Our results strongly suggest that P2X1 ion channels play a protective role in sepsis by negatively regulating systemic neutrophil activation, thereby limiting oxidative damage, activation of coagulation and platelet accumulation into the lungs. Therefore, since antagonists of P2X1 ion channels may not only target platelets but also affect neutrophils, inhibiting these channels in the highly inflammatory environment of severe sepsis or of acute coronary syndromes might be detrimental. [less ▲]Detailed reference viewed: 26 (10 ULg) Les billes alginate-chitosane : un nouveau biomatériau pour la réparation des lésions du cartilageOprenyeszk, Frédéric ; Sanchez, Christelle ; Dubuc, Jean-Emile et alin Revue du Rhumatisme (2011), 78(suppl 5), 129-130Detailed reference viewed: 48 (17 ULg) La motivation du licenciement en droit belgeKefer, Fabienne in Revue de la Faculté de Droit de l'Université de Liège (2011)Detailed reference viewed: 47 (7 ULg) Trend and lifetime of sulfur hexafluoride at mid-latitudes deduced from ACE-FTS occultation measurementsMahieu, Emmanuel ; Duchatelet, Pierre ; Zander, Rodolphe et alin Geophysical Research Abstracts (2011), 13Sulfur hexafluoride (SF6) is one of the strongest greenhouse gases on a per molecule basis, with a global warming potential of 22800 (100-yr horizon). This is an extremely stable gas in the atmosphere ... [more ▼]Sulfur hexafluoride (SF6) is one of the strongest greenhouse gases on a per molecule basis, with a global warming potential of 22800 (100-yr horizon). This is an extremely stable gas in the atmosphere, which results in a very long lifetime, with large uncertainties. The value adopted by IPCC is 3200 years, but some studies suggest shorter lifetimes, as low as 800 years. Surface concentrations are now about 7 ppt, with reported trends indicating a steady and strong increase of 0.3 ppt/yr. Most emissions are of anthropogenic origin, related to its use as an insulator in high-voltage electrical installations. Secondary contributions result from magnesium and aluminum production as well as from the manufacturing of semiconductors (see e.g. Levin et al., 2010; Rigby et al., 2010 and references therein). In this contribution, we use occultation measurements performed by the ACE-FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) instrument, launched in August 2003 onboard the Canadian SCISAT satellite (Bernath et al., 2005). ACE-FTS is still in operation to date, with no significant degradation in its performance. This spectrometer achieves a spectral resolution of 0.02 cm-1 in the broad 750-4400 cm-1 range which covers the unresolved nu-3 band Q branch of SF6 centered at 947.9 cm-1. Signal-to-noise ratios of 200-300 are typically obtained in the spectral region of interest. Version 3 retrievals performed by University of Waterloo give volume mixing ratio profiles of SF6 in the 11-32 km altitude range. We consider all available sunrise and sunset occultation measurements obtained at midlatitudes in both hemispheres to derive the trend of SF6 in the lower stratosphere, from late February 2004 onwards. Consistency between both hemispheres will be investigated. In addition, concurrent N2O measurements are used to evaluate the atmospheric lifetime of SF6, following a method used previously for other long-lived gases (e.g. Zander et al, 1996). Comparisons with trends derived from in situ surface measurements or from ground-based remote-sensing observations (e.g. at the Jungfraujoch station, 46.5ºN) are also included. [less ▲]Detailed reference viewed: 40 (4 ULg) Image appraisal tools for electrical resistivity tomographyCaterina, David ; Beaujean, Jean ; Robert, Tanguy et alin Proceedings of SAGEEP (2011), 24Image appraisal is a problem frequently encountered in electrical resistivity tomography (ERT), and more generally in non-linear geophysical inversion. It may include several aspects such as the ... [more ▼]Image appraisal is a problem frequently encountered in electrical resistivity tomography (ERT), and more generally in non-linear geophysical inversion. It may include several aspects such as the identification of the geometry of buried structures, the detection of numerical artefacts, the estimation of the depth of investigation or the exactitude of inverted parameters. Geophysicists can rely on several tools published in the literature to address these issues. However, few studies offer a quantitative comparison on the performance of these tools concerning the different mentioned aspects. Moreover, to our knowledge, there is no commonly accepted methodology to handle image appraisal. In this contribution, we compared quantitatively the ability of different image appraisal indicators to reach different objectives (geometry, artefacts, depth of investigation, parameter resolution). Among possible image appraisal tools, the model resolution matrix (MRM), the cumulative sensitivity matrix (CSM) and the depth of investigation index (DOI) are the most cited ones and were studied here. We compared them first on numerical models representing different geological situations. This numerical benchmark showed that indicators based on the MRM and CSM were the more appropriate to appraise ERT images in terms of the geometry of structures and the exactitude of inverted parameters, DOI providing mainly qualitative information. On this basis, we propose a methodology to appraise field ERT images focusing on the resolution and geometric aspects (others being implicitly studied). First, True Synthetic Models (TSM), representing simplified cases of field ERT images, are built using available information. Then, through forward modelling, synthetic ERT data are computed and inverted to provide the Inverted Synthetic Models (ISM). Afterwards, a comparison between TSM and ISM (or their gradients for geometry) is made in order to define the errors on inverted parameters. This discrepancy is then plotted with respect to resolution indicator values and points out in every tested cases a resolution range over which the errors abruptly increase allowing the definition of threshold values. The final step consists in applying the threshold values on the field ERT images and to validate the results with a posteriori knowledge. [less ▲]Detailed reference viewed: 138 (37 ULg) Genetic relationships between fertility and content of major fatty acids in milk for first-parity Wallon Holstein cowsBastin, Catherine ; Gengler, Nicolas ; Soyeurt, Hélène in Journal of Dairy Science (2011), 94 E-Suppl 1Detailed reference viewed: 28 (6 ULg) EFFECT OF DIFFERENT WARMING-UP PROTOCOLS ON TIME TO EXHAUSTION AT MAXIMAL AEROBIC SPEEDRodriguez de la Cruz, Carlos ; Brennenraedts, C.; Bury, Thierry in British Journal of Sports Medicine (2011), 45Detailed reference viewed: 42 (17 ULg) Strontium ranelate : an effective solution whatever the patient profilesReginster, Jean-Yves in Osteoporosis International (2011), 22(S5), 756-757Detailed reference viewed: 16 (1 ULg) Comparison of Immune Reconstitution after Non-myeloablative Hematopoietic Cell Transplantation (HCT) with Flu-TBI versus TLI-ATG ConditioningHannon, Muriel ; Humblet-Baron, S.; Graux, C. et alin Belgian Journal of Hematology (2011), Abstracts book(Supplement of 26th General Meeting of the Belgian Hematological Society), 8Detailed reference viewed: 11 (2 ULg) Glucosamine sulfate for structure modification in osteoarthritis : fact of fantasy ?Reginster, Jean-Yves in Ortopedia, Traumatologia, Rehabilitacja (2011), 13(S1), 44Detailed reference viewed: 10 (1 ULg) Efficacy and safety of strontium ranelate in the treatment of knee ostoarthritis : a randomized, double-blind, placebo-controlled international trialReginster, Jean-Yves ; Chapurlat, R.; Christiansen, C. et alin Osteoporosis International (2011), 22(S5), 742-743Detailed reference viewed: 53 (1 ULg) Faire de sa vie une œuvre d'art paralittéraire. Quelques réflexions autour de la littérature-MesrineDenis, Benoît in Etudes Françaises (2011), 47(1), 141-155Detailed reference