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See detailRéappropriation et réapparition. Survivances de Vertigo
Mélon, Marc-Emmanuel ULg

Conference (2010, May)

Detailed reference viewed: 88 (20 ULg)
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See detailThe assessment of the past decades based on modelling and data analysis: some examples
Grégoire, Marilaure ULg; Gorsky, G.; Sesame participants, .

Conference (2010, May)

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See detailTime integration of finite rotations in flexible multibody dynamics using Lie group integrators
Bruls, Olivier ULg; Cardona, Alberto

Conference (2010, May)

Detailed reference viewed: 9 (2 ULg)
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See detailRecent developments in optimization of flexible components of multibody systems
Duysinx, Pierre ULg; Emonds-Alt, Jonathan; Virlez, Geoffrey ULg et al

Conference (2010, May)

Recently mechanical engineering has extended from a component to a system oriented approach. The structural analysis of components is now completed by the whole mechanical system simulation using ... [more ▼]

Recently mechanical engineering has extended from a component to a system oriented approach. The structural analysis of components is now completed by the whole mechanical system simulation using multibody system analysis. This evolution aims at capturing better the real loading conditions accounting for the component interaction and couplings in the system. Structural optimization is continuing along the same tracks. Recent works in structural optimization have tried to optimize components with respect to loadings conditions defined through dynamic loading coming from multibody system dynamic analysis. Generally, optimization techniques consider that the structural component is isolated from the rest of the mechanism and use simplified quasi-static load cases to mimic the complex loadings in service. In contrast, we have shown in previous works devoted to topology optimization that an optimization directly based on the dynamic response of the flexible multibody system leads to a more integrated approach. In order to overcome the limitations of some previous approaches, a more integrated optimization technique is proposed here, based on the nonlinear finite element approach for flexible multibody systems. The non linear finite element formalism accounts for both large rigid-body motions and elastic deflection of the structural components. In previous work, the optimal design of components was realized as an optimal truss / beam layout. The present communication investigates the optimal design of components considered as a continuum medium. We study first sizing optimal design of structural components and we later extend the method to optimal material distribution approach to address their lay out optimization. The continuum domain is discretized into finite elements. For sizing optimization, the design variables are wall-thickness and lumped element variables. For topology optimization the design variables are classically density-like parameters associated to a power law interpolation of effective material properties for intermediate densities, also known as Simply Isotropic Material with Penalization (SIMP). This study assesses the feasibility of this approach, which extends optimization techniques to continuum flexible bodies included in MBS. The numerical implementation is conducted in SAMCEF MECANO for the flexible MBS analysis and BOSS Quattro for the optimization shell. The nonlinear equations of motion are solved using a generalized-a time integration scheme while the sensitivity analysis of mechanical responses is based on a direct differentiation method or finite differences. For sizing and parametric optimization the paper investigates and compares several optimization approaches methods such as classical gradient-based methods (SQP, Augmented lagrangian), sequential convex programming methods (CONLIN, MMA), but also surrogate-based optimization method (with Neural Networks) combined with genetic algorithms. The formulation of the problem is also discussed, and its influence on the convergence history is illustrated. Optimal sizing, shape and topology optimization of a simple model of a robot are addressed. The optimization approach is illustrated on numerical applications of sizing optimization of robot arms during trajectory tracking and lightweight layout optimal design of automotive components. [less ▲]

Detailed reference viewed: 134 (17 ULg)
See detailPenser la justice en contextes islamiques
Nachi, Mohamed ULg

Conference (2010, May)

Inscrire la question de la justice dans les contextes des sociétés islamiques pour en montrer la spécificités et les différentes dimensions sociales, culturelles, politiques, éthiques, etc.

Detailed reference viewed: 18 (0 ULg)
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See detailGRANDS TRAVAUX D’AMENAGEMENT ET MOUVEMENTS DE VERSANT. LE CAS DE TAFFRENT( CONSTANTINOIS, ALGERIE)
Benabbas, Chaouki; Chabour, Nabil; Bourefis, Ahcéne et al

Conference (2010, May)

Detailed reference viewed: 38 (2 ULg)
Peer Reviewed
See detailUne intentionnalité grammaticale chez Wittgenstein
Gauvry, Charlotte ULg

Conference (2010, May)

Detailed reference viewed: 9 (0 ULg)
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See detailMultiparametric observations and analysis in the Bay of Calvi (Corsica), an ideal site for studying the human activity effects and climate changes in the Mediterranean Sea; STARESO
Gobert, Sylvie ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Conference (2010, May)

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed ... [more ▼]

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed in 1969, it is located near Calvi (Corsica, Western Mediterranean Sea) in an oligotrophic area chosen for the exceptional quality of its coastal waters STARESO offers to the oceanographers, by diving or with boats, a direct access to the sea. The variety of the accessible ecosystems is remarkable and unique in the Mediterranean basin: -the Bay of Calvi is characterized by healthy and very diverse biocenosis (e.g. Posidonia meadows, rocky and sandy communities, -a steep submarine canyon, with depths greater than 1 000 meters, is accessible in 15 minutes of navigation; -the Liguro-Provençal front, a major hydrologic structure, is situated between 10 and 15 miles of the coast. STARESO is accessible all the year for everybody and is functioning like an oceanographic research vessel. The Station is a platform for all oceanographic disciplines with a scientific expertise widely based on a long tradition of interdisciplinary work, and a direct access to time series of physical, chemical and biological data registered with automated systems and variety of sensors deployed in the Bay of Calvi since 30 years. This platform provides the opportunity to reach coastal, pelagic, benthic, deep systems with a manageable cost and ship requirements in a pristine zone. [less ▲]

