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See detailWhich are the determinants of homeownership ? A logit analysis for the case of Belgium
Xhignesse, Guillaume ULg; Bianchet, Bruno ULg; Cools, Mario ULg et al

Conference (2014, July)

In market-oriented economies, high rates of homeowners are traditionally associated with positive economic effects and externalities. For this reason, public authorities have encouraged homeownership for ... [more ▼]

In market-oriented economies, high rates of homeowners are traditionally associated with positive economic effects and externalities. For this reason, public authorities have encouraged homeownership for the last decades through taxation or subsidies policies. In Belgium, owner-occupation has been promoted since the end of the nineteenth century and homeownership policy is considered as a key element of the Welfare state. Furthermore, the effectiveness of these policies is fundamentally based on a clear understanding of what determines homeownership. Therefore, the analysis of tenure determinants can provide inputs for the definition or the renewal of housing, taxation and subsidies policies. Considering this interest, this paper investigates the issue of housing tenure in Belgium. On the basis of previous related research, a model of tenure choice is estimated using a sample of 6,962 households. The observations follow clearly the general trends described for other countries. Higher income and age, couple status and the presence of dependent children have positive influences on homeownership. In addition, locations presenting a high density of population and a high centrality are associated with a lower probability of homeownership compared with other areas. The underlying significations of these variables are discussed in the paper. [less ▲]

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See detailMars dayglow review
Stiepen, Arnaud ULg

Conference (2014, July)

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See detailMars aurora review
Stiepen, Arnaud ULg

Conference (2014, July)

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See detailReassessing the Mainstream vs. Alternative/Independent Dichotomy or, the Double Awareness of the Vertigo Imprint
Dony, Christophe ULg

in Dony, Christophe; Habrand, Tanguy; Meesters, Gert (Eds.) La bande dessinée en dissidence / Comics in Dissent (2014)

This article examines how the traditional mainstream vs. alternative/independent dichotomy usually employed to characterize the cultural production of comics in the US may have become outdated, and ... [more ▼]

This article examines how the traditional mainstream vs. alternative/independent dichotomy usually employed to characterize the cultural production of comics in the US may have become outdated, and perhaps even obsolete, when considering and analyzing the editorial policies and ideological agenda of Vertigo, DC’s adult-oriented imprint. More specifically, this essay sheds light on how Vertigo engages in a critical, ironic, and sometimes ambiguous discourse with both the history of the medium and staple practices and traditions from the mainstream and alternative wings of the American comics production. In so doing, I maintain that Vertigo is characterized by a hybrid identity and has developed a “double awareness” that allows it to appeal to both mainstream and alternative audiences. Vertigo’s hybridity, however, is not devoid of cultural, political, and even sociological implications that upset the categories of reception and production structuring the field of American comics. These implications underlying both the hybrid character of the label and its concomitant politics of demarcation in regards to the mainstream/alternatve dialectic will first be explored through the label’s obsession with processes of rewriting and recuperation, and second, through a close-reading of some of Vertigo promotional books’ covers. [less ▲]

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See detailHighly dispersed iron xerogel catalysts for p-nitrophenol degradation by photo-Fenton effects
Mahy, Julien ULg; Tasseroul, Ludivine ULg; Zubiaur, Anthony ULg et al

Poster (2014, July)

Since the beginning of the industrial era, the various human activities have increased steadily, leading to a rapid technological development and a high population growth. Thus, the expansion of the ... [more ▼]

