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See detailOù il est question de se faire une idée juste de la réalité... (partie 1)
Bruyère, Olivier ULg

in Medi-Sphere (2014), 454

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See detailRac1 GTPase silencing counteracts microgravity-induced effects on osteoblastic cells.
Guignandon, Alain; Fauré, Céline; Neutelings, Thibault et al

in FASEB Journal (2014), 28(9), 4077-4087

Bone cells exposed to real microgravity display alterations of their cytoskeleton and focal adhesions, two major mechanosensitive structures. These structures are controlled by small GTPases of the Ras ... [more ▼]

Bone cells exposed to real microgravity display alterations of their cytoskeleton and focal adhesions, two major mechanosensitive structures. These structures are controlled by small GTPases of the Ras homology (Rho) family. We investigated the effects of RhoA, Rac1, and Cdc42 modulation of osteoblastic cells under microgravity conditions. Human MG-63 osteoblast-like cells silenced for RhoGTPases were cultured in the automated Biobox bioreactor (European Space Agency) aboard the Foton M3 satellite and compared to replicate ground-based controls. The cells were fixed after 69 h of microgravity exposure for postflight analysis of focal contacts, F-actin polymerization, vascular endothelial growth factor (VEGF) expression, and matrix targeting. We found that RhoA silencing did not affect sensitivity to microgravity but that Rac1 and, to a lesser extent, Cdc42 abrogation was particularly efficient in counteracting the spaceflight-related reduction of the number of focal contacts [-50% in silenced, scrambled (SiScr) controls vs. -15% for SiRac1], the number of F-actin fibers (-60% in SiScr controls vs. -10% for SiRac1), and the depletion of matrix-bound VEGF (-40% in SiScr controls vs. -8% for SiRac1). Collectively, these data point out the role of the VEGF/Rho GTPase axis in mechanosensing and validate Rac1-mediated signaling pathways as potential targets for counteracting microgravity effects [less ▲]

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See detailFrom fair milk to fair enterprise: the consequences of an unexpected "bricolage"
Feyereisen, Marlène ULg; Melard, François ULg

in Outlook on Agriculture (2014), 43(3), 207-211

In recent years, the European Union and the Common Agricultural Policy have made considerable changes in policy related to the dairy sector. After two successive dairy crises in 2009 and 2012, the dairy ... [more ▼]

In recent years, the European Union and the Common Agricultural Policy have made considerable changes in policy related to the dairy sector. After two successive dairy crises in 2009 and 2012, the dairy sector in Belgium was weakened considerably. The Belgian fair-trade milk enterprise, Fairebel, was created by dairy farmers a few months after the 2009 European milk crisis, seeking to develop their alternative, supported, owned by and for traditional dairy farmers. This case study brings into question ‘fair trade’ as a concept and practice in terms of trade between enterprises in Europe, and the surprise effects of interaction when analysed at both European and regional scales. The study concludes that the best innovation processes are not necessarily radical, and that tinkering – or bricolage – is the path taken by many innovations. [less ▲]

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See detailTowards enhanced estimates of future water demand in the Meuse basin: literature review
De Cuyper, Anaïs; Bruwier, Martin ULg; Archambeau, Pierre ULg et al

Report (2014)

With respect to water management in the Meuse basin, the hydrological consequences of climate change have been taken into account in several studies so far; but this is not the case of many other ... [more ▼]

With respect to water management in the Meuse basin, the hydrological consequences of climate change have been taken into account in several studies so far; but this is not the case of many other environmental and socio-economic changes, including trends in future water demand. The objective of this report is to serve as an onset for the development of a first approach to estimate at a relatively large-scale future water demand in the Meuse basin. Based on a review of recent literature, this report discusses the key drivers which influence water demand, with the aim of identifying the most suitable methods to implement in a subsequence more detailed analysis, as well as to highlight the data needs. [less ▲]

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See detailPhysical Therapists’ Knowledge, Attitudes, and Beliefs about Physical Activity: A Prerequisite to their Role in Physical Activity Promotion?
Mouton, Alexandre ULg; MUGNIER, Benoît ULg; Demoulin, Christophe ULg et al

in Journal of Physical Therapy Education (2014), 28(3), 120-127

Background. The promotion of physical activity (PA) is widely recognized as a major component of the prevention and management of several chronic diseases. As experts in human movement, physical ... [more ▼]

Background. The promotion of physical activity (PA) is widely recognized as a major component of the prevention and management of several chronic diseases. As experts in human movement, physical therapists (PTs) are logical agents for the promotion of PA. Nevertheless, to date only few studies have investigated factors that influence PA promotion. Objectives. This study aimed to analyze the relationships between physical therapist knowledge, attitudes, and beliefs about PA, and their own selfreported PA promotion. Design. A sample of 185 PTs (male = 102) completed a cross-sectional survey through an online questionnaire. It included 25 multiple choice, Likert scale, and open-ended questions related to (1) personal characteristics, (2) knowledge, attitudes, and beliefs about PA, and (3) self-reported PA promotion by PTs. A deductive and inductive content analysis of the openended questions was also performed. Results. The questionnaire revealed that 99% of PTs agreed (n = 30) or completely agreed (n = 154) with the fact that they have to contribute to PA promotion in their patients. Significant correlations were found between physical therapist knowledge of the definition of PA, the benefits of PA, and their self-reported PA promotion (0.251, P < .01 and 0.180, P < .05, respectively). Additional multivariate analysis of the predictors of the self-reported PA promotion exposed significant univariate effects of knowledge, attitudes, and beliefs about PA (P < .01). Conclusion. Although the role of PTs in PA promotion seems evident, this survey underlines important misconceptions about PA within this group of health care professionals. Significant relationships between physical therapist knowledge, attitudes, and beliefs about PA and self reported promotion of PA highlight the need for physical therapist education programs to emphasize teaching the fundamentals of PA. [less ▲]

