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See detailInfluence of the ionospheric model on DCB computation and added value of LEO satellites
Wautelet, Gilles ULg; Lestarquit, Laurent; Loyer, Sylvain et al

Poster (2016, April)

In order to compute inter-frequency Differential Code Biases (DCBs), the Geometry-Free combination of a GNSS signal pair needs to be corrected from the ionospheric refraction effect. Such information is ... [more ▼]

In order to compute inter-frequency Differential Code Biases (DCBs), the Geometry-Free combination of a GNSS signal pair needs to be corrected from the ionospheric refraction effect. Such information is obtained using either Global Ionospheric Maps (GIMs) or local models. In this work we investigate the influence of GIMs on the final value and precision of DCB solution. The study covers different ionospheric conditions, ranging from very quiet ionospheric background up to a severe ionospheric storm. In a first step, the Slant Total Electron Content (STEC) between GIMs is assessed as a function of receiver latitude, elevation mask and ionospheric conditions. Then, daily DCBs are estimated using these different GIMs, receiver and satellite contributions being separated using a zero-mean constraint. At last, an independent estimation of DCBs is performed using Low Earth Orbit (LEO) observations (such as JASON's GPS data). This solution is compared with our ground network solution and with DCBs coming from Analysis Centers (ACs) of the International GNSS Service providing ionospheric and DCB solutions. [less ▲]

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See detailGood prognosis factors after a platelet rich plasma (PRP) injection for tendinopathies ?
Kaux, Jean-François ULg; Sancerne, Audrey; Libertiaux, Vincent ULg

in European Journal of Physical and Rehabilitation Medicine (2016, April), 52(suppl. 1 No. 2), 251

Introduction : Platelet-rich plasma injections are a recent treatment for chronic tendinopathies. However, this theraeutic remains controversed in litterature. Up to now, there is no prognosis factors ... [more ▼]

Introduction : Platelet-rich plasma injections are a recent treatment for chronic tendinopathies. However, this theraeutic remains controversed in litterature. Up to now, there is no prognosis factors identified to predict a good evolution after injection of PRP. Purpose: The aims of this study were to evaluate the effect of PRP injection followed by a standardized reeducation protocol among patients suffering from different tendinopathies and to determine the good prognosis factors, if any. Methods : 51 patients suffering from different tendinopathies and refractory to conventional physiotherapy were treated with a PRP injection. Prior to the injection, a blood sample was drawn and some biological parameters (glycemia, cholesterol level, …). A pain assessment was then made using a visual analog scale (VAS) and a pressure algometer. The same assessment was carried out after 6 weeks and 12 weeks when possible. Results : There is an overall significant improvement VAS score at the end of the 12 weeks follow- up. However, no correlation was found between the evolution of the clinical scores and the biological parameters measured. Discussion and Conclusions : A PRP injection followed by a program of eccentric rehabilitation positively affects the algo-functional scores of patients with tendinopathie who were refractory to conventional physiotherapy, whatever their initial biological parameters. [less ▲]

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See detailExploring the effect of a second closely-timed infiltration of platelet-rich plasma to treat proximal patellar tendinopathies
Kaux, Jean-François ULg; CROISIER, Jean-Louis ULg; FORTHOMME, Bénédicte ULg et al

in European Journal of Physical and Rehabilitation Medicine (2016, April), 54(Suppl. 1 No. 2), 199

Intorduction: Some clinical series have evaluated the effect of platelet-rich plasma (PRP) in the treatment of jumper’s knee. Although it is possible that a single infiltrative administration may prove to ... [more ▼]