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See detailL'enlèvement international d'enfants- questions choisies
Pfeiff, Silvia ULg

Conference (2010, May)

Detailed reference viewed: 39 (15 ULg)
See detailAbsence of Listeria monocytogenes growth during raw milk cheesemaking: a modelling approach
Jordan, Kieran; Schvartzman Echenique, Maria Sol ULg; Maffre, A et al

Conference (2010, May)

The presence of Listeria monocytogenes in certain foods and the risk that this poses to public health and food quality is still a problem. Currently, the field of food mi- crobiology focuses on obtaining ... [more ▼]

The presence of Listeria monocytogenes in certain foods and the risk that this poses to public health and food quality is still a problem. Currently, the field of food mi- crobiology focuses on obtaining data on the behaviour of microorganisms in food, but the responses obtained provide little insight into the relationship between physiological processes and growth or survival. This link can be made through mathematical models. In a simple form, a mathematical model is a simple mathe- matical description of a process. The application of mathematical models to food microbiology has been developed in recent years and now constitutes a new disci- pline named as Predictive Microbiology. However, most predictive models are based on laboratory experiments in microbiological media under static conditions. As such models tend to be inaccurate, we have undertaken our experiments in a food system under dynamic conditions. Cheese was made with raw and pasteurised milk deliberately contaminated with L. monocytogenes . Listeria was monitored through the manufacture and ripening period of the cheese. The results showed that L. monocytogenes did not grow during manufacture of raw milk cheese, but did grow during manufacture of pasteurised milk cheese. The data obtained for growth, survival and inactivation was modelled. The application of models that can explain the behaviour of Listeria in cheese and the further predictions that can be obtained from these models are useful for the improvement of ongoing re- search on biotraceability and for the better understanding of the general behaviour of these microorganisms under dynamic conditions, such as in dairy products [less ▲]

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See detailPortfolio Theory with Venture Capital
François, Pascal; Hübner, Georges ULg

Conference (2010, May)

This paper studies the contracting choices between an entrepreneur and venture capital investors in a portfolio context. We rely on the mean-variance framework and derive the optimal choices for an ... [more ▼]

This paper studies the contracting choices between an entrepreneur and venture capital investors in a portfolio context. We rely on the mean-variance framework and derive the optimal choices for an entrepreneur with and without the presence of different kinds of venture capitalists. In particular, we show that the entrepreneur always has the incentive to share the risk and benefits of the venture whenever possible. On the basis of their objectives and characteristics, we distinguish the situations of the corporate, independent, and bank-sponsored venture capital funds. Our framework enables us to derive the optimal contract design for the entrepreneur, featuring the choice of investor, the entrepreneur's investment in the venture, and her dilution in the project's equity as a function of her bargaining power. This result allows us to characterize the choice of the investor depending on her cost of equity and debt capital. In addition to project size and risk, entrepreneur's risk aversion turns out to be a critical determinant of VC investor choice -- a finding which is strongly supported by a panel analysis of VC fund flows for 5 European countries over the 2002--2009 period. [less ▲]

Detailed reference viewed: 180 (7 ULg)
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See detailAbscisic acid signal transduction is altered in Arabidopsis plants deficient in plastidial glyceraldehyde- 3-phosphate dehydrogenase
Muñoz-Bertomeu, Jesús; Cascales - Miñana, Borja ULg; Anoman, Armand D. et al

Conference (2010, May)

Detailed reference viewed: 12 (0 ULg)
See detailLa méthode des cas en gestion des ressources humaines
Dujardin, Jean-Marie ULg

Conference (2010, May)

Detailed reference viewed: 41 (14 ULg)
See detailDeterministic and stochastic behaviour of L. monocytogenes suspended cells or detached from stainless steel surfaces during cheese manufacture
Belessi, C; Gounadaki, A; Schvartzman Echenique, Maria Sol ULg et al

Conference (2010, May)

Growth probability and kinetic models for Listeria monocytogenes in response to multiple hurdles occurring during cheese anufacturing are mainly focused on suspended L. monocytogenes cells. This study ... [more ▼]

Growth probability and kinetic models for Listeria monocytogenes in response to multiple hurdles occurring during cheese anufacturing are mainly focused on suspended L. monocytogenes cells. This study aimed to compared: (i) the growth/no growth interface of L. monocytogenes cells attached on stainless steel (SS) surfaces, or in suspension, within adjusted media and (ii) the behavior of planktonic and detached Listeria cells during manufacturing and ripening of two popular Greek cheeses: Feta and Graviera. A multi-strains composite of L. monocytogenes isolates from cheese, factory and farm in Greece and Ireland, were grown in TSBYE, MRD, Milk, Feta and Graviera cheese in the presence of SS coupons (2x5cm) for 3d at 20 °C, to obtain the following inocula: planktonic cells (P), and cells detached from the SS coupons (D). Detachment took place by the bead vortexing method. For growth/no growth evaluation P and D cells were inoculated in TSBYE, adjusted to 5 pH (6.8-4.8) by lactic acid and at 4 aw (0.945-0.995) by NaCl. For evaluation of L. monocytogenes kinetics in cheese, P and D cells were inoculated at three simulated stages of Feta and Graviera manufacture: in pasteurized milk, after cutting the curd and after the first ripening. The growth of D cells slightly delayed compared to P cells while it was more affected by aw than pH. On cheese, L. monocytogenes survived throughout the ripening at low levels. The differences in probability of growth of single cells for both inocula (P and D) were assessed by stochastic approaches. Furthermore, PFGE analysis resulted that 91 % of the cells of any tested condition belonged to the cheese factory isolate. The re- sults may address safety implications relevant to the potential of attached cells to proliferate, whereas data may contribute to filling data gaps on risk assessment of L. monocytogenes isolates from the dairy industry. [less ▲]

