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See detailRénover ou réformer la fiscalité du logement en Wallonie
Xhignesse, Guillaume ULg

in Revue Générale de Fiscalité [= RFG] (2014)

Cette contribution a pour objectif de stimuler la discussion relative à la réforme de la fiscalité du logement en Belgique, et plus particulièrement en Wallonie. Nous y évoquons quelques enjeux d'une ... [more ▼]

Cette contribution a pour objectif de stimuler la discussion relative à la réforme de la fiscalité du logement en Belgique, et plus particulièrement en Wallonie. Nous y évoquons quelques enjeux d'une telle réforme et nous proposons diverses pistes de réflexions. [less ▲]

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See detailL'enfant placé au carrefour de ses appartenances
Aubinet, Suzanne ULg

Poster (2014, May)

Michard (2009) nous dit de la loyauté qu’elle est l’armature de l’appartenance et à Neuburger de souligner qu’en plus d’être un socle sur lequel l’identité se structure, l’appartenance contient et limite ... [more ▼]

Michard (2009) nous dit de la loyauté qu’elle est l’armature de l’appartenance et à Neuburger de souligner qu’en plus d’être un socle sur lequel l’identité se structure, l’appartenance contient et limite les effets des relations (2003). Pour Onnis (2008) c’est dans la dialectique entre identité et appartenance que naît l’individualité qui, elle, se réalise dans la relation (Dolto, 1988). Plymackers (2006) insiste sur les notions d’espaces où se nouent ces relations mais aussi de temps où ces dernières se jouent. L’enfant, par des mouvements dialectiques d’allées et venues avec son/ses système(s) d’appartenances tisse pas à pas les prémices de son identité. Ses relations structurent et étayent ce processus et la temporalité constitue le squelette de celui-ci. Mais qu’en est-il de ces enfants placés, maltraités, déplacés ? Qu’en est-il si le conflit ou le clivage de loyauté entre famille(s) et institution(s) rend l’étayage de l’appartenance ardu ? Qu’en est-il si la discontinuité des espaces et des relations prédomine et si le processus d’individuation est suspendu par une séparation arbitraire dictée par un autrui qui « n’appartient pas » ? L’analyse clinique de cas d’enfants aux vécus chaotiques rythmés par de nombreux placements nous permet de décortiquer les particularités de ce processus complexifié par ces ruptures d’espaces, ces loyautés morcelées, ces appartenances diffuses et d’en cerner les impacts. [less ▲]

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See detailOne-year follow-up of platelet-rich plasma to treat chronic upper patellar tendinopathies
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; Bruyère, Olivier ULg et al

in European Journal of Physical and Rehabilitation Medicine (2014, May), 50(Suppl. 1 to No. 3), 227250-

Introduction: Infiltration of PRP may be used as a recent therapeutic option for chronic tendinopathies The aim of the current study is to evaluate the clinic and the return to sports activities in ... [more ▼]

Introduction: Infiltration of PRP may be used as a recent therapeutic option for chronic tendinopathies The aim of the current study is to evaluate the clinic and the return to sports activities in patients with chronic upper patellar tendinopathies 1 year after 1 infiltration of PRP. Material and methods: The follow-up of 20 subjects who beneficed from 1 infiltration of PRP was made before infiltration, after 3 months and 1 year after infiltration; it was made as follow: VAS, IKDC and VISA-P scores. Moreover, they had to answer an information questionnaire concerning their life and sports activities. Results: Seventy percents of patients reported a favourable evolution with decrease of pain, 10% did never report any improvement and 20% were treated surgically. Eighty-seven percents returned to sports activities without any pain, and 50% of them recovered the same sport level. VAS has significantly (p<0.0001) dropped, IKDC significantly improved (p=0.0007) and VISA-P also significantly increased (p=0.0087) over the follow-up of 1 year. Discussion: This study confirms that a local injection of PRP coupled with a program of eccentric rehabilitation through a chronic Jumper's knee, improves painful symptoms and the functionality of the subjects’ knee up to a follow-up of 1 year. [less ▲]

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See detailA new methodological approach for error distributions selection in Finance
Hambuckers, julien ULg; Heuchenne, Cédric ULg

E-print/Working paper (2014)

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the ... [more ▼]