Intorduction: Some clinical series have evaluated the effect of platelet-rich plasma (PRP) in the treatment of jumper’s knee. Although it is possible that a single infiltrative administration may prove to be an effective treatment for this indication, most of the existing studies evaluated the effects of 2 or 3 successive infiltrations. Purpose: The aim of this study was to evaluate whether 2 infiltrations of PRP proves more effective than a single treatment. Methods: Twenty patients suffering from chronic jumper’s knee were enrolled into the study and split into two randomized groups (1 or 2 infiltrations of PRP, respectively). The 3-month follow-up evaluation consisted of VAS, IKDC and VISA-P scores, along with algometer, isokinetic and ultrasounds evaluations. After 1 year, subjects were contacted to define their functional evolution. Results: The concentration of the PRP used for each infiltration was similar in both groups, and contained no red or white cells. Results revealed no difference in treatment efficacy between the groups. Discussion and Conclusion: The comparison between 1 or 2 infiltrations of PRP did not reveal any difference between the 2 groups at short to mid term. A second closely-timed infiltration of PRP to treat jumper’s knees is not necessary to improve the efficacy of this treatment in the short term. A second infiltration should perhaps be envisaged later, but this remains to be demonstrated. [less ▲]

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See detailExercise-triggered chest pain as an isolated symptom of myocarditis in children
Tshimanga, Prisca; Daron, Benoît; FARHAT, Nesrine ULg et al

in Clinics and Practice (2016)

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See detailiPot: Improved potato monitoring in Belgium using remote sensing and crop growth modelling
Piccard, Isabelle; Gobin, Anne; Curnel, Yannick et al

Poster (2016, April)

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See detailOpen Access and Discovery Tools: How do Primo Libraries Manage Green Open Access Collections?
Renaville, François ULg

in Varnum, Kenneth J. (Ed.) Exploring Discovery: The Front Door to Your Library's Licensed and Digitized Content (2016)

Scholarly Open Access repositories contain lots of treasures including rare or otherwise unpublished materials and articles that scholars self-archive, often as part of their institution's mandate. But it ... [more ▼]

Scholarly Open Access repositories contain lots of treasures including rare or otherwise unpublished materials and articles that scholars self-archive, often as part of their institution's mandate. But it can be hard to discover this material unless users know exactly where to look. Since the very beginning, libraries have played a major role in supporting the OA movement. Next to all services they can provide to support the deposit of research output in the repositories, they can make Open Access materials widely discoverable by their patrons through general search engines (Google, Bing...), specialized search engines (like Google Scholar) and library discovery tools, thus expanding their collection to include materials that they would not necessarily pay for. In this paper, we intend to focus on two aspects regarding Open Access and Primo discovery tool. In early 2013, Ex Libris Group started to add institutional repositories to Primo Central Index (PCI), their mega-aggregation of hundreds of millions of scholarly e-resources. After 2 years, it may be interesting to take stock of the current situation of PCI regarding Open Access institutional repositories. On basis of a survey to carry out among the Primo community, the paper also shows how libraries using Primo discovery tool integrate Green Open Access contents in their catalog. Two major ways are possible for them: Firstly, they can directly harvest, index and manage any repository in their Primo and display those free contents next to the more traditional library collections; Secondly, if they are PCI subscribers, they can quickly and easily activate any, if not all, of the Open Access repositories contained PCI, making thus the contents of those directly discoverable to their end users. [less ▲]

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See detailA nonlinear state-space solution to a hysteretic benchmark in system identification
Noël, Jean-Philippe ULg; Esfahani, Alireza; Kerschen, Gaëtan ULg et al

Conference (2016, April)

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See detailIdentification of nonlinear frequency responses and bifurcations from experimental data
Noël, Jean-Philippe ULg; Gourc, Etienne ULg; Grappasonni, Chiara ULg et al

in Actes de CFA/VISHNO 2016 (2016, April)

The objective of the paper is to obtain the frequency response curves of nonlinear mechanical systems from broadband testing. The proposed approach consists in coupling an identification method with a ... [more ▼]

The objective of the paper is to obtain the frequency response curves of nonlinear mechanical systems from broadband testing. The proposed approach consists in coupling an identification method with a continuation method. Specifically, the frequency-domain nonlinear subspace identification (FNSI) method is first used to derive an experimental model of the structure in state-space from broadband measurements. The harmonic balance method coupled with arclength continuation then utilizes this experimental model to compute the frequency response curves of the system. The method is demonstrated using a numerical example. [less ▲]

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See detailUsing a polynomial decoupling algorithm for state-space identification of a Bouc-Wen system
Esfahani, Alireza; Dreesen, Philippe; Tiels, Koen et al