Since the beginning of the industrial era, the various human activities have increased steadily, leading to a rapid technological development and a high population growth. Thus, the expansion of the industry has heavily polluted the atmosphere, soil and water with negative consequences for humans and environment [1]. To decrease this pollution, it exists various treatment methods: chemical, physical and biological [2,3]. Among all these methods, a recent way of treatment is the degradation of pollutants in soils or waters by Fenton and photo-Fenton reactions [3] which use H2O2, iron-based compounds and UV light. In this way, several Fe2O3/SiO2 xerogel catalysts were synthesized by cogelation method by hydrolysis and condensation of tetraethoxysilane (TEOS) and 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS) which is able to form a chelate with iron ions [4]. Five samples were synthesized: four samples with different percentage of iron (0.5, 1, 1.5 and 2.5 theoretical wt% confirmed by ICP-AES measurements), and a sample of pure silica. TEM pictures, nitrogen adsorption-desorption and mercury porosimetry measurements have established that EDAS plays a role of nucleating agent of silica particles [5,6] and allows to anchor iron particles inside silica network [4]. Indeed, it results iron nanoparticles of diameter 1-1.5 nm encapsulated in silica particles with sizes of about 10-30 nm in diameter. The species of iron was determined by Mössbauer spectroscopy and only Fe3+ ions were observed in xerogel catalysts. Then, the Fenton and photo-Fenton effect of these catalysts were evaluated on the degradation of p-nitrophenol (PNP) in aqueous medium in different conditions. Results show that Fe2O3/SiO2 xerogels present a photo-Fenton effect with H2O2, reaching with a sample 99 % of degradation after 24 h. [1] M. A. Khan, A. M. Ghouri, Environmental pollution: its effects on life and its remedies, Journal of Arts, Science & Commerce (Vol. 2), 2011, pg 276-285. [2] M. S. Kuyukina , I. B. Ivshina, Biology of rhodococcus: chapter 9, Springer, 2010, pg 232-256. [3] J. J. Pignatello, E. Oliveros, A. MacKay, Advanced Oxidation Processes for Organic Contaminant Destruction Based on the Fenton Reaction and Related Chemistry, Critical Reviews in Environmental Science and Technology (Vol. 36), 2006, pg 1-84. [4] B. Heinrichs, L. Rebbouh, J.W. Geus, S. Lambert, H.C.L. Abbenhuis, F. Grandjean, G.J. Long, J.-P. Pirard, R.A. van Santen, Iron (III) species dispersed in porous silica through sol-gel chemistry, Journal of Non-Crystalline Solids (Vol. 354), 2008, pg 665-672. [5] S. Lambert, C. Alié, J.-P. Pirard, B. Heinrichs, Study of textural properties and nucleation phenomenon in Pd/SiO2 , Ag/SiO2 and Cu/SiO2 cogelled xerogel catalysts, Journal of Non-Crystalline Solids (Vol. 342), 2004, pg 70-81. [6] B. Heinrichs, S. Lambert , N. Job , J.-P. Pirard, in "Catalyst Preparation: Science and Engineering, J. R. Regalbuto (Ed.)", CRC Press, Taylor & Francis Group, Boca Raton, 2007, p. 163-208. [less ▲]

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See detailFatigue index reproducibility in isokinetic testing
Paulus, Julien ULg; Croisier, Jean-Louis ULg; Bosquet, Laurent et al

in De Haan, Arnold; De Ruiter, Jo; Tsolakidis, Elias (Eds.) Book of abstracts (2014, July)

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See detailSmart Grid Energy Flexible Buildings through the use of Heat Pumps in the Belgian context
Georges, Emeline ULg; Masy, Gabrielle; Verhelst, Clara

in 3rd International High Performance Buildings Conference at Purdue (2014, July)

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See detailMémoire à ciel ouvert. Une histoire de l’Espagne : 1931-1981
Molina Marmol, Maïté ULg; Muñoz, Ángeles

Book published by Territoires de la Mémoire (2014)

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See detailLa bande dessinée en dissidence : alternative, indépendance, auto-édition / Comics in Dissent: Alternative, Independence, Self-Publishing
Dony, Christophe ULg; Habrand, Tanguy ULg; Meesters, Gert

Book published by Presses Universitaires de Liège (2014)

This volume investigates the complex notion of dissent as it can be applied to contemporary comics in confronting field and market logic, legitimation strategies, and social, cultural, political and ... [more ▼]

This volume investigates the complex notion of dissent as it can be applied to contemporary comics in confronting field and market logic, legitimation strategies, and social, cultural, political and aesthetic discourses. How do artists and/or publishing structures distance themselves from a certain idea of the established order? In what ways do they challenge the existing systems and environments in which they operate? How can we characterize the many guises and sometimes conflicting objectives of a generally self-conscious (counter-)culture? And what kinds of symbolic exchanges can we observe between artistic and critical discourses? These are some of the questions that the here gathered essays explore in considering the practices and strategies of either so-called and/or selfproclaimed independent or alternative comics artists or publishers. [less ▲]

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See detailIntroduction (version française)
Dony, Christophe ULg; Habrand, Tanguy ULg; Meesters, Gert

in Dony, Christophe; Habrand, Tanguy; Meesters, Gert (Eds.) La bande dessinée en dissidence : alternative, indépendance, auto-édition / Comics in Dissent: Alternative, Independence, Self-Publishing (2014)

