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See detailAnglophones et Québécois, Flamands et Francophones : La répartition du pouvoir au sein du gouvernement belge et canadien
Reuchamps, Min ULg

Conference (2007, May 03)

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of ... [more ▼]

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of Daniel Elazar’s seminal work on federalism in plural societies and of Arend Lijphart’s on consociationalism offers a theoretical framework which can be usefully applied to study the distribution of power between the two main ethno-linguistic communities at the highest level of the state. Using the existing “model of points” and the author’s own “model of the weight of ministerial portfolios”, this paper explores the linguistic composition of the federal governments in both countries over the last thirty years (1970-2006). Whereas the Belgian Constitution has required since 1970 that the federal cabinet be staffed by an equal number of Flemish and Francophone ministers, the Canadian Constitution does not require such a linguistic parity and therefore leaves a greater freedom for the composition of the government. On this background, two logics may explain the linguistic composition in the two cases: a logic of transaction between the two main communities and a logic of representation. The paper opens, on the one hand, with the elaboration of the theoretical framework combining the works of Elazar and Lijphart and, on the other hand, with the construction of the two models. The framework and the models are applied to each case, emphasizing the logic of transaction and the logic of representation. On the basis of this examination, this paper concludes by suggesting that Flemish and Francophone Belgians as well and English and French Canadians benefit from the composition of the federal cabinet. The conclusion opens—new—ways and means to hinder political tensions in plural societies through the institutional arrangement. [less ▲]

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See detailEffect of the sowing date on physicochemical and fonctional properties of native starches extracted from European soft wheat (Triticum aestivum L.)
Lenartz, Jonathan; Massaux, Carine; Fernandez Pierna, J. A. et al

Conference (2007, May 02)

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See detailRecent evolution of stratospheric inorganic chlorine (Cly) inferred from long-term ground-based FTIR observations of HCl and ClONO2
Mahieu, Emmanuel ULg; Duchatelet, Pierre ULg; Zander, Rodolphe ULg et al

in Geophysical Research Abstracts (2007, May 02), 9

Over the past decades, the increase of the stratospheric inorganic chlorine (Cly) loading has been the major cause for the ozone layer depletion, a matter of particular concern because of its ... [more ▼]

Over the past decades, the increase of the stratospheric inorganic chlorine (Cly) loading has been the major cause for the ozone layer depletion, a matter of particular concern because of its anthropogenic nature. Fortunately, appropriate decisions have been defined and put into force at the international level, leading to regulations adopted within the frame of the Montreal Protocol and its Amendments and Adjustments, and aiming at the suppression of all chlorine-bearing source gas emissions. Since its formalization, the NDSC (Network for Detection of Stratospheric Change, recently renamed NDACC, Network for the Detection of Atmospheric Composition Change) has given high priority to the monitoring of Cly based on solar observations with Fourier transform infrared (FTIR) spectrometers operated at the ground. Within this context, high-resolution solar absorption spectra recorded at Northern and Southern mid-latitudes have been analyzed to retrieve total vertical column abundances of the two main inorganic chlorine species, i.e. HCl and ClONO2. At these latitudes and in the absence of chlorine activation, these two reservoirs account for more than 92% of the total Cly loading. In this contribution, column abundance time series of HCl and ClONO2 for both the Jungfraujoch (46.5°N) and Lauder (45°S) NDACC primary stations will be presented. Comparison of these measurements with the 3-D CTM KASIMA model predictions will be shown and discussed critically, with some focus on the time period following the peak loading. Related trends will be determined and compared to expectations deduced from the most recent emission scenarios. [less ▲]

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See detailSolar-like oscillation amplitudes and line-widths as a probe for turbulent convection in stars
Samadi, R.; Belkacem, Kevin ULg; Goupil, M*-J et al

in IAU Symposium (2007, May 01)

Excitation of solar-like oscillations is attributed to turbulent convection and takes place at the upper-most part of the outer convective zones. Amplitudes of these oscillations depend on the efficiency ... [more ▼]

Excitation of solar-like oscillations is attributed to turbulent convection and takes place at the upper-most part of the outer convective zones. Amplitudes of these oscillations depend on the efficiency of the excitation processes as well as on the properties of turbulent convection. We present past and recent improvements on the modeling of those processes. We show how the mode amplitudes and mode line-widths can bring information about the turbulence in the specific cases of the Sun and Alpha Cen A. [less ▲]

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2007, May 01)

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See detailIncreasing the Coverage of a Cooperative Internet Topology Discovery Algorithm
Donnet, Benoît ULg; Huffaker, Bradley; Friedman, Timur et al

in Proceedings IFIP/TC6 Networking (2007, May)

Recently, Doubletree, a cooperative algorithm for large-scale topology discovery at the IP level, was introduced. Compared to classic probing systems, Doubletree discovers almost as many nodes and links ... [more ▼]

Recently, Doubletree, a cooperative algorithm for large-scale topology discovery at the IP level, was introduced. Compared to classic probing systems, Doubletree discovers almost as many nodes and links while strongly reducing the quantity of probes sent. This paper examines the problem of the nodes and links missed by Doubletree. In particular, this paper's first contribution is to carefully describe properties of the nodes and links that Doubletree fails to discover. We explain incomplete coverage as a consequence of the way Doubletree models the network: a tree-like structure of routes. But routes do not strictly form trees, due to load balancing and routing changes. This paper's second contribution is the Windowed Doubletree algorithm, which increases Doubletree's coverage up to 16% without increasing its load. Compared to classic Doubletree, Windowed Doubletree does not start probing at a fixed hop distance from each monitor, but randomly picks a value from a range of possible values. [less ▲]

