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See detailLa lutte biologique et les terrains de sport et des espaces verts
Jijakli, Haissam ULg

Conference (2010, January)

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See detailPolitique fiscale: Quelles perspectives?
Jousten, Alain ULg

Conference (2010, January)

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See detailWheat yield and PAI decreasing shape curve
Kouadio, Amani Louis ULg; Tychon, Bernard ULg

Conference (2010, January)

Estimation of cereal-crop production is considered as a priority in most crop research programmes due to the relevance of food grain to world agricultural production. Today, a large number of ... [more ▼]

Estimation of cereal-crop production is considered as a priority in most crop research programmes due to the relevance of food grain to world agricultural production. Today, a large number of agrometeorological models for crop yield assessment are available with various levels of complexity and empiricism. A preliminary study was performed with simulated data of wheat yield and LAI derived from the WOFOST/CGMS agrometeorological model. The main hypothesis underlying this study is that it’s possible to improve wheat yield estimates from metrics stretched from LAI decreasing curves. This preliminary study showed that wheat yield can be estimated by metrics stretched from simulated LAI curve-fitting done by a modified Gompertz function [G =A*exp (-exp(-k(t-m)))] and a logistic function [G = A / 1+exp(-k(t-m)); where G is the green LAI (gLAI), A the initial percentage of LAI, m the position of the inflexion point in the decreasing part of the LAI curve and k the relative senescence rate. In 2009 a large field campaign in the Grand-Duchy of Luxembourg and France was done to check the validity of such approach with field data. Hemispheric images were taken on 18 winter wheat fields during the crop cycle, preferentially from inflorescence emergence to maturity. The variable of interest, green PAI (Plant Area Index), was retrieved after analyses of images by the CAN-EYE software (v. 6.1). Data used as input to establish the model of wheat yield estimate are the value of observed PAImax, and metrics k and m, stretched from observed PAI curves fitted by Gompertz and logistic functions. The model obtained by multilinear regression with these variables reveals that wheat yield can be estimated, at the scale of the plot, with a r² ≈ 0.70 and a RMSE = 0.87 t/ha (RRMSE = 9%). The validation of such approach at the scale of an agricultural zone or region will be performed in the next step of our study, by using remote sensing data (air temperature, PAI or LAI) and phenology data as input. Such simple models may be considered as a first yield estimates that may be completed, if justified, by other agrometeorological models in order to provide a better integrated yield assessment. [less ▲]

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See detailUn dispositif de légitimation paradoxale. Le cas des Physiologies
Stienon, Valérie ULg

Conference (2010, January)

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See detailTNFL–Induced p100 processing (TIPP) relies on the internalization of the cognate TNFR
Ganeff, Corinne; Galopin, Géraldine; Remouchamps, Caroline ULg et al

Conference (2010, January)

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See detailVocal fold hypomobility after thyroidectomy: diagnostic and treatments
FINCK, Camille ULg

Conference (2010, January)

Detailed reference viewed: 2 (1 ULg)
See detailMorphemes in the mind: Are there graded effects of semantic similarity on morphological processing in children?
Deacon, Hélène; Downing, Jennifer; Gonnerman, Laura et al

Conference (2010)

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See detailDevelopment of a new genetic evaluation model for carcass quality based on crossbred performances of Piétrain boars in the Walloon Region of Belgium
Dufrasne, Marie ULg; Hammami, Hedi ULg; Jaspart, Véronique et al

Conference (2010)

In context of the development of the genetic evaluation system of Piétrain boars for crossbred performances, a genetic evaluation model was developed for the estimation of genetic merit of boars for ... [more ▼]

In context of the development of the genetic evaluation system of Piétrain boars for crossbred performances, a genetic evaluation model was developed for the estimation of genetic merit of boars for backfat thickness (BF) and meat percentage (%meat). The model developed was a random regression model using linear splines on age which knots at 175, 200 and 250 days. Variance components were estimated by restricted maximum likelihood and Gibbs sampling. Estimated heritability from 150 to 300 days increased from 0.56 to 0.75 for BF and from 0.55 to 0.69 for %meat. Genetic correlation between BF and %meat varied between -0.90 and -0.93 from 150 to 300 days. According to the study of residuals, the developed model was considered to fit well the data especially between 175 and 250 days of age. [less ▲]

