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See detailCan existing landscape ecology theories contribute to urbanization issues and concomitant ecosystem management?
Bogaert, Jan ULiege

in INTECOL (Ed.) Abstracts of the 90th Annual meeting of the Ecological Society of America held jointly with the IX International Congress of Ecology. (2005)

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See detailCan faecal markers detect a short term reduction in forage intake by cattle?
Benvenutti, Marcelo A.; Coates, David B.; Bindelle, Jérôme ULiege et al

in Animal Feed Science & Technology (2014), 194

Detection of a reduction in forage intake is particularly relevant in grazing animals due to its negative effect on animal performance. Estimations of intake reduction using faecal markers can be ... [more ▼]

Detection of a reduction in forage intake is particularly relevant in grazing animals due to its negative effect on animal performance. Estimations of intake reduction using faecal markers can be inaccurate due to the time delay between a change in forage intake and the subsequent change in faecal output. This delay may vary depending on forage quality and marker type. A pen study was conducted for 29 days to test the efficacy of liquid (PEG = polyethylene glycol) and solid (alkanes and CrCl3 = chromium chloride) phase faecal markers to detect a reduction in intake by steers of diets that varied in forage quality. Ten Brahman cross steers (296 ± 16 kg) were allocated equally to diets of leafy, high quality buffel grass (Cenchrus ciliaris) hay and stemmy, low quality buffel grass hay. Hay was offered ad libitum from day 1 to 7, at 90% of voluntary intake from day 8 to 14 and then reduced by 8% each day from day 15 to 24. On day 5 each steer was dosed with two slow release alkane capsules; also, steers received a single daily dose of PEG and CrCl3 at 09:00 on days 5 to 24. Actual and marker derived estimates of forage intake over days 10 to 22 were assessed by repeated-measures analysis of variance. Overall marker recovery rates were satisfactory (0.92 to 1.03) and there was a significant (P < 0.001) progressive decrease in daily recovery rate over time for all markers and diets. Actual and marker-determined forage intake declined over the course of the experiment for both leafy and stemmy hay diets (P < 0.001) for all three markers. There was a lag of 3 to 5 days to detect a significant reduction in estimated intake by steers using markers. The lag period was similar for both liquid and solid phase markers. Results of this experiment indicated that decreases in forage intake by cattle could be detected using indigestible faecal markers, albeit in association with (i) progressively larger reductions in actual forage intake, and (ii) a time lag of 3 to 5 days between the decrease in actual intake and its statistical detection using faecal markers. [less ▲]

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See detailCan Fe isotope fractionations trace the pedogenetic mechanisms involved in podzolization?
fekiakova, zuzana; vermeire, marie-liesse; bechon, L et al

in Geoderma (2017), 296

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See detailCan flexicurity make ethical sense? The ‘terceisation function’ as a moral lever for inter-organisational employment schemes
Xhauflair, Virginie ULiege; Pichault, François ULiege

in International Journal of Work Innovation (2012), 1(1), 6578

An employers’ alliance (EA) is a group of employers who team up to hire and share workers. It is presented as ‘flexicurity in action’, in other words, as a tool allowing employers and workers to find new ... [more ▼]

An employers’ alliance (EA) is a group of employers who team up to hire and share workers. It is presented as ‘flexicurity in action’, in other words, as a tool allowing employers and workers to find new win-win compromises at the company level. Even when motivated by the best of intentions and with all pre-conditions fulfilled, implementing such a new inter-organisational employment scheme might end in failure. We will describe such a failure with the help of a case study showing how employers considered the EA scheme as a possible solution for the informal multi-activity of their staff. We then explore some of the reasons for the failure in implementation and describe how a supporting third party function, which we call the terceisation function, could help the process to succeed and the EA to evolve towards a more equitable and sustainable flexicurity scheme. [less ▲]