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See detailContribution à l'étude des cycles de Rankine de récupération de chaleur
Lemort, Vincent ULg; Cuevas, Cristian; Teodorese, Ion et al

(2007, May)

Ce papier présente tout d’abord un modèle de cycle de Rankine, dont l’expanseur est de type spiro-orbital. Ce modèle doit permettre d’orienter le design des différents éléments du cycle, mais aussi de ... [more ▼]

Ce papier présente tout d’abord un modèle de cycle de Rankine, dont l’expanseur est de type spiro-orbital. Ce modèle doit permettre d’orienter le design des différents éléments du cycle, mais aussi de prédire les performances du cycle pour des conditions opératoires imposées. Une méthode de comparaison des performances réalisées par différents fluides est ensuite proposée. Les résultats d’une étude expérimentale menée sur un prototype de cycle de Rankine de récupération de chaleur sont finalement présentés. Le modèle du cycle et la méthode de comparaison des performances des fluides ont été utilisés pour orienter le design de l’expanseur spiro-orbital et sélectionner le fluide de travail. [less ▲]

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See detailTopology optimization of microbeams including layer deposition manufacturing constraints
Lemaire, Etienne ULg; Rochus, Véronique; Fleury, Claude et al

Conference (2007, May)

As many manufacturing techniques, microfabrication methods possess limitations. Consequently, manufacturing constraints have to be considered during microsystems design process. Therefore, the direct use ... [more ▼]

As many manufacturing techniques, microfabrication methods possess limitations. Consequently, manufacturing constraints have to be considered during microsystems design process. Therefore, the direct use of automatic design tools like topology optimization is not possible. For instance, optimal topologies generally contain closed cavities that cannot be produced using the usual microfabrication techniques like layer deposition. The present paper intends to add a layer deposition constraint to the optimization problem using recent developments of CONLIN software. However, with this new optimization procedure we could observe that classical sensitivities filtering makes optimization problem rather unstable while filtering the density field itself keeps good convergence properties. [less ▲]

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See detailPreliminary Analysis of the TCP Behavior in 802.16 Networks
Perez, Jesus Arturo,; Donnet, Benoît ULg; Bonaventure, Olivier

in 1st WEIRD Workshop on WiMAX, Wireless and Mobility (2007, May)

Currently, broadband wireless access is gaining a great deal of interest from the networking research community. Particularly, the recently standardized WiMAX presents interesting perspectives, notably ... [more ▼]

Currently, broadband wireless access is gaining a great deal of interest from the networking research community. Particularly, the recently standardized WiMAX presents interesting perspectives, notably due to its capacity to offer consistent bandwidth and therefore consistent QoS. However, the behavior of network protocols, such as TCP, has not been studied in detail in a WiMAX environment. This is a problem that could slow down the widespread deployment of WiMAX. In this paper, we present preliminary results of the performance of TCP in a pre-WiMAX network. We are interested in the RTT and the relationship between the delay and packet loss rate. We find that TCP presents an acceptable cyclic behavior but with a high percentage of packet loss, 6.2%. We further notice some burst packet losses that vary in size and duration. Some of these bursts correspond to a packet loss rate of 100% during periods of up to one second. [less ▲]

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See detailFormer des enseignants efficaces et équitables : un nouveau défi
Beckers, Jacqueline ULg; Monville, Bertrand

Conference (2007, May)

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See detailLes représentations orthographiques et morphémiques activées lors de la reconnaissance des mots écrits chez les dyslexiques
Quemart, Pauline ULg; Janiot, Marion; Casalis, Séverine

Conference (2007, May)

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See detailStrontium ranelate decreases vertebral fracture risk whatever the level of pretreatment bone turnover markers
COLLETTE, Julien ULg; Reginster, Jean-Yves ULg; Bruyère, Olivier ULg et al

in Calcified Tissue International (2007, May), 80(Suppl.1), 29-30

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See detailThe MOBILE study long-term extension: progressive improvements in efficacy with oral ibandronate (1500mg) when administered monthly
Reginster, Jean-Yves ULg; Cooper, C.; Sedarati, F. et al

in Calcified Tissue International (2007, May), 80(Suppl.1), 144

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See detailInvestigating Depth-Fanout Trade-Off in WiMAX Mesh Networks
Nahle, Salim; Iannone, Luigi; Donnet, Benoît ULg et al

in 1st WEIRD Workshop on WiMAX, Wireless and Mobility (2007, May)

In the last years, Wireless Mesh Networks (WMNs) have been an emerging technology for providing cost/effective broadband Internet access. The research done insofar usually assumes that the wireless ... [more ▼]

In the last years, Wireless Mesh Networks (WMNs) have been an emerging technology for providing cost/effective broadband Internet access. The research done insofar usually assumes that the wireless backbone of a WMN is built using IEEE 802.11 technologies. Such an approach has the drawback of leading to dense and sub-optimal deployments, due to the short transmission range of this standard. Recently standardized, the WiMAX technology is supposed to transcend this limitation by a transmission range of several miles. In particular, the mesh mode of the WiMAX standard enables direct communications between subscriber stations and, hence, reduces dead zones while increasing the global throughput. In this paper, we investigate the throughput capacity of a WiMAX mesh tree. More specifically, we are interested in balancing the impact of the depth of the tree with its fanout. We provide a traffic model and evaluate the WiMAX mesh tree by simulations. [less ▲]

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See detailEffect of sample size on the mechanical stresses induced during the convective drying of highly shrinking materials
Léonard, Angélique ULg; Crine, Michel ULg; Jomaa, Wahbi

in Proceedings of the joint conference of AFSIA and Drying Working group of EFCE at Casino Municipal Biarritz, France, 24th and 25th May, 2007 (2007, May)

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See detailAbstract numeration systems
Charlier, Emilie ULg

Conference (2007, May)

In this talk, I will introduce abstract numeration systems in general and present some results I have regarding operation preserving regularity. In particular, I will focus on multiplication by a constant.