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See detailEstimating the out-of-sample predictive ability of trading rules: a robust bootstrap approach
Hambuckers, julien ULg; Heuchenne, Cédric ULg

E-print/Working paper (2014)

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being ... [more ▼]

In this paper, we estimate the out-of-sample predictive ability of a set of trading rules. Usually, this ability is estimated using a rolling-window sample-splitting scheme, true out-of-sample data being rarely available. We argue that this method makes a poor use of the available information and creates data mining possibilities. Instead, we introduce an alternative bootstrap approach, based on the .632 bootstrap principle. This method enables to build in-sample and out-of-sample bootstrap data sets that do not overlap and exhibit the same time dependencies. We illustrate our methodology on IBM and Microsoft daily stock prices, where we compare 11 trading rules specifications. For the data sets considered, two different filter rule specifications have the highest out-of-sample mean excess returns. However, all tested rules cannot beat a simple buy-and-hold strategy when trading at a daily frequency. [less ▲]

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See detailConservation et biodiversité animale en Afrique centrale
Vermeulen, Cédric ULg; Linchant, Julie ULg

in Delvingt, Willy; Vermeulen, Cédric; Lebrun, Philippe (Eds.) et al La recherche dans les aires protégées d'Afrique centrale. Parcs et Réserves 69 (3). (2014)

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See detail"Pro Patria". La réponse belge face au martyre de son patrimoine durant la Première Guerre mondiale
Rusch, Arnaud ULg

in Costa, Sandra; Pizzo, Marco (Eds.) Le muse ferite (1914-1918): fotografia storica e percezione del patrimonio (2014)

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See detailLa recherche dans les aires protégées d'Afrique centrale
Delvingt, Willy; Vermeulen, Cédric ULg; Lebrun, Philippe et al

Book published by Ardenne et Gaume asbl (2014)

- Les drones au secours de la grande faune menacée de RDC - Les Gorilles du Parc National de Lobéké, (Cameroun) : Utilisation de l’habitat et Implications pour la conservation - Conservation de l ... [more ▼]

- Les drones au secours de la grande faune menacée de RDC - Les Gorilles du Parc National de Lobéké, (Cameroun) : Utilisation de l’habitat et Implications pour la conservation - Conservation de l'hippopotame commun (Hippopotamus amphibius) au Parc National des Virunga: population actuelle et mesures de protection - Politique(s) des aires protégées au Cameroun : impératifs écologiques, besoins socio-économiques et routines politiciennes - La Réserve de Faune de Lomako Yokokala en République Démocratique du Congo: une réserve méconnue. [less ▲]

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See detailImpact d'un module de formation à l'arbitrage sur l'implicaiton des bénévoles dans le volley-ball
Van Hoye, Martin ULg; Roulin, Céline; Cloes, Marc ULg

in Revue de l'Education Physique (2014), 54(3), 68-77

En raison du manque de bénévoles dans les clubs de volley-ball, les clubs doivent trouver des solutions. Dans cette étude, nous avons proposé un module de formation à l'arbitrage afin d'impliquer des ... [more ▼]

En raison du manque de bénévoles dans les clubs de volley-ball, les clubs doivent trouver des solutions. Dans cette étude, nous avons proposé un module de formation à l'arbitrage afin d'impliquer des parents, des amis et des joueurs d'autres équipes dans la gestion de matches. [less ▲]

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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 ▲]

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See detailApplication of X-ray microtomography to investigate the effect of raw material properties on the kinetics of iron ores granulation
Contreras, Rafael; Evrard, Maxime ULg; Van loo, Frederic et al

in PSA 2014 Manchester- Abstracts (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 ▲]

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See detailOn the Elasto-viscoplastic behavior of the Ti5553 alloy
ben bettaieb, Mohamed; Van Hoof, Thibaut; Pardoen, thomas et al

in Materials Science & Engineering : A (2014), 617

The elastoviscoplastic behavior of the Ti533 alloy is characterized and compared to the classical Ti-6A14V alloy. The true stress-strain curves are determined based on tensile tests performes under ... [more ▼]

The elastoviscoplastic behavior of the Ti533 alloy is characterized and compared to the classical Ti-6A14V alloy. The true stress-strain curves are determined based on tensile tests performes under different strain rates at room temperature and at 150°C, from which the elastic constants and the parameters of a Norton-Hoff viscoplastic model are identified. The strength of the Ti5553 alloy is 20-40% higherthan the strength of the Ti-6A1-4V alloy. The Ti5553 alloy constitutes thus a promising candidate for advanced structural applications. In view of modeling structural applications of forming operations, the elastic and plastic initial anisotropy of the two alloys is investigated by combining compression on cylinders with elliptical sections, uniaxial tensile tests in different material directions , plane strain and shear tests. The initial anisotropy of the different alloys is very weak which justifies the modeling of the mechanical behavior with isotropic yield surface. The identified elastoviscoplastic model is validated by comparing experimental results with FE predictions both on cylindrical specimens subjected to tensile tests and on flat specimens subjected to plane strain conditions. [less ▲]

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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 ▲]

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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 ▲]

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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 ▲]

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See detailTransfusion in aortic surgery
KOCH, Jean-Noël ULg

Conference (2014, September)

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See detailRetrospective study of ventilation after major aortic surgery
KOCH, Jean-Noël ULg

Conference (2014, September)

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