viewed: 12 (3 ULg) What's new on the horizon in therapyReginster, Jean-Yves in Osteoporosis International (2011), 22(S5), 682Detailed reference viewed: 11 (2 ULg) Les ostéoblastes des zones sclérosées de l’os sous-chondral arthrosique expriment moins de connexine-43 : une explication possible à la diminution de la sensibilité mécanique de ces cellulesSanchez, Christelle ; Pesesse, Laurence ; Henrotin, Yves in Revue du Rhumatisme (2011), 78(suppl 5), 75Detailed reference viewed: 11 (0 ULg) STRATEGY FOR ASSESSING IMPACTS OF THYROID DISRUPTING CHEMICALS IN TELEOSTEANSSchnitzler, Joseph ; Klaren, Peter; Celis, Niko et alin Organohalogen Compounds (2011)Detailed reference viewed: 49 (15 ULg) La Bone sialoprotéine est associée à la différenciation hypertrophique des chondrocytes et aux lésions du cartilage arthrosiquePesesse, Laurence ; Sanchez, Christelle ; Walsh, David et alin Revue du Rhumatisme (2011), 78(suppl 5), 99-100Detailed reference viewed: 21 (2 ULg) Exploration neurodéveloppementale de la mémoire de travail par neuroimagerie fonctionnelleNoro, Magali; Linotte, Sylvie; Ansseau, Marc et alin Encéphale (L') (2011), 37Detailed reference viewed: 57 (6 ULg) Long-term denosuamab treatment in postmenopausal women with osteoporosis : results from the first two years of the FREEDOM trial extensionBone, H.; Chapurlat, R.; Brandi, M. et alin Osteoporosis International (2011), 22(S4), 527-528Detailed reference viewed: 16 (1 ULg) Enjeux et défis du français sur Objectifs Universitaires, à la lumière d’un programme d’urgence dans une université marocaineDefays, Jean-Marc ; Wéry, Laurence in Synergies Monde (2011), II(8), 267-274Detailed reference viewed: 49 (2 ULg) Taux sérique de vitamine D et réponse au traitement par alendronateRoux, C.; Chartier, C.; Boonen, S. et alin Revue du Rhumatisme (2011), 78(S5), 102Detailed reference viewed: 14 (3 ULg) 2-18F-Fluoro-L-tyrosine in the suspicion of recurrence of previously treated gliomas.AGIUS, C.; NAMUR, Gauthier ; COUTURIER, O. et alin European Journal of Nuclear Medicine and Molecular Imaging (2011), 38(SUPPL), 219Detailed reference viewed: 7 (0 ULg) Extended safety observations from denosumab administration in postmenopausal women from FREEDOM and FREEDOM extension trialsBrown, J. P.; Bone, H. G.; Chapurlat, R. et alin Arthritis and Rheumatism (2011), 63(S10), 431-432Detailed reference viewed: 20 (3 ULg) Connexin 43 is downregulated in sclerotic human subchondral osteoblasts: a possible explanation for decrease of mechanosensitivity in these cellsSanchez, Christelle ; Pesesse, Laurence ; Henrotin, Yves in Osteoarthritis and Cartilage (2011), 19(Suppl 1), 200-201Detailed reference viewed: 11 (1 ULg) Récit de paroles et expériences de l’altérité dans Le Monde vrai de MarivauxTilkin, Françoise in Philologia (2011), XXI(Supplementum I), 281-290Detailed reference viewed: 20 (5 ULg) Perception, connaissance et utilisation de l'outil FRAX auprès des médecins généralistes de la Province de Liège (Belgique)Bruyère, Olivier ; Nicolet, Delphine ; Compère, S. et alin Revue du Rhumatisme (2011), 78(S5), 142Detailed reference viewed: 28 (4 ULg) Relation entre les variations de densité minérale osseuse et l'incidence des fractures vertébrales : analyse des 2 dernières années de 10 ans de traitement par ranélate de strontiumBruyère, Olivier ; Reginster, Jean-Yves in Revue du Rhumatisme (2011), 78(S5), 217Detailed reference viewed: 8 (2 ULg) Maintenance of antifracture efficacy over 10 years with strontium ranelate in postmenopausal osteoporosisReginster, Jean-Yves ; Kaufman, J. M.; Devogelaer, J. P. et alin Arthritis and Rheumatism (2011), 63(S10), 436Detailed reference viewed: 37 (8 ULg) Traitement durant cinq ans par denosumab (DMAb) chez des femmes ménopausées ostéoporotiques : résultats d'efficacité des deux premières années de l'extension de l'essai FREEDOMChapurlat, R.; Roux, C.; Papapoulos, S. et alin Revue du Rhumatisme (2011), 78(S5), 214Detailed reference viewed: 14 (1 ULg) ION MOBILITY – MASS SPECTROMETRY