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See detailInfluence of rock fragments on hydraulic properties of Ultisols in Ratchaburi Province, Thailand
Khetdan, Channarong; Chittamart, Natthapol; Tawornpruek, Saowanuch et al

in Geoderma Regional (2017), 10

In Thailand, stony soils are mainly located in hillside areas. Even though they have physical limitations for agricultural use and they are exposed to a risk for soil erosion, they continue to be used for ... [more ▼]

In Thailand, stony soils are mainly located in hillside areas. Even though they have physical limitations for agricultural use and they are exposed to a risk for soil erosion, they continue to be used for crop production. A good understanding of the hydraulic characteristics of soils containing an important fraction of rock fragments is crucial for soil and water management in these areas. The objective of this study was to investigate the influence of different rock fragment contents on effective hydraulic properties of skeletal soil with a clay content lower than 35% using measurements of the water retention curve and the hydraulic conductivity. A tension infiltrometer was used to determine the field hydraulic conductivity at four pressure heads (h) of 0, − 30, − 60 and − 120 mm. Soil water retention was determined on a pressure plate between − 33 and − 1500 kPa. Finally, the Hydrus-1D was used to predict soil moisture dynamics using the obtained effective hydraulic parameters. The results show a decreasing water retention capacity with increasing rock fragment content. The saturated hydraulic conductivity decreased with increasing stone contents from 0 to 20%, but then increased for increasing stone content. Contradicting behavior can be observed using field and lab measurements, clearly exposing the need for a better understanding of the functioning of stony soils. [less ▲]

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See detailLe pouvoir judiciaire et l'équilibre des pouvoirs : réflexions à propos des récentes réformes
Bouhon, Frédéric ULiege; Pironnet, Quentin ULiege

in Pyramides : Revue du Laboratoire d'Etudes et de Recherches en Administration Publique (2017), 29

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See detailImpact of a mountain ultra-marathon (UTMB) on cardiac biomarkers
Le Goff, Caroline ULiege; Gergelé, Laurent; Kaux, Jean-François ULiege et al

in European Journal of Sports Medicine (2017, September), 5(Supplement 1), 15-16

OBJECTIVES: While moderate exercise has beneficial effects on the cardiovascular system, consequences of a supraphysiological effort are not clear yet. In particular, the physiological consequences of ... [more ▼]

OBJECTIVES: While moderate exercise has beneficial effects on the cardiovascular system, consequences of a supraphysiological effort are not clear yet. In particular, the physiological consequences of ultramarathons need to be further documented. The aim of the study was to assess the changes of various cardiac biomarkers after a mountain ultramarathon. MATERIAL AND METHODS: Blood and urine samples were collected on 28 runners (17 men) participating to the UltraTrail du Mont Blanc (105 km, total positive elevation: 5600 m) at 3 different times: before the race (Pre), within 1 h after the finish (Post) and 7 days after the finish (D+7). Several biomarkers involved in heart disease (coronary syndrome, heart failure and fibrosis) and in inflammation were assayed on different analyzers such a COBAS® (for CKMB,TnThs, NTproBNP, HFABP and CRPs) and KRYPTOR® (for Copeptin). ST2 was measured manually with the Presage kit from CRITICAL DIAGNOSTIC®. RESULTS: Plasma levels of cardiac markers (CKMB, TnThs, NTproBNP, copeptin, HFABP, ST2) and inflammation (CRPs) increased significantly at Post. Means values increased from Pre to Post as follows: 2.3 to 91.9 UI/L for CKMB (p<0.0001); 7.6 to 31.7 ng/L for TnThs (p<0.0001); 41.7 to 1190.5 ng/L for NTproBNP, 4.2 to 22.9 pmol/L for copeptin (p=0.001); 3.6 to 107.8 ng/mL for HFABP (p<0.0001), 29.7 to 126.2 ng/mL for ST2 (p<0.0001); 0.5 to 29.1 mg/L for CRPs (p<0.0001). With the exception of a few (HFABP, ST2, CRPs) biomarkers in some subjects, all values were back to Pre values at D+7. DISCUSSION/CONCLUSION: Prolonged strenuous running exercise caused an elevation in cardiac biomarkers. Elevation in CKMB levels lacks specificity for cardiac damage as runners have increased CKMB from skeletal muscles as well. Previous studies suggested that exercise induced TnThs elevation is a benign reversible physiologic phenomenon but this parameter, as well as HFABP, could be a sign of ischemia. Different phenomena occurred such as stretch of myocytes causing an increase in pressure or volume and neurohormonal activation which can explain the Copeptine and NTproBNP increase, while ST2 is a biomarker of cardiac remodeling and fibrosis. CRP is an acute phase compound that tends to increase following a strenuous and prolonged bout of exercise and/or muscular injury. As the values tended to return within the normal reference range values within 7 days after the race, our study suggests that there is no permanent structural damage at the myocardium level. [less ▲]

