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See detailDu plus petit au plus grand
Beckers, Albert ULiege

Scientific conference (2017, June 08)

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See detailMolecular surveillance of Plasmodium falciparum resistance to artemisinin-based combination therapies in the Democratic Republic of Congo
Mvumbi Makaba, Dieudonné; Bobanga Lengu, Thierry; Kayembe Ntumba, Jean-Marie et al

in PLoS ONE (2017)

Malaria is a major public health problem in the Democratic Republic of Congo. Despite progress achieved over the past decade in the fight against malaria, further efforts have to be done such as in the ... [more ▼]

Malaria is a major public health problem in the Democratic Republic of Congo. Despite progress achieved over the past decade in the fight against malaria, further efforts have to be done such as in the surveillance and the containment of Plasmodium falciparum resistant strains. We investigated resistance to artemisinin-based combination therapies currently in use in Democratic Republic of Congo by surveying molecular polymorphisms in three genes: pfcrt, pfmdr1 and pfk13 to explore possible emergence of amodiaquine, lumefantrine or artemisinin resistance in Democratic Republic of Congo. This study essentially revealed that resistance to chloroquine is still decreasing while polymorphism related to amodiaquine resistance seems to be not present in Democratic Republic of Congo, that three samples, located in the east of the country, harbor Pfmdr1 amplification and that none of the mutations found in South-East Asia correlated with artemisinine resistance have been found in Democratic Republic of Congo. But new mutations have been identified, especially the M476K, occurred in the same position that the M476I previously identified in the F32-ART strain, strongly resistant to artemisinine. Antimalarial first-line treatments currently in use in Democratic Republic of Congo are not associated with emergence of molecular markers of resistance. [less ▲]

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See detailPromouvoir, développer et optimiser les pratiques de feedback formatif en Bloc1 en Faculté d'Architecture - Partage d'expériences
Silvestre, Aude ULiege; Seijkens, Nicolas ULiege

Scientific conference (2017, June 08)

Au cours des quatre dernières années, l’Institut de Formation et de Recherche en Enseignement Supérieur (IFRES) et le Service Guidance Étude (SGE) de l’Université de Liège ont développé et mis en place un ... [more ▼]

Au cours des quatre dernières années, l’Institut de Formation et de Recherche en Enseignement Supérieur (IFRES) et le Service Guidance Étude (SGE) de l’Université de Liège ont développé et mis en place un projet visant à promouvoir et optimiser les pratiques de feedback formatif et d’Assessment for Learning en première année. Le Projet Feedback a été initié en 2013 et poursuivi en 2014 au sein de la Faculté des Sciences appliquées, adapté depuis juin 2014 en Faculté de Droit, de Science Politique et de Criminologie, depuis 2015 en Faculté des Sciences, et depuis 2016 en Faculté d’Architecture. Le projet est mené dans un but de soutien à l’apprentissage et à la qualité de l’expérience vécue par les étudiants de première année. Il vise à engager un groupe d’enseignants en Architecture dans une réflexion portant sur leurs pratiques d’enseignement et d’évaluation, et de potentielles régulations à y apporter. Chacun des participants impliqués est porté à réenvisager certaines dimensions de son enseignement de première année à la lumière des théories se rapportant aux pratiques de feedback lors d’entretiens individuels structurés, avec l’équipe pédagogique encadrante (une référente pédagogique et une architecte), mais également lors de séances plénières collectives. Des initiatives, telles que des tests de prérequis en mathématique, ou une grille de critères pour le dessin ou encore outil réflexif d’aide à la prise de note en atelier de projet, ont été développées dans divers cours (Mathématique ; Théorie de l’Architecture ; Construction et d’Applications Constructives ; Atelier de Projet ; etc.). Parmi la quinzaine d’initiatives élaborées, certaines ont déjà été mises en œuvre, d’autres sont toujours en développement actuellement ou sont en phase de réflexion. L’avis des étudiants est au cœur des préoccupations du Projet Feedback. Plusieurs questionnaires ont été administrés aux étudiants, afin d’investiguer leurs perceptions relatives à diverses initiatives mises en place lors de l’année académique 2016-2017. [less ▲]