AS A NEW APPROACH FOR THE SCREENING OF PESTICIDE RESIDUES IN FOODGoscinny, Séverine ; Touilloux, Romain; Joly, Laure et alin Organohalogen Compounds (2011)Pesticide residue analysis requires methods that can determine hundreds of compounds at low levels in complex food matrices. This challenge has given rise to multi residue methods, the only efficient ... [more ▼]Pesticide residue analysis requires methods that can determine hundreds of compounds at low levels in complex food matrices. This challenge has given rise to multi residue methods, the only efficient analytical approach. This type of analytical method entails a “generic” extraction followed by a soft or no purification step to avoid any analytes looses. With over a 1000 active compounds with different physical chemical properties, gas and liquid chromatography are used as complementary separative techniques. In the past decade, the determination has been performed on tandem mass analyzers, a powerful tool to overcome co-eluting compounds with excellent sensitivity. Nevertheless, these instruments can guarantee these results per acquisition cycles for more or less 150 compounds. This represents a serious limitation when the number of pesticides to be sought for monitoring and MRL enforcement is growing each year. As multiple injections from the same sample are not viable for laboratories, alternative options have to be explored. We propose the investigation of ion mobility (IM) coupled with mass spectrometry as a new approach for pesticide residue analysis in food. [less ▲]Detailed reference viewed: 56 (2 ULg) Dioxins in Human Milk from Different Regions of France: Pilot of the French Longitudinal Study of Children (ELFE)Vandentoren, S; Frery, N; Bidondo, ML et alin Organohalogen Compounds (2011), 73Detailed reference viewed: 19 (3 ULg) Influence of practice characteristics on injury risk in young athletesFrisch, Anne ; Urhausen, Axel; Seil, Romain et alin British Journal of Sports Medicine (2011), 45Detailed reference viewed: 8 (0 ULg) A phase 3 study of the efficacy and safety of Denosumab in men with low bone mineral density : design of the ADAMOOrwoll, E.; Stubbe Teglbjaerg, Ch; Langdahl, B. et alin Journal of Bone and Mineral Research (2011), 26(S1), 511Detailed reference viewed: 26 (2 ULg) Study of the forbidden oxygen lines in a dozen comets observed at the VLT (ESO)Decock, Alice ; Jehin, Emmanuel ; Manfroid, Jean et alin EPSC Abstracts 2011 (2011)The forbidden lines are difficult to analyse because their detection requires high spectral and spatial resolutions. Their analysis is however interesting because it allows the determination of the ... [more ▼]The forbidden lines are difficult to analyse because their detection requires high spectral and spatial resolutions. Their analysis is however interesting because it allows the determination of the spatial distribution and the production rate of the parent molecules, supposedly H2O which doesn't have any feature in the optical range. But as shown by Cochran [2] [3], some issues remain about the nature of the parents of the oxygen atoms. Moreover the width of the green line was found larger than that of the red lines. One of the goals of this study is to determine the parent species that photo-dissociate to produce oxygen atoms and see how this process depends on the heliocentric distance. We present here the results of the analysis of a homogeneous set of high quality spectra of 13 different comets observed with UVES at the ESO VLT since 2002 [4] [5]. [less ▲]Detailed reference viewed: 28 (8 ULg) Questionnement agroécologique: les systèmes participatifs de garantie comme critique de la certification et nouveau mode de gouvernance?Stassart, Pierre M ; Brandenburg, Alfio; Isaguirre, Katyain SFER Online http://www.sfer.asso.fr/les_colloques2/les_transversalites_de_l_agriculture_biologique/programme_actes_du_colloque (2011)Ce papier propose un questionnement agroécologique sur la transition agroécologique comme un processus