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See detailError assessment of sea surface temperature satellite data relative to in situ data: effect of spatial and temporal coverage
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Troupin, Charles ULg et al

Conference (2010, April 30)

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is shown. The aim of this study is to better understand the differences between these ... [more ▼]

A comparison between satellite and in situ sea surface temperature (SST) data in the Western Mediterranean Sea in 1999 is shown. The aim of this study is to better understand the differences between these two data sets, in order to compute merged maps of SST using satellite and in situ data. When merging temperature from different platforms, it is crucial to take the expected RMS error of the observations into account and to correct for possible biases. Different in situ data sensors and platforms (CTD, XBT, drifter, etc) are available for the comparison, each with specificities in the nature of the measurement (accuracy and precision of the measures), and with different spatial and temporal distributions. A comparison with satellite data needs to take these factors into account. Statistics about the differences due to the hour of the day, the month of the year, the type of sensor/ platform used and the spatial distribution is therefore realised through a combination of error measures, diagrams and statistical hypothesis testing. The data used are Advanced Very High Resolution Radiometer (AVHRR) SST day-time and night-time satellite data, and in situ temperature data from various databases (World Ocean Database’05, Coriolis, Medar/Medatlas and ICES). [less ▲]

Detailed reference viewed: 14 (5 ULg)
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See detailDe l'"hermétisme" à l'émancipation: réflexion sur le Mallarmé de Rancière
Pieron, Julien ULg

Conference (2010, April 30)

Detailed reference viewed: 16 (5 ULg)
See detailPoints, chiffres et lettres: la critique des images selon Harun Farocki
Hamers, Jérémy ULg

Conference (2010, April 30)

Detailed reference viewed: 26 (1 ULg)
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See detailFunctions of Binary Variables and Nonlinear 0-1 Optimization
Crama, Yves ULg

Conference (2010, April 29)

Detailed reference viewed: 25 (6 ULg)
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See detailEffect of ground scattering on noise barriers efficiency
Billon, Alexis ULg; Nemerlin, Jean ULg; Embrechts, Jean-Jacques ULg

Conference (2010, April 29)

Noise barriers are popular devices to mitigate the impact of roads or railway noise on the community. So, heavy works have been devoted to improve their efficiency, both through their shapes and their ... [more ▼]

Noise barriers are popular devices to mitigate the impact of roads or railway noise on the community. So, heavy works have been devoted to improve their efficiency, both through their shapes and their building materials. In this work, the effect of ground scattering on the insertion loss created by a straight hard thin screen is investigated using a 1/10th scale model. The ground possesses thus a repetitive structure to induce scattering. Measurements are conducted on both sides of the screen and comparisons are drawn with a flat ground configuration. [less ▲]

Detailed reference viewed: 47 (8 ULg)
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See detailUne éthique de la littérature : Foucault, de Kant à Lacan
Bolmain, Thomas ULg

Conference (2010, April 29)

Detailed reference viewed: 57 (13 ULg)
See detailAntibiotics and pesticides residues in aquaculture products
Scippo, Marie-Louise ULg

Conference (2010, April 28)

Detailed reference viewed: 53 (13 ULg)
Peer Reviewed
See detailGrammatical integration of loanwords in Late Egyptian
Winand, Jean ULg

Conference (2010, April 28)

Detailed reference viewed: 13 (0 ULg)
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See detaill'affranchissement des stéréotypes sexués chez les adolescents comme facteur de meilleure réussite scolaire
Gavray, Claire ULg

Conference (2010, April 27)

les stéréotypes genrés restent significativement ancrés chez les adolescents, et cela plus chez les garçons que chez les filles qui développent de nouvelles façons de penser et d'agir qui s'avèrent ... [more ▼]

les stéréotypes genrés restent significativement ancrés chez les adolescents, et cela plus chez les garçons que chez les filles qui développent de nouvelles façons de penser et d'agir qui s'avèrent payantes d'un point de vue scolaire mais qui sont inégalement réparties entre les groupes sociaux et culturels d'origine. les garçons ont tendance à partager un bon nombre de stéréotypes sexués, quel que soit leur groupe social et culturel, sauf en ce qui concerne la valorisation outrancière du recours à la force pour s'imposer. Celle-ci agit plus souvent en compensation d'une position statutaire et scolaire défavorable et d'un avenir perçu comme bouché et injuste....Elle précipite aussi l'échec en français et la dévalorisation de tout ce qui est perçu comme renvoyant à l'univers féminin.... [less ▲]

Detailed reference viewed: 125 (16 ULg)
See detailLe syndrome néphrotique
Bovy, Christophe ULg; Krzesinski, Jean-Marie ULg

Conference (2010, April 27)

Detailed reference viewed: 21 (2 ULg)
Peer Reviewed
See detailCoptic kata vs Greek κατά: A Case-Study in Contrastive Semantics
Polis, Stéphane ULg

Conference (2010, April 26)

Detailed reference viewed: 15 (0 ULg)
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See detailAnalyse de la marche/course chez le sportif
Kaux, Jean-François ULg