Conference (2016, April)

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See detailAdaptation transculturelle et validation des questionnaires VISA-P et VISA-A en français
Kaux, Jean-François ULg; Delvaux, François ULg; Oppong-Kyei, Julian et al

in Science & Sports (2016), 31(2), 65-72

Objectives Patellar and calcaneal tendinopathies remain very common musculoskeletal disorders in athletes. The Victorian Institute of Sports Assessment – Patellar and – Achilles (VISA-P and VISA-A ... [more ▼]

Objectives Patellar and calcaneal tendinopathies remain very common musculoskeletal disorders in athletes. The Victorian Institute of Sports Assessment – Patellar and – Achilles (VISA-P and VISA-A), English questionnaires developed respectively to assess the severity of patellar and calcaneal tendinopathies. The purpose of our study was to validate a French version of these questionnaires. Materials and methods The French translation and intercultural adaptation of the VISA-P and the VISA-A are made according to international recommendations. For these adaptations, 92 (VISA-P) and 116 (VISA-A) subjects were recruited and divided into 3 groups (pathological, asymptotic and sporting risk), in order to test these psychometric properties. All these subjects also had to answer to the MOS SF-36 for the validity of construct. Results The mean VISA-PF scores were 99 for the healthy people, 53 for patients with patellar tendinopathy and 86 for the athletes. The VISA-PF shows excellent reliability with an inter-class correlation coefficient of 0.99. The internal consistency was 0.9 (Cronbach's alpha). The VISA-PF shows low correlations with the divergent sub-scales of the SF-36 and moderate correlations with the convergent sub-scales of the SF-36. The mean VISA-AF scores were 99 in the healthy group, 59 in the pathological group, and 94 in the group of athletes. The VISA-AF shows excellent reliability with an inter-class correlation coefficient of 0.99. The internal consistency was 0.92 (Cronbach's alpha). The VISA-AF shows low correlations with the divergent sub-scales of the SF-36 and moderate correlations with the convergent sub-scales of the SF-36. No floor and ceiling effects were detected during the evaluation of the two questionnaires. Conclusion The French versions of the VISA-P and VISA-A questionnaires are therefore French comprehensible adaptation, reliable and adapted to French-speaking patients suffering from patellar or calcaneal tendinopathies. [less ▲]

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See detailThe Fractal Nature of Mars Topography Analyzed via the Wavelet Leaders Method
Kleyntssens, Thomas ULg; Deliège, Adrien ULg; Nicolay, Samuel ULg

in Information Technology: New Generations (2016, April)

This paper studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At ... [more ▼]

This paper studies the scaling properties of Mars topography based on Mars Orbiter Laser Altimeter (MOLA) data through the wavelet leaders method (WLM). This approach shows a scale break at 15 km. At small scales, these topographic profiles display a monofractal behavior while a multifractal nature is observed at large scales. The scaling exponents are greater at small scales. They also seem to be influenced by latitude and may indicate a slight anisotropy in topography. [less ▲]

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See detailA New Wavelet-Based Mode Decomposition for Oscillating Signals and Comparison with the Empirical Mode Decomposition
Deliège, Adrien ULg; Nicolay, Samuel ULg

in Information Technology: New Generations (2016, April)

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” ... [more ▼]

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” wavelet-based decomposition and the empirical mode decomposition (EMD). We compare the reconstruction skills and the period detection ability of the method with the well-established EMD on toys examples and the ENSO climate index. It appears that the EWMD accurately decomposes and reconstructs a given signal (with the same efficiency as the EMD), it is better at detecting prescribed periods and is less sensitive to noise. This work provides the first version of the EWMD. Even though there is still room for improvement, it turns out that preliminary results are highly promising. [less ▲]

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See detail[Beamer] A New Wavelet-Based Mode Decomposition for Oscillating Signals and Comparison with the Empirical Mode Decomposition
Deliège, Adrien ULg; Nicolay, Samuel ULg

Conference (2016, April)

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” ... [more ▼]

