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See detailLa sexologie clinique en Belgique
Kempeneers, Philippe ULg

Conference (2006, October 07)

Le point sur la formation et la reconnaissance légale des sexologues et des sexologues cliniciens en belgique (2006)

Detailed reference viewed: 95 (2 ULg)
Peer Reviewed
See detailL'accompagnement dans Formasup
Poumay, Marianne ULg

Conference (2006, October 06)

Detailed reference viewed: 17 (3 ULg)
Peer Reviewed
See detailMeasuring a conceptual model of military turnover.
Bertrand, Françoise ULg; Schreurs, B.; Lescreve, F. J. et al

Conference (2006, October 05)

Detailed reference viewed: 14 (1 ULg)
See detailPrésentation du futur tome 17 de l'ALW
Baiwir, Esther ULg

Conference (2006, October 04)

Detailed reference viewed: 8 (1 ULg)
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See detailDie Frage nach der Identität: Uwe Johnson und Max Frisch
Letawe, Céline ULg

Conference (2006, October 02)

Detailed reference viewed: 22 (2 ULg)
Peer Reviewed
See detailProtocols for building an Organic Chemical Ontology
Colaux, Catherine ULg

Conference (2006, October)

Detailed reference viewed: 3 (0 ULg)
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See detailDownscaling of ECMWF grid meteorological data : comparison with ground stations and validation
Tychon, Bernard ULg; Horion, Stéphanie

Conference (2006, October)

CGMS currently operates on observed station data. Switching from this classical approach to a modelled data from European Centre for Medium-range Weather Forecast, ECMWF, has to be tested before applying ... [more ▼]

CGMS currently operates on observed station data. Switching from this classical approach to a modelled data from European Centre for Medium-range Weather Forecast, ECMWF, has to be tested before applying it operationally. In this study, we concentrated on the impact of the downscaling of meteorological data with grid sizes ranging from 1.875 to 0.35 degrees to the new CGMS grid size of 25 X 25 km. Four different grid sizes corresponding respectively to the dimensions of the Operational, EPS, Monthly and Seasonal ECMWF Models were checked. The control was done on daily data of 25 stations selected on a 2-year period in a window covering the South of Germany and Czech Republic, a large part of Austria and the North of Italia in order to analyse the downscaling impact on plains, mountainous and coastal zones. For each grid size, four different downscaling methods were applied: the reference method that uses the classical CGMS interpolation procedure, the nearest neighbour approach, and two more complicated interpolation techniques using the Model Output Statistics developed by Meteo Consult (MC-MOS). The analysis showed that the accuracy of the downscaling procedure is largely influenced by the input data grid size. RMSE increases between the smallest and the largest grids are respectively 59%, 51%, 33%, and 33% for Tmax, Tmin, Wind Speed and Radiation fields. Rainfall does not seem to be affected by the downscaling process but the RMSE is high in all cases. In most cases, the best interpolation method is also the more complex one and the one that requires more computer time to be calculated. RMSE decrease of 22%, 50%, 57% and 28% respectively for Tmax, Tmin, Wind speed and Radiation fields when we compare the best interpolation method results with the reference approach. An exception in this general rule is for the rainfall rate estimation whose accuracy is not always best with the most complex interpolation technique. [less ▲]

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See detailRethinking Flexicurity at the work situations level
Pichault, François ULg; Xhauflair, Virginie ULg

Conference (2006, October)

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See detailThe B-CGMS project : evaluation after 5 years of monitoring and prediction
Curnel, Y.; Oger, Robert ULg; Leteinturier, B. et al

Conference (2006, October)

The B-CGMS project, started in 1998, is the adaptation to Belgian Conditions of the European Crop Growth Monitoring System (CGMS). This project involved 3 Belgian scientific institutes: the Walloon ... [more ▼]

