References of "Scientific congresses and symposiums"
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See detailPancreatitis in familial hypocalciuric hypercalcaemia
Potorac, Iulia ULg; MALAISE, Olivier ULg; Daly, Adrian ULg et al

in Endocrine Abstracts (2015, May)

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See detailAnatomic features underlying wood density, in 110 rainforest tree species from central Congo basin
de Haulleville, Thalès ULg; Rousseau, Mélissa; Morin-Rivat, Julie ULg et al

Poster (2015, May)

Investigate the influence of fiber thickness and vessel diameter on the wood density in 110 rainforest tree species, and the relationships between wood density, wood water content and shrinking ratio.

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See detailIn vitro evaluation of fermentation characteristics of two types of insects, as potential novel protein feeds for pigs
POELAERT, Christine ULg; Beckers, Yves ULg; Despret, Xavier et al

in 13th International Symposium on Digestive Physiology of Pigs (2015, May)

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See detailDerjaguin-Broekhoff-de Boer analysis of adsorption in very disordered mesopores using probabilistic models
Gommes, Cédric ULg

Poster (2015, May)

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent ... [more ▼]

Our current ability to produce mesoporous materials with ordered morphology has raised fascinating questions about the impact of geometrical disorder on adsorption and desorption states [1]. Many recent works have investigated the role of mild elements of disorder, such as local constriction or corrugation superimposed to otherwise geometrically ideal cylindrical pores [2,3]. These works have notably shown that elements of disorder may act as nucleation sites and destabilize vapor-like metastable states. The relevance of these perturbation-like results to fundamentally disordered materials, such as gels, is unclear. In particular, do vapor-like metastable states exist at all in this type of very disordered material? In the present communication, we address this question using probabilistic models to investigate the role of disorder. We generalize the classical Gaussian field models of porous materials [4] and use them to analyze adsorption and desorption in the Derjaguin-Broekhof-de Boer approximation. Our approach differs from earlier contributions in that both the adsorbent and the adsorbate are described in terms of probabilities [5]. This enables us to analyze the adsorbate configuration in very disordered solids using a low-dimensional yet realistic configuration space. We notably show that vapor-like metastable states are unlikely in gel-like disordered materials. [1] D.Wallacher, N. Künzner, D. Kovalev, N. Knorr, K. Knorr, Capillary condensation in linear mesopores of different shape, Phys. Rev. Lett. 92 (2004) 195704; [2] B. Coasne, A. Galarneau, F. Di Renzo, R.M.J. Pellenq, Effect of morphological defects on gas adsorption in nanoporous silicas, J. Phys. Chem. C 111 (2007) 15759; [3] C.J. Gommes, Adsorption, capillary bridge formation, and cavitation in SBA-15 corrugated mesopores: A Derjaguin-Broekhoff-de Boer analysis, Langmuir 28 (2012) 5101-5115; [4] R.J. Pellenq, P. levitz, Capillary condensation in a disordered mesoporous medium: A grand canonical Monte Carlo study, Molecular Physics 100 (2002) 2059;[5] C.J. Gommes, A.P. Roberts, in preparation. [less ▲]

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See detailRecurrence of GH-secreting pituitary adenoms during puberty in children with germline AIP mutations : a clinical challenge
Filliponi, S; Esposito, V; Daly, Adrian ULg et al

in Endocrine Abstracts (2015, May)

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See detailHow to choose a suitable dissolution test for BCS II drugs?
Thiry, Justine ULg; Pestieau, Aude ULg; Krier, Fabrice ULg et al

Conference (2015, May)

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See detailThe genetic causes of pituitary gigantism
Rostomyan, Liliya ULg; Daly, Adrian ULg; PETROSSIANS, Patrick ULg et al

in Endocrine Abstracts (2015, May)

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See detailPRESPHOTO project - Preservation of microalgae in the BCCM collections
Crahay, Charlotte ULg; Deprez, Karolien; Vanormelingen, Pieter et al

Poster (2015, May)

The implementation of reliable preservation technologies of the biological resources is crucial for the management of the Biological Ressources Centers. PRESPHOTO, a BRAIN.be project, aims to develop and ... [more ▼]

The implementation of reliable preservation technologies of the biological resources is crucial for the management of the Biological Ressources Centers. PRESPHOTO, a BRAIN.be project, aims to develop and optimize new and cost-effective preservation techniques of photosynthetic microalgae (diatoms and cyanobacteria) in the two BCCM collections, BCCM/DCG and BCCM/ULC. This is a critical factor for the future growth and valorisation of these collections. Firstly, the traditional two-step cryopreservation technique will be adapted to photosynthetic microalgae strains. In particular, we will examine the effects of the culture conditions, the type and concentration of cryoprotectants, and the preservation temperature on the survival of microalgae. The encapsulation/dehydration technique as alternative to the two-step cryopreservation method will be also evaluated. Moreover, an independent validation of the developed protocols will be performed by the Culture Collection of Algae and Protozoa (UK) (subcontractor). Secondly, we will perform genome resequencing of selected strains to investigate the genetic changes induced by different cryopreservation techniques. Finally, a high-quality genomic DNA bank will be established and validated. [less ▲]

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See detailContribution of diversified farming systems to the delivery of ecosystem services
Boeraeve, Fanny ULg; Dufrêne, Marc ULg; Dendoncker, Nicolas

Conference (2015, May)

The present contribution introduces an innovative research project analyzing farms which have encompassed a transition towards more sustainability. The project being at its premise, we shall focus the ... [more ▼]

The present contribution introduces an innovative research project analyzing farms which have encompassed a transition towards more sustainability. The project being at its premise, we shall focus the presentation on the innovative aspects of the methodology and expected outcomes with a first introduction on the context and the theoretical framework relied on. [less ▲]

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See detailCerebral FDG uptake changes with supraorbital transcutaneous electrical stimulation for episodic migraine prevention
D'Ostilio, Kevin ULg; Thibaut, Aurore ULg; Laureys, Steven ULg et al

Conference (2015, May)

Background: A recent multicentre RCT has shown that supraorbital transcutaneous stimulation (STS) targeting branches of the ophtalmic nerve with the Cefaly® device is effective as a preventive therapy for ... [more ▼]

Background: A recent multicentre RCT has shown that supraorbital transcutaneous stimulation (STS) targeting branches of the ophtalmic nerve with the Cefaly® device is effective as a preventive therapy for migraine (Schoenen et al., Neurology 2013). However, the mechanisms of action in the central nervous system remain unknown. Here, we conducted voxel-based analyses of [18]FDG-PET to evaluate metabolic changes immediately after the first STS session and after 3 months of treatment in patients with migraine. Methods: Twenty-eight subjects participated in the experiment: 14 patients with episodic migraine (ICHD3 beta criteria) and 14 age-matched controls. Healthy volunteers underwent only one [18]FDG-PET scan whereas patients were scanned at baseline, directly after a first session of STS and after 3 months of daily treatment. Results: Compliant patients showed a significant decrease in the number of attacks (p = 0.03). When compared to controls, patients (n = 14) at baseline were hypometabolic in the fronto-temporal regions (p < 0.001), especially in the orbitofrontal (OFC) and perigenual anterior cingulate cortex. OFC hypometabolism was not correlated with medication intake. In compliant patients, daily STS for 3 months was followed by a normalization of the fronto-temporal hypometabolism (p< 0.001; OFC: pFWE<0.01). Conclusion: Our study suggests that the OFC is hypoactive in episodic migraine. STS with the Cefaly° device is able to normalize this hypoactivity. This indicates that STS exerts its beneficial effect via slow neuromodulatory mechanisms, as also previously shown for percutaneous occipital nerve stimulation in refractory cluster headache (Magis et al., BMC Neurology 2011). [less ▲]

