Last 7 days
Bookmark and Share    
Full Text
See detailApplication of X-ray microtomography to investigate the effect of raw material properties on the kinetics of iron ores granulation
Evrard, Maxime ULg; Contreras, Rafael; Pirard, Eric ULg

Conference (2014, September)

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides ... [more ▼]

In modern ironmaking, granulation is the first step of the sintering process. It is typically carried out in continuous drum granulators using water as a binder, and involves multiple components besides iron ores, such as return fines and other recycled materials (dusts, mill scale, sludges), solid fuel (coke breeze or anthracite) and fluxes (limestone, lime, olivine, dunite or dolomite) (Ball, 1973). As it is necessary to maintain a consistent quality of the granules (size distribution, porosity, strength, etc.) despite of the varying iron ore origins, the question arises as to how the properties of the iron ore particles (size and shape) influence the granulation process. The granulation process is partly influenced by the characteristic of the feed and partly by the action of cohesive force inside the drum granulator (Newitt et al. 1958). The objective of this paper is to study the effect of raw material properties on the kinetics of iron ore granulation considering in particular the mechanisms ruling wet granulation for two iron ores and to know the factors which determine the texture, shape, porosity and mechanical strength of the granules. [less ▲]

Detailed reference viewed: 12 (0 ULg)
Full Text
Peer Reviewed
See detailThe efficiency of different simulation-based design methods in improving building performance
Nguyen, Anh Tuan; Reiter, Sigrid ULg

in Brebbia,, C.A.,; Pulselli, R. (Eds.) WIT Transactions on Ecology on The Built Environment, vol. 142 (2014, September)

This paper presents a pioneering effort to define the efficiency of the most common simulation-based design methods, namely the parametric simulation method (PSM) and the simulation-based optimization ... [more ▼]

This paper presents a pioneering effort to define the efficiency of the most common simulation-based design methods, namely the parametric simulation method (PSM) and the simulation-based optimization method (SOM), in improving two building performance indicators: thermal comfort and energy consumption. Three case-study houses were selected and their indoor conditions were continuously monitored during one summer month in 2012. Computer EnergyPlus models of these houses were established and then carefully calibrated by the monitoring data to improve the reliability of the numerical methods. Thermal performances of these houses during a year were simulated, then improved by the PSM and finally optimized by the SOM. By comparing the results of these two simulation-based design methods, this research found that both the PSM and SOM were very effective in improving these building performance indicators. This study found that the SOM is almost two times more efficient than the PSM in improving thermal comfort in naturally ventilated (NV) houses and life cycle cost in air-conditioned (AC) houses. In average, the discomfort period in NV houses could be reduced by 44.9% by the PSM while as high as 86.1% by the SOM, compared with the reference cases. The life cycle cost of AC houses had smaller reductions with 6.2% and 14.6% cut-off by the PSM and SOM, respectively. The results of this work give a strong and explicit insight of the actual efficiency of each design method. This work also shows great advantages of applications of advanced numerical approaches in the design of high performance buildings. [less ▲]

Detailed reference viewed: 43 (1 ULg)
Full Text
See detailLes drones au secours de la grande faune menacée de RDC
Linchant, Julie ULg; Lejeune, Philippe ULg; Vermeulen, Cédric ULg

in Parcs et Réserves (2014), 69(3), 5-13

Dans un contexte international de pressions de plus en plus intenses sur la faune sauvage, caractérisées notamment par une recrudescence intense du braconnage, le suivi régulier de la faune est essentiel ... [more ▼]

