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See detailFeasibility study of low-carbon ammonia and steel production in Europe
Hoxha, Jean-Luc ULiege; Caspar, Mathieu; Donceel, Alexis et al

in Eceee Industrial Summer Study Proceedings (in press)

As stipulated in the Paris Agreement, greenhouse gas emissions have to be reduced in order to maintain the global warming well below 2°C. Moreover, the European Union committed to become carbon neutral by ... [more ▼]

As stipulated in the Paris Agreement, greenhouse gas emissions have to be reduced in order to maintain the global warming well below 2°C. Moreover, the European Union committed to become carbon neutral by 2050. This will require shifting industrial production currently based on fossil energies towards the use of renewable energies. The present article considers two conceptual industrial processes that may operate in Europe with low carbon emissions through the use of green hydrogen. The studied processes are projections of the production of ammonia and steel in the 2030s. Hydrogen is assumed to be produced by water electrolysis with Proton Exchange Membrane electrolysers. The purpose of this paper being to evaluate the feasibility of such processes, it is assumed that the electricity required by the processes is entirely provided by renewable energies, in order to focus only on the challenges directly related to the ammonia and steelmaking plants. For the same reason, the prices are estimated in 2030 and not later, to avoid too uncertain costs assumptions, even if a complete supply by renewable energies may be unrealistic at that moment. Based on current industrial sectors of both ammonia and steel productions, a detailed modelling of the two decarbonised processes in Aspen Plus software is carried out and an economic analysis is also presented to prove the feasibility of these processes [less ▲]

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See detailThéâtre, tragédie et raison pure. Sur le §52 de la Critique de la faculté de juger de Kant
Dubouclez, Olivier ULiege

in Études de Lettres (in press)

Kant traite du théâtre à la fin de la première partie de la Critique de la faculté de juger (1790), dans le §52 qui est consacré à «l’association des beaux-arts». Il y met en lumière une double précarité ... [more ▼]

Kant traite du théâtre à la fin de la première partie de la Critique de la faculté de juger (1790), dans le §52 qui est consacré à «l’association des beaux-arts». Il y met en lumière une double précarité: celle du théâtre conçu comme éloquence (ce rapprochement le tirant du côté du simple divertissement) et celle de la tragédie, genre sublime, constamment menacée d’être réduite à une simple exaltation des forces vitales. Kant réfléchit alors sur les conditions historiques du surgissement du sentiment tragique: sa sublimité dépend en effet d’une double condition, subjective (du côté du spectateur comme sujet moral) et de l’artiste (en tant qu’il est capable de présenter l’infini), au sein d’un devenir culturel où s’accomplit la moralisation de l’être humain. [less ▲]

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See detailRegards sur la néologie wallonne aujourd’hui. État des lieux et questionnements pour aujourd’hui et pour demain
Balthazard, Matthieu ULiege

in Langues et Linguistique (in press)

We first present the Belgian-Romance linguistic situation (1), and then propose an overview of the four centers in which neologisms appear in Wallonia. In the two first instances, which we call in vivo ... [more ▼]

We first present the Belgian-Romance linguistic situation (1), and then propose an overview of the four centers in which neologisms appear in Wallonia. In the two first instances, which we call in vivo, neologisms are created by Walloon speakers and message writers. In the two last ones, which we call in vitro, the words are elaborated by the "refondeurs" of Walloon or created during subsidized contests dedicated to neologisms. In this overview, we describe these instances externally (general presentation, organization, media...) and internally (principles of lexical creation at work, etc.) (2). Finally, we examine the links between neology, survival of dialects and standardization. In a context of disappearance of dialects and in a perspective of preservation of these, neology drives us to think about standardization and the ideological and practical questions underlying it (3). [less ▲]

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See detailNégocier par gros temps. Pratique d’échanges entre la France et les Pays-Bas méridionaux aux marges du congrès de Westphalie (1648-1650)
Regibeau, Julien ULiege

in Enquêtes. revue de l’école doctorale « Histoire moderne et contemporaine » (in press)

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See detailI dipinti di Leonardo nella collezione reale francese nel XVII secolo
Fagnart, Laure ULiege

in Horti Hesperidum. Studi di storia del collezionismo e della storiografia artistica (in press)

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See detailLe “voile commun à tous meschans”. La justification de l’intolérance par la rhétorique du dévoilement dans la polémique catholique (France et Pays-Bas habsbourgeois, 1580–1594)
Goderniaux, Alexandre ULiege

in Loxias: Littératures Française et Comparées (in press)

This paper offers a comparative study of the polemical texts produced by the Catholic party in France and in the Southern Low Countries at the end of the 16th century. It focuses on the use of a specific ... [more ▼]

This paper offers a comparative study of the polemical texts produced by the Catholic party in France and in the Southern Low Countries at the end of the 16th century. It focuses on the use of a specific rhetoric strategy: the disclosure. In the case of France, this survey shows how this argument is linked to those of fear, war and truth within a deeply intolerant discourse which legitimizes a radical and intransigent hunt. Then, it studies how, on the contrary, the controversy produced in the Low Countries uses the rhetoric strategy of disclosure in a much more limited way, focused on the figure of a single enemy. [less ▲]

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See detailL'aventure cartésienne de la substance. Ego autem substantia dans l'ordre des raisons
Dubouclez, Olivier ULiege

in Revue Internationale de Philosophie (2020, December)

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See detailالمرأة العلويّة بين مطرقة الحرب و سندان الميديا
Kassab, Madeleine ULiege

in Al Kitab Journal for Human Sciences (2020, November), Special Issu

Since the protesting movements in several Arab countries erupted, the internet, especially the social media, has turned into a real war arena. A “Facebook revolution” or a “Twitter revolution” are terms ... [more ▼]

Since the protesting movements in several Arab countries erupted, the internet, especially the social media, has turned into a real war arena. A “Facebook revolution” or a “Twitter revolution” are terms that have been used to signify the role of this media in planning, organizing and reporting the peaceful protests and the armed conflicts live and instantaneously. The media blackout and the tight censorship on journalists are considered an important reason why the social media sites have become the first news source for many traditional media. The division of the Syrian society into supporters and opponents of the government and the president Bashar Al-Assad was clearly reflected in the interactive media which turned into platforms of swearing, threats and proudly displaying the images of the murdered people and hostages. The recipients of traditional media have become senders and receivers at the same time because of the social media. This has made them contribute to the process of spreading the propaganda of the camp to which they belong. They have rather become an essential contributor to the psychological war. The Syrian opposition attempted to confront the government and the president Al-Assad through media in different ways the most important of which is YouTube. The purpose of this qualitative-semiotic study is analyzing the image of the Alawite woman that is presented by some of Al-Assad opponents on YouTube in order to know how this woman is being used as a weapon in the psychological war. The importance of the research lies in uncovering the mental images which the opposition attempts to depict or reinforce about the Alawite woman in the context of a conflict in which sectarianism is considered one of its most prominent pillars; it is so at least for some of the fighting parties, and in a context where the peoples harvest the disasters which result from politicizing religion and religionizing politics. According to the results of the study, the Alawite woman has been considered a traitor of the Syrian people, murderer, kidnapper and sexual tool in the hand of the regime. The opponents have often linked the Alawite identity to the moral descent especially on the sexual level. [less ▲]

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See detailUnsupervised segmentation of indoor 3D point cloud: application to object-based classification
Poux, Florent ULiege; Mattes, Christian; Kobbelt, Leif

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2020, September 03), XLIV-4(W1-2020), 111-118

Abstract. Point cloud data of indoor scenes is primarily composed of planar-dominant elements. Automatic shape segmentation is thus valuable to avoid labour intensive labelling. This paper provides a ... [more ▼]

Abstract. Point cloud data of indoor scenes is primarily composed of planar-dominant elements. Automatic shape segmentation is thus valuable to avoid labour intensive labelling. This paper provides a fully unsupervised region growing segmentation approach for efficient clustering of massive 3D point clouds. Our contribution targets a low-level grouping beneficial to object-based classification. We argue that the use of relevant segments for object-based classification has the potential to perform better in terms of recognition accuracy, computing time and lowers the manual labelling time needed. However, fully unsupervised approaches are rare due to a lack of proper generalisation of user-defined parameters. We propose a self-learning heuristic process to define optimal parameters, and we validate our method on a large and richly annotated dataset (S3DIS) yielding 88.1\% average F1-score for object-based classification. It permits to automatically segment indoor point clouds with no prior knowledge at commercially viable performance and is the foundation for efficient indoor 3D modelling in cluttered point clouds. [less ▲]

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See detail3D Viewpoint Optimization of Topological Relationships: Application to 3D Cadastre for Visual Easement Validation
Neuville, Romain ULiege; Jacynthe, Pouliot; Billen, Roland ULiege

in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2020, September 03), VI-4/W1-2020

Offering optimum 3D viewpoint to user can be attractive in relieving occlusion in 3D scene. This could be much relevant for the visualization of 3D cadastral systems since they constitute complex datasets ... [more ▼]

Offering optimum 3D viewpoint to user can be attractive in relieving occlusion in 3D scene. This could be much relevant for the visualization of 3D cadastral systems since they constitute complex datasets including both physical and legal objects while users are operating a number of visual tasks that require precise outlook. However, 3D viewpoint usability has yet to be evaluated to demonstrate its relevance in accomplishing given end user’s visual tasks. Hence, in this research project, the focus is set on visual identification of 3D topological relationships (disjoint and overlap) as it is one of the main users’ requirements in 3D cadastre. To this end, this paper addresses this issue using a virtual 3D model of the Planetarium Rio Tinto Alcan (Montreal city) in which property issues take place, especially regarding the easement validation procedure. Empirical tests have then been administrated in the form of interviews using an online questionnaire with university students who will specifically address such issues in their professional career. The results show that a 3D viewpoint that maximizes 3D disjoined or overlapped geometric objects’ view area within the viewport significantly outperforms traditional combined software points of view in visually identifying 3D topological relationship. This paper also suggests that user’s inexperience in 3D cadastre reduces visual task efficiency when visually identifying 3D topological relationship among overlapped geometric objects. Eventually, this study opens up new perspectives on 3D topological relationships modeling and visualization. [less ▲]

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See detailSELF-LEARNING ONTOLOGY FOR INSTANCE SEGMENTATION OF 3D INDOOR POINT CLOUD
Poux, Florent ULiege; Ponciano, Jean-Jacques

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2020, August 12), XLIII(B2), 309316

Automation in point cloud data processing is central for efficient knowledge discovery. In this paper, we propose an instance segmentation framework for indoor buildings datasets. The process is built on ... [more ▼]

Automation in point cloud data processing is central for efficient knowledge discovery. In this paper, we propose an instance segmentation framework for indoor buildings datasets. The process is built on an unsupervised segmentation followed by an ontology-based classification reinforced by self-learning. We use both shape-based features that only leverages the raw X, Y, Z attributes as well as relationship and topology between voxel entities to obtain a 3D structural connectivity feature describing the point cloud. These are then used through a planar-based unsupervised segmentation to create relevant clusters constituting the input of the ontology of classification. Guided by semantic descriptions, the object characteristics are modelled in an ontology through OWL2 and SPARQL to permit structural elements classification in an interoperable fashion. The process benefits from a self-learning procedure that improves the object description iteratively in a fully autonomous fashion. Finally, we benchmark the approach against several deep-learning methods on the S3DIS dataset. We highlight full automation, good performances, easy-integration and a precision of 99.99% for planar-dominant classes outperforming state-of-the-art deep learning. [less ▲]

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See detailMARKER-LESS MOBILE AUGMENTED REALITY APPLICATION FOR MASSIVE 3D POINT CLOUDS AND SEMANTICS
Kharroubi, Abderrazzaq ULiege; Billen, Roland ULiege; Poux, Florent ULiege

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2020, August 12), XLIII(B2), 255261

Mobile Augmented Reality (MAR) attracts significant research and development efforts from both the industry and academia, but rarely integrate massive 3D dataset’s interactions. The emergence of dedicated ... [more ▼]