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See detailExtinction debt and colonization credit: When both phenomena are integrated
Piqueray, Julien ULg; Cristofoli, Sara; Bisteau, Emmanuelle et al

Conference (2010)

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the ... [more ▼]

Calcareous grasslands are among the most species-rich ecosystems in temperate countries. These ecosystems suffered a high fragmentation process during the last century. Fragmentation can lead to the creation of an extinction debt in remaining habitat patches. In our study site, it was shown in a previous study that Fragmented habitat patches (area loss since 1965 >80%) exhibited an extinction debt in comparison to Stable habitat patches (area loss since 1965 <80%). However, human activities also created new habitat patches in the landscape and provided therefore opportunities for calcareous grassland plant species to colonize new sites. They also provide opportunities for studying species colonization abilities in the context of habitat restoration. We analyzed species richness in these new patches in comparison to old patches in order to detect colonization credit. When taking as reference Fragmented patches (that exhibit an extinction debt) or all old patches (Fragmented and Stable), we concluded to the occurrence of a colonization credit in New patches. However, when the reference is Stable patches (the less likely to exhibit an extinction debt) alone, no colonization credit could be detected. Moreover, correspondence analysis revealed that New patches were similar to old patches in term of species composition. These results are encouraging for restoration programs. They also showed that the presence of an extinction debt in reference habitats can lead to mistaken conclusion in restoration monitoring. Extinction debt occurrence should be taken into account in the choice of reference habitats for evaluation of restoration success. [less ▲]

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See detailIs left ventricular longitudinal function related to metabolic abnormalities and fat distribution?
Laret, V; Magne, Julien ULg; O'Connor, K et al

Conference (2010)

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See detailThe Lower to Middle Devonian transitional flora from Dechra-Aït-Abdallah (Morocco).
Prestianni, Cyrille ULg; Meyer-Berthaud, Brigitte; Gerrienne, Philippe ULg

Conference (2010)

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See detailImproved Aid Effectiveness but Waiting for Results: What are the Missing Links?
Paul, Elisabeth ULg; Dujardin, Bruno; Ireland, Megan et al

Conference (2010)

Objectives: The objective is to analyze the content of the Paris Declaration (PD) on aid effectiveness and Accra Agenda for Action (AAA), and their practical implications for the health sector in aid ... [more ▼]

Objectives: The objective is to analyze the content of the Paris Declaration (PD) on aid effectiveness and Accra Agenda for Action (AAA), and their practical implications for the health sector in aid-recipient countries. Design/methods: The study draws on (i) a critical analysis of the two declarations, (ii) a review of the literature on their implementation and (iii) interviews of people in charge of implementing them – both donors and government representatives. Results: The PD and AAA both have a "missing link" between, on the one hand, international cooperation policies (five pillars of the PD) and national development (health) plans; and, on the other hand, the operational level that is supposed to deliver results. They presume that by changing aid management and respecting a few principles, development results will automatically improve as through a "black box". The influence of international and national policies over health systems, service providers’ behaviour and health impacts is not treated at all by the agenda for aid effectiveness, while it is crucial for its success. Moreover, that agenda is mostly dealt with at a too high level (international forums or at best national sector level), thus deepening the disconnexion from field realities. Conclusions/policy implications: This "missing link" entails the risk that, if the "black box" does not perform as expected – that is, if health systems and health service providers’ behaviour do not evolve in a positive way – and health impacts do not improve, the aid effectiveness agenda may be rejected at all, notwithstanding its (incomplete) added value. Hence the need to closely monitor the processes of national health plans implementation, so in order to better understand how these processes are translated on the field and what could be done to ensure that health service delivery and health results ultimately improve. [less ▲]

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See detailEvaluation of three essential oils as potential source of botanical fungicide
Kouassi, Kouadio Hugues Sosthène ULg; Bajji, M.; Zhiri, A. et al

Conference (2010)

Detailed reference viewed: 418 (13 ULg)
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See detailProcess mineralogy and automated phase identification in mixed copper ores at Kansanshi (Zambia)
Kottgen; Bastin, David ULg; Dufrane, Florent et al

Conference (2010)

Detailed reference viewed: 16 (0 ULg)
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See detailQuelle psychologie scolaire en Belgique ?
Frenkel, Stéphanie ULg

Conference (2010)

