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See detailRobust impact design of steel and composite building structures
Hoffman, Nadine; Kuhlmann, Ulrike; Demonceau, Jean-François ULg et al

in Proceeding of the IABSE Workshop - Safety, Robustness and Condition Assessments of Structures (2015, February)

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See detailSignes et jouabilité : l’interface comme outil de ludicisation
Barnabé, Fanny ULg

in Interfaces Numériques (2015), 4(1),

As shown by the recent works on the subject (Rao, 2008 ; Simonnot, 2008 ; all papers presented at the symposium Game and playability in the digital age), researchers now seem to agree on the fact that the ... [more ▼]

As shown by the recent works on the subject (Rao, 2008 ; Simonnot, 2008 ; all papers presented at the symposium Game and playability in the digital age), researchers now seem to agree on the fact that the digital has an intrinsic playability (it is “ludogenic” according to Vial, 2012) and that this property is not uninvolved with the current spread of the “gamification” or “ludification” (Genvo, 2011) phenomenons. Following these considerations, this paper aims to examine a specific angle of this privileged relationship between digital and game, namely the fundamental role played by the interfaces (both graphical and physical). We will try to demonstrate through various examples the deeply playable nature (I.e suitable to set off a playful attitude) of the different kinds of interface, but also to examine its causes: is there a structural basis that could explain this affinity with the play? With this aim in mind, theories of game (playful attitude) will be intersected with interface theories in order to demonstrate the existence of many similarities. The hypothesis that guides this work is that this transitional device’s playability owes more to its semiotic nature than to its belonging to digital. Indeed, as a system of signs, the interface has two characteristics that make it fit to generate a playful attitude in the user: the metaphoric distance and the increase of possible actions. [less ▲]

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See detailEffect of iron nanoparticles synthesized by a sol-gel process on Rhodococcus erythropolis T902.1 for biphenyl degradation
Wannoussa, Wissal; Masy, Thibaut ULg; Lambert, Stéphanie ULg et al

in Journal of Water Resource and Protection (2015), 7

Nanoparticles (NPS) are considered as a new generation of compounds to improve environmental remediation and biological processes. The aim of this study is to investigate the effect of iron NPS ... [more ▼]

Nanoparticles (NPS) are considered as a new generation of compounds to improve environmental remediation and biological processes. The aim of this study is to investigate the effect of iron NPS encapsulated in porous silica (SiO2) on the biphenyl biodegradation by Rhodococcus erythropolis T902.1 (RT902.1). The iron NPS (major iron oxide FexOy form) were dispersed in the porosity of a SiO2 support synthesized by sol-gel process. These Fe/SiO2 NPS offer a stimulating effect on the biodegradation rate of biphenyl, an organic pollutant that is very stable and water-insoluble. This positive impact of NPS on the microbial biodegradation was found to be dependent on the NPS concentration ranging from 10−6 M to 10−4 M. After 18 days of incubation the cultures containing NPS at a concentration of 10−4 M of iron improved RT902.1 growth and degraded 35% more biphenyl than those without NPS (positive control) or with the sole SiO2 particles. Though the microorganism could not interact directly with the insoluble iron NPS, the results show that about 10% and 35% of the initial 10−4 M iron NPS encapsulated in the SiO2 matrix would be incorporated inside or adsorbed on the cell surface respectively and 35% would be released in the supernatant. These results suggest that RT902.1 would produce siderophore-like molecules to attract iron from the porous silica matrix. [less ▲]

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See detailIncreased tree-growth synchronization of beech (Fagus sylvatica L.) in response to climate change in northwestern Europe
Latte, Nicolas ULg; Lebourgeois, François; Claessens, Hugues ULg

in Dendrochronologia (2015), 33

To better understand how the radial growth of beech (Fagus sylvatica L.) high forests has responded to climate change, we selected 12 sites (137 trees) with optimal growing conditions along a W − E ... [more ▼]

To better understand how the radial growth of beech (Fagus sylvatica L.) high forests has responded to climate change, we selected 12 sites (137 trees) with optimal growing conditions along a W − E altitudinal gradient (67–590 m) in Belgium. We evaluated temporal changes in growth response to climate by using pointer year analysis, moving mean sensitivities (1860–2011), and moving bootstrapped correlation coefficients (1952–2011). The strongest driving climatic variables were identified by using the partial least squares method. The common patterns of growth trends, pointer years, and mean sensitivities among sites provided evidences for the impact of environmental changes operating at a regional scale. The results of growth–climate analysis indicated that these changes were strongly influenced by the climatic conditions of the previous year. The climate sensitivity of beech increased progressively in response to more frequent and intense heat waves and warming-related droughts, especially during recent decades, leading to remarkable inter-site synchronization. The changes were much more pronounced for sites located in lowlands (<300 m). The differences in growth responses along the altitudinal gradient and the consequences of warming for beech growth and physiology are discussed. [less ▲]

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See detailEarly detection of university students in potential difficulty
Hoffait, Anne-Sophie ULg; Schyns, Michael ULg

