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See detailElectromagnetic absorption properties of carbon nanotube nanocomposite foam filling honeycomb waveguide structures
Quiévy, Nicolas; Bollen, Pierre; Thomassin, Jean-Michel ULg et al

in IEEE Transactions on Electromagnetic Compatibility (2012), 24(1), 43-51

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential ... [more ▼]

Carbon nanotube reinforced polymer foams filling a metallic honeycomb were processed and characterized for the production of hybrid materials with high electromagnetic absorption potential. Electromagnetic modeling and experimental characterization of the hybrids proved that the honeycomb, acting as a hexagonal waveguide, improves the absorption properties in the gigahertz range above the cutoff frequency. The electromagnetic absorption can be tuned by changing the hybrid material properties. The required levels of electrical conductivity are attained owing to the dispersion of low amounts (1–2 wt%) of carbon nanotubes inside the polymermatrix. The combination of the foam and honeycomb architecture contributes to decrease the real part of the relative effective permittivity Re{εr,eff }. Varying the cell shape of the honeycomb changes the frequency range for high absorption. An analytical model for the absorption has been developed, showing good agreement with the experimental results. [less ▲]

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See detail« Spaßmacher » et « Ernstmacher » en poésie allemande. Les poèmes profanes de Robert Gernhardt.
Viehöver, Vera ULg

in Culture, le Magazine Culturel de l'Université de Liège (2012)

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See detailA Finite Element Subproblem Method for Position Change Conductor Systems
Dular, Patrick ULg; Krähenbühl, Laurent; Vazquez Sabariego, Ruth ULg et al

in IEEE Transactions on Magnetics (2012), 48(2), 403-406

Analyses of magnetic systems with position changes of both massive and stranded conductors are performed via a finite element sub- problem method. A complete problem is split into subproblems associated ... [more ▼]

Analyses of magnetic systems with position changes of both massive and stranded conductors are performed via a finite element sub- problem method. A complete problem is split into subproblems associated with each conductor and the magnetic regions. Each complete solution is then expressed as the sum of subproblem solutions supported by different meshes. The subproblem procedure simplifies both meshing and solving processes, with no need of remeshing, and accurately quantifies the effect of the position changes of conductors on both local fields, e.g., skin and proximity effects, and global quantities, e.g., inductances and forces. Applications covering parameterized analyses on conductor positions to moving conductor systems can benefit from the developed approach. [less ▲]

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See detailQuantifications en supergéométrie
Leuther, Thomas ULg

Poster (2012, February)

Le poster présente de façon vulgarisée certaines idées sous-jacentes à la recherche de quantifications invariantes en supergéométrie.

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See detailGC×GC TOFMS analysis of tobacco mainstream smoke
Brokl, Michal ULg; Bishop; Wright et al

in HTC-12 Book of abstracts (2012, February)

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See detailOptimization of particle packing by analytical and computer simulation approaches
He, Huan ULg; Stroeven, Piet; Stroeven, Martijn et al

in Computers and Concrete (2012), 9(2), 119-131

Optimum packing of aggregate is an important aspect of mixture design, since porosity may be reduced and strength improved. It may also cause a reduction in paste content and is thus of economic relevance ... [more ▼]

Optimum packing of aggregate is an important aspect of mixture design, since porosity may be reduced and strength improved. It may also cause a reduction in paste content and is thus of economic relevance too. Several mathematic packing models have been developed in the literature for optimization of mixture design. However in this study, numerical simulation will be used as the main tool for this purpose. A basic, simple theoretical model is used for approximate assessment of mixture optimization. Calculation and simulation will start from a bimodal mixture that is based on the mono-sized packing experiences. Tri-modal and multi-sized particle packing will then be discussed to find the optimum mixture. This study will demonstrate that computer simulation is a good alternative for mixture design and optimization when appropriate particle shapes are selected. Although primarily focusing on aggregate, optimization of blends of Portland cement and mineral admixtures could basically be approached in a similar way. [less ▲]

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See detailEuropean project, demo “NETFLEX” For large integration of renewables using DLR, PST and PMU.
Lilien, Jean-Louis ULg

Conference (2012, February)

forecasting ampacity as a need for power system operation

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See detailEvolution et systématique du genre Pinus
Toussaint, André ULg

in Annales de la Société Belge de Dendrologie = Jaarboek van de Belgische Dendrologische Vereniging (2012), 2010