The B-CGMS project, started in 1998, is the adaptation to Belgian Conditions of the European Crop Growth Monitoring System (CGMS). This project involved 3 Belgian scientific institutes: the Walloon agricultural research Centre (CRA-W), the Flemish Institute for Technological Research (VITO) and the University of Liège (ULg). The main difference with the European system is that more detailed inputs (meteorological, soil and NUTS inputs) are used. Crop yields predictions are realised on a monthly basis during the growing season (from April to September) for 6 crops (winter wheat, winter barley, maize, Potato, sugar beet, winter rapeseed). Yields predictions as well as analyses of meteorological situation of the month and RS information on the state of the crops are published in agrometeorological bulletins sent by e-mail since 2002. The information is also available on the Internet website of the project (http://.b-cgms.cra.wallonie.be). Crop yields predictions are produced through a combination of linear regression models which may include different categories of yield indicators (trend, meteo, RS and agrometeorological model outputs). Crop yields predictions procedure is currently semi-automated by the use of a statistical calibration toolbox (StatCaT). The evaluation of the project after 5 years of monitoring and prediction has first shown that final yields predicted B-CGMS as well as the ones predicted by MARS are coherent compared with official yields: no significant differences are observed. As far as the accuracy according to the month for which the prediction is made is concerned, we can notice that at agricultural circumscriptions level and for winter crops a lower precision of B-CGMS is observed before June and that there is no improvement in July (in comparison with June). The same evolution is observed for summer crops before July but in August and September, the prediction accuracy decreases. Even if calibration models present high adjusted coefficient of determination, the technological trend explains an important part of the variability and it is therefore necessary to consider the effect of a year factor on the quality of prediction in order to clearly the interest of the agrometeorological model. For some crops (as potato), adding agrometeorological yield outputs to models including already the technological trend allow to improve the quality of prediction especially for “extreme” year i.e. years where official yields move away significantly from the technological trend. For others crops as winter wheat, this improvement of the quality of prediction is not observed. However, fortunately, adding other yield indicators as meteo indicators can improve in general the quality of prediction and once again especially for “extreme” years. [less ▲]

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See detailStrutural properties of bounded languages with respect to multiplication by a constant
Charlier, Emilie ULg

Conference (2006, October)

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative ... [more ▼]

We consider the preservation of recognizability of a set of integers after multiplication by a constant for numeration systems built over a bounded language. As a corollary we show that any nonnegative integer can be written as a sum of binomial coefficients with some prescribed properties. [less ▲]

Detailed reference viewed: 17 (3 ULg)
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See detailSyntactictal and automatic properties of sets of polynomials over finite fields
Rigo, Michel ULg

Conference (2006, October)

Detailed reference viewed: 6 (1 ULg)
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See detailMonitoring of the crop water stress in Belgium. The case of the 2003 heat wave.
Horion, Stéphanie; Tychon, Bernard ULg; de Longueville, Florence

Conference (2006, October)

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized ... [more ▼]

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized Difference Vegetation Index, [NDVI] applied on S10 SPOT-VGT imagery, (iii) the Normalized Difference Water Index, [NDWI] applied on S10 SPOT-VGT imagery. The RSMI is one of the outputs of the Belgian Crop Growth Monitoring System. It indicates the soil water availability for crops. Crop water stress is assumed when soil water availability is lower than the crop potential evapotranspiration. One of the potential applications for drought monitoring is the calculation of the number of days with a crop water stress during the growing season or more precisely during the “moisture-sensitive period” of the crop. The two others (well-known) indices are derived from low resolution satellite imagery. Complete time series of S10 SPOT-VGT NDVI and NDWI data - i.e. from April 1998 onwards – have been acquired for the research. Using spatial information on land-uses in Belgium, a simple unmixing method is implemented to partly reduce the problem of mixed values occurring inevitably in 1x1km² pixels. Only the most agricultural pixels are considered for the analysis. The heat wave occurred during the summer 2003 has been chosen as a study case for the comparison. This summer was particularly hot, dry and sunny with the highest averaged temperature ever recorded from June to August in Uccle-Belgium. Many human activities were affected by this particular climatic condition, among which agriculture. In order to make the comparison possible, a standardization of the outputs of the 3 indexes is realised, taking into account the times series of each indexes. Moreover all the outputs are aggregated at municipality level. [less ▲]

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See detailImpact de l'apprentissage de la lecture et de l'écriture en anglais sur l'acquisition ultérieure de la lecture et de l'orthographe en français chez les enfants francophones immergés en anglais
Nicolay, Anne-Catherine ULg; Fantauzzi, A.; Comblain, Annick ULg et al

Conference (2006, October)

Apprendre à lire dans une langue n’interfère pas avec l’apprentissage de la lecture dans une autre langue mais prépare plutôt le terrain pour apprendre à lire dans une autre langue. Comme dans le langage ... [more ▼]