Mobile Augmented Reality (MAR) attracts significant research and development efforts from both the industry and academia, but rarely integrate massive 3D dataset’s interactions. The emergence of dedicated AR devices and powerful Software Development Kit (ARCore for android and ARKit for iOS) improves performance on mobile devices (Smartphones and tablets). This is aided by new sensor integration and advances in computer vision that fuels the development of MAR. In this paper, we propose a direct integration of massive 3D point clouds with semantics in a web-based marker-less mobile Augmented Reality (AR) application for real-time visualization. We specifically investigate challenges linked to point cloud data structure and semantic injection. Our solution consolidates some of the overarching principles of AR, of which pose estimation, registration and 3D tracking. The developed AR system is tested on mobile phones web-browsers providing clear insights on the performance of the system. Promising results highlight a number of frame per second varying between 27 and 60 for a real-time point budget of 4.3 million points. The point cloud tested is composed of 29 million points and shows how our indexation strategy permits the integration of massive point clouds aiming at the point budget. The results also gives research directions concerning the dependence and delay related to the quality of the network connection, and the battery consumption since portable sensors are used all the time. [less ▲]

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See detailAutomatic 3D Buildings Compact Reconstruction from LiDAR point clouds
Nys, Gilles-Antoine ULiege; Billen, Roland ULiege; Poux, Florent ULiege

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2020, August 12), (XLIII-B2-2020), 473-478

Point clouds generated from aerial LiDAR and photogrammetric techniques are great ways to obtain valuable spatial insights over large scale. However, their nature hinders the direct extraction and sharing ... [more ▼]

Point clouds generated from aerial LiDAR and photogrammetric techniques are great ways to obtain valuable spatial insights over large scale. However, their nature hinders the direct extraction and sharing of underlying information. The generation of consistent large-scale 3D city models from this real-world data is a major challenge. Specifically, the integration in workflows usable by decision-making scenarios demands that the data is structured, rich and exchangeable. CityGML permits new advances in terms of interoperable endeavour to use city models in a collaborative way. Efforts have led to render good-looking digital twins of cities but few of them take into account their potential use in finite elements simulations (wind, floods, heat radiation model, etc.). In this paper, we target the automatic reconstruction of consistent 3D city buildings highlighting closed solids, coherent surface junctions, perfect snapping of vertices, etc. It specifically investigates the topological and geometrical consistency of generated models from aerial LiDAR point cloud, formatted following the CityJSON specifications. These models are then usable to store relevant information and provides geometries usable within complex computations such as computational fluid dynamics, free of local inconsistencies (e.g. holes and unclosed solids). [less ▲]

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See detailPower Factor Improvement by Active Distribution Networks During Voltage Emergency Situations
Pabon Ospina, Luis David; Van Cutsem, Thierry ULiege

in Electric Power Systems Research (2020, August)

As more Distributed Generation Units (DGUs) are integrated into medium–voltage grids, the interaction between transmission and distribution networks plays a higher role in power system security. The ... [more ▼]

As more Distributed Generation Units (DGUs) are integrated into medium–voltage grids, the interaction between transmission and distribution networks plays a higher role in power system security. The contribution of the so-called Active Distribution Networks (ADNs) to system stability is expected to become more and more significant. This paper focuses on long-term voltage stability issues and shows that, contrary to what might be expected, a mere reactive power injection by DGUs has detrimental effects on system stability and might bring along counterproductive effects that precipitate voltage instability and collapse. Hence, an alternative control scheme for power factor improvement by ADNs during voltage emergency situations is proposed. The power factor is measured at the point of common coupling between transmission and distribution networks. The controller enhances system stability and eliminates the identified counterproductive effects. The conclusions are derived from time-domain simulations of a very simple, but concept-friendly, 5-bus system. [less ▲]

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See detailHepatitis E virus genotype 3 subtype dependent clinical outcomes in Belgium 2010-2018
Peeters, M; De Somer, T; Klamer, S et al

in Journal of Hepatology (2020, August), 73

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See detailEarly liver transplantation for severe alcoholic hepatitis not responding to medical treatment: results of the French-Belgian prospective study QuickTrans
Louvet, A; Labreuche, J; Moreno, C et al

in Journal of Hepatology (2020, August), 73

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See detailEfficacy and safety of an intra-articular injection of JTA-004, a novel enhanced protein solution, in knee osteoarthritis pain: a randomized, double-blind controlled phase II/III study
Bettonville, M; Leon, M; Margaux, J et al

in Annals of the Rheumatic Diseases (2020, June), 79(Supplement 1), 798

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See detailMultimodal and multiview distillation for real-time player detection on a football field
Cioppa, Anthony ULiege; Deliège, Adrien ULiege; Noor, Ul Huda et al

in IEEE Conference on Computer Vision and Pattern Recognition. Proceedings (2020, June)

Monitoring the occupancy of public sports facilities is essential to assess their use and to motivate their construction in new places. In the case of a football field, the area to cover is large, thus ... [more ▼]

Monitoring the occupancy of public sports facilities is essential to assess their use and to motivate their construction in new places. In the case of a football field, the area to cover is large, thus several regular cameras should be used, which makes the setup expensive and complex. As an alternative, we developed a system that detects players from a unique cheap and wide-angle fisheye camera assisted by a single narrow-angle thermal camera. In this work, we train a network in a knowledge distillation approach in which the student and the teacher have different modalities and a different view of the same scene. In particular, we design a custom data augmentation combined with a motion detection algorithm to handle the training in the region of the fisheye camera not covered by the thermal one. We show that our solution is effective in detecting players on the whole field filmed by the fisheye camera. We evaluate it quantitatively and qualitatively in the case of an online distillation, where the student detects players in real time while being continuously adapted to the latest video conditions. [less ▲]

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See detailConsensus statement on intra-articular injections of platelet-rich plasma for the management of knee osteoarthritis
Eymard, F; Ornetti, P; Maillet, J et al

in Annals of the Rheumatic Diseases (2020, June), 79(Supplement 1), 1738

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See detailA Context-Aware Loss Function for Action Spotting in Soccer Videos
Cioppa, Anthony ULiege; Deliège, Adrien ULiege; Giancola, Silvio et al

in IEEE Conference on Computer Vision and Pattern Recognition. Proceedings (2020, June)

In video understanding, action spotting consists in temporally localizing human-induced events annotated with single timestamps. In this paper, we propose a novel loss function that specifically considers ... [more ▼]

In video understanding, action spotting consists in temporally localizing human-induced events annotated with single timestamps. In this paper, we propose a novel loss function that specifically considers the temporal context naturally present around each action, rather than focusing on the single annotated frame to spot. We benchmark our loss on a large dataset of soccer videos, SoccerNet, and achieve an improvement of 12.8% over the baseline. We show the generalization capability of our loss for generic activity proposals and detection on ActivityNet, by spotting the beginning and the end of each activity. Furthermore, we provide an extended ablation study and display challenging cases for action spotting in soccer videos. Finally, we qualitatively illustrate how our loss induces a precise temporal understanding of actions and show how such semantic knowledge can be used for automatic highlights generation. [less ▲]

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See detailHow to represent 3D Data?
Poux, Florent ULiege

in Towards Data Science (2020, May 11)

The 3D datasets in our computerized ecosystem — of which an increasing number comes directly from reality capture devices — are found in different forms that vary in both the structure and the properties ... [more ▼]

The 3D datasets in our computerized ecosystem — of which an increasing number comes directly from reality capture devices — are found in different forms that vary in both the structure and the properties. Interestingly, they can be somehow mapped with success to point clouds thanks to its canonical nature. This article gives you the main 3D data representations modes to choose from when bindings point clouds to your application [less ▲]

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See detail« Leurs propos le tesmoignent assez » Le discours rapporté par voie épistolaire, arme de la Ligue catholique parisienne (1585-1594)
Goderniaux, Alexandre ULiege

in Ouvroir Litt&Arts (2020, May), 13

De 1585 à 1594, la Ligue parisienne imprime près d’une centaine de lettres rapportant les propos de nombreux acteurs dans des situations d’élocutions particulièrement protéiformes. Cette enquête étudie ... [more ▼]

De 1585 à 1594, la Ligue parisienne imprime près d’une centaine de lettres rapportant les propos de nombreux acteurs dans des situations d’élocutions particulièrement protéiformes. Cette enquête étudie les pratiques discursives par lesquelles le discours rapporté en contexte épistolaire a été instrumentalisé par les ultra-catholiques dans le cadre de cette guerre des libelles. Recourant largement à l’étude de cas, elle analyse comment les libellistes ont concrètement fait participer la citation des propos d’autrui à un vaste système discursif, notamment via la mise en scène de son origine et de son inclusion dans un échange privé, via son interprétation comme témoignage à charge contre les ennemis des catholiques, ou encore via des éléments de réflexion émis par les polémistes à propos du discours lui-même. Ce faisant, elle met en lumière la diversité des pratiques auxquelles les libellistes ligueurs ont recours afin de faire du discours en contexte épistolaire un argument au service de leurs revendications politiques. [less ▲]

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See detailMicrostructure and properties of SLM AlSi10Mg: Understanding the influence of the local thermal history
Mertens, Anne ULiege; Delahaye, Jocelyn ULiege; Dedry, Olivier ULiege et al

in Procedia Manufacturing (2020, April 26), 47

Selective Laser Melting (SLM) is an Additive Manufacturing technique that is widely used to produce AlSi10Mg parts with a good strength-to-weight ratio. Indeed, strongly refined microstructures are ... [more ▼]

Selective Laser Melting (SLM) is an Additive Manufacturing technique that is widely used to produce AlSi10Mg parts with a good strength-to-weight ratio. Indeed, strongly refined microstructures are obtained due to the ultra-fast cooling rates reached in this process, conferring high strength to the parts, even in the as-built state. However, microstructural heterogeneities at the scale of the melt pool may exert a detrimental influence on the mechanical properties e.g. by causing a loss in ductility. This study thus aims at a better understanding of the influence of the local thermal history on local variations of microstructure and mechanical properties. Microscopy (i.e. SEM+EDS) and nanoindentation have been combined to reach a detailed knowledge of the local microstructure and properties. In particular, the solute Si content in the -Al matrix, the volume fraction and the size of Si precipitates have been quantified by microscopy analysis. These local microstructural parameters are correlated with the matrix hardness as revealed by nanoindentation. Finally, the results of this detailed characterization are linked with the local thermal history that is approached in two different ways i.e. (i) an analytical description of thermal gradients inside the melt pool based on Rosenthal’s and Matyja’s equations and (ii) a simple Finite Element model for the deposition of a few layers in the SLM process. [less ▲]

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See detailThermal Analysis of Solidifying Steel Shell in Continuous Casting Process
Tran, Hoang Son ULiege; Castiaux, Etienne; Habraken, Anne ULiege

in Procedia Manufacturing (2020, April), 47

A finite element simulation of the steel shell formation in continuous casting has been developed. The current research is focused on the solidification of molten steel during the initial stages of the ... [more ▼]

A finite element simulation of the steel shell formation in continuous casting has been developed. The current research is focused on the solidification of molten steel during the initial stages of the mould cooling. The model allows predicting the temperature field throughout the process: temperature gradient, solidification front, cooling rates. In stationary state, the prediction of shell thickness reasonably agrees with analytical models and experimental observations. The simulation tool is used to study the alteration of the mould thermal field in case of sticking defects encountered in industrial practice. A numerical analysis increases the understanding of the phenomena. [less ▲]