Conference (2015, February)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by ... [more ▼]

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by early identifying students who have a high probability to face difficulties if nothing is done, the Universities might develop adapted methods to attack the problem with more emphasis where it is more needed and when it is still possible. Thus we want to develop a decision tool able to identify these students to help them. For that, we consider three standard datamining methods: logistic regression, artificial neural networks and decision trees and focus on early detection, i.e. before starting at the University. Then, we suggest to adapt these three methods as well as the classification framework in order to increase the probability of correct identification of the students. In our approach, we do not restrict the classification to two extreme classes, e.g. failure or success, but we create subcategories for different levels of confidence: high risk of failure, risk of failure, expected success or high probability of success. The algorithms are modified accordingly and to give more weight to the class that really matters. Note that this approach remains valid for any other classification problems for which the focus is on some extreme classes; e.g. fraud detection, credit default... Finally, simulations are conducted to measure the performances of the three methods, with and without the suggested adaptation. We check if the factors of success/failure we can identify are similar to those reported in the literature. We also make a ``what-if sensitivity analysis''. The goal is to measure in more depth the impact of some factors and the impact of some solutions, e.g., a complementary training or a reorientation. [less ▲]

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See detailSecreto de confesión
Ceballos Viro, Alvaro ULg

Article for general public (2015)

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See detailThe Late Viséan Rugose coral association of NW Turkey
Denayer, Julien ULg

Conference (2015, February)

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See detailRugose corals from the Carboniferous of the eastern Tafilalt (Morocco): a progress report
Aretz, Markus; Denayer, Julien ULg

Conference (2015, February)

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See detailFrequency support among asynchronous AC systems through VSCs emulating power plants
Papangelis, Lampros ULg; Guillaud, Xavier; Van Cutsem, Thierry ULg

in Proc. 11th IET Conference on AC and DC Power Transmission (2015, February)

This paper proposes a new control scheme for the Voltage Source Converters (VSCs) of a High Voltage Direct Current (HVDC) grid connecting asynchronous AC systems, so that the latter can mutually support ... [more ▼]

This paper proposes a new control scheme for the Voltage Source Converters (VSCs) of a High Voltage Direct Current (HVDC) grid connecting asynchronous AC systems, so that the latter can mutually support their frequencies after a disturbance. The scheme involves no communication between VSCs. It is activated upon detection of a significant frequency deviation, with the possibility to limit the support requested from other AC systems. It relies on an integral control enforcing the frequency droop characteristics (of classical speed governors), in addition to the voltage-droop control of VSCs. The controller is tuned to emulate the response of a power plant, while avoiding excessive transients in the HVDC system, and limiting the impact on the other AC systems. [less ▲]

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See detailSingle-Molecule Force Spectroscopy on Synthetic Helical Nanoarchitectures
Devaux, Floriane ULg; Duwez, Anne-Sophie ULg; Huc, Ivan et al

Poster (2015, February)

Foldamers are artificial folded molecular architectures inspired by the structures and functions of natural biopolymers. Folding is the process selected by nature to control the conformation of its ... [more ▼]

Foldamers are artificial folded molecular architectures inspired by the structures and functions of natural biopolymers. Folding is the process selected by nature to control the conformation of its molecular machinery to carry out chemical functions and mechanical tasks, such as en-zyme catalysis, duplication in nucleic acids, force generation,... During the last decade of research on foldamers [1], synthetic oligomers able to adopt well-defined and predictable folded conformations, such as helices, have been proposed. Recent progress has shown that stepwise chemical synthesis and molecular design based on aromatic oligoamide backbones enable to produce large helically folded molecular architectures. The shape and stiffness of the backbone, local conformational preferences, specific interactions between distant monomers in sequences, as well as the action of external parameters such as the solvent or the presence of ions, can be combine to induce folding tendency. A remarkable aspect of these architectures is that they can give rise to folded patterns that have no in natural counterparts biopolymer structures. For instance, helices whose diameter varies along the se-quence, helices possessing a handedness inversion centre, herringbone helices have been reported. The objective of the project is to synthesize various helical nanorchitectures based on an oli-goamide aromatic backbone and to obtain a detailed picture of their dynamical conformation in solution, as well as, their mechanochemical properties, by AFM-based single molecule force spectroscopy. It is worth mentioning that an important sub-objective of this project is to probe intramolecular interactions in small synthetic molecules with the AFM. Indeed, whereas single-molecule force spectroscopy on macromolecules (proteins and synthetic polymers) is widely exploited[2], implementing single-molecule force spectroscopy on small molecules, such as the foldamers proposed here, remains a major challenge[3]. [1] For a review, see G. Guichard and I. Huc, Chem. Commun. 2011, 47, 5933–5941. [2]E. M. Puchner, H. E.Gaub, Curr. Opin. Struct. Biol. 2009, 19, 605–614. [3]P. Lussis, A.-S. Duwez, Nature Nanotech. 2011, 6, 553-557 [less ▲]