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See detailIntroduction (English version)
Dony, Christophe ULg; Habrand, Tanguy ULg; Meesters, Gert

in Dony, Christophe; Habrand, Tanguy; Meesters, Gert (Eds.) La bande dessinée en dissidence : alternative, indépendance, auto-édition / Comics in Dissent: Alternative, Independence, Self-Publishing (2014)

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See detailWhen children stop trusting what they have perceived
Geurten, Marie ULg; Willems, Sylvie; Meulemans, Thierry ULg

in Neuropsychological Rehabilitation Special Interest Group of the WFNR - Conference Programme (2014, July)

Background and aims: A common hypothesis to explain metamemory heuristics learning throughout childhood lies on the assumption that the knowledge underlying these metacognitive rules develop from people’s ... [more ▼]

Background and aims: A common hypothesis to explain metamemory heuristics learning throughout childhood lies on the assumption that the knowledge underlying these metacognitive rules develop from people’s prior day-to-day experiences. However, the specific processes that sustain this learning are still unclear. In this study, we examined the mechanisms implicated in this empirical development by manipulating the learned interpretation of the Easily Learned = Easily Remembered (ELER) heuristic through an implicit process involving the detection of environmental regularities. Method: A sample of sixty normally developing children aged 4-5, 6-7, and 8-9 years old was recruited for this study. Each child participated in three 60-minute sessions separated approximately by one-week interval and was trained to learn implicitly a reverse interpretation of the ELER heuristic. The influence of executive functions on children’s judgment of learning at posttest was also investigated. Results: In addition to an early development of the ELER heuristic, results revealed a reduction of this heuristic’s use after the implicit training in the two youngest groups. Furthermore, executive monitoring was demonstrated to account for the lack of change observed in older children after the training phases. Conclusions: In a developmental perspective, these findings present a coherent picture of children’s learning of metacognitive heuristics. Specifically, automatic and implicit learning was demonstrated to be followed by an effortful control of the heuristics’ use. [less ▲]

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See detailDroplet synchronization in multiple interconnected parallel channels
Van Loo, Stéphanie ULg; Stoukatch, Serguei ULg; Gilet, Tristan ULg

Poster (2014, July)

In droplet microfluidics, the pairing of droplets in parallel channels is sometimes required, e.g. to control their encounter and to promote their coalescence. Prakash and Gershenfeld [1] showed that ... [more ▼]

In droplet microfluidics, the pairing of droplets in parallel channels is sometimes required, e.g. to control their encounter and to promote their coalescence. Prakash and Gershenfeld [1] showed that passive synchronization could be achieved with bubbles in a ladder-like channel network. Bubbles flow in the rails and induce recirculation in the interconnecting rungs, which supposedly provides the feedback and subsequent synchronization. Ahn et al. recently extended this study to trains of droplets in flow-rate-driven conditions [2]. We here present an extensive experimental and theoretical investigation of droplets synchonization in multiple parallel channels. Droplets are produced with independent flow-focusing structures. Several experimental conditions are tested, including several geometries (and subsequent flow resistance) and inlet conditions (pressure-driven vs. flow-rate-driven). An extension to three rails is also considered. The microfluidic chips are designed with the help of a lumped-element model in which droplets are driven by the flows. [1] M. Prakash and N. Gershenfeld, Science 2007, 315, 832-835 [2] Ahn et al., Lab-on-a-chip, 2011, 11, 3956-3962 [less ▲]

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See detail« Sémiotique de l’action : textualisation et notation »
Dondero, Maria Giulia ULg

in CASA - Cadernos de Semiótica Aplicada (2014), 12(1), 15-57

Our essay focuses on some methodological issues concerning the semiotic analysis of practice. We will initially retrace the debate about the epistemological relationship between text and action, outlining ... [more ▼]

Our essay focuses on some methodological issues concerning the semiotic analysis of practice. We will initially retrace the debate about the epistemological relationship between text and action, outlining the forms of enunciative praxis through different levels of pertinence analysis. Secondly, we propose the concept of ‘textualization’ as a mediation between text and action: textualizations (photographs, videos, notes) organize and represent practices which are in themselves ephemeral and elusive. Finally, we will consider the textual diagrammatization that we call ‘notation’: this analytical form of mediation between text and practice does not have the same status of in-vivo textualisations, but it works like an ex-post reconstruction which highlights the main gestures and exchanges while performing their grammaticalization. A more general aim of this essay is an enquiry into the legitimate objects of textual semiotics: what are the objects that it can analyze without betraying its principle of immanence, but also without being confined to it and, as a consequence, being unable to analyze practices and respond to topical questions on social issues and on the research in the human sciences? [less ▲]