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See detailAn oleuropein-based dietary supplement improves joint functionality in older people with high knee joint pain
Horcajada, M-N; Beaumont, M; Sauvageot, N et al

in Osteoarthritis and Cartilage (2020, April), 28(Suppl 1), 472-3

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See detailA multicomponent medication promotes chondrogenesis and reduces MMP-13 in primary articular chondrocytes from knee osteoarthritis patients in vitro
Sanchez, Christelle ULiege; Hemmer, Kathrin; Krommelbein, Natascha et al

in Osteoarthritis and Cartilage (2020, April), 28(Suppl 1), 106-107

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See detailBoswellia serrata extract and curcumin increase GDF15 production by human primary osteoarthritis chondrocytes: a new mechanism of action
Sanchez, Christelle ULiege; Zappia, Jérémie ULiege; Dierckxsens, Yvan et al

in Osteoarthritis and Cartilage (2020, April), 28(Suppl 1), 120

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See detailCartilage biomarkers S-COLL2-1 and S-COLL2-1NO2 are helpful in identifying knee osteoarthritis patients at risk of disease worsening
Henrotin, Yves ULiege; Hick, Anne-Christine; Labasse, Alain et al

in Osteoarthritis and Cartilage (2020, April), 28(Suppl 1), 327-28

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See detailUn oratoire du Xe siècle sur le site du Rocher du Vieux-Château à Pont-de-Bonne (Lg)
Delye, Emmanuel ULiege; Wymmersch, Guillaume ULiege

in Archaeologia Mediaevalis. Archéologie du Moyen Âge et de Temps Modernes dans les trois régions belges et les pays limitrophes (2020, March 13), 43

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See detailHepatitis E virus genotype 3 subtype dependent clinical outcomes in Belgium 2010-2018
De Somer, T; Peeters, M; Klamer, S et al

in Acta Gastro-Enterologica Belgica (2020, March), 83(1), 12

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See detailApsidal motion in the massive binary HD 152248
Rosu, Sophie ULiege; Rauw, Grégor ULiege; Gosset, Eric ULiege et al

in Contributions of the Astronomical Observatory Skalnaté Pleso (2020, March), 50(2), 624-626

The eccentric massive binary HD 152248, hosting two very similar O7.5 III(f) stars, is the most emblematic eclipsing O-star binary in the very young and rich open cluster NGC 6231. Measuring the rate of ... [more ▼]

The eccentric massive binary HD 152248, hosting two very similar O7.5 III(f) stars, is the most emblematic eclipsing O-star binary in the very young and rich open cluster NGC 6231. Measuring the rate of apsidal motion in such a binary system gives insight into the internal structure and evolutionary state of the stars composing it. [less ▲]

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See detailFirst steps towards online Personal Dosimetry Using Computational Methods in Interventional Radiology: operator’s position tracking and simulation input generation
Abdelrahman, Mahmoud Eid Mahmoud ULiege; Lombardo, Pasquale; Vanhavere, Filip et al

in Radiation Physics and Chemistry (2020, January 16)

Introduction <br />With this work we present an innovative system for calculating occupational doses, as it is now being developed within the PODIUM (Personal Online DosImetry Using computational Methods ... [more ▼]

Introduction <br />With this work we present an innovative system for calculating occupational doses, as it is now being developed within the PODIUM (Personal Online DosImetry Using computational Methods) project. Individual monitoring of workers is essential to follow up regulatory dose limits and to apply the ALARA principle. However, current personal dosimeters are subject to large uncertainties, especially in non-homogeneous fields, like those found interventional radiology/cardiology. Workers in these fields also need to wear several dosimeters (extremity, eye lens, above/below apron), which causes practical problems. As the capabilities of computational methods are increasing exponentially, it will become feasible to use pure computations to calculate doses in place of physical dosimeters. <br /> <br />Methods <br />In our concept system, operational and protection quantities are calculated by fast Monte Carlo methods. Our dose calculation accounts for the real radiation field (including fluence, energy and angular distributions) and for the relative position of different body parts of the worker. The real movements of exposed workers are captured using depth cameras. This information is translated to a flexible anthropomorphic phantom, and then in Monte-Carlo simulations. For the moment this is done off-line, after the procedure is finished, and the parameters of the procedure are collected. <br /> <br />Results <br />For validating our system, we performed tests in interventional radiology (IR) rooms. In total, we followed 15 procedures in Cath-labs at UZ-VUB and CHU- Liège. An accurate analysis of the staff position was performed, and as a first step, we compared simulated Hp(10) and measured Hp(10) with electronic personal dosimeter (EPD) during an angiography procedure for some of these procedures. The results showed good agreement between the calculated doses and the ones measured by the EPD dosimeter. <br /> <br />Conclusions <br />With this work, we show that simulating worker doses based on tracking systems and flexible phantoms is possible. This method has big advantages in interventional radiology workplaces where the fields are non-homogeneous and doses to staff can be relatively high. This method can also help in ALARA applications and for education and training. [less ▲]

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See detailRECYCLING FINE PARTICLES FROM CONSTRUCTION AND DEMOLITION WASTES: CHARACTERIZATION AND EFFECTS ON CONCRETE PERFORMANCES
Courard, Luc ULiege; Bouarroudj, El Karim Mohamed ULiege; Colman, Charlotte ULiege et al

in International Journal of Minerals, Metallurgy and Materials (2020)

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See detailMachine Learning for Ranking Day-ahead Decisions in the Context of Short-term Operation Planning
Duchesne, Laurine ULiege; Karangelos, Efthymios ULiege; Sutera, Antonio ULiege et al

in Electric Power Systems Research (2020)

In operation planning, probabilistic reliability assessment consists in evaluating, for various candidate planning decisions, the induced probability of meeting a reliability target and the expected ... [more ▼]

In operation planning, probabilistic reliability assessment consists in evaluating, for various candidate planning decisions, the induced probability of meeting a reliability target and the expected operating cost over a certain future time period. In this paper, we propose to exploit Monte-Carlo simulation and machine learning to predict operation costs for various day-ahead unit commitment and economic dispatch decisions and a range of realisations of uncertain loads and renewable generations over the next day. We describe how to generate a database, how to apply supervised machine learning to it, and how to use the learnt proxies to rank candidate day-ahead decisions in terms of the expected operating cost they induce over the next day. We illustrate the approach on the IEEE-RTS96 benchmark where we use the DC power-flow approximation and the N-1 criterion to simulate real-time operation and to generate generation schedules in the day-ahead operation planning stage. [less ▲]

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See detailFundamentals of Power Systems Modelling in the Presence of Converter-Interfaced Generation
Paolone, Mario; Gaunt, Trevor; Guillaud, Xavier et al

in Electric Power Systems Research (2020)

This survey paper discusses the fundamentals of power systems modelling in the presence of large amounts of converter-interfaced generation (CIG). By referring to real-life events characterised by ... [more ▼]

This survey paper discusses the fundamentals of power systems modelling in the presence of large amounts of converter-interfaced generation (CIG). By referring to real-life events characterised by anomalous dynamics associated to the presence of CIG, the concepts of narrow versus broad band signals are first recalled along with the limitation of the meaning of apparent power, power factor and reactive power. In this regard, the adequacy of the phasor representation of voltages and currents waveforms is thoroughly discussed. Then, with respect to the central subject of control of power converters, a revised definition of grid-following and grid-forming converters is provided along with a thorough discussion of their associated controls and a comprehensive classification for both classes of converters. Several applications inspired by actual case studies are included in the paper in order to provide realistic application examples. [less ▲]

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See detailProduction of Hypernuclei and Strange Particles in Spallation Reactions at a Few GeV Using an Intranuclear Cascade Approach
David, Jean-Christophe; Hirtz, Jason; Rodríguez-Sánchez, Jose Luis et al

in Springer Proceedings in Physics (2020), 238

Motivated by a renewed interest in studies of hypernuclei, the strangeness degree of freedom was implemented in the intranuclear cascade model INCL. This model takes care of the first stage of reactions ... [more ▼]

Motivated by a renewed interest in studies of hypernuclei, the strangeness degree of freedom was implemented in the intranuclear cascade model INCL. This model takes care of the first stage of reactions between a nucleon (or a light cluster) and a nucleus at energies from a few tens of MeV up to a few GeV. After emission of fast particles, a hot remnant nucleus is produced and another model, combined to INCL, handles the de-excitation (Abla in our case). The main ingredients are discussed and we compare the results to experimental data. © Springer Nature Switzerland AG 2020. [less ▲]

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See detailCoordination of operational planning and real-time optimization in microgrids
Dumas, Jonathan ULiege; Dakir, Selmane ULiege; Liu, Clement et al

in Electric Power Systems Research (2020)

Hierarchical microgrid control levels range from distributed device level controllers that run at a high frequency to centralized controllers optimizing market integration that run much less frequently ... [more ▼]

Hierarchical microgrid control levels range from distributed device level controllers that run at a high frequency to centralized controllers optimizing market integration that run much less frequently. Centralized controllers are often subdivided in operational planning controllers that optimize decisions over a time horizon of one or several days, and real-time optimization controllers that deal with actions in the current market period. The coordination of these levels is of paramount importance. In this paper we propose a value function based approach as a way to propagate information from operational planning to real-time optimization. We apply this method to an environment where operational planning, using day-ahead forecasts, optimizes at a market period resolution the decisions to minimize the total energy cost and revenues, the peak consumption and injection related costs, and plans for reserve requirements. While real-time optimization copes with the forecast errors and yields implementable actions based on real-time measurements. The approach is compared to a rule-based controller on three use cases, and its sensitivity to forecast error is assessed. [less ▲]

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See detailChallenging construction industry with C&DW: opportunities and limits
Courard, Luc ULiege; Zhao, Zengfeng ULiege; Hubert, Julien ULiege

in AATH (2020)

Construction and Demolition Waste (C&DW) comprises the largest waste stream in the European Union (EU), with relatively stable amounts produced over time and high recovery rates: it is estimated at one ... [more ▼]

Construction and Demolition Waste (C&DW) comprises the largest waste stream in the European Union (EU), with relatively stable amounts produced over time and high recovery rates: it is estimated at one third of total wastes generated in the EU. Although this may suggest that the construction sector is highly circular, scrutiny of waste management practices reveals that C&DW recovery is largely based on backfilling operations and low-grade recovery, such as using recycled aggregates in road sub-bases. These wastes are usually recovered as secondary raw materials after a recycling process resulting in the production of recycled sands and aggregates. Researches have been performed to show how it is possible to encourage and support the use of these recycled materials: preparation process and selection are fundamental for increasing capability of recycling. Analysis of recycled bricks and tiles sands and fine particles has also been tested as substitution product in concrete design. A quantitative analysis is proposed for five North West European (NWE) countries: Belgium, France, Germany, Luxembourg and the Netherlands, where barriers are pointed out. The construction industry will be definitively affected by C&DW recycling for promoting circular economy in the coming years. [less ▲]

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See detailTowards leveraging discrete grid flexibility in chance-constrained power system operation planning
Karangelos, Efthymios ULiege; Wehenkel, Louis ULiege

in Electric Power Systems Research (2020)

This paper considers the integration of grid flexibility in the chance-constrained power system operation planning framework. The particular challenge addressed comes from the discrete nature of the ... [more ▼]

This paper considers the integration of grid flexibility in the chance-constrained power system operation planning framework. The particular challenge addressed comes from the discrete nature of the respective controls, such as breaker positions defining the topology of the network. We consider a template short-term operation planning problem statement, seeking to enable N-1 secure operation over a distribution of power injections. We use a scenario-based approach to determine a planning decision and rely on theoretical results to compute an upper bound on the probability of being able to meet the N-1 criterion in operation. We also estimate the actual value of this probability through Monte Carlo simulation. Our results indicate that both the bound and the actual value consistently decrease when increasing the size of the considered scenario set, even if the bound is quite conservative. Moreover, we showcase that further from economic efficiency, grid flexibility can lead to gains in operational reliability. [less ▲]

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See detailAvoiding 5/4-powers on the alphabet of nonnegative integers (extended abstract)
Rowland, Eric; Stipulanti, Manon ULiege

in Lecture Notes in Computer Science (2020), 12086

We identify the structure of the lexicographically least word avoiding 5/4-powers on the alphabet of nonnegative integers.

