References of "2012"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailHighly Confined Spin-Polarized Two-Dimensional Electron Gas in SrTiO3/SrRuO3 Superlattices
Verissimo-Alves, M.; Garcia-Fernandez, P.; Bilc, Daniel ULg et al

in Physical Review Letters (2012), 108

We report first-principles characterization of the structural and electronic properties of (SrTiO3)5/(SrRuO3)1 superlattices. We show that the system exhibits a spin-polarized two-dimensional electron gas ... [more ▼]

We report first-principles characterization of the structural and electronic properties of (SrTiO3)5/(SrRuO3)1 superlattices. We show that the system exhibits a spin-polarized two-dimensional electron gas, extremely confined to the 4d orbitals of Ru in the SrRuO3 layer. Every interface in the superlattice behaves as a minority-spin half-metal ferromagnet, with a magnetic moment of µ = 2.0µB/SrRuO3 unit. The shape of the electronic density of states, half-metallicity, and magnetism are explained in terms of a simplified tight-binding model, considering only the t2g orbitals plus (i) the bidimensionality of the system and (ii) strong electron correlations. [less ▲]

Detailed reference viewed: 22 (1 ULg)
Full Text
Peer Reviewed
See detailApproche dépendancielle de la coordination des compléments du verbe en ancien français
Mazziotta, Nicolas ULg

in Neveu, Frank; Muni Toke, Valelia; Blumenthal, Peter (Eds.) et al 3e Congrès Mondial de Linguistique Française (2012)

Detailed reference viewed: 18 (0 ULg)
Full Text
Peer Reviewed
See detailWhat changes in inflammatory bowel disease management can be implemented today?
LOUIS, Edouard ULg; Baumgart, Daniel C.; Ghosh, Subrata et al

in Journal of Crohn’s and Colitis [=JCC] (2012), 6 Suppl 2

Innovative ideas are required to improve the management of inflammatory bowel disease and to share best practice that can be implemented into clinical practice today. The use of biomarkers such as ... [more ▼]

Innovative ideas are required to improve the management of inflammatory bowel disease and to share best practice that can be implemented into clinical practice today. The use of biomarkers such as calprotectin to monitor disease progression and treatment response could help to improve management of inflammatory bowel disease, but several strategies need to be implemented to make this a reality in clinical practice. The use of calprotectin as a biomarker and the manipulation of the thiopurine pathway to extend the use of current therapies are examples of how basic research can translate into patient benefit. Translational research into the use of microbiota and predictive factors for response and toxicity to drugs, may provide future clinical applications. Global improvement in care in inflammatory bowel disease could also be advanced by improving service provision. For example, the establishment of 'Centres of Excellence', a global interactive inflammatory disease map, and the alignment of processes and standards of care within treatment centres may help to achieve better outcomes for patients with inflammatory bowel disease. Realization of this goal, as well as a better understanding of the aetiology of the disease, may be furthered by collaborative efforts between organizations involved in inflammatory bowel disease as well as wider collaboration across countries and globally. [less ▲]

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailDynamiques transactionnelles de reconnaissance dans l’accompagnement des enseignants novices.
Dejean, Karine ULg

in Recherches & Educations (2012), 7

This paper is based on current doctoral research investigating recognition processes that condition professional identity construction of novice teachers at the beginning of their career. This study ... [more ▼]

This paper is based on current doctoral research investigating recognition processes that condition professional identity construction of novice teachers at the beginning of their career. This study focuses on a specific stage of professional integration which is the traineeship and analyzes accompaniment strategies that trainees consider to be positive to the development of their capacity to act as a part of their professional skills. Three case studies are presented. They report on self-recognition mechanisms that support the development of valued professional self-images and the emotional dynamics that these processes involve. [less ▲]

Detailed reference viewed: 12 (0 ULg)
See detailDe l'EXPERImental à l'expériMENTAL
Daro, Sabine; Poffé, Corentin ULg

in Evrard, Thierry; Amory, Brigitte (Eds.) Réveille-moi les sciences Apprendre les sciences de 2 ans 1/2 à 14 ans (2012)

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailExperimental and Numerical Investigations of the Aeroelastic Stability of Bluff Structures
Andrianne, Thomas ULg

