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See detailNe dites plus Constitution
Petit, Nicolas ULg

Article for general public (2009)

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See detailModeling milk urea of Walloon dairy cows in management perspectives.
Bastin, Catherine ULg; Laloux, Laurent; Gillon, Alain ULg et al

in Journal of Dairy Science (2009), 92(7), 3529-40

The aim of this study was to develop an adapted random regression test-day model for milk urea (MU) and to study the possibility of using predictions and solutions given by the model for management ... [more ▼]

The aim of this study was to develop an adapted random regression test-day model for milk urea (MU) and to study the possibility of using predictions and solutions given by the model for management purposes. Data included 607,416 MU test-day records of first-lactation cows from 632 dairy herds in the Walloon Region of Belgium. Several advanced features were used. First, to detect the herd influence, the classical herd x test-day effect was split into 3 new effects: a fixed herd x year effect, a fixed herd x month-period effect, and a random herd test-day effect. A fixed time period regression was added in the model to take into account the yearly oscillations of MU on a population scale. Moreover, first autoregressive processes were introduced and allowed us to consider the link between successive test-day records. The variance component estimation indicated that large variance was associated with the random herd x test-day effect (48% of the total variance), suggesting the strong influence of herd management on the MU level. The heritability estimate was 0.13. By comparing observed and predicted MU levels at both the individual and herd levels, target ranges for MU concentrations were defined to take into account features of each cow and each herd. At the cow level, an MU record was considered as deviant if it was <200 or >400 mg/L (target range used in the field) and if the prediction error was >50 mg/L (indicating a significant deviation from the expected level). Approximately 7.5% of the MU records collected between June 2007 and May 2008 were beyond these thresholds. This combination allowed for the detection of potentially suspicious cows. At the herd level, the expected MU level was considered as the sum of the solutions for specific herd effects. A herd was considered as deviant from its target range when the prediction error was greater than the standard deviation of MU averaged by herd test day. Results showed that 6.7% of the herd test-day MU levels between June 2007 and May 2008 were considered deviant. These deviations seemed to occur more often during the grazing period. Although theoretical considerations developed in this study should be validated in the field, this research showed the potential use of a test-day model for analyzing functional traits to advise dairy farmers. [less ▲]

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See detailChapitre 7. La littérature wallonne
Boutier, Marie-Guy ULg

in Bruyère, Paul; Marchandisse, Alain (Eds.) Florilège du livre en principauté de Liège du IXe au XVIIIe siècle (2009)

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See detailGround-Target Tracking in Multiple Cameras Using Collaborative Particle Filters and Principal Axis-Based Integration
Du, Wei ULg; Hayet, Jean-Bernard; Verly, Jacques ULg et al

in IPSJ Transactions on Computer Vision and Applications (2009), 1

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See detailFormes de François Jacqmin
Purnelle, Gérald ULg

in Demoulin, Laurent; Purnelle, Gérald (Eds.) Textyles n°35: François Jacqmin (2009)

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See detailExpression of the "glanded-plant and glandless-seed" trait of Australian diploid cottons in different genetic backgrounds.
Benbouza, Halima; Lognay, Georges ULg; Scheffler, Jodi et al

in Euphytica : International Journal of Plant Breeding (2009), 165(2), 211-221

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See detailAdsorption of essential oil components of Xylopia aethiopica (Annonaceae) by kaolin from Wak, Adamawa province (Cameroon).
Nguemtchouin, M. M. G.; Ngassoum, M. B.; Ngamo, L. S. T. et al

in Applied Clay Science (2009), 44(1-2), 1-6

Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of stored grains from insect pest attacks. These chemical insecticides are less attractive to producers because ... [more ▼]

Essential oils of aromatic plants are nowadays cited as suitable tools for better protection of stored grains from insect pest attacks. These chemical insecticides are less attractive to producers because of their low persistence and difficulty to use as pure product. There is therefore a need to formulate themas an easy handling chemical with better persistence. The present work aimed to study the formulation through adsorption of active components of Xylopia aethiopica Dunal (Annonaceae) essential oil on kaolin. X. aethiopica essential oil was obtained by hydrodistillation in a Clevenger type apparatus unit. Essential oil obtained was analysed by a GC–FID and a GC–MS. The adsorption measurements were performed with collected two kaolin fractions (F1 <100 μm; F2 <50 μm) and two kaolin fractions after H2O2 treatment (F3 <50 μm; F4 <2 μm). The kaolin was characterized by XRD, XRF, FTIR; its specific surface area was determined by the B.E.T method. The amount of essential oil adsorbed was inversely proportional to the particles size. Treatment of kaolin with hydrogen peroxide increased the adsorption capacity of essential oil components. The components adsorbed in highest amounts were sabinene, β-pinene, α-pinene and β-phellandrene. [less ▲]

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See detailNon, les cabinets d'avocats ne sont pas des banques données!
Jacobs, Ann ULg; Henry, Patrick

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2009), 19

Etat de la jurisprudence belge en matière de perquisitions dans les cabinets d'avocats; critique de cette jurisprudence au regard de la jurisprudence de la Cour européenne des droits de l'homme et ... [more ▼]

Etat de la jurisprudence belge en matière de perquisitions dans les cabinets d'avocats; critique de cette jurisprudence au regard de la jurisprudence de la Cour européenne des droits de l'homme et propositions de changements. [less ▲]

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See detailTransition from turbulent to nearly laminar vortex flow in superconductors with periodic pinning
Gutierrez, J.; Silhanek, Alejandro ULg; Van de Vondel, J. et al

in Physical Review. B : Condensed Matter (2009), 80(14),

We revisit the vortex dynamics in Al thin films containing an artificial periodic array of antidots by means of electrical transport measurements. We clearly identify a turbulent to laminarlike vortex ... [more ▼]