de réflexivité de second ordre. Nous construisons cette hypothèse en prenant le cas de l’émergence ... [more ▼]Ce papier propose un questionnement agroécologique sur la transition agroécologique comme un processus de réflexivité de second ordre. Nous construisons cette hypothèse en prenant le cas de l’émergence des Systèmes Participatif de Garantie (SPG) au Brésil comme une critique de la certification déléguée à une tierce partie et une proposition alternative de gouvernance face au contrôle de conformité marchand. Nous prenons en particulier le cas d’Ecovida et de sa certification participative qui est à l’origine des SPG brésiliennes. Le statut de notre communication est prospectif : après avoir précisé ce que nous entendons par réflexivité, nous posons une série de questions qui portent à la fois sur l’apprentissage et la réflexivité de cette expérience#!Cette mise à l’épreuve nous intéresse dans la mesure où elle peut nous informer sur ce que peuvent devenir des modes de gouvernance réflexifs dans le monde de la bio. [less ▲]Detailed reference viewed: 61 (2 ULg) Processing aortic and pulmonary artery waveforms to derive the ventricle time-varying elastanceStevenson, D. J.; Hann, C. E.; Chase, G. J. et alin IFAC Proceedings Volumes (IFAC-PapersOnline) (2011), 18(PART 1), 587-592Time-varying elastance of the ventricles is an important metric both clinically and as an input for a previously developed cardiovascular model. However, currently time-varying elastance is not normally ... [more ▼]Time-varying elastance of the ventricles is an important metric both clinically and as an input for a previously developed cardiovascular model. However, currently time-varying elastance is not normally available in an Intensive Care Unit (ICU) setting, as it is an invasive and ethically challenging metric to measure. A previous paper developed a method to map less invasive metrics to the driver function, enabling an estimate to be achieved without invasive measurements. This method requires reliable and accurate processing of the aortic and pulmonary artery pressure waveforms to locate the specific points that are required to estimate the driver function. This paper details the method by which these waveforms are processed, using a data set of five pigs induced with pulmonary embolism, and five pigs induced with septic shock (with haemofiltration), adding up to 88 waveforms (for each of aortic and pulmonary artery pressure), and 616 points in total to locate. 98.2% of all points were located to within 1% of their true value, 0.81% were between 1% and 5%, 0.65% were between 5% and 10%, the remaining 0.32% were below 20%.© 2011 IFAC. [less ▲]Detailed reference viewed: 20 (0 ULg) Impact of chronic graft-versus-host disease (GVHD) after reduced intensity conditioning (RIC) allogeneic stem cell transplantation (allo-SCT) as treatment for acute myeloid leukemia (AML) : a survey from the Acute Leukemia Working Party of the EBMTBaron, Frédéric ; Labopin, Myriam; Niederwieser, Dietger et alin Blood (2011), 118The goal of RIC allo-SCT is to harness the graft-versus-leukemia (GVL) effect, while minimizing toxicities and the risk of GVHD. However, prior studies have shown a lower risk of relapse in AML patients ... [more ▼]The goal of RIC allo-SCT is to harness the graft-versus-leukemia (GVL) effect, while minimizing toxicities and the risk of GVHD. However, prior studies have shown a lower risk of relapse in AML patients (pts) who experienced chronic GVHD after RIC allo-SCT versus in those who did not. Here, we investigated the impact of occurrence of GVHD on transplantation outcomes in a large cohort of AML pts given allogeneic PBSC after RIC conditioning. Data from 1859 AML pts in first (n=1439) or second (n=420) CR transplanted between 2000 and 2009 following a RIC regimen at EBMT affiliated centres were analyzed. Pts were given PBSC from HLA-identical sibling (MRD, n=1208), or from HLA-matched unrelated donors (MUD, n=651). Median pt age at transplantation was 56 y (range, 18–77). 