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See detailExemples tirés de la pratique: les phanères
Hayette, Marie-Pierre ULiege

Conference (2017, June 08)

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See detailFatigue resistant designs using stress-based topology optimization
Collet, Maxime ULiege; Bauduin, Simon ULiege; Fernandez Sanchez, Eduardo Felipe ULiege et al

Conference (2017, June 08)

Stress based topology optimization has received great interest since almost 20 years because of the innovative designs that can be achieved to answer strength requirements. Fatigue is an important mode of ... [more ▼]

Stress based topology optimization has received great interest since almost 20 years because of the innovative designs that can be achieved to answer strength requirements. Fatigue is an important mode of failure in mechanical engineering and accounting for it as soon as the early stage of design using topology optimization sounds primordial. Literature reports many good results for shape optimization [Mrzyglod & Zielinsky(2006)] whereas in the field of topology optimization several authors have shown that considering fatigue in an optimization framework leads to more relevant solutions where fluctuating loads are involved [Holmberg E.(2015), Collet et al(2016), Svärd(2015)]. In order to check the good behavior of the implementation, we first investigate the implementation of an advanced fatigue criterion, i.e. the multiaxial Dang Van criterion [Dang Van et al(1989)], in the framework of a density-based topology optimization problem. The choice of this fatigue criterion is justifed by its good applicability in automotive or aeronautic industry as well as its relevancy with respect to experimental results. We present the sensitivity analysis with stress constraints and present some classical benchmarks to illustrate the behavior of the optimized solution. In a second time, we introduce the fatigue resistance in the well-known microstructural design [Sigmund (1999)]. The new additive manufacturing techniques allow to fabricate components exhibiting architectured materials. In this perspective, ensuring the fatigue resistance of the cellular material will by extension ensure the structural integrity of the overall structure itself. Both types of optimization framework are evaluated in term of their numerical performances and are compared to classical results generated by a regular stress-based topology optimization. Finally, the results are 3D-printed to assess for their manufacturability. [less ▲]

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See detailDiametral dimension and property Omega Bar for spaces Snu
Demeulenaere, Loïc ULiege

Conference (2017, June 08)

Spaces Snu are metrizable sequence spaces defined by Jaffard in the context of multifractal analysis and signal treatment. From a functional analysis point of view, the study of these spaces points out ... [more ▼]

Spaces Snu are metrizable sequence spaces defined by Jaffard in the context of multifractal analysis and signal treatment. From a functional analysis point of view, the study of these spaces points out some topological properties, such as the facts they are locally pseudoconvex in general and locally p-convex in certain cases, Schwartz, and non-nuclear. In this talk, we focus on two topological invariants, namely the diametral dimension (Bessaga, Mityagin, Pelczynski, Rolewicz) and the property "Omega Bar" (Vogt, Wagner). Firstly, we revisit a result of Aubry and Bastin giving the diametral dimension of locally p-convex spaces Snu and extend it to some non-locally p-convex spaces Snu. Secondly, we explain how these developments can be used to prove that a subclass of spaces Snu (among which the locally p-convex ones) verifes the condition Omega Bar. [less ▲]

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See detailOccurrence and fate of emerging organic contaminants (EOCs) in the aquifers of Barcelona
Jurado Elices, Anna ULiege

Scientific conference (2017, June 07)

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See detailFire risk assessment of multi-story buildings based on fragility analysis
Gernay, Thomas ULiege; Elhami Khorasani, Negar; Garlock, Maria

in Nigro, Emidio; Bilotta, Antonio (Eds.) Proceedings of the 2nd International Fire Safety Symposium - IFireSS 2017 (2017, June 07)

Recent efforts aim at assessing the fire performance of structures in a probabilistic framework. But there is still no well-established method to quantify the reliability of entire buildings. Previous ... [more ▼]

Recent efforts aim at assessing the fire performance of structures in a probabilistic framework. But there is still no well-established method to quantify the reliability of entire buildings. Previous works focused on isolated structural members, therefore not allowing for a determination of the global safety level of buildings. Here, a new methodology is developed to quantify the reliability of buildings in fire. The methodology uses Monte Carlo simulations for constructing fragility functions associated with different fire breakout locations in a building, then combines the functions to characterize the overall building conditional probability of failure, and finally incorporates the probabilistic models for intensity measure and fire occurrence likelihood. The methodology is applied to multi-story steel buildings. This work addresses fire reliability at the building scale, and therefore is useful for standardizing safety level as well as for evaluating community resilience. [less ▲]