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See detailCan Forwarding Loops Appear when Activating iBGP Multipath Load Sharing?
Balon, Simon ULiege; Leduc, Guy ULiege

in Lecture Notes in Computer Science (2007, November), 4866

We analyse the possible consequences of activating iBGP multipath load sharing in a given domain (or AS), which allows for load balancing over multiple exit routers. It has been stated that interdomain ... [more ▼]

We analyse the possible consequences of activating iBGP multipath load sharing in a given domain (or AS), which allows for load balancing over multiple exit routers. It has been stated that interdomain routing loops may appear in this case. We show that under reasonable assumptions (which reflect commercial relationships between ASes) such routing loops cannot appear. Furthermore we show that even if theses assumptions are not met, routing loops can only be transient. [less ▲]

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See detailCan GENIE characterize debris disks around nearby stars?
Absil, Olivier ULiege; Kaltenegger, L.; Eiroa, C. et al

in Fridlund, Malcolm; Henning, Thomas (Eds.) Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets (2003, October 01)

The Ground-based European Nulling Interferometer Experiment will combine the light collected by two or more VLT telescopes and make them interfere in a destructive way, thereby revealing the close ... [more ▼]

The Ground-based European Nulling Interferometer Experiment will combine the light collected by two or more VLT telescopes and make them interfere in a destructive way, thereby revealing the close neighborhood of nearby stars. Operating at mid-infrared wavelengths, GENIE will be particularly sensible to warm circumstellar dust. This paper presents simulated observations of the debris disk around the nearby A2V star zeta Leporis obtained with the GENIE simulation software. Parameters such as inclination, density power-law exponent and inner radius can be retrieved with a relative precision of 1% or better using only six observations of 15 minutes. In the context of the DARWIN/TPF mission, warm circumstellar dust could be a serious limitation to the detection of Earth-like exoplanets. This paper shows that GENIE will detect disks as faint as 23 times our local zodiacal cloud around Sun-like stars at 10 pc, and will thus allow to discard unsuitable targets for DARWIN/TPF. [less ▲]

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See detailCan global chemical weathering ever be modelled accurately?
François, Louis ULiege

Conference (2000)

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See detailCan home battery storage revolutionize the market for domestic pv systems?
Quoilin, Sylvain ULiege

Report (2015)

The recent disclosure of the Tesla Powerwall home battery system has been seen by many as a catalyser for a solar energy revolution, and has created high expectations in the sector. Many observers have ... [more ▼]

The recent disclosure of the Tesla Powerwall home battery system has been seen by many as a catalyser for a solar energy revolution, and has created high expectations in the sector. Many observers have predicted an uptake of combined PV/Battery units, which, according to them, could ultimately disconnect from the grid and lead to autonomous homes or mini-grids. However, most of the comments originating from social media, blogs or press articles lack proper cost evaluation and realistic simulations. This short, preliminary analysis aims at bridging this gap. It is part of a continued effort on technology watch, assessment and market valuation studies related to storage technologies. Disregarding the current media impact and emotions related to it, this analysis demonstrates through a realistic test case that: 1. Although decreasing at a fast pace, the cost of domestic Li-Ion storage is most likely still too high for a large-scale market uptake in Europe, 2. PV incentives based on net metering are not favourable to home batteries, 3. Home battery profitability and future uptake mainly depend on the indirect self-consumption subsidies provided by the structure of the retail prices, 4. These systems do not allow residential consumers to go off-grid. They only allow for a maximum self-sufficiency ratio close to 70%. The calculation files related to this note including all equations and hypotheses as well as the input data are available upon request. [less ▲]

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See detailCan horses be clinically screened for West Nile fever ?
van galen; Calozet, L; Leblond, Agnès et al

in Veterinary Record : Journal of the British Veterinary Association (2013), 172(4), 101

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See detailCan hyperspectral techniques improve estimates of carbon stocks in agricultural soils ?
Stevens, A.; van Wesemael, B.; Touré, Souleymane et al

in Proceedings of the Airborne imaging spectroscopy workshop : Belspo, Bruges 8 octobre 2004 (2004, October 08)