We introduce a new method based on wavelets (EWMD) for decomposing a signal into quasi-periodic oscillating components with smooth time-varying amplitudes. This method is inspired by both the “classic” wavelet-based decomposition and the empirical mode decomposition (EMD). We compare the reconstruction skills and the period detection ability of the method with the well-established EMD on toys examples and the ENSO climate index. It appears that the EWMD accurately decomposes and reconstructs a given signal (with the same efficiency as the EMD), it is better at detecting prescribed periods and is less sensitive to noise. This work provides the first version of the EWMD. Even though there is still room for improvement, it turns out that preliminary results are highly promising. [less ▲]

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See detailMars Topography Investigated Through the Wavelet Leaders Method: a Multidimensional Study of its Fractal Structure
Deliège, Adrien ULg; Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Poster (2016, April)

This work examines the scaling properties of Mars topography through a wavelet-based formalism. We conduct exhaustive one-dimensional (both longitudinal and latitudinal) and two-dimensional studies based ... [more ▼]

This work examines the scaling properties of Mars topography through a wavelet-based formalism. We conduct exhaustive one-dimensional (both longitudinal and latitudinal) and two-dimensional studies based on Mars Orbiter Laser Altimeter (MOLA) data using the multifractal formalism called Wavelet Leaders Method (WLM). This approach shows that a scale break occurs at approximately 15 km, giving two scaling regimes in both 1D and 2D cases. At small scales, these topographic profiles mostly display a monofractal behavior while a switch to multifractality is observed in several areas at larger scales. The scaling exponents extracted from this framework tend to be greater at small scales. In the 1D context, these observations are in agreement with previous works and thus suggest that the WLM is well-suited for examining scaling properties of topographic fields. Moreover, the 2D analysis is the first such complete study to our knowledge. It gives both a local and global insight on the scaling regimes of the surface of Mars and allows to exhibit the link between the scaling exponents and several famous features of the Martian topography. These results may be used as a solid basis for further investigations of the scaling laws of the Red planet and show that the WLM could be used to perform systematic analyses of the surface roughness of other celestial bodies. [less ▲]

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See detailPrevalence and determinants of vitamin D deficiency in healthy French adults: the VARIETE study
Souberbielle; Massart, Catherine; Brailly-Tabard, Sylvie et al

in Endocrine (2016)

The U.S. Institute of Medicine considers that a serum 25-hydroxyvitamin D (25OHD) concentration >20 ng/mL corresponds to optimal vitamin D status in the general population. Old studies of vitamin D status ... [more ▼]

The U.S. Institute of Medicine considers that a serum 25-hydroxyvitamin D (25OHD) concentration >20 ng/mL corresponds to optimal vitamin D status in the general population. Old studies of vitamin D status in the French general population have demonstrated high prevalence of insufficiency. We measured serum 25OHD, 1,25(OH)2D, PTH, calcium, phosphorus, and creatinine levels in 892 French Caucasian healthy subjects (463 men, 429 women) aged from 18 to 89 years. The 25OHD concentration was similar in men (24.1 ± 8.2 ng/mL) and women (23.4 ± 8.0 ng/mL). 25OHD concentrations of <10, <12, <20, and <30 ng/mL were found in respectively 6.3, 9.9, 34.6, and 80.3 % of subjects. Residence in northern France (odds ratio [OR] 1.91), blood sampling between January and March (OR 7.74), BMI ≥24 kg/m2 (OR 1.81), and age 60 years or more (OR 1.99) were significant determinants of hypovitaminosis D (25OHD <20 ng/mL). The serum 25OHD level correlated positively with 1,25(OH)2D and negatively with PTH. 25OHD values below 20 ng/mL were associated with lower 1,25(OH)2D levels, and 25OHD values below 27 ng/mL were associated with higher PTH levels. Many French healthy adults have a 25OHD concentration <20 ng/mL, especially during winter months. Actions to improve the vitamin D status of the French general population are urgently needed. [less ▲]

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See detailUtopie et anticipation
Stienon, Valérie ULg

Book published by Revue Textyles - Éditions Samsa (2016)