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See detailMathematical modeling of HIV dynamics after antiretroviral therapy initiation: A clinical research
Moog, Claude; Rivadeneira, Pablo; Stan, Guy-Bart et al

in AIDS Research and Human Retroviruses (2014)

Immunological failure is identified from the estimation of certain parameters of a mathematical model of the HIV infection dynamics. This identification is supported by clinical research results from an ... [more ▼]

Immunological failure is identified from the estimation of certain parameters of a mathematical model of the HIV infection dynamics. This identification is supported by clinical research results from an original clinical trial. Standard clinical data were collected from infected patients starting Highly Active Anti-Retroviral Therapy (HAART), just after one month following therapy initiation and were used to carry out the model identification. The early diagnosis is shown to be consistent with the patients monitoring after six months. [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)

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 detailTHE NORDIC TEST SYSTEM FOR VOLTAGE STABILITY ASSESSMENT
Van Cutsem, Thierry ULg

Conference (2014, July)

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See detailEarly Prediction of Transient Voltage Sags caused by Rotor Swings
Weckesser, Tilman; Johannsson, Hjortur; Van Cutsem, Thierry ULg

in Proc. IEEE PES general meeting (2014, July)

The paper investigates various methods to predict voltage sags at load buses caused by large generator rotor swings and following a transient disturbance. Three different prediction methods are proposed ... [more ▼]

The paper investigates various methods to predict voltage sags at load buses caused by large generator rotor swings and following a transient disturbance. Three different prediction methods are proposed, which all use real-time measurements from PMUs. One of the methods uses a slightly extended version of the E-SIME method. The other two methods use measurements and process them by recursive least square estimation. It is shown that the prediction method employing E-SIME allows the earliest detection of a critical voltage sag with satisfactory accuracy. [less ▲]

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See detailLe regard cosmopolite et rétrospectif de la bande dessinée alternative
Dejasse, Erwin ULg

in Dony, Christophe; Habrand, Tanguy; Meesters, Gert (Eds.) La bande dessinée en dissidence / Comics in Dissent Alternative, indépendance, auto-édition / Alternative, Independence, Self-Publishing (2014)

When critically exploring alternative comics, the various actors participating in the processes of legitimization of the form — including print and broadcast media, festivals, scholars and fans — often ... [more ▼]

When critically exploring alternative comics, the various actors participating in the processes of legitimization of the form — including print and broadcast media, festivals, scholars and fans — often privilege a handful of people (Sfar, Trondheim, Ware, Satrapi,…), a small number of publishers (especially L’Association), a few particular formats such as the “graphic novel,” emblematic genres (the memoir and autobiography), or certain geographical areas such as France and/or the United States. And yet, the phenomenon of alternative comics may take a multitude of forms and is resolutely international in scope. Despite this diversity, alternative comics worldwide nevertheless share common objectives. They notably include the challenging of two of the most common critical stances directed against a multitude of “traditional” publishers, namely : their inclination towards ethnocentricity and their cultivation of amnesia. Far from sweeping away the history of the form, alternative comics artists and publishers alike attach great value to the past of the medium and generally embrace it. [less ▲]

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See detailOn the convergence of relaxation schemes to couple phasor-mode and electromagnetic transients simulations
Plumier, Frédéric ULg; Geuzaine, Christophe ULg; Van Cutsem, Thierry ULg

in Proceedings of the IEEE PES General Meeting (2014, July)

Hybrid simulations combining phasor-mode and electromagnetic transients models aim at taking advantage of computational speed of the former and accuracy of the latter. For simulation accuracy, a ... [more ▼]

Hybrid simulations combining phasor-mode and electromagnetic transients models aim at taking advantage of computational speed of the former and accuracy of the latter. For simulation accuracy, a relaxation process is used, which consists of iterating between both models. The convergence properties of this relaxation process are investigated. The speed of convergence is assessed when the variables exchanged at the interface between both models are respectively pure voltage/current sources, Norton/Thévenin equivalents, or a combination of them. Iteratively updated Norton/Thévenin equivalents are shown to drastically reduce the number of relaxation iterations. [less ▲]

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