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See detailL'enchaînement des facteurs de défaillance de l'entreprise : une réconciliation des approches organisationnelles et financières
Crutzen, Nathalie ULg; Van Caillie, Didier ULg

Conference (2007, May)

The aim of this paper is to gather the findings from the multiple studies focused on the identification of failure paths, in order to propose an unifying model showing the chronological combination of the ... [more ▼]

The aim of this paper is to gather the findings from the multiple studies focused on the identification of failure paths, in order to propose an unifying model showing the chronological combination of the diverse factors leading a company to bankruptcy. An in-depth analysis of the existing literature and of its limitations leads to the elaboration of an original model presenting the different phases through which a company goes by in its evolution towards its juridical failure. Moreover this model emphasizes the fact that all companies do not follow the same paths before they disappear (Argenti, 1976). [less ▲]

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See detailThe TNF/ADAM 17 system: implication of an ADAM 17 haplotype in the clinical response to infliximab in Crohn's disease
Dideberg, Vinciane ULg; Theatre, Emilie ULg; Farnir, Frédéric ULg et al

in European Journal of Clinical Investigation (2007, May), 37(Suppl. 1), 79

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See detailDéveloppement de modèles pour la simulation des systèmes de chauffage, ventilation et conditionnement d'air
Andre, Philippe ULg; Lebrun, Jean ULg; Lemort, Vincent ULg et al

(2007, May)

Les outils de calculs actuellement disponibles permettent de simuler globalement à peu près n’importe quel système de chauffage ou de climatisation sur un pas de temps de l’ordre de l’heure ou moins et ce ... [more ▼]

Les outils de calculs actuellement disponibles permettent de simuler globalement à peu près n’importe quel système de chauffage ou de climatisation sur un pas de temps de l’ordre de l’heure ou moins et ce, sur une année complète ou plus. Encore faut-il que cette simulation fasse bien apparaître les termes dominants du bilan énergétiques et que les paramètres du système aient été correctement identifiés. Quelques principes généraux sont proposés ici et illustrés par des exemples. Deux cas sont envisagés : le chauffage d’une habitation et la climatisation d’un immeuble de bureaux. [less ▲]

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See detailEphemeral State Assisted Discovery of Peer-to-peer Networks
Martin, Sylvain ULg; Leduc, Guy ULg

in Boutaba, Raouf; Brunner, Marcus; Schmid, Stefan (Eds.) 1st IEEE Workshop on Autonomic Communications and Network Management (2007, May)

In the past few years there has been an impressive number of proposals for application-specific overlays or peerto-peer networks. However the procedure to bootstrap peers in those networks has remained an ... [more ▼]

In the past few years there has been an impressive number of proposals for application-specific overlays or peerto-peer networks. However the procedure to bootstrap peers in those networks has remained an under-researched topic, typically left as an implementation detail. In this paper, we first study the performance of history lists, a common decentralised bootstrap mechanism used in P2P applications. We then investigate how some lightweight network support, such as Ephemeral State, could help build a P2P application that would not depend on any centralised mechanism to discover other peers. [less ▲]

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See detailValorisation in bread of dietary fibres from by-products of the agro-industries.
Roiseux, Olivier; Sindic, Marianne ULg; Vanderbeke, E. et al

Poster (2007, May)

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See detailDelivery Guarantees In Predictable Disruption Tolerant Networks
François, Jean-Marc; Leduc, Guy ULg

in Lecture Notes in Computer Science (2007, May), 4479

This article studies disruption tolerant networks (DTNs) where each node knows the probabilistic distribution of contacts with other nodes. It proposes a framework that allows one to formalize the ... [more ▼]

This article studies disruption tolerant networks (DTNs) where each node knows the probabilistic distribution of contacts with other nodes. It proposes a framework that allows one to formalize the behaviour of such a network. It generalizes extreme cases that have been studied before where either (a) nodes only know their contact frequency with each other or (b) they have a perfect knowledge of who meets who and when. This paper then gives an example of how this framework can be used; it shows how one can find a packet forwarding algorithm optimized to meet the delay/bandwidth consumption trade-off: packets are duplicated so as to (statistically) guarantee a given delay or delivery probability, but not too much so as to reduce the bandwidth, energy, and memory consumption. [less ▲]

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See detailExploring the risk factors for Salmonella in the ten biggest Belgian pig slaughterhouses.
Delhalle, Laurent ULg; Desadeleer, L.; Bollaerts, K. et al

Poster (2007, May)

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See detail3D image analysis of electron tomograms of clay/rubber nanocomposites
Gommes, Cédric ULg; Bons, A-J; BLACHER, Silvia ULg

Conference (2007, May)

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See detailAdaptive Aeroelastic Structures for Improved Aircraft Performance
Cooper, J. E.; Hodigere-Siddaramaiah, V.; Vio, G. A. et al

in Spencer Jr; Tomizuka, M.; Yun, C. B. (Eds.) et al World Forum on Smart Materials and Smart Structures Technology (2007, May)

There is a growing interest in the development of adaptive aeroelastic structures to allow aeroelastic deflections to be used in a beneficial manner. Part of the 3AS research programme was devoted towards ... [more ▼]

There is a growing interest in the development of adaptive aeroelastic structures to allow aeroelastic deflections to be used in a beneficial manner. Part of the 3AS research programme was devoted towards investigating the use of changes in the internal aerospace structure in order to control the static aeroelastic behaviour. Such an approach is desirable and arguably advantageous compared to other possible concepts. [less ▲]

