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See detailControl of molecular dynamics with zero-area fields. application to molecular orientation and photodissociation
Sugny, Dominique; Vranckx, Stéphane; Ndong, Mamadou et al

in Physical Review A (2014), 90

The constraint of time-integrated zero area on the laser field is a fundamental requirement, both theoretically and experimentally, in the control of molecular dynamics. By using techniques of local and ... [more ▼]

The constraint of time-integrated zero area on the laser field is a fundamental requirement, both theoretically and experimentally, in the control of molecular dynamics. By using techniques of local and optimal control theory, we show how to enforce this constraint in two benchmark control problems, namely, molecular orientation and photofragmentation. The origin and the physical implications for the dynamics of this zero-area control field are discussed. [less ▲]

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See detailPhotoelectric Conversion Effect in Non-Photovoltaic Photorefractive Materials
Frejlich, Jaime; De Oliveira, Ivan; Carvalho, Jesiel et al

in Latin America Optics & Photonics Conference (LAOP) - OSA Technical Digest (online) (2014, November)

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See detailLes stratégies industrielles de valorisation de la biomasse végétale en Région Wallonne
Richel, Aurore ULg

Conference (2014, November)

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les ... [more ▼]

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les matières premières disponibles pour le bioraffinage de 1ère et 2ème générations sont listées sur base des données accumulées par les équipes de Gembloux Agro-Bio Tech. Les avantages et limitations de ces matières premières sont décrits. Les technologies de conversion commercialisables sont proposées en fonction des contraintes socio-économiques de la Wallonie: bioraffineries autonomes, intégrées, etc. Divers exemples de réalisations commerciales ou en prototypes sont proposés, de même que certains projets de R&D dans ce domaine. [less ▲]

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See detailL'intellectuel critique aujourd'hui
Hamers, Jérémy ULg; Cormann, Grégory ULg; Englebert, Jérôme ULg et al

Article for general public (2014)

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See detailDon / Langage / Contretemps. Diagonales giovannangeliennes. Actes de la rencontre autour du travail de Daniel Giovannangeli. Université Saint-Louis Bruxelles, 2 mai 2014
Gavray, Marc-Antoine ULg; Gély, Raphaël; Richard, Sébastien

in Bulletin d'Analyse Phénoménologique (2014), 10(11),

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See detailThe phycologist Pierre Compère: his contribution to cyanobacterial studies
Golubic, Stjepko; Wilmotte, Annick ULg

in Plant Ecology and Evolution (2014), 147(3), 307-310

At the occasion of the 80th birthday of Pierre Compère, his rich career as a phycologist and cyanobacteriologist is placed in the context of the advances of the scientific theories, the evolution of the ... [more ▼]

At the occasion of the 80th birthday of Pierre Compère, his rich career as a phycologist and cyanobacteriologist is placed in the context of the advances of the scientific theories, the evolution of the cyanobacterial taxonomy and the nomenclatural discussions linked to the utilization of two different Codes of nomenclature. [less ▲]

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See detailStochastic modelling of reservoir sedimentation in a semi-arid watershed
Adam, Nicolas; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Water Resources Management (2014)

Sedimentation in large reservoirs is a major concern in semi-arid regions characterized by severe seasonal water scarcity. As a contribution to improved sediment management, this study analyses the real ... [more ▼]

Sedimentation in large reservoirs is a major concern in semi-arid regions characterized by severe seasonal water scarcity. As a contribution to improved sediment management, this study analyses the real case of the reservoir of Sidi Yacoub in the north of Algeria. First, a dynamic model of the reservoir was set up and used to estimate past water and sediment inflows (period 1990-2010) based on data recorded by the dam operator and measurements at a gauging station located downstream of the reservoir. Second, in a stochastic framework using the statistical characteristics of inflow and outflow discharges, a projection of future sedimentation was performed until 2030, assuming stationarity of the statistical distributions. Third, the model was used to investigate the influence of possible climate change and to quantify the positive effects of soil conservation measures upstream. [less ▲]

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See detailIon mobility-mass spectrometry to perform structural classifications of disulfide-bridged-peptides
Massonnet, Philippe ULg; Upert, Gregory; Morsa, Denis ULg et al

Poster (2014, November)

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See detailIntroduction aux BPF/GMP : Chapitre 2 Personnel
Marini Djang'Eing'A, Roland ULg

Learning material (2014)

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See detailProjections graphiques de quelques espaces de la vie sociale au Japon
Badir, Sémir ULg

in Lexia (2014), 17-18

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See detailPoints d'appui
Jacquemain, Marc ULg

in SociologieS (2014)

L'article discute un grand résumé de Jan Spurk. Il met le doigt sur la contradiction dans ce "grand résumé" entre l'assomption que je le "je" est au coeur du capitalisme contemporain et le fait de confier ... [more ▼]