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See detailHigh output [18F]FDOPA on AllInOne (Trasis) at commercial scale
Otabashi, Muhammad; Cascione, Christian; Lemaire, Christian ULg et al

in Journal of Labelled Compounds & Radiopharmaceuticals (2015, May), 58

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See detailEpidemiological aspects and genotypic characterization of strains of Microsporum audouinii isolated in the context of a Belgian National survey on anthropophilic tinea
SACHELI, Rosalie ULg; Dekkers, Charlotte; DARFOUF, Rajae ULg et al

Poster (2015, May)

Objectives The last two years, clinical cases of tinea capitis caused by Microsporum audouinii (M. audouinii), have increased in Belgium. To better understand the emergence of this species in the ... [more ▼]

Objectives The last two years, clinical cases of tinea capitis caused by Microsporum audouinii (M. audouinii), have increased in Belgium. To better understand the emergence of this species in the population, the Belgian National Reference Center (NRC) for dermatophytes launched a national survey in 2013. Epidemiological aspects and genotypic characterization of the strains were included. Methods The study was conducted from March 2013 up to February 2014. All Belgian laboratories were asked to send M. audouinii strains isolated from hair to the NRC with a form to fill in including epidemiological informations. The fungal strains were identified by microscopy or ITS sequencing in case of doubt. The genotypic analysis was performed by the DiversiLab® system (bioMérieux) for DNA fingerprinting and analysis. Epidemiological informations were analyzed with the help of a biostatistician. Results Among the collected isolates, 117 strains have been currently confirmed as M. audouinii. Analysis of the epidemiological characteristics of the infected population shows that the main age category concerns 5-9 year-old children (64%, p< 0,0001) with a sex-ratio M/F of 1.97. Data concerning the geographic origin of the family have been obtained in only 33,6% of the cases. It reveals that strains have been mainly isolated from patients with a Belgian nationality (43,6%) suggesting bias in the data collection. The geographic origin of the remaining group includes several African countries such as Congo (20,61%), Guinea (12,8%) and Burundi (5,12%). The genotypic analysis led to the distinction of 6 genotypic variants of M. audouinii. One of these variants was exclusively recovered from South Belgium (11 strains). The major group was composed of 96 strains, well distributed in different Belgium locations. Two other groups of three strains each were close to the major group but the analysis of the spectral superposition showed some differences between these groups. The two last groups were clearly different from the major group but species identification was confirmed by ITS sequencing. Conclusion The results of the genomic analysis by Diversilab, show that several groups of M. audouinii isolates co-exist in Belgium providing evidence of genetic heterogeneity. However, no clear correlation could be established between the appartenance to a group and epidemiological factors, such as the age or ethnical origin. ________________________________________ [less ▲]

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See detailComparison of individuals’ susceptibility to false memory induced by both DRM and misinformation paradigms involving emotional material
Martial, Charlotte ULg; Dehon, Hedwige ULg

Poster (2015, May)

False memories induced by the DRM procedure (“Deese, Roediger and McDermott”; Deese, 1959; Roediger & McDermott, 1995) or the misinformation procedure (in which a person’s recollection of a witnessed ... [more ▼]

False memories induced by the DRM procedure (“Deese, Roediger and McDermott”; Deese, 1959; Roediger & McDermott, 1995) or the misinformation procedure (in which a person’s recollection of a witnessed event is altered after exposure to misinformation about this event; Loftus et al., 1978) are due to errors in source monitoring processes (e.g., Johnson et al., 1993) and one might expect the correlation between these false memories quite positive. However, the few laboratory studies comparing the DRM paradigm and the misinformation paradigm show small (Zhu et al., 2013) or no correlation (Ost et al., 2013) between the false memories elicited by these procedures but these studies vary in terms of methodological details. For instance, false memories from the misinformation procedure involved emotional content while those from the DRM procedure only included neutral materials. This study investigated the relationship between false memories induced by two different paradigms (a DRM task and a misinformation procedure) both involving an emotional material. Participants (N = 154) completed an emotional variant of the DRM (neutral, positive and negative lists) and the misinformation (neutral, positive and negative images) procedures and their performances on both tasks were compared. Although both paradigms reliably induced false memories in participants, our analyses revealed only a marginally weak positive correlation (r = .147, p = .051) between misinformation and DRM false memories using emotional variants. These results support the idea that DRM and misinformation false memories are underpinned by (at least in part) different mechanisms and that the previous mixed results were not due to the specific content of the DRM or the misinformation task used. [less ▲]

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See detailBiosensor based on optical fibers
Lismont, Marjorie ULg; Vandewalle, Nicolas ULg; Joris, Bernard ULg et al

Poster (2015, May)

Medical diagnosis and biotechnology progresses are strongly dependent on the development of sensing devices, which, ideally, would allow the reliable detection of very low amounts of biological species in ... [more ▼]

Medical diagnosis and biotechnology progresses are strongly dependent on the development of sensing devices, which, ideally, would allow the reliable detection of very low amounts of biological species in various environments. In addition to these requirements, the detection tools would also be easy to use and would rapidly response. Fluorescent based biosensors fulfil most of these characteristics. In our work, the intersection between two crossed optical fibers is used as the basic unit of an original optical biosensor. As illustrated by figure 1, one optical fiber is used to carry probe molecules and excite fluorescence while the second one is devoted to carry the target species and collect the optical signal arising from the species interacting at the node. The advantages of our set-up over traditional optical sensors are no surface functionalization, use of low amounts of biological species, limitation of the denaturation risk, ease to use and low detection threshold. The developed biosensor is validated on two systems. The first one is a fluorescent calcium indicator, Oregon green 488 BAPTA-2, whose optical emission signal is affected by Ca2+ ions concentration. The second one is based on Rh-Con A and FITC-Dextran complex for which the FRET phenomenon is affected by glucose concentration. In both cases, the results are in agreement with the ones obtained in cuvettes attesting the efficiency of the sensing device. We also show a prototype of a multichannel device composed of multiple crossed optical fibers which are used as species and light carriers. [less ▲]

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See detailLearning from blind tests: residues on grinding stones and flaked stone tools
Rots, Veerle ULg; Hayes, Elspeth; Cnuts, Dries ULg et al

Conference (2015, May)

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See detailLarge-scale polarization alignments of quasars in the JVAS/CLASS 8.4-GHz surveys
Pelgrims, Vincent ULg; Hutsemekers, Damien ULg