Conference (2010, April 26)

Detailed reference viewed: 124 (12 ULg)
See detailLe cinéma au risque du musée : le spectateur exposé
Thonon, Jonathan ULg

Conference (2010, April 26)

Detailed reference viewed: 14 (0 ULg)
See detailLes troubles bipolaires dans la petite enfance : une sémiologie dimensionnelle du normal au pathologique
Scholl, Jean-Marc ULg

Conference (2010, April 24)

Les médecins confrontés à la petite enfance, particulièrement les neuropédiatres, les pédiatres et les pédopsychiatres, sont en attente de repères sémiologiques précis leur permettant de mieux discriminer ... [more ▼]

Les médecins confrontés à la petite enfance, particulièrement les neuropédiatres, les pédiatres et les pédopsychiatres, sont en attente de repères sémiologiques précis leur permettant de mieux discriminer les difficultés propres de l'enfant. La bipolarité est une affection qui nécessite, plus que d'autres, l'acquisition de meilleurs repères cliniques. Pour répondre à cette attente, la recherche sémiologique présentée dans cet exposé a mis en lumière une sémiologie, non pas catégorielle, mais dimensionnelle, c'est-à-dire une sémiologie précisant chaque micro-signe pour lui-même, et, en le considérant dans un continuum du normale au pathologique. C'est l'intensité de ce signe ou la présence concomitante d'autres signes, qui mettront l'enfant en difficulté ou en souffrance, faisant ainsi passer ce signe vers un aspect pathologique. De plus, cette recherche a tenté de préciser l'évolution développementale de cette sémiologie, en fonction de l'âge. Ainsi, cet exposé aboutit à la description d'une sémiologie très fine de la bipolarité, et à la proposition d'une classification des états bipolaires dans la petite enfance. Il donne également un diagnostic différentiel précis entre Bipolarité et Troubles de l'attention avec ou sans hyperactivité. [less ▲]

Detailed reference viewed: 101 (8 ULg)
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See detailLa pathologie hypothalamo-hypophysaire post-traumatique
VALDES SOCIN, Hernan Gonzalo ULg; Beckers, Albert ULg

Conference (2010, April 24)

Detailed reference viewed: 15 (3 ULg)
See detailOrthodontics and Periodontology
LAMBERT, France ULg

Conference (2010, April 24)

Detailed reference viewed: 5 (0 ULg)
See detailQuand la censure fonctionne à plein régime. Autour de la question algérienne
Sindaco, Sarah ULg

Conference (2010, April 24)

Detailed reference viewed: 5 (0 ULg)
See detailLa salive, une nouvelle matrice alternative en toxicologie
Collart, Anne-Françoise ULg

Conference (2010, April 23)

Detailed reference viewed: 36 (2 ULg)
See detailL’insertion professionnelle des comédiens
Brahy, Rachel ULg; Fraiture, Sébastien ULg; Megherbi, Salim ULg

Conference (2010, April 23)

Detailed reference viewed: 27 (10 ULg)
See detailLe culte moderne de la mémoire : patrimoine et philosophie du soupçon
Dawans, Stéphane ULg

Conference (2010, April 23)

Detailed reference viewed: 26 (4 ULg)
See detailDe la périurbanisation diffuse à la ville compacte qualitative
Halleux, Jean-Marie ULg

Conference (2010, April 23)

Detailed reference viewed: 22 (7 ULg)
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See detailCassandre's results from the Kwalon experiment
Lejeune, Christophe ULg

Conference (2010, April 23)

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Detailed reference viewed: 253 (9 ULg)
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See detailIndéterminations de la photographie (I)
Havelange, Carl ULg

Conference (2010, April 23)

Detailed reference viewed: 15 (9 ULg)
See detailprisons : l'espace privé en question
Tieleman, David ULg

Conference (2010, April 23)

Detailed reference viewed: 31 (5 ULg)
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See detailHigh Multiplicity Scheduling Problems and Just-In-Time Scheduling
Crama, Yves ULg

Conference (2010, April 22)

Detailed reference viewed: 16 (1 ULg)
See detailHypertension
Krzesinski, Jean-Marie ULg

Conference (2010, April 21)

Detailed reference viewed: 10 (2 ULg)
See detailLa recette de cuisine : essai de définition
Colson, Maryse ULg

Conference (2010, April 21)

Detailed reference viewed: 43 (10 ULg)
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See detailAtteintes neurologiques périphériques du pied
Kaux, Jean-François ULg; Wang, François-Charles ULg

Conference (2010, April 20)

Detailed reference viewed: 64 (13 ULg)
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See detailInstabilité de Faraday à l'interface entre mousse et solution
Bronfort, Ariane ULg

Conference (2010, April 20)

Detailed reference viewed: 19 (5 ULg)
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See detailLa force persuasive de l'Idéo-graphie
Leclercq, Bruno ULg

Conference (2010, April 17)

Detailed reference viewed: 17 (0 ULg)
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See detailReconstitution of the journeys to crime and location of their origin in the context of a crime series. A solution for a real case study.
Trotta, Marie ULg; Kasprzyk, Jean-Paul ULg; Donnay, Jean-Paul ULg

Conference (2010, April 15)

Dynamic studies in crime analysis usually use distance-decay models applied on isotropic surfaces. If the distance actually traveled within the context of a crime series can be estimated, another approach ... [more ▼]

