est (SEE)” project in ... [more ▼]

This paper presents a research study performed lock gates. It concerns the downstream lock gates of the one of the four new locks planned within the framework of the “Seine-Escaut Est (SEE)” project in the Walloon Region of Belgium. At the stage of the basic preliminary design, it was decided to use four identical gates, all suspended and manoeuvred by lateral movement. On this basis, the present work tackles with different aspects of the lock gate study. The aim is double: on one hand, to advance in the study of the solution of the four downstream lock gates of the SEE project, and the other hand, to concentrate more particularly on the lock gate analysis, among which their design, optimization and structural behavior in the case of ship impact. We began with the design and optimization of the gate. This work was realized with the LBR5 lock gate optimization software, according to a method comparing a representative number of optimized solutions considering at the same time the cost and weight aspects of the structure. This method leaded to an optimized solution of the downstream gate on which further studies are concentrated. Indeed this optimized gate was modeled with the non linear finite elements software FINELG. This program was used to conduct a non linear numerical analysis of the effect of a boat impact on the downstream gate. Several analyses were performed that allowed us to discuss on the influence of the stiffener dimensions and the influence of the impact zone on the gate structural behavior submitted to the impact. Two different behaviors have been brought to light, a ductile one and a fragile one. The results of the numerical analysis with finite elements have underlined the importance of the development of a global plastic mechanism with the purpose of dissipating a large amount of energy. Finally, we have used an analytical model to calculate the gate theoretical strength in a case of a ship impact, and to compare this value with the FEM numerical analysis results. [less ▲]

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See detail« Dessinez la Belgique » : une approche par carte mentale du fédéralisme belge
Flaba, Elodie ULg; Grandjean, Geoffrey ULg; Reuchamps, Min ULg

Conference (2010, May 10)

In this communication, we present how useful can mental maps be in political science through the example of the research "Draw Belgium".

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See detailVers un apprentissage subquadratique pour les mélanges d’arbres
Schnitzler, François ULg; Leray, Philippe; Wehenkel, Louis ULg

Conference (2010, May 10)

We consider randomization schemes of the Chow-Liu algorithm from weak (bagging, of quadratic complexity) to strong ones (full random sampling, of linear complexity), for learn- ing probability density ... [more ▼]

We consider randomization schemes of the Chow-Liu algorithm from weak (bagging, of quadratic complexity) to strong ones (full random sampling, of linear complexity), for learn- ing probability density models in the form of mixtures of Markov trees. Our empirical study on high-dimensional synthetic problems shows that, while bagging is the most accurate scheme on average, some of the stronger randomizations remain very competitive in terms of accuracy, specially for small sample sizes. [less ▲]

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See detailLe(s) génocide(s) vu(s) par des jeunes : représentations et localisations
Grandjean, Geoffrey ULg

Conference (2010, May 10)

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See detailPoor managerial competences: three typical failure patterns for small firms
Crutzen, Nathalie ULg; Van Caillie, Didier ULg

Conference (2010, May 10)

After an in-depth review of the scientific literature dedicated to (small) business failure causes (Crutzen and Van Caillie, 2008), it comes out that mismanagement is, by far, the failure cause which is ... [more ▼]

After an in-depth review of the scientific literature dedicated to (small) business failure causes (Crutzen and Van Caillie, 2008), it comes out that mismanagement is, by far, the failure cause which is the most commonly evoked by previous researchers (Argenti, 1976; Wichman, 1983; Newton, 1985; O'Neill and Duker, 1986; Thornhill and Amit, 2003). Nevertheless, the concept of « mismanagement » is relatively vague and large (Bruno et al., 1987; Sheldon, 1994). It is thus now necessary to clarify it if one wants to better understand the causes of small business failure and, in fine, to better prevent this phenomenon (Argenti, 1976). In particular, it is essential to distinguish between the main categories of managerial problems small businesses can be faced to in order to be able to better anticipate their failure (thanks to adequate trainings, for example) and in order to propose adequate remedies to specific managerial problems small distressed firms are confronted to. In this context, the current article identifies, on the basis of two complementary statistical analyses, three specific patterns for badly-managed firms, amongst a sample of 91 small distressed firms. [less ▲]