Dans un contexte international de pressions de plus en plus intenses sur la faune sauvage, caractérisées notamment par une recrudescence intense du braconnage, le suivi régulier de la faune est essentiel pour assurer sa conservation. La situation de la biodiversité en République Démocratique du Congo est particulièrement préoccupante suite aux nombreux conflits armés et aux pressions anthropiques qui en découlent, ainsi qu’au manque de moyens et d’investissement. Habituellement, le suivi de la faune est réalisé à l’aide d’inventaires pédestres et aériens. Cependant, ces méthodes font face à de nombreuses contraintes, notamment leur coût et la logistique importante qu’elles demandent. Elles sont aussi dangereuses pour les opérateurs, ces derniers risquant leur vie lors d’accidents de vol ou lors de rencontres avec des braconniers ou des animaux potentiellement dangereux. Dans ce contexte, l’utilisation des drones civils, actuellement en pleine expansion, représente une alternative aux méthodes classiques pour le suivi de la grande faune et la surveillance des aires protégées. En effet, cette nouvelle technologie présente un coût plus faible, une logistique facile et une prise en main rapide, ainsi qu’un minimum de risque pour les opérateurs. Néanmoins, elle en est à ses balbutiements et de nouvelles méthodes de suivi doivent être mises au point pour relever le défi imposé par les contraintes liées à ce matériel innovant, tels que la faible autonomie et le traitement de grands volumes de données. L’Université de Liège-Gembloux Agro-Bio Tech a bâti, en partenariat avec le CIFOR, le projet WiMUAS visant à développer ces nouvelles méthodes dans le cadre des aires protégées en RDC. Cet article s’appuie sur une revue bibliographique récente pour en présenter les trois principaux objectifs en regard des développements existants : - (i) la mise au point de nouvelles méthodes d’inventaire et de suivis ponctuels de la grande faune par analyse d’images et de vidéos obtenues par drone ; - (ii) la gestion des périphéries et activités illégales notamment grâce à la cartographie précise de ces activités qui peut être obtenue via l’imagerie drone ; - (iii) la lutte anti-braconnage qui pourrait être appuyée par une reconnaissance du terrain par drone pour rechercher et fournir des indices en limitant la mise en danger des gardes. [less ▲]

Detailed reference viewed: 16 (2 ULg)
Full Text
See detailSTARS of HEAVEN - interview ( Chicago, Juin 2014)
Sacré, Robert ULg

in ABS Magazine (2014), (n° 43), 28-32

Interview des membres des Stars of Heaven ; photos

Detailed reference viewed: 9 (2 ULg)
Peer Reviewed
See detailHow much time does it take for "experience design" to unfold?
Elsen, Catherine ULg; Leclercq, Pierre ULg

in Benz, Peter (Ed.) Designing Experiences: Positions and Approaches. (2014)

This paper specifically focuses on one aspect of the experience design process, sometimes even stressed as one if its shortcomings: the time it takes to properly gain insights about possible real-life ... [more ▼]

This paper specifically focuses on one aspect of the experience design process, sometimes even stressed as one if its shortcomings: the time it takes to properly gain insights about possible real-life experiences of proximal or distal end-users. In the process of making sense of sometimes conflicting viewpoints found in the literature about timing and its possible impact on design processes and outcomes, this paper compares four distinct settings and addresses the following research questions: • How “time-framing” the design process possibly filters (positively or negatively) the awareness designers have about end-users; • How the experimental protocols, their inherent limitations and artificialities, do shape the designers’ involvement in the process of designing for an end-user’s experience. Results put techniques for «disciplined creativity», such as brainstorming or analogies, front-to-front with more reflective approaches that unfold over more time, and discuss respective but complementary added values of both. [less ▲]

Detailed reference viewed: 32 (3 ULg)
Full Text
Peer Reviewed
See detailBioaccumulation of polybrominated diphenyl ethers (PBDEs) in Gammarus pulex: Relative importance of different exposure routes and multipathway modeling
Lebrun, Jérémie; Leroy, Delphine; Giusti, Arnaud ULg et al

in Aquatic Toxicology (2014), 154

Characterizing the exposure routes of an organism and its ability to regulate accumulated contaminants is a crucial step toward developing a biomonitor. To date, very little data are available on the ... [more ▼]

Characterizing the exposure routes of an organism and its ability to regulate accumulated contaminants is a crucial step toward developing a biomonitor. To date, very little data are available on the bioaccumulation kinetics of PBDEs in freshwater biota. This study aims at investigating the potential use of a litter-degrader widely distributed in European freshwaters, Gammarus pulex, as an indicator of exposure to PBDEs. In aquatic microcosms, gammarids were exposed to a mixture of brominated congeners (BDE-28, 47, 66, 85, 99, 100, 153, 154 and 183) to assess their ability to bioconcentrate PBDEs. Results show that all tested congeners are highly internalized by G. pulex and uptake rates of PBDEs are closely related to their partition coefficients (Kow). The determination of the elimination rate of BDE-47, the congener most readily accumulated by gammarids, indicated that metabolism and excretion of this congener are low in G. pulex, which argues in favor of its use as a quantitative biomonitor. Finally, bioaccumulation experiments were performed using contaminated leaves to determine the relative importance of dietary uptake in the contamination of gammarids. Even though water is the preeminent exposure route, a significant uptake of BDE-47 through food was observed (27%). We propose a biodynamic model that takes into account both exposure routes to describe BDE-47 bioaccumulation. This study supports the use of this ubiquitous amphipod as an early warning monitor of the bioavailable contamination of freshwaters by PBDEs. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailThe Double-Sarcophagus of Hierapytna (Creta). A Reassessment
Veymiers, Richard ULg

