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See detailExperimental determination of the number of flux lines trapped by microholes in superconducting samples
Silhanek, Alejandro ULg; Raedts, S.; Van Bael, M. J. et al

in Physical Review. B : Condensed Matter (2004), 70(5),

The influence of a periodic landscape of pinning sites on the vortex dynamics in Pb thin films is explored by ac susceptibility measurements. For different amplitudes h of the ac drive, the ac ... [more ▼]

The influence of a periodic landscape of pinning sites on the vortex dynamics in Pb thin films is explored by ac susceptibility measurements. For different amplitudes h of the ac drive, the ac susceptibility chi=chi'+ichi" exhibits a complex field dependence associated with different dynamic regimes. At very low ac drives where both multiquanta vortices trapped by the antidots and interstitial vortices oscillate inside the pinning potential (intravalley motion), a small kink in chi'(H) together with a very low dissipation is observed. At intermediate ac excitations such that vortices in the antidots remain pinned, whereas interstices are driven out of the pinning well, a more pronounced kink in the screening coinciding with the onset of dissipation [chi"(H)not equal0] indicates the entrance of interstitial vortices. Eventually, at high enough amplitudes all vortices are set in motion and the penetration of interstitial vortices appears as a sudden reduction of the shielding power. We show that these distinctive features allow us to identify clearly the maximum number of flux quanta per hole, regardless of the vortex dynamic regime. [less ▲]

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See detailExperimental dissociations between memory measures: Influence of retrieval strategies.
Willems, Sylvie ULg; Van der Linden, Martial

in Consciousness & Cognition (2008)

The objective of this study was to explore the participants' processing strategies on the mere exposure effect, object decision priming and explicit recognition. In Experiments 1, we observed that ... [more ▼]

The objective of this study was to explore the participants' processing strategies on the mere exposure effect, object decision priming and explicit recognition. In Experiments 1, we observed that recognition and the mere exposure effect for unfamiliar three-dimensional objects were not dissociated by plane rotations in the same way as recognition and object decision priming. However, we showed that, under identical conditions, prompting analytic (part-based) processing at testing produced a large plane rotation effect on recognition and the mere exposure effect similar to that observed for object decision priming (Experiment 2). Furthermore, inducing a non-analytic (whole-based) processing strategy at testing produced a reduced plane rotation effect on recognition and object decision (Experiments 3 and 4), similar to that observed for the mere exposure effect. These findings suggest that participants' processing strategies influence performance on the three tasks. [less ▲]

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See detailExperimental early-life febrile seizures induce changes in GABA(A) R-mediated neurotransmission in the dentate gyrus.
Avila Macaya, Ariel Salvatore ULg

in Epilepsia (2012)

PURPOSE:   Febrile seizures (FS), the most frequent seizure type during childhood, have been linked to temporal lobe epilepsy (TLE) in adulthood. Yet, underlying mechanisms are still largely unknown ... [more ▼]

PURPOSE:   Febrile seizures (FS), the most frequent seizure type during childhood, have been linked to temporal lobe epilepsy (TLE) in adulthood. Yet, underlying mechanisms are still largely unknown. Altered γ-aminobutyric acid (GABA)ergic neurotransmission in the dentate gyrus (DG) circuit has been hypothesized to be involved. This study aims at analyzing whether experimental FS change inhibitory synaptic input and postsynaptic GABA(A) R function in dentate granule cells. METHODS:   We applied an immature rat model of hyperthermia (HT)-induced FS. GABA(A) R-mediated neurotransmission was studied using whole-cell patch-clamp recordings from dentate granule neurons in hippocampal slices within 6-9 days post-HT. KEY FINDINGS:   Frequencies of spontaneous inhibitory postsynaptic currents (sIPSCs) were reduced in HT rats that had experienced seizures, whereas sIPSC amplitudes were enhanced. Whole-cell GABA responses revealed a doubled GABA(A) R sensitivity in dentate granule cells from HT animals, compared to that of normothermic (NT) controls. Analysis of sIPSCs and whole-cell GABA responses showed similar kinetics in postsynaptic GABA(A) Rs of HT and NT rats. quantitative real-time polymerase chain reaction (qPCR) experiments indicated changes in DG GABA(A) R subunit expression, which was most pronounced for the α3 subunit. SIGNIFICANCE:   The data support the hypothesis that FS persistently alter neuronal excitability. [less ▲]