Doctoral thesis (2012)

The study of the dynamic interactions between the wind and civil engineering structures has become increasingly important over the last few decades. Most of these structures are aerodynamically "bluff ... [more ▼]

The study of the dynamic interactions between the wind and civil engineering structures has become increasingly important over the last few decades. Most of these structures are aerodynamically "bluff" and are becoming more flexible. Bluff-body aeroelasticity is a very challenging research area due to the unsteadiness and nonlinearity of the aerodynamic loading. This thesis presents the investigation of three aeroelastic phenomena affecting bluff-bodies: Vortex Induced Vibration (VIV), Galloping and Torsional Flutter. For each instability, extensive experimental studies are carried out in the wind tunnel. Innovative analysis, based on the Common-base Proper Orthogonal Decomposition (CPOD) method is used to study the flow visualization data. The VIV phenomenon is studied on a flexible tube with a circular cross-section, supported from its midpoint. A CPOD-based input-output model is developed to describe the system. The galloping instability is studied on a generic bridge section. A complete analysis of the aeroelastic behaviour of the structure is presented and a new polynomial empirical model is developed, which reflects accurately the nonlinear nature of the system. The torsional flutter phenomenon is extensively studied for two different structures: a generic bridge deck and a rectangular cylinder. The Motion Induced Vortex is identified as the fundamental cause of this aeroelastic phenomenon, on the basis of the analysis of the flow around the oscillating rectangle. In addition, it is demonstrated that the quasi-steady theory is not adapted to estimate the onset velocity of torsional flutter. Finally, a 2D aeroelastic simulation code, based on the Discrete Vortex Method (DVM) is developed. The non-linear aerodynamics around the body are well reproduced, allowing the simulation of all the aeroelastic instabilities investigated experimentally. [less ▲]

Detailed reference viewed: 204 (65 ULg)
Full Text
Peer Reviewed
See detailNational Forest Inventory contributions to forest biodiversity monitoring
Chirici, Gherardo; McRoberts, Ronald E.; Winter, Susanne et al

in Forest Science (2012), 58(3), 257-268

Forests are the most biodiverse terrestrial ecosystems. National forest inventories (NFIs) are the main source of information on the status and trends of forests, but they have traditionally been designed ... [more ▼]

Forests are the most biodiverse terrestrial ecosystems. National forest inventories (NFIs) are the main source of information on the status and trends of forests, but they have traditionally been designed to assess land coverage and the production value of forests rather than forest biodiversity. The primary international processes dealing with biodiversity and sustainable forest management, the convention on Biological Diversity (CBD), Forest Europe, Streamlining European Biodiversity Indicators 2010 of the European Environmental Agency, and the Montréal Process, all include indicators related to forest biodiversity. The scope of this article is to review and present possibilities offered by NFIs to harmonize estimation of indicators useful for international forest and present possibilities offered by NFIs to harmonize estimation of indicators useful for international forest biodiversity monitoring and reporting. We summarize key findings from Working Group 3 of Action E43 (« Harmonization of National Forest Inventories in Europe : Techniques for Common Reporting ») of the European program Cooperation in Science and Technology (COST). We discuss definitions and techniques for harmonizing estimates of possible biodiversity indicators based on data from NFIs in Europe and the United States. We compare these possible indicators with indicators selected by international processes. The results demonstrate that NFIs can report comparable or harmonized estimates of indicators for multiple biodiversity features (forest categories, deadwood, forest age, forest structure, and forest naturalness), but for others (ground vegetation and regeneration) NFIs should invest more in harmonization efforts. On the basis of these key findings, we recommend that NFIs should represent a main component of a future global biodiversity monitoring network as urgently requested by the CBD. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
Peer Reviewed
See detailEffect of Additives on Freeze-Drying and Storage of Yarrowia lipolytica Lipase.
Darvishi, Farshad; Destain, Jacqueline ULg; Nahvi, Iraj et al

in Applied Biochemistry and Biotechnology (2012)

The extracellular lipase of Yarrowia lipolytica presents numerous potentialities for biotechnological applications. This work describes the development and storage of powders obtained from supernatants ... [more ▼]