L'article discute un grand résumé de Jan Spurk. Il met le doigt sur la contradiction dans ce "grand résumé" entre l'assomption que je le "je" est au coeur du capitalisme contemporain et le fait de confier au sujet la tâche de l'émancipation de ce même capitalisme. Il propose de relever, dans différents courants de la littérature contemporaine de sciences sociales, les éléments qui plaident pour un "sujet" doté d'une capacité empirique de résistance au capitalisme. [less ▲]

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See detailBook Review: Ralf Brand and Sarah Fregonese 2013: The Radicals’ City: Urban Environment, Polarisation, Cohesion. Surrey: Ashgate.
Farah, Jihad ULg

in International Journal of Urban and Regional Research (2014), 38(6),

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See detailQue devient la narration lorsqu’elle prend place dans un jeu vidéo ?
Barnabé, Fanny ULg

Article for general public (2014)

Les jeux vidéo sont-ils capables de prendre en charge la narration d’une histoire, au même titre que la littérature ou le cinéma ? Le jeu est-il fondamentalement narratif, ou le récit n’y joue-t-il qu’un ... [more ▼]

Les jeux vidéo sont-ils capables de prendre en charge la narration d’une histoire, au même titre que la littérature ou le cinéma ? Le jeu est-il fondamentalement narratif, ou le récit n’y joue-t-il qu’un rôle d’arrière-plan, de décoration ? Cette question constitue, dans le milieu de la recherche, une clef d’entrée privilégiée pour interroger les œuvres vidéoludiques en tant que produits culturels. Elle est également au centre de l’ouvrage "Narration et jeu vidéo. Pour une exploration des univers fictionnels", qui vient de paraître aux éditions Bebooks. [less ▲]

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

Conference (2014, November)

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 detailLes forces de la négation dans l’image
Dondero, Maria Giulia ULg

in Acquarelli, Luca (Ed.) Au prisme du figural. Le sens des images entre forme et force (2014)

Ce texte vise à décrire un type particulier de forces inhérentes à la configuration de l’image. Il s’agit de forces qui mettent en crise la figuration et le caractère affirmatif de l’image, en les ... [more ▼]

Ce texte vise à décrire un type particulier de forces inhérentes à la configuration de l’image. Il s’agit de forces qui mettent en crise la figuration et le caractère affirmatif de l’image, en les détournant et en les rendant « hésitants ». Nous souhaitons démontrer que l’image n’est pas contrainte d’affirmer ce qu’elle met en scène : elle a également la capacité de le nier. La négation par l’image représente à nos yeux un défi majeur pour les sémioticiens du visuel et les théoriciens de l’art, notamment dans le cadre de recherches sur le langage de l’image, le métalangage visuel et, plus généralement, sur les capacités de l’image à développer un discours autonome par rapport au discours verbal [less ▲]

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See detailCeramic Materials for Dental Prostheses
MAINJOT, Amélie ULg

in Biomaterials (2014)

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See detailStress and singing accuracy: What is the relationship?
Larrouy, Pauline ULg

Conference (2014, October 31)

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will ... [more ▼]

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will have an influence on vocal accuracy. In addition, the quality of a musical performance can be lessened or enhanced if the performer experiences stressful conditions. In order to clarify the effects of stress on singing accuracy and to explore solutions to favor the positive consequences of stress, we ran an experiment in collaboration with the Royal Conservatory of Liège. Thirty-one music students were asked to learn a simple melody. There were then recorded in a stressful condition (i.e., a music examination) and a non-stressful condition. Two groups were defined according to the challenge level of the music examination (first and second music levels). Measurements were made by self-reported state anxiety (CSAI-2R questionnaire) and by observing heart rate activity (electrocardiogram) during each performance. In addition, the vocal accuracy of the sung performances (in terms of respect of melodic contour, precision of intervals and respect of the tonality) was objectively analyzed. As expected, state anxiety and heart rate were significantly higher on the day of the music examination than in the non-stressful condition for all the music students. However, the effect of stress was positive for the first-year students but negative for the second-year students, for whom the music examination was particularly challenging. In addition, highly significant correlations were found between the intensity of cognitive symptoms and the vocal accuracy criteria. This study highlights the contrasting effects of stress on singing voice accuracy. The results encourage searchers to take into account the stress level of the performer when evaluating singing accuracy. In addition, it seems pertinent to work on the perception of somatic and cognitive symptoms in higher music institutions and to try to diminish the stress level of students, in order to favor the positive consequences of stress on the quality of musical performances. Thanks to this method, we are actually focusing on studies designed to better understand the effects of stress on speaking voice. [less ▲]

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