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See detailSpatial distribution of income tax concessions for owner-occupied housing in Belgium: still an incentive for suburban development?
Xhignesse, Guillaume ULg

Scientific conference (2015, February)

In Belgium, public authorities have considerably supported owner-occupied housing since the end of the nineteenth century, notably through tax concessions. The mechanism studied in this paper (in force ... [more ▼]

In Belgium, public authorities have considerably supported owner-occupied housing since the end of the nineteenth century, notably through tax concessions. The mechanism studied in this paper (in force for mortgages taken out from 2005 to 2014) allows households to deduct at marginal taxation rate an annually-limited amount of mortgage repayments for their owner-occupied home, including interests and capital under an aggregated form. In this paper, we emphasize the spatial distribution of this tax concession. To this aim, we use a sample of 34,132 geolocated tax returns (income 2010). Our results show that suburban areas benefit far more from this mechanism than urban areas, mainly because most of the beneficiaries live in these areas. In addition, we observe also that the benefits go for the most part to middle-to-high income families. We hypothesize that this tax relief acts as a catalyst in the spatial sorting of the population on the basis of socio-economic characteristics [less ▲]

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See detailReprésentations et expérience des pères « primipares » de l’allaitement maternel : lien avec la durée de l’allaitement
Noirhomme-Renard, Florence ULg; Michèle, Close; Gosset, Christiane ULg

in Journal de Pédiatrie et de Puériculture (2015), 28(1), 7-15

ntroduction. — This study aim to investigate fathers experiences and representations in regard to breastfeeding. Methods. — Two groups of fathers were recruited in the year following the birth of their ... [more ▼]

ntroduction. — This study aim to investigate fathers experiences and representations in regard to breastfeeding. Methods. — Two groups of fathers were recruited in the year following the birth of their child: a group whose child was breastfed less than three months (n = 16), and the other whose child was breastfed more than 6months (n=17). They were interviewed by semi-structured interviews and completed a questionnaire of attitudes toward child feeding (IIFAS). Results. — Although the representation that had fathers of breastfeeding during pregnancy dif- fered somewhat between the two groups, medical and social factors are primarily associated with a short AM: medical complications in the mother or the child, social vulnerabilities, early breastfeeding difficulties. The involvement of health professionals has been mentioned by many fathers when breastfeeding difficulties, but it has, in most cases, led to the failure of AM in time. Increased fathers take place in the triad, sometimes modulated by their partner, and their emo- tional involvement and practice in breastfeeding are associated with long AM. Fathers whose baby was breastfed for more than 6 months have a score more in favor of breastfeeding on the scale IIFAS. Conclusion. — The inclusion of fathers in the comprehensive model of the determinants of breastfeeding provides further insight to the factors already identified. [less ▲]

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See detailCROSSROADS le magazine sonore des musiques africaines-américaines
Sacré, Robert ULg

Diverse speeche and writing (2015)

Programme radio hebdomadaire consacré aux musiques africaines-américaines ; FM 100.1 ; streaming : www.equinoxefm.be ; podcast : www.mixcloud.com/robertsacre9

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See detailBLUES ALL DAY LONG- The Jimmy Rogers story - compte rendu
Sacré, Robert ULg

in ABS Magazine (2015), (45 Février 2015), 15

Biographie de Jimmy Rogers par Wayne Everett Goins

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See detailJewel BROWN - Le joyau Texan ( traduction)
Sacré, Robert ULg

Article for general public (2015)

Interview de la chanteuse texane Jewel BROWN par Roger WOOD

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See detailDe- and Re-Institutionalizing Technology Assessment in Contemporary Knowledge-Based Economies
Delvenne, Pierre ULg; Charlier, Nathan ULg; Rosskamp, Benedikt ULg et al

in Technikfolgenabschätzung - Theorie und Praxis (2015), 24(1), 130

This article illuminates the potential role of technology assessment (TA) in knowl- edge-driven science, technology and inno- vation (STI) regimes by providing a compar- ative review of Flemish and ... [more ▼]

This article illuminates the potential role of technology assessment (TA) in knowl- edge-driven science, technology and inno- vation (STI) regimes by providing a compar- ative review of Flemish and Walloon TA. It draws critical attention to the ways in which TA actors and institutes in Flanders and Wal- lonia position themselves, or are positioned, in relation to dominant innovation policies and large-scale political transformations, notably the convergence of STI around the knowledge-based economy (KBE) and the regionalization of STI policy in Belgium. The article’s findings shed light on the Flemish government’s recent decision to close its parliamentary TA institute and the institution- al expansion of TA in Wallonia and elsewhere in Europe. It argues that TA has politics, as TA in Flanders and Wallonia aligns with the advent of strategic science and is also affil- iated to specific political parties. As these considerations run counter to the dominant representation of TA as a neutral governance tool that serves the needs of all STI decision makers, they draw into question the viability and utility of TA within contemporary KBEs. [less ▲]

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