338 male pts were given grafts from female donors. RIC was based on low-dose TBI in 520 (28%) pts, while the remaining pts received chemotherapy-based RIC. ATG was given in 269 (22%) MRD and in 267 (41%) MUD recipients, respectively, while 151 (13%) MRD and 165 (25%) MUD recipients received in-vivo T cell depletion with alemtuzumab. The impact of chronic GVHD on relapse risk, non-relapse mortality (NRM), leukemia-free survival (LFS), and overall survival (OS) was assessed using time-dependent multivariate Cox models and in a landmark analysis at 18 months after transplant. Three-year incidences of relapse, NRM, LFS and OS were 34±1%, 15±1%, 51±2% and 60±2% in MRD recipients, respectively, and 34±2% (p=NS), 24±2% (P<0.001), 42±2% (P=0.001) and 47±2% (P=0.001) in MUD recipients, respectively. Grade II, III and IV acute GVHD were observed in 133 (11%), 61 (5%) and 30 (2%) MRD recipients and in 119 (18%), 41 (6%) and 24 (4%) MUD recipients, respectively. The 3-y cumulative incidence of chronic GVHD was 47%. Fifty-three percent of patients with chronic GVHD had extensive chronic GVHD, while the remaining 47% had limited chronic GVHD. In multivariate analyses, occurrence of grade II-IV acute GVHD was associated with a lower risk of relapse (HR=0.8; P=0.04), a higher risk of chronic (HR=2.2; P<0.001) and extensive chronic GVHD (HR=2.8; P<0.001), a higher risk of NRM (HR=2.4 P<0.001), a worsened LFS (HR=1.3; P=0.01), and a worsened OS (HR=1.5; P<0.001). In multivariate time-dependent analyses, occurrence of limited chronic GVHD was associated with a lower risk of relapse (HR=0.7; P=0.05), comparable NRM (HR=1.4; P=0.16), comparable LFS (HR=0.9; P=0.29) and better OS (HR=0.5; P<0.001), while occurrence of extensive chronic GVHD was associated with a lower risk of relapse (HR=0.6; P=0.01), higher NRM (HR=3.2; P<0.001), a trend for worsened LFS (HR=1.3; P=0.06) and comparable OS (HR=0.9; P=0.34). The median interval from transplantation to occurrence of chronic GVHD was 163 (range, 100–1545) days. To further assess the graft-versus-leukemia effect of chronic GVHD, we performed a landmark analysis in patients who were leukemia-free at 18 months after transplantation (n=776). Median follow-up from this landmark time-point was 24 (range, 0.1–112) months. Two-year relapse, NRM, LFS and OS were 16±2%, 2.5±1%, 82±2%, and 89±2%, respectively, in patients without chronic GVHD before the landmark time-point, versus 9±1% (P=0.001), 8±1% (P<0.001), 83±2% (P=0.65), and 86±2% (P=0.38), respectively, in patients with chronic GVHD before the landmark time-point.In conclusion, in this cohort of AML patients transplanted in remission, occurrence of chronic GVHD was associated with a lower risk of relapse that translated to better OS in patients with limited chronic GVHD but not in those with extensive chronic GVHD who experienced higher long term NRM, highlighting the need for long term prospective assessment of long term effects and quality of life in patients receiving RIC allo-SCT. [less ▲]Detailed reference viewed: 22 (2 ULg) High-Energy Physics with Particles Carrying Non-Zero Orbital Angular MomentumIvanov, Igor in Few-Body Systems (2011)Thanks to progress in optics in the past two decades, it is possible to create photons carrying well-defined non-zero orbital angular momentum (OAM). Boosting these photons into high-energy range ... [more ▼]Thanks to progress in optics in the past two decades, it is possible to create photons carrying well-defined non-zero orbital angular momentum (OAM). Boosting these photons into high-energy range preserving their OAM seems feasible. Intermediate energy electrons with OAM have also been produced recently. One can, therefore, view OAM as a new degree of freedom in high-energy collisions and ask what novel insights it can bring. Here we discuss generic features of scattering processes involving twisted particles in the initial state. We show that they make it possible to perform a Fourier analysis of a plane