Poster (2015, May)

We analyse the large sample of polarization measurements of the flat-spectrum radio sources of the JVAS/CLASS 8.4-GHz surveys compiled by Jackson et al. (2007). We tested the uniformity of the ... [more ▼]

We analyse the large sample of polarization measurements of the flat-spectrum radio sources of the JVAS/CLASS 8.4-GHz surveys compiled by Jackson et al. (2007). We tested the uniformity of the polarization position angles for a wide range of angular (2D) and comoving (3D) separations and studied the several subsamples, dividing the main sample of 4155 sources regarding their object type (QSO, galaxies, radio sources,...). We found regions of the sky of about 20 degree radius in which quasars (only) have correlated polarization position angles. Those regions coincide with the regions of alignment at optical wavelength pinpointed in 1998 by Hutsemékers. [less ▲]

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See detailNanometer-scale wetting transitions in mesopores: a SAXS analysis
Gommes, Cédric ULg

Conference (2015, May)

The equilibrium and metastable configurations of confined binary liquids has been a topic of research since the early work of Liu et al. in the nineties [1]. In particular, it has been proposed ... [more ▼]

The equilibrium and metastable configurations of confined binary liquids has been a topic of research since the early work of Liu et al. in the nineties [1]. In particular, it has been proposed theoretically that liquids may coexist inside nanopores in the form of layers covering uniformly the solid surface, of plugs filling locally the pore space, or of capsules floating in the middle of the pores. In the present contribution, we report in situ synchrotron small-angle scattering (SAXS) experiments on hexane/nitrobenzene solutions confined in mesoporous carbon xerogels [2]. The SAXS shows that these systems exhibit reversible temperature-induced transitions between the layer and the plug configurations. The scattering data is analyzed using a so-called plurigaussian model, which enables us to reconstruct the configurations of the confined liquids, and quantitatively analyze the wetting transitions at the nanometer-scale in terms of changing interface areas, contact angles, and triple-line lengths. [less ▲]

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See detailOptical polarization from AGN
Hutsemekers, Damien ULg

Conference (2015, May)

I review the optical polarization properties of both low- and high-luminosity AGN, focusing on the origin of the polarization and its relation to AGN properties, in particular the geometry of the ... [more ▼]

I review the optical polarization properties of both low- and high-luminosity AGN, focusing on the origin of the polarization and its relation to AGN properties, in particular the geometry of the scattering regions. The use of polarization to follow AGN orientations along the large-scale structures will also be discussed. [less ▲]

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See detailSearching for early traces of fire production on flint tools
Sorensen, Andrew; Rots, Veerle ULg

Conference (2015, May)

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See detailOne-year Prevalence of Migraine Using a Validated Extended French Version of the ID MigraineTM: a Belgian Population-Based Study
Schoenen, Jean ULg; Streel, Sylvie ULg; Donneau, Anne-Françoise ULg et al

in Cephalalgia : An International Journal of Headache (2015, May), 35(6), 155-156

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See detailEffects of a walk phase at the warm up onset on physiological and behavioural parameters of ridden horses (Equus caballus)
Jacquot, Marion; Grosjean, Adeline; Emrot, Cassandre et al

Poster (2015, May)

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See detailThe effects of perinatal exposure to polychlorinated biphenyls on hippocampal neurogenesis
Pinson, Anneline ULg; Parent, Anne-Simone ULg; chatzi, christina et al

Poster (2015, May)

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See detailX-linked acro-gigantism (X-LAG) : A new form of infant-onset pituitary gigantism
Trivellin, G; Daly, Adrian ULg; Faucz, FR et al

in Endocrine Abstracts (2015, May)

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See detailAdapting Nitrogen management to the increasing climatic uncertainty
Dumont, Benjamin ULg; Basso, Bruno; Bodson, Bernard ULg et al

in Shirmohammadi, Adel; Bosch, David; Muñoz-Carpena, Rafa (Eds.) Proceedings of the 1st ASABE Climate Change Symposium - Adaptation and Mitigation (2015, May)

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See detailSeagrasses or caged mussels to bioassess the contamination rate of Mediterranean coastal waters? That is the question
Richir, Jonathan ULg; Galgani, François; Benedicto, José et al

in PeerJ (2015, May)

Biological indicators have the capacity to integrate the temporal changes of contaminants, concentrations or fluxes over various time-scales, and are thus considered as interesting tools for water quality ... [more ▼]

Biological indicators have the capacity to integrate the temporal changes of contaminants, concentrations or fluxes over various time-scales, and are thus considered as interesting tools for water quality biomonitoring. Since the mid-70ies, French programs have developed water monitoring approaches based on the use of bivalve molluscs; and recently the natural background and the extent of water contamination were bioassessed at the scale of the whole western Mediterranean. But even if bivalve molluscs are viewed as reliable bioindicators, their use is not always made easy as a result of their absence in numerous coastal regions that force their transplantation (cages) during several months before their sampling and analysis. This weakness led several scientists to evaluate the bioindicator abilities of other marine organisms. Seagrasses, whose ability to bioaccumulate contaminants proportionally to environmental contamination levels has been clearly demonstrated, have thus been proposed as an appropriate alternative tool for coastal water quality assessment. Very little studies have however so far considered the combined utilization of these two groups of bioindicator organisms, i.e. caged bivalve molluscs and seagrasses. In the framework of the STARECAPMED project, we therefore compared and discussed the bioaccumulation of trace elements in the Neptune grass Posidonia oceanica and in caged Mediterranean mussels Mytilus galloprovincialis. The sampling was performed at the scale of the western Mediterranean. The two species told two contamination stories which, although sometimes different, showed to be complementary. P. oceanica and M. galloprovincialis bioaccumulated dissolved trace elements from the water column and thus provided information regarding trace element contamination severity integrated over several days to a few months. Seagrasses, strongly rooted in the sediments, reflected the long-term exposure to trace elements since sediments offer a degree of time integration over several years to decades. Caged mussels, as filter feeder artificially maintained in the water column, bioaccumulated trace elements from their particulate phase, and therefore gave valuable information regarding continental-terrigenous inputs to coastal waters. In conclusion, seagrasses and mussels should neither supplant, nor substitute, but rather complement each other in order to provide the full time- and space-integrated coastal contamination story of the Mediterranean. [less ▲]

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See detailMolecular analysis of miRNA expression profiles in AIP mutation positive somatotropinomas
Falk, N; Daly, Adrian ULg; Beckers, Albert ULg et al

in Endocrine Abstracts (2015, May)

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See detailMapping Posidonia oceanica meadows through time A story of precision, evaluation and fragmentation
Abadie, Arnaud ULg; Jousseaume, Matthieu; Lejeune, Pierre et al

Poster (2015, May)

Over the last decades, the interest in mapping Posidonia oceanica beds has increased along with the improvement of the equipment’s precision of data acquisition. In Calvi Bay (Corsica, France) the meadows ... [more ▼]