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See detailL’atelier des tailleurs de pierres sur le chantier de restauration de la collégiale Sainte-Croix à Liège au XIXe siècle : organisation et aspects socio-économiques (1845-1859)
Baudry, Antoine ULiege

in Études et Documents du Cercle Royal d'Histoire et d'Archéologie d'Ath et de la Région (2020), XXXI

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See detailDeposition and study of N-In co-doped sol-gel ZnO films
Ivanova, T.; Harizanova, A.; Koutzarova, T. et al

in Journal of Physics: Conference Series (2020), 1492

Single and doped ZnO films are successfully deposited by a sol-gel method. ZnO:N, ZnO:In and co-doped (N, In) ZnO films are thermally treated at 300 -C and 600 C. Their structural, vibrational and optical ... [more ▼]

Single and doped ZnO films are successfully deposited by a sol-gel method. ZnO:N, ZnO:In and co-doped (N, In) ZnO films are thermally treated at 300 -C and 600 C. Their structural, vibrational and optical properties are studied. The ZnO:In:N films crystallize in a wurtzite phase, revealing a preferential orientation in the 002 plane. FTIR analysis shows that the two dopants affect greatly the shapes and positions of the absorption features. The ZnO:N:In films are highly transparent above 90% in the visible spectral range. The ZnO:In and ZnO:N:In films annealed at 400-600C show a tendency of narrowing the optical band gap compared to ZnO. © 2020 IOP Publishing Ltd. All rights reserved. [less ▲]

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See detailStructural study of thick hexaferrite films
Koutzarova, T.; Georgieva, B.; Kolev, S. et al

in Journal of Physics: Conference Series (2020), 1492

We present details of the microstructural properties of Y- (Ba2Mg2Fe12O22, Ba0.5Sr1.5Zn2Fe12O22, Ba0.5Sr1.5Zn2Al0.08Fe11.92O22) and Z-type (Sr3Co2Fe24O41) hexaferrite thick films deposited by screen ... [more ▼]

We present details of the microstructural properties of Y- (Ba2Mg2Fe12O22, Ba0.5Sr1.5Zn2Fe12O22, Ba0.5Sr1.5Zn2Al0.08Fe11.92O22) and Z-type (Sr3Co2Fe24O41) hexaferrite thick films deposited by screen printing and drop casting on unpolished polycrystalline Al2O3 substrates. The hexaferrites thick films obtained by drop casting exhibited considerable roughness and porousness compared with those obtained by screen printing. We found that the powders' morphology significantly affects the microstructure of the thick films formed by screen printing. The microstructural analysis of the thick films shows that their microstructure differs from that of the powders. Further, during the annealing process the grains in the thick films grow and form hexagonal particles, the latter having the largest size, best shape and being best observed in the case of the Ba2Mg2Fe12O22 film. © 2020 IOP Publishing Ltd. All rights reserved. [less ▲]

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See detailElectrochromic and optical study of sol-gel TiO2-MnO films
Ivanova, T.; Harizanova, A.; Koutzarova, T. et al

in Journal of Physics: Conference Series (2020), 1492

We present a study on the structural, optical and electrochromic properties of sol-gel films of TiO2 and TiO2-MnO. The XRD analyses show that the incorporation of Mn in the TiO2 host matrix inhibits the ... [more ▼]

We present a study on the structural, optical and electrochromic properties of sol-gel films of TiO2 and TiO2-MnO. The XRD analyses show that the incorporation of Mn in the TiO2 host matrix inhibits the crystallization process, as compared to single TiO2 films, which are well crystallized in anatase phase. This conclusion is supported by FTIR analysis. Adding Mn to the TiO2 films leads to a significant narrowing of the optical band gap. The electrochromic characteristics of TiO2-MnO films are better than those of the single titanium dioxide films after annealing at 300 C. © 2020 IOP Publishing Ltd. All rights reserved. [less ▲]

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See detailHyperdeep : deep learning descriptif pour l’analyse de données textuelles
Vanni, Laurent; Corneli, Marco; Longrée, Dominique ULiege et al

in Lexicometrica (2020)

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See detail2D thermal finite element analysis of sticker breakout in continuous casting.
Tran, Hoang Son ULiege; Castiaux, Etienne; Habraken, Anne ULiege

in Procedia Manufacturing (2020)

The sticker breakout is an accident in continuous casting which could frequently occur without a correct process monitoring. The breakout of the sticker has become one of the main factors limiting the ... [more ▼]

The sticker breakout is an accident in continuous casting which could frequently occur without a correct process monitoring. The breakout of the sticker has become one of the main factors limiting the development of the continuous casting technology at high speed and wide-thick-plate. In this work, finite element models of the steel shell formation in continuous casting have been developed. The thermal parameters such as conductivity of mold, convection due to cooling system, thermal contact resistance were calibrated. The model allows to predict the temperature field throughout the process. The prediction of shell thickness reasonably agrees with experimental observations. Then, a 2D-thermal model of sticker breakout is established. The new algorithm allows for prediction of hot tearing due to sticking phenomena and its propagation. Current simulations are useful to define the model sensitivity and they increase the understanding of this phenomena. [less ▲]

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See detailL’Antiquité pour convaincre. L’histoire romaine dans les libelles de la Ligue parisienne (1585-1594) : rhétorique et circulation du savoir historique
Goderniaux, Alexandre ULiege

in Littératures Classiques (2020), 101(1), 95-106

At the twilight of the French wars of Religion, Parisian Catholics published nearly one thousand libels in which Roman history has regularly been employed as an argument. Adopting a resolutely concrete ... [more ▼]

At the twilight of the French wars of Religion, Parisian Catholics published nearly one thousand libels in which Roman history has regularly been employed as an argument. Adopting a resolutely concrete standpoint, this inquiry examines two mediations of Antiquity identifiable in these polemical texts: the practical discursive actions by which their authors have exploited the Roman past in order to plead the catholic case, and then the sources they used to gather this historical knowledge. [less ▲]

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See detailMethodology for 3D acquisition of highly reflective goldsmithing artefacts
Hallot, Pierre ULiege; Gil, Marc

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2019, December)

Abstract. The goldsmithing pieces conserved in museums are fragile objects whose accessibility for both research and mediation purposes lacks dematerialized systems for the safe handling of objects. The ... [more ▼]

Abstract. The goldsmithing pieces conserved in museums are fragile objects whose accessibility for both research and mediation purposes lacks dematerialized systems for the safe handling of objects. The research presented is part of the e-thesaurus project whose main objective is to improve the accessibility of masterpieces of goldsmithing - produced during the medieval period in the northern regions of France and today’s Belgium - both for research and mediation purposes. The methodology for 3D acquisition of objects with high levels of details and reflective properties must be further developed and affirmed in order provide controlled datasets that are suitable for researchers of the field and accurate for mediation application. The proposed project is the result of a collaboration between the IRHiS UMR CNRS of the University of Lille and the University of Liège. The proposed methodology leads to the 3D reconstruction of masterpieces of goldsmithing. The models developed serve as a basis for a mediation through holographic representation. They recently participated in an exhibition in the Treasure of the Cathedral of Liège museum. [less ▲]

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See detailTalking about the past: a way to stimulate episodic memory development in preschoolers
Léonard, Christina ULiege; Geurten, Marie ULiege; Willems, Sylvie ULiege

in Brain and Cognition (2019, December), 137

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See detailLe potentiel de la géothermie peu profonde dans la transition énergétique
Dassargues, Alain ULiege

in Bulletin de la Société Royale des Sciences de Liège (2019, November 29), 88(Actes de colloques), 52-63

Traditionnellement, seule la géothermie profonde était envisagée. Actuellement, les différentes formes de géothermies peu profondes et de faible enthalpie sont plus accessibles car elles présentent moins ... [more ▼]

Traditionnellement, seule la géothermie profonde était envisagée. Actuellement, les différentes formes de géothermies peu profondes et de faible enthalpie sont plus accessibles car elles présentent moins de risques financiers et environnementaux. Leur multiplication, notamment pour couvrir les besoins énergétiques de (gros ou nombreux) bâtiments, permet à ces systèmes de participer pleinement à la transition énergétique en cours. Ces systèmes géothermiques peu profonds ne requièrent aucune anomalie du gradient géothermique local. Néanmoins, lorsque des pompages et réinjections sont envisagés dans des aquifères peu profonds, les conditions hydrogéologiques influencent fortement l’efficacité (rendement) et la durabilité des systèmes installés mais aussi leur éventuel impact sur la quantité et la qualité des ressources en eaux souterraines. Les différents types de systèmes géothermiques peu profonds sont brièvement présentés, puis l’accent est mis sur les systèmes par doublets en aquifère et sur les anciennes mines. [less ▲]

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See detailSemantic enrichment of point cloud by automatic extraction and enhancement of 360° panoramas
Tabkha, A.; Hajji, R.; Billen, Roland ULiege et al

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2019, November 29), XLII-2(W17), 355-362

The raw nature of point clouds is an important challenge for their direct exploitation in architecture, engineering and construction applications. Particularly, their lack of semantics hinders their ... [more ▼]

The raw nature of point clouds is an important challenge for their direct exploitation in architecture, engineering and construction applications. Particularly, their lack of semantics hinders their utility for automatic workflows (Poux, 2019). In addition, the volume and the irregularity of the structure of point clouds makes it difficult to directly and automatically classify datasets efficiently, especially when compared to the state-of-the art 2D raster classification. Recently, with the advances in deep learning models such as convolutional neural networks (CNNs) , the performance of image-based classification of remote sensing scenes has improved considerably (Chen et al., 2018; Cheng et al., 2017). In this research, we examine a simple and innovative approach that represent large 3D point clouds through multiple 2D projections to leverage learning approaches based on 2D images. In other words, the approach in this study proposes an automatic process for extracting 360° panoramas, enhancing these to be able to leverage raster data to obtain domain-base semantic enrichment possibilities. Indeed, it is very important to obtain a rigorous characterization for use in the classification of a point cloud. Especially because there is a very large variety of 3D point cloud domain applications. In order to test the adequacy of the method and its potential for generalization, several tests were performed on different datasets. The developed semantic augmentation algorithm uses only the attributes X, Y, Z and camera positions as inputs. [less ▲]

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See detailCLASSIFICATION AND INTEGRATION OF MASSIVE 3D POINTS CLOUDS IN A VIRTUAL REALITY (VR) ENVIRONMENT
Kharroubi, Abderrazzaq ULiege; Hajji, Rafika; Billen, Roland ULiege et al

in International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2019, November 29), XLII-2(W17), 165-171

With the increasing volume of 3D applications using immersive technologies such as virtual, augmented and mixed reality, it is very interesting to create better ways to integrate unstructured 3D data such ... [more ▼]

With the increasing volume of 3D applications using immersive technologies such as virtual, augmented and mixed reality, it is very interesting to create better ways to integrate unstructured 3D data such as point clouds as a source of data. Indeed, this can lead to an efficient workflow from 3D capture to 3D immersive environment creation without the need to derive 3D model, and lengthy optimization pipelines. In this paper, the main focus is on the direct classification and integration of massive 3D point clouds in a virtual reality (VR) environment. The emphasis is put on leveraging open-source frameworks for an easy replication of the findings. First, we develop a semi-automatic segmentation approach to provide semantic descriptors (mainly classes) to groups of points. We then build an octree data structure leveraged through out-of-core algorithms to load in real time and continuously only the points that are in the VR user's field of view. Then, we provide an open-source solution using Unity with a user interface for VR point cloud interaction and visualisation. Finally, we provide a full semantic VR data integration enhanced through developed shaders for future spatio-semantic queries. We tested our approach on several datasets of which a point cloud composed of 2.3 billion points, representing the heritage site of the castle of Jehay (Belgium). The results underline the efficiency and performance of the solution for visualizing classifieds massive point clouds in virtual environments with more than 100 frame per second. [less ▲]