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See detailProbing Single Molecules with the AFM: Force, Motion, Dynamics, and Function
Duwez, Anne-Sophie ULiege

Conference (2017, June 07)

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See detailTopology optimization of mechanical components fabricated by additive manufacturing for a Shell Eco Marathon vehicle
Alarcon Soto, Pablo ULiege; Collet, Maxime ULiege; Bauduin, Simon ULiege et al

Conference (2017, June 07)

Since 2004, a team of students and researchers of University of Liege takes part to the Shell Eco Marathon race with a lightweight electric vehicle. The goal of this pedagogical project is to design ... [more ▼]

Since 2004, a team of students and researchers of University of Liege takes part to the Shell Eco Marathon race with a lightweight electric vehicle. The goal of this pedagogical project is to design, fabricate and operate a vehicle exhibiting the least energy consumption. A key factor to reduce the energy consumption is to minimize the vehicle mass. Besides the body structure made of CRFP, engineers have also to focus on the weight reduction of any mechanical parts of the powertrain, transmission and of rolling gear. The combination of topology optimization with additive manufacturing techniques allows to propose innovative designs exhibiting a high performance to weight ratio. Topology optimized designs are often characterized by a high geometrical complexity that is not possible to manufacture without 3D printing. This work presents the CAE design methodology that was developed to combine topology and shape optimization with 3d printing manufacturing. Novel developments both in shape and topology optimization have also been realized for the specific character of these components. The design methodology is illustrated with several applications of components of our new Eco Marathon prototype. They include a support for electric traction motors and different torque arms of the steering mechanism to be implemented in the new 2017 vehicle. The presentation is going to show the different design steps from the specifications and the formulation of the design problem to the 3D-printing of the parts: the topology optimization, interpretation and CAD reconstruction, shape optimization and detailed finite element verification of the solution. The optimization is performed thanks to the commercial software NX-TOPOL and the final CAD design is reconstructed in the CATIA environment software after a smoothing procedure in the NX-CAD environment. We show that the final design can be 3D-printed and a comparison with a design produced using traditional design approach is provided. [less ▲]

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See detailRésultats des élections présidentielles, législatives er tour en France.
Verjans, Pierre ULiege

Conference given outside the academic context (2017)

Que peut-on dire des élections françaises entre les deux tours des législatives? Quelles conséquences imaginables pour le PS à Liège?

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See detailRobot control based on human motion analysis with IMU measurements
Pellois, Robin ULiege; Joris, Laura ULiege; Bruls, Olivier ULiege

Scientific conference (2017, June 06)

The measurement of the operator motions can lead to innovation in the field of human-robot collaboration. Motion capture data can be used for robot programming by demonstration as well as controlling and ... [more ▼]

The measurement of the operator motions can lead to innovation in the field of human-robot collaboration. Motion capture data can be used for robot programming by demonstration as well as controlling and adapting robot trajectories. To measure motion, IMUs represent an interesting alternative compared to other sensing technologies such as vision. In order to illustrate this strategy, a demonstrator has been created to command a robot by human motion. Two IMU sensor modules are set on the human arm and forearm. The orientation of the module with respect to the inertial frame is computed by the fusion of accelerometer, magnetometer and gyroscope data. This information coupled with a simple human arm kinematic model is used to compute the wrist trajectory. The accuracy of this measurement has to be quantified. For that purpose, the estimated trajectory based on the IMU measurement is compared to the trajectory measured using a reference 3D optoelectronic motion analysis system (Codamotion, Charnwood Dynamics Ltd) available in the Laboratory of Human Motion Analysis of the University of Li`ege. [less ▲]

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See detailLeibniz's Metaphysics of Relations Revisited
Dony, Arthur ULiege

Scientific conference (2017, June 06)

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See detailRaman Hyperspectral Imaging: An essential tool in the pharmaceutical field
Sacre, Pierre-Yves ULiege; Netchacovitch, Lauranne ULiege; Dumont, Elodie ULiege et al