Detailed reference viewed: 63 (17 ULg)
See detailNeurobiologie de la dépression
Scantamburlo, Gabrielle ULg

Conference (2010)

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See detailNiveau de contamination et spéciation des métaux lourds dans l'Oued Fès et l'Oued Sebou.
Bouezmarni, Mohamed ULg; Debbaut, Vincent ULg; Diouri, S. El Edrissi et al

Conference (2010)

Detailed reference viewed: 52 (7 ULg)
See detailL’e-learning, un moyen pour retrouver l’enseignement à la Socrate ?
Baeyens, Jean-Pierre ULg; Rorive, Dominique ULg; Maron, Séverine ULg

Conference (2010)

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e ... [more ▼]

Le Campus Virtuel en Gestion a été créé à l’initiative de professeurs de trois grandes Ecoles de gestion en Communauté Française de Belgique. Ils ont pris conscience qu’ils ne pouvaient pas aborder le e-learning seuls et se sont entourés d’une équipe technico-pédagogique. Cette équipe a organisé un accompagnement de chaque professeur. La méthode de travail mise en place se centre d'une part sur le professeur et d'autre part sur les apprenants. Le professeur est à la fois l’auteur, l’expert contenu, il fixe les objectifs du cours et la méthodologie est structurée en fonction de ses besoins. Par contre, ce qui est nouveau pour lui c’est l’approche e-learning, le fait que celle-ci doit apporter de la valeur ajoutée pédagogique, obligeant dès lors l’enseignant à procéder à un redécoupage de son cours et à concevoir de nouvelles activités d’apprentissage à distance et en présentiel. En acceptant d’entrer dans cette démarche, il s’engage à développer de nouvelles compétences et entre dans une réflexion pédagogique sur son métier d’enseignant. [less ▲]

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See detailHow bright is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint ... [more ▼]

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint emissions in both hemispheres. Recent results showed that this footprint is formed of several spots and an extended tail. Each feature is suggested to correspond to a different step in the propagation of the perturbation and in the electron energization processes. The present study focuses on the variations of the spots' brightness at different timescales from minutes to years through the rotation period of Jupiter. It relies on FUV images acquired with the STIS and ACS instruments onboard the Hubble Space Telescope. Since the footprint is composed of several localized features, a good understanding of the emission region geometry is critical to derive the actual vertical brightness and thus the precipitated energy flux. We developed a 3D emission model in order to assess as precisely as possible the respective contribution of each individual feature and to correctly estimate the precipitating energy flux. As far as the brightness variations on timescales of minutes are concerned, we will present results from the high time resolution campaign executed during summer 2009. On timescale of several hours, we will show that the variation of the emitted power as a function of the location of Io in the plasma torus suggests that the Jovian surface magnetic field strength is an important controlling parameter. Finally, the measured precipitated power and particle fluxes will be discussed in comparison with recent simulations considering both Alfvén waves filamentation and electron acceleration when the Alfvén waves become inertial. [less ▲]

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See detailSelective epitaxial growth of III-V semiconductor on large-area Si substrate for advanced logic CMOS technologies
Nguyen, Ngoc Duy ULg; Brammertz, Guy; Wang, Gang et al

Conference (2010)

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier ... [more ▼]

The continued downscaling of the metal-oxide semiconductor (MOS) transistor for sub-22 nm logic circuits with boosted performance will require the introduction of new channel materials with carrier mobility higher than that of Si, such as Ge for pMOS. The use of III-V compounds for nMOS devices poses however additional challenges related to the hetero-epitaxial growth of a polar semiconductor on a non-polar surface. Furthermore, these high-mobility materials have to be fabricated on large-area Si substrates, in the perspective of application in a standard low-cost very-large-scale integration scheme. In this work, we report on the successful growth of GaAs on 200 mm Si wafers by means of metal-organic vapor deposition using a modified Crius Close-Coupled Showerhead system from AIXTRON AG. We used Si (100) wafers with off-axis orientation (6° miscut towards <111>) in order to avoid the formation of anti-phase domains which lead to Ga-Ga and As-As bonds at their boundaries that have strong detrimental effects on the electrical conduction. In our approach, based on Ge virtual substrates with low threading dislocation (TD) density, the lattice mismatch between Si and GaAs is accommodated and, thus, no additional TD is introduced in the deposited III-V film. Our results show that smooth GaAs layers can be epitaxially grown on large-area Si substrates with high wafer-scale thickness uniformity. The excellent quality of the deposited GaAs was confirmed by photoluminescence and electron microscopy. Our process also demonstrates very high selectivity on patterned wafers with SiO2 mask and enabled the fabrication of capacitor structures using an integration process flow very similar to standard high volume Si manufacturing lines. The capacitance-voltage characteristics were similar to the ones obtained on a bulk GaAs substrate, and showed extremely tight within-wafer and wafer-to-wafer distributions as is standard to Si manufacturing. [less ▲]

