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See detailEmpirical regression models using NDVI, rainfall and temperature data for the early prediction of wheat grain yields in Morocco
BALAGHI, Riad; Tychon, Bernard ULg; EERENS, Herman et al

in International Journal of Applied Earth Observation and Geoinformation (2008), 10

In Morocco, no operational system actually exists for the early prediction of the grain yields of wheat (Triticum aestivum L.). This study proposes empirical ordinary least squares regression models to ... [more ▼]

In Morocco, no operational system actually exists for the early prediction of the grain yields of wheat (Triticum aestivum L.). This study proposes empirical ordinary least squares regression models to forecast the yields at provincial and national levels. The predictions were based on dekadal (10-daily) NDVI/AVHRR, dekadal rainfall sums and average monthly air temperatures. The Global Land Cover raster map (GLC2000) was used to select only the NDVI pixels that are related to agricultural land. Provincial wheat yields were assessed with errors varying from 80 to 762 kg ha 1, depending on the province. At national level, wheat yield was predicted at the third dekad of April with 73 kg ha 1 error, using NDVI and rainfall. However, earlier forecasts are possible, starting from the second dekad of March with 84 kg ha 1 error, at least 1 month before harvest. At the provincial and national levels, most of the yield variation was accounted for by NDVI. The proposed models can be used in an operational context to early forecast wheat yields in Morocco. [less ▲]

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See detailEmpirical Relationship between Precision and Ultra-Trace Concentrations of Pcdd/Fs and Dioxin-Like Pcbs in Biological Matrices
Eppe, Gauthier ULg; Van Cleuvenbergen, Rudy; Smastuen Haug, Line et al

in Chemosphere (2008), 71(2), 379-87

Dioxin analysis in food and feed can be characterized as an analytical application where very high accuracy is required at very low levels of contamination. Gas chromatography (GC) in combination with (13 ... [more ▼]

Dioxin analysis in food and feed can be characterized as an analytical application where very high accuracy is required at very low levels of contamination. Gas chromatography (GC) in combination with (13)C-label isotope dilution (ID) high resolution mass spectrometry (HRMS) is the reference congener-specific technique characterized by pronounced selectivity, precision and trueness at parts-per-trillion (ppt) and sub-parts-per-trillion (sub-ppt) levels. The quality of the analytical data produced routinely by a laboratory should be adequate for its intended purpose, i.e., one will seek a compromise between the cost and time needed and the consequences of incorrect decisions due to erroneous results. The requirements for reproducibility are usually dependent on the analyte concentrations and have been expressed in various empirical functions. While Horwitz or modified functions are widely useful for many purposes, it would be difficult to expect these functions to cover every analytical problem. This study reports on precision characteristics achieved by the GC-ID-HRMS reference method for polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (DL-PCBs) in food and feed in two interlaboratory method-performance studies among expert laboratories with long-standing experience in this field. Striking linear functions in log scale between reproducibility standard deviation and congener's level over a concentration range of 10(-8)-10(-14)g per g fresh weight are observed. The data fit very well to a Horwitz-type function of the form s(R)=0.153c(0.904), where s(R) and c are dimensionless mass ratios expressed in pgg(-1) on fresh weight, regardless of the nature of the toxic congeners, food and feed matrices, or sample preparation methods. We demonstrate that the proposed function is suitable for use as a fitness-for-purpose criterion for proficiency assessment in interlaboratory comparisons on dioxins and related compounds in food. [less ▲]

Detailed reference viewed: 80 (6 ULg)
See detailEmpirical research in education
De Landsheere, Gilbert ULg

Book published by UNESCO (1982)

Detailed reference viewed: 12 (0 ULg)
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See detailEmpirical study of departures from the excitation equilibrium of FeI in metal-poor stars.
Magain, Pierre ULg; Zhao, G.

in Astronomy and Astrophysics (1996), 305

A detailed analysis of neutral iron lines in a sample of 13 metal-poor dwarfs and subgiants is carried out on the basis of high resolution spectra obtained with the ESO Coude Echelle Spectrometer. The ... [more ▼]

A detailed analysis of neutral iron lines in a sample of 13 metal-poor dwarfs and subgiants is carried out on the basis of high resolution spectra obtained with the ESO Coude Echelle Spectrometer. The deduced iron abundance is found to depend on the excitation potential of the line used, higher excitation lines generally indicating higher abundances. This could be caused by departures from the local thermodynamic equilibrium (LTE) or by temperature inhomogeneities in the stellar atmospheres. The dependency of this effect on the stellar atmospheric parameters is investigated. From the comparison of iron lines with lines of other elements, it is concluded that the low excitation FeI lines are much more affected than the high excitation lines. The consequences of these effects for the classical abundance analyses are examined. It is found that they may explain, at least in part, some previously reported discrepancies between the results of different authors. [less ▲]