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See detailExperimental evaluation of a new nitinol selfexpandable vascular stent
Tancredi; Trotteur; Snaps, Frédéric ULg et al

Poster (1997)

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See detailExperimental evaluation of a spray drift Gaussian tilting plume model.
Stainier, Charles; Robaye, Vincent ULg; Destain, Marie-France ULg et al

in Aspects of Applied Biology (2006), 77(2), 365-370

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser ... [more ▼]

This paper evaluates the application of a Gaussian tilting plume model to study agricultural spraying drift. The spray drift deposit of each droplet diameter class, measured by a laser particle analyser, is computed independently and summed to give footprint results for different nozzle. The methodology is used to model the drift from a fiat fan nozzle operating in a wind tunnel. Discrepancies with experimental data and the potential for further improvement of this approach are discussed. [less ▲]

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See detailExperimental evaluation of flux footprint by natural tracer experiment
Arriga, N.; Aubinet, Marc ULg; Carrara, A. et al

Poster (2009, April)

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See detailExperimental Evaluation of Visual Interfaces Of In-Vehicle-Information Systems For Older Adults
Ziefle, M.; Pappachan, P.; Jakobs, E.-M. et al

(2007, May 21)

In this experiment older and younger drivers were examined in a driving simulator when using in vehicle information systems (IVIS). An in-vehicle intersection assistant was developed, which informed ... [more ▼]

In this experiment older and younger drivers were examined in a driving simulator when using in vehicle information systems (IVIS). An in-vehicle intersection assistant was developed, which informed drivers timely about the current traffic in the next intersection. In order to learn about the visual load, the intersection assistant was tested in two display sizes (a larger and a smaller interface). Independent variables were users’ age (young vs. old) and the size of the visual interface. As dependent variables, speed and accuracy of lane tracking was surveyed. Results showed an overall significant age-effect with older adults showing lower driving speed but an equally high line tracking accuracy compared to the younger group. Respecting the two sizes, it was found that the larger display led to a more careful and more accurate driving, especially in the critical traffic situations as intersection areas. [less ▲]

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See detailExperimental evidence and numerical prediction of nonlinear modal interactions in a real-life aerospace structure
Renson, Ludovic ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg

in Proceedings of the ISMA 2014 conference (2014, September)

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably ... [more ▼]

During the last decade, the existence of nonlinear behaviour in spacecraft dynamic testing was frequently attested. However, current practice in industry is still to ignore nonlinearities, arguably because their analysis is regarded as impractical. The objective of the present contribution is to show that there now exists experimental and numerical methodologies which can deal with nonlinear phenomena in real-life structures. Specifically, this study investigates nonlinear modal interactions evidenced during the qualification campaign of the SmallSat spacecraft developed by EADS-Astrium. The ability to understand and reliably predict such interactions is of utmost importance as they may involve energy transfer between modes and, in turn, jeopardise the structural integrity. The paper proceeds in two steps, leading to great-fidelity reproductions of the experimental observations. In the first step, sine-sweep data collected during the qualification campaign are exploited to build a nonlinear computational model of the SmallSat with good predictive capabilities. To this end, the complete progression through nonlinearity detection, characterisation and parameter estimation is carried out by means of several techniques, such as the wavelet transform and the restoring force surface method. In the second step, the computational model is exploited through continuation algorithms to compute the nonlinear normal modes of the spacecraft and predict potential interactions. A very good agreement between experimental and numerical results is obtained for 2:1 interactions between modes with non-commensurate linear frequencies. [less ▲]

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See detailExperimental evidence for N recycling in the leaves of the seagrass Posidonia oceanica
Lepoint, Gilles ULg; Defawe, Olivier; Gobert, Sylvie ULg et al

in Journal of Sea Research (2002), 48(3), 173-179

A one-year in situ experiment using N-15 as a tracer was designed to assess the N recycling in the leaves of the seagrass Posidonia oceanica (L.) Delile. R oceanica was shown to partly recycle the ... [more ▼]

