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See detailGovernment Debt Denomination Policies Before and After the EMU Advent
Hübner, Georges ULg; Joliet, Robert

in Open Economies Review (2013), 24

Through a cost-minimizing approach, this paper derives joint indicators to assess the efficiency of the mix of sovereign debt currencies between the countries belonging to the European Monetary Union (EMU ... [more ▼]

Through a cost-minimizing approach, this paper derives joint indicators to assess the efficiency of the mix of sovereign debt currencies between the countries belonging to the European Monetary Union (EMU). This theoretical insight enables us to explain why and how the introduction of the euro and the adoption of a common monetary policy may have led to significant changes in debt structure among EMU members, notably in favor of further euro-denominated debt. The interplay of intrinsic and strategic variables yields stylized facts that are consistent with country-specific empirical evidence. Following the sovereign debt crisis, we further emphasize the value-added of a coordinated debt issuance policy among EMU countries. [less ▲]

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See detailGP’s engagement in detecting and managing abuse of alcohol, illegal drugs, hypnotics and tranquilizers in the Belgian adult population
Ketterer, Frédéric ULg; Lambrechts, Marie-Claire; Symons, Linda et al

in European Journal of General Practice (2013, September), 19(3), 162-184

Background General practitioners (GPs) Occupational physicians (OPs) can play an important role in detecting and managing substance abuse in the working population. The UP TO DATE project aims at ... [more ▼]

Background General practitioners (GPs) Occupational physicians (OPs) can play an important role in detecting and managing substance abuse in the working population. The UP TO DATE project aims at identifying the difficulties these professionals encounter in this area, and to explore ways of collaboration in providing appropriate care. Research question What are the experiences, attitudes and decision making of GPs and OPs regarding to alcohol, illegal drugs, hypnotics and tranquilizers abuse from a physician’s perspective? Method In this qualitative study, with a phenomenological perspective, 20 GPs and 16 OPs, experienced with substance abuse in daily practice, got a face to face in-depth interview. (October until December 2012). Along with the data collection process the analysis started with a constant comparison between the data and the chosen integrated model of change (De Vries), using coding techniques of grounded theory. Results GPs meet important barriers to detect misuse of all substances. To address this issue and the patient’s motivation for change, the doctor-patient relationship is crucial. The risk to disturb the relationship, and loose the patient’s trust, is a major concern. An attitude of patient-centeredness, collaboration and empowerment of the patient is needed to make any progress, to get results and to overcome as a GP the burden of those demanding encounters. Self-care is an important concern. Collaboration with specialised health providers confronted GPs with various problems: not enough services, long waiting lists, unclear methods and criteria. GPs lack an insight in the OP’s role, and experience problems to contact them. Whether the OP is a trustful health advocate for their patient is a major concern. Some OPs are perceived too linked to the employer, raising legitimate concerns about professional confidentiality. Conclusion These are preliminary results. At the conference, a comprehensive overview on the qualitative analysis will be given. [less ▲]

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See detailGPR detection of saturated areas into concrete in the presence of a water gradient
Louis, Arnaud ULg; Van der Wielen, Audrey ULg; Courard, Luc ULg et al

in 2012 14th International Conference on Ground Penetrating Radar (GPR) (2012, June)

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection ... [more ▼]

In the concrete, saturated areas are most of the time limited by a transition zone, presenting a water gradient. This transition zone can affect the GPR wave’s reflection and decrease the reflection coefficient by comparison to the coefficient that would be obtained on a sharp interface. To quantify the impact of the water gradient on the reflection coefficient, we performed finite differences simulations. They showed that the reflection coefficient was reduced by 70% if the thickness of the transition zone was larger than 2/5 of the wavelength. Laboratory experiments, using hygrometric sensors for the water content control, confirmed this trend. [less ▲]

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See detailGPR Limits for Thin Layers in Concrete Detection: Numerical and Experimental Evaluation
Van der Wielen, Audrey ULg; Courard, Luc ULg; Nguyen, Frédéric ULg

in Progress In Electromagnetics Research Symposium Proceedings, Marrakesh, Morocco, March 20-23, 2011 (2011, March)

The Ground Penetrating Radar (GPR) is a nondestructive technique increasingly used in civil structures inspection. In those structures, thin layers, presenting a relatively small thickness compared to ... [more ▼]