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See detailSurveillance à long terme de l’atmosphère terrestre à la station du Jungfraujoch
Mahieu, Emmanuel ULiege; Flock, Olivier ULiege; Notholt, Justus et al

in Bulletin de la Société Royale des Sciences de Liège (2019, November), 88

It is in the early 1950s that researchers from the University of Liège have recorded the first atmospheric solar spectra at the Jungfraujoch scientific station, in the Swiss Alps, at a time when climate ... [more ▼]

It is in the early 1950s that researchers from the University of Liège have recorded the first atmospheric solar spectra at the Jungfraujoch scientific station, in the Swiss Alps, at a time when climate change was not a matter of worry. These pioneering observations have allowed to confirm that methane and carbon monoxide were ubiquitous constituents of the Earth’s atmosphere. The recording of atmospheric spectra resumed in the mid-1970s, stimulated by rising concerns related to possible stratospheric ozone depletion. Since then, this monitoring activity has been conducted at that site without interruption, allowing to gather high-quality data crucial for the characterization of the Earth’s atmosphere and of the changes affecting it, resulting from anthropogenic activities or natural causes. In this paper, we present some recent results relevant for the verification of international environmental treaties. [less ▲]

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See detailEvaluating the Impact of User Story Quality on the Modelers Ability to Understand and Structure Requirements
Wautelet, Yves; Gielis, Dries; Poelmans, Stephan et al

in Lecture Notes in Business Information Processing (2019, November)

Scrum is essentially driven by user stories (US). The development team indeed uses, to fill the project and sprints’ content, sentences describing the user expectations w.r.t. the software. US are often ... [more ▼]

Scrum is essentially driven by user stories (US). The development team indeed uses, to fill the project and sprints’ content, sentences describing the user expectations w.r.t. the software. US are often written “on the fly” in structured natural language so their quality and the set’s consistency are not ensured. The Quality User Story (QUS) framework intends to evaluate and improve the quality of a given US set. Other research has built a unified model for tagging the elements of the WHO, WHAT and WHY dimensions of a US; each tag representing a concept with an inherent nature and granularity. Once tagged, the US elements of the set can be graphically represented through an icon and the modeler can link them when inter-dependencies are identified. One or more Rationale Trees (RT) are then built. This paper presents the result of an experiment conducted with novice modelers aimed to evaluate how well they are able to build a RT out of (i) a raw real-life US set (group 1) and (ii) a new version of the US set improved in quality using QUS (group 2). The experiment requires test subjects to identify the nature of US elements and to graphically represent and link them. The QUS compliant US set improved the ability of the test subjects to make this identification and linking. We cannot conclude that the use of the QUS framework improved the understanding the problem/solution domain but it increased the ability of modelers to identify Epic US. All in all, building an RT has a positive impact on identifying the structure of a US set’s functional elements. [less ▲]

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See detailInjections de Plasma Riche en Plaquettes dans la gonarthrose : recommandations pour la pratique clinique élaborées par un groupe d’experts internationaux
Eymard, Florent; Ornetti, Paul; Maillet, Jérémy et al

in Revue du Rhumatisme (2019, November), 86(S1),

Introduction La place des injections intra-articulaires de plasma riche en plaquettes (PRP) comme traitement symptomatique de la gonarthrose reste débattue malgré de nombreux essais randomisés contrôlés ... [more ▼]

Introduction La place des injections intra-articulaires de plasma riche en plaquettes (PRP) comme traitement symptomatique de la gonarthrose reste débattue malgré de nombreux essais randomisés contrôlés et plusieurs méta-analyses récentes. L'hétérogénéité des protocoles de préparation et d’injection limite aussi l'extrapolation de ces résultats. Ce consensus d’experts a pour objectif de formuler les premières recommandations de pratique clinique fondées sur une analyse systématique de la littérature et selon le processus Delphi. Méthodes Quinze médecins (10 rhumatologues, 4 spécialistes en médecine physique et médecine du sport et 1 radiologue interventionnel) de différents pays francophones ont été sélectionnés pour leur expertise dans les domaines du PRP et de l'arthrose, formant le GRIP (Groupe de Recherche sur les Injections de PRP). Un premier groupe de travail a été chargé d’effectuer une revue de la littérature exhaustive sur Medline intégrant les essais thérapeutiques, les études ouvertes et les méta-analyses portant sur les effets du PRP dans la gonarthrose. Vingt-cinq recommandations ont finalement été retenues après plusieurs réunions selon la méthode Delphi modifiée afin d’établir un consensus. En fonction de la valeur médiane et des scores extrêmes, les recommandations étaient jugées appropriées ou non, avec un accord fort ou relatif, ou incertaines en l'absence de consensus. Résultats Les principales recommandations sont listées ci-dessous: - les injections intra-articulaires de PRP au genou constituent un traitement symptomatique efficace de l’arthrose débutante à modérée. Médiane = 8 [6-9] - Approprié. Accord relatif ; - les injections intra-articulaires de PRP dans l’articulation du genou peuvent être utiles dans l’arthrose avec atteinte radiologique sévère (stade 4 de Kellgren et Lawrence). Médiane = 7 [6-7] - Approprié. Accord relatif ; - le traitement par PRP devrait être proposé en deuxième intention, après échec d’un traitement pharmacologique per os et/ou non pharmacologique de la gonarthrose. Médiane = 9 [5-9] - Approprié. Accord relatif ; - le traitement par PRP ne doit pas être pratiqué en phase congestive de la gonarthrose. Médiane = 7 [5-9] - Approprié. Accord relatif ; - une séquence de traitement par PRP dans la gonarthrose peut comporter 1 à 3 injections. Médiane = 9 [7-9] - Approprié. Accord fort ; - les PRP pauvres en leucocytes doivent être préférés dans la gonarthrose. Médiane = 8 [5-9] - Approprié. Accord relatif ; - les injections de PRP dans la gonarthrose devraient être pratiquées sous guidage échographique ou scopique. Médiane = 8 [3-9] - incertaine. Pas de consensus ; - les PRP ne devraient pas être mélangés à un anesthésique ou à un corticoïde intra-articulaire. Médiane = 9 [6-9] - Approprié. Accord relatif. Conclusion Vingt-cinq recommandations sur l’utilisation du PRP dans la gonarthrose ont été émises par un groupe d’experts multidisciplinaire international afin de standardiser les pratiques cliniques et les protocoles d’essais thérapeutiques à venir. [less ▲]

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See detailÉvaluation des qualités métrologiques du « Low back pain-related beliefs screening questionnaire (LBP-BSQ) »
Demoulin, Christophe ULiege; SALAMUN, Irène ULiege; Thierion, F. et al

in Revue du Rhumatisme (2019, November), 86(S1), 287-288

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See detailRevisiting the Product Configuration Systems Development Procedure for Scrum Compliance: An i* Driven Process Fragment
Wautelet, Yves; Shafiee, Sara; Heng, Samedi ULiege

in Lecture Notes in Computer Science (2019, November)

Product Configuration Systems (PCS) are software applications supporting the design of products tailored to the individual desiderata of customers. PCS development does not follow the same procedure as ... [more ▼]

Product Configuration Systems (PCS) are software applications supporting the design of products tailored to the individual desiderata of customers. PCS development does not follow the same procedure as traditional software: indeed, due to its nature, specific knowledge needs to be collected, a set of custom engineering stages have thus been built-up. Within these stages, special requirements representation and design artifacts are used notably to deal with features inter-dependencies. More specifically, the Product Variant Master (PVM) has been specifically created for PCS knowledge representation while ClassResponsibility-Collaboration (CRC) cards and a UML Class Diagram are often indispensable for PCS object-oriented design. PCS development projects have gradually started to use agile methods like the Scrum. This paper presents a process fragment for conducting PCS development projects with Scrum; it overviews how the development team of a specific organization adapted the agile process to the PCS context. This process fragment has indeed been built on the basis of practitioners knowledge collected through 5 qualitative interviews (inductive approach) and exhaustively depict the activities performed by the team on PCS development projects of various size and context. Because of the possibility to represent social (role) dependencies, the fragment is visually represented using an i* Strategic Rationale Diagram. The main contribution of the paper is the fragment itself, it is intended to be dynamically used as an initial guidance for PCS development teams willing to conduct projects using Scrum; it can be tailored to any project/sprint and enriched at will. [less ▲]

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See detailOn the requirement for a high resolution spectrograph to investigate the multiplicity of massive stars with the 3.6-m Devasthal Optical Telescope
De Becker, Michaël ULiege

in Bulletin de la Société Royale des Sciences de Liège (2019, October 31), 88

The investigation of the multiplicity of massive stars constitutes a key aspect of their understanding. On the one hand, the evolution of short period systems can be tremendously influenced by the ... [more ▼]

The investigation of the multiplicity of massive stars constitutes a key aspect of their understanding. On the one hand, the evolution of short period systems can be tremendously influenced by the companion, for instance through mass exchange or common envelope evolution. On the other hand, the wind-wind interaction region in massive multiple systems is the seat of a high level physics, including strong thermal X-ray emission, particle acceleration and non-thermal emission processes. The description and understanding of these processes require the accurate determination of orbital parameters, notably through spectroscopic studies. In this context, it is timely to anticipate some relevant applications of a high resolution spectrograph (HRS) to be mounted on the Devasthal Optical Telescope, emphasizing its potential complementarity with other Indian facilities such as the GMRT and Astrosat. [less ▲]

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See detailGMRT survey of Cygnus OB2 region
Ishwara-Chandra, C. H.; Benaglia, P.; De Becker, Michaël ULiege et al

in Bulletin de la Société Royale des Sciences de Liège (2019, October 31), 88

A good fraction of very high energy (VHE; > 100 GeV) sources do not have confirmed counterparts at any of the other branches of electromagnetc spectrum. In the extra-galactic sky, most of the VHE sources ... [more ▼]

A good fraction of very high energy (VHE; > 100 GeV) sources do not have confirmed counterparts at any of the other branches of electromagnetc spectrum. In the extra-galactic sky, most of the VHE sources with counter-parts are blazars, a sub-class of active galactic nuclei. However, VHE sources with identified counterparts in our Galaxy do have a wide range of categories, ranging such as supernovae remnants, colliding wind binaries, pulsar wind nebulae, micro-quasars, etc. The VHE emission and radio emission due to synchrotron process do occur from the same population of relativistic electrons in several type of sources, so the radio band is the first band to search for possible counterparts to unidentified VHE sources. In addition, the radio spectral index also gives important constraints on compactness and energetics of the electron population. In this work we present a two-frequency radio survey, at frequencies 325 MHz and 610 MHz, of the Cygnus OB2 region with the Giant Metrewave Radio Telescope (GMRT) in order to address several astrophysical problems. The survey covers a wide area (̃ 5 square degrees) at sub-mJy sensitivity which helps to discover faint radio sources to several objects for the first time. Also this is the first deep wide area radio survey of the region below 1.4 GHz, and the low radio frequency will preferentially pickup more non-thermal radio sources as compared to high radio frequencies. Here, we present the early results from this survey. [less ▲]

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See detailProspects for radio observations of Particle-Accelerating Colliding-Wind Binaries with the Giant Metrewave Radio Telescope
De Becker, Michaël ULiege

in Bulletin de la Société Royale des Sciences de Liège (2019, October 31), 88

Synchrotron radiation identified in the radio domain for several tens of binary systems made of massive stars provides compelling evidence that a particle acceleration process is at work in these objects ... [more ▼]

Synchrotron radiation identified in the radio domain for several tens of binary systems made of massive stars provides compelling evidence that a particle acceleration process is at work in these objects, hence their Particle-Accelerating Colliding-Wind Binaries (PACWB) status. Measurements of the synchrotron radio emission allow to investigate the non-thermal physics and to derive some of their properties. Non-thermal spectra are known to increase at lower frequencies, while thermal ones increase toward higher frequencies. In this context, it is worth investigating the expectations from longer wavelengths such as those measured by the Giant Metrewave Radio Telescope in India, in complementarity with the most abundant measurements at centimetric wavelengths obtained with other radio observatories such as the VLA or ATCA. [less ▲]