E-print/Working paper (2017)

Resulting from the combination of Raman spectroscopy and optical microscopy, Raman hyperspectral imaging has proven to be an indispensable tool in the pharmaceutical field. This article will broach a ... [more ▼]

Resulting from the combination of Raman spectroscopy and optical microscopy, Raman hyperspectral imaging has proven to be an indispensable tool in the pharmaceutical field. This article will broach a number of Raman hyperspectral imaging applications that were developed in our laboratory, in order to demonstrate the significance of the technique. [less ▲]

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See detailDiversity of farming systems integrating fish pond aquaculture in the province of Kinshasa in the Democratic Republic of the Congo
Mafwila Kinkela, Patrick ULiege; Kambashi Mutiaka, Bienvenu ULiege; Dogot, Thomas ULiege et al

in Journal of Agriculture and Rural Development in the Tropics and Subtropics (2017), Vol 118(No 1), 149-160

Agriculture and aquaculture systems are used by many farmers in various tropical countries of Asia, America and Africa. They have proven their relevancy to increase the productivity of farms by optimising ... [more ▼]

Agriculture and aquaculture systems are used by many farmers in various tropical countries of Asia, America and Africa. They have proven their relevancy to increase the productivity of farms by optimising nutrient fluxes and reducing requirements for external fertilisers. This article analysed the current state of fish farming and the way it is integrated with other farm subsystems in the urban/peri-urban and rural areas of Kinshasa, Democratic Republic of Congo. More precisely, it examined the allocation of resources at the farm level, the recovery of helophytes plants, and the fate of fish production choices and it explored the possibility of intensifying these existing integrated farming systems. After a census of ponds in the urban and rural areas of Kinshasa, an on-site survey was conducted on 150 fish pond farms to assess the different activities practiced on farms, the impact of integrating crops and livestock to fish pond aquaculture and the constraints of the system. A total of three thousand and twenty (3020) fish ponds were recorded in the urban and rural areas of Kinshasa. Among these farms integrated aquaculture-agriculture systems exist with a wide diversity of practices (about 79% of farms combined fish with livestock and/or vegetable production). No striking differences between fish farms according to the allocation of resources, fish production method such as monoculture or polyculture, the recovery of helophytes plants and the fate of fish production choice were found depending on the location. However, fish farms were differently managed when combined with agriculture and/or livestock. Regarding the integration of the different subsystems through nutrient fluxes, 11 different movements of material between subsystems were found in integrated farms. However, not all fluxes are equally used in all farms and therefore improvements cannot be generalised. Improvements to be explored are such as making better use of manure pond mud and helophyte plants. For this purpose, proper training of farmers might be critical. Finally, bringing farmers together in cooperatives could also contribute to reduce the cost of purchase and transportation of fish fry and feed. [less ▲]

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See detailImparting Knowledge in Humanities. About Some Practices of Scientific Blogging on Hypothèses
Mayeur, Ingrid ULiege

in Chan, Leslie; Loizides, Fernando (Eds.) Expanding Perspectives on Open Science: Communities, Cultures and Diversity in Concepts and Practices (2017, June 06)

My contribution aims to explain how a platform of electronic publishing such as OpenEdition might reach a larger public outside the academic sphere, and contribute to the revealing of research in the ... [more ▼]

My contribution aims to explain how a platform of electronic publishing such as OpenEdition might reach a larger public outside the academic sphere, and contribute to the revealing of research in the Humanities to civil society. Practices of academic blogging have expanded since the 2000's. Its potential as a vulgarization tool was acknowledged early. However, most initiatives in scientific blogging are concerned with the field of STM (Science, Technology, and Medicine). A quick overview of the classical literature about vulgarization shows that a great deal of attention is being paid to STM. As such, I propose to examine what the practices of communication are towards civil society in Humanities through Hypothèses, the blogging platform of OpenEdition. [less ▲]

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See detailA comparison of prescriptive and performance-based designs for fire as a primary or secondary event
Elhami Khorasani, Negar; Haase, Bryce; Fang, Chenyang et al

Scientific conference (2017, June 06)

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