A one-year in situ experiment using N-15 as a tracer was designed to assess the N recycling in the leaves of the seagrass Posidonia oceanica (L.) Delile. R oceanica was shown to partly recycle the internal nitrogen pool of its leaves in order to contribute to new leaf growth. The leaves sampled in June 1999 contained 20% of the quantity of N-15 found in June 1998. N recycling caused a difference between N and biomass turnover rate (0.8 vs 1.3 y(-1)) of Posidonia leaves. This 40% difference should correspond to the contribution of recycled N to the annual N requirement of Posidonia leaves. The N recycling appears to be insufficient to significantly reduce the quantitative impact of N loss due to autumnal leaf fall. However, new leaf growth between June and October is mainly sustained by this recycling because the tracer concentration in new leaves was the same as in the other leaves. By contrast, tracer concentration decreased drastically between October 1998 and June 1999, showing the more important contribution of N uptake during winter and spring. Nevertheless, recycling occurs throughout the year as demonstrated by the presence of tracer in the youngest leaves of shoots sampled one year after the tracer addition. (C) 2002 Elsevier Science B.V. All rights reserved. [less ▲]

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See detailExperimental evidence for the action of M. fijiensis toxins on banana photosynthetic apparatus.
Busogoro, J. P.; Etame, J. J.; Harelimana, G. et al

in Banana improvement: cellular, molecular biology, and induced mutations.Proceedings of a meeting held in Leuven, Belgium, 24-28 September 2001 (2004)

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See detailExperimental evidence of recombination in murine noroviruses
Mathijs, Elisabeth ULg; Muylkens, Benoît ULg; Mauroy, Axel ULg et al

in Journal of General Virology (The) (2010)

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See detailExperimental evidence of the role of thiamine in nerve conduction as determined by HPLC using pre- and post-column derivatization techniques
Bettendorff, Lucien ULg; Bontemps, J; Lombet, J et al

in Archives Internationales de Physiologie et de Biochimie (1984), 92

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See detailExperimental evidences of a structural and dynamical transition in fish school
Becco, Christophe ULg; Vandewalle, Nicolas ULg; Delcourt, Johann ULg et al

in Physica A: Statistical Mechanics and its Applications (2006), 367

We have developed a video tracking system in order to determine all the trajectories of young fish (Oreochromis niloticus L.) within a school. Both individual and collective behaviours have been studied ... [more ▼]

We have developed a video tracking system in order to determine all the trajectories of young fish (Oreochromis niloticus L.) within a school. Both individual and collective behaviours have been studied as a function of the number of fish per unit area. By studying distributions of distances between fish and distributions of relative orientations, structural effects and cooperative motions have been evidenced. Signatures of a phase transition have been found, as predicted by some numerical models. This work opens new perspectives in the study of collective phenomena in biological systems since it is the first time that such measurements are possible. [less ▲]

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See detailExperimental Fe2+-oxidation in triphylite, LiFePO4 : possible formation of ferrisicklerite and heterosite
Schmid-Beurmann, Peter ULg; Hatert, Frédéric ULg

in Berichte der Deutschen Mineralogischen Gesellschaft : Beihefte zum European Journal of Mineralogy (2005), 17

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See detailExperimental gerontology in Belgium: from model organisms to age-related pathologies
Toussaint, Olivier; Baret, P. V.; Brion, J.-P. et al

in Experimental Gerontology (2000), 35(8), 901-916

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See detailExperimental Hafting Traces. Identification and Characteristics
Rots, Veerle ULg; Pirnay, Louis; Pirson, Philippe et al

in Notae Praehistoricae (2001), 21

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See detailExperimental hypertension: early changes in collagen metabolism
Foidart, Jean-Michel ULg; Rorive, Georges ULg; Carlier, P. G. et al

in Revue Médicale de Liège (1983), 38(12), 537-49

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See detailExperimental identification of a non-linear beam, conditionned reverse path method
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg

in International Conference on Structural Systems Identification, Kassel, 2001 (2001, September)

A new spectral approach for identification of multi-degree-of-freedom nonlinear systems, called the conditioned reverse path method, has recently been introduced. The key idea of this method is to ... [more ▼]

A new spectral approach for identification of multi-degree-of-freedom nonlinear systems, called the conditioned reverse path method, has recently been introduced. The key idea of this method is to eliminate the distortions caused by the presence of non-linearities in frequency response functions. Conditioned frequency responses are then computed and yield the underlying linear properties without influence of non-linearities. The non-linear coefficient is estimated in a second step. The aim of the paper is twofold. Firstly, the conditioned reverse path method is described in details together with the spectral conditioning techniques. Secondly, the ability of this technique to identify the behaviour of an experimental cantilever beam with a geometrical non-linearity is tested. [less ▲]

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