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See detailExpériences belges en matière d’équité salariale
Cornet, Annie ULg

Conference (2010)

Detailed reference viewed: 47 (4 ULg)
Peer Reviewed
See detailIsotope shifts and hyperfine structure of the Fe I 372-nm resonance line
Oppel, S.; Krins, Stéphanie ULg; Huet, Nicolas ULg et al

Conference (2010)

Detailed reference viewed: 44 (16 ULg)
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See detailProsodic marking of information status in Dutch and French as foreign languages. Production and perception
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

Detailed reference viewed: 11 (0 ULg)
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See detailPerceiving prosodic prominence in a second language
Rasier, Laurent ULg; Caspers, Johanneke; Van Heuven, Vincent

Conference (2010)

Detailed reference viewed: 17 (0 ULg)
See detailMagnetic Susceptibility of Frasnian reefs and mounds from Eastern Belgium.
Demaude, Nicolas; Boulvain, Frédéric ULg; Cornet, Pierre et al

Conference (2010)

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See detailPratiques nouvelles en conception industrielle: adaptation des acteurs, des objets médiateurs et des modalités de travail.
Elsen, Catherine ULg; Dawans, Arnaud ULg

Conference (2010)

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « ... [more ▼]

Une intervention in situ de deux mois au sein d’une équipe de conception de produits industriels (designers, dessinateurs), construite sur les méthodologies et théories de l’approche ergonomique « compréhensive », interroge les pratiques nouvelles de ces métiers depuis l’avènement de la CAO. Les « objets médiateurs » sont considérés selon leurs apports respectifs et complémentaires et non plus selon une approche dichotomique, et leur étude structure l’ensemble du recueil des données. Une méthodologie de traitement et d’analyse des informations récoltées est présentée (approche chronologique et analyses « verticales » sur base de lignes du temps). Celle-ci nous permet de tracer les nombreuses adaptations dont font preuve les acteurs tout au long de leur processus: adaptations de leurs outils et représentations, de leurs modalités de travail individuelles ou collaboratives, adaptations et développement de nouvelles compétences. [less ▲]

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See detailSaturn's polar auroral emissions
Radioti, Aikaterini ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2010)

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See detailCarbon dioxide and methane dynamics in estuaries
Borges, Alberto ULg; Abril, G.

Conference (2010)

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See detailEffects of Polychlorinated Biphenyls on Thyroid Hormone Physiology and Metabolism of European sea bass (Dicentrarchus labrax)
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and ... [more ▼]

Studies in the laboratory have shown that a number of synthetic and natural chemicals can interfere with the endocrine system in fish. Among them, organic compounds such as pesticides and polychlorobiphenyls (PCBs) are well described endocrine disrupters. Of particular interest are effects on thyroid function, but data on effects of PCB exposure on these hormones and related metabolism has been lacking. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure, muscular thyroid hormone concentrations and the main metabolic pathways for thyroid hormones (deiodination, glucuronidation and sulfatation) were assessed. Exposure to environmental relevant doses of PCB (from 0.3 to 0.9 ppm [7 ICES PCB]). alters hepatic T4 outer ring deiodinase and T4 sulfatation whereas T4 glucuronidation was not affected. Owing to the extensive autoregulatory feedback at both central and peripheral levels, the thyroid hormone concentrations were preserved despite the PCB induced changes in thyroid hormone dynamics. At 10 times higher concentrations (10 ppm [7 ICES PCB]). an important depression of muscular T3 and T4 levels could be observed which are apparently caused by other mechanisms than metabolic pathways. Further analysis is required to evaluate thyroid gland function and secretion. These results support the observations made in our field study in wild sea bass (Dicentrarchus labrax) from coastal regions near several important European rivers mouths. [less ▲]

