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See detailModèle de croissance pour les plantations de mélèzes.
Pauwels, D.; Lejeune, Philippe ULg; Rondeux, Jacques ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2003), 7(2), 87-97

A distance independent tree growth model has been determined for pure and even-aged larch stands (Larix sp.) growing in Walloon Region (South Belgium). This model has been built from 2578 larches ... [more ▼]

A distance independent tree growth model has been determined for pure and even-aged larch stands (Larix sp.) growing in Walloon Region (South Belgium). This model has been built from 2578 larches (Japanese, European and Hybrid larches) in 99 stands. It enables to predict tree circumference increment from circumference, dominant height, basal area, age and site index of stands. Estimating increments of 1283 larches in 48 stands has been used to validate the model that gives unbiased estimates of the increments (mean error = -0.002 cm with standard deviation of 0.60 cm). The mean absolute error of estimates is 0.46 cm.year-1. The model has also been tested to predict the increment of larches in French experimental plots having very different silvicultural treatments. The residues of these estimations depend on the stand basal area: the lesser the stand basal area, the higher the residues of the estimation. A correction factor, linked to basal area through a Bailey and Clutter curve, has been introduced to extend the validity of the model to stands with a basal area lower than 12 m2.ha-1. This factor does not affect the increment estimations if the stand characteristics are close to mean value of the sample used to build the model (correction factor close to 1). The introduction in the model of competition indexes distance dependant or site qualitative variables does not significantly improve the growth model. [less ▲]

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See detailModèle de culture des chondrocytes équins ein billes d'alginate soumis à differentes tensions d'oxygène
Schneider, Nicole ULg

Master of advanced studies dissertation (2001)

Introduction : Les atteintes dégénératives articulaires chez les chevaux sont caractérisées par une dégradation continue du cartilage. Comme le mécanisme de la pathogénie est mal connu, le travail sur les ... [more ▼]

Introduction : Les atteintes dégénératives articulaires chez les chevaux sont caractérisées par une dégradation continue du cartilage. Comme le mécanisme de la pathogénie est mal connu, le travail sur les modèles de culture in vitro afin de simuler la situation in vivo reste indispensable. Objectifs : le but du travail est d’étudier la réaction cellulaire des chondrocytes provenant de l’articulation interphalangienne distale, mis en billes d ’alginate et cultivés pendant 14 jours sous tension d ’oxygène variable de 1%, 5% ou 21%. Méthodes : Le cartilage articulaire équin a été récolté au niveau de l’articulation interphalangienne distale. Les chondrocytes libérés de leur matrice par digestion enzymatique ont été mis en culture en billes d’alginate (culture tridimensionnelle), dans un milieu bien défini, et exposés aux différentes tensions d’oxygène. La cinétique de croissance cellulaire a été étudiée par comptage cellulaire. L’évolution cellulaire a été observée en microscopie et la viabilité (cellules normales, en apoptose, en nécrose) a été objectivée par une coloration au Sytox Green et à l’Alexa fluor 488. Cette coloration fluorescente a été également utilisée pour une quantification globale. Résultats : La culture des chondrocytes articulaires équins en billes d’alginate permet aux cellules de se développer sans dédifférenciation jusqu’à 14 jours de culture aux trois tensions d’oxygène (21%, 5% et 1%). Le nombre de cellules reste quasiment constant durant les 8 premiers jours de culture, puis il décroît, particulièrement à la tension de 1%. L’aspect de la culture (matériel péricellulaire) est différent aux trois tensions d’oxygène. A 21%, le nombre de cellules en apoptose augmente à la fin de la culture, tandis qu’il diminue aux tensions d’oxygène de 5% et 1%. C’est à 1% d’oxygène qu’on trouve le pourcentage le plus élevé de cellules en apoptose et en nécrose après 8 et 11 jours de culture,et en nécrose après 14 jours de culture (statistiquement significatif). [less ▲]

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See detailModèle de distribution des Mimosoideae de l’Afrique centrale.
Ndayishimiye, J; Bigendako, M-J; Lejoly, Jean ULg et al

in van der Burgt, X; van der Maesen, J; Onana, J-M (Eds.) Systematics and Conservation of African Plants (2010)

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See detailUn modèle de document simple de gestion (DSG) applicable en propriété forestière privée wallonne
Jandrain, S.; Puissant, T.; Colson, Vincent ULg et al

Book (2006)