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See detailA Sensor-Fault-Tolerant Diagnosis Tool Based on a Quadratic Programming Approach
Borguet, Sébastien ULg; Léonard, Olivier ULg

in Proceedings of the ASME Turbo Expo 2007 (2007, May)

Kalman filters are widely used in the turbine engine community for health monitoring purpose. This algorithm gives a good estimate of the engine condition provided that the discrepancies between the model ... [more ▼]

Kalman filters are widely used in the turbine engine community for health monitoring purpose. This algorithm gives a good estimate of the engine condition provided that the discrepancies between the model prediction and the measurements are zeromean, white random variables. However, this assumption is not verified when instrumentation (sensor) faults occur. As a result, the identified health parameters tend to diverge from their actual values which strongly deteriorates the diagnosis. The purpose of this contribution is to blend robustness against sensor faults into a tool for performance monitoring of jet engines. To this end, a robust estimation approach is considered and a Sensor Fault Detection and Isolation module is derived. It relies on a quadratic program to estimate the sensor faults and is integrated easily with the original diagnosis tool. The improvements brought by this robust estimation approach are highlighted through a series of typical test-cases that may be encountered on current turbine engines. [less ▲]

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See detailOn Inverse Problems in Turbine Engine Parameter Estimation
Henriksson, Mattias; Borguet, Sébastien ULg; Léonard, Olivier ULg et al

in Proceedings of the ASME Turbo Expo 2007 (2007, May)

This paper extends previous work on model order reduction based on singular value decomposition. It is shown how the decrease in estimator variance must be balanced against the bias on the estimate ... [more ▼]

This paper extends previous work on model order reduction based on singular value decomposition. It is shown how the decrease in estimator variance must be balanced against the bias on the estimate inevitably introduced by solving the inverse problem in a reduced order space. A proof for the decrease in estimator variance by means of multi-point analysis is provided. The proof relies on comparing the Cramer-Rao lower bound of the single point and the multi-point estimators. Model order selection is discussed in the presence of a varying degree of a priori parameter information, through the use of a regularization parameter. Simulation results on the SR-30 turbojet engine indicate that the theoretically attainable multi-point improvements are difficult to realize in practical jet engine applications. [less ▲]

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See detailLa prescription extinctive en droit du travail
Kefer, Fabienne ULg; Clesse, Jacques ULg

in La prescription (2007, May)

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See detailRow by row simulation of heat recovery steam generators : comparing different types of initialization as well as the LMTD and ε-NTU simulation method
Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

Conference (2007, May)

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness ... [more ▼]

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness-number of transfer unit. These approaches are compared in term of results and speed of calculation. We also present the difficulties encountered and some means of circumventing them. Some cases of superheater are treated in order to illustrate our matter. [less ▲]

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See detailMétacognition et apprentissage par le jeu : comment recueillir des indices et fournir des feedback métacognitifs quantitatifs sans perdre la jouabilité ?
Castaigne, Jean-Loup ULg

in Actes du 24e colloque international de l'association internationale de prédagogie universitaire (AIPU) : Vers un changement de culture en enseignement supérieur : Regards sur l'innovation, la collaboration et la valorisation (2007, May)

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See detailCharacterization of gels via solvent desorption measurements
Gommes, Cédric ULg; Noville, Francis; Pirard, Jean-Paul ULg

Poster (2007, May)

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See detailRestructuring and territorial governance: the contribution of actor-network theory
Antoine, Mélanie ULg; Dalon, Gelica

Conference (2007, May)

The aim of this paper is to shed light, in an exploratory manner, on the role of the choices made in terms of governance in reorganisation projects initiated on territories affected by companies ... [more ▼]

The aim of this paper is to shed light, in an exploratory manner, on the role of the choices made in terms of governance in reorganisation projects initiated on territories affected by companies' restructuring. Actor-network theory is used to analyse the dynamics present on three territories concerned by the restructuring of a same company. It allows to identify the strengths and weaknesses of the territorial reorganisation's modes of management and to highlight their decisive influence on the evolution of the projects. [less ▲]

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See detailSuccess and failure factors for stress management interventions: Survey of Belgian companies
Barbier, Marie ULg; Peters, Stéphanie ULg; Hansez, Isabelle ULg

Conference (2007, May)

Stress at work has become a major problematic in Europe this last decade. Several methods for diagnosis and intervention can be listed. In this context, an examination of interventions taking place in ... [more ▼]

Stress at work has become a major problematic in Europe this last decade. Several methods for diagnosis and intervention can be listed. In this context, an examination of interventions taking place in companies is necessary: what are the reasons for implementing stress prevention programmes (SPP)? Which ones are the most frequent? What are the success and failure factors for implementing SPP? In order to answer those questions, a large scale survey was implemented in Belgian companies (N=210). Results show that a) companies mainly use diagnosis to fulfil legal obligation, b) psychosocial risk assessments are less implemented in small companies (less than 50 workers), c) interventions are rarely systematically evaluated, d) most interventions target work environment, and specifically organisational (rather than ergonomic) outcomes, and e) communication/participation and methodological outcomes facilitate implementation of intervention, whereas changes and time/finances outcomes are blocking factors. To conclude, we can say that our survey emphasizes the relevance of public-awareness campaign (particularly towards small companies) about the necessity of implementing stress prevention program and of proceeding to systematic evaluation of such program. Public-awareness campaign is also needed concerning the impact of facilitating outcomes such as communication, participation and methodology, and of blocking outcomes such as organizational changes, time constraints and costs. Theoretically speaking, our study stresses first the prevalence of work-related interventions that are organisational rather than ergonomic or individual. Another point rather new regarding the existing literature is the blocking aspect of organizational changes. [less ▲]

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See detailStrontium ranelate demonstrates vertebral and non-vertebral antifracture efficacy including hip fractures over 5 years in postmenopausal osteoporotic women
Reginster, Jean-Yves ULg; Brixen, Kim; Cormier, C. et al

in Calcified Tissue International (2007, May), 80(Suppl.1), 47

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See detailDaily quality control of activimeters: an absolute usefulness.
Seret, Alain ULg; Greffe, J.-L.