Apprendre à lire dans une langue n’interfère pas avec l’apprentissage de la lecture dans une autre langue mais prépare plutôt le terrain pour apprendre à lire dans une autre langue. Comme dans le langage oral, il peut y avoir quelques « mixing » de prononciation au niveau des mots qui disparaissent progressivement au fur et à mesure que les langues se compartimentalisent. Avec le temps, l’enfant apprendra également que des mots qui s’écrivent de la même manière dans les deux langues peuvent se prononcer de manière différente. Une recherche menée sur des enfants francophones Belges suivant un programme d’immersion scolaire en anglais et ayant appris à lire en anglais confirment ces observations. 150 enfants âgés de 7 à 12 ans fréquentant ce programme ont été testés sur leurs compétences en lecture du français (décodage et compréhension). Leurs performances (type et nombre d’erreurs, vitesse de lecture) ont été comparées à celles d’enfants francophones fréquentant un enseignement unilingue. Leurs habiletés métaphonologiques (manipulation de la rime et du phonème) ont également été testées. [less ▲]

Detailed reference viewed: 120 (23 ULg)
Peer Reviewed
See detailLes femmes entrepreneures et la transmission d’entreprise
Constantinidis, Christina ULg; Cornet, Annie ULg

Conference (2006, October)

Detailed reference viewed: 57 (9 ULg)
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See detailBuilding the EnCOrE dictionare collaboratively: Strategy and Practice
Colaux, Catherine ULg

Conference (2006, October)

Detailed reference viewed: 3 (2 ULg)
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See detailVilles et Villages en Santé/Villes Santé face à la multiplication des politiques et des stratégies intersectorielles locales: les chemins de la cohérence
Brunet, Sébastien ULg

Conference (2006, October)

Malgré toute la modernité qui caractérise nos sociétés, nombre de phénomènes paraissent encore et toujours en attente de politiques et d’actions adéquates et concertées. La santé n’échappe évidemment pas ... [more ▼]

Malgré toute la modernité qui caractérise nos sociétés, nombre de phénomènes paraissent encore et toujours en attente de politiques et d’actions adéquates et concertées. La santé n’échappe évidemment pas à cette situation, et ce malgré, les préoccupations croissantes en la matière. La difficulté est d’autant plus insurmontable que la santé représente un domaine d’investigation gigantesque où se croisent, si l’on adopte la définition de l’OMS1, une myriade d’acteurs de terrain en prise avec une quantité potentiellement illimitée de dimensions influençant la santé. Si les conditions de vie semblent s’améliorer dans un certain nombre de pays, on peut regretter que ce constat ne puisse être étendu à l’ensemble de la planète. L’objectif poursuivi par les pays fondateurs de l’OMS en 1946 d’atteindre le plus haut niveau de santé pour l’ensemble des individus, reste donc encore et toujours devant nous.Si tout le monde sait que la santé ne se décrète pas, personne ne niera que la santé est le fruit de la rencontre de « circonstances » qui sont par contre produites par nos sociétés. Les pouvoirs publics ont, dans ce contexte, une part de responsabilité indéniable. Plus précisément, les mandataires publics ont pour mission, à tout le moins dans les systèmes politiques démocratiques, d’assurer à l’ensemble de la population, des conditions de vie acceptables. Si l’on concentre son attention sur les pays les plus favorisés, on se rend compte de l’existence d’un certain nombre de difficultés pour une gestion cohérente et efficace de la santé. [less ▲]

Detailed reference viewed: 43 (9 ULg)
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See detailMonitoring of the crop water stress in Belgium. The case of the 2003 heat wave.
Horion, Stephanie; Tychon, Bernard ULg; de Longueville, Florence

Conference (2006, October)

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized ... [more ▼]

In this paper the crop water stress is evaluated with three different indices: (i) the Relative Soil Moisture Index [RSMI] resulting from agrometeorological model simulations, (ii) the Normalized Difference Vegetation Index, [NDVI] applied on S10 SPOT-VGT imagery, (iii) the Normalized Difference Water Index, [NDWI] applied on S10 SPOT-VGT imagery. [less ▲]

Detailed reference viewed: 9 (2 ULg)
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See detailGreen leaf area decline of wheat top three leaves in Belgium and G-D of Luxembourg from 2003 to 2006 : the relationships with grain yield.
Martin, B.; Tychon, Bernard ULg; El Jarroudi, Moussa ULg et al

Conference (2006, October)

The modified Gompertz model developed by Gooding et al. (2000) was used to describe the decline in green area of wheat top three leaves in field experiments where green leaf area at time t = 100*exp[-exp ... [more ▼]