Most of the private forest owners don’t use a management plan especially in the case of woodlands scaterred in small compartments. Furthermore they generally miss documents compiling updated descriptive ... [more ▼]

Most of the private forest owners don’t use a management plan especially in the case of woodlands scaterred in small compartments. Furthermore they generally miss documents compiling updated descriptive information dealing with administrative data, stand and structure composition, ownership location, planning and control of silvicultural operations. A similar situation is observed as concerns maps and cartographic elements. The main objective of this paper is to present a simple information system based upon data easy to collect and suitable for a great number of forest properties whatever their sizes are. Informations from the forest are collected at the compartment’s level (planning unit defined by permanent boundaries) and are registered in a computerized data base so that any owner can make continuing use of information such as various repartitions (areas and species by age, by structure,..), digitized thematic maps (stand, soil, silvicultural operations,..). Such a system provided in option can be considered as a pragmatic decision support whose one of the main objectives is to assure the follow-up of compartments years after years. To support it, the setting up of a structure at a regional level should be very useful to the forest managers and also a way to better assist the private forest ownership in the frame of a regional forest policy taking attention to the general recommendations of sustainable management. [less ▲]

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See detailUn modèle de gestion informatisé pour les plantations d'épicéa commun en Ardenne belge
Lejeune, Philippe ULg; Thibaut, André; Pauwels, Dominique

in Les cahiers forestiers de Gembloux (2000), (24), 26

Norway spruce (Picea abies (L.) Karst.) is the first forest species devoted to production in the Wallonian region. Many private and public foresters have to face management problems for these stands ... [more ▼]

Norway spruce (Picea abies (L.) Karst.) is the first forest species devoted to production in the Wallonian region. Many private and public foresters have to face management problems for these stands : rotation length, definition of thinning type, harvesting scheduling, future income and profitability estimation, ... The management model presented in this article can give some answers to these questions. It is made of two components : on one hand, a growth model predicts stand growth in connection with site index and silvicultural parameters, and, on the other hand several modules compute silvicultural indicators (stability index, mortality rate, assortments, ...) and financial indicators (prediction of future incomes and profitability). The management model allows to test and compare in a flexible way different scenarios applicable to stands described by their initial stage (number of stems and basal area per hectare, dominant height). These tools are integrated in a spreadsheet application using Excel TM, which makes it very easy to use by the forest manager who wants to base his managment on objective criteria. [less ▲]

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See detailModèle de productivité et tarif de cubage des peuplements de teck (tectona grandis L. F.) au Sud-Bénin
Fonton, N. H.; Palm, Rodolphe ULg; Akossou, A. Y. J. et al

in Annales des Sciences Agronomiques du Bénin (2001), 2(2), 209-224

This study aims to build site index model and stem volume function of pure, even aged and relatively homogeneous teak stands in south Benin. The characteristics of the stands were obtained from the ... [more ▼]

This study aims to build site index model and stem volume function of pure, even aged and relatively homogeneous teak stands in south Benin. The characteristics of the stands were obtained from the inventory of 104 temporary plots sampled from stands with different ages and fertility. The stem analysis of 19 dominant trees wer used to establish, by serial regression, a model giving the evolution of top height according to the age. The site index curves were built in order to determine site index of the stands. The estimated volume function obtained shows that age, site index and basal area are the main stand parameters of stem volume funtion. [less ▲]

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See detailLe modèle de Rasch, Modèle statistique permettant d’évaluer les compétences des élèves dans le domaine de la lecture
Demonty, Isabelle ULg; Schillings, Patricia ULg

in Actes du 20e colloque international de l’Admée-Europe. 16e colloque international de l'ADMEE-Europe. Entre la régulation des apprentissages et le pilotage des systèmes: évaluations en tension (2009)

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See detailModèle de simulation des performances d'une chaudière fioul à condensation de chauffage domestique
Makaire, Danielle ULg; Ngendakumana, Philippe ULg

in Energies et transports durables : SFT10, Le Touquet 25-28 mai 2010 (2010, May)

The developed model in this work is similar to a classical model of a conventional boiler (combination of a combustion chamber and a water-flue gas heat exchanger) to which a model of a heat exchanger for ... [more ▼]