Poster (2007, May)

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See detailTopology Optimization of Structural Components Included in Flexible Multibody Systems
Bruls, Olivier ULg; Lemaire, Etienne ULg; Eberhard, Peter et al

in Proceedings of the 7th World Congress on Structural and Multidisciplinary Optimization (2007, May)

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. Generally, topology optimization techniques consider that the structural ... [more ▼]

This work addresses the topology optimization of structural components embedded in multibody systems with large amplitude motions. Generally, topology optimization techniques consider that the structural component is isolated from the rest of the mechanism and use simplified quasi-sta tic load cases to mimic the complex loadings in service. In contrast, this paper proposes an optimization procedure based on the dynamic simulation of the full multibody system with large amplitude motions and elastic deflections. We show that the simulation model, which involves a nonlinear finite element formulation, a time integration scheme and a sensitivity analysis, can be efficiently exploited in an optimization loop. The method is applied to truss structural components. Each truss is represented by a structural universe of beams with a topology design variable attached to each one. A SIMP model (or a variant of the power law) is used to penalize intermediate densities. The optimization formulation is stated as the minimization of the mean compliance over a time period or as the minimization of the mean tip deflection during a given trajectory, subject to a volume constraint. In order to illustrate the benefits of the integrated design approach, the case of a two degrees-of-freedom robot arm is developed. [less ▲]

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See detailAP and MN-centric Mobility Prediction: A Comparative Study Based On Wireless Traces
François, Jean-Marc; Leduc, Guy ULg

in Lecture Notes in Computer Science (2007, May), 4479

The mobility prediction problem is defined as guessing a mobile node's next access point as it moves through a wireless network. Those predictions help take proactive measures in order to guarantee a ... [more ▼]

The mobility prediction problem is defined as guessing a mobile node's next access point as it moves through a wireless network. Those predictions help take proactive measures in order to guarantee a given quality of service. Prediction agents can be divided into two main categories: agents related to a specific terminal (responsible for anticipating its own movements) and those related to an access point (which predict the next access point of all the mobiles connected through it). This paper aims at comparing those two schemes using real traces of a large WiFi network. Several observations are made, such as the difficulties encountered to get a reliable trace of mobiles motion, the unexpectedly small difference between both methods in terms of accuracy, and the inadequacy of commonly admitted hypotheses (such as the different motion behaviours between the week-end and the rest of the week). [less ▲]

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See detailResolution recovery iterative reconstruction for human pinhole SPECT: a phantom study.
Seret, Alain ULg; Defrise, Michel; Andreyev, André et al

Poster (2007, May)

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See detailLe Label Social du gouvernement belge : Quel apport pour le développement social ?
El Abboubi, Manal; Crutzen, Nathalie ULg

in Actes de la 9ème Université de printemps de l'audit social (2007, May)

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See detailfMRI study of hypnosis-induced analgesia
Boly, Mélanie ULg; Balteau, Evelyne ULg; Schnakers, Caroline ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 38-39

Detailed reference viewed: 6 (3 ULg)
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See detailConception et synthèse d’outils pharmacologiques originaux pour l’étude des récepteurs au thromboxane
Moray, A. L.; Dogne, J. M.; Neven, P. et al

Poster (2007, May)

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See detailQuel usage d’un site Web dans le soutien de la pérennisation d’un réseau d’enseignants de l’enseignement supérieur intéressés par les TICE : Form@HETICE.
Fontaine, Perrine ULg; Denis, Brigitte ULg

in Actes du 24e colloque de l’Association Internationale de Pédagogie Universitaire : Vers un changement de culture en enseignement supérieur. Regards sur l'innovation, la collaboration et la valorisation (2007, May)

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See detailHigh-order sigma-delta interfaces for capacitive MEMS sensors
Kraft, Michaël ULg; Dong, Yufeng

in Proceedings Sensor Conference 2007 (2007, May)

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See detailGossypiboma at PET-CT.
MEDART, L.; WITHOFS, Nadia ULg; HUSTINX, Roland ULg et al

in PROCEEDINGS OF XIIIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2007, May)

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See detailSeismic ground motion estimation in Alpine valleys (Valais, Switzerland): modelling and response spectra
Alvarez-Rubio, Sonya; Havenith, Hans-Balder ULg; Fäh, Donat

Conference (2007, May)

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See detailAnother etiology for inflammatory syndrome of unknown origin.
MEDART, L.; WITHOFS, Nadia ULg; HUSTINX, Roland ULg et al

in PROCEEDINGS OF XIIIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2007, May)

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See detailEffect of dementia severity and age on posterior cingulate cortex metabolism in Alzheimer's disease
Withofs, Nadia ULg; Salmon, Eric ULg; Hallet, Claude ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 146

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See detailVoxel-based analysis of posterior cingulated cortex metabolism in Alzheimer’s disease : effect of dementia severity and age.
WITHOFS, Nadia ULg; SALMON, Eric ULg; LAUREYS, Steven ULg et al

in PROCEEDINGS OF XIIIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2007, May)

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See detailThird Millennium Pottery from Terqa : Preliminary Results
Mas, Juliette ULg