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See detailModern approaches to Corpus Linguistics
Longrée, Dominique ULg

Conference (2010)

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See detailPolychlorinated Biphenyls affect Histological Appearance of European sea bass (Dicentrarchus labrax) Thyroids
Schnitzler, Joseph ULg; Klaren, Peter; Celis, Niko et al

Conference (2010)

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on ... [more ▼]

Polychlorobiphenyls (PCBs) are well-described endocrine disrupters and of particular interest are effects on thyroid function. We propose here a thorough approach to assess effects of these compounds on the thyroid function of European sea bass (Dicentrarchus labrax). An experimental exposure of sea bass to commercial PCB mixtures has been designed to understand underlying toxicity mechanisms and effects on the thyroid system. After 120 days of exposure histological appearance of thyroid tissue was assessed by light and electron microscopy. The follicle area, perimeter, diameter, length and with of every follicle cross section were interactively measured. The shape of the follicles was described with three dimensionless shape descriptors: roundness, form factor and aspect ratio. The histomorphometrical analysis showed a greater heterogeneity of thyroid follicle diameter and especially higher epithelial cell heights in sea bass exposed to environmental relevant doses of PCB (from 0.3 to 0.9 μg g-1 [7 ICES PCB]). Ultrastructural histological investigations showed that the epithelial cells surrounding the bigger follicles present an higher accumulation of colloid droplets. This was interpreted to be the result of increased stimulation of follicular cells. No differences in shape could be identified among the different treatment groups The size of the follicles and the form of the follicular cells gives an indication of the secretary activity of the gland. These observations support the hypothesis that the contamination of PCB mixtures can induce a hyperactivity of the thyroid tissue. These observations were confirmed by measurements of muscular thyroid hormone concentrations and activity thyroid hormone metabolism. [less ▲]

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See detailDE LA CULTURE ITINERANTE SUR BRULIS AUX JACHERES ENRICHIES PRODUCTRICES DE CHARBON DE BOIS, EN R. D. DU CONGO
Peltier, Régis; Bisiaux, Franck; Dubiez, Emilien et al

Conference (2010)

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of ... [more ▼]

—From slash-and-burn to slash-and-charcoal in R.D. Congo Kinshasa, the capital of the Democratic Republic of the Congo, has some 8 million inhabitants and is mainly surrounded by savanna and patches of degraded forest. Estimated fuelwood consumption is in the range of 3 to 6 million tones of fuelwood equivalent per year (representing 0.6 to 1.2 MT of charcoal per year if all the wood were charcoaled). The Mampu project was designed as the pilot phase of a reforestation project covering 100 000 hectares of sandy soil on the Bateke plateau and aiming to remedy wood and charcoal scarcities. Despite the conflicts, about 8000 hectares of Acacia auriculiformis were planted, mainly from 1987 to 1993. From about 1994, the Mampu plantation was divided into 25 hectare plots for 320 farming families. Cultivation mainly follows the agroforestry pattern based on improved fallows, which draws on traditional slash-and-burn farming. Total charcoal production from the plantation varies from 8 000 to 12 000 tonnes per year, in addition to 10 000 T/year of cassava, 1 200 T/year of maize and 6 T/year of honey. The success of the project is an incentive to apply the model to the savanna lands on the Bateke plateaus, taking traditional land rights into consideration and continuing activities to diversify and process production locally. This will help to cover a larger share of urban needs for renewable energy while also creating rural employment. However, other agroforestry systems deserve to be tested or developed for different ecological and social or economic conditions across the country, such as management of the natural regrowth of local multiple-use species as applied with the traditional system of fallow enrichment (Nkunku) in the Lower Congo. [less ▲]

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See detailSubspace-based Methods for Machinery Analysis and Monitoring
Nguyen, Viet Ha ULg; Rutten, Christophe ULg; Golinval, Jean-Claude ULg

Conference (2010)

The objective of this presentation is to address the problem of structural damage detection or fault diagnosis in mechanical systems using subspace-based methods. Different methods are reviewed starting ... [more ▼]