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See detailPlatelet-rich plasma versus hyaluronic acid to treat tendinopathies
Kaux, Jean-François ULiege; Robertjot, Mathieu; SAMSON, Antoine ULiege et al

in European Journal of Sports Medicine (2017, September), 5(Supplement 1), 21-22

INTRODUCTION: The treatment of patellar tendinopathies could be difficult. This is the reason why new treatments have been developed, among which platelet rich plasma (PRP) injections. Some clinical ... [more ▼]

INTRODUCTION: The treatment of patellar tendinopathies could be difficult. This is the reason why new treatments have been developed, among which platelet rich plasma (PRP) injections. Some clinical series have previously evaluated the effect of PRP in the treatment of proximal patellar tendinopathies. Recent systematic review concluded that PRP could be recommend as a treatment in such indication (1). Recently, the viscoelastic properties of hyaluronic acid (HA) on liquid connective tissue have been proposed for the treatment of tendinopathies (2). Some fundamental studies show encouraging results on HA’s ability to promote tendon gliding and reduce adhesion as well as to improve tendon architectural organisation. Some observations also support its use in a clinical setting to improve pain and function. PURPOSE: We aimed to compare the effect of PRP injection versus two injections of HA after three months on patients who have a proximal patellar tendinopathy. METHODS: Thirtythree sportsmen with proximal patellar tendinopathies being not relieved after minimum three months of normal physiotherapy treatments where included. Eighteen of them (group 1) have received a leukocyte poor PRP injection (obtained using an aphaeresis machine (3)) and the other fifteen (group 2) two HA injections, all of them have benefited of standardized rehabilitation. Concerning the evaluation of the pathology, algofunctional tests (visual analogic scale (VAS), pressure algometer, IKDC score, VISAP score), isokinetic (associated to VAS) along with the patellar tendon ultrasonography (US) have been realized over three times (preinjection, after 6 weeks, after 3 months postinjections). RESULTS: The results of VAS (p<0,01), algometric scores (p<0,01), IKDC scores (p<0,01) and VISAP (p<0,01) show a considerable improvement in the two groups, but not for the US findings. For the group 1, isokinetic tests show significative results for the hamstrings in C60°/s with an improvement of maximum peak torque (p=0,01) for the pathological member, a diminution (p>0,05) for the healthy limb and during the analysis of the bilateral difference (p=0,0002). For the group 2, the improvement of quadriceps maximum peak torque in C240°/s is significant (p>0,01) for the pathological knee after 6 weeks post injections only. The VAS associated with isokinetic tests decreases significantly for all contraction modes after three months of study. CONCLUSIONS: Both PRP and HA can improve the symptoms of proximal patellar tendinopathy, even if the results are slightly better in the PRP group. REFERENCES: Andia I et al., Plateletrich plasma in the conservative treatment of painful tendinopathy: a systematic review and metaanalysis of controlled studies. Br Med Bull. 2014 Jun;110(1):99115. Kaux JF et al., Hyaluronic acid and tendon lesions. Muscles Ligaments Tendons J. 2016 Feb 13;5(4):2649. Kaux JF et al. Using platelet rich plasma to treat jumper's knees: Exploring the effect of a second closely timed infiltration. J Sci Med Sport. 2016 Mar;19(3):2004. [less ▲]

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See detailNew computational method of the ball/race contacts transverse loads of high speed ball bearings without race control hypothesis
Servais, Christophe ULiege; Bozet, Jean-Luc ULiege

in Tribology International (2017), 113

Some hypotheses are still necessary in order to access the ball bearing Newtonian equilibrium with quasi-static methods. Among these hypotheses are the values of the transverse loads within ball/race ... [more ▼]