Conference (2014, September)

Detailed reference viewed: 22 (1 ULg)
Peer Reviewed
See detailLes objectifs de la formation des soignants en Education Thérapeutique du Patient : une proposition
Pétré, Benoît ULg; Guillaume, Michèle ULg; LEGRAND, Catherine et al

Conference (2014, September)

Detailed reference viewed: 11 (2 ULg)
Full Text
Peer Reviewed
See detailStand structure and species co-occurence in mixed and monodominant Central African tropical forests
Djuikouo, Marie Noël K.; Peh, Kelvin S.H.; Nguembou et al

in Journal of Tropical Ecology (2014), 30(5), 447-455

Detailed reference viewed: 17 (10 ULg)
Full Text
Peer Reviewed
See detailAutonomie de la volonté et concurrence régulatoire – le cas des relations familiales internationales
Wautelet, Patrick ULg

in Fulchiron, Hugues; Bergé, Jean-Sylvestre (Eds.) Vers un statut européen de la famille ? (2014)

L'autonomie de la volonté a connu un essor considérable dans le règlement des relations familiales internationales. Au-delà de la consécration toujours plus importante de l'autonomie de la volonté comme ... [more ▼]

L'autonomie de la volonté a connu un essor considérable dans le règlement des relations familiales internationales. Au-delà de la consécration toujours plus importante de l'autonomie de la volonté comme fondement de la règle de conflit de lois en matière familiale, la liberté des parties a reçu ces dernières années un appui important par le biais d'une jurisprudence ambitieuse tant de la Cour de justice de l'Union que de la Cour européenne des droits de l'homme. Dans le même temps, force est bien de constater que le droit de la famille semble constituer un îlot de résistance tenace face au mouvement d'unification et d'harmonisation. Les ingrédients semblent dès lors réunis pour le développement d'une véritable concurrence législative qui pourrait mener au spectre de la 'race to the bottom'. A l'offre de droits aux contenus différents se conjuge en effet une certaine possibilité de choix par les parties. Cette liberté de choix constitue un avatar évident de la mobilité qui fonde le pouvoir d'arbitrage des acteurs privés. La présente contribution a pour objectif de s'interroger sur l'existence réelle d'une telle concurrence normative. [less ▲]

Detailed reference viewed: 34 (1 ULg)
Full Text
See detailMaster-narratives for science policy. The interplay of political discourses on Science in Wallonia.
Charlier, Nathan ULg

Conference (2014, September)

Both in Europe and in the United States, scientific research and science, technology and innovation (STI) policies have undergone profound changes for about thirty years. These transitions are often ... [more ▼]

Both in Europe and in the United States, scientific research and science, technology and innovation (STI) policies have undergone profound changes for about thirty years. These transitions are often framed along dichotomous lines : an ‘old regime’ characterized by strong public funding, independent academia and a linear conception of innovation has supposedly been replaced by a ‘new regime’ in which research and innovation are conceived in systemic terms, regarding their economic and societal relevance (Rip 2000). My proposal states that this conceptualization is of little use when it comes to studying the evolution of STI policies at the regional level. In this paper, I investigate how global master narratives like the “Knowledge-based Economy”, the “Grand societal Challenges”, “Science, the endless Frontier”, “Responsible Research and Innovation”, etc. are locally articulated, and thereby become grounded in regional STI policymaking, research, and innovation. These narratives, as explanatory resources and mobilizing resources, provide stakeholders with different visions; they are related to power relations between groups and individuals, to institutional settings and to policy trajectories. In my contribution, I study the four narratives in context; i.e. in different situated discourses of STI stakeholders. I consider multiple issues: who is telling what, to whom, why, when, where, and in which form. Instead of dichotomizing, investigating the evolutions of STI policies with a narrative framework provides an enriched description for complex local situations, towards a more political reading of the transitions. [less ▲]