The objective of this presentation is to address the problem of structural damage detection or fault diagnosis in mechanical systems using subspace-based methods. Different methods are reviewed starting from Principal Component Analysis (PCA) also known as Proper Orthogonal Decomposition (POD) of time responses. PCA is known as an efficient method for extracting modal features of linear structures from output-only measurements. Those features define a subspace which characterizes the dynamical behavior of the structure. It becomes than possible to detect structural damage by comparing a reference subspace (obtained from the healthy structure) with current subspaces on the basis of the concept of angles between subspaces. Other damage indexes based on statistics may also be used. One of the drawbacks of PCA is the need of several sensors. If the number of sensors is too small, modal identification and/or damage detection may not be performed in good conditions using PCA. An alternative PCA-based method named Null Subspace Analysis (NSA) may then be used. The NSA method generates data by means of block Hankel matrices and is proven to be efficient when the number of available sensors is small or even reduced to one sensor only. However, when damage activates nonlinearity, the detection problem may necessitate methods which are more sensitive to nonlinear behaviors. To this purpose, Kernel Principal Component Analysis (KPCA) is a nonlinear extension of PCA built to authorize features with nonlinear dependence between variables. The method is “flexible” in the sense that different kernel functions may be used to better fit the testing data. Industrial applications are presented to illustrate the proposed methods. [less ▲]

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See detailAppétence et adhérence des systèmes de réparation : importance de la préparation du support
Courard, Luc ULg

Conference (2010)

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ... [more ▼]

La compatibilité – ou appétence - entre un système de réparation et le béton support est définie à partir des propriétés du support et de la couche d’apport – essentiellement dans sa phase non liée – ainsi que de l’environnement dans lequel le contact est créé. Elle s’exprime habituellement en termes de variations dimensionnelles, de perméabilité et de propriétés chimiques et électrochimiques. Ces propriétés sont évoquées ou développées pour chacun des matériaux mis en présence : rugosité, porosité, cohésion superficielle et eau interstitielle pour le béton ; retrait, fluage, rigidité, absorption capillaire pour les produits de réparation. Trois conditions fondamentales nécessaires et suffisantes au développement de l’adhérence en tant que signe de la compatibilité entre matériaux sont évoquées et illustrées pour le cas particulier de la préparation de surface : sablage, burinage, hydro démolition, marteau-piqueur, … ont un effet spécifique non seulement sur la rugosité, et donc l’accrochage mécanique du système de réparation, mais aussi sur la cohésion de la couche superficielle du béton [less ▲]

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See detailEnjeux fonciers et exploitation du bois-énergie en périphérie de Kinshasa, RDC
Vermeulen, Cédric ULg; Mutambwe, Shango; Dubiez, Emilien et al

Conference (2010)

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines ... [more ▼]

L’identification des acteurs, des finages, des dynamiques sociales locales et du rapport à la terre et aux ressources naturelles constitue un préalable à toute intervention dans les zones péri-urbaines soumises à forte pression anthropique. En République Démocratique du Congo, la capitale Kinshasa, mégapole en pleine extension, engendre une pression considérable sur les ressources ligneuses dans les finages des villages situés dans sa grande périphérie. La présente communication décrit les rapports des acteurs aux espaces-ressources dans deux zones (Bas-Congo et plateau Bateke) situées en périphérie de cette ville, zones considérées comme des bassins d’approvisionnement en bois-énergie. Les deux sites différent en termes de pression foncière (très élevée dans le Bas-congo, centrée sur les forêts galerie sur les plateaux Bateke) mais présentent les mêmes faciès de surexploitation des ressources ligneuses. Dans les deux cas, la gestion locale, aux mains des chefs de villages ou des chefs de lignée, a failli. La volonté de reboisement est aussi grande au Bas-Congo qu’elle semble moins développée sur les plateaux. Dans les deux situations, la pratique du retour rapide sur la formation végétale (pour l’agriculture ou pour l’exploitation du charbon de bois) hypothèque la possibilité de régénération de la plupart des essences locales. [less ▲]

Detailed reference viewed: 74 (7 ULg)
See detailEvolution of anatomical complexity, including an early type of cambium, in Psilophyton-grade plants.
Strullu-Derrien, Marie-Christine; Gensel, Patricia G.; Gerrienne, Philippe ULg

Conference (2010)

Detailed reference viewed: 23 (1 ULg)
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See detailEffect of rosemary extract and related flavonoid carnosol on chondro-protection and on the bone-cartilage crosstalk
Horcajada, Marie-Noelle; Sanchez, Christelle ULg; Scalfo, Fanny et al