Over the last decades, the interest in mapping Posidonia oceanica beds has increased along with the improvement of the equipment’s precision of data acquisition. In Calvi Bay (Corsica, France) the meadows cover an area of about 5 km² and are found at a depth ranging from 3 m to 37 m. The availability of three distinct datasets for 1997, 2002 and 2010 allowed to assess changes in the patchiness of the meadows in the bay and to investigate evolution of maps precision through a surface analysis via GIS software. Thus, three maps were elaborated combining aerial photographs and side scan sonar images. The meadows percentage of cover through time was assessed using four bathymetric sections: 0-10 m, 11-20 m, 21-30 m and 31-40 m. Differences in the patchiness of P. oceanica meadows between 1997 and 2010 appear to be moderate (less than 3 %) in the sections 0-10 m and 11-20 m and then greatly increase with depth: 24 % at 21-30 m and 39 % at 31-40 m. This amazing regression seems hardly natural and unlikely given the slight quantity of human activities that can cause damages on the P. oceanica meadows of the Calvi Bay. These results are likely to be mainly due to the improvement of precision and resolution of the aerial photographs (5 m in 1997, 0.8 m in 2002 and 0.5 m in 2010) and sonar images (5 m in 1997, 3 m in 2002 and 0.5 m in 2010). An issue of habitat determination (human vs instrumental) linked with the method adopted for mapping can also cause differences in the percentage of cover. Given the different accuracy among the three maps, the real regression and fragmentation of P. oceanica meadows could be hardly assessed. However, in several areas where the human activities are important, a clear regression or even a disappearance of the meadows has been observed. It is obvious that the last maps are more accurate than the previous ones and, thus, the former can be used for management purpose as well as for study on the patchiness; however, they still keep uncertainty no matter which method is used to create them. [less ▲]

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See detailUse of 454 pyrosequencing protocol for the assessment of cyanobacterial diversity
Stelmach Pessi, Igor ULg; De Carvalho, Pedro; Laughinghouse, Haywood Dail et al

Poster (2015, May)

A pilot run was carried out on Antarctic microbial mat samples in order to test different protocols for 454 pyrosequencing and bioinformatic analyses. An artificial community was assembled using22 ... [more ▼]

A pilot run was carried out on Antarctic microbial mat samples in order to test different protocols for 454 pyrosequencing and bioinformatic analyses. An artificial community was assembled using22 cyanobacterial strains in two different abundance distributions. Bioinformatic analyses were carried out on the artificial communities using variations of the mothur and UPARSE pipelines. Moreover, different DNA extraction methods, technical replicates and biases arising from direct barcoded primer amplification were assessed using five microbial mat and soil crust samples. A great variation in richness estimates was observed using different bioinformatic pipelines, with UPARSE generating the most consistent results. On the other hand, community structures observed using different DNA extraction protocols were statistically similar. The same was observed for the technical replicates. Moreover, the use of barcoded primers did not influence the observed community structure. [less ▲]

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See detailRegiospecific radiolabeling of Nanofitin on Ni Magnetic Beads with 18F-FBEM and in vivo PET studies
Dammicco, Sylvestre ULg; Lemaire, Christian ULg; Cinier, Mathieu et al

Poster (2015, May)

Nanofitins(NFs) are a small, single chain and cysteine-free protein able to selectively bind a defined biological target. They derive from Sac7d bacterial protein family and are highly stable over a wide ... [more ▼]

Nanofitins(NFs) are a small, single chain and cysteine-free protein able to selectively bind a defined biological target. They derive from Sac7d bacterial protein family and are highly stable over a wide range of pH (0-13) and temperature (Tm ~80°C). Their extreme stability, low cost and high tolerability for chemical coupling make NFs an interesting alternative to antibodies. The aim of this study was to develop the first synthesis of a radiolabeled NF since no in vivo biodistribution kinetic studies have been published. [less ▲]

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See detailSoft bottom macrofauna monitoring under anthropogenic influences in Calvi bay, Corsica: Methodological simplifications
Donnay, Annick ULg

Conference (2015, May)

This work is within the framework of STARE-CAPMED long-term research program of STARESO dedicated to STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on ... [more ▼]

This work is within the framework of STARE-CAPMED long-term research program of STARESO dedicated to STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystem Drifts. For the soft-bottom macrofauna topic, fourteen stations are sampled one to two times per year, along gradients from anthropogenic sources of influence (river mouth, fish farm, anchoring areas and sewage) mere 2 stations out of influences. The sorting and analysis of soft-bottom macrofauna is time consuming and some methodological simplifications are looking for. Moreover, an adaptation of the M-AMBI for the weak human impacted geographic zone, the Corsica, is envisaged by a weighting with the Piélou index. As a first time, all is done at the species level. In a second time, the steps are done at genus and family levels. By comparison of results obtained between different identification levels, the taxonomic sufficiency (TS) for the Corsican coastal waters is determined. The adapted M-AMBI calculation and TS are applied on the macrofauna populations identified in Calvi bay. It could be interesting to test the analysis process applied around Corsica on other Mediterranean areas. [less ▲]

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See detailLong-wave infrared digital holographic interferometry for deformation measurement of the segmented detector array of the space EUCLID mission
Vandenrijt, Jean-François ULg; Thizy, Cédric ULg; Beaumont, Florent et al

in Digital Holography and Three-Dimensional Imaging (2015, May)

Digital holographic interferometry in LWIR is used for following the deformation and relative movement of an assembly of detectors to be used in space. The setup is incorporated in a vacuum chamber for ... [more ▼]

Digital holographic interferometry in LWIR is used for following the deformation and relative movement of an assembly of detectors to be used in space. The setup is incorporated in a vacuum chamber for cryogenic testing. [less ▲]

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See detailFractured bedrock investigation by using high-resolution borehole images and the Distributed Temperature Sensing technique
Radioti, Georgia ULg; Delvoie, Simon ULg; Radu, Jean-Pol ULg et al

in ISRM Congress 2015 Proceedings - Int’l Symposium on Rock Mechanics (2015, May)

In order to investigate the fracturing of the bedrock and its possible heterogeneous distribution in situ, four boreholes equipped with double-U geothermal pipes of 100 m long were installed on the campus ... [more ▼]