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See detailProceedings of the 2nd BINA workshop: BINA as an expanding international collaboration
De Cat, P.; Lampens, P.; Joshi, S. et al

in Bulletin de la Société Royale des Sciences de Liège (2019, October 31), 88

The Belgo-Indian Network for Astronomy & astrophysics (BINA) was initiated in 2014 to stimulate Belgian and Indian astronomers to collaborate on projects that are based on observations with the Indo ... [more ▼]

The Belgo-Indian Network for Astronomy & astrophysics (BINA) was initiated in 2014 to stimulate Belgian and Indian astronomers to collaborate on projects that are based on observations with the Indo-Belgian telescopes and other telescopes of interest. After the successful event of the 1st BINA workshop that took place in Nainital (India) in November 2016, the 2nd BINA workshop was held in Brussels (Belgium) in October 2018 to promote this network as an expanding international collaboration. In this paper, a detailed overview of this event is presented as an introduction to the proceedings containing 39 additional papers corresponding to presentations that were given at the 2nd BINA workshop. [less ▲]

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See detailPolarization study of massive binaries with the ARIES-1.04 m telescope
Arora, B.; Pandey, J. C.; Joshi, A. et al

in Bulletin de la Société Royale des Sciences de Liège (2019, October 31), 88

We present preliminary results obtained from optical (B, V, R, and I) linear polarimetric observations of the O+O massive binary DH Cep. The observations were made on six nights in 2017 with the Aries ... [more ▼]

We present preliminary results obtained from optical (B, V, R, and I) linear polarimetric observations of the O+O massive binary DH Cep. The observations were made on six nights in 2017 with the Aries IMaging POLarimeter (AIMPOL) mounted at the back of the 1.04-m Sampurnanand Telescope of ARIES. The average intrinsic linear polarization in each of the B, V, R, and I photometric bands is found to be less than 1%. The degree of polarization as well as the polarization angle appear to be orbital phase dependent. The significant polarization variability noticed towards shorter wavelengths ( i.e. B and V bands) is indicative of the asymmetric circumstellar envelope. [less ▲]

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See detailMaze influence to radiological protection around industrial radiographic sources (Co-60) under 100 Ci
Guembou Shouop, Cébastien Joel ULiege; BAK, Sang-In

in Transactions of the Korean Nuclear Society (2019, October 24)

The shielded enclosure design around the gamma radiography facilities under 100 Ci cobalt-60 source was evaluated as well as the maze design and source positions contribution to the dose limitation ... [more ▼]

The shielded enclosure design around the gamma radiography facilities under 100 Ci cobalt-60 source was evaluated as well as the maze design and source positions contribution to the dose limitation consistent with the ALARA principle. It was found that the most effective maze type to shield gamma radiations was double (multiple by extension) corners maze type. From discussions on the source positions, practitioners should select the optimizing position from both left or right depending on the length of the maze in the case of a single corner type, but never at the central position. The obtained results provided an insightful contribution to the radiological protection in industrial radiography. [less ▲]

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See detailStrong lensing studies with the 3.6-m Devasthal Optical Telescope: opportunities and challenges
Sluse, Dominique ULiege

in Bulletin de la Societe Royale des Sciences de Liege (2019, October 01), 88

Strongly-lensed quasars and active galactic nuclei (AGN), namely active galaxies that appear multiply imaged due to a foreground lensing galaxy, are exceptional astrophysical tools that may be used to ... [more ▼]

Strongly-lensed quasars and active galactic nuclei (AGN), namely active galaxies that appear multiply imaged due to a foreground lensing galaxy, are exceptional astrophysical tools that may be used to probe the expansion rate of the Universe, study the evolution of galaxies and of their dark matter content over cosmic time, and zoom in into the structure of AGNs. We are entering a new era in observational astrophysics, no longer limited by the number of accessible targets, but by our ability to carry out follow-up observations. We list several science cases where the DOT and other Belgo-Indian telescopes may provide crucial high-quality data: (1) Photometric monitoring of strong lenses for cosmography (2) Confirmation of new strongly-lensed candidates in the era of big surveys (3) Advanced study of the structure of AGN using the technique of gravitational microlensing. For each of these topics, we provide a brief scientific overview of the technique and scientific question, and quantify the observational requirements for successful programs. <P /> [less ▲]

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See detailA SINGLE CENTER EXPERIENCE WITH 157 CONTROLED DCD-LIVER TRANSPLANTATIONS
Schielke, Astrid Anita ULiege; Paolucci, Maité ULiege; MEURISSE, Nicolas ULiege et al

in Transplant International (2019, October), 32(S2), 029165

Introduction: Donation after circulatory death (DCD) have been proposed to partially overcome the organ donor shortage. DCD-LT remains controversial, with reported increased risk of graft loss and ... [more ▼]

Introduction: Donation after circulatory death (DCD) have been proposed to partially overcome the organ donor shortage. DCD-LT remains controversial, with reported increased risk of graft loss and retransplantation. The authors retrospectively reviewed a single centre experience with controlled DCD-LT in a 15-year period. Patients and Methods: 157 DCD-LT were consecutively performed between 2003 and 2017. All donation and procurement procedures were performed as controlled DCD in the operating theatre. Data are presented as median (ranges). Median donor age was 57 years (16–83). Median DRI was 2.242 (1.322–3.554). Allocation was centre-based. Median recipient MELD score at LT was 15 (6–40). Mean follow-up was 37 months. No patient was lost to follow-up. Results: Median total DCD warm ischemia was 19 min (7–39). Median total ischemia was 313 min (181–586). Patient survivals were 89.8%, 75.5% and 73.1% at 1,3 and 5 years, respectively. Graft survivals were 89%, 73.8% and 69.8% at 1,3 and 5 years, respectively. Biliary complications included mainly anastomotic strictures, that were managed either by endoscopy or hepatico- jejunostomy. Two patients were retransplanted due to intrahepatic ischemic lesions. Conclusion: In this series, DCD LT provides results similar to classical LT. Short cold ischemia and recipient selection with low MELD score may be the keys to good results in DCD LT, in terms of graft survival and avoidance of ischemic cholangiopathy. [less ▲]

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See detailClassification of dermatophytes by a multilocus phylogenetic approach based on Tef-1α, beta tubulin and ITS genes
SACHELI, Rosalie ULiege; Tomé, Carolina; ADJETEY BAHUN, Akolé ULiege et al

in Mycoses (2019, October)

Objectives: Identification of dermatophytes to the species level is epidemiologically, ecologically and therapeutically significant. The use of phylogenetic species concepts based on rDNA internal ... [more ▼]

Objectives: Identification of dermatophytes to the species level is epidemiologically, ecologically and therapeutically significant. The use of phylogenetic species concepts based on rDNA internal transcribed spacer (ITS) regions have improved the taxonomy of dermatophytes. However, it has been shown that for some species, confirmation and refinement using other genes are needed. Indeed, there are problems with accurate definition and characterization of dermatophytes especially among the Trichophyton mentagrophytes series. Intra- and interspecies variations of the translation elongation factor 1-α (Tef-1α) gene were evaluated as a new identification marker in a wide range of dermatophytes. The aim of this study was to evaluate the discriminatory power of a phylogenetic tool based on concatenated sequences of three genomic regions including Tef-1α, ITS (ITS1 to ITS2) and beta-tubulin to differentiate: 1/ the anthropophilic Trichophyton interdigitale species from the zoophilic Trichophyton mentagrophytes 2/ the two closely related African anthropophilic species Trichophyton violaceum from Trichophyton soudanense. Methods: 26 well characterized strains of T. interdigitale/mentagrophytes have been selected including 3 IHEM reference strains; 30 well characterized strains of T. soudanense/T.violaceum including 2 IHEM reference strains were also included. All strains were submitted to ITS, beta-tubulin and Tef-1α PCR/sequencing. Moreover, identification was completed by real time PCR DermaGenius® (PathoNostics). Alignments were performed using MUSCLE in Seaview. The alignments for each of the three genes were then concatenated together based on the name of the sample and gaps were added between genes. Phylogenies were then inferred on the concatenated alignment using PhyML. Results: After generation of the phylogenetic tree by concatenation of the three sequence genes, the differentiation between T. interdigitale and T. mentagrophytes was clear. The 16 strains of T. interdigitale were well classified into one distinct group on the dendrogram. The 10 strains of zoophilic T. mentagrophytes were well distinct of the anthropophilic group and defined by another clade on the dendrogram. Reference strains were correctly classified into the two previously defined groups. Regarding the differentiation between T. soudanense and T. violaceum, the concatenation permitted to define two well distinct clades on the dendrogram. One clade containing 10 T. violaceum tested and the other containing 20 T. soudanense included in the study and one strain previously identified as T. violaceum . Reference strains were correctly classified into each corresponding clade. Conclusion: The concatenation of ITS, beta-tubulin and Tef-1α genes sequences allows the generation of a discriminating dendrogram between the zoophilic T. mentagrophytes and the anthropophilic T. interdigitale. This is less powerfull between the two closely related African anthropophilic species T. violaceum and T. soudanense. Anyway This multilocus phylogenetic approach allows to better define the species boundaries between these dermatophytes and facilitates the molecular characterization of these species in routine diagnostic. [less ▲]

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See detailCLINICAL OUTCOMES OF DCD TYPE V LIVER TRANSPLANTATION: DONATION AFTER EUTHANASIA
van Reeven, M; Gilbo, N; Monbaliu, D et al

in Transplant International (2019, October), 32(S2), 029134

Introduction: Due to shortage of donor organs, physicians and surgeons are forced to accept livers from donation after circulatory death (DCD) donors. One special group of DCD organs are those obtained ... [more ▼]

Introduction: Due to shortage of donor organs, physicians and surgeons are forced to accept livers from donation after circulatory death (DCD) donors. One special group of DCD organs are those obtained after euthanasia (DCD type V). To create more awareness on the possibility of organ donation after euthanasia, it is important to evaluate the results of transplantation with this type of graft. The aim of our study was to evaluate the outcome of DCD type V liver transplantation (LT) in the Netherlands and Belgium. Methods: All DCD type V LT performed until 2018 in all three Dutch LT centers and four out of six Belgian LT centers, were included in this study. Grafts that have been preserved with machine perfusion were excluded. Continuous data are expressed as median (IQR), categorical data as number (percentage). Results: Until 2018, 44 DCD type V LT have been performed. Five cases in which the liver was preserved by machine perfusion were excluded. Median age of donor and recipient was 51 years (42–58) and 56 years (48–64), respectively. A neurological disease was the most common underlying disease in donors requesting euthanasia, followed by psychiatric disorders. Median time between administration of the euthanatics and cold perfusion was 19 min (14–25). Peak AST and ALT levels in the recipients were 904 U/l (586–2,478) and 709 U/l (448– 1,841) respectively. One-, three- and five-year patient survival was 90%, 83% and 83%, respectively (figure 1). Five patients (13%) required a retransplantation, due to PNF (n = 1), HAT (n = 1) or post-transplant cholangiopathy (n = 3), the majority within the first year after the prior LT. Conclusion: Liver transplantations with grafts from donors who underwent euthanasia yield satisfying results during the relatively short follow up period that is currently available. Comparison of these results with DCD type III LT and donation after brain death (DBD) LT is currently ongoing. [less ▲]

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See detailBelgian national survey on tinea capitis: epidemiology and molecular investigations
SACHELI, Rosalie ULiege; Menatong, Xavière; Labarbe, Chloé et al

in Mycoses, Supplement (2019, October)

Objectives: Tinea capitis (TC) is a superficial infection of the scalp caused by dermatophyte fungi which affects mainly prepubescent children. This last decade, a huge increase of African anthropophilic ... [more ▼]