We revisit the vortex dynamics in Al thin films containing an artificial periodic array of antidots by means of electrical transport measurements. We clearly identify a turbulent to laminarlike vortex flow transition which manifests itself as a negative differential resistivity. This transition is accompanied by a strong irreversibility in the voltage-current characteristics. The dynamical phase diagrams obtained as a function of commensurability, temperature, and driving force are in good agreement with the early predictions by Reichhardt et al. [Phys. Rev. Lett. 78, 2648 (1997)] based on molecular dynamic simulations. [less ▲]

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See detailDéveloppement de l'entre-soi communautaire dans les espaces résidentiels périurbains
Teller, Jacques ULg

in Déviance et Société (2009), 33

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See detailChaotic dynamics of a Bose-Einstein condensate coupled to a qubit
Martin, John ULg; Georgeot, B.; Shepelyansky, D. L.

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2009), 79

We study numerically the coupling between a qubit and a Bose-Einstein condensate (BEC) moving in a kicked optical lattice, using Gross-Pitaevskii equation. In the regime where the BEC size is smaller than ... [more ▼]

We study numerically the coupling between a qubit and a Bose-Einstein condensate (BEC) moving in a kicked optical lattice, using Gross-Pitaevskii equation. In the regime where the BEC size is smaller than the lattice period, the chaotic dynamics of the BEC is effectively controlled by the qubit state. The feedback effects of the nonlinear chaotic BEC dynamics preserve the coherence and purity of the qubit in the regime of strong BEC nonlinearity. This gives an example of an exponentially sensitive control over a macroscopic state by internal qubit states. At weak nonlinearity quantum chaos leads to rapid dynamical decoherence of the qubit. The realization of such coupled systems is within reach of current experimental techniques. [less ▲]

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See detailP2X1 Ion Channels Promote Neutrophil Chemotaxis through Rho Kinase Activation
Lecut, Christelle ULg; Frederix, Kim ULg; Johnson, Daniel M et al

in Journal of Immunology (2009)

This study shows that activation of P2X1 ion channels by ATP promotes neutrophil chemotaxis, a process involving Rho kinase-dependent actomyosin-mediated contraction at the cell rear. These ion channels ... [more ▼]

This study shows that activation of P2X1 ion channels by ATP promotes neutrophil chemotaxis, a process involving Rho kinase-dependent actomyosin-mediated contraction at the cell rear. These ion channels may therefore play a significant role in host defense and inflammation. [less ▲]

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See detailMorphological and allozyme variation in a collection of Lagenaria siceraria (Molina) Standl. from Côte d'Ivoire
Koffi, K. K.; Baudoin, Jean-Pierre ULg; Malice, Marie et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(2), 257-281

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See detailUtilisation des enzymes en alimentation porcine et avicole
Beckers, Yves ULg; Piron, Fabien ULg

in CRA-W (Ed.) Impact de l'alimentation sur la santé animale : nouveaux développements (2009)

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See detailQu'est-ce que la relativité générale?
De Rop, Yves ULg

Article for general public (2009)

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See detailLa connaissance partielle chez le patient : pourquoi et comment la mesurer
Leclercq, Dieudonné ULg

in Education Thérapeutique du Patient [=ETP] = Therapeutic Patient Education [=TPE] (2009), 1(2), 201-212

Introduction: The certainty or the doubt, justified or not, a patient has in his knowledge about his illness influences largely his decision to act or, on the contrary, to verify, to ask for help ... [more ▼]

Introduction: The certainty or the doubt, justified or not, a patient has in his knowledge about his illness influences largely his decision to act or, on the contrary, to verify, to ask for help. Nevertheless, in the process of knowledge assessment, in patient education as well as in classical training systems, respondants are too rarely asked to provide, in addition to each answer to each question, a degree of certainty. Objectives: This paper explains how to collect these degrees of certainty, namely with the help of a spectral test applied in oral mode, and how to interpret and use these data in a formative perspective. Description:Metacognitive concepts and indices are developed and illustrated as well as graphical representations. Examples are provided in the domain of diabetic patients education. Conclusions: Spectral analysis of the responses’ qualities is useful to measure individual patients’ degree of mastery as well as to evaluate the efficacy of a training applied to a group of patients. [less ▲]

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See detailSurvey of air-ice ocean carbon dioxyde exchange over arctic sea-ice
Heinesch, Bernard ULg; Aubinet, Marc ULg; Carnat, Gauthier et al

Conference (2009)

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See detailImproving in-row weed detection in multispectral stereoscopic images
Piron, Alexis ULg; Leemans, Vincent ULg; Lebeau, Frédéric ULg et al

in Computers & Electronics in Agriculture (2009), 69

Previous research has shown that plant height and spectral reflectance are relevant features to classify crop and weeds in organic carrots: classification based on height gave a classification accuracy ... [more ▼]

Previous research has shown that plant height and spectral reflectance are relevant features to classify crop and weeds in organic carrots: classification based on height gave a classification accuracy (CA) of up to 83% while classification based on a combination of three multispectral bands gave a CA of 72%. The first goal of this study was to examine the simultaneous use of both height and multispectral parameters. It was found that classification rate was only slightly improved when using a feature set comprising both height and multispectral data (2%). The second goal of this study was to improve the detection method based on plant height by setting an automatic threshold between crop and weeds heights, in their early growth stage. This threshold was based on crop row determination and peak detection in plant height probability density function, corresponding to the homogeneous crop population. Using this method, the CA was 82% while the CA obtained with optimal plant height limits is only slightly higher at 86%. [less ▲]

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See detailEffects of aging and daytime recovery sleep on N-REM slow oscillations
Lafortune, M; Viens, I; Poirier, G et al

in Sleep (2009), 32(Suppl. 1),

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