Prolifique dans les littératures de l’imaginaire, la Belgique présente pourtant une inconnue à propos du récit d’anticipation. De la fin du monde de Rosny aîné à celle de Luc Dellisse, des aventures ... [more ▼]

Prolifique dans les littératures de l’imaginaire, la Belgique présente pourtant une inconnue à propos du récit d’anticipation. De la fin du monde de Rosny aîné à celle de Luc Dellisse, des aventures spatiales de Bob Morane à la découverte des Cités obscures, du roman scientifique de Henri-Jacques Proumen aux technosciences de Gilbert Hottois, l’anticipation excède les caractéristiques de la science-fiction, croise plus d’une fois l’utopie et redéfinit les rapports entre réel et fiction en une pluralité de mondes possibles. Elle pose des questions cruciales lorsqu’on prend la peine de considérer ses réalisations dans la littérature belge francophone : quels sont les auteurs, les éditeurs et les supports concernés ? existe-t-il des thèmes spécifiques ? quels imaginaires ces fictions privilégient-elles ? comment les genres investis interfèrent-ils avec le merveilleux scientifique, le surréalisme ou le réalisme magique ? En associant des études de cas à une réflexion d’ensemble, les contributions rassemblées dans ce numéro proposent le premier état des lieux d’une production hybride encore peu considérée. Il s’agit d’éclairer la diversité qui caractérise l’anticipation belge, mais aussi de mettre en évidence les raisons de sa faible reconnaissance esthétique et de poser les jalons d’une histoire littéraire capable de saisir des dynamiques multiples de légitimation. [less ▲]

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See detailUne école belge de l’anticipation ?
Stienon, Valérie ULg

in Textyles : Revue des Lettres Belges de Langue Française (2016), 48

Prolifique dans les littératures de l'imaginaire, la Belgique présente pourtant une inconnue s'agissant du récit d'anticipation. Il suffit pour en prendre la mesure de comparer les situations respectives ... [more ▼]

Prolifique dans les littératures de l'imaginaire, la Belgique présente pourtant une inconnue s'agissant du récit d'anticipation. Il suffit pour en prendre la mesure de comparer les situations respectives de ces deux « genres » réputés voisins que sont la science-fiction et le fantastique. Celui-ci a été érigé en emblème des terres du syncrétisme et de l'étrange, tandis que celle-là a souffert d'expressions isolées et de dénis compliquant sa réception. La situation de l'anticipation est plus complexe encore : souvent rattachée à la science-fiction, dont elle constituerait une étape archaïque ou protohistorique, elle ne se confond pas tout à fait avec elle. Ne se définissant pas exclusivement par les thématiques scientifiques ou extraterrestres, ni même par la seule dimension futuriste, l'anticipation se donne pour objet une exploration imaginaire des mondes possibles. Cette exploration s'est manifestée plus d'une fois avec succès dans l'histoire des lettres belges, des fictions de Rosny aîné (Les Xipéhuz, La Force mystérieuse, Les Navigateurs de l'infini) aux mondes parallèles créés par François Schuiten et Benoît Peeters, des aventures spatiales de Bob Morane aux technosciences de Gilbert Hottois. Mais quel dénominateur commun peut-on trouver à ce corpus disparate ? Et comment faire l'archéologie d'une production qui a trouvé des expressions variées et originales malgré une généricité hybride et l'absence de représentant majeur ? [less ▲]

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See detailAnticipation et mondes parallèles. Entretien avec Benoît Peeters et François Schuiten
Stienon, Valérie ULg

in Textyles : Revue des Lettres Belges de Langue Française (2016), 48

Benoît Peeters et François Schuiten ont aimablement accepté l’invitation de l’entretien, qui a eu lieu le 12 janvier 2015 au café Le Wilson en face du Palais de Chaillot où se tient l’exposition Revoir ... [more ▼]

Benoît Peeters et François Schuiten ont aimablement accepté l’invitation de l’entretien, qui a eu lieu le 12 janvier 2015 au café Le Wilson en face du Palais de Chaillot où se tient l’exposition Revoir Paris. [less ▲]

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