Dynamic studies in crime analysis usually use distance-decay models applied on isotropic surfaces. If the distance actually traveled within the context of a crime series can be estimated, another approach, independent of the widely discussed form of the distance decay, can be suggested. Besides, there is a need for studies on anisotropic space, especially in European cities, given their complex road network. Therefore, this study takes this aspect into account. We use data of a real case provided by the Belgian Police Department. Five criminal events have been committed in a short period of time by individuals using the same stolen car before abandoning it. The milometer allowed the Police to estimate the mileage covered by the criminals. The purpose of the analysis is to map out all the possible journeys to crime in order to find the offender's hideout. First, we generate cost surfaces propagated from the locations of the criminal events over the dense road network in a high-resolution raster file. This provides a distance value for all pixels of the potential paths to each crime. Then these distances are cumulated for all criminal events and the sum is confronted to the recorded mileage. This gives a restricted list of road sections from which all event locations can be reached under the constraint of the mileage covered. These results are then refined through a multi-criteria analysis using exogenous data, such as land covers. The small area finally identified contains indeed the hideout as confirmed by the Police Department. [less ▲]

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See detailExpérience et critique. Sur le kantisme de Foucault
Bolmain, Thomas ULg

Conference (2010, April 15)

Detailed reference viewed: 32 (11 ULg)
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See detailL'incidence du temps en matière d'enlèvement international d'enfants
Pfeiff, Silvia ULg

Conference (2010, April 15)

Detailed reference viewed: 19 (3 ULg)
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See detailLésions musculaires particulières
Crielaard, Jean-Michel ULg; Kaux, Jean-François ULg

Conference (2010, April 13)

Detailed reference viewed: 81 (12 ULg)
See detailOXA carbapenemase and their inhibition
Kerff, Frédéric ULg

Conference (2010, April 13)

Detailed reference viewed: 13 (1 ULg)
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See detailNote sur la critique (post)situationniste de Foucault
Bolmain, Thomas ULg

Conference (2010, April 12)

Detailed reference viewed: 30 (10 ULg)
See detailDe la règle institutionnelle à la règle contextuelle. Searle et Wittgenstein
Gauvry, Charlotte ULg

Conference (2010, April 10)

Detailed reference viewed: 7 (0 ULg)
See detailProuver l'inconscient
Gyemant, Maria ULg

Conference (2010, April 10)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailMusique et confraternités nationales à Rome aux XVIe et XVIIe siècles
Corswarem, Emilie ULg

Conference (2010, April 10)

Detailed reference viewed: 9 (1 ULg)
See detailSub sinusal Bone augmentation Procedures: Biological Concept and Surgical Technique
LAMBERT, France ULg

Conference (2010, April 09)

Sinus lift is a valuable procedure allowing implant placement in the posterior maxilla when residual bone height is insufficient. The procedure is nowadays less traumatic with the introduction of ... [more ▼]

Sinus lift is a valuable procedure allowing implant placement in the posterior maxilla when residual bone height is insufficient. The procedure is nowadays less traumatic with the introduction of biomaterials and the development of new surgical protocols. The objective of this lecture is explain the biological concept of sub-antral bone augmentation and to describe the surgical technique according to certain biological principles. Choice of biomaterial, indications, alternatives as well as complications will be envisaged. [less ▲]

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See detailSubstrates and Gate Dielectrics: the Materials Issue for sub-22 nm CMOS Scaling
Caymax, Matty; Bellenger, Florence; Brammertz, Guy et al

Conference (2010, April 08)

Performance scaling of CMOS technologies beyond the 22 nm node will depend on the successful introduction of high mobility materials such as germanium and compound semiconductors on silicon substrates ... [more ▼]

Performance scaling of CMOS technologies beyond the 22 nm node will depend on the successful introduction of high mobility materials such as germanium and compound semiconductors on silicon substrates, which is not straightforward due to important materials incompatibilities. These semiconductors moreover necessitate new gate dielectric materials as the well-proven recipes of “hafnium-based oxides” are not working for various reasons. The lack of a stable, high-quality native oxide for both semiconductors forces materials scientists and device engineers to focus more on the interface rather than on the dielectric material it self. A first part of this paper discusses problems related to the hetero-epitaxial growth of Ge and of III/V materials on Si. By applying a low-high temperature regime, smooth layers of Ge on Si can be obtained. Because of the lattice mismatch, these layers will relax by the formation of misfit dislocations at the interface, combined with threading arms that extend to the surface. The thickness of the layer determines the final density of threading defects, even in case of confined selective growth in windows in a dielectric hard mask, unless specific measures are taken. The polar nature of III/V’s brings about additional problems of anti-phase domain nucleation. This can be solved by providing extra steps on the starting surface in combination with a “pre-deposition” of arsenic. The combination of Ge and III/V selective epitaxy on patterned wafers allows growing confined layers with a low defect density and of high quality. Moreover, by using standard shallow trench isolation as mask, a very natural integration of these materials in standard Si manufacturing can be realized. The second part of this paper deals with the growth of dielectric materials and control of the resulting interfaces. In contrast to the case of Si, both Ge and III/V surfaces are heavily prone to problems with pinning of the surface Fermi level (FLP), which prohibits an efficient control of the channel by varying gate voltages. In the case of Ge, the problem can be solved by decoupling the gate dielectric from the Ge surface by means of an ultra-thin, strained Si epi-layer, after which the well-known gate stack approaches with ALD-grown metal oxides from the Si world can be used. An alternative, promising solution is passivation with thermally grown GeO2 followed by ALD high-k, although this process requires much more care than its Si counterpart. Gate dielectrics on III/V, finally, are probably an even bigger challenge. Apart from the Ga2O+GaGdOx passivation on GaAs, no real solutions of the FLP problem are known. We will discuss the use of sulfur (from thermal treatments with H2S or in the liquid phase with (NH4)2S) in combination with ALD or MBD-grown high-k layers on both GaAs and InGaAs. This will be compared to alternative approaches based on an epitaxially grown interfacial passivation layer of Ge in combination with MBD-grown Al2O3. [less ▲]