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See detailResults of kidney transplantation from controlled donors after cardio-circulatory death: a single center experience.
Ledinh, H.; WEEKERS, Laurent ULg; BONVOISIN, Catherine ULg et al

in Transplant International (2012), 25

The aim of this study was to determine results of kidney transplantation (KT) from controlled donation after cardio-circulatory death (DCD). Primary end-points were graft and patient survival, and post ... [more ▼]

The aim of this study was to determine results of kidney transplantation (KT) from controlled donation after cardio-circulatory death (DCD). Primary end-points were graft and patient survival, and post-transplant complications. The influence of delayed graft function (DGF) on graft survival and DGF risk factors were analyzed as secondary end-points. This is a retrospective mono-center review of a consecutive series of 59 DCD-KT performed between 2005 and 2010. Overall graft survival was 96.6%, 94.6%, and 90.7% at 3 months, 1 and 3 years, respectively. Main cause of graft loss was patient's death with a functioning graft. No primary nonfunction grafts. Renal graft function was suboptimal at hospital discharge, but nearly normalized at 3 months. DGF was observed in 45.6% of all DCD-KT. DGF significantly increased postoperative length of hospitalization, but had no deleterious impact on graft function or survival. Donor body mass index >/=30 was the only donor factor that was found to significantly increase the risk of DGF (P < 0.05). Despite a higher rate of DGF, controlled DCD-KT offers a valuable contribution to the pool of deceased donor kidney grafts, with comparable mid-term results to those procured after brain death. [less ▲]

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See detailApport des troponines T et I ultrasensibles dans le diabète
LE GOFF, Caroline ULg; LAURENT, Terry ULg; GARWEG, Christophe ULg et al

in Immuno-Analyse & Biologie Spécialisée [=IBS] (2012, February), 27(1), 40

Introduction : Le diabète atteint environ 3% de la population française. Or, cette maladie expose à l'apparition précoce de complications cardiovasculaires. Les troponines de nouvelles générations ... [more ▼]

Introduction : Le diabète atteint environ 3% de la population française. Or, cette maladie expose à l'apparition précoce de complications cardiovasculaires. Les troponines de nouvelles générations hautement sensibles pourraient être un bon outil diagnostic pour mettre en évidence des macroou micro-angiopathies non diagnostiquée chez ces patients. Le but de notre étude était de comparer la performance de la troponine T ultrasensible (hsTnT) (Roche Diagnostic) avec la troponine I ultrasensible (TnI II) (Abbott Diagnostic) chez le sujet diabétique. Matériel et méthodes : Vingt patients diabétiques (âge moyen : 52.6 ± 8.4 ans) ont été sélectionnés sur le critère d’un taux d’hémoglobine glyquée (HbA1c) élevé. Ces sujets ont été comparés à vingt sujets contrôles d’âge moyen : 60.05 ± 2.86 ans. Les patients atteints d’insuffisance rénale et d’affections cardiovasculaires ont été exclus. Les analyses ont été réalisées sur du plasma hépariné lithium. La hsTnT a été dosée par électrochemiluminescence sur le Modular E (Roche Diagnostic). Abbott utilise des microparticules chemiluminescentes pour le dosage de la TnI II sur l’ARCHITECT i. Résultats : Les sujets diabétiques ont un taux plasmatique de hsTnT représenté par les valeurs suivantes [médiane (1er quartile, 3ème quartile)] : 0,007 (0,03 ; 0,018) ng/mL ; alors que les sujets contrôles négatifs présentent les valeurs suivantes : 0,003 (0,003 ; 0,004) ng/mL. La différence de taux de hsTnT observée entre ces 2 populations est statistiquement significative (p = 0,000922). Pour la TnI II, on observe un taux plasmatique de: 0,004 (0,003 ; 0,075) ng/mL chez les sujets diabétiques et 0,002 (0,001 ; 0,005) ng/mL chez les sujets contrôles. La différence de taux de TnI II observée entre ces 2 populations n’est pas statistiquement significative (p > 0,005). Discussion-conclusion : Au décours d’un diabète, il apparait que les taux de hsTnT sont augmentés de façon significative par rapport au groupe des contrôles négatifs. Si les taux hsTnT augmentent chez le diabétique, il semblerait normal qu’il en soit de même pour la TnI II, vu que ces deux marqueurs sont intimement liés. Nous ne l’avons pas observé mais ceci peut être du à la plus faible performance analytique du dosage de la TnI II utilisé. Cette libération de hsTnT dans le sang peut être due aux micro- et macro-angiopathies au niveau des coronaires induites au cours d’un diabète. [less ▲]