The modified Gompertz model developed by Gooding et al. (2000) was used to describe the decline in green area of wheat top three leaves in field experiments where green leaf area at time t = 100*exp[-exp(-k*(t-m))]. In the absence of fungicide, green leaf area decline was associated with drought or infection with a number of foliar pathogens including Septoria tritici (sexual stage Mycospherella graminicola) and Puccinia recondita f.sp. tritici and Erysiphe graminis. On the whole experiments and cultivars there was no effect of fungicide on k but it was highly significant on m (P<0.001). When main effects are considered, fungicide delayed green leaf area decline rather than reduced its rate of progress once started. Fungicide had variable effects on grain yield, largely reflecting variation in disease infection pressures in the different years and susceptibility of the different cultivars. If no correlation was observed between k values and grain yields, m was at the contrary very closely associated with grain yields. This study supports the view of Gooding (2000) and Gaunt (1995) that, for many diseases, effects on green area duration give an adequate estimate of host yield reduction. Therefore we have use the close relationship between the parameter m of the Gompertz model and grain yield to improve the Belgium-Crop Growth Monitoring System (B-CGMS) by recalibrating LAI evolution simulated by B-CGMS according to the evolution of LAI derived from the Gompertz model. The system includes indeed a component allowing taking into account senescence in the evolution of LAI during the growing season. Recalibration has been realized through the modification of one of the parameters influencing the leaf senescence, the SPAN parameter. Modifying the SPAN parameter comes down to modify the lifespan of leaves. Considering that parasitic pressure reduces leaves lifespan and therefore the photosynthetic capacity, this approach makes it possible to take into account the influence of this pressure on yield predictions in the Belgian Crop Growth Monitoring System. [less ▲]

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See detailEmpirical regression models using NDVI, rainfall and temperature data for the early prediction of wheat grain yields in Morocco
Balaghi, Riad; Tychon, Bernard ULg; Eerens, H. et al

Conference (2006, October)

In Morocco, no operational system actually exists for the early prediction of the grain yields of bread wheat. This study proposes empirical Ordinary Least Squares regression models to forecast the yields ... [more ▼]

In Morocco, no operational system actually exists for the early prediction of the grain yields of bread wheat. This study proposes empirical Ordinary Least Squares regression models to forecast the yields at provincial and national levels. The predictions were based on dekadal (10-daily) NDVI/AVHRR, dekadal rainfall sums and average monthly air temperatures. The global land cover map GLC2000 was used to select only the NDVI pixels that are related to agricultural lands. Provincial yields were assessed with errors varying from 80 to 762 kg.ha-1, depending on the province. At national level, yield was predicted at the third dekad of April with 73 kg.ha-1 error, using NDVI and rainfall. However, earlier forecasts are possible, starting from the second dekad of March with 84 kg.ha-1 error. At the province and country levels most of the yield variation was accounted for by NDVI. The proposed models can be used in an operational context to forecast bread wheat yields in Morocco. [less ▲]

Detailed reference viewed: 27 (2 ULg)
See detailNumerical and experimental research in river hydrodynamics and hydraulic engineering
Dewals, Benjamin ULg

Conference (2006, September 29)

Detailed reference viewed: 5 (1 ULg)
See detailMacromolecular engineering of cyclic aliphatic polyesters by ring-opening polymerization
Lecomte, Philippe ULg; Riva, Raphaël ULg; Li, Haiying et al

Conference (2006, September 24)

Detailed reference viewed: 7 (3 ULg)
See detailUrban regeneration: a North-West Europe perspective
Halleux, Jean-Marie ULg

Conference (2006, September 19)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailMeasuring and comparing the equity of educational systems in Europe
Baye, Ariane ULg; Demeuse, Marc

Conference (2006, September 15)

Detailed reference viewed: 11 (0 ULg)
See detailCorps à corps. Détournement et recyclage : Cinéma, art contemporain
Thonon, Jonathan ULg

Conference (2006, September 15)

Detailed reference viewed: 10 (1 ULg)
Peer Reviewed
See detailLe rôle des pays de l’Est dans l’Europe à venir
Gyemant, Maria ULg

Conference (2006, September 13)

Detailed reference viewed: 4 (2 ULg)
See detailFormation de radicaux anions d'ADN par irradiation laser UV et visible et nouveaux canaux de dissociation
Gabelica, Valérie ULg; Tabarin, Thibault; Kinet, Catherine ULg et al

Conference (2006, September 13)

Nous avons exploré récemment les effets de l'irradiation laser dans l'UV ou le visible de polyanions d'ADN dans un piège à ions quadripolaire. Lors de l'irradiation de simple brins ou de double hélices d ... [more ▼]

