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See detailResource Trading Agents for Adaptive Active Network Applications
Yamamoto, Lidia; Leduc, Guy ULg

in MOBILE AGENTS FOR TELECOMMUNICATION APPLICATIONS (2002)

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See detailDo Temperature Variations at the Surface of a Hot Non-Radial Pulsator Change Significantly the Line-Profile Variations?
De Ridder, J.; Aerts, C.; Dupret, Marc-Antoine ULg et al

in IAU Colloq. 185: Radial and Nonradial Pulsationsn as Probes of Stellar Physics (2002)

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See detailImproving the performance of low-gain designs for bounded control of linear systems
Grognard, F.; Sepulchre, Rodolphe ULg; Bastin, G.

in Automatica (2002), 38(11), 1777-1782

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See detailIn vitro culture of immature embryos of Phaseolus polyanthus Greenm. and Phaseolus vulgaris L.
Toussaint, André ULg; Clément, F.; Mergeai, Guy ULg et al

in Annual Report of the Bean Improvment Cooperative (2002), 45

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See detailA duality principle for homogeneous vector fields with applications
Moreau, Luc; Aeyels, Dirk; Peuteman, Joan et al

in Systems & Control Letters (2002), 47(1), 37-46

We introduce a duality principle for homogeneous vectorfields. As an application of this duality principle, stability and boundedness results for negative order homogeneous differential equations are ... [more ▼]

We introduce a duality principle for homogeneous vectorfields. As an application of this duality principle, stability and boundedness results for negative order homogeneous differential equations are obtained, starting form known results for positive order homogeneous differential equations. [less ▲]

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See detailDevelopment of a multibody model of a sprayer
Ooms, David ULg; Lebeau, Frédéric ULg; Maton, Nicolas et al

in Proceedings of AgEng (2002)

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different ... [more ▼]

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different types of booms and suspensions (double trapezium, trapezium, pendulum, …). This was obtained by creating a general model in which geometrical (dimensions) and mechanical parameters (mass and inertia, friction coefficients, stiffness and damping coefficients of the hinges, …) of the system were easily modified. A graphical interface especially designed authorised this easy modification. The validation of the model was obtained by measuring in real conditions the frame movements as solicitations and the boom movements as responses. The method was applied on a trailed sprayer equipped with a boom of 24 m and a trapezoidal suspension. Good accordance was found between measured and simulated vertical displacements. The model may decrease the development costs of suspension and boom designs. [less ▲]

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See detailMapping within-field soil variability for precision agriculture using electromagnetic induction
Hanquet, Bernard; Frankinet, Marc; Parez, Vincent et al

in Proceedings of AgEng (2002)

Among the crops production factors, the soil is obviously one of the most important. Therefore, within the context of Precision Agriculture, the spatial variability knowledge of its physical and chemical ... [more ▼]

Among the crops production factors, the soil is obviously one of the most important. Therefore, within the context of Precision Agriculture, the spatial variability knowledge of its physical and chemical properties is essential as a decision support information for cultural operations modulation. The purpose of this study is to assess the capability of electromagnetic induction sensing of apparent electrical conductivity (ECa) for the characterisation of withinfield variability of soil physical and/or chemical properties in the particular soil conditions encountered in our experimental area, namely non-saline deep silty soils. ECa maps were produced on a 7ha field in April 2001, September 2001 and April 2002. Concurrently, an intensive soil survey (112 points) was carried out in February 2001 in order to determine a series of physical, textural and chemical soil parameters. ECa accurately described clay content, and exchangeable K and Ca cations concentrations. [less ▲]

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See detailSpray controller for horizontal boom movements compensation
El Bahir, Loussain; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

in Proceedings of AgEng2002 (2002)

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension ... [more ▼]

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension but these methods show performance and price limitations. The purpose of this paper is to propose a spray controller aiming to compensate the effect of the horizontal boom movements on the spray distribution besides the effect of tractor speed variations. The controller is based on three main parts: a control law describing the relationship between nozzle speed, nozzle flow and spray coverage; a real time measurement of the boom horizontal speed variations using micro-machined capacitive accelerometers and Pulse Width Modulation (PWM) no zzle flow actuators. A prototype was developed using a processor board controller (dSpace) and tested on a laboratory test bench. The nigrosine solution spray coverage was measured using image analysis for field representative multi-sine nozzle speed variations. The spray coverage uniformity using the spray controller showed about 51% compensation of the spray coverage variations observed without controller. [less ▲]

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See detailApplication of image analysis to the identification and rating of road surface distress
Rasse, Catherine; Leemans, Vincent ULg; Destain, Marie-France ULg et al

in Correia; Branco (Eds.) Bearing Capacity of Roads, Railways and Airfields (2002)

Numerical image analysis is used to detect narrow cracks on bituminous pavement. This problem is complicated because of the variable road aspect, which depends on coarseness textures, changing ambient ... [more ▼]

Numerical image analysis is used to detect narrow cracks on bituminous pavement. This problem is complicated because of the variable road aspect, which depends on coarseness textures, changing ambient lighting, presence of humidity and because of the poor contrast of the cracks with regard to road texture. The paper presents algorithms suited to detect random cracks edges in a noisy environment in three stages. The pre-treatment consisted mainly in applying a background correction to eliminate the heterogeneity due to humidity, shade, ... In the treatment, a threshold value was applied to segment the 'object' from the rest of the image. As these objects may be cracks, part cracks, or some noise erroneously segmented as defect, a post-treatment was applied to appreciate more accurately if a pixel belonged to an object or to the background. It aimed also to assembly parts of the cracks in continuous structure. When compared to visual detection, efficient detection of cracks is obtained. Further work needs to be done to get an automatic detection of the cracks whatever the road texture. [less ▲]