Detailed reference viewed: 103 (6 ULg)
See detailNEMA NU1-2001 performance tests of Philips Brightview and Brightview XCT cameras
Seret, Alain ULg

Conference (2010, April 08)

Detailed reference viewed: 159 (3 ULg)
See detailFibril formation by human lysozyme
Dumoulin, Mireille ULg

Conference (2010, April 08)

Detailed reference viewed: 10 (0 ULg)
See detailSub Sinusal Bone augmentation Procedures: Biological Concept and Surgical Technique
LAMBERT, France ULg

Conference (2010, April 07)

Sinus lift is a valuable procedure allowing implant placement in the posterior maxilla when residual bone height is insufficient. The procedure is nowadays less traumatic with the introduction of ... [more ▼]

Sinus lift is a valuable procedure allowing implant placement in the posterior maxilla when residual bone height is insufficient. The procedure is nowadays less traumatic with the introduction of biomaterials and the development of new surgical protocols. The objective of this lecture is explain the biological concept of sub-antral bone augmentation and to describe the surgical technique according to certain biological principles. Choice of biomaterial, indications, alternatives as well as complications will be envisaged. [less ▲]

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See detailIncrement in molecular weight of poly (dimethylamino-ethylmethacrylate) based polymers causes strong red blood cell aggregation but not hemolytic response
Cerda-Cristerna, B.I.; Flores, H; Pozos, A et al

Conference (2010, April 07)

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See detailPlace du dosage de la vitamine D
Cavalier, Etienne ULg

Conference (2010, April 03)

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See detailLa Belgique au futur antérieur: retour sur Bye-Bye Belgium
Claisse, Frédéric ULg

Conference (2010, April 02)

Proposée dans le cadre de journées consacrées aux "controverses scientifiques" du séminaire de Philosophie des sciences de l'ULg, la contribution revient sur l'émission "Bye-Bye Belgium", diffusée par la ... [more ▼]

Proposée dans le cadre de journées consacrées aux "controverses scientifiques" du séminaire de Philosophie des sciences de l'ULg, la contribution revient sur l'émission "Bye-Bye Belgium", diffusée par la RTBF le 13 décembre 2006. L'émission, qui avait alors divisé l'opinion, annonçait, à la faveur d'une "émission spéciale" du journal télévisé présentée par des journalistes de la rédaction (avec la complicité d'hommes politiques belges), l'indépendance unilatérale de la Flandre et la fin de la Belgique. La communication propose de traiter le dispositif de l'émission comme un "simulacre" (forme de critique, sur un mode systématiquement ironique, simulant les caractéristiques de la cible dénoncée) et comme un "futur antérieur" (mode de mise en alerte invitant à imaginer une menace comme déjà survenue, aux fins de la conjurer). "Bye-Bye Belgium" est comparé à "La Guerre des Mondes", particulièrement du point de vue des conventions et indices fictionnels. L'enjeu méthodologique sous-jacent est celui du traitement des codes rhétoriques et pragmatiques dans une controverse, et plus largement des compétences prêtées au destinataire de l'émission. [less ▲]

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See detailSynthesis of regional product activities JRA4-JRA9
Beckers, Jean-Marie ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Conference (2010, April 01)

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See detailCombinatorial Optimization Models in Automated Manufacturing
Crama, Yves ULg

Conference (2010, April 01)

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See detailMicro-controverses : ce qu'elles sont et pourquoi les étudier.
Mormont, Marc ULg

Conference (2010, April 01)

Les micro-controverses sont identifiées comme les points de rencontre entre des systèmes-experts à base scientifique et technique et des pratiques sociales enracinées dans des mondes vécus. Elles méritent ... [more ▼]

Les micro-controverses sont identifiées comme les points de rencontre entre des systèmes-experts à base scientifique et technique et des pratiques sociales enracinées dans des mondes vécus. Elles méritent d'être étudiées pour ce qu'elles révèlent à la fois des limites de la connaissance positive et des capacités des acteurs sociaux à se constituer comme experts. [less ▲]

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Peer Reviewed
See detailStudies on the Interaction of a Novel 6,6¿¿- bis(1,2,4-triazin-3-yl)-,2¿:6¿,2¿¿-terpyridine Ligand with Lanthanide(III) Ions and Americium(III)
Lewis, Frank W.; Harwood, Laurence M.; Hudson, Michael J. et al

Conference (2010, April 01)

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See detailLe changement peut-il être géré ?
Pichault, François ULg

Conference (2010, April 01)

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See detailLes carrières professionnelles des cadres : regard croisé du genre et de l'âge
Grodent, Françoise ULg

Conference (2010, April)

Ce papier a pour objectif de réaliser une revue de littérature qui doit permettre de construire une recherche empirique visant à apporter une vision comparative des carrières des hommes et des femmes ... [more ▼]