The Ground Penetrating Radar (GPR) is a nondestructive technique increasingly used in civil structures inspection. In those structures, thin layers, presenting a relatively small thickness compared to their area, are common and induce a complex multiple reflection scheme of the GPR waves on the two interfaces limiting the layer. The theoretical relationships predicting the reflected amplitude are based on multiple simplifying assumptions that are not matched by most commercial GPR impulse machines. In the first part of this study, we confronted the theoretical curves with numerical finite difference simulations performed with GprMax2D, with both a continuous sine wave and a realistic pulse derived from measurements. In the second part, we performed experiments on two concrete slabs, separated with an air space of variable thickness. The measured amplitude appeared to be different from the predictions, probably due to surface noise. [less ▲]

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See detailGPS : A tool to study the Earth Atmosphere
Warnant, René ULg

Conference given outside the academic context (2002)

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See detailGPS activities at the Royal Observatory of Belgium
Bruyninx, Carine; Warnant, René ULg; Pâquet, Paul

in Veröffentlichungen der Bayerischen Kommission für die Internationale Erdmessung, Astronomisch - Geodätische Arbeiten, Heft 52 (1992)

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See detailA GPS based prototype service for monitoring the ionospheric irregularities and scintillations at a global scale
Valette, J.-J.; Yaya, P.; Prévost, P.-L. et al

Conference (2005)

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See detailLe GPS et la Physique
Garnir, Henri-Pierre ULg; Strivay, David ULg; Bastin, Thierry ULg

in Science and Culture (2002), 380

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See detailGPS et topographie : erreurs, précision et perspectives futures
Wautelet, Gilles ULg

Conference given outside the academic context (2013)

En topographie moderne, le système GPS (Global Positioning System) permet de mesurer sa position en temps réel avec une précision centimétrique. Ce niveau de précision est atteint grâce à l'utilisation de ... [more ▼]

En topographie moderne, le système GPS (Global Positioning System) permet de mesurer sa position en temps réel avec une précision centimétrique. Ce niveau de précision est atteint grâce à l'utilisation de la technique appelée Real-Time Kinematics (RTK), qui se base sur un réseau de stations permanentes. La précision de la position calculée par RTK varie avec les conditions géométriques de la constellation GPS et dépend également de différentes sources d'erreurs, comme l'effet de l'atmosphère terrestre. Après un bref rappel théorique sur le fonctionnement du GPS, ces différentes sources d'erreur sont présentées, ainsi que leur impact sur le positionnement RTK. Enfin, l'avenir du RTK est évoqué avec, notamment, l'apport de la future constellation européenne Galileo. [less ▲]

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See detailThe GPS Observation Campaigns on the Mt. Etna Volcano from 1992 to 1994
Bruyninx, Carine; Warnant, René ULg

Report (1994)

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See detailGPS TEC and ITEC from digisonde data compared with NEQUICK model
Jodogne, Jean-Claude; Nebdi, Hamid; Warnant, René ULg

in Advances in Radio Science (2004), 2

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See detailGPs working in solo practice : obstacles and motivations for working in a group ? A qualitative study
Feron, Jean-Marc; Cerexhe, F.; Pestiaux, Dominique et al

in BMC Family Practice (2003), 20(2), 167-172

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See detailGPS, superconducting and absolute gravimeter measurements to evaluate crustal deformation in Membach, Belgium
Van Camp, Michel; Warnant, René ULg; Francis, Olivier et al

Conference (2002)

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See detailLe GPS, un système à tout faire ?
Warnant, René ULg

Conference given outside the academic context (2002)

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See detailA GPS/GNSS dense network used to monitor ionospheric positioning error
Wautelet, Gilles ULg; Lejeune, Sandrine; Warnant, René ULg

Poster (2010, December)

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See detailGPS™ II and GPS™ III: comparison of obtained platelets concentrations
Kaux, Jean-François ULg; Le Goff, Caroline ULg; Renouf, Julien et al

Poster (2010, March 20)

Introduction: Recently, several researches, essentially in vitro, demonstrated the positive effects of platelets on healing process of different tissues: bones, muscles and tendons. The aim of this study ... [more ▼]