Detailed reference viewed: 10 (1 ULg)
See detailExperimental evidence and numerical prediction of nonlinear modal interactions in a real-life aerospace structure
Renson, Ludovic ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the ISMA 2014 conference (2014, September)

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably ... [more ▼]

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably because their analysis is regarded as impractical. The objective of the present contribution is to show that there now exists experimental and numerical methodologies which can deal with nonlinear phenomena in real-life structures. Specifically, this study investigates nonlinear modal interactions evidenced during the qualification campaign of the SmallSat spacecraft developed by EADS-Astrium. The ability to understand and reliably predict such interactions is of utmost importance as they may involve energy transfer between modes and, in turn, jeopardise the structural integrity. The paper proceeds in two steps, leading to great-fidelity reproductions of the experimental observations. In the first step, sine-sweep data collected during the qualification campaign are exploited to build a nonlinear computational model of the SmallSat with good predictive capabilities. To this end, the complete progression through nonlinearity detection, characterisation and parameter estimation is carried out by means of several techniques, such as the wavelet transform and the restoring force surface method. In the second step, the computational model is exploited through continuation algorithms to compute the nonlinear normal modes of the spacecraft and predict potential interactions. A very good agreement between experimental and numerical results is obtained for 2:1 interactions between modes with non-commensurate linear frequencies. [less ▲]

Detailed reference viewed: 20 (7 ULg)
Full Text
Peer Reviewed
See detailBatch enzymatic interesterification of fat blends using microwave
Danthine, Sabine ULg; Simon, C.; Richel, Aurore ULg et al

Poster (2014, September)

Detailed reference viewed: 9 (2 ULg)
Full Text
Peer Reviewed
See detailEffect of AMF enrichment with 13C-­‐triacylglycerol tracers on its thermal and structural behavior
Danthine, Sabine ULg; Vors, C.; Michalski, M-C

Poster (2014, September)

Detailed reference viewed: 10 (0 ULg)
Full Text
See detailEvaluation of Temocillin for treatment of nosocomial infections
LAYIOS, Nathalie ULg; CIUTEA, Mirela ULg; LONGUEVILLE, Manon et al

Poster (2014, September)

Detailed reference viewed: 6 (1 ULg)
Full Text
Peer Reviewed
See detailThe puzzling new class of variable stars in NGC 3766 : old friend pulsators?
Salmon, Sébastien ULg; Montalban Iglesias, Josefa ULg; Reese, Daniel et al

in Astronomy and Astrophysics (2014), 569

The recent variability survey of the NGC 3766 cluster revealed a considerable number of periodic variable stars in a region of the H-R diagram where no pulsation is expected. This region lies between the ... [more ▼]

The recent variability survey of the NGC 3766 cluster revealed a considerable number of periodic variable stars in a region of the H-R diagram where no pulsation is expected. This region lies between the instability strips of the delta Scuti and SPB stars. Moreover the periods of the new phenomenon, P~0.1-0.7 d, do not allow to associate it a priori to either of these two types of pulsations. Stars in the NGC 3766 cluster are known as fast rotators with rotational velocities typically larger than half of their critical velocity. Rotation can affect both the geometrical properties and period domain of pulsations. It also alters the apparent stellar luminosity through gravity darkening, effect seldom taken considered in theoretical studies of the rotation-pulsation interaction. We explore if both of these effects are able to deliver a consistent interpretation for the observed properties of the "new variables" in NGC 3766: explaining their presence outside the known instability strips and their variability periods. We carry out an instability analysis of SPB models within the framework of the Traditional Approximation of Rotation and study the visibility of modes according to the angle of view and rotation. We also check how gravity darkening affects the effective temperature and luminosity of stellar models for different angles of view and rotation velocities. At the red (cold) border of the instability strip, prograde sectoral modes are preferentially excited and their visibilities are maximum when seen equator-on. Furthermore low-mass SPB models seen equator-on can appear in the gap between non-rotating SPB and delta Scuti stars due to gravity darkening. In that case, periods of these most visible modes are shifted to the 0.2-0.5 d range due to the effects of the Coriolis force. We hence suggest that the new variable stars observed in NGC 3766 are actually fast rotating SPB pulsators. [less ▲]

Detailed reference viewed: 12 (7 ULg)