Ce papier a pour objectif de réaliser une revue de littérature qui doit permettre de construire une recherche empirique visant à apporter une vision comparative des carrières des hommes et des femmes cadres en regard de trois groupes d’âge : les moins de 35 ans, les [35-50] ans et les plus de 50 ans. Nous considérons les deux sexes étant donné que les trajectoires professionnelles sont influencées par le sexe de la personne ainsi que par les stéréotypes et les rôles qui y sont directement associés (genre). Les générations, quant à elles, nous permettront de tenir compte de l’évolution des facteurs de contexte que sont notamment ces rôles attribués au masculin et au féminin à travers les époques. En effet, les constructions sociales liées au sexe des individus sont susceptibles de changer d’une génération à l’autre et donc d’agir distinctement sur les intentions de carrière. Le fait d’introduire la dimension générationnelle, en plus de celle du genre, est l’occasion d’aborder le concept d’intersectionnalité qui consiste en un croisement des groupes cibles propres à la gestion de la diversité. A l’issue de cet aperçu théorique faisant état de la littérature existante relative à cette thématique des carrières des individus occupant un poste à responsabilités, nous pourrons mettre en évidence différentes questions de recherche qu’il nous faudra, dans un second temps, confronter à la réalité du terrain. [less ▲]

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See detailGenetic variation within β3 subunit integrin sequences and rodent species susceptibility to pathogenic hantaviruses
Pagès, Marie ULg; Tatard, Caroline; Galan, Maxime et al

Conference (2010, April)

Recent investigations in rodent systematics and epidemiology have led to the discovery of numerous Hantavirus species in Asia. As seroprevalences are very low, the screening of thousands of rodents is ... [more ▼]

Recent investigations in rodent systematics and epidemiology have led to the discovery of numerous Hantavirus species in Asia. As seroprevalences are very low, the screening of thousands of rodents is required to genetically identify these hantaviruses and to determine their human pathogenesis as well as their rodent reservoirs. Pathogenic and non-pathogenic hantaviruses use different integrin receptors to enter cells. In particular, human integrins αIIaβ3 and αvβ3 can mediate cellular entry of hemorragic fever with renal syndrome (HFRS)- and hemorragic pulmonary syndrome (HPS)-causing hantaviruses. In contrast, non-pathogenic or low pathogenic hantaviruses were demonstrated to enter the cell via integrin αvβ1. We tested the hypothesis that amino-acid variation in β3 subunit integrin sequences could provide keys to determine a priori the possibility for a rodent species to carry a human pathogenic hantavirus. We sequenced 330 bp of the β3 chain integrin encompassing the Plexin-Semaphorin-Integrin domain, for 63 individuals corresponding to 14 Asian rodent species. We found 65 variable sites and a high level of divergence between species (up to 12%). Although the genetic variation reflected the neutral phylogeny of these species, we found one site differing between rodent species carrying pathogenic hantaviruses and non reservoir rodent species. We also detected another variable site that could be under positive selection, but only in rodent species that do not carry pathogenic hantaviruses. This site did not exhibit any genetic variation in rodent species that carry hantaviruses. In consequence, it is likely that knowing the amino-acid present at this position for a given rodent species could help us determining a priori whether this species is a reservoir of pathogenic hantaviruses. Further investigations are required to examine whether amino-acid changes at these residues could mediate conformational changes that would prevent the fixation of pathogenic hantaviruses. [less ▲]

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See detailRevisiting the taxonomy of the Rattini tribe: a phylogeny-based delimitation of species boundaries
Pagès, Marie ULg; Chaval, Yannick; Herbreteau, Vincent et al

Conference (2010, April)

Rodents are recognized as hosts for at least 60 zoonotic diseases and may represent a serious threat for human health. In the context of global environmental changes and increasing mobility of humans and ... [more ▼]

Rodents are recognized as hosts for at least 60 zoonotic diseases and may represent a serious threat for human health. In the context of global environmental changes and increasing mobility of humans and animals, contacts between pathogens and potential animal hosts and vectors are modified, amplifying the risk of disease emergence. An accurate identification of each rodent at a specific level is needed in order to understand their implications in the transmission of diseases. Among the Muridae, the Rattini tribe encompasses 167 species inhabiting South East Asia, a hotspot of both biodiversity and emerging and re-emerging diseases. The region faces growing economical development that affects habitats, biodiversity and health. Rat species have been demonstrated as significant hosts of pathogens but are still difficult to recognize at a specific level using morphological criteria. DNA-barcoding methods appear as accurate tools for rat species identification but their use is hampered by the need of reliable identification of reference specimens. In this study, we explore and highlight the limits of the current taxonomy of the Rattini tribe. We used the DNA sequence information itself as the primary information source to establish group membership and estimate putative species boundaries. We sequenced two mitochondrial and one nuclear genes from 122 rat samples to perform phylogenetic reconstructions. The method of Pons and colleagues (2006) that determines, with no prior expectations, the locations of ancestral nodes defining putative species was then applied to our dataset. To give an appropriate name to each cluster recognized as a putative species, we reviewed information from the literature and obtained sequences from a museum holotype specimen following the ancient DNA criteria. [less ▲]

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See detailRepresenting Grassed Buffer Strips’ Hydrology in a Regional Scale Model
Sohier, Catherine ULg; Degre, Aurore ULg

Conference (2010, April)

In Walloon Region (Belgium), like in many other European countries, riparian buffer strips appear to become one of the most approved nutrient mitigation measures. Within the frame of the water framework ... [more ▼]

