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Peer Reviewed
See detailComparaison de la valeur alimentaire du foin déshydraté et de l'ensilage d'herbe dans la ration pour vaches laitières
Nicks, Baudouin ULg; Bienfait, Jean-Marie ULg; Lambert, J. et al

in Annales de Médecine Vétérinaire (1979)

Detailed reference viewed: 61 (2 ULg)
See detailComparaison de logiciels pour l'étude par simulations de méthodes non paramétriques d'analyse de modèles à deux critères de classification.
Carletti, Isabelle

Master of advanced studies dissertation (2002)

Detailed reference viewed: 27 (7 ULg)
Peer Reviewed
See detailComparaison de méthodes de cubage d'arbres abattus
Palm, Rodolphe ULg

in Revue Forestière Française (1976), 28(1), 48-54

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See detailComparaison de MNTs générés à partir de données LiDAR terrestre et de photographies aériennes prises à basse altitude
Ouedraogo, Mohamar ULg

Scientific conference (2012, November 29)

In this presentation we compare DEMs generated using terrestrial LIDAR and UAV data. The study site is a small agricultural watershed located near the region of Gembloux in Belgium. Terresttrial LiDAR ... [more ▼]

In this presentation we compare DEMs generated using terrestrial LIDAR and UAV data. The study site is a small agricultural watershed located near the region of Gembloux in Belgium. Terresttrial LiDAR data was collected using Trimble GX trought 14 scans. After correcting errors by using statistical approach, scans are meshed to generate a DEM of 1 m x 1 m resolution. UAV data was collected using the X100 UAV commercialized by gatewing. Data was processed in the open source MICMAC software to generate a DEM of 1 m x 1 m resolution. DEMs comparison to ground control points surveyed by RTK GPS, showed that DEM generated using terrestrial LiDAR data is the most precise with a RMSE of 4.9 cm compare to the DEM from UAV data which RMSE was 9.0 cm. [less ▲]

Detailed reference viewed: 38 (6 ULg)
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See detailComparaison de modèles agrométéorologiques de type statistique empririque construits à partir de différents ensembles de variables météorologiques
Palm, Rodolphe ULg; De Bast, A.; Lahlou, M.

in Bulletin des Recherches Agronomiques de Gembloux (1991), 26(1), 71-89

On compare des modèles agrométéorologiques de type statistique empirique construits à partir de différents ensembles de variables météorologiques et destinés à prévoir les rendements en maïs dans une ... [more ▼]

On compare des modèles agrométéorologiques de type statistique empirique construits à partir de différents ensembles de variables météorologiques et destinés à prévoir les rendements en maïs dans une série de départements français. La qualité des ajustements est très satisfaisante, pour autant qu'on dispose d'un nombre suffisant de variables explicatives potentielles, mais la valeur prédictive des modèles construits est nulle, puisque leur utilisation introduit une variable supplémentaire. On montre également que l'étude des résidus prédits par la méthode du "jackknife" ne permet pas d'apprécier valablement la qualité du modèle. [less ▲]

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See detailComparaison de plusieurs types d'unités d'échantillonnage dans la perspective d'un inventaire forestier régional.
Lecomte, H.; Hebert, Jacques ULg; Rondeux, Jacques ULg

in Forestry Chronicle (1994), 70(3), 304-310

This study has been conducted in order to define the guidelines of a permanent forest inventory methodology that could applied to heterogenous forests located in the southern part of Belgium. Different ... [more ▼]

This study has been conducted in order to define the guidelines of a permanent forest inventory methodology that could applied to heterogenous forests located in the southern part of Belgium. Different types of sampling units generally used in European national inventories have been compared: fixed area sampling units (based upon 3 concentric circles), non fixed-area sampling units (Bitterlich plots using basal area factor of 2 and 4) and sampling units based upon a minimum number of trees (including nearly 15 measurable trees). In true conditions of application 259 sampling points have been selected according to a systematic rectangular grid (1.000 m x 500 m). Taking into account different criteria such as precision, cost and ease of use, the fixed-area sampling unit looks like the most adequate among the four types investigated. [less ▲]

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See detailComparaison de quatre modalités de présentation du blé chez le poulet de chair
Piron, Fabien ULg; Philippart de Foy, Martin; Thewis, André ULg et al

in journées de la recherche avicole (2007)