The extracellular lipase of Yarrowia lipolytica presents numerous potentialities for biotechnological applications. This work describes the development and storage of powders obtained from supernatants containing Y. lipolytica lipase by freeze-drying as downstream process that is important in obtaining a stable lipase powder with high enzymatic activity. Lipase was produced by Y. lipolytica U6 mutant strain in 20-L bioreactor. Non-concentrated cell-free culture supernatant samples were supplemented with different concentrations (0.5-1 %) of maltodextrin and glycerol as additives to freeze-drying. Effects of additives, temperature, pH, and storage time on lipase powders were determined. After addition of additives, freeze-drying yield increased 3.5-fold compared to supernatant without additive. Maltodextrin with 0.5 % concentration gave the best protection of lipase during dehydration treatment and its freeze-drying yield (77 %) is better than other formulations. Lipase powders were stored at 4 and 25 degrees C for 46 weeks without loss of lipase activity. A common impediment to the production of commercial enzyme is their low-stability aqueous solutions. The present study shows that freeze-dried lipase powders of Y. lipolytica have good stability for storage and various applications. [less ▲]

Detailed reference viewed: 17 (3 ULg)
Peer Reviewed
See detailLes adverbes latins dans un corpus d'oeuvres: aspects quantitatifs et qualitatifs
Denooz, Joseph ULg

in Brachet, Jean-Paul; Fruyt, Michèle; Lecaudé, Peggy (Eds.) Les adverbes latins: syntaxe et sémantique (2012)

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailElectrical properties of improper ferroelectrics from first principles
Stengel, Massimiliano; Fennie, Craig J.; Ghosez, Philippe ULg

in Physical Review. B, Condensed Matter and Materials Physics (2012), 86

We study the interplay of structural and polar distortions in hexagonalYMnO3 and short-period PbTiO3/SrTiO3 (PTO/STO) superlattices by means of first-principles calculations at constrained electric ... [more ▼]

We study the interplay of structural and polar distortions in hexagonalYMnO3 and short-period PbTiO3/SrTiO3 (PTO/STO) superlattices by means of first-principles calculations at constrained electric displacement field D. We find that in YMnO3 the tilts of the oxygen polyhedra produce a robustly polar ground state, which persists at any choice of the electrical boundary conditions. Conversely, in PTO/STO the antiferrodistortive instabilities alone do not break inversion symmetry, and open-circuit boundary conditions restore a nonpolar state.We suggest that this qualitative difference naturally provides a route to rationalizing the concept of “improper ferroelectricity” from the point of view of first-principles theory. We discuss the implications of our arguments for the design of novel multiferroic materials with enhanced functionalities and for the symmetry analysis of the phase transitions. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailµCT-Based, Anatomical Finite Element Model of a Unilateral Fixator for Bone Reconstruction in Rabbit Tibia
Karunratanakul, Kavin; Kerckhofs, Greet ULg; Lammens, Johan et al

Conference (2012)

Detailed reference viewed: 8 (1 ULg)
See detailAccompagner un processus de changement dans le cadre du développement de la VAE au sein de deux universités: analyse des stratégies
Dejean, Karine ULg

in Charlier, Evelyne (Ed.) Accompagner un agir professionnel (2012)

L'article décrit les stratégies d'accompagnement mises en œuvre dans le cadre du développement de la validation des acquis de l'expérience (VAE) au sein de deux universités. Les différents rôles joués par ... [more ▼]

L'article décrit les stratégies d'accompagnement mises en œuvre dans le cadre du développement de la validation des acquis de l'expérience (VAE) au sein de deux universités. Les différents rôles joués par les accompagnateurs et les tensions entre ceux-ci sont analysés [less ▲]

Detailed reference viewed: 15 (1 ULg)
See detailTravailler le social dans une société du travail sur Soi
Vrancken, Didier ULg

in Aballea, François (Ed.) Institutionnalisation, désinstitutionnalisation de l’intervention sociale (2012)

Tout en analysant les reconfigurations et les mouvements d'inflexion actuellement en cours au sein du travail social, cet article propose de les situer dans un contexte sociétal plus général, celui de l ... [more ▼]

Tout en analysant les reconfigurations et les mouvements d'inflexion actuellement en cours au sein du travail social, cet article propose de les situer dans un contexte sociétal plus général, celui de l'avènement de "Sociétés du travail sur Soi". [less ▲]