In Walloon Region (Belgium), like in many other European countries, riparian buffer strips appear to become one of the most approved nutrient mitigation measures. Within the frame of the water framework directive, policy makers need nutrient mitigation forecasting at the scale of the surface water bodies (from 3 to 426 km² in Wallonia). It induces that the hydrological models have to deal with different designs of the buffers themselves and of their catchment areas. Up to date, most of the studies focused on sediment deposition at field scale. They concluded that the grassed strips can be very effective; nevertheless, the measured effects are still very variable. More often, the way the runoff water passed through the buffer strip (diffused or concentrated flow) is not considered. We adapted our regional hydrological model (physically based, spatially distributed over the 17.000 km² Walloon region (Sohier et al., 2009)) by developing a new “buffer strip subroutine” that identifies automatically the catchment area of all the buffer strips. This is done using a 10 m resolution DTM. The catchment area is then subdivided into an “area of flow concentration” that leads the water to pass through the buffer strip on a very small portion of it and into an “area of diffuse flow” that leads the water to pass through the buffer strip using its whole length. The daily fluxes of water, nutrient and sediments that pass through the buffer are calculated by the model using our dynamic geodatabases (soil, DTM, weather, land use, agricultural practices). Depending on whether the flow is diffused or concentrated the water depth can vary to a large extent; so does the deposition ratio (algorithm adapted from Deletic, 2001). The buffer itself is modelled as grassland without direct fertilisation. Water and nutrient coming from the watershed can be used by the grass, water can infiltrate, evaporate or runoff and denitrification can occur when the soil is saturated. The oral presentation will show our results at the water body level for different buffer strip scenarios considering sediments and nitrate reduction in surface water. [less ▲]

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See detailAspects environnementaux
Rossi, Barbara ULg

Conference (2010, April)

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See detailThree person-fit indexes with estimated ability level: a simulation study
Béland, Sébastien; Magis, David ULg; Raîche, Gilles et al

Conference (2010, April)

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See detailBrand Concept Maps: A Method of Capturing Doppelganger Brand Image
Brandt, Céline ULg; Pahud de Mortanges, Charles ULg; Bluemelhuber, Christian et al

Conference (2010, April)

In an Internet 2.0 context, negative user-generated content (UGC) that damages the brand reputation can be easily produced and quickly spread. There is a lack of literature on how to measure the impact of ... [more ▼]

In an Internet 2.0 context, negative user-generated content (UGC) that damages the brand reputation can be easily produced and quickly spread. There is a lack of literature on how to measure the impact of this value destruction, known as doppelgänger brand image (DBI). DBI is defined as the appearance, or reinforcement, of negative associations at the brand reputation level. Using brand concept mapping (BCM) on two corporate brands, this study shows the effect of exposure to negative UGC on the brand image perception and measures the impact of this exposure on DBI. The authors use a two*two between-subjects design with 280 consumers in order to study the effects of media and source credibility, brand experience and Internet experience on the DBI. The results suggest that, the negative UGC will cause an increase in the frequency of mentions of negative associations. At the reputation level, if the brand already has a DBI, an exposure to negative UGC will reinforce it. However, if the brand reputation is mostly positive, a single exposure to negative UGC will not create a DBI. The results also confirm the effect of source credibility and media credibility on the likelihood of DBI. The experience with the brand and with Internet will reduce the risk of DBI. [less ▲]

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See detailMeasurement and comparison of elderly welfare in the EU
Lefebvre, Mathieu ULg

Conference (2010, April)

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See detailDirectional and Nondirectional Risk Exposures in Hedge Fund Returns
Lambert, Marie ULg; Hübner, Georges ULg; Papageorgiou, Nicolas

Conference (2010, April)

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See detailEffet de la modalité visuelle sur le jugement de la réverbération d’une salle
Billon, Alexis ULg; Safin, Stéphane ULg; Defays, Aurore ULg et al

Conference (2010, April)

Le projet Auralias vise à développer un environnement immersif permettant le travail coopératif entre architectes et acousticiens. Le système développé associe donc un rendu sonore 3D (au moyen d’un ... [more ▼]

Le projet Auralias vise à développer un environnement immersif permettant le travail coopératif entre architectes et acousticiens. Le système développé associe donc un rendu sonore 3D (au moyen d’un dispositif VBAP) et une vue du modèle 3D de la salle considérée. Dans ce cadre, nous nous intéressons à l’impact de l’image projetée sur le jugement subjectif de l’acoustique de la salle. Ici, le critère objectif étudié est le temps de réverbération. Pour cela, des réponses impulsionnelles synthétiques possédant la même partie précoce (jusqu’à 80 ms) et différentes parties tardives ont été obtenues puis convoluées avec des rythmes de percussions pour obtenir différents échantillons sonores. Après un prétest permettant de définir une série d’images de salles évoquant des réverbérations différentes, un test subjectif en deux parties a été mené sur deux populations différentes. La tâche demandée est à chaque fois un classement des échantillons sonores dans l’ordre de réverbération croissante. Après une situation de contrôle (test réalisé sans l’appui des images), le sujet est soumis à un des trois scénarios suivants : images incitatrices (l’échantillon possédant le plus de réverbération est associé à l’image évoquant le plus long temps de réverbération), images distractrices (l’image soutenant l’échantillon sonore est tirée aléatoirement) et de sans image (testant ainsi l’effet d’apprentissage). Les résultats de cette expérience sont détaillés et permettent des premières prescriptions quant aux images à afficher dans l'environnement immersif pour soutenir la tâche de jugement acoustique. [less ▲]

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