The developed model in this work is similar to a classical model of a conventional boiler (combination of a combustion chamber and a water-flue gas heat exchanger) to which a model of a heat exchanger for condensation has been added. This latter has been simulated by a cooling coil divided into several elements The developed model has been applied on a condensing whose nominal useful power is 24.6 KW. After the determination of the nominal parameters, tests have been performed to validate the model in different working conditions of the boiler. The two main parameters whose influence has been investigated are : the return water temperature and the overall excess air. [less ▲]

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See detailLe modèle des événements d'apprentissage-Enseignement
Leclercq, Dieudonné ULg; Poumay, Marianne ULg

Learning material (2008)

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See detailLe modèle du "Rex Praedicator" alcuinien
Close, Florence ULg

Scientific conference (2008, February 28)

Nourri de la pensée politique de Grégoire le Grand, le conseiller anglo-saxon de Charlemagne, Alcuin (†804) a, dès son arrivée à la cour, encouragé le roi à être "rector" et "defensor" du peuple chrétien ... [more ▼]

Nourri de la pensée politique de Grégoire le Grand, le conseiller anglo-saxon de Charlemagne, Alcuin (†804) a, dès son arrivée à la cour, encouragé le roi à être "rector" et "defensor" du peuple chrétien. L'année 798 constitue un tournant dans la conception alcuinienne du pouvoir royal. A l'appui des préceptes dispensés dans la "Regula pastoralis", rédigée à la fin du 6e siècle par le pape Grégoire Ier, Alcuin exhorte Charlemagne à prendre personnellement part à la mission d'enseignement des pasteurs : c'est alors qu'apparaît le modèle du "rex praedicator". Cette communication consistait en un retour sur les circonstances politiques et religieuses dans lesquelles le modèle alcuinien du bon roi s'est affiné. Elle fut l'occasion d'apporter quelques éléments de réponses à la question de savoir pourquoi Alcuin s'était employé à promouvoir la "Regula pastoralis" de Grégoire le Grand dans l'entourage immédiat du souverain carolingien. [less ▲]

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See detailUn modèle en pistes causales pour appréhender la complexité du phénomène d'accrochage scoalire lors de la transition primaire-secondaire
Poncelet, Debora; Lafontaine, Dominique ULg

in Mesure et Evaluation en Education [=MEE] (2011), 34(1), 55-95

Detailed reference viewed: 66 (15 ULg)
See detailLe modèle européen
Martiniello, Marco ULg

Scientific conference (2001, November 23)

Peer Reviewed
See detailModèle hybride Euler-Lagrange pour la description des hétérogénéités dans les bioréacteurs.
Delafosse, Angélique ULg; Delvigne, Frank ULg; Collignon, Marie-Laure ULg et al

in SFGP (Ed.) Récents Progrès en Génie des Procédés - N° 101 - Des procédés au service du produit au coeur de l'Europe - Actes du XIIIème Congrès de la société Française de Génie des Procédés - Du 29 Nov. au 1er Décembre 2011 - Lille Grand Palais, FRANCE (2011, November 29)

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See detailModèle hydrogéologique en zone aride ou semi-aride
Dassargues, Alain ULg; Monjoie, Albéric ULg

in Génie para-sécheresse en zone aride (1990, March 12)

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See detailModèle Hydrologique Basé sur la Physique du Ruissellement Applicable à des Terrains Naturels Digitalisés
Pirotton, Michel ULg

in 24èmes journées de l'Hydraulique (1996, September 18)

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See detailModèle Hydrologique Conceptuel Distribué d'Écoulement Quasi-Tridimensionnel en Fine Lame sur Bassin Versant
Pirotton, Michel ULg

in Research and Development in the Field of Dams (1995)

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See detailUn modèle log-linéaire d'analyse du vote écologiste
Jacquemain, Marc ULg; Discry, Anne

Conference (1992, January)

The eighties have seen, in different countries among Europe , the emergence of new ecologist parties. In frenchspeaking Belgium, the constituency of this party is very peculiar with a very low average age ... [more ▼]

The eighties have seen, in different countries among Europe , the emergence of new ecologist parties. In frenchspeaking Belgium, the constituency of this party is very peculiar with a very low average age and a very high level of education, among others. Multivariate linear analysis of those variables shows a good deal of overlapping and interaction. Log-linear analysis that does not suppose neither continuity nor even the ordinal nature of those variables helps greatly to shwo where ecological constituency is. In particular, we tested the idea that rather then circumscribing a very educated population, it could be characteristics of some professionals areas, like social workers. [less ▲]

Detailed reference viewed: 18 (0 ULg)