In this article, we propose a robust methodology to select the most appropriate error distribution candidate, in a classical multiplicative heteroscedastic model. In a first step, unlike to the traditional approach, we don't use any GARCH-type estimation of the conditional variance. Instead, we propose to use a recently developed nonparametric procedure (Mercurio and Spokoiny, 2004): the Local Adaptive Volatility Estimation (LAVE). The motivation for using this method is to avoid a possible model misspecification for the conditional variance. In a second step, we suggest a set of estimation and model selection procedures (Berk-Jones tests, kernel density-based selection, censored likelihood score, coverage probability) based on the so-obtained residuals. These methods enable to assess the global fit of a given distribution as well as to focus on its behavior in the tails. Finally, we illustrate our methodology on three time series (UBS stock returns, BOVESPA returns and EUR/USD exchange rates). [less ▲]

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See detailInitiation à la papyrologie documentaire. Note du cours de Jean A. Straus
Straus, Jean ULg

Learning material (2014)

Manuel de papyrologie documentaire

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See detailProtecting Assets Under Non-Parametric Market Conditions
Choffray, Jean-Marie ULg; Pahud de Mortanges, Charles ULg

E-print/Working paper (2014)

Under non-parametric market conditions, investors usually become more concerned about the return of their money than about the return on their money. Protecting assets becomes the surest if not the only ... [more ▼]

Under non-parametric market conditions, investors usually become more concerned about the return of their money than about the return on their money. Protecting assets becomes the surest if not the only path to survival and growth. High frequency trading systems, over leveraged shadow entities, flash crashes, and stealth central bank actions, to name a few, contribute to create a “Rumsfeldian” type of world in which decision makers have to cope not only with “Known knowns” – things they know that they know – but also with “Unknown unknowns” – things they don’t know that they don’t know! The goal of this paper is to explore such a conceptual model of the “Unknown” and to derive from it a concise and coherent set of battle-tested heuristics aimed at designing effective investment strategies to protect assets. [less ▲]

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See detailCapillary-driven bi-dimensional buoyancy in vertical soap films
Adami, Nicolas ULg; Caps, Hervé

in Europhysics Letters [=EPL] (2014)

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See detailAdolescents et délinquance : Quelles représentations de la sexualité et de la pornographie, pour quelle sexualité ?
Puglia, Rosa ULg; Glowacz, Fabienne ULg

Conference (2014, May)

Bien que la pornographie ne soit pas un phénomène nouveau, ses supports, ses modalités d’accès, son public, etc. se sont vus modifiés suite à l’avènement des nouvelles technologies. Ainsi, de nos jours ... [more ▼]

Bien que la pornographie ne soit pas un phénomène nouveau, ses supports, ses modalités d’accès, son public, etc. se sont vus modifiés suite à l’avènement des nouvelles technologies. Ainsi, de nos jours, les adeptes de ce média peuvent d’un simple clic visionner une variété d’images et de films à caractère pornographique de manière anonyme et gratuite. Alors que de nombreuses questions se posent quant à l’influence de ces médias sur le développement psycho-sexuel et sur les conduites des adolescents, peu d’études y ont été consacrées. Avant de considérer la population délinquante, il était important d’évaluer la consommation pornographique dans une perspective développementale auprès d’une population d’adolescents. Nos recherches se sont centrées, d‘une part sur l’impact de l’accessibilité et de la visualisation de ces médias au niveau des représentations de la sexualité et de la pornographie, et d’autre part, sur l’influence de la consommation pornographique au niveau du développement psycho-sexuel et des pratiques sexuelles des adolescents. Une enquête a été menée auprès de 319 jeunes (150 filles) comprenant, en plus des items se rapportant à la sexualité et la pornographie, plusieurs tests évaluant des dimensions du fonctionnement psychologique et social (test de solitude, recherche de sensation, relations aux pairs, délinquance auto-révélée,... ). Des entretiens semi-directifs ainsi que les différents tests ont été proposés à 20 adolescents délinquants judiciarisés. Nos résultats mettent en évidence que la consommation pornographique influence les représentations (et réciproquement) et certains aspects des pratiques sexuelles des jeunes. Il ressort également que les adolescents délinquants (auto-révélés et judiciarisés) apparaissent comme plus vulnérables par rapport aux sollicitations de ces médias. [less ▲]

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See detailVerso il fuorigioco. Una squadra di storie sul calcio
Curreri, Luciano ULg; Comberiati, Daniele

Book published by Il Foglio (2014)

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See detailStructured reflection breaks embedded in an online course – Effects on learning experience, time on task and performance
Verpoorten, Dominique ULg; Westera, Wim

in Interactive Learning Environments (2014)

The purpose of this paper is to gain insight into the effects of practicing short, frequent and structured reflection breaks interspersed with the learning material in a computer-based course. To that end ... [more ▼]