Nous avons exploré récemment les effets de l'irradiation laser dans l'UV ou le visible de polyanions d'ADN dans un piège à ions quadripolaire. Lors de l'irradiation de simple brins ou de double hélices d'ADN en UV autour de 260 nm, nous avons observé un détachement d'électrons, donnant lieu à des radicaux anions. L'étude de la dépendence de l'efficacité de ce photodétachement d'électrons en fonction de la séquence des brins a révélé que ce phénomène était corrélé au potentiel d'ionisation des bases nucléiques. La guanine est la base la plus facilement oxydée, suivie de l'adénine, de la cytosine et de la thymine. En pratique, plus un brin contient de guanines, plus la formation de radicaux par photodétachement d'électrons est efficace. L'efficacité du photodétachement montre également une dépendence envers l'état de charge du brin (les plus chargés ont une efficacité de détachement plus élevée) et en fonction de la longueur d'onde (avec un maximum d'efficacité autour de 265 nm), montrant que la transition vers un état électronique excité des bases facilite le détachement d'électrons. Plus surprenant encore, des complexes avec des chromophores (ligands du sillon de l'ADN et intercalants) montrent également un photodétachement d'électrons, et ce avec des énergies de photons encore plus basses, correspondant à une absorption dans le visible (i.e. 550 nm pour l'éthidium). Ceci montre que les énergies de liaisons des électrons sont relativement faibles, puisqu'ils peuvent être détachés par des photons de 2.25 eV. Nous avons également étudié la fragmentation des radiaux ainsi produits, par CID dans le piège. Dans le cas des complexes avec les chromophores, les canaux de fragmentation principaux sont des pertes de neutres, y compris des morceaux de ligands. Il est intéressant de constater que les radicaux se fragmentent de la même manière, quel que soit le chromophore irradié qui a donné lieu à sa formation. Cecis suggère que les radicaux se réorganisent rapidement par rapport au temps de l'expérience. Dans le cas de simples brins (12-mères à 20-mères), nous avons constaté une fragmentation plus efficace des radicaux comparés aux ions à couches complètes de même charge. Plus intéressant, les canaux de dissociation sont très particuliers : alors que la CID sur ions à couches complètes donne majoritairement des ions 'w' et 'a-Base', la CID sur les radicaux donne des ions 'w', 'd', 'a radicalaires', et 'z radicalaires'. Il est aisé d'obtenir une bonne couverture de séquence à des énergies de collision faibles. A nouveau, bien que le détachement d'électrons soit initié par les bases guanines, la couverture de séquence est indépendante de la composition, suggérant une redistribution dans les radicaux. L'avantage principal de la fragmentation des radicaux est l'absence de fragments internes (ou 'double fragments'), ce qui facilite le séquencage de novo. De plus, selon notre expérience, la formation des radicaux est plus aisée par irradiation laser que par EDD. [less ▲]

Detailed reference viewed: 23 (0 ULg)
See detailPrévention des infections périnatales à streptocoques du groupe B : Recommandations
MELIN, Pierrette ULg

Conference (2006, September 08)

Detailed reference viewed: 6 (3 ULg)
Peer Reviewed
See detailThe photosynthetic electron transport network: occurrence and function of cyclic and side pathways
Franck, Fabrice ULg

Conference (2006, September 07)

The current knowledge on cyclic and side pathways of the thylakoidal electron transport system will be discussed. Cyclic or pseudo-cyclic pathways include the PSI-driven cyclic electron transport, the ... [more ▼]

The current knowledge on cyclic and side pathways of the thylakoidal electron transport system will be discussed. Cyclic or pseudo-cyclic pathways include the PSI-driven cyclic electron transport, the cytochrome b6/f plastoquinone cycle and the oxygen-dependent water/water cycle. Side pathways altogether make up the chlororespiratory pathway, including the non-photochemical, NAD(P)H-dependent plastoquinone reduction by chloroplastic dehydrogenases and plastoquinol oxidation by a putative chloroplastic oxidase. The state of knowledge concerning the components, the importance and function of these pathways will be discussed. Results obtained in Liège using the unicellular green alga Chlamydomonas reinhardtii or higher plant chloroplasts will be presented. The importance of specific pathways in the context of mitochondria-chloroplast metabolic interactions and global cellular bio-energetics will be highlighted. Some of the methodological aspects in this field will be shortly described, in particular the use of fluorescence and absorbance spectroscopy. In some micro-algae, the electron transport chain can also use protons as terminal electron acceptors under anaerobic conditions, thereby allowing hydrogen evolution in the light. The potential of this fascinating reaction in perspective of the photobiological production of ‘bio-hydrogen’ will be briefly discussed. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Peer Reviewed
See detailLe rapport à la langue/aux langues dans les dialectes de Wallonie
Baiwir, Esther ULg