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See detailLe ralentissement de la progression de l'insuffisance rénale chronique
Krzesinski, Jean-Marie ULg

Conference (2010, May 10)

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See detailIntérêt du trajet de soins en néphrologie
Krzesinski, Jean-Marie ULg

Conference (2010, May 09)

Detailed reference viewed: 12 (5 ULg)
See detailHypertension durant la grossesse
Krzesinski, Jean-Marie ULg

Conference (2010, May 08)

Detailed reference viewed: 13 (1 ULg)
See detailMémoire(s) en question(s) : la transmission entre monopole et concurrence
Vanesse, Marc ULg

Conference (2010, May 07)

Colloque sur les difficultés rencontrées par les scientifiques pour transmettre certains épisodes douloureux de l'histoire (Holocauste, génocides, guerres) et la concurrence qui peut exister entre ... [more ▼]

Colloque sur les difficultés rencontrées par les scientifiques pour transmettre certains épisodes douloureux de l'histoire (Holocauste, génocides, guerres) et la concurrence qui peut exister entre certains gardiens de la mémoire. [less ▲]

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See detailLa concurrence mémorielle
Grandjean, Geoffrey ULg

Conference (2010, May 07)

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See detailLe ralentissement de la progression de l'insuffisance rénale chronique
Krzesinski, Jean-Marie ULg

Conference (2010, May 06)

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See detailComparison between in situ and satellite surface temperature in the Western Mediterranean Sea
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Troupin, Charles ULg et al

Conference (2010, May 06)

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is realised. The aim of this study is to better understand the differences between ... [more ▼]

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is realised. The aim of this study is to better understand the differences between these two data sets, in order to realise merged maps of SST using satellite and in situ data. When merging temperature from different platforms, it is crucial to take the expected RMS error of the observations into account and to correct for possible biases. Advanced Very High Resolution Radiometer (AVHRR) SST day-time and night-time satellite data are used, and the in situ data have been obtained from various databases (World Ocean Database’05, Coriolis, Medar/Medatlas and ICES). Statistics about the differences due to the hour of the day, the month of the year, the type of sensor/platform used (CTD, XBT, drifter, etc) and the spatial distribution are made using a combination of error measures, diagrams and statistical hypothesis testing. In addition to quantify the errors between different platforms, several assumptions often made when creating gridded analyses will be critically reviewed: unbiased data sets, non-correlated errors of the observations, spatially uniform variance, and Gaussian-distributed data. [less ▲]

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See detailAuroral footprints; everywhere
Grodent, Denis ULg; Bonfond, Bertrand ULg; Radioti, Aikaterini ULg et al

Conference (2010, May 06)

Jupiter’s moons Io, Europa and Ganymede are continuously interacting with the Jovian magnetic field and with the sheet of plasma flowing near its equatorial plane. The interaction between these moons and ... [more ▼]

Jupiter’s moons Io, Europa and Ganymede are continuously interacting with the Jovian magnetic field and with the sheet of plasma flowing near its equatorial plane. The interaction between these moons and the Jovian magnetosphere causes strong Alfvénic perturbations which propagate along the magnetic field lines. On their way towards Jupiter’s polar regions, these perturbations accelerate charged particles which then interact with Jupiter’s ionosphere where they loose a fraction of their energy in the form of auroral emissions. Each of the three moons leaves an auroral footprint around the poles of Jupiter which departs from the bulk of the auroral emission. Their location is mainly controlled by the topology of the field lines and thus analysis of the auroral footprints provides information on the magnetic field itself. In that regard, the satellites auroral footpaths were used to highlight the presence of a strong magnetic anomaly in the northern hemisphere of Jupiter. Detailed inspection of the footprints’ brightness and morphology as a function of time reveals fundamental information on the interaction mechanisms near the moons, on the particles acceleration mechanisms as well as on the Jovian ionosphere. For example, it was suggested that the Io footprint actually consists of several spots resulting from successive steps in the perturbation propagation process. Another example is the finding of three different timescales in the variations of Ganymede’s footprint; each of them is pointing to a different part of the electromagnetic interaction between the moon’s mini-magnetosphere and the Jovian plasma. Several recent images of Saturn’s auroral regions obtained with Cassini/UVIS at high latitude show an obvious auroral spot at the predicted location of Enceladus’ footprint. This major finding demonstrates that the electromagnetic interaction between a moon and its parent planet is not unique to Jupiter but appears to be a common feature in planetary systems. [less ▲]