wave cross section with respect to the azimuthal angles of the initial particles, and to probe the autocorrelation function of the amplitude, a quantity inaccessible in plane wave collisions. [less ▲]Detailed reference viewed: 15 (4 ULg) Fibulin-3 fragments (FIB3-1 and FIB3-2) are potential new biomarkers for the diagnosis of osteoarthritisGharbi, M; Dubuc, JE; Deberg, M et alin Annals of the Rheumatic Diseases (2011), 70(Suppl 3), 354Detailed reference viewed: 23 (0 ULg) Assessment of the enhanced assumed strain (EAS) and the assumed natural strain (ANS) techniques in the mechanical behavior of the SSH3D solid-shell elementDuchene, Laurent ; Ben Bettaieb, Amine ; Habraken, Anne in Complas XI (2011)Detailed reference viewed: 49 (25 ULg) Denosumab therapy in postmenopausal women with osteoporosis : results from the first two years of the freedom trial extensionBone, H. G.; Chapurlat, R.; Brandi, M. L. et alin Endocrine Reviews (2011), 32Detailed reference viewed: 43 (1 ULg) Levels of PCDD/Fs and PCBs in Camel Milk (Camelus Bactrianus and Camelus Dromedarius) from KazakhstanKonuspeyeva, G; Faye, B; De Pauw, Edwin et alin Organohalogen Compounds (2011), 73Detailed reference viewed: 18 (0 ULg) A methodology to assess the exactness of Stream Network modeling process on agricultural watershedsOuedraogo, Mohamar ; Degre, Aurore ; Beckers, Eléonore et alin Geophysical Research Abstracts (2011)The goal of our study is to evaluate the exactness of stream network modeling process on agricultural watersheds. Agricultural watersheds topography is always changing, making it difficult to be modeled ... [more ▼]The goal of our study is to evaluate the exactness of stream network modeling process on agricultural watersheds. Agricultural watersheds topography is always changing, making it difficult to be modeled. According to the standard ISO-7078 (ISO-7078, 1985) of the Inernational Organization of Standardization, the exactness of a measurement process or a modeled process can be defined as the difference between results obtained from the measurement process and a reference accepted as the «true value». A small watershed of a dozen hectares size has been surveyed by terrestrial LiDAR (Light Detecting And Ranging) scanner and photogrammetrical techniques to produce a row data of 30 cm resolution. Three interpolation techniques i.e. natural neighbourg, multiquadratic radial basis function and inverse distance weighted have been applied on the original data to create original digital elevation models (DEM) of 1 m resolution. RTK (Real Time Kinematics) GPS (Global Positionning System) ground control points have been surveyed on the watershed to evaluate DEM errors and fit a variogram that is used by a conditional sequencial gaussian simulation model to generate error maps. However, ground control point’s elevations accuracy is depending on the microtopography of parcels in an agricultural watershed. Depending on the crop that is planned by the farmer, the soil tillage will be different, and soil structure and roughness can considerably influence ground control point’s elevation. Analysis of variance and geostatistical methods have been applied on total station and RTK GPS data to estimate intervals in which, ground control points elevations vary. These intervals have been estimated for two parcels that soils are tilled in different ways. These errors are added to the generated errors maps to create final error maps. The final errors maps are added to the original DEM to create likely DEM realizations for the watershed (Temme and al., 2007). Then, two spurious sinks filtering methods (Colson 2006; Lindsay and Creed, 2005) and one flat area treatment method (Jenson and Domingue, 1988) are applied on each DEM realization for preprocessing. Finally, the three common flow direction extraction methods (D8, D-infity and Multiple Flow Direction) are applied on each preprocessed DEM to extract stream Network. The extracted stream network is overlapped with RTK GPS field