Soil organic carbon (SOC) represents one of the major pools in the global carbon cycle. However, fluxes of CO2 from soils into the atmosphere by respiration or inversely sequestration of CO2 through ... [more ▼]

Soil organic carbon (SOC) represents one of the major pools in the global carbon cycle. However, fluxes of CO2 from soils into the atmosphere by respiration or inversely sequestration of CO2 through photosynthesis and subsequent immobilisation in the form of humus are difficult to quantify. In principle changes in SOC stock over time reflect CO2 fluxes. The detection of these stock changes, however, require intensive sampling mainly due to the large spatial variability of SOC both within individual fields and larger units with similar soils and land use. The aim of this paper is to evaluate the potential of airborne-hyperspectral techniques using a CASI sensor and hand held Near Infrared Spectroscopy (NIRS) with an ASD spectrometer to conduct SOC inventories of individual parcels. During a field campaign in the Belgian Ardennes during Octobre 2003, more than 120 sites on a regular grid within 13 freshly ploughed fields were selected. At these sites, field spectra of the bare soil have been measured and samples from the topsoil were taken. SOC content (Walkley and Black), soil moisture and bulk density of these samples have been determined. As a first step, the soil reflectance has been transformed (log (1/R), Savitsky-Golay smoothing and derivative, gap derivative, moving average) in order to filter the spectral responses and to eliminate noise. Then, we used both stepwise and partial least square (PLS) regression analysis to relate these spectra to measured SOC contents. Regression models performed much better when the data were divided in two sub-groups representing different moisture conditions of the soil surface. These statistical model calibrations were validated on an independent data set. Standard Error of Prediction (SEP) ranged from 0.19 to 0.24 % carbon for the field spectra determined using the ASD depending on soil moisture of the surface layer. This is a little bit more than the reproducibility error inherent to the Walkley and Black analysis. Airborne CASI techniques performed less well mainly due to the narrow spectral range. Tests on airborne CASI+SASI hyperspectral data from a previous field campaign [1] showed better results. Overall, low bias allowed the use of spectral techniques to estimate population means with a high confidence level. The spectral techniques have a strong potential in determining changes in carbon tock change studies. The large within field variability of SOC content precludes the assessment, using conventional soil sampling, of SOC changes as a result of management (1 t C ha-1 yr-1) over a reasonable time period (5 years). Depending on the variance of the SOC content measured in the field ( 2 = 11-166 t C ha-1), we need 16-210 samples to detect a change. Since this number of samples is rarely available for individual fields, conventional sampling methods can only be used for larger spatial units containing many fields. In contrast, the airborne-hyperspectral technique and portable NIRS are able to supply these large amounts of data, and can thus improve the accuracy of SOC stock assessments of individual fields. This in turn will result in a smaller detection limit of SOC stock changes. [less ▲]

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See detailCan I improve postoperative outcome after abdominal surgery?
Lauwick, Séverine ULiege; Kaba, Abdourahmane ULiege; Joris, Jean ULiege

in Acta Anaesthesiologica Belgica (2007), 58(4), 253-4

Most of the textbooks of anesthesia do not devote any chapter to anesthesia for abdominal surgery. Whereas the choice of anesthetics has minimal impact on postoperative outcome of the patient scheduled ... [more ▼]

Most of the textbooks of anesthesia do not devote any chapter to anesthesia for abdominal surgery. Whereas the choice of anesthetics has minimal impact on postoperative outcome of the patient scheduled for these procedures global perioperative anesthetic management however affects postoperative recovery, convalescence, or even morbidity. This presentation highlights practical measures susceptible of reducing postoperative complications and of shortening patient convalescence. [less ▲]

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See detailCan laboratory tests help to define the profile of desensitised patients or patients at high risk of severe reaction ?
Gadisseur, Romy ULiege; Collard, Ludivine; Cataldo, Didier ULiege et al

in Allergy (2008), 63(Suppl. 88), 1773

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See detailCan Land Managers Control Japanese Knotweed? Lessons from Control Tests in Belgium
Delbart, Emmanuel; Mahy, Grégory ULiege; Weickmans, Bernard et al

in Environmental Management (2012), 50

Japanese knotweed Fallopia japonica is an extremely abundant invasive plant in Belgium and surrounding countries. To date, no eradication method is available for land managers facing the invasion of this ... [more ▼]