Objectives: Tinea capitis (TC) is a superficial infection of the scalp caused by dermatophyte fungi which affects mainly prepubescent children. This last decade, a huge increase of African anthropophilic strains causing tinea capitis, has been observed in Europe, probably due to immigration waves from African countries. The Belgian National Reference Center for Mycosis (NRC) has conducted a surveillance study about TC in 2018. This work presents final results of the study for the epidemiological part and preliminary results for the molecular part. Methods: Belgian laboratories were invited to send all dermatophytes strains isolated from the scalp from January to December 2018. Dermatologists were involved and were asked to fill a form containing several epidemiological information about the patient. Strains identification was confirmed by ITS sequencing. A multiplex pan-dermatophyte real time PCR assay (DermaGenius®, PathoNostics) was applied if necessary. Typing of the M.audouinii strains was done using rep-PCR method (Diversilab, BioMérieux). Results: A total of 337 strains have been collected from 337 patients. The main population concerned by TC was children from 5-9 years (165/337, 49,01%). Males (214/337, 63,5%) were more affected than females (123/337, 36,5%), the sex ratio M/F was of 1,74. The majority of the strains was collected in Brussels area (181/337, 53,8%), followed by Liege area (73/337; 21,7%). Other Belgian cities were less concerned by TC. Among known ethnical origins (n=119), African people (114/119, 96,2%) were more concerned by TC than European people (5/119, 3,8%), (p<0,0001). The majority of patients were from Guinea (26/119, 21,8%), followed by Cameroun (14/119, 11,8%) and RDC (14/119, 11,8%), many other African nationalities were represented (12 different countries, all over Africa). The main transmission mode of TC was the familial way (83,3% among known cases n=126, 105/126). The major etiological agent was Microsporum audouinii (118/337, 35%) followed by Trichophyton soudanense (83/337, 24,6%), T. tonsurans (27/337, 17%), M. canis (36/337, 10,7%), T. violaceum (28/337, 8,3%), T. benhamiae (7/337, 2,1%), T. mentagrophytes (5/337, 1,48%) and M. incurvatum (1/337, 0,3%). This last rare dermatophyte has never been reported as responsible for TC in Belgium before. M. audouinii strains have been genotyped by rep-PCR and three genotypic variants have been characterized, one of them circulating mainly in Brussels area. No link with a particular ethnical origin could be found among genotypic groups. Conclusion: African anthropophilic dermatophytes such as M.audouinii and T. soudanense are mainly responsible for tinea capitis in Belgium. Large cosmopolitan cities like Brussels and Liege are the most concerned. People from African origin are mostly affected by TC. Among the M. audouinii strains circulating in Belgium, a genotypic diversity has been characterized. [less ▲]

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See detailState Complexity of the Multiples of the Thue-Morse Set
Charlier, Emilie ULiege; Cisternino, Célia ULiege; Massuir, Adeline ULiege

in Electronic Proceedings in Theoretical Computer Science (2019, September 18), 305

The Thue-Morse set T is the set of those non-negative integers whose binary expansions have an even number of 1. The name of this set comes from the fact that its characteristic sequence is given by the ... [more ▼]

The Thue-Morse set T is the set of those non-negative integers whose binary expansions have an even number of 1. The name of this set comes from the fact that its characteristic sequence is given by the famous Thue-Morse word abbabaabbaababba···, which is the fixed point starting with a of the word morphism a→ab, b→ba. The numbers in T are sometimes called the evil numbers. We obtain an exact formula for the state complexity (i.e. the number of states of its minimal automaton) of the multiplication by a constant of the Thue-Morse set with respect to any integer base b which is a power of 2. Our proof is constructive and we are able to explicitly provide the minimal automaton of the language of all 2^p-expansions of the set mT for any positive integers m and p. The used method is general for any b-recognizable set of integers. As an application, we obtain a decision procedure running in quadratic time for the problem of deciding whether a given 2^p-recognizable set is equal to some multiple of the Thue-Morse set. [less ▲]

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See detailResistance of the beam-to-column component "column web panel in shear" - numerical and analytical investigations
Corman, Adrien ULiege; Jaspart, Jean-Pierre ULiege; Demonceau, Jean-François ULiege

in The online collection for conference papers in civil engineering (2019, September 16)

The « component method » is nowadays recognised by the European codes as the reference method to design and characterise steel and steel-concrete composite joints. This method, which may be seen as a ... [more ▼]

The « component method » is nowadays recognised by the European codes as the reference method to design and characterise steel and steel-concrete composite joints. This method, which may be seen as a macroscopic application of the finite element method, consists in dividing the joint into a series of zones through which the forces are transferred, those zones being named “components”. Among them, the so-called “column web panel in shear”, when activated and appropriately designed, can play a key role by providing a reserve of ductility to the joint. In Eurocode 3, Part 1-8, a simple analytical model is proposed to predict the behaviour of this component in terms of stiffness and resistance. However, some recent researches have demonstrated that, in many cases, the so-predicted resistance tends to be significantly overestimated, which turns out to be rather concerning from a safety point of view. In this context, the present paper will reflect first results of investigations conducted at Liège University on that problematic. In particular, beam-to-column welded joints have been studied in order to: (i) highlight the above-mentioned problem through comparisons between existing experimental results and Eurocode 3 predictions, (ii) develop a sophisticated finite element model using the software Abaqus©, (iii) validate this FEM model using existing experimental results and (iv) develop an extensive parametric study in order to highlight the key parameters governing the resistance capacity of the studied component. Based on the conducted investigations, the final goal consists in providing a new analytical formulation which is able to predict more accurately the resistance of the column web panel in shear. [less ▲]

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See detailPan-RTK inhibition of sLRIG1 mediates AXL downregulation in Glioblastoma
Neirinckx, Virginie ULiege; Hau, Ann-Christin; Schuster, Anne et al

in Neuro-Oncology (2019, September), 21(Supp 3),

INTRODUCTION Aberrant regulation of receptor tyrosine kinase (RTK) activity is characteristic of Glioblastoma (GBM). However, RTK-based targeted therapies have been largely unsuccessful in GBM patients ... [more ▼]

INTRODUCTION Aberrant regulation of receptor tyrosine kinase (RTK) activity is characteristic of Glioblastoma (GBM). However, RTK-based targeted therapies have been largely unsuccessful in GBM patients, partially due to the complexity and redundance of RTK signaling. LRIG1 (Leucine-rich Repeats and ImmunoGlobulindomains protein 1) is known as an endogenous inhibitor of epidermal growth factor receptor (EGFR) during health and disease, however its mechanism of action is poorly understood. We previously showed that the soluble form of LRIG1 potently inhibits of GBM growth in vivo, irrespective of EGFR expression level and status, suggesting the involvement of other RTKs. Here, we aimed to shed light on the molecular mechanisms underlying its anti-cancer activity. MATERIAL AND METHODS We generated a recombinant human soluble LRIG1 protein by expressing LRIG1 ectodomain in insect cells via baculovirus infection and subsequent His-tag purification. rh-sLRIG1 was applied in the medium of classical GBM cell lines, patient-derived GBM stem-like cells and patient-derived 3D tumor organoids. Using different cell-based assays, cell proliferation, invasion, cell morphology, as well as protein expression and protein-protein interactions were investigated. RESULTS We find that recombinant sLRIG1 efficiently reduces proliferation, invasion and viability of GBM cells and patient-derived organoids, and modulates cytoskeleton proteins and cell shape. In line with previous data, the effect of recombinant sLRIG1 is independent of EGFR expression. Interestingly sLRIG1 regulates several RTKs by direct protein downregulation, including AXL, while EGFR expression is not affected. At the molecular level, we find that sLRIG1 interferes with AXL dimerization, while no protein interaction with EGFR is detected. CONCLUSION We identify AXL as a novel LRIG1 target and provide evidence that sLRIG1-mediated RTK downregulation requires direct protein-protein interaction. These data pave the way for a potential therapeutic application of recombinant sLRIG1 in the inhibition of growth factor signaling in GBM. [less ▲]

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See detailNumerical and experimental investigation of simply supported steel beams under drop-weight impact tests
D'Antimo, Marina ULiege; Latour, Massimo; Jaspart, Jean-Pierre ULiege et al

in ce/papers (2019, September), 3(Issue3-4),

Due to the increase in terroristic attack and catastrophic events, the engineering structures are more and more likely to be subjected to abnormal loading conditions. Moreover, exceptional and ... [more ▼]

Due to the increase in terroristic attack and catastrophic events, the engineering structures are more and more likely to be subjected to abnormal loading conditions. Moreover, exceptional and unpredictable fatalities (extreme wind actions, explosions, car impacts...etc.) could lead to dreadful consequences, such as the partial or total progressive collapse of the structures. In view of this, it is required for engineers and researchers to have a better knowledge of all the phenomena associated to such exceptional loadings on structures. The behaviour of structures under impact, which is the main topic of the present paper, is a complex phenomenon and the response of a structure depends on a large number of variables such as the sensitivity of the materials to high rates of deformation, imperfection of the system, type and velocity of the impacting body among others. The present paper presents the behaviour of simply supported beams under impact loads. In particular, nine drop-weight impact tests have been performed at different level of impact energy. Within the proposed paper, the experimental impact tests conducted on simply support beams will be first presented. Then, exploiting the power of FEM analyses performed using the commercial software Abaqus/CAE© and validated against experimental evidences, different modelling techniques, along with several material models, are examined and compared. From these results, the ability of a detailed FE modelling to predict the response of impacted beams, when a proper modelling of the material behaviour at high rate of deformation is ensured, is discussed and a first estimation of the dynamic increase factor (DIF) for beam under impact loadings is given. [less ▲]

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See detailImpact of oral clomiphene citrate administration on prostatic volume and plasmatic testosterone concentrations in male beagles
Egyptien, Sophie ULiege; Beaufays, France ULiege; Brutinel, Flore ULiege et al

in Reproduction in Domestic Animals (2019, September), 54(3), 63-64

Clomiphene citrate (CC) is a synthetic non-steroidal agonist/antagonist oestrogenic compound with reported agonistic properties on dogs’ male reproductive system. This protocol compared the impact of a 0 ... [more ▼]

Clomiphene citrate (CC) is a synthetic non-steroidal agonist/antagonist oestrogenic compound with reported agonistic properties on dogs’ male reproductive system. This protocol compared the impact of a 0.5mg/kg/day treatment of CC on plasmatic testosterone concentrations and prostatic volume (PV) on 2 groups of 5 young (<1.5years) healthy versus old (>8years) dogs with benign prostatic hyperplasia (BPH). Each dog was its own control and parameters were evaluated weekly over 2 periods of 8 weeks: 1 week pre-treatment, 3 weeks of treatment (placebo or CC) and 4 weeks post-treatment. Prostatic measures made by transabdominal ultrasonography were fed in the formula: (1/2.6 (lxLxh)) + 1.8) to calculate the PV (cm3). Plasmatic testosterone concentration (ng/ml) was measured by radioimmunoassay on samples obtained at the end of the morning. A linear mixed model was built and differences of least squares means were used to analyse the results and test the effects of treatment, week, age and their interactions. CC dogs have significantly lower PV values (10.36) than control dogs (12.91; p=0.01). CC old dogs have significantly lower PV values (15.05) than control old dogs (18.31; p=0.03). PV significantly (p=0.01) decreases in CC dogs from week 1 to 5 and then re-increases from week 6 to 8. CC dogs have significantly lower testosterone levels (0.7543) than controls (1.17; p=0.01). There is a significant interaction between the week and the treatment as shown by a transient decrease in testosterone similar to that of the PV. We conclude that CC decreases testosterone production and prostatic volume, which opens doors for BPH treatment. [less ▲]

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See detailLes lieux de culte des nouvelles églises évangéliques : une contribution au patrimoine religieux belge ?
Druez, Laurence ULiege

in Congo Libertés (2019, September), 10

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See detailEffects of a hypnosis-based intervention on fatigue and sleep difficulties in post-treatment cancer patients
Grégoire, Charlotte ULiege; FAYMONVILLE, Marie-Elisabeth ULiege; VANHAUDENHUYSE, Audrey ULiege et al

in Journal of Psychosocial Oncology Research and Practice (2019, September), 1(1S),