Detailed reference viewed: 65 (4 ULg)
Full Text
Peer Reviewed
See detailCommunity assembly along a soil depth gradient: contrasting patterns of plant trait convergence and divergence in a Mediterranean rangeland
Bernard-Verdier, Maud; Navas, Marie-Laure; Vellend, Mark et al

in Journal of Ecology (2012), (100), 1422-1433

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such ... [more ▼]

1. Understanding how environmental factors drive plant community assembly remains a major challenge in community ecology. The strength of different assembly processes along environmental gradients, such as environmental filtering and functional niche differentiation, can be quantified by analysing trait distributions in communities. While environmental filtering affects species occurrence among communities, functional divergence or convergence is strongly related to species abundances within communities, which few studies have taken into account. We examine the trait-mediated effect of these two processes along a stress-resource gradient. 2. We measured species abundances and the distributions of eight traits related to vegetative and regenerative phases in plant communities along a gradient of soil depth and resource availability in Mediterranean rangelands. We quantified environmental filtering, defined as a local restriction of trait range, and trait divergence, based on abundance-weighted trait variance, using a two-step approach with specifically designed null models. 3. Communities presented a clear functional response to the soil gradient, as evidenced by strong trends in community-weighted trait means. We detected environmental filtering of different traits at both ends of the gradient, suggesting that, contrary to widespread expectations, trait filtering may not necessarily be the result of abiotic filtering under harsh conditions but could likely also result from biotic interactions in productive habitats. 4. We found marked shifts in trait abundance distributions within communities along the gradient. Vegetative traits (e.g. leaf dry matter content) diverged on shallow soils, reflecting the coexistence of distinct water- and nutrient-use strategies in these constrained habitats and converged with increasing soil resource availability. By contrast, regenerative traits (e.g. seed mass) tended to diverge towards deeper soils, while plant reproductive heights diverged all along the gradient. 5. Synthesis: Our study highlights how the combination of abundance data with traits capturing different functional niches is critical to the detection of complex functional responses of plant communities to environmental gradients. We demonstrate that patterns of trait divergence and filtering are strongly contingent on both trait and environment such that there can be no expectation of a simple trend of increasing or decreasing functional divergence along a gradient of resource availability. [less ▲]

Detailed reference viewed: 27 (4 ULg)
Full Text
Peer Reviewed
See detailModel-based Monitoring of Septic Shock Treated with Large-Pore Hemofiltration Therapy
Revie; Stevenson, D; Chase, JG et al

in Proceedings of BMS 2012 (2012)

Detailed reference viewed: 13 (0 ULg)
Peer Reviewed
See detailImproving Generalization for 3D Object Categorization with Global Structure Histograms
Madry, Marianna; Ek, Carl Henrik; Detry, Renaud ULg et al

in IEEE/RSJ International Conference on Intelligent Robots and Systems (2012)

Detailed reference viewed: 18 (0 ULg)
Full Text
Peer Reviewed
See detailLa vie familiale et sociale dans l'Atlas linguistique de la Wallonie
Baiwir, Esther ULg

in micRomania (2012), 4

Detailed reference viewed: 98 (11 ULg)
Full Text
See detailMieux comprendre et évaluer la réserve en eau des sols forestiers
Ridremont, François ULg; Degré, Aurore ULg; Claessens, Hugues ULg

in Forêt Wallonne (2012), 116

La ressource en eau constitue un des facteurs déterminants de l’adaptation de nos écosystèmes forestiers aux bouleversements climatiques annoncés. L’évaluation de la réserve en eau des sols devrait amener ... [more ▼]

La ressource en eau constitue un des facteurs déterminants de l’adaptation de nos écosystèmes forestiers aux bouleversements climatiques annoncés. L’évaluation de la réserve en eau des sols devrait amener à une meilleure perception de la vulnérabilité des stations forestières au stress hydrique et à des recommandations de gestion plus précises quant au choix des essences à implanter et aux techniques de sylviculture. Cet article introductif rappelle quelques fondamentaux concernant l’économie en eau d’un sol et la capacité des arbres à puiser l’eau stockée. [less ▲]

Detailed reference viewed: 58 (17 ULg)