Conference (2007, May)

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See detailActive brain processes during human quiescent sleep: an EEG/fMRI study of non-REM slow oscillations
Dang-Vu, T.; Schabus, M.; Desseilles, Martin ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 50

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See detailGlobal strategy for the development of estrogenic compounds detection screening test
Collodoro, Mike ULg; Makasinga, Elu; Lemaire, Pascale ULg et al

Poster (2007, May)

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See detailCerebral resting state fluctuations predict somatosensory perception
Boly, Mélanie ULg; Balteau, Evelyne ULg; Schnakers, Caroline ULg et al

in Journal of Neurology (2007, May), 254(Suppl. 3), 42

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See detailPlurilinguisme et enseignement des langues
Defays, Jean-Marc ULg

Conference (2007, May)

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See detailEndogenous mode of competition in general equilibrium
Tharakan, Joseph ULg

Conference (2007, May)

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See detailFDG PET/CT for diagnostic arterial prosthetic graft infection : preliminary report.
NAMUR, Gauthier ULg; VAN DAMME, Hendrik ULg; BECKERS, Catherine ULg et al

in PROCEEDINGS OF XIIIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2007, May)

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See detailPET/CT imaging of skull base meningiomas using 1-18F-fluoro-L-tyrosine; initial report.
RUTTEN, I.; CABAY, Jean-Evrard ULg; WITHOFS, Nadia ULg et al

in PROCEEDINGS OF XIIIth SYMPOSIUM OF THE BELGIAN SOCIETY OF NUCLEAR MEDICINE (2007, May)

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See detailTetanus in the horse
Van Galen, Gaby ULg; Amory, Hélène ULg

Conference (2007, April 28)

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See detailEnglish and French Canadians, Flemish and Francophone Belgians. The Linguistic Composition of the Canadian and Belgian Federal Cabinet
Reuchamps, Min ULg

Conference (2007, April 27)

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of ... [more ▼]

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of Daniel Elazar’s seminal work on federalism in plural societies and of Arend Lijphart’s on consociationalism offers a theoretical framework which can be usefully applied to study the distribution of power between the two main ethno-linguistic communities at the highest level of the state. Using the existing “model of points” and the author’s own “model of the weight of ministerial portfolios”, this paper explores the linguistic composition of the federal governments in both countries over the last thirty years (1970-2006). Whereas the Belgian Constitution has required since 1970 that the federal cabinet be staffed by an equal number of Flemish and Francophone ministers, the Canadian Constitution does not require such a linguistic parity and therefore leaves a greater freedom for the composition of the government. On this background, two logics may explain the linguistic composition in the two cases: a logic of transaction between the two main communities and a logic of representation. The paper opens, on the one hand, with the elaboration of the theoretical framework combining the works of Elazar and Lijphart and, on the other hand, with the construction of the two models. The framework and the models are applied to each case, emphasizing the logic of transaction and the logic of representation. On the basis of this examination, this paper concludes by suggesting that Flemish and Francophone Belgians as well and English and French Canadians benefit from the composition of the federal cabinet. The conclusion opens—new—ways and means to hinder political tensions in plural societies through the institutional arrangement. [less ▲]

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See detailPhotodetachment and Photodissociation Mass Spectrometry of Biomolecule Ions
Gabelica, Valérie ULg

Conference (2007, April 27)

We recently explored the effects of irradiating DNA polyanions stored in a quadrupole ion trap (QIT) mass spectrometer with an optical parametric oscillator (OPO) laser between 250 nm and 285 nm. We ... [more ▼]

We recently explored the effects of irradiating DNA polyanions stored in a quadrupole ion trap (QIT) mass spectrometer with an optical parametric oscillator (OPO) laser between 250 nm and 285 nm. We studied DNA 6-mer to 20-mer single strands, and 12-base pair double strands. In all cases, laser irradiation causes electron detachment from the multiply charged DNA anions. Electron photo-detachment efficiency directly depends on the number of guanines in the strand, and maximum efficiency is observed between 260 and 275 nm. Collisional activation of the radical anions results in extensive fragmentation, which can be used to sequence the DNA strands. It has therefore important potential applications in analytical chemistry. We also obtained preliminary results on laser irradiation of DNA coupled to other chromophores (covalently bound or noncovalently bound). Depending on the chromophore, three different behaviors are encountered: (1) the photon energy can be redistributed in the molecule by internal conversion, (2) electron photodetachment was observed for a few chromophores, and (3) specific photodissociation was observed for a porphyrin chromophore. Here we will address the question of the mechanism of electron photodetachment. DNA multiply charged anions undergo one-photon electron ejection (oxidation) when subjected to laser irradiation at 260 nm (4.77 eV). Electron photodetachment is likely a fast process, given that photodetachment is able to compete with internal conversion and/or radiative relaxation to the ground state. The DNA [6-mer]3- ions studied here show a marked sequence-dependence of electron photodetachment yield. Remarkably, the photodetachment yield (dG6 > dA6 > dC6 > dT6) is inversely correlated with the base ionization potentials (G < A < C < T). Sequences with guanine runs show increased photodetachment yield as the number of guanine increases, in line with the fact that positive holes are the most stable in guanine runs. This correlation between photodetachment yield and the stability of the base radical may be explained by tunneling of the electron through the repulsive Coulomb barrier. The wavelength-dependence of electron detachment yield was studied for dG63-. Maximum electron photodetachment is observed in the wavelength range corresponding to base absorption (260-270 nm). This demonstrates the feasibility of gas-phase UV spectroscopy on large DNA anions. The calculations and the wavelength dependence suggest that the electron photodetachment is initiated at the bases and not at the phosphates. This also indicates that, although direct photodetachment could also occur, autodetachment from excited states, presumably corresponding to base excitation, is the dominant process at 260 nm. Excited states dynamics of large DNA strands still remains largely unexplored, and photo-oxidation studies on trapped DNA multiply charged anions can help bridging the gap between gas-phase studies on isolated bases or base pairs and solution-phase studies on full DNA strands. Time-resolved measurements on photodetachment and photodissociation can be used to contribute elucidating the mechanisms at stake in these novel experiments. [less ▲]