In order to investigate the fracturing of the bedrock and its possible heterogeneous distribution in situ, four boreholes equipped with double-U geothermal pipes of 100 m long were installed on the campus of the University of Liege (Liege, Belgium) over a surface area of 32 m². The bedrock, which starts at a depth approximately of 8 m, is quite fractured and consists mainly of siltstone and shale interbedded with sandstone. Different geophysical methods are applied at two different phases, after drilling the boreholes and after injecting the grouting material. The first approach consists in lowering an ultrasonic borehole imager (borehole televiewer; Zemanek, Glenn, Norton, & Caldwell, 1970), an instrument that acts as an ultrasonic transducer and receiver, into the boreholes to obtain high-resolution, continuous images with 360° coverage of the local geology and fracturing. Moreover gamma-ray logs of the four boreholes are obtained and inclinometry is conducted. After drilling the boreholes fiber optic cables are attached along the pipe loops and the double-U pipes are installed inside the boreholes. Then the grouting material is injected. The second approach consists in measuring the temperature along the fibers by applying the Distributed Temperature Sensing technique (Soto, Sahu, Faralli, Bolognini, Di Pasquale, Nebendahl, & Rueck, 2007). A laser pulse is injected into the optical fiber and the temperature along the fiber is determined by the intensity of Raman stokes and anti-stokes reemitted signals. Temperature evolution is measured during hardening of the grouting material. Local maxima of the temperature curve are probably due to a local lower thermal conductivity and/or a local larger quantity of grouting material due to gathering of fractures. A detailed fracture characterisation (position, opening, orientation, dip angle) is obtained based on the acoustic signal travel time and amplitude. The fractures are characterised by the same dipping and orientation but significantly vary in number and location in the four boreholes, despite the close distance between them. Gamma-ray data and observation of the cuttings during drilling result in rock identification through depth as well as in determination of the layer dipping. The inclination of the four boreholes tends to be perpendicular to the dipping. The combination of the two geophysical methods as presented provides information useful for the hydro-thermo-mechanical behaviour of the bedrock. The contribution of the thermal behaviour of borehole heat exchangers to bedrock investigation will be further studied by conducting Distributed Thermal Response tests (Fujii, Okubo, & Itoi, 2006). During the tests we will measure the temperature variation thanks to the installed fiber optics. These data will allow us to correlate any anisotropic thermal behaviour to the geological characteristics. The available information could be used for a detailed numerical model. [less ▲]

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See detailLes réseaux scientifiques du Roi en Belgique
Pirot, Pascal ULg

Conference (2015, April 30)

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See detailIn silico screening to predict chondrocyte hypertrophy using a semiquantitative gene network model
Kerkhofs, Johan ULg; Leijten, Jeroen; Luyten, Frank et al

Poster (2015, April 30)

PURPOSE: In development, chondrocyte hypertrophy is a crucial and well-studied step in endochondral ossification. Hypertrophy may also play a role in pathophysiological processes, including osteoarthritis ... [more ▼]

PURPOSE: In development, chondrocyte hypertrophy is a crucial and well-studied step in endochondral ossification. Hypertrophy may also play a role in pathophysiological processes, including osteoarthritis. We employ a computational approach to estimate the effect of individual factors in this complex process. METHODS: We have combined information gleaned from a high number of publications on chondrocyte differentiation into a gene regulatory network of 46 factors and over 150 interactions. This network can estimate the stability of proliferative chondrocytes/permanent cartilage (stable state with SOX9 activity) and hypertrophic chondrocytes (stable state with RUNX2 activity) by employing 2 measures. A first measure is a Monte Carlo analysis that assesses stability in the face of random initial conditions, the second modifies stable states to estimate the sensitivity to perturbation. RESULTS: For each factor, these qualitative measures are calculated in silico under knockout and overexpression conditions and compared to the wild type situation. This enables screening of the effects of all incorporated factors on cartilage homeostasis, differentiation and pathogenesis via the initiation of hypertrophy. Indeed, our gene network analysis indicated multiple candidate genes for the development of osteoarthritis. Factors that amplify the SOX9 attractor basin include TGFβ, PPR, IGF-I, and PKA. The presence of RAS, IHH, GLI2 and FGF is required for the Runx2 stable state. Using a literature study, we corroborated several of the proposed factors. CONCLUSIONS: In silico screening of overexpression and knockout presents a novel strategy to improve bone and cartilage tissue engineering approaches, and can be used to propose a list of putative therapeutic targets for e.g. osteoarthritis. [less ▲]

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See detailWhat does Radius stand for? Issues and learning from the creation of an institutional reporting comittee in a university
Hoerner, Céline ULg; Bachelet, Jean-François ULg

Conference (2015, April 29)

The contemporary university has to deal with an important pressure in order to adopt an operating and organisational system from the companies. The university is now encouraged to reconcile efficacy and ... [more ▼]

The contemporary university has to deal with an important pressure in order to adopt an operating and organisational system from the companies. The university is now encouraged to reconcile efficacy and financial viability goals in a competitive context between institutions. On the basis of a case study undertaken in a french--¿speaking Belgian university, we will think about the way dashboards and institutional reporting enable the university to respond to change injunctions, how they constitute a strategic management support, as well as the effects of their implementation in the administrative organisation. We will explain why Radius has been created at the university, its structure and how it works. We will see that its impact has been significant on the institution¿s staff. The creation of Radius, which aroused misgivings from administrations who have lost some of their prerogatives, reflects a shift of the administrative activity, whose part of the power is now concentrated in the hands of the authorities. [less ▲]

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See detailFunctions of binary variables
Crama, Yves ULg

Conference (2015, April 29)

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See detailRural development through the introduction of improved goats: case of Attapeu, Lao PDR
Andres, Ludovic ULg; Nguyen Cong, Oanh; Dinh Van, Tong et al

Conference (2015, April 29)

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See detailEpidemiological aspects and genotypic characterization of strains of Microsporum audouinii isolated in the context of a Belgian National survey on anthropophilic tinea
SACHELI, Rosalie ULg; Géron, Bénédicte; Dekkers, Charlotte et al

Poster (2015, April 28)

Objectives The last two years, clinical cases of tinea capitis caused by Microsporum audouinii (M. audouinii), have increased in Belgium. To better understand the emergence of this species in the ... [more ▼]

Objectives The last two years, clinical cases of tinea capitis caused by Microsporum audouinii (M. audouinii), have increased in Belgium. To better understand the emergence of this species in the population, the Belgian National Reference Center (NRC) for dermatophytes launched a national survey in 2013. Epidemiological aspects and genotypic characterization of the strains were included. Methods The study was conducted from March 2013 up to February 2014. All Belgian laboratories were asked to send M. audouinii strains isolated from hair to the NRC with a form to fill in including epidemiological informations. The fungal strains were identified by microscopy or ITS sequencing in case of doubt. The genotypic analysis was performed by the DiversiLab® system (bioMérieux) for DNA fingerprinting and analysis. Epidemiological informations were analyzed with the help of a biostatistician. Results Among the collected isolates, 97 strains have been currently confirmed as M. audouinii. Preliminary analysis of the epidemiological characteristics of the infected population shows that the main age category concerns 5-9 year-old children (84%) with a sex-ratio M/F of 1.95. Data concerning the geographic origin of the family have been obtained in only 45.8% of the cases. It reveals that strains have been mainly isolated from patients with a Belgian nationality (77%) suggesting bias in the data collection. The geographic origin of the remaining group (23%) includes several African countries. The genotypic analysis led to the distinction of 3 genotypic variants of M. audouinii. One of these variants was exclusively recovered from South Belgium (11 strains). The major group was composed of 85 strains, well distributed in different Belgium locations. The last group contains only one strain but this strain was significantly different from the two other variants. Conclusion The automated typing DiversiLab® system proved to be an easy and efficient method to investigate the molecular epidemiology of dermatophytes infections. These preliminary results show that, through Belgium, several groups of isolates co-exist for M. audouinii providing evidence of genetic heterogeneity. At this time all epidemiological informations have not yet been assessed while 35 strains of M. audouinii remain to be analysed genotypically to give definitive conclusions. [less ▲]

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See detailComplexes et complexions de Mach à Meinong
Zincq, Aurélien ULg

Conference (2015, April 27)

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See detailLes méthodes de prise en charge et de rééducation cognitives
DELRUE, Gaël ULg

Conference (2015, April 25)

Présentation des méthodes de prise en charge neurocognitives de patients traumatisés crâniens légers.