Some hypotheses are still necessary in order to access the ball bearing Newtonian equilibrium with quasi-static methods. Among these hypotheses are the values of the transverse loads within ball/race contacts. Those loads are due to the gyroscopic torques. Nowadays, the transverse loads are estimated without any equilibrium criterion by the specialized literature. Moreover, the race control assumption is often employed in addition to the hypotheses made about the transverse loads. The paper describes a new method to compute the transverse loads without using the race control assumption. Then, a correlation between the ball bearing kinematics and the transverse loads is established. It leads to an accurate and efficient computational method to access the Newtonian equilibrium of high speed ball bearings. [less ▲]

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See detailTranslation and validation of the VISA-P questionnaire for French-speaking patients
Kaux, Jean-François ULiege; Croisier, Jean-Louis ULiege; Bruyère, Olivier ULiege

in European Journal of Sports Medicine (2017), 5(supplement 1), 63

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See detailDEVELOPMENT OF AN ELECTRONIC EDUCATION BOOKLET FOR PATIENTS WITH LOW BACK PAIN
Demoulin, Christophe ULiege; Pauly, Laura; Grosdent, Stéphanie ULiege et al

Conference (2017, September)

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See detailPRELIMINARY STUDY ON BEAM-TO-COLUMN JOINTS UNDER IMPACT LOADING
D'Antimo, Marina ULiege; Latour, Massimo; Rizzano, Gianvittorio et al

in Proceedings CTA 2017 (2017, September)

Recent catastrophic events have pointed out the necessity of ensuring the integrity for structures under “exceptional” events. Since many years, the University of Liège is involved in different activities ... [more ▼]

Recent catastrophic events have pointed out the necessity of ensuring the integrity for structures under “exceptional” events. Since many years, the University of Liège is involved in different activities and projects mainly related to the robustness assessment of structures. The robustness of a structure is the capacity of the system to remain globally stable after events not directly ac- counted for in the design, like impact, fire or consequences of a human error, leading to a reason- able damage when compared to the original cause. Particular attention has been dedicated to the loss of column scenario with analytical and numerical investigations. As a contribution to differ- ent European projects (FREEDAM and ROBUSTIMPACT), experimental campaigns have been carried out or are currently undergoing, with the aim of understanding the behaviour of different joint typologies under impact loads. The experimental campaigns have the goal to underline the influence of the strain-rate of the joint components on the behaviour of the tested connections. In the present paper, an overview on the design criteria for the ongoing experimental campaign, on the preliminary results and findings is given and critically analysed. Particularly, an application in the field of the FREEDAM project is presented. [less ▲]

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See detailL’enjeu institutionnel - Le territoire de « Liège » en droit public belge
Behrendt, Christian ULiege; Pironnet, Quentin ULiege

in Demoulin, Bruno (Ed.) Histoire de Liège : Une cité, une capitale, une métropole (2017)

Chapitre de l'ouvrage "Histoire de Liège, Une cité, une capitale, une métropole", publié à l'occasion du bicentenaire de l'Université de Liège, sous la direction scientifique de Bruno Demoulin, et en ... [more ▼]

Chapitre de l'ouvrage "Histoire de Liège, Une cité, une capitale, une métropole", publié à l'occasion du bicentenaire de l'Université de Liège, sous la direction scientifique de Bruno Demoulin, et en coédition avec les Grandes Conférences Liégeoises [less ▲]

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See detailValidity and reliability of the French translation of the VISA-A questionnaire
Bruyère, Olivier ULiege; Kaux, Jean-François ULiege; Croisier, Jean-Louis ULiege

in European Journal of Sports Medicine (2017, September), 5(Supplement 1), 64

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See detailIs a Memoryless Motion Detection Truly Relevant for Background Generation with LaBGen?
Laugraud, Benjamin ULiege; Van Droogenbroeck, Marc ULiege

in Advanced Concepts for Intelligent Vision Systems (2017, September)

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a ... [more ▼]

The stationary background generation problem consists in generating a unique image representing the stationary background of a given video sequence. The LaBGen background generation method combines a pixel-wise median filter and a patch selection mechanism based on a motion detection performed by a background subtraction algorithm. In our previous works related to LaBGen, we have shown that, surprisingly, the frame difference algorithm provides the most effective motion detection on average. Compared to other background subtraction algorithms, it detects motion between two frames without relying on additional past frames, and is therefore memoryless. In this paper, we experimentally check whether the memoryless property is truly relevant for LaBGen, and whether the effective motion detection provided by the frame difference is not an isolated case. For this purpose, we introduce LaBGen-OF, a variant of LaBGen leverages memoryless dense optical flow algorithms for motion detection. Our experiments show that using a memoryless motion detector is an adequate choice for our background generation framework, and that LaBGen-OF outperforms LaBGen on the SBMnet dataset. We further provide an open-source C++ implementation of both methods at http://www.telecom.ulg.ac.be/labgen. [less ▲]