Conference (2010)

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See detailComment la confiance envers le supérieur hiérarchique influence la créativité et le voice des employés. Le rôle du sentiment de responsabilité.
De Zanet, Fabrice ULg

Conference (2010)

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue ... [more ▼]

Les entreprises attendent de plus en plus de leurs employés qu’ils soient proactifs et prennent des initiatives. Or, un employé qui est proactif prend un risque, car son initiative peut être perçue négativement par la hiérarchie. Detert et Burris (2007) postulent ainsi que la décision d’être proactif résulte d’un calcul coûts-bénéfices. Par ailleurs, un employé est d’autant plus enclin à prendre des risques qu’il fait confiance à son supérieur hiérarchique (Mayer, Davis, & Schoorman, 1995). En conséquence, la confiance des employés envers leur supérieur hiérarchique est certainement un facteur clé dans l’adoption par les employés de comportements proactifs. Néanmoins, il reste encore à comprendre le mécanisme à travers lequel la confiance envers le supérieur hiérarchique influence la proactivité des employés. L’objectif de cet article est de montrer comment la confiance des employés envers le supérieur hiérarchique influence - via le sentiment de responsabilité des employés - l’adoption de deux comportements proactifs, à savoir la créativité, c'est-à-dire le fait de proposer des idées innovantes et utiles, et le voice, c'est-à-dire le fait de faire remonter des informations potentiellement critiques à propos du fonctionnement de l’organisation. Les analyses réalisées sur 111 paires employés-supérieurs montrent que la confiance envers le supérieur hiérarchique agit sur le niveau créativité et de voice des employés et que cette influence est médiée par le fait que ces derniers se sentent davantage responsables d’apporter des changements constructifs dans leur travail. [less ▲]

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See detailLa biopolitique et les nouveaux pouvoirs sur la vie
Caeymaex, Florence ULg

Conference (2010)

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See detailStrengthening local innovations in rice processing through video in Benin
Zossou, Espérance; Van Mele, P.; Vodouhe, D. S. et al

Conference (2010)

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before ... [more ▼]

In Africa, rice processing provides employment for many rural people. A survey on local rice processing methods in the north, central and south of Benin shows that local rice is often parboiled before milling. Parboiling is a transformation process that enhances the quality of rice. This important income generating activity is exclusively done by women from rice producing communities. In Benin, the traditional parboiling method is still prevailing and does not lead to quality rice. To address this, an improved rice parboiling technology was developed. AfricaRice subsequently developed a video where rural women explain how to use this improved technology. Four NGOs in central Benin publicly screened the video in 80 villages. After women watched the video, they started using the improved parboiler equipment individually or collectively. Women who didn’t have the financial support to buy the improved equipment understood its principle and developed creative solutions based on the idea of pre-cooking paddy with steam. Video watching also made women pay attention to reducing the loss of steam and to use local resources innovatively to conserve energy. Women also improved the quality of their parboiled rice by removing dirt, properly washing rice and drying rice on tarpaulins. On the other hand, in the north and south of Benin where there were no public video screenings, the traditional rice parboiling method is still predominant. This study shows the potential of farmer-to-farmer video to improve farmers’ practices and their attitudes to work collectively in agro-processing and marketing. [less ▲]

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See detailHow large is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's ... [more ▼]

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's magnetosphere. It consists of several spots followed downstream by an extended tail. The size of the main spot is expected to scale to the size of the interaction region close to Io. Consequently, this quantity is crucial to understand the processes involved. However, the main spot size is a controversial issue as previously published values range from ~400 km to ~10000 km, leading to contradictory conclusions. Based on observations carried on with the Hubble Space Telescope STIS and ACS FUV instruments from 1997 to 2009, we estimate the size of the main footprint spot on a much larger image sample than previously. Additionally, we carefully selected the images in order to avoid viewing geometry ambiguities when measuring the spatial extent of the different features. The main spot length along the footpath is ~900 km while its width perpendicular to the footpath is <200 km. The spot length is larger than the projected diameter of Io along unperturbed magnetic field lines, which appears to be consistent with recent simulations. The vertical extent and the peak altitude of the main spot are similar to those measured in the tail. Nevertheless, the secondary spot attributed to trans-hemispheric electron beams has been measured to peak at ∼200 km below the main spot and the tail, which confirms their different origins. [less ▲]

