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See detailSoigner le quotidien ou attiser l'intolérable ?
Bolmain, Thomas ULg

Scientific conference (2009, February 18)

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See detailLes grandes cultures et le CO2
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Dufranne, Delphine ULg et al

in Livre Blanc Céréales (2009, February 18)

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See detailLe retour du puritanisme
Jacquemain, Marc ULg

Conference given outside the academic context (2009)

Le texte tente d'esquisser dans quelle mesure et par quelles voies la progression d'une sensibilité démocratique peut se révéler défavorable à la liberté d'expression et peut susciter des demandes de ... [more ▼]

Le texte tente d'esquisser dans quelle mesure et par quelles voies la progression d'une sensibilité démocratique peut se révéler défavorable à la liberté d'expression et peut susciter des demandes de censure. Il vise à apporter une première réponse à la question posée par les organisateurs du colloque "sommes-nous devenus nos propres censeurs ?" [less ▲]

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See detailProtection contre les ravageurs - 2. Nouveautés, résultats 2008
Jacquemin, Guillaume; Mahieu, Alain; Berger, Agnès et al

in Livre Blanc: Céréales - Gembloux (2009, February 18)

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See detailCharacteristics of poultry production systems and cost-benefit analysis of mass vaccination campaign against HPAI in poultry production systems in Long An Province, South Vietnam
Phan Dang, Thang ULg; Peyre, Marisa; Vu Dinh, Ton et al

in Journal of Science and Development (2009), 7(English.Iss.1), 8

In 2006, the poultry population of Vietnam was about 215 million heads. However, between 2004 and 2008, the Highly Pathogenic Avian Influenza (HPAI) caused by H5N1 virus was broken in affected almost all ... [more ▼]

In 2006, the poultry population of Vietnam was about 215 million heads. However, between 2004 and 2008, the Highly Pathogenic Avian Influenza (HPAI) caused by H5N1 virus was broken in affected almost all provinces in Vietnam with millions of birds culled. This had large economical and sociological impacts. A question has been raised: how could Vietnam limit this epidemic? The research aims to identify the poultry production systems with their various constraints, including diseases and to evaluate the cost-benefit impact of a mass vaccination programme implemented from March to August 2007 at local level in Long An Province within the Mekong Delta. Two principal poultry farming systems are characterised: the commercial poultry production system (system 1) with low to moderate bio-security level, and the small-scale production system (system 2) with a low bio-security level. The scenarios of cost-benefit analysis of vaccination campaigns against HAPI caused by H5N1 virus give a good strategy for the restructure of poultry production and farmers’ incentives to vaccinate. The vaccination is more cost effective for the farmer than culling operations, with the BCR scenarios are between 31 to 78 times more. [less ▲]

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See detailPhân bố, đặc điểm và năng suất sinh sản của lợn Bản nuôi tại Hòa Bình
Vu Dinh, Ton; Phan Dang, Thang ULg

in Journal of Science and Development (2009), 7(2), 180-185

Ban swine is raised by households of ethnic minorities, especially Muong, in the remote communes of Hoa Binh province. This breed has several advantages such as good resistance to diseases, good quality ... [more ▼]

Ban swine is raised by households of ethnic minorities, especially Muong, in the remote communes of Hoa Binh province. This breed has several advantages such as good resistance to diseases, good quality of meat. This research was conducted from July 2007 to June 2008 to determine characteristics, distribution, reproductive performance of this swine breed through by the conventional method of survey such as recording body weight data and measuring the length and chest size on weekly and monthly bases. Ban swine has a black color of coat with white feet and belly. Their hairs are long and hard. They have small and erected ears, small face, long mouth, and weak back. The age at first farrowing was 13 months. The reproductive performance was low with a litter size of 5.58 for the first litter and 9.06 for the fourth (P<0.05). The average birth weight was 0.43 kg, weaning weight at 86.33 days of age was 5.05 kg. The farrowing interval was very long (241 days) with 40.46 days from weaning to re-breeding The average monthly gain was 1.49 kg for the suckling period. Feed Converson Ratio (FCR) up to weaning was very high (19 kg concentrate and 57.4 kg of forage/kg live weight). [less ▲]

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See detailRechercher en pratique une référence bibliographique sur un sujet donné
Pasleau, Françoise ULg

Conference (2009, February 14)

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See detailLe BCS, une méthode simple à la source de conseils variés : ration, repro et santé
Laloux, Laurent; Bastin, Catherine ULg; Gillon, Alain ULg et al

Poster (2009, February 11)

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See detailDécideurs, dites non à la « prime à la casse ».
Courbe, Pierre; Ozer, Pierre ULg

Article for general public (2009)

Le secteur automobile mondial se porte mal. Très mal. De mémoire de constructeur, on n’avait jamais vu cela. Les baisses de ventes enregistrées en 2008 et confirmées en janvier 2009 affolent les plus ... [more ▼]