Conference (2006, September 05)

Detailed reference viewed: 14 (0 ULg)
Peer Reviewed
See detailNew functional polyvinylacetate and polyvinylalcohol architectures
Detrembleur, Christophe ULg

Conference (2006, September 04)

Detailed reference viewed: 5 (0 ULg)
See detailVarious applications of X-ray microtomography in chemical engineering
Léonard, Angélique ULg; Blacher, Silvia ULg; Lodewyckx, Peter et al

Conference (2006, September)

Detailed reference viewed: 12 (2 ULg)
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See detailProduction lamellaire aurignacienne à Mitoc-Malu Galben, Roumanie
Noiret, Pierre ULg; Zwyns, Nicolas; Chirica, Vasile

Conference (2006, September)

Although retouched bladelets (Dufour or others) were not recovered, the Aurignacian assemblages from Mitoc-Malu Galben (Romania) probably belongs to the Krems-Dufour type Aurignacian. In the lithic ... [more ▼]

Although retouched bladelets (Dufour or others) were not recovered, the Aurignacian assemblages from Mitoc-Malu Galben (Romania) probably belongs to the Krems-Dufour type Aurignacian. In the lithic material gathered by V. chirica in the 1980s, evidence indicates the existence of bladelet production from carinated tools/cores. A small unpublished lithic assemblage from the 1990s excavations, associated with a hearth, confirms this hypothesis. The operational schemes are described and compared to those from the western and eastern Aurignacian geographic regions. [less ▲]

Detailed reference viewed: 62 (0 ULg)
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See detailL'impact de tests traduits sur les performances des élèves
Baye, Ariane ULg; Lafontaine, Dominique ULg

Conference (2006, September)

Detailed reference viewed: 5 (0 ULg)
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See detailIdentities and change in public administrations: which interaction over time?
Rondeaux, Giseline ULg

Conference (2006, September)

In the name of their modernization, public administrations are confronted to series of change processes, under varied forms and addressed to several aspects of the administration. One can reasonably ... [more ▼]

In the name of their modernization, public administrations are confronted to series of change processes, under varied forms and addressed to several aspects of the administration. One can reasonably suppose that these upheavals cause effects on civil servants, on their relation to the organisation and on the way they see it. Within such a large question, our preoccupation is to question the existence of links between a major planned change within an administration (such as a NPM reform) and its organizational identities. Three hypotheses can be tested: • the impact: public reforms involve transformation of identities; • the independence: identities persist whatever the reforms may be; • and finally the co-structuring: reforms modify partly identities, but these ones shape also the reforms process. The position we adopt in this paper tends to be inscribed in this third hypothesis: we assume indeed that the introduction of a NPM reform leads to a hybridization of identity logics within public administration, but in other respects the reform process can be eventually influenced by the identity logics. We illustrate this assumption with empirical data collected in a Belgian Ministry. According to a first qualitative analysis we distinguished 6 identity profiles, characterised by their reference to either one or the other identity logic (public service or public managerialism) and their adopted positioning (fidelity or reality) (see EGPA 2005). 12 to 18 months later, we conducted a second set of interviews with the same sample of people we met before. This leads us to give these first results a longitudinal dimension and to propose an analysis of identity dynamics in a temporal perspective. We thus explain how identity profiles evolve over time. A concomitant analysis of the administration context and the identity changes allow us to reveal the links between identities and the continuous change context in which they are inscribed. Furthermore, we also proceed to the statistical exploitation of questionnaires sent to the whole Ministry personnel, in order to broadening our empirical basis. Doing this, we attempt to estimate the relative importance of the identity profiles as they are represented within this organization. Through our case study, our hypothesis of organizational identities and reform process co-structuring appears as valid, as shows the hybridization of identity logics within the administration we studied. Our results allow us to assume a modification of identity points of reference following a reform, as well as a reinterpretation of this reform through the identity filter. Our longitudinal approach reveals the identity dynamics constructed over time, by identifying notably the shift processes from one position to another. [less ▲]

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See detailExample of audit of an air conditioning system.
Andre, Philippe ULg; Rogiest, Corinne ULg; Hannay, Cleide ULg et al

Conference (2006, September)

The example presented here concerns the audit of a typical, medium-size, office building erected in Brussels at the end of the sixties. This building is equipped with a classical “old fashion” air ... [more ▼]