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See detailLa place du corps dans les théories de la réception littéraire
Vandeninden, Elise ULg

Conference (2007, April 26)

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See detailWheat starch variability in characteristics and rheological properties: the influence of varieties, harvest years and phytotechnique
Sinnaeve, Georges; Paridaens, A. M.; Massaux, Carine et al

Conference (2007, April 25)

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See detailEtude longitudinale d’essais multilocaux : apports du modèle mixte
Brostaux, Yves ULg

Conference (2007, April 25)

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See detailRückblenden - Junge deutsche Autoren erzählen Geschichte.
Viehöver, Vera ULg

Conference (2007, April 25)

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See detailA mixed-integer heuristic for the structural optimization of a cruise ship
Bay, Maud ULg; Crama, Yves ULg; Richir, Thomas et al

in COMPIT 2007 , Cortona, Italy (2007, April 23)

A heuristic approach is proposed to solve the structural optimization problem of a cruise ship. The challenge of optimization is to define the scantling of the structure of a ship in order to minimize the ... [more ▼]

A heuristic approach is proposed to solve the structural optimization problem of a cruise ship. The challenge of optimization is to define the scantling of the structure of a ship in order to minimize the weight or the production cost. The variables are the dimensions and positions of the constitutive elements of the structure: they are discrete by nature. The objective functions are nonlinear functions. The structure is submitted to geometric constraints and to structural constraints. The geometric constraints are linear functions and the structural constraints are implicit functions requiring a high computation cost. The problem belongs to the class of mixed-integer nonlinear problems (MINLP). A local heuristic of the type “dive and fix” is combined with a solver based on approximation methods. The solver is used as a black-box tool to perform the structural analysis and solve the nonlinear optimization problems (NLP) defined by the heuristic. The heuristic is designed to always provide a discrete feasible solution. Experiments on a real-size structure demonstrate that the optimal value of the mixed-integer problem is of the same magnitude as the optimal value of the optimization problem for which all the variables can take continuous values. [less ▲]

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See detailNaturally occurring BLV- LTR variants show differential binding with transcriptional regulator E2F-4
Rodriguez, Sabrina ULg; Varone, C.; Cánepa, E. et al

in AIDS Research and Human Retroviruses (2007, April 23), 23(4), 657

Naturally occurring BLV- LTR variants show differential binding with transcriptional regulator E2F-4. Sabrina M. Rodríguez1, Cecilia Varone2, Eduardo Cánepa2, Karina Trono1. srodriguez@cnia.inta.gov.ar ... [more ▼]

Naturally occurring BLV- LTR variants show differential binding with transcriptional regulator E2F-4. Sabrina M. Rodríguez1, Cecilia Varone2, Eduardo Cánepa2, Karina Trono1. srodriguez@cnia.inta.gov.ar 1Instituto de Virología. CICVyA. INTA-Castelar. Castelar. Buenos Aires. Argentina 2Catedra de Biología Molecular. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Buenos Aires. Argentina The proviral Long Terminal Repeats (LTR) of retroviruses constitute a critical element involved in the regulation of viral and cellular gene expression. It is well known for some viruses within the Retroviridae family that minimal changes in this region can influence tropism, virulence and pathogenicity. The aim of this work was to elucidate if there is any association between the binding capacity of the Bovine Leukemia Virus (BLV) LTR region with cellular transcription factors and the pathogenic evolution of natural infection. The complete 5´LTR sequence amplified from mononuclear cells and tumour tissues of 40 naturally infected cattle was analyzed. Sequence analysis revealed the presence of two LTR variants associated with the different BLV pathogenic phenotypes: aleukemic (AL), persistent lymphocitosis (PL) and lymphosarcoma (LS). Analysis by EMSA showed a clearly weaker specific binding pattern when a LS-derived sequence was used as probe. Together with this finding, we also demonstrated by gel shift and supershift assays that the cellular transcription factor E2F-4 specifically interacts with a putative E2F binding motif within the U5 region of BLV 5`LTR unveiled by “in sillico” analysis. The results of this work demonstrates for the first time the presence of differential binding capacity of BLV natural derived variants to cellular nuclear proteins, together with physical characterization of an E2F-4 binding site in the U5 region of BLV-LTR that shows preferential binding to AL/PL derived sequences. These findings can contribute to the knowledge of LTR-driven regulation of viral and cellular gene expression. [less ▲]

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See detailDetection of BLV in frozen semen samples by PCR assay
Dus Santos, M.J.; Rodriguez, Sabrina ULg; Wigdorovitz, A. et al

in AIDS Research and Human Retroviruses (2007, April 23), 23(4), 651

Detection of BLV in frozen semen samples by PCR assay Dus Santos Maria Jose; Rodriguez Sabrina; Wigdorovitz Andrés; Trono Karina Instituto de Virología, CICVyA, INTA-Castelar. CC 77. Buenos Aires ... [more ▼]