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See detailEvaluation of a commercially developed semi-automated PCR-surface enhanced raman scattering assay for the detection of Candida species in blood
HAYETTE, Marie-Pierre ULg; WERY, Marie ULg; BOREUX, Raphaël ULg et al

Poster (2015, April 25)

Objectives Microbiological diagnosis of invasive candidiasis is still dependent on culture-based methods. The use of beta-D-glucan antigen detection is included in the EORTC microbiological diagnostic ... [more ▼]

Objectives Microbiological diagnosis of invasive candidiasis is still dependent on culture-based methods. The use of beta-D-glucan antigen detection is included in the EORTC microbiological diagnostic criteria but is rarely available in the clinical labs. On the other hand, PCR-based methods lack standardization. The RenDx Fungiplex® is a new commercially available semi-automated PCR SERS assay designed for the detection of Aspergillus sp. and Candida sp. including the differentiation of resistant strains as C. glabrata, C. krusei and A. terreus. This study was performed for sensitivity and reproducibility testing of the method on 8 different Candida species. Methods The study was conducted on EDTA-blood collected from a healthy donor. Blood samples were spiked with 10 Candida reference strains: C. albicans ATCC 10231, C. albicans NEQAS 1206 and C. albicans NEQAS 2359; C. glabrata ATCC 90030 ; C. krusei ATCC 6258 ; C. tropicalis NEQAS 1036 ; C. guillermondii NEQAS 1035 ; C. parapsilosis ATCC 22019 ; C. lusitaniae NEQAS 1511 and C. dubliniensis IHEM 14280. Spiked samples were diluted at final concentrations ranging from 1 CFU/mL to 1000 CFU/mL. Cultures on Sabouraud dextrose agar were performed in parallel to control yeasts dilutions. DNA extraction was performed by using proteinase K-based method followed by purification on QIAcube automate. The RenDx Fungiplex®kit (Renishaw) was used for the amplification process and the final detection was processed on the SP-1000 sample analyzer. Reproducibility testing was performed on the three C. albicans reference strains by repeating each test 5 times. Results A total of 142 samples were included in the study. A sensitivity of 10 CFU/mL was reached for C. glabrata, C. krusei, C. tropicalis, C. dubliniensis spiked samples while C. lusitaniae and C. tropicalis performed better at 1 CFU/mL. The three tested reference C. albicans strains and C. guillermondii gave the lowest sensitivity (100 CFU/mL). The reproducibility of the assay was 96% Conclusion RenDx Fungiplex®kit allows the detection of the most frequent Candida species responsible for invasive candidiasis in spiked blood samples. The sensitivity of the test is comprised between 10 and 100 CFU/mL for most Candida sp. and reproducibility is very high. This evaluation allows us to consider this commercial kit for inclusion in a clinical study on invasive candidiasis in comparison with non-molecular diagnostic assays. [less ▲]

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See detailWerner Herzog et Alexander Kluge. Regards croisés sur le Nouveau Cinéma Allemand.
Hamers, Jérémy ULg

Conference (2015, April 25)

Alexander Kluge et Werner Herzog sont assurément deux figures antipodiques dans l’histoire du cinéma allemand. L’engagement politique tout d’abord, indissociable de la création audiovisuelle pour le ... [more ▼]

Alexander Kluge et Werner Herzog sont assurément deux figures antipodiques dans l’histoire du cinéma allemand. L’engagement politique tout d’abord, indissociable de la création audiovisuelle pour le premier, objet de méfiance si pas de rejet pour le second, oppose manifestement ces deux figures de proue du Nouveau Cinéma Allemand, un courant dont l’acte de naissance, le manifeste d’Oberhausen de 1962, coïncide avec les débuts cinématographiques des deux auteurs. Leurs esthétiques respectives ensuite confirment le gouffre irréductible qui semble les séparer. Enfin, auteurs l’un et l’autre d’œuvres théoriques sur le cinéma, ils défendent deux approches réflexives de la création audiovisuelle qui apparaissent a priori comme inconciliables. En première lecture, Kluge et Herzog incarnent donc toute l’hétérogénéité bien connue du Nouveau Cinéma Allemand. À rebours de ce constat largement répandu dans les histoires de ce courant cinématographique, et sans pour autant réconcilier les deux auteurs à tout prix, un regard croisé sur quelques-uns de leurs films (e.a. Gelegenheitsarbeit einer Sklavin et Die Artisten in der Zirkuskuppel : ratlos pour Kluge ; Fata Morgana et Fitzcarraldo pour Herzog) et textes (e.a. les écrits d’Ulm de Kluge et la déclaration du Minnesota de Herzog) permet de dégager plusieurs points de rencontre entre les œuvres des deux cinéastes. Partant plus particulièrement de leurs conceptions de la rencontre entre documentaire et fiction, rencontre essentielle pour l’un comme pour l’autre, il s’agira d’en dégager les similitudes et résonances pour mieux comprendre, grâce à un éclairage réciproque, l’une et l’autre de ces œuvres essentielles du cinéma allemand des années soixante, septante et quatre-vingt. [less ▲]

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See detailAge at Retirement: New Proxy of Cognitive Reserve? Results from a French Population-Based Study
Grotz, Catherine ULg; Meillon, Céline; Amieva, Hélène et al

Conference (2015, April 25)

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See detailRetour au travail après un cancer du sein
Mairiaux, Philippe ULg; Schippers, Nathalie ULg; DESREUX, Joëlle ULg et al

Conference (2015, April 23)

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See detailDocuments officiels romains d’époque républicaine et du Principat d’Auguste
Famerie, Etienne ULg

Conference (2015, April 23)

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See detailModelling of stress field evolution in bimetallic rolling mill rolls during the manufacturing process
Gilles, G.; Neira Torres, I.; Tchuindjang, Jérôme Tchoufack ULg et al

in Proceedings of the 5th Conference on rolling mill rolls for metals processing Rolls 5 2015 (2015, April 22)

This paper presents a study of the phase transformation histories and stress profiles in a typical bimetallic roll subjected to a post-casting cooling followed by a tempering heat treatment. The ... [more ▼]

This paper presents a study of the phase transformation histories and stress profiles in a typical bimetallic roll subjected to a post-casting cooling followed by a tempering heat treatment. The simulations are performed using the non-linear finite element code "Lagamine" and a thermo-mechanical-metallurgical model able to take into account coupled effects. The sensitivity of the finite element results to some parameters which are not accurately identified is investigated. [less ▲]

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See detailStudy of a new splice variant of Neuropilin-1: antagonistic functions in the regulation of cancer progression?
Hendricks, Céline ULg; Janssen, Lauriane; Delcombel, Romain et al