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See detailRegards sur les industries laminaires du Paléolithique moyen en Asie centrale
Flas, Damien ULg; Krivoshapkin, A.; Kolobova, K. et al

Conference (2010)

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See detailEnsemble-based assimilation of high-frequency radar surface currents in regional ocean models
Barth, Alexander ULg; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg et al

Conference (2010)

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by ... [more ▼]

The results of coastal ocean models depend critically on the accuracy of boundary and initial conditions and atmospheric forcing. The precision of coastal ocean models is limited among others by uncertainty in those forcing fields. Since high-frequency (HF) radar installations provide measurements over a relatively large area, the assimilation of these data has a high potential to reduce the errors in ocean models and to provide a dynamically consistent estimation of the ocean circulation. The assimilation of HF radar data is not without its own challenges: the spatial variation of the surface currents uncertainty, the high temporal resolution of HF radar data, the simultaneous presence of a wide range of processes with distinct spatial and temporal scales (tides and other surface gravity waves, mesoscale and wind-driven circulation), and the generally strong sensitivity of regional models to errors in the boundary conditions and atmospheric forcings. These processess are important aspects to consider in the application of data assimilation methods to HF radar measurements. The results of two data assimilation experiments on the West Florida Shelf (WFS) and the German Bight are presented. HF radar currents are assimilated in a nested West Florida Shelf based on an ensemble of model realizations with different wind forcings. The model is sequentially updated and a filter is implemented to reduce spurious surface-gravity waves. Results of the WFS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth compared to independent ADCP observations. This West Florida Shelf assimilation experiment does not include tides. Tides are not generated within the domain, but are rather propagated inside the domain through the boundary conditions. The potential of using HF radar data to reduce errors in tidal boundary conditions is shown in a model setup of the German Bight. For improving the modeled tidal variability it is not sufficient to update the model state without updating the boundary conditions. An ensemble smoother to improve the tidal boundary values is presented and validated with independent HF radar measurements and tide-gage data. The ensemble-scheme is also applied to improve the wind forcing by assimilation of surface currents. The improvement of the analyzed wind forcing is assessed by using in-situ wind measurements. [less ▲]

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See detailLes impôts sur les revenus
Bourgeois, Marc ULg

Conference (2010)

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Peer Reviewed
See detailTool use and site function in the European Middle Palaeolithic
Rots, Veerle ULg

Conference (2010)

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Peer Reviewed
See detailTrade Union implication in the sustainable development:global position and contingent situations
Robert, Jocelyne ULg

Conference (2010)

This article presents Sustainibility Development in relation to the Social responsibility. In this context we analyze relationship between trade-unions and sustainable development in Belgium. Which ... [more ▼]

This article presents Sustainibility Development in relation to the Social responsibility. In this context we analyze relationship between trade-unions and sustainable development in Belgium. Which involvement of th trade-unions in environment protection, work quality and benefit notion. Which actors and relations between the actors? Wich obstacles during the appropriation of the sustainable development by the trade-unions. [less ▲]

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See detailInternal energy content of ions in a travelling wave ion guide
Morsa, Denis ULg; Gabelica, Valérie ULg; Rosu, Frédéric ULg et al

Conference (2010)

Travelling wave ion guides (TWIGs) separate of ions according to their mobility and, at constant charge, according to their shape. The ion mobility separation itself should not modify the shape of the ... [more ▼]

Travelling wave ion guides (TWIGs) separate of ions according to their mobility and, at constant charge, according to their shape. The ion mobility separation itself should not modify the shape of the systems investigated. It was recently suggested by Shvartsburg et al. that the higher fields used in TWIGs than in traditional drift tubes would cause significant heating of the ions. We present a quantitative analysis of the amount of internal energy imparted to ions as they are separated in TWIGs. Benzylpyridinium ions were chosen as “thermometer” ions. Based on arrival time distributions, the fragment ion population is separated as a function of the place of formation: before, in, or after the TWIG. Fragmentation all along the TWIG was observed. The roles of the travelling wave’s voltage, speed, and of the gas nature and pressure will be discussed in detail as well of the consequences on instruments performances. [less ▲]

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