This study investigated the influence of four modalities of wheat (Triticum aestivum L.) presentations on the performances and digestive tract characteristics of broilers (Ross). The variety of wheat was ... [more ▼]

This study investigated the influence of four modalities of wheat (Triticum aestivum L.) presentations on the performances and digestive tract characteristics of broilers (Ross). The variety of wheat was Meunier. The first dietary treatment (Milled) corresponded to milled wheat (hammer mill, sieve of 3 mm). The second treatment (Rolled) was related to rolled wheat. The third dietary treatment (Whole-Advanced) corresponded to 10 % whole wheat for first week of study (d 10 to d 17), 20 % whole wheat for second week of study (d 17 to d 24) and 30 % after d 24. The fourth treatment (Whole-Belated) was similar to the third, except a delay equals to 1 week (10 % for d 17 to d 24, 20 % for d 24 to d 31 and 30 % after d 31). Except for the first week of study, intake of Milled was inferior (p < 0.05) to other treatments. From the second week (between d 17 and d 24), growth related to Rolled was higher (p < 0.05) than two whole wheat treatments. From the third week (between d 24 and d 31), growth related to Rolled was also higher (p < 0.05) than Milled. Cumulated feed conversion ratio (FCRc) of Milled and Rolled was better (p < 0.05) than FCRc of whole wheat treatments (30 % of whole grain in fine). With this two whole wheat incorporation schemes, 20 or 30 % of whole grain was superior (p < 0.05) to Milled for FCR. The gizzards of broilers related to whole wheat were proportionally heavier (p < 0.05) than gizzards associated to Milled or Rolled. Rolled was not different (p > 0.05) from Milled for weights of gizzards. [less ▲]

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See detailComparaison de quatre variétés de blé d’hiver : effets de différents critères physico-chimiques sur les performances zootechniques du poulet
Piron, Fabien ULg; Beckers, Yves ULg; Ounissi, Kamel et al

in Journées de la Recherche Avicole (2005)

This study investigated the influence of some physic and chemical parameters of wheat grains on the performances of broilers (Ross). Four varieties (Agami, Corvus, Folio et Meunier) were grown on a single ... [more ▼]

This study investigated the influence of some physic and chemical parameters of wheat grains on the performances of broilers (Ross). Four varieties (Agami, Corvus, Folio et Meunier) were grown on a single site in harvest year 2003. This cultivar samples are ground and included in starter (57.6 % of wheat) and growth diets (61.4 % of wheat). Broiler’s intake was not influenced (p > 0.05, n = 24) by varieties. But weights of chicken (38 days) were (p < 0.05, n = 516) higher with Folio and Meunier. Feed conversion ratios cumulated between day 3 to day 38 (FCR) were (p < 0.05, n = 24) lower with Folio and Meunier than with Corvus and Agami. Hardness was negatively correlated with FCR (r = - 0.60, p < 0.01, n = 4). The correlation between crude proteins and FCR was equal to - 0.70 (p < 0.001, n = 4). FCR was negatively correlated to Zeleny’s index (r = - 0.62, p < 0.01, n = 4), wet (r = - 0.66, p < 0.001, n = 4) and dry gluten (r = - 0.51, p < 0.05, n = 4). FCR was negatively correlated to ratio of large (> 1800 μm) particles in ground wheat (r = - 0.48, p < 0.05, n = 4) and also related to small (< 707 μm) material (r = 0.53, p < 0.01, n = 4). Surprisingly, FCR was negatively correlated with amounts of soluble Non-Starch Polysaccharides and soluble Arabinoxylans. The same pathway was observed with in vitro viscosity data. Intestinal viscosities were not related (p > 0.05, n = 24) to broiler’s performances. [less ▲]

Detailed reference viewed: 64 (14 ULg)
See detailComparaison de quatre varietés de maïs dans l'engraissement du taurillon
Clinquart, Antoine ULg; Gielen, Marc ULg; Dufrasne, Isabelle ULg et al

in VIèmes Journées des Recherches sur l'Alimentation et la Nutrition des Herbivores (1990)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailComparaison de quelques tarifs de cubage pour l'épicéa commun
Palm, Rodolphe ULg

in Bulletin de la Société Royale Forestière de Belgique = Tijdschrift van de Koninklijke Belgische Bosbouwmaatschappij (1976), 83