Poster (2015, April 22)

Neuropilin-1 (NRP1) is a transmembrane glycoprotein and a co-receptor for several growth factors, for example some variants of the Vascular Endothelial Growth Factor A (VEGF-A). It largely contributes to ... [more ▼]

Neuropilin-1 (NRP1) is a transmembrane glycoprotein and a co-receptor for several growth factors, for example some variants of the Vascular Endothelial Growth Factor A (VEGF-A). It largely contributes to the regulation of angiogenesis but also to cancer formation. NRP1 can be considered as a proteoglycan as glycosaminoglycans side chains can be added on serine 612. Currently, six splice variants of NRP1 have been described. An additional form was recently identified in our laboratory. Depending upon the cell types, it represents 20-30% of the total amount of NRP1. As compared to the full size NRP1 (NRP1-FS), 7 amino acids are deleted. As the missing sequence is located 2 amino acids downstream of the Ser612 required for glycosaminoglycans addition, this process could be somehow affected and the function of the protein could be modified. The glycosylation of NRP1-FS and -Δ7 was analyzed in different cells overexpressing each isoform. Western blotting analyses suggested that NRP1-Δ7 was less glycosylated than NRP1-FS. Prostate cancer cells (PC3) were engineered to express NRP1-FS or –Δ7 only in the presence of doxycycline. The migration of these cells was analyzed by scratch assay, with or without doxycycline in the medium. As compared to controls and to NRP1-FS-expressing cells, production of NRP1-Δ7 was linked to a reduction of cell migration. A DNA dosage showed that NRP1-FS enhanced cell proliferation, while NRP1-Δ7 reduced it. Tumor growth was assessed in vitro by a culture in soft agar. As compared to control conditions, expression of NRP1-FS by doxycycline increased colonies formation. By contrast, NRP1-Δ7 inhibited colonies number, suggesting an inhibition of tumorigenesis by this variant. As PC3 cells express basal level of endogenous NRP1, this suggests some competitive inhibition of NRP1 functions by NRP1-Δ7. Finally, the function of each variant was investigated in vivo in a model of injection in the flanks of nude mice of PC3 cells conditionally expressing NRP1-FS or -Δ7. As compared to the control, NRP1-FS increased tumor size and weight. By sharp contrast, the expression of NRP1-Δ7 was associated with a reduction of tumorigenicity. Cells with forced expression of NRP1-Δ7 also developed fewer blood vessels as compared to the control. These results suggest that NRP1-Δ7 have an antagonistic action on cancer formation and angiogenesis. [less ▲]

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See detailDoctors, Nurses and Patients 2.0: Myth or Reality?
Slomian, Cynthia ULg

Conference (2015, April 21)

This communication aims at drawing the general context underlying the Belgian health care sector and to address the key issues of the computerization of the patient health records. Two case studies are ... [more ▼]

This communication aims at drawing the general context underlying the Belgian health care sector and to address the key issues of the computerization of the patient health records. Two case studies are presented: the introduction of a nursing health record within a hospital and the computerization of the general practitioner's record. Finally, the discussion focuses on the medical knowledge in general, using the embodied, inscribed, enacted phenomenology developed by Richard Freeman and Steven Sturdy. [less ▲]

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See detailSedimentary impacts of recent moderate earthquakes in different settings in the Western Gulf of Corinth, Greece
Beckers, Arnaud ULg; Mortier, Clément; Beck, Christian et al

Poster (2015, April 21)

11 short gravity cores retrieved in the Western Gulf of Corinth, Greece, allowed identifying event deposits whose age ranges were compared to an updated earthquakes catalogue for the area. 210Pb-derived ... [more ▼]

11 short gravity cores retrieved in the Western Gulf of Corinth, Greece, allowed identifying event deposits whose age ranges were compared to an updated earthquakes catalogue for the area. 210Pb-derived age-depth curves show that the majority of the event deposits may have been triggered by earthquakes. These results show that moderate earthquakes (Mw ~6.0-6.5) may significantly impact different marine settings, from shallow shelves (70-100 m deep) to the basin floor (330 m deep). The deepest coring sites show the best possible record, but one major earthquake is missing and the age of one event deposit does not fit with any known earthquake. More cores are needed to check the spatial extent of each deposit and to validate the absence of record of some earthquakes, like the 1995 Aigion earthquake. [less ▲]

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See detailHeat survival of Clostridium difficile spores in ground meat during cooking process
Rodriguez Diaz, Cristina ULg

Poster (2015, April 21)

Introduction: Clostridium difficile is a spore-forming pathogen considered as a major cause of enteric disease in humans, with faecal-oral route as the primary mode of transmission. However, recent ... [more ▼]

Introduction: Clostridium difficile is a spore-forming pathogen considered as a major cause of enteric disease in humans, with faecal-oral route as the primary mode of transmission. However, recent studies have reported the occurrence of C. difficile in ground meats at retail stores, indicating that foods could be an additional source of infection in the community. Purpose: The objective of this study was to determine the resistance of C. difficile spores in contaminated ground meat during cooking process. Methods: Prior to testing, to obtain spores and to enhance heterogeneity, spores of two different strains were produced in two nutritious broths. C. difficile spores were experimentally inoculated in 45 g of ground meat (beef and pork) in order to obtain a final contamination of 4,500 ufc g-1. Six heating temperatures (70, 75, 80, 85, 90 and 95°C) were chosen. Samples were heating in a water bath with an integrated program for time-temperature. One sample without inoculum was used as control with a temperature probe placed inside. Once the desired temperature was research in the core of the sample, the heat treatment was prolonged for 10 min. Subsequently, all the samples were placed on the chilling room (4°C) before analyse. These experiments were conducted in duplicate with a spore enumeration in triplicate. Results: Heating contaminated ground meat at 70, 75 and 80°C for 10 min was not effective for C. difficile spores inhibition. However, 10 min of heat shock at 80°C was the only temperature that significantly reduced the number of countable colonies. Heat treatment at 85°C (or more) inhibits the germination of both of the strains tested. Significance: Ensure that ground meat, like burgers or sausages, is heated to more than 85°C would be an important measure to reduce the risk of C. difficile food transmission. [less ▲]

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See detailThermodynamik und Reaktions-Technik am Beispiel PA12
Pfennig, Andreas ULg; Haas, Thomas

Conference (2015, April 18)

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See detailBrazil’s South South Cooperation with Africa : a win win Relationship ? The case of biofuel production in Mozambique
Cusson, Gabrielle ULg

Conference (2015, April 18)

Since Lula’s presidency, South-South development cooperation (SSDC) has been at the heart of Brazil foreign policy priorities. Brazil is now recognized as an emerging actor in international development ... [more ▼]