Le secteur automobile mondial se porte mal. Très mal. De mémoire de constructeur, on n’avait jamais vu cela. Les baisses de ventes enregistrées en 2008 et confirmées en janvier 2009 affolent les plus sereins d’entre eux. La tornade ne frappe toutefois pas partout avec la même intensité. […] Une fois encore, l’environnement sert d’alibi alors que l’enjeu réel est le maintien sous perfusion d’une industrie en déclin. D’une industrie qui n’a pas su ni voulu identifier les prémices de son malaise actuel. […] [less ▲]

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See detailEvaluation de projets d’investissement en utilisant la simulation de Monte Carlo
BELAID, Fateh; de Wolf, Daniel ULg

Conference (2009, February 10)

L’exploration et le développement d’un champ pétrolier font face à de nom- breuses incertitudes liées aux rendements et aux coûts tout au long du cycle de vie du pro jet. A titre d’exemple les ... [more ▼]

L’exploration et le développement d’un champ pétrolier font face à de nom- breuses incertitudes liées aux rendements et aux coûts tout au long du cycle de vie du pro jet. A titre d’exemple les réserves, les investissements, les coûts opératoires, la production et le prix du pétrole sont souvent incertains. En conséquence, Il difficile de prévoir les cash-flows même pour les pro jets pétroliers les plus simples. Différentes méthodes sont disponibles pour aider les décideurs à évaluer les incertitudes, et réduire le risque des opportunités d’investissement en amont pétrolier. La simulation a été reconnue comme un outil d’analyse de risque et de prise de décision en évaluation de pro jets d’investissement en amont pétrolier au début des années 60. Aujourd’hui pra- tiquement toutes les grandes compagnies pétrolières ont incorporé la simulation dans leurs études de pro jets. Dans cet article, nous essayons d’expliquer les critères d’évalua- tion et d’analyse du risque de pro jets d’investissement en amont pétrolier basés sur les cash-flows et de montrer comment la simulation de Monte Carlo peut être utile dans ce cadre. [less ▲]

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See detailSélection du portefeuille de projets d'exploration production en utilisant la méthode de Markowitz
BELAID, Fateh; de Wolf, Daniel ULg

Conference (2009, February 10)

Deux caractéristiques importantes de l’investissement en exploration ou production pétrolière sont les montants financiers très importants en jeu et les incertitudes élevées. Pour ces raisons, l’analyse ... [more ▼]

Deux caractéristiques importantes de l’investissement en exploration ou production pétrolière sont les montants financiers très importants en jeu et les incertitudes élevées. Pour ces raisons, l’analyse du risque devrait être mise en oeuvre dans le processus d’évaluation et de sélection des projets. En fonction de leurs ressources disponibles, les compagnies pétrolières sélectionnent un ensemble de projets sur la base de certains critères : la valeur actuelle nette, le taux de rendement interne, l’indice de profitabilité, etc . . . Cependant, ces critères se révèlent insuffisants vu, d’une part, l’absence de la notion du risque qui est un élément essentiel de l’industrie pétrolière, et d’autre part, l’omission des interactions entre les différents projets. Dans ce travail, afin de pallier aux insuffisances de l’approche traditionnelle, nous appliquons une variante de la méthode de Markowitz afin de déterminer le portefeuille optimal de projets d’exploration ou production qui assure le meilleur compromis risque minimum-rendement maximun sous les diverses contraintes auxquelles l’entreprise est confrontée. Un cas pratique d’application de cette méthode à la sélection de projets d’exploitation pétrolière en Mer du Nord est présenté. Ce cas pratique permet d’illustrer l’influence du facteur prix du brut sur le choix du portefeuille. [less ▲]

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See detailComparaison avec les autres méthodes de mesure (au cabinet, MAPA)
Krzesinski, Jean-Marie ULg

Conference (2009, February 07)

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See detailOptimal Design and Dimensioning of Hydrogen Transmission Distribution Pipeline Networks
Andre, Jean; BRAC, Jean; de Wolf, Daniel ULg et al

Conference (2009, February 05)

This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determi- nation and the dimensioning problem. We define a solution ... [more ▼]

This work considers the problem of the optimal design of an hydrogen transmission network. This design problem includes the topology determi- nation and the dimensioning problem. We define a solution method that simultaneously looks for the least cost topology of the network and for the optimal diameter of each pipe. These two problems were generally solved separately these last years. The application to the case of development of future hydrogen pipeline networks in France has been conducted on several urban areas. [less ▲]

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See detailUsing OR techniques for projets selection in the petrol industy
BELAID, Fateh; de Wolf, Daniel ULg

Conference (2009, February 05)

Two important characteristics of petroleum exploration and production investment are the high nancial amounts and uncertainties. For these rea- sons, the risk analysis should be implemented in the ... [more ▼]

Two important characteristics of petroleum exploration and production investment are the high nancial amounts and uncertainties. For these rea- sons, the risk analysis should be implemented in the projects evaluation and the selection process. Depending on their available resources, petroleum companies choose a number of projects on the basis of some criteria: the net present value, internal rate of return, pro tability index However, these criteria appear to be insu cient if we consider, on the one hand, the ab- sence of risk idea which is an essential element of the petroleum industry, on the other hand the omission of the correlations and interactions between di erent projects. In this paper, in order to make up for the lacks of the traditional approach, we apply a variant of Markowitzs method to deter- mine the e cient portfolio exploration and production projects that insure the best compromise minimum risk-maximum return under the di erent constraints faced by the company. A practical application of this method about selection of petroleum exploration projects in the North Sea is pre- sented. This practical case illustrates the in uence of the crude price in the choice of the portfolio. [less ▲]