The purpose of this paper is to gain insight into the effects of practicing short, frequent and structured reflection breaks interspersed with the learning material in a computer-based course. To that end, the study sets up a standardised control trial with 2 groups of secondary-school pupils. The study shows that, while performance is not affected by these embedded “reflection rituals”, they significantly impact time on task and perceived learning. The study also suggests that the exposure to such built-in opportunities for reflection modifies the engagement with the content and fosters the claimed readiness for application of a similar reflective approach to learning in other occasions. [less ▲]

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See detailTest equipments for characterizing the behavior of materials, bearings and dynamic seals in cryogenic fluid environments
Bozet, Jean-Luc ULg; Servais, Christophe ULg; Duquenne, Marc ULg et al

in Space Propulsion 2014 (2014, May)

Test rigs available at the cryogenic test site of the University of Liège concern quite delicate high rotational speed components of cryogenic rocket engines. That is to say bearings and dynamic seals ... [more ▼]

Test rigs available at the cryogenic test site of the University of Liège concern quite delicate high rotational speed components of cryogenic rocket engines. That is to say bearings and dynamic seals. These rigs gave successfully important results for the understanding and the improvement of the running of the so called components. Until now the test zone is equipped for handling liquid oxygen and liquid nitrogen. [less ▲]

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See detailTransiting hot Jupiters from WASP-South, Euler and TRAPPIST: WASP-95b to WASP-101b
Hellier, Coel; Anderson, D. R.; Collier Cameron, A. et al

in Monthly Notices of the Royal Astronomical Society (2014)

We report the discovery of the transiting exoplanets WASP-95b, WASP-96b, WASP-97b, WASP-98b, WASP-99b, WASP-100b and WASP-101b. All are hot Jupiters with orbital periods in the range 2.1-5.7 d, masses of ... [more ▼]

We report the discovery of the transiting exoplanets WASP-95b, WASP-96b, WASP-97b, WASP-98b, WASP-99b, WASP-100b and WASP-101b. All are hot Jupiters with orbital periods in the range 2.1-5.7 d, masses of 0.5-2.8 MJup and radii of 1.1-1.4 RJup. The orbits of all the planets are compatible with zero eccentricity. WASP-99b produces the shallowest transit yet found by WASP-South, at 0.4 per cent. The host stars are of spectral type F2-G8. Five have metallicities of [Fe/H] from -0.03 to +0.23, while WASP-98 has a metallicity of -0.60, exceptionally low for a star with a transiting exoplanet. Five of the host stars are brighter than V = 10.8, which significantly extends the number of bright transiting systems available for follow-up studies. WASP-95 shows a possible rotational modulation at a period of 20.7 d. We discuss the completeness of WASP survey techniques by comparing to the HATnet project. [less ▲]

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See detailL'intensification des procédés chimiques, une approche radicale
Henneuse, Catherine; Monbaliu, Jean-Christophe ULg

Article for general public (2014)

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See detailL'immatériel en droit international privé - approche belge
Wautelet, Patrick ULg

Scientific conference (2014, May)

Ce rapport a été écrit sur base d'un questionnaire rédigé par le Professeur Tristan Azzi dans le cadre des journées internationales de l'Association Henri Capitant (Barcelone/Madrid 2014). Ce rapport ... [more ▼]

Ce rapport a été écrit sur base d'un questionnaire rédigé par le Professeur Tristan Azzi dans le cadre des journées internationales de l'Association Henri Capitant (Barcelone/Madrid 2014). Ce rapport aborde essentiellement deux questions liées à l'immatériel en droit international privé : le contentieux de la propriété intellectuelle et celui lié à l'usage d'internet. [less ▲]

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See detailVitamin D status of schoolchildren in Northern Algeria, seasonal variations and determinants of vitamin D deficiency
Djennane, M; Lebbah, S; Roux, C et al

in Osteoporosis International (2014), 25(5), 1493-502

Summary There are no published data on the vitamin D status of children living in North Africa. In 435 healthy Algerian children 5–15 years old, we found that vitamin D insufficiency (serum 25 ... [more ▼]