positioned stream network i.e. a polyline format data. To estimate the exactness of the stream extraction methods, the polyline format is converted in raster format. That allows to compute for each pixel of the observed stream network, the distance to the extracted stream network. Then, for each pixel the mean distance can be calculated, and can be represented through the stream network. LiDAR technology is becoming useful for environment modeling because of his accuracy. Such quantity of data is not free of errors. This research will allow us to estimate the uncertainty of stream network modeled from agricultural watersheds by considering the main sources of errors that are propagated through computing processes. [less ▲]Detailed reference viewed: 45 (11 ULg) Maxwell rigidity and topological constraints in amorphous phase-change networksMicoulaut, M.; Otjacques, C.; Raty, Jean-Yves et alin AIP Conference Proceedings (2011), 1393By analyzing first-principles molecular-dynamics simulations of different telluride amorphous networks, we develop a method for the enumeration of radial and angular topological constraints, and show that ... [more ▼]By analyzing first-principles molecular-dynamics simulations of different telluride amorphous networks, we develop a method for the enumeration of radial and angular topological constraints, and show that the phase diagram of the most popular system Ge-Sb-Te can be split into two compositional elastic phases: a tellurium rich flexible phase and a stressed rigid phase that contains most of the materials used in phase-change applications. This sound atomic scale insight should open new avenues for the understanding of phase-change materials and other complex amorphous materials from the viewpoint of rigidity. [less ▲]Detailed reference viewed: 18 (0 ULg) A Multi-wavelength study with the ESO VLT of comet 103P/Hartley2 at the time of the EPOXI encounterJehin, Emmanuel ; Hutsemekers, Damien ; Manfroid, Jean et alin EPSC Abstracts 2011 (2011)We report on simultaneous optical and infrared spectroscopic observations of the Jupiter Family comet 103P/Hartley2 performed with the UT-1 and UT-2 8-m Unit Telescopes of the ESO Very Large Telescope ... [more ▼]We report on simultaneous optical and infrared spectroscopic observations of the Jupiter Family comet 103P/Hartley2 performed with the UT-1 and UT-2 8-m Unit Telescopes of the ESO Very Large Telescope (VLT). These coordinated observations were carried on during several nights (2010 Nov. 5, 9, 10 and 11 UT) around the NASA EPOXI encounter with the comet on Nov. 4 [1] and in support to the key program « Water and related chemistry in the Solar System » (HssO) [2] of the Herschel Space Observatory. From high resolution optical spectroscopy of the CN (0,0) 388 nm band using UVES at UT2 we determined the isotopic ratios 12C/13C = 95 ± 15 and 14N/15N = 155 ± 25 in the CN radical. From the NH2 (0,9,0) and the H2O+ bands around 600 nm, we derived a nuclear spin temperature of 33 ± 3 K for NH3 and 36 +7/-6 K for H2O. These values are similar to those found in Oort- Cloud and Jupiter Family comets. From lowresolution long-slit spectroscopy with FORS2 at UT1 we will determine the CN, C2 and C3 spatial profiles and their production rates. From the high-resolution near-IR spectra that we collected with CRIRES at UT1 we will measure simultaneously the production rates and mixing ratios of the parent molecules H2O, HCN, C2H6, and CH3OH that are well detected in our spectra and we will study the link to the daughter species. 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[more ▼]We show that the two complementary pictures of large $N_c$ baryons - the single-quark orbital excitation about a symmetric core and the meson-nucleon resonance -- are compatible for $\ell$ = 3 SU(4) baryons. The proof is based on a simple Hamiltonian including operators up to order $\mathcal{O}(N^0_c)$ used previously in the literature for $\ell$ = 1. [less ▲]Detailed reference viewed: 3 (0 ULg)