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See detailLa traduction dans la jurisprudence communautaire : entre non-discrimination et sécurité juridique
Sibony, Anne-Lise ULg; de Sadeleer, Nicolas

Conference (2009, February 03)

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See detailModélisation et résolution du problème de contact mécanique et son application dans un contexte multiphysique
Bussetta, Philippe ULg

Doctoral thesis (2009)

The mechanical contact is the problem of solids mechanics that presents the most difficult nonlinearity. The good resolution of the frictional contact problem is disrupted by the noniineaxity and the non ... [more ▼]

The mechanical contact is the problem of solids mechanics that presents the most difficult nonlinearity. The good resolution of the frictional contact problem is disrupted by the noniineaxity and the non differentiability of the contact's equations (stick/unstick and the initiation of sliding). Until now, no method could be used to resolve all contact problems. This work is focused on the methods of calculation of the mechanical contact in a more general way. It could be separated in two parts. The first one concerns the creation of the systems of equations and the algorithm of resolution. The methods more used are the Penalty Method and Lagrangian Augmented Method. Although these methods are simple, they are very difficult to use because the choice of the value of penalty coefficients (normal and tangential). For this reason, a new method, the "Lagrangian Augmented Adapted Method" is proposed. This new method is based on the Lagrangian Augmented Method and on the adaptation of the penalty coefficients. With it, the user does not need to choose the value of penalty coefficients. In addition, this method has the speed of the Penalty Method and the reliability of the Lagrangian Augmented Method. The second part of this work deals with the calculation of the mechanical contact under a spatial disctretization. The method more used is the "Point-Surface" Method. The contact is calculated between every point of one surface and the other surface. This method has many limits, as the representativeness and the regularity of the solution when the boundaries are deformable and irregular. Many researches are done on another method, the "Surface-Surface" Method based on the Mortar Element Method. The mechanical contact is calculated on each node of one surface in function of the two surfaces. With this method the solution is more regular and reliable. But the calculation of the mechanical contact is more difficult, so it can not be used to the three dimensional problems. An adaptation of this method has been proposed to the two and three dimensional problems. All these methods are tested on some academics and industrials multi-physical problems. [less ▲]

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See detailAffections du système reproducteur et équitation - quand les hormones s'en mêlent
Ponthier, Jérôme ULg; Deleuze, Stefan ULg

Conference given outside the academic context (2009)

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See detailDesign of interactive visualization of models and students data
Mazza, R; Mazzola, L; Glahn, C et al

Report (2009)

This document reports the design of the interactive visualizations of open student models that will be performed in GRAPPLE. The visualizations will be based on data stored in the domain model and student ... [more ▼]

This document reports the design of the interactive visualizations of open student models that will be performed in GRAPPLE. The visualizations will be based on data stored in the domain model and student model, and aim at supporting learners to be more engaged in the learning process, and instructors in assisting the learners. [less ▲]

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See detailThe Heliospheric Imagers Onboard the STEREO Mission
Eyles, Chris; Harrison, Richard; Davis, Chris et al

in Solar Physics (2009), 254

Mounted on the sides of two widely separated spacecraft, the two Heliospheric Imager (HI) instruments onboard NASA's STEREO mission view, for the first time, the space between the Sun and Earth. These ... [more ▼]

Mounted on the sides of two widely separated spacecraft, the two Heliospheric Imager (HI) instruments onboard NASA's STEREO mission view, for the first time, the space between the Sun and Earth. These instruments are wide-angle visible-light imagers that incorporate sufficient baffling to eliminate scattered light to the extent that the passage of solar coronal mass ejections (CMEs) through the heliosphere can be detected. Each HI instrument comprises two cameras, HI-1 and HI-2, which have 20° and 70° fields of view and are off-pointed from the Sun direction by 14.0° and 53.7°, respectively, with their optical axes aligned in the ecliptic plane. This arrangement provides coverage over solar elongation angles from 4.0° to 88.7° at the viewpoints of the two spacecraft, thereby allowing the observation of Earth-directed CMEs along the Sun -- Earth line to the vicinity of the Earth and beyond. Given the two separated platforms, this also presents the first opportunity to view the structure and evolution of CMEs in three dimensions. The STEREO spacecraft were launched from Cape Canaveral Air Force Base in late October 2006, and the HI instruments have been performing scientific observations since early 2007. The design, development, manufacture, and calibration of these unique instruments are reviewed in this paper. Mission operations, including the initial commissioning phase and the science operations phase, are described. Data processing and analysis procedures are briefly discussed, and ground-test results and in-orbit observations are used to demonstrate that the performance of the instruments meets the original scientific requirements. [less ▲]

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