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See detailDifferentiating pre- and post-grazing pasture heights using a 3D camera: a prospective approach
Andriamandroso, Andriamasinoro ULiege; Castro Muñoz, Eloy ULiege; Blaise, Yannick ULiege et al

in Berckmans, Daniel; Keita, Alassane (Eds.) Precision Livestock Farming ‘17 (2017, September)

Grasslands management involves the monitoring of both animal and plant components. Recent precision livestock farming developments have focused on high-rate monitoring of grazing animals to enhance ... [more ▼]

Grasslands management involves the monitoring of both animal and plant components. Recent precision livestock farming developments have focused on high-rate monitoring of grazing animals to enhance livestock productivity and welfare. The evolution of grass resource during the grazing process is not being overlooked by graziers and researchers, but grass characteristics, such as height, dry matter content, productivity or density, are still measured using low frequency and sometimes destructive and time-consuming methods; such as quadrat, sward-sticks, rising plate meters. This study investigated the potential of using 3D cameras to assess sward physical characteristics. Main objectives were: (1) to define the correct way to capture images, particularly the camera position above the ground and, (2) to assess if differences in sward height were detectable. Couples of images differing in grass height were captured on the same spot with a 3D camera at different above-ground heights (30, 40, 50 cm) on a ryegrass-white clover pasture. Pregrazing height was 15cm and post-grazing sward was simulated by cutting at 2 cm. Histograms of intensity performed on greyscale images showed differences between pre- and post-grazing sward. As expected, overall darker pixels were observed for pre-grazing images (p<0.01) and whiter pixels for post-grazing images (p<0.01), indicating longer distances consistent with lower forage biomass. Images taken at a distance of 30 and 40 cm could identify these differences. Further developments require improving the calibration of the camera and developing image analysis method to estimate more plant characteristics such as density or dry matter content. [less ▲]

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See detailisokinetic profile of subjects with proximal patellar tendinopathy
Croisier, Jean-Louis ULiege; Libertiaux, Vincent ULiege; Kaux, Jean-François ULiege

in European Journal of Sports Medicine (2017, September), 5(Supplement 1), 65-66

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See detailLa normalisation européenne après l’arrêt James Elliott Construction du 27 octobre 2016 : la Cour de justice de l’Union européenne a-t-elle élargi ses compétences d’interprétation ?
Van Cleynenbreugel, Pieter ULiege; Demoulin, Iris ULiege

in Revue de la Faculté de Droit de l'Université de Liège (2017), (2),

Malgré son importance pratique, le processus de normalisation européenne a jusqu’à présent été relativement épargné par la Cour de justice. Toutefois, dans son arrêt James Elliott Construction du 27 ... [more ▼]

Malgré son importance pratique, le processus de normalisation européenne a jusqu’à présent été relativement épargné par la Cour de justice. Toutefois, dans son arrêt James Elliott Construction du 27 octobre 2016, la Cour s’est penchée directement sur le statut juridique des normes techniques européennes. Confirmant que l’interprétation des normes techniques harmonisées, actes non contraignantes, peut être soumise à un examen jurisprudentiel, la Cour a assimilé ces normes adoptées par des organismes privés à des actes des institutions de l’Union européenne. Cet article analyse les impacts de cet arrêt sur le cadre institutionnel de la normalisation européenne. Une telle analyse permettra de conclure que la Cour a interprété ses compétences d’interprétation extensivement afin de rendre possible plus directe son implication dans cette matière. [less ▲]

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See detailMéthodes de recherche qualitative
Lejeune, Christophe ULiege

Learning material (2017)

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See detailIntroduction au droit pénal et à la criminologie
Masset, Adrien ULiege

Learning material (2017)

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See detailPREVALENCE OF CERVICAL DYSFUNCTION IN PATIENTS WITH EPICONDYLALGIA: A PRELIMINARY STUDY
Colman, David ULiege; Demoulin, Christophe ULiege; Neumann, Valentin et al

Conference (2017, September)

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