Introduction: Recently, several researches, essentially in vitro, demonstrated the positive effects of platelets on healing process of different tissues: bones, muscles and tendons. The aim of this study is to compare the obtained platelets concentration between the new GPS™ III and GPS™ II. Methods: Two blood samples of 52 mL were taken in 5 volunteers and transferred respectively in both GPS™ II and GPS™ III. These devices were centrifuged at 3200 RPM during 15 min. The platelet-rich plasma (PRP) was thus collected and transferred in 6 mL test tubes. Cells count was done using an analyser ABX Micros 60. Results and conclusion: Platelets concentrations were more important from 6.2 up to 9.2 times with GPS™ II and from 7.3 up to 8.3 times with GPS™ III compared to blood samples. Efficiency of the collected platelets was around 92% for GPS™ II and 96% for GPS™ III. Both techniques made it possible to collect platelets but, unfortunately, also a lot of red and white blood cells. None of these parameters showed any significant difference (p>0.05). Conflicts of interests: The 10 devices GPS™ II and GPS™ III were provided gracefully by the firm Biomet Biologics TTC. [less ▲]

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See detail"Grace of the Crocodiles" Towards Deterritorialization of Culture in Robert Drewe's Grace
Delrez, Marc ULg

in Collier, Gordon; Delrez, Marc; Fuchs, Anne (Eds.) et al Engaging with Literature of Commitment, Volume 2: The Worldly Scholar (2012)

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See detailGrade retention at the transition to secondary school: A quasi-experimental study of its consequences on relationships with parents and peers
Lecocq, Aurélie; Mathys, Cécile ULg; Véronneau, Marie-Hélène

Conference (2014, May)

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See detailThe Grader layered intrusion (Havre-Saint-Pierre anorthosite, Québec) and genesis of nelsonite and other Fe-Ti-P ores
Charlier, Bernard ULg; Sakoma, Emmanuel; Sauvé, Martin et al

in Lithos (2008), 101(3-4), 359-378

The Grader layered intrusion is part of the Havre-Saint-Pierre anorthosite in the Grenville Province (Quebec, Canada). This intrusion has a basin-like morphology and contains significant resources of ... [more ▼]

The Grader layered intrusion is part of the Havre-Saint-Pierre anorthosite in the Grenville Province (Quebec, Canada). This intrusion has a basin-like morphology and contains significant resources of Fe–Ti–P in ilmenite and apatite. Outcropping lithologies are massive oxide alternating with anorthosite layers, banded ilmenite–apatite–plagioclase rocks and layered oxide apatite (gabbro-)norites. Drill cores provide evidence for stratigraphic variations of mineral and whole rock compositions controlled by fractional crystallization with the successive appearance of liquidus phases: plagioclase and ilmenite followed by apatite, then orthopyroxene together with magnetite, and finally clinopyroxene. This atypical sequence of crystallization resulted in the formation of plagioclase–ilmenite–apatite cumulates or “nelsonites” in plagioclase-free layers. Fine-grained ferrodiorites that cross-cut the cumulates are shown to be in equilibrium with the noritic rocks. The high TiO2 and P2O5 contents of these assumed liquids explains the early saturation of ilmenite and apatite before Fe–Mg silicates, thus the nelsonites represent cumulates rather than crystallized Fe–Ti–P-rich immiscible melts. The location of the most evolved mineral and whole rock compositions several tens of meters below the top of the intrusion, forming a sandwich horizon, is consistent with crystallization both from the base and top of the intrusion. The concentrations of V and Cr in ilmenite display a single fractionation path for the different cumulus assemblages and define the cotectic proportion of ilmenite to 21 wt.%. This corresponds to bulk cotectic cumulates with ca. 8 wt.% TiO2, which is significantly lower than what is commonly observed in the explored portion of the Grader intrusion. The proposed mechanism of ilmenite-enrichment is the lateral removal of plagioclase due to its relative buoyancy in the dense ferrodiorite melt. This plagioclase has probably accumulated in other portions of the intrusion or has not been distinguished from the host anorthosite. [less ▲]

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See detailGradient Boosted Regression Trees in Scikit-Learn
Prettenhofer, Peter; Louppe, Gilles ULg

Conference (2014, February 23)

This talk describes Gradient Boosted Regression Trees (GBRT), a powerful statistical learning technique with applications in a variety of areas, ranging from web page ranking to environmental niche ... [more ▼]

This talk describes Gradient Boosted Regression Trees (GBRT), a powerful statistical learning technique with applications in a variety of areas, ranging from web page ranking to environmental niche modeling. GBRT is a key ingredient of many winning solutions in data-mining competitions such as the Netflix Prize, the GE Flight Quest, or the Heritage Health Price. We give a brief introduction to the GBRT model and regression trees -- focusing on intuition rather than mathematical formulas. The majority of the talk is dedicated to an in depth discussion how to apply GBRT in practice using scikit-learn. We cover important topics such as regularization, model tuning and model interpretation that should significantly improve your score on Kaggle. [less ▲]

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