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See detailQuelles leçons tirer des expériences étrangères ?
Sibony, Anne-Lise ULg

in Breen, Emmanuel (Ed.) Évaluer la justice (2002)

Foreign experiences illustrate how quality of justice can be improved through a number of diverse methods. The creativity and thoroughness of some methods used in foreign jurisdictions invite us to revise ... [more ▼]

Foreign experiences illustrate how quality of justice can be improved through a number of diverse methods. The creativity and thoroughness of some methods used in foreign jurisdictions invite us to revise our preconceptions such as the supposed impossibility of evaluating judicial performance and maintaining an independent judiciary. Comparing national experiences makes it possible to identify questions which should be answered in designing quality of justice evaluation systems, including obstacles to be avoided and necessary conditions for any such system to improve quality of justice effectively. [less ▲]

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See detailLes éclairages des expériences étrangères
Sibony, Anne-Lise ULg

in Cavrois, Marie-Luce; Dalle, Hubert; Jean, Jean-Paul (Eds.) La qualité de la justice (2002)

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See detailLes débuts du paléolithique supérieur dans le nord-ouest de l’Europe : le Lincombien-Ranisien-Jerzmanowicien (état de la question)
Flas, Damien ULg

in Anthropologica et Praehistorica : Bulletin de la Société Royale Belge d'Anthropologie et de Préhistoire (2002), 113

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See detailWhite-sided dolphin metallothioneins: purification, characterisation and potential role
Das, Krishna ULg; Jacob, Valérie; Bouquegneau, Jean-Marie ULg

in Comparative Biochemistry & Physiology Part C : Toxicology & Pharmacology (2002), 131(3),

Metallothioneins (MTs) were characterised in the kidneys of a white-sided dolphin Lagenorhynchus acutus stranded along the Belgian coast, displaying high levels of cadmium (Cd) and mercury (Hg) in liver ... [more ▼]

Metallothioneins (MTs) were characterised in the kidneys of a white-sided dolphin Lagenorhynchus acutus stranded along the Belgian coast, displaying high levels of cadmium (Cd) and mercury (Hg) in liver and kidney. The protein has two isoforms: MT-1 and MT-2. MT-1 binds Cu, Zn, Hg and Cd, while MT-2 only binds Zn, Hg and Cd. This suggests different metabolic functions for the two isoforms: MT-1 is mainly involved in Cu homeostasis; MT-2, which was fourfold more abundant than MT-1, detoxifies most of the accumulated cadmium. (C) 2002 Elsevier Science Inc. All rights reserved. [less ▲]

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See detailPlacental GH, IGF-I, IGF-binding protein-1 and leptin during a glucose challenge test in pregnant women : relation with maternal body weight, glucose tolerance, and birth weight
Verhaeghe, J.; Pintiaux, Axelle ULg; Van Herck, E. et al

in Journal of Clinical Endocrinology and Metabolism (2002), 87(6), 2875-2882

The prediction of birth weight may be improved by the measurement of hormones or growth factors in the mother. We measured body weight (BW) and plasma levels of placental GH (PGH), IGF-I, IGF-binding ... [more ▼]

The prediction of birth weight may be improved by the measurement of hormones or growth factors in the mother. We measured body weight (BW) and plasma levels of placental GH (PGH), IGF-I, IGF-binding protein-1 (IGFBP-1), and leptin at the time of the glucose challenge test (GCT) in 289 women, who were pregnant with a single fetus, between 24 and 29 wk gestational age (GA). Delivery occurred 12 +/- 2 (mean +/- SD) wk later. First, we examined which variables regulate these hormonal factors. Multiple regression showed that PGH concentrations were determined by GA at sampling and were negatively related to BW. IGF-I levels were mainly determined by PGH, and also by insulin, BW, and (negatively) age. IGFBP-1 concentrations were negatively determined by BW, insulin, and IGF-I. BW was also a powerful determinant of leptin levels, with insulin as a less robust determinant. Second, we examined the relation to glucose levels. PGH, IGF-I, and IGFBP-1 concentrations were not correlated with post-GCT glucose levels and were comparable in women with a normal or disturbed GCT (glucose >/=7.8 mmol/liter; n = 72). Finally, we examined the relation with birth weight and placental weight. Birth weight, corrected for GA and stratified into percentile groups, and the ponderal index at birth were strongly related to maternal BW, but not to maternal PGH, IGF-I, or IGFBP-1 levels. Neither was maternal leptin related to birth weight, but leptin concentrations were slightly higher in women who delivered obese babies. Placental weight was not related to any of the hormonal factors. This prospective study indicates that the variation in circulating PGH, IGF-I, IGFBP-1, and leptin between 24 and 29 wk of pregnancy is strongly dependent on maternal BW, but is unrelated to glucose tolerance. In addition, the measurement of PGH, IGF-I, IGFBP-1, or leptin at the time of the GCT is not useful clinically to predict birth weight. [less ▲]

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See detailRégénération de Phaseolus vulgaris L. et P. polyanthus Greenm. à partir d'embryons immatures en vue de leur hybridation interspécifique
Toussaint, André ULg; Geerts, P.; Clément, F. et al

in Actes des VIIIèmes Journées Scientifiques du Réseau "Biotechnologies, Amélioration des plantes et Sécurité alimentaire" (2002)

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See detaille nouvel article 65, alinéa 2 du code pénal et son application dans le temps
Monville, Pierre ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2002)

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