Japanese knotweed Fallopia japonica is an extremely abundant invasive plant in Belgium and surrounding countries. To date, no eradication method is available for land managers facing the invasion of this rhizomatous plant. We tested different chemical herbicides with two application methods (spraying and stem injection), as well as mechanical treatments, on knotweed clones throughout southern Belgium. The tested control methods were selected to be potentially usable by managers, e.g., using legally accepted rates for herbicides. Stem volume, height and density reduction were assessed after one or two years, depending on the control method. Labor estimations were made for each control method. No tested control method completely eradicated the clones. Stem injection with glyphosate-based herbicide (3.6 kg ha-1 of acid equivalent glyphosate) caused the most damage, i.e., no sprouting shoots were observed the year following the injection. The following year, though, stunted shoots appeared. Among the mechanical control methods, repeated cuts combined with native tree transplanting most appreciably reduced knotweed development. The most efficient methods we tested could curb knotweed invasion, but are not likely to be effective in eradicating the species. As such, they should be included in a more integrated restoration strategy, together with prevention and public awareness campaigns. [less ▲]

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See detailCan light make us bright? Effects of light on cognition and sleep.
Chellappa, Sarah Laxhmi ULiege; Gordijn, Marijke C. M.; Cajochen, Christian

in Progress in Brain Research (2011), 190

Light elicits robust nonvisual effects on numerous physiological and behavioral variables, such as the human sleep-wake cycle and cognitive performance. Light effects crucially rely on properties such as ... [more ▼]

Light elicits robust nonvisual effects on numerous physiological and behavioral variables, such as the human sleep-wake cycle and cognitive performance. Light effects crucially rely on properties such as dose, duration, timing, and wavelength. Recently, the use of methods such as fMRI to assess light effects on nonvisual brain responses has revealed how light can optimize brain function during specific cognitive tasks, especially in tasks of sustained attention. In this chapter, we address two main issues: how light impinges on cognition via consolidation of human sleep-wake cycles; and how light directly impacts on sleep and cognition, in particular in tasks of sustained attention. A thorough understanding of how light affects sleep and cognitive performance may help to improve light settings at home and at the workplace in order to improve well-being. [less ▲]

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See detailCan Lignin Wastes Originating From Cellulosic Ethanol Biorefineries Act as Radical Scavenging Agents?
Vanderghem, Caroline ULiege; Jacquet, Nicolas ULiege; Richel, Aurore ULiege

in Australian Journal of Chemistry (2014), 67

Lignin is a co-product from the biorefinery and paper industry. Its non-energetic valorization remains a field of extensive R&D developments. In this perspective, this study is undertaken to evaluate the ... [more ▼]

Lignin is a co-product from the biorefinery and paper industry. Its non-energetic valorization remains a field of extensive R&D developments. In this perspective, this study is undertaken to evaluate the radical scavenging ability of some herbaceous lignins. These lignins, extracted from Miscanthus (Miscanthus x giganteus) or Switchgrass (Panicum Virgatum L.), are selected as benchmarks for this study as a function of their chemical structure and average molecular weight. These technical lignins, side-products in the bioethanol production process, are found to display a moderate antioxidant activity as evaluated by the DPPH (1,1-diphenyl-2-picrylhydrazil) free radical scavenging test system. A correlation between the radical scavenging properties and the molecular features is proposed and discussed. Infrared spectroscopy is evaluated as a straightforward qualitative prediction tool for the radical scavenging capacity. [less ▲]

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See detailCan market access be taken seriously?
Sibony, Anne-Lise ULiege

in Revue Européenne de Droit de la Consommation = European Journal of Consumer Law [=REDC] (2012)

Can market access be taken seriously if actual effect of national measures is not taken into account? To address this question, it is useful to start by an observation of the Court's practice in relation ... [more ▼]