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See detailThe empirical study of norms of justice - an overview
Jacquemain, Marc ULg

Scientific conference (2003, April)

The paper discusses what is empirical study of justice feeling, drawing the line between this and normative study, but defending nevertheless that there are important linkis between both stances. It gives ... [more ▼]

The paper discusses what is empirical study of justice feeling, drawing the line between this and normative study, but defending nevertheless that there are important linkis between both stances. It gives an overview of main theories whitin normative study of justice feelings [less ▲]

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See detailEmplacement mechanism of the Tellnes ilmenite deposit (Rogaland, Norway) revealed by a combined magnetic and petrofabric study
Bolle, Olivier ULg; Diot, Hervé; Lambert, Jean-Marc et al

in Korneliussen, (Ed.) Abstracts – GEODE field workshop 8-12th July 2001 on ilmenite deposits in the Rogaland anorthosite Province, S. Norway (2001)

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See detailEmplacement of the Lyngdal granodiorite (SW Norway) at the brittle-ductile transition in a hot crust
Bogaerts, Michel; Scaillet, Bruno; Vander Auwera, Jacqueline ULg

in Geophysical Research Abstracts (2003), 5

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See detailL'emplâtre Isis et autres recettes d'origine égyptienne
Marganne, Marie-Hélène ULg

in Pardon-Labonnelie, Muriel (Ed.) La coupe d'Hygie. Médecine et chimie dans l'Antiquité (2013, June)

Study the context of emergence and spread of Isis plaster and other related recipes, which seem to come from an Egyptian priestly context.

Detailed reference viewed: 48 (7 ULg)
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See detailEmploi d'outils décisionnels et de pilotage de la fumure en région wallonne
Destain, Jean-Pierre ULg; Godden, Bernard; Luxen, Pierre et al

in Soudi, Brahim; Debouche, Charles; Krim, Lhassan (Eds.) et al Gestion environnementale de l'agriculture (2005, June 09)

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See detailL'emploi dans l'économie sociale marchande en Région wallonne
Fecher-Bourgeois, Fabienne ULg; Thiry, Bernard ULg; Raponi, Michael et al

Report (2004)

Detailed reference viewed: 27 (4 ULg)
See detailL'emploi dans l'économie sociale marchande en Région wallonne
Fecher-Bourgeois, Fabienne ULg; Thiry, Bernard ULg; Raponi, Michael et al

Report (2004)

Detailed reference viewed: 18 (7 ULg)
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See detailL’emploi de celeriter chez César : un cas d’étude du contexte des mots fréquents dans une œuvre
Denooz, Joseph ULg

in Denooz, Joseph; Dortu, Véronique; Steinmetz, Rudy (Eds.) Mosaïque, Mélanges offerts à Pierre Somville (2007)

Detailed reference viewed: 38 (8 ULg)
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See detailEmploi de l’air liquide dans la technique physiologique pour la congélation ou la mortification des tissus vivants
Fredericq, Léon ULg

in Bulletin de l'Académie Royale de Médecine de Belgique (1913), XXVI

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See detailEmploi de la paraffine dans la préparation de pièces anatomiques sèches
Fredericq, Léon ULg

in Zoologischer Anzeiger (1880), CXXIV

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See detailL'emploi des jeunes d'origine étrangère peu qualifiés (joepq) en Belgique. Phase exploratoire
Ould Kherroubi, Mehdi ULg

Conference (2012, September 12)

Ce document s'inscrit dans le cadre de la Chaire diversité et innovations sociales qui est un partenariat entre HEC-Liège (EGiD) et l’Université d’Hasselt (SEIN). Mobistar, GDF-Suez Electrabel et B ... [more ▼]

Ce document s'inscrit dans le cadre de la Chaire diversité et innovations sociales qui est un partenariat entre HEC-Liège (EGiD) et l’Université d’Hasselt (SEIN). Mobistar, GDF-Suez Electrabel et B-Holding (la Société Nationale des Chemins de fer Belge- SNCB) collaborent à cette recherche. Ma recherche se focalise sur l'emploi des jeunes d’origine étrangère peu qualifiés (JOEPQ) en Belgique abordé sous l’angle de la gestion. Ce document est le fruit d'entretiens exploratoires menés auprès de quatre agents d'insertion qui travaillent directement avec mon public-cible à Bruxelles. [less ▲]

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See detailEmploi des types de subordination dans un corpus ltin
Denooz, Joseph ULg

in Bodelot, Collette (Ed.) Morphologie, syntaxe et sémantique des subordonnants (2013)

Detailed reference viewed: 30 (13 ULg)