The example presented here concerns the audit of a typical, medium-size, office building erected in Brussels at the end of the sixties. This building is equipped with a classical “old fashion” air conditioning system with induction units. An audit procedure is developed and tested “in way”. It consists in a systematic analysis of all information available, with help of very simple calculation. Not all the orders of magnitudes of the fuel and mostly of the electricity consumption can be interpreted, but very significant energy saving opportunities are already discovered. [less ▲]

Detailed reference viewed: 55 (11 ULg)
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See detailL'évaluation assistée par ordinateur, une révolution manquée ?
Gilles, Jean-Luc ULg

Conference (2006, September)

Detailed reference viewed: 96 (1 ULg)
Peer Reviewed
See detailSchool fish behaviour
Becco, Christophe ULg; Vandewalle, Nicolas ULg; Delcourt, Johann ULg et al

Conference (2006, September)

Detailed reference viewed: 30 (4 ULg)
Peer Reviewed
See detailRèglementation concernant les critères microbiologiques.
Daube, Georges ULg

Conference (2006, September)

Detailed reference viewed: 12 (0 ULg)
Peer Reviewed
See detailFonctionnement inhibiteur dans le vieillissement normal et pathologique
Collette, Fabienne ULg

Conference (2006, September)

Detailed reference viewed: 3 (1 ULg)
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See detailLe rôle du lien social dans le parcours des SDF : enseignements pour une politique publique
Italiano, Patrick ULg; Deflandre, Dimitri; Jacquemain, Marc ULg

Conference (2006, September)

The theory of social capital according to Putnam insists on the fact that social relations are useful recourses in different situations of life. But it does not fit acuretaly the description of the ... [more ▼]

The theory of social capital according to Putnam insists on the fact that social relations are useful recourses in different situations of life. But it does not fit acuretaly the description of the situation of homeless people who are not necessarily deprived of a social network but who become more demanding in their social relationships. They want to give and receive and not only to use people as recourses. A Maussian theory of social link through gift is probably more relevant than social capital theory to describe those phenomena. [less ▲]

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See detailA statistical analysis of the location and width of Saturn's aurora, and implications for magnetospheric dynamics
Badman, S. V.; Cowley, S. W. H.; Gérard, Jean-Claude ULg et al

Conference (2006, September)

We present the results of a statistical analysis of the location of commonly-occurring auroral features in Saturn's southern polar ionosphere. Using a magnetospheric model, modified for Saturn from a data ... [more ▼]

We present the results of a statistical analysis of the location of commonly-occurring auroral features in Saturn's southern polar ionosphere. Using a magnetospheric model, modified for Saturn from a data-based terrestrial model (Tsyganenko, 1996), we estimate the region in the equatorial plane of the outer magnetosphere that maps to the observed aurora. We then discuss the possible magnetospheric processes that may cause these auroral emissions. [less ▲]

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See detailLa qualité de vie de sujets âgés déments, MCI et vulnérables : évaluations transversale et longitudinale
Missotten, Pierre ULg; Ylieff, Michel ULg; Schuerch, Michael et al

Conference (2006, September)

Detailed reference viewed: 31 (2 ULg)
See detailControl Theoretical Challenges in Systems Biology
Bullinger, Eric ULg

Conference (2006, August 29)

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See detailHistoricité et universalité dans Rwanda 94 du Groupov
Delhalle, Nancy ULg

Conference (2006, August 09)

Detailed reference viewed: 14 (4 ULg)
See detailCO emissions of fuel oil boilers used in domestic heating
Cuevas, Cristian; Ngendakumana, Philippe ULg

Conference (2006, August)

To assess the CO emissions of fuel oil boilers, tests have been performed on a boiler in transient and steady state regimes. The tests were performed so that the output power (about 370 kW) was kept ... [more ▼]