Can market access be taken seriously if actual effect of national measures is not taken into account? To address this question, it is useful to start by an observation of the Court's practice in relation to evidence of effects of national measures. The Court has developed an impressive array of evidence-avoiding techniques, which are surveyed in section 1. As a result, its approach to measures having equivalent effect stays very abstract. In this context, any potential conceptual novelty brought about by the adoption of the market access criterion is neutralized. For market access to be taken seriously, a conceptual framework for appraising market access restrictions is needed. Section 2 provides a preliminary enquiry into possible building blocs that could be borrowed from economics or behavioural sciences to build such a framework. Unlike what may be observed in the field of competition law, economics does not seem to be of much help to develop an effects-based approach in relation to market access. Behavioural sciences could be more promising as they can offer a realistic accounts of how consumer behave and, according to the Court's case law, the appraisal of market access may depend precisely on consumer behaviour. Yet, the Court's preference for an abstract approach leaves only a narrow space for importing insights from behavioural sciences into free movement law. It would take presumptions based on behavioural sciences (rather than case-specific evidence) to combine attention to facts and scientifically sound appraisal into a 'reasonably abstract' approach acceptable to the Court. [less ▲]

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See detailCan mass loss and overshooting prevent the excitation of g-modes in blue supergiants?
Godart, Mélanie ULiege; Noels-Grötsch, Arlette ULiege; Dupret, Marc-Antoine ULiege et al

in Monthly Notices of the Royal Astronomical Society (2009), 396

Thanks to their past history on the main-sequence phase, supergiant massive stars develop a convective shell around the helium core. This intermediate convective zone (ICZ) plays an essential role in ... [more ▼]

Thanks to their past history on the main-sequence phase, supergiant massive stars develop a convective shell around the helium core. This intermediate convective zone (ICZ) plays an essential role in governing which g-modes are excited. Indeed, a strong radiative damping occurs in the high-density radiative core but the ICZ acts as a barrier preventing the propagation of some g-modes into the core. These g-modes can thus be excited in supergiant stars by the kappa-mechanism in the superficial layers due to the opacity bump of iron, at logT = 5.2. However, massive stars are submitted to various complex phenomena such as rotation, magnetic fields, semiconvection, mass loss, overshooting. Each of these phenomena exerts a significant effect on the evolution and some of them could prevent the onset of the convective zone. We develop a numerical method which allows us to select the reflected, thus the potentially excited, modes only. We study different cases in order to show that mass loss and overshooting, in a large enough amount, reduce the extent of the ICZ and are unfavourable to the excitation of g-modes. [less ▲]

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See detailCan meandering flows in shallow rectangular reservoir be modelled with the 2D shallow water equations?
Peltier, Yann ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Journal of Hydraulic Engineering (2015)

In this article, the ability of the 2D shallow water equations to model meandering flows in shallow rectangular reservoirs is discussed. Four meandering flows, of various shallowness, were modelled using ... [more ▼]

In this article, the ability of the 2D shallow water equations to model meandering flows in shallow rectangular reservoirs is discussed. Four meandering flows, of various shallowness, were modelled using the academic flow model WOLF 2D, which includes a depth-averaged k- model accounting for the horizontal and vertical turbulent length-scales. The bottom friction was modelled with the Colebrook-White formula and different roughness heights were considered. A Proper Orthogonal Decomposition (POD) was applied to the simulation results to extract the behaviour of the main structures responsible for the meandering flow. The same POD analysis was also performed for the reference experimental flow fields, obtained by Large-Scale Particle Image Velocimetry. The first two POD modes obtained from the numerical simulations assuming a smooth bottom are in good agreement with the experimental modes in terms of energy, as well as temporal and spatial variations, whatever the shallowness. In contrast, the remaining simulated modes are not well rendered. The effect of an increased roughness height in the simulations is finally discussed. It leads to an improved reproduction of the first two modes and of the following modes, except when significant viscous effects govern in the flow. [less ▲]

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