Since Lula’s presidency, South-South development cooperation (SSDC) has been at the heart of Brazil foreign policy priorities. Brazil is now recognized as an emerging actor in international development cooperation considering its financial investments and the deployment of its many technical cooperation projects. Despite its cooperation in its own region, Brazil mobilizes a considerable amount of resources towards SSDC in Africa, and especially in Portuguese speaking countries, where it develops a “solidarity diplomacy”. Among the many technical cooperation partnerships, two fields of SSDS are considered as priorities for Brazil in Africa; agriculture and biofuels production. Being one of the world most important agricultural producer and exporter and due to the fast growing of its agribusiness industry, Brazil possess a specific expertise he wishes to share with Africa to support its agricultural revolution and to insure its food and energy security. Therefore, Mozambique has been identified as a privileged partner to develop agricultural projects, including biofuels production. Among others, ProSAVANA, a trilateral cooperation project developed in collaboration with Japan, is a very important, but controversial project. Being an emerging country, Brazil has its own strategic, political and commercial interests. Therefore, it is relevant to ask ourselves if an emerging country can deploy a selfless SSDC policy and establish a win win relationship? Is Brazil’s SSDC policy motivated by principles of solidarity or is more of a tool to consolidate its status as a global power? This papers wishes to analyses the real motivations behind Brazil’s SSDC towards Africa. [less ▲]

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See detailLes documents administratifs du recto du P.Vat. Gr. 11
Ricciardetto, Antonio ULg

in Amato, Eugenio; Marganne, Marie-Hélène (Eds.) Le traité "Sur l'exil" de Favorinos d'Arles. Papyrologie, philologie et littérature (2015, April 17)

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See detailLiposomes entrapping apigenin for the treatment of glioblastoma
Karim, Reatul ULg; Palazzo, Claudio ULg; Dubois, Nadège ULg et al

Poster (2015, April 17)

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See detailBasement depth and sedimentary infill from deep seismic reflection data at the western tip of the offshore Corinth Rift
Beckers, Arnaud ULg; Tripsanas, Efthymios; Hubert, Aurelia ULg et al

Conference (2015, April 17)

The Corinth rift is a young continental rift located in central Greece. The active part of the rift forms an E-W striking depression – the Gulf of Corinth – that is the deepest in its central part ... [more ▼]

The Corinth rift is a young continental rift located in central Greece. The active part of the rift forms an E-W striking depression – the Gulf of Corinth – that is the deepest in its central part. Extensive seismic surveys have imaged the basin's basement and allowed to estimate the total extension across most of the Gulf except its western tip. Extension is high in the central part and decreases westward and eastward, as reflected in the present-day bathymetry. Two decades of GPS measurements have shown that the extension rate increases westwards from ~5 to 10-15 mm yr-1, but this is not consistent with the long term pattern. However, no data allowed so far to estimate the basement depth at the western tip of the Gulf, where the geodetic extension rate is the largest. Such data would allow to check the apparent inconsistency between the present rate and the long-term estimates of crustal extension. We present here an unpublished multichannel seismic line dating from 1979 and crossing the western tip of the Gulf of Corinth. The line is 22 km long and strikes WNW-ESE, from the Mornos delta to the West-Channel fault. A Maxipulse source has been used, allowing to image the basement below the synrift sedimentary infill. To the east, a ~1.6 km deep basin is imaged between the southern margin of the Gulf and an inactive south-dipping fault located between the Aigion and the Trizonia faults. The sedimentary infill consists in an alternation between basin-focused bodies made of incoherent reflections and more extensive high-amplitude reflectors. Attributing this alternation to eustatic variations give an age of 300-350 ka to the oldest well imaged deposits. Northwest of the Trizonia fault, the basement is imaged at shallower depth, i.e. ~450 m. The western tip of the seismic line reaches the Mornos delta, close to the northern shoreline. There, the depth to the basement is larger, reaching ~1.2 km. The infill is made of 3 units : on the basement lies a thin unit of incoherent reflections that may corresponds to coarse-grained fluvial deposits. A second unit of parallel, high-amplitude, low-frequency reflections could represent deeper-water deposits. The last seismic unit represents the Mornos delta coarse-grained deposits, from 0 to ~0.7 km deep. The depth of the basement deduced from this seismic line at the western tip of the Gulf of Corinth (1.2-1.6 km) is shallower than the one in the central part of the Gulf (2.5-3 km). This reinforce the inconsistency between long-term and short-term rates of extension in the Corinth Rift, which may be explained by assuming that the Western Corinth Rift initiated much later than the Central Rift. These data also allow to constrain the total displacement on the N-dipping Psathopyrgos fault, one of the major, normal, basin-bounding faults at the western tip of the Rift. The total offset would reach 2.1-2.3 km and the uplift/subsidence ratio would be ~1:1.7, implying a slip rate of 2.2-2.5 mm yr-1 based on footwall uplift rate data. [less ▲]

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See detailTSP model for electric vehicle deliveries, considering speed, loading and path slope.
Bay, Maud ULg; Limbourg, Sabine ULg

Conference (2015, April 17)

In the current Transport White Paper, the European Union presents a roadmap for a more competitive and sustainable European transport system. Concerning Urban Freight Transport, responsible for about a ... [more ▼]

In the current Transport White Paper, the European Union presents a roadmap for a more competitive and sustainable European transport system. Concerning Urban Freight Transport, responsible for about a quarter of CO2 emissions of the transport sector, one of the goals of the EU is to achieve essentially CO2-free city logistics in major urban centres by 2030 by developing and deploying new and sustainable fuels and propulsion systems. The gradual phasing out of ‘conventionally-fuelled’ vehicles from the urban environment contributes to reduce oil dependence, greenhouse gas emissions and local air and noise pollution. To meet European air quality standards, authorities of some major European cities have already introduced Low Emissions Zones where access to urban areas is limited to freight vehicles that meet certain emissions standards. Greater use of low-emission urban trucks based on electric, hydrogen and hybrid technologies would reduce air emissions, but also noise, letting to use road infrastructure more efficiently by making night deliveries and avoiding morning and afternoon peak periods. In addition to their role in the reduction of polluting emissions, the development of low-emission vehicles also allows to mitigate the dependence of the transportation sector to high fossil fuel prices. Electric vehicles have the potential to be powered by renewable energy sources such as wind and solar energy. However, weaknesses can be found in the limited capacity of the battery and the time needed to recharge, and consequently, the limited driving range of electric vehicle. The main sources for final energy consumption are the vehicle size and the engine characteristics, the load factor, the driving pattern, the gradient which represent the average topology of the country, the speed and the acceleration. To maximize the driving range, a routing model, which aims at minimizing the energy consumption, has to be developed. Our paper focus on the Electric Vehicle Traveling Salesman Problem (EV-TSP): given n cities, find the shortest tour, i.e., the shortest directed cycle containing all cities. The classical objective is to minimize the cost tour scheduling to fulfill delivery requests at each location. In this paper we consider the energy cost and we present an extension of the classical problem to minimize the remaining storage capacity of all electric vehicles at the destination node, knowing that there is no recharge operation on the tour. The objective function accounts not just for the travel distance but also on the load of the vehicle and on its speed while the energy consumption of the engine additionally depends on the path to travel, on the slope of the roads and on the vehicle specifications. Moreover, negative consumption that may happen due to regenerative breaking and kinetic energy capture on downhill paths is taken into consideration. Mathematical model is described and computational experiments are performