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See detailThe Sahelian drought may have ended during the 1990s
Ozer, Pierre ULg; Erpicum, Michel ULg; Demarée, Gaston et al

in Hydrological Sciences Journal = Journal des Sciences Hydrologiques (2003), 48(3), 489-492

The severe drought that affects the Sahel since the late 1960s has been very closely studied and monitored during the last three decades. Recently, after several wet years, it was questioned from a ... [more ▼]

The severe drought that affects the Sahel since the late 1960s has been very closely studied and monitored during the last three decades. Recently, after several wet years, it was questioned from a statistical point of view whether the drought was over. The conclusions of a recent study were that the rainfall deficit was not over at the end of 2000 and that the drought continues. The analysis of the change points in the station rainfall time series suggests differentiating these findings. There is now growing evidence that there is a potential shift towards a more humid state. However, the present analysis shows that the assumption that a significant increase in rainfall may have occurred around the early 1990s could only be verified at the customary confidence level in about 10 years from now. [less ▲]

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See detailSelection of the most efficient wavelength bands for 'Jonagold' apple sorting
Kleynen, O.; Leemans, Vincent ULg; Destain, Marie-France ULg

in Postharvest Biology & Technology (2003), 30(3), 221-232

This paper presents a method based on quadratic discriminant analysis to select the best filters for detecting a wide range of defects in 'Jonagold' apple fruit using a multi-spectral vision system ... [more ▼]

This paper presents a method based on quadratic discriminant analysis to select the best filters for detecting a wide range of defects in 'Jonagold' apple fruit using a multi-spectral vision system. Reflectance spectra of damaged and sound tissue were recorded using a visible/NIR spectrometer. Analysed defects consisted of scald, hail damage (with and without skin perforation), limb rubs, russets, scab tissue, frost damage, rot, visible flesh damage and recent bruises. Camera filter effects were approximated by summing the reflectances of all the wavelengths within the filter bandwidth. Combinations of three and four filters were tested and evaluated for discriminating damaged tissues from healthy ones. If a three-filter combination appeared sufficient to detect most of the damaged tissue, a four-filter combination should be considered for the complete sorting automation of this bicolour apple variety. A fourth filter was necessary to quantify the ratio between the blush and ground colours. Regarding recent bruise defects which represented the major difficulty, an image segmentation algorithm based on local contrast variations can enhance their detection. (C) 2003 Elsevier B.V. All rights reserved. [less ▲]

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See detailAnalysis of soil and crop properties for precision agriculture for winter wheat
Vrindts, Els; Reyniers, Marieke; Darius, Paul et al

in Biosystems Engineering (2003), 85(2), 141-152

In a precision farming research project financed by the Belgian Ministry of Small Trade and Agriculture, the methods of precision agriculture are tested on grain fields with a view of implementation of ... [more ▼]

In a precision farming research project financed by the Belgian Ministry of Small Trade and Agriculture, the methods of precision agriculture are tested on grain fields with a view of implementation of precision agriculture methods in Belgian field agriculture. The project encompasses methods for automatic information gathering on soil and crop and analysis of this data for management of within-field variability. Automatic information capturing is combined with traditional data sources of soil sample analysis and crop observations. The measurements and part of the results on one particular field in Sauvenière are presented here. Five nitrogen management strategies were compared, but the resulting differences in nitrogen dose were small and did not lead to significantly different yield results. The yield results were correlated to topography-related variations in soil texture and chemical components and to crop reflectance measurements in May. [less ▲]

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See detailStructural Optimization of the Blanc Pain Flood Control Gate
Rigo, Philippe ULg; Vercruysse, S.; Sarghiuta, R.

in Bulletin scientifique de l'UTCB (2003)

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See detailSensitivity analysis on ultimate strength of aluminium stiffened panels
Rigo, Philippe ULg; Sarghiuta, B.; Estefen, S. et al

in Marine Structures (2003)

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See detailMR2001084,Advanced electromagnetism and vacuum physics, Cornille, Patrick
Rochus, Pierre ULg

in Mathematical Reviews [=MR] (2003)

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See detailDevelopment Of Real-Time Pcr For The Rapid Detection Of Episomal Banana Streak Virus (Bsv)
Delanoy, Martine; Salmon, Marc ULg; Kummert, Jean et al

in Plant Disease (2003), 87(1), 33-38

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See detailHorizontal And Vertical Co2 Advection In A Sloping Forest
Aubinet, Marc ULg; Heinesch, Bernard ULg; Yernaux, Michel ULg

in Boundary-Layer Meteorology (2003), 108(3),

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See detailPopulation Genetic Structure Of Wild Phaseolus Lunatus (Fabaceae), With Special Reference To Population Sizes
Zoro Bi, I.; Maquet, A.; Baudoin, Jean-Pierre ULg

in American Journal of Botany (2003), 90(6), 897-904

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See detailCreolization in Robert Antoni's Blessed Is the Fruit: A Linguistic Analysis
Ledent, Bénédicte ULg

in Matatu : Journal for African Culture and Society (2003), 27-28

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See detailStructural integral monitoring by vibration measurements
Yan, Ai-Min; De Boe, Pascal; Golinval, Jean-Claude ULg

in FM2003 - Structural Integrity and Materials Aging (2003)

This paper presents a comparative study on several approaches of structural damage diagnosis based on vibration measurements. Stochastic subspace identification method is used to identify modal parameters ... [more ▼]

This paper presents a comparative study on several approaches of structural damage diagnosis based on vibration measurements. Stochastic subspace identification method is used to identify modal parameters and to generate a Kalman prediction model, which are taken as damage-sensitive features for structural damage detection. A statistical process control technique based on principal component analysis (PCA) is also presented. An improvement and enhancement of PCA are proposed. It is assumed that without damage, structural responses should remain approximately in a hyperplane defined by the principal directions of data. Damage localization is explored with these methods. As only the measured output signals are needed, the methods are convenient for an on-line monitoring. The efficiency and limitation of the proposed methods are illustrated by a practical application. [less ▲]

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See detailnote sous arrêt du 23 octobre 2003, Van den Bergh Foods contre Commission
Petit, Nicolas ULg

in Revue du Droit de l'Union Européenne (2003)

résumé et analyse de l'affaire Volkswagen AG contre Commission, affaire C-338/00

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See detailSimulations numériques d'essais de cisaillement simple
Flores, Paulo; De Montleau, P.; Habraken, Anne ULg et al

in 16ème Congrès fançais de Mécanique (2003)

Several tests have been designed in order to identify the initial yield locus and the parameters required in hardening laws. Taking into account the work done by Piljman (2001), M&S laboratory has started ... [more ▼]

Several tests have been designed in order to identify the initial yield locus and the parameters required in hardening laws. Taking into account the work done by Piljman (2001), M&S laboratory has started the construction of a bi-axial machien able to perform plane strain test, shear test (monotonic or cyclic), and a simultaneous combination of both. This article presents the simulation of a cyclic simple shear test using three types of hardening. [less ▲]

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See detailComparison of the Severity of Standards Used for the Vibration Testing of Luminaires
Marin, Frédéric; Golinval, Jean-Claude ULg; Marville, Christian et al

Conference given outside the academic context (2003)

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See detailLa peine de travail - Quelques observations pratiques
Jacobs, Ann ULg

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2003)

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See detailFundamentals of finite elements
Debongnie, Jean-François ULg

Book published by Les Editions de l'Université de Liège (2003)

This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this ... [more ▼]

This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this pioneering research team. [less ▲]

Detailed reference viewed: 126 (24 ULg)