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See detailChallenging Combinatorial Problems
Crama, Yves ULg

Conference (2010, May 06)

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See detailMonitoring the ionospheric positioning error with a GNSS dense network
Wautelet, Gilles ULg; Lejeune, Sandrine; Warnant, René ULg

Conference (2010, May 06)

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See detailTraduire les effets de rupture: le style de Céline en italien
Benzoni, Pietro ULg

Conference (2010, May 06)

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See detailDual Citizenship and Home-country Voting
Lafleur, Jean-Michel ULg

Conference (2010, May 05)

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See detailHow do insects communicate with a cadaver?
Dekeirsschieter, Jessica ULg; Verheggen, François ULg; Frederickx, Christine ULg et al

Conference (2010, May 05)

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See detailL’édition littéraire en Belgique au passé et au présent
Durand, Pascal ULg; Habrand, Tanguy ULg

Conference (2010, May 05)

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See detailBiosensors in Forensic Sciences
Frederickx, Christine ULg; Verheggen, François ULg; Haubruge, Eric ULg

Conference (2010, May 05)

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See detailOccurrence of the multicolored ladybird, Harmonia axyridis PALLAS in Walloon agro-ecosystems
Vandereycken, Axel ULg; Durieux, Delphine ULg; Joie, Emilie ULg et al

Conference (2010, May 05)

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted ... [more ▼]

The Asian ladybird, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), was imported in 1997 in Belgium to control aphid populations in greenhouses. It took only few years to the insect to get adapted to temperate climate conditions and to spread out all over Europe. Now, H. axyridis is one of the coccinellid with the biggest size in Belgium, causing damages to the ecosystems through e.g. intraguild predation (IGP). We are still lacking information about the consequences of the introduction of this superpredator in our agro-ecosystems. This work focuses on the potential impacts of H. axyridis on the entomofauna associated with several crops (potatos, corn, wheat, broad bean). We evaluated in 2009 the occurrence as well as the interactions between aphids and their natural enemies (hoverflies, coccinellids and lacewings) in several agro-ecosystem sites in northern Wallonia. After one year of field observations, were found thirteen coccinellid species, most of the catched individuals being H. axyridis with 64% of the coccinellids, Propylea 14-punctata, 15%, or Coccinella 7-punctata, 14%. This invasive ladybird dominates the group of coccinellids generally in all crops in north Wallonia. The results with the sticky traps show that the maximum occurrence of H. axyridis in crops is observed in chicory, sugar beet and potatoes. The relationship aphid-ladybird in wheat for example, brings out that increase of density of Asian ladybird in mid-July follow the increase of aphids (Sitobion avenae, Sitobion fragariae, Metopolophium dirhodum, Aphis fabae) in the end of June. We also observe that, in most agro-ecosystems, hoverflies and lacewings are the dominant aphid natural enemies. In all crops investigate, the multicolored ladybird occurs with 5% of the aphidophagous after the Chrysopidae, 12% and the Syrphidae, 76%. In 2009, the agro-ecosystems with the most aphidophagous species are carrot and broad bean and these habitats are dominated by hoverflies. [less ▲]

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See detailThe chemical ecology of ladybird beetles
Durieux, Delphine ULg; Verheggen, François ULg; Vandereycken, Axel ULg et al

Conference (2010, May 05)

Ladybird beetles (Coleoptera: Coccinellidae) use a wide variety of semiochemicals to communicate with each other, e.g. finding a mate, protecting themselves from predation or cannibalism, finding a ... [more ▼]

Ladybird beetles (Coleoptera: Coccinellidae) use a wide variety of semiochemicals to communicate with each other, e.g. finding a mate, protecting themselves from predation or cannibalism, finding a shelter to overwinter or ensuring a better survival for their offspring. But chemical communication upon ladybeetles has also found recently to occur with their prey, their prey-host plants and even within their interactions with their natural enemies. Thorough studies on ladybird behaviours towards these compounds could lead to their practical implementation in integrated strategies using ladybirds to control pests, like aphids or mealybugs. [less ▲]

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