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See detailTemplates for the k-binomial complexity of the Tribonacci word
Lejeune, Marie ULiege; Rigo, Michel ULiege; Rosenfeld, Matthieu ULiege

in Lecture Notes in Computer Science (2019, September), 11682

Consider k-binomial equivalence: two finite words are equivalent if they share the same subwords of length at most k with the same multiplicities. With this relation, the k-binomial complexity of an ... [more ▼]

Consider k-binomial equivalence: two finite words are equivalent if they share the same subwords of length at most k with the same multiplicities. With this relation, the k-binomial complexity of an infinite word 𝐱 maps the integer n to the number of pairwise non-equivalent factors of length n occurring in 𝐱. In this paper based on the notion of template introduced by Currie et al., we show that, for all 𝑘≥2, the k-binomial complexity of the Tribonacci word coincides with its usual factor complexity 𝑝(𝑛)=2𝑛+1. A similar result was already known for Sturmian words, but the proof relies on completely different techniques that seemingly could not be applied for Tribonacci. [less ▲]

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See detailBCCM/ULC : genomic research on Polar cyanobacteria
Wilmotte, Annick ULiege; Beets, Kim ULiege; Simons, Véronique et al

in European Journal of Phycology (2019, August 27), 54(sup1), 31-117

The BCCM/ULC public collection of cyanobacteria aims to gather a representative portion of Polar cyanobacterial diversity from different ecological origins (microbial mats, soil crusts, cryoconites ... [more ▼]

The BCCM/ULC public collection of cyanobacteria aims to gather a representative portion of Polar cyanobacterial diversity from different ecological origins (microbial mats, soil crusts, cryoconites, endoliths, etc.) and ensure their ex-situ conservation in a context of global change. These strains are available for researchers to study the biodiversity, taxonomy, evolution, adaptations to harsh environmental conditions, and genomic make-up of Polar cyanobacteria. Currently, there are 120 unicyanobacterial strains of Polar origin in the collection (catalogue: http://bccm.belspo.be/catalogues/ulc-catalogue-search). The collection is ISO 9001 certified for depositing and distributing strains, as part of the multi-site certification of the Belgian Co-ordinated Collections of Micro-organisms (BCCM) consortium. Morphological and molecular identification (based on 16S rRNA sequences) indicate that the strains belong to the orders Chroococcales, Chroococcidiopsidales, Nostocales, Oscillatoriales, Pleurocapsales, and Synechococcales. This broad genotypic distribution makes the BCCM/ULC collection particularly interesting for phylogenomic studies. The first genome of an axenic Antarctic strain, Phormidesmis priestleyi ULC007, was sequenced. To investigate the occurrence of genes involved in the cold stress response, a selection of 42 PEGs (protein encoding genes) linked to cold adaptation was studied in 72 cyanobacterial genomes. By comparing the genes copy numbers as a proxy of adaptation, our results underline the importance of different functions in the adaptation mechanisms to the polar environment (e.g. DNA repair, Heat shock proteins, EPS biosynthesis). We also described a metagenomic pipeline that enables the easy recovery of genomes from non-axenic cultures, tested on 17 cyanobacterial strains from the BCCM/ULC collection. In parallel, we assembled 31 co-cultivated bacteria (12 nearly complete) from the same cultures and showed that they mostly belong to Bacteroidetes and Proteobacteria. [less ▲]

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See detailUnconstrained Monotonic Neural Networks
Wehenkel, Antoine ULiege; Louppe, Gilles ULiege

in Advances in Neural Information Processing Systems 32 (2019) (2019, August)

Monotonic neural networks have recently been proposed as a way to define invertible transformations. These transformations can be combined into powerful autoregressive flows that have been shown to be ... [more ▼]

Monotonic neural networks have recently been proposed as a way to define invertible transformations. These transformations can be combined into powerful autoregressive flows that have been shown to be universal approximators of continuous probability distributions. Architectures that ensure monotonicity typically enforce constraints on weights and activation functions, which enables invertibility but leads to a cap on the expressiveness of the resulting transformations. In this work, we propose the Unconstrained Monotonic Neural Network (UMNN) architecture based on the insight that a function is monotonic as long as its derivative is strictly positive. In particular, this latter condition can be enforced with a free-form neural network whose only constraint is the positiveness of its output. We evaluate our new invertible building block within a new autoregressive flow (UMNN-MAF) and demonstrate its effectiveness on density estimation experiments. We also illustrate the ability of UMNNs to improve variational inference. [less ▲]

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See detailVideo Game Détournement: Playing Across Media
Barnabé, Fanny ULiege

in DiGRA Journal (2019, August)

Taking as a starting point the French concept of “artistic détournement” and its application in the context of video games, this paper aims to study creative remix practices that use video games as ... [more ▼]

Taking as a starting point the French concept of “artistic détournement” and its application in the context of video games, this paper aims to study creative remix practices that use video games as materials or as matrices to produce derivative works. Precisely, the research examines a diversified range of productions whose common feature is to be created from video games (mods, machinimas, let’s play videos…) in order to question the relationships between the notions of détournement and play. Where is the boundary between these two activities? How to define and categorize the various forms of détournements in the specific context of the video game culture? Can these remix practices that go beyond the frame of the game and extend themselves to other media be described as “playful”? By crossing rhetoric and theories of play, this paper will try to answer these questions. [less ▲]

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See detailDevelopment of VUV multilayer coatings for SMILE-UVI instrument
Loicq, Jerôme ULiege; Fleury-Frenette, Karl ULiege; Blain, Pascal ULiege et al

in International Conference on Space Optics — ICSO 2018 (2019, July 12)

he Ultraviolet Imager (UVI) instrument is a very challenging imager developed in the frame of the SMILE-ESA mission. The UV camera will consist of a single imaging system targeted at a portion of the ... [more ▼]

he Ultraviolet Imager (UVI) instrument is a very challenging imager developed in the frame of the SMILE-ESA mission. The UV camera will consist of a single imaging system targeted at a portion of the Lyman-Birge-Hopfield (LBH) N2 wavelength band. The baseline design of the imager meets the requirements to record snapshots of auroral dynamics with sufficient spatial resolution to measure cusp processes (100 km) under fully sunlit conditions from the specified apogee of the spacecraft. To achieve this goal, the UVI instrument utilizes a combination of four on-axis mirrors with an intensified FUV CMOS based camera. The mirrors will be coated with spectral selective interferometric layers to provide most of the signal filtering. The objective of these filters is to select the scientific waveband between 160 and 180 nm. The combined four mirrors have to give an out-of-band rejection ratio as high as possible to reject light from solar diffusion, dayglow and unwanted atomic lines in a range of 10-8 – 10-9. Different multilayer coatings are considered and optimized according to the π- multilayer equation for different H/L ratio and for different angles of incidence. Our theoretical evaluation shows a least a modification of the reflectance spectrum as a function of the angle of incidence, so that the optical beams hitting the different mirrors can have different optical properties depending on the optical fields and the distribution of the rays on the pupil. In this paper the effect of fields and coating homogeneity on the spectral throughput of the UVI instrument will be assessed and described. [less ▲]

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See detailDevelopment of a space-based nulling interferometer to detect and characterize exoplanets
Schifano, Luca; Defrere, Denis ULiege; Absil, Olivier ULiege et al

in Proceedings of SPIE: The International Society for Optical Engineering (2019, July 12)

The development of small space-based platforms for nulling interferometric observations could be the pathfinder of a new era in exoplanetology. While planetary transit and radial velocity are the most ... [more ▼]

The development of small space-based platforms for nulling interferometric observations could be the pathfinder of a new era in exoplanetology. While planetary transit and radial velocity are the most productive ways to detect exoplanets, such techniques are indirect detections. For deeper characterization of exoplanets, direct detection techniques should be developed. By injecting direct light coming from exoplanets into spectrometers, we could study their chemical composition, search for biosignatures, and possibly infer the presence of life. The low number of photons to be gathered from the planets, high contrast with the star and small angular resolution are the major difficulties for a direct detection. However, nulling interferometry seems to be a solution to tackle these challenges. By combining the light of two or more telescopes, we would considerably increase the angular resolution, and thus could potentially lead to the detection of Earth-size rocky exoplanets around Solar-type stars. Moreover, with a π- phase shift between the two interferometer arms, the starlight is reduced which allows the detection of much fainter objects around the star. In this paper it will be presented the development of a new mission based on nulling interferometry and dedicated to the Alpha Centauri system. As our nearest stellar system, it is a prime target to investigate for the research of new worlds. Monte-Carlo simulations about potential exoplanet yield of such an interferometer will be described, for different assumptions such as the detection wavelength and telescope size. Single-mode fibers and integrated optics will also be investigated for this mission. This could lead to low-cost type missions with a high potential of scientific return. [less ▲]

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See detailStudy of High Purity Nickel with Various Grain Sizes Using Shear Tests
Yuan, Sibo ULiege; Habraken, Anne ULiege; Milis, Olivier ULiege et al

in AIP Conference Proceedings (2019, July 02)

In this paper, an experimental campaign is described. The high purity Nickel sheet with a thickness of 500 microns is tested at low triaxiality. Thanks to a novel geometry, the axial tensile force is ... [more ▼]

In this paper, an experimental campaign is described. The high purity Nickel sheet with a thickness of 500 microns is tested at low triaxiality. Thanks to a novel geometry, the axial tensile force is converted to shear the material in a local region. Different series of tests are carried out in function of grain sizes. A strong influence on the global mechanical response can be observed due to different numbers of grains through the thickness of sample. The experimental curves are reproduced by finite element simulations with an isotropic macroscopic Hollomon constitutive law relying on different sets of parameters. Next, a small representative volume is considered. Using the identified parameters for each grain size, a sandwich approach is applied. The results of the single constitutive law approach and the sandwich approach are compared. [less ▲]

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See detailAssociations of bone metabolism markers with neck circumference in adult arab women
Sabico, S.; Bassam, R.; Alnaami, A et al

in Osteoporosis International (2019, July), 30(S2), 307-308

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See detailEuropean guidance for the diagnosis and management of osteoporosis in postmenopausal women
Kanis, J.A; Cooper, C.; Rizzoli, R. et al

in Osteoporosis International (2019, July), 30(S2), 153-154

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See detailAssociation of genetic polymorphisms with osteopenia in Saudi postmenopausal women
Abdi, S.; Mohammed, A.; Amer, O. et al

in Osteoporosis International (2019, July), 30(S2), 308

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See detailEnergy expenditure of nursing home residents and participation in exercise classes: an analysis of the SENIOR cohort
Charles, Alexia ULiege; Buckinx, Fanny ULiege; Mouton, Alexandre ULiege et al

in Osteoporosis International (2019, July), 30(S2), 430

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See detailCost-effectiveness of sequential treatment with abaloparatide followed by alendronate vs. alendronate monotherapy for USA women at increased risk of fracture
Hiligsmann, M.; Williams, S.A.; Fitzpatrick, L.A. et al

in Osteoporosis International (2019, July), 30(S2), 503-504

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See detailDeterminants and health consequences of a rapid muscle health decline in older adults from the SacoPhAge study.
Locquet, Médéa ULiege; Beaudart, Charlotte ULiege; Croisier, Jean-Louis ULiege et al

in Osteoporosis International (2019, July), 30(S2), 211275

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See detailMediterranean diet and knee osteoarthritis outcomes: a longitudinal cohort study.
Veronese, N.; Cooper, C.; Guglielmi, G. et al

in Osteoporosis International (2019, July), 30(S2), 457

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See detailDevelopment of a frailty specific patient reported outcome (PRO): the FRAILQOL
Buckinx, Fanny ULiege; Beaudart, Charlotte ULiege; Reginster, Jean-Yves ULiege et al

in Osteoporosis International (2019, July), 30(S2), 465-466

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See detailIdentification and prioritization of important oucomes for patients in sarcopenia.
Beaudart, Charlotte ULiege; Bruyère, Olivier ULiege; Reginster, Jean-Yves ULiege et al

in Osteoporosis International (2019, July), 30(S2), 189-190

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