Summary There are no published data on the vitamin D status of children living in North Africa. In 435 healthy Algerian children 5–15 years old, we found that vitamin D insufficiency (serum 25-hydroxyvitamin D (25OHD) <50 nmol/L) was frequent, especially in winter. Low vitamin D status was associated with increased parathyroid hormone (PTH) and leg deformation Introduction As there are no published data on the vitamin D status of children living in North Africa, we evaluated the 25OHD concentration of healthy Algerian children at the end of summer and at the end of winter. As secondary objectives, we studied the various determinants of vitamin D status and the PTH-25OHD relationship in these subjects. Methods Four hundred thirty-five children 5–15 years old were examined and had a blood sample in September 2010. Of them, 408 were sampled again in March 2011. Results Median 25OHD concentration in the whole group was 71.4 nmol/L in September and 52.9 nmol/L in March. In September, 58.4, 29.9, and 8.1 % had a 25OHD concentration below 75, 50, and 30 nmol/L respectively. In March, these percentages increased to 65.2, 41.4, and 17.4 % for the 75, 50, and 30 nmol/L threshold, respectively. In multivariate analysis, older age, darker skin phototype, low daily vitamin D and calcium intake, poor socioeconomic status, and short daily sun exposure remained significantly associated with a 25OHD <50 nmol/L at both visits. In 72 (16.6 %) children, genu varum/valgum was present. Compared to the 363 children without leg deformation, they presented more frequently with the risk factors of vitamin D insufficiency. They also had lower 25OHD concentrations and higher PTH and tALP. Serum PTH and 25OHD concentrations were negatively and significantly correlated (r=−0.43; p<0.001) without a 25OHD threshold above which PTH does not decrease anymore. Conclusion Despite a sunny environment, vitamin D insufficiency is frequent in healthy Algerian children. [less ▲]

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See detailLivre et jeu vidéo
Barnabé, Fanny ULg; Dozo, Björn-Olav ULg

Book published by Groupe de Recherche et d’Etude sur le Livre au Québec (2014)

Ce numéro de Mémoires du livre / Studies in book culture explore un domaine encore peu étudié pour lui-même : les rapports entre livre et jeu vidéo. Ceux-ci sont généralement inclus dans des études ... [more ▼]

Ce numéro de Mémoires du livre / Studies in book culture explore un domaine encore peu étudié pour lui-même : les rapports entre livre et jeu vidéo. Ceux-ci sont généralement inclus dans des études intermédiatiques plus larges, mêlant différentes approches sans se focaliser sur les liens – pourtant nombreux, comme le présent dossier le montre – qui se tissent spécifiquement entre ces deux médias. Il faut dire que le déséquilibre de légitimité entre ceux-ci tend à compliquer l’analyse, car le regard qu’une certaine culture lettrée porte généralement sur le jeu vidéo le cantonne dans un rôle de loisir de masse qu’il est de bon ton d’ignorer (comme la bande dessinée avant lui dans les années 1980 et 1990 et les « mauvais genres » paralittéraires encore avant). La question de la légitimité traverse d’ailleurs en filigrane ce dossier. [less ▲]

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See detailSustainable Resource Availability : Ge, Ni, Al three contrasting stories
Pirard, Eric ULg

Conference (2014, May)

The sustainable availability of raw materials used in manufacturing advanced products is a question that consumers will raise more and more in the future. In order to answer this legitimate request it is ... [more ▼]

The sustainable availability of raw materials used in manufacturing advanced products is a question that consumers will raise more and more in the future. In order to answer this legitimate request it is mandatory to define characterization factors capable of taking into account the geological scarcity of an element but also the social and environmental impact of its exploitation and beneficiation. Recent studies (Vieira et al. 2012; Swart el al. 2013) have focused on decreasing ore grades as rough indicators, but clearly such indicators can be severely biased by breakthrough innovations in mining technologies as well as by high metal prices generated by increasing demand. In this paper, we will briefly review three metals that could technically be extracted from very different social and natural environments: Germanium is nowadays mainly a byproduct of coal burnt in China, but could as well be gained from alternative sources such as zinc sulfides. Aluminium is produced from bauxite with Gallium as a byproduct but could technically be extracted from alternative resources such as regionally available clays. Finally, the world nickel production follows two very different processing routes starting either from silicates (laterite deposits) or from sulfides (ultramafic magmas). By comparing the geological; environmental and social impact of mining operations for these three metals, we will try to show what is hidden behind simple ore grades and what indicators should be taken into account in a more complex analysis of sustainable availability. The intention is to build a geographical information system (GIS) of mineral resources and mining operations to help product manufacturers in properly selecting their raw materials providers. Vieira, M.D.M., Goedkoop, M.J., Storm, P. and Huijbregts, M.A.J., 2012, Ore grade decrease as a life cycle impact indicator for metal scarcity : The case of copper. Environ. Sci. Technol. 46, 12772-12778 Swart, P. and Dewulf, J., 2013, Quantifying the impacts of primary metal resource use in life cycle assessment based on recent mining data. Resources, Conservation and Recycling, 73, 180-187. [less ▲]

Detailed reference viewed: 19 (5 ULg)