Detailed reference viewed: 13 (0 ULg)
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See detailComparaison de techniques CND émergentes sur des pièces aéronautiques en matériaux composites
Georges, Marc ULg; Thizy, Cédric ULg; Lewandowski, Jacques et al

Conference (2013, November)

Detailed reference viewed: 26 (2 ULg)
Peer Reviewed
See detailComparaison de techniques de calcul des équations de calibrage en analyse des protéines du blé par spectrophotométrie de réflexion dans le proche infrarouge
Dagnelie, P.; Dardenne, P.; Palm, Rodolphe ULg et al

in Bulletin des Recherches Agronomiques de Gembloux (1991), 26(3), 323-336

Dans le cas des protéines du blé tendre, on étudie l'incidence, sur la qualité des équations de calibrage, des transformations appliquées aux spectres bruts (lissage par calcul des moyennes mobiles ... [more ▼]

Dans le cas des protéines du blé tendre, on étudie l'incidence, sur la qualité des équations de calibrage, des transformations appliquées aux spectres bruts (lissage par calcul des moyennes mobiles, dérivées premières, dérivées secondes et calcul des coefficients de FOURIER) et des procédures de réduction préliminaire du nombre de longueurs d'onde prises en considération (choix systématique et choix basé sur la corrélation entre réponses aux longueurs d'onde voisines). [less ▲]

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See detailComparaison de techniques de débruitage des images scintigraphiques
Kirkove, Murielle ULg; Seret, Alain ULg

in Médecine nucléaire (2007), 31(5), 219-234

Scintigraphic images are strongly affected by Poisson noise. This article presents the results of a comparison between denoising methods for Poisson noise according to different criteria: the gain in ... [more ▼]

Scintigraphic images are strongly affected by Poisson noise. This article presents the results of a comparison between denoising methods for Poisson noise according to different criteria: the gain in signal-to-noise ratio, the preservation of resolution and contrast, and the visual quality. The wavelet techniques recently developed to denoise Poisson noise limited images are divided into two groups based on: (1) the Haar representation, (2) the transformation of Poisson noise into white Gaussian noise by the Haar–Fisz transform followed by a denoising. In this study, three variants of the first group and three variants of the second, including the adaptative Wiener filter, four types of wavelet thresholdings and the Bayesian method of Pizurica were compared to Metz and Hanning filters and to Shine, a systematic noise elimination process. All these methods, except Shine, are parametric. For each of them, ranges of optimal values for the parameters were highlighted as a function of the aforementioned criteria. The intersection of ranges for the wavelet methods without thresholding was empty, and these methods were therefore not further compared quantitatively. The thresholding techniques and Shine gave the best results in resolution and contrast. The largest improvement in signal-to-noise ratio was obtained by the filters. Ideally, these filters should be accurately defined for each image. This is difficult in the clinical context. Moreover, they generate oscillation artefacts. In addition, the wavelet techniques did not bring significant improvements, and are rather slow. Therefore, Shine, which is fast and works automatically, appears to be an interesting alternative. [less ▲]

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See detailComparaison de techniques de validation dynamique de données
Heyen, Georges ULg; Gerkens, Carine ULg; Mateus, Miguel et al

(2006, October)

Detailed reference viewed: 39 (7 ULg)
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See detailComparaison de trois approches pour l'estimation de l'incertitude.
Marini Djang'Eing'A, Roland ULg; Chiap, Patrice ULg; Boulanger, Bruno ULg et al

in Acta Clinica Belgica. Supplementum (2006), (1), 60-2

Three different approaches for the estimation of uncertainty measurements using the same analytical method were compared, namely validation, robustness and inter-laboratory studies. The uncertainty ... [more ▼]

Three different approaches for the estimation of uncertainty measurements using the same analytical method were compared, namely validation, robustness and inter-laboratory studies. The uncertainty obtained with the robustness study! predicted well the uncertainty of the inter-laboratory study. On the other hand, the uncertainty estimation obtained with the validation study is lower than those obtained with the two other approaches but is still acceptable as long as the analytical method will be used in a single laboratory. [less ▲]

Detailed reference viewed: 43 (7 ULg)
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See detailComparaison de trois méthodes d'apprentissage dans la maladie d'Alzheimer
Bier, Nathalie; Gagnon, Lise; Van der Linden, Martial et al

Poster (2003, May 23)

Detailed reference viewed: 18 (2 ULg)