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See detailLa monnaie de sa pièce. Poétique et morale du macairisme dans les Physiologies
Stienon, Valérie ULg

in Fix, Florence; Fougère, Marie-Ange (Eds.) L’argent et le rire, de Balzac à Mirbeau (2012)

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See detailAn association between short-term memory for order and numerical cognition in 3rd grade kindergarten children.
Attout, Lucie ULg; Majerus, Steve ULg

Conference (2012, February)

Several studies explored the relationship between verbal short-term memory (STM) and numerical cognition, but with inconclusive findings. The present study re-explored this relationship, by adopting the ... [more ▼]

Several studies explored the relationship between verbal short-term memory (STM) and numerical cognition, but with inconclusive findings. The present study re-explored this relationship, by adopting the critical distinction between STM for item information (the items to be retained) and STM for order information (the order of the items within a list). We hypothesized that especially STM for order should be related to the development of numerical abilities, given that recent studies suggest the intervention of common processes during the representation of order information in STM and numerical tasks. We investigated item and order STM abilities and numerical processing abilities in 72 children during their third year in kindergarten. We observed that order STM abilities, but not item STM abilities, correlated significantly with performance on numerical order judgment and calculation tasks. These associations remained after control of interindividual differences in verbal and non-verbal cognitive efficiency. Our results suggest a specific relationship between order STM processes and numerical cognition, opening new perspectives for our understanding of the STM determinants of numerical cognition development. [less ▲]

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See detailLe ciel pour tous
Nazé, Yaël ULg

Article for general public (2012)

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See detailDu bon usage des catastrophes, de Régis Debray
Thoreau, François ULg

in Revue Nouvelle (2012), 66(2), 74-77

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See detailA non-linear homogeneous model for bone-like materials under compressive load.
Mengoni, Marlène ULg; Voide, Romain; de Bien, Charlotte ULg et al

in International Journal for Numerical Methods in Biomedical Engineering (2012), 28(2), 334-348

Finite element (FE) models accurately compute the mechanical response of bone and bone-like materials when the models include their detailed microstructure. In order to simulate non-linear behavior, which ... [more ▼]

Finite element (FE) models accurately compute the mechanical response of bone and bone-like materials when the models include their detailed microstructure. In order to simulate non-linear behavior, which currently is only feasible at the expense of extremely high computational costs, coarser models can be used if the local morphology has been linked to the apparent mechanical behavior. The aim of this paper is to implement and validate such a constitutive law. This law is able to capture the non-linear structural behavior of bone-like materials through the use of fabric tensors. It also allows for irreversible strains using an elastoplastic material model incorporating hardening. These features are expressed in a constitutive law based on the anisotropic continuum damage theory coupled with isotropic elastoplasticity in a finite strains framework. This material model was implemented into Metafor, a non-linear FE software. The implementation was validated against experimental data of cylindrical samples subjected to compression. Three materials with bone-like microstructure were tested : aluminum foams of variable density (ERG, Oakland, CA), PLA (polylactic acid) foam (CERM, University of Liège) and cancellous bone tissue of a deer antler (Faculty of Veterinary Medicine, University of Liège). [less ▲]

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See detailComparing vertical ground heat exchanger models
Bertagnolio, Stéphane ULg; Bernier, Michel; Kummert, Michaël

in Journal of Building Performance Simulation [=JBPS] (2012)

The main objective of this article is to establish a set of test cases for analytical verification and inter-model comparison of vertical ground heat exchanger (GHX) models used in building simulation ... [more ▼]

The main objective of this article is to establish a set of test cases for analytical verification and inter-model comparison of vertical ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with relatively large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated with different GHX models. This comparison exercise has shown that analytical one-dimensional (1D) models compare favourably well with three-dimensional (3D) models for relatively short-simulation periods, where axial effects are not significant. Cyclic heat rejection/collection tests proved to be useful to characterize the accuracy and the computational performance of different load aggregation algorithms. Finally, different spatial superposition methods have been compared for various bore field sizes and configurations and various loads. [less ▲]

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