To assess the CO emissions of fuel oil boilers, tests have been performed on a boiler in transient and steady state regimes. The tests were performed so that the output power (about 370 kW) was kept constant in steady state regime (same water flow rate and inlet and outlet temperatures). On the other hand, the oxygen content of the flue gas in the chimney was kept constant (around 3%). Classical gas analysers were used to measure the CO2, O2, CO and NOx concentrations in the flue gas. The two main parameters investigated are the nozzle capacity and the corresponding fuel injection pressure to keep the same burner consumption. Four nozzles whose capacity ranges from 30 to 45 kg/h (at a fuel supply pressure of 20 bar) were fitted on the burner equipping the fuel oil boiler. All the nozzles used are spill return and 45° spray angle type. The tests performed showed that in steady-state regime, the CO emissions are very low compared to the limits established by the European standard (110 mg/kWh of energy consumption). A comparison with calculated CO emissions shows also that the values obtained in equilibrium conditions are too high. On the other hand, in the transient regime (start-up regime for a cycling boiler), the CO emissions are not negligible and increase significantly if a high capacity nozzle is fitted on the fuel oil burner. In short, the paper demonstrates that in order to increase the boiler thermal efficiency and thus to reduce CO2 emissions (for the same output power), one has to avoid the CO emissions in the transient regime. When performing a replacement of the burner nozzle, a low capacity nozzle associated with an adjustment of a high fuel injection pressure is recommended, since a reduction of CO emissions in the starting-up regime is achieved and, on the other hand, the thermal efficiency and the pollutants emissions of the fuel oil boiler in steady state regime are not affected. [less ▲]

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See detailAbstract numeration systems : a survey.
Rigo, Michel ULg

Conference (2006, August)

Detailed reference viewed: 8 (1 ULg)
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See detailMemory in Contracts: The Experience of the EBRD (1991-2003)
Artige, Lionel ULg

Conference (2006, August)

Detailed reference viewed: 10 (2 ULg)
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See detailRole of co-reactants during the formation of silica gels assessed by in situ SAXS
Gommes, Cédric ULg; goderis, bart; Pirard, Jean-Paul ULg et al

Conference (2006, August)

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See detailFeasibility study of the diluted combustion in a semi-industrial domestic heating boiler at low temperatures
SEGGIO, Giovanni; Ngendakumana, Philippe ULg; PESENTI, Barbara et al

Conference (2006, August)

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main ... [more ▼]

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main difficulty is due to the high geometrical confinement and heat losses of a typical boiler combustion chamber, which prevents from getting the minimum level of reactants dilution and temperature needed to reach mild combustion regime. In this work, a preliminary CFD study has been performed to select a jet burner and secondary gas injector able to generate sufficient dilution and temperature of the air and gas jets before they meet in the combustion chamber of the boiler. [less ▲]

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See detailStochastic Finite Element Analysis of Thermoelastic Effects in Micro-Resonators
Lepage, Séverine; Golinval, Jean-Claude ULg

Conference (2006, July 17)

In the design of micro-electromechanical systems (MEMS) such as micro-resonators, dissipation mechanisms may have detrimental effects on the quality factor. One of the major dissipation phenomena to ... [more ▼]

In the design of micro-electromechanical systems (MEMS) such as micro-resonators, dissipation mechanisms may have detrimental effects on the quality factor. One of the major dissipation phenomena to consider in such systems is thermoelastic damping. Hence, the performance of such MEMS is directly related to their thermoelastic quality factor which has to be predicted accurately. Moreover, the performance of MEMS can vary because manufacturing processes may leave substantial uncertainty in the geometry and in the material properties of the device. The reliability of MEMS devices is affected by the inability to accurately predict the stochastic behavior of the system due to the presence of these uncertainties. The aim of this paper is to provide a framework to account for uncertainties in the finite element analysis of the thermoelastic quality factor. The present work focuses on second moment approaches, in which the first two statistical moments, i.e. the mean and the variance, are estimated. The perturbation stochastic finite element method is used in order to determine the mean and the variance of the thermoelastic quality factor of MEMS. The perturbation SFEM [1] consists in a deterministic analysis complemented by a sensitivity analysis with respect to the random parameters. This enables the development of a Taylor series expansion of the response, from which the mean and variance of the response can be derived knowing the mean and variance of the random parameters. The perturbation SFEM is applied on the analysis of the thermoelastic quality factor of a micro-beam whose elastic modulus is considered as a random variable. Due to the nature of the thermoelastic problem, this study involves the calculation of eigenvalue sensitivities of a non-symmetric damped system [2]. The mean and variance of the quality factor are compared to the results obtained by Monte-Carlo simulations. References: [1] Kleiber, M., Hien, T.D., The stochastic finite element method: basic perturbation technique and computer implementation. Wiley & Sons, Chichester, 1992. [2] Choi, K.M., Jo, H.K., Kim, W.H., Lee, I.W., Sensitivity analysis of non-conservative eigensystems, Journal of Sound and Vibration, v. 274, p. 997-1011, 2004. [less ▲]

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See detailSafety and well-being at work.
Nyssen, Anne-Sophie ULg; Hansez, Isabelle ULg

Conference (2006, July 14)

Detailed reference viewed: 9 (3 ULg)