Detection of BLV in frozen semen samples by PCR assay Dus Santos Maria Jose; Rodriguez Sabrina; Wigdorovitz Andrés; Trono Karina Instituto de Virología, CICVyA, INTA-Castelar. CC 77. Buenos Aires, Argentina. Detection of BLV in frozen semen samples by PCR assay María José Dus Santos, Sabrina Rodriguez, Andrés Wigdorovitz and Karina Trono. Instituto de Virología, CICVyA, INTA-Castelar. CC 77. Buenos Aires, Argentina mdussantos@cnia.inta.gov.ar The sanitary and economic impact of BLV infection is associated with the interference in the international movement of cattle and their germ plasm. Although experimental data support the improbability that semen from BLV-positive bulls could infect recipient cows, restriction for commercialization of semen from infected animals is still present. The objective of this work was to standardize a PCR assay to diagnose the presence of BLV genome and to describe the pattern of BLV detection in frozen semen samples. The developed methodology involves the amplification of an internal fragment of gag gene and posses a limit of detection of 60 viral particles. Additionally, a biological test in susceptible sheep was performed in order to evaluate the transmission of BLV genome by semen from seropositive animals. This data strongly suggest that semen from seropositive bulls that resulted negative by PCR can be used for artificial insemination (AI), accompanied by proper collection protocols. Frozen semen samples from 30 seropositive bulls were analyzed. It was possible to detect proviral DNA in 118 out of 545 samples. It was important to note that BLV genome detection occurred in several collections but in an alternated way with non detection periods. On the other hand, in 4 seropositive bulls, it was not possible to detect BLV genome in all the samples analyzed. The development of this PCR assay constitutes a valuable diagnostic tool to determine the BLV-free status of semen used for AI. Moreover, the results suggest that BLV could present an intermittent pattern of excretion. [less ▲]

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See detailVirulence genetic markers in the LTR of naturally occurring variants of Bovine Leukemia Virus from Argentina
Rodriguez, Sabrina ULg; Trono, K.; Jones, L.R.

in AIDS Research and Human Retroviruses (2007, April 23), 23(4), 656

Virulence Genetic Markers in the LTR of Naturally Occurring Variants of Bovine Leukemia Virus from Argentina *Sabrina M Rodríguez1 Karina G Trono1 Leandro R Jones1 1Instituto de Virología, CICVyA, INTA ... [more ▼]

Virulence Genetic Markers in the LTR of Naturally Occurring Variants of Bovine Leukemia Virus from Argentina *Sabrina M Rodríguez1 Karina G Trono1 Leandro R Jones1 1Instituto de Virología, CICVyA, INTA-Castelar, Castelar, Buenos Aires, Argentina *Corresponding author, Sabrina Rodríguez, E-mail: srodriguez@cnia.inta.gov.ar Bovine leukemia virus (BLV), the causative agent of enzootic bovine leukosis, is classified within the Deltaretrovirus genus. The outcome of infection is diverse. Almost 70% of the infected animals are asymptomatic (AL), while 25% develop a benign condition called persistent lymphocytosis (PL). In addition, between 1 and 5% of the infected cattle develop a B-lymphoproliferative neoplastic condition or lymphosarcoma (LS). The genetic basis of these various clinical manifestations is unknown. Long terminal repeats (LTR) are implicated in the regulation of viral and cellular gene expression. It is well documented for other retroviruses that even single point mutations in the nucleotidic sequence of the LTR can have a direct impact on tissue tropism, virulence, and pathogenicity. However, the influence of genetic variation in LTRs on clinical aspects has never been studied for BLV. In order to study the association between LTR genetic variations and the clinical presentation of BLV infection, sequencing of the complete 5 -LTR region from 28 naturally BLV-infected cattle was carried out. The relation of genetic variations to clinical evolution was analyzed for each variant position using comparative methods as implemented in Pagel’s correlation test of the Mesquite program. These analyses showed that two out of seven variant positions were highly correlated with pathogenesis (p value less than 10E-18). The results reported herein suggest an important role for certain positions of the LTR in the determination of the clinical evolution of BLV-infected cattle. These findings could contribute to gaining insight into the molecular grounds of BLV viral pathogenesis in cattle. [less ▲]

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See detailModeling the influence of the Greenland ice sheet melting on the Atlantic meridional overturning circulation during the next millennia
Fichefet, Thierry; Driesschaert, Emmanuelle; Goosse, Hugues et al

Conference (2007, April 19)

A three-dimensional Earth system model of intermediate complexity including a dynamic ice sheet component has been used to investigate the long-term evolution of the Greenland ice sheet and its effects on ... [more ▼]

A three-dimensional Earth system model of intermediate complexity including a dynamic ice sheet component has been used to investigate the long-term evolution of the Greenland ice sheet and its effects on the Atlantic meridional overturning circulation (AMOC) in response to a range of stabilized anthropogenic forcings. Our results suggest that the Greenland ice sheet volume should experience a significant decrease in the future. For a radiative forcing exceeding 7.5 W m-2, the modeled ice sheet melts away within 3000 years. A number of feedbacks operate during this deglaciation, implying a strong non-linear relationship between the radiative forcing and the melting rate. In the most extreme scenario considered, the freshwater flux from Greenland into the surrounding oceans is higher than 0.1 Sv during a few centuries. This is however insufficient to induce a shutdown of the AMOC in the model. [less ▲]

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See detailSynthèse et clôture du séminaire
Halleux, Jean-Marie ULg

Conference (2007, April 19)

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See detailExemple d'étude hydrogéologique d'un système rivière-aquifère: Flémalle test site
Batlle-Aguilar, Jordi; Brouyère, Serge ULg

Conference (2007, April 18)

Cette présentation des investigations menées pour quantifier les échanges nappe - rivière au droit d'une friche industrielle fortement contaminée

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See detailL'image comme parole. Photographie et chronqiue de soi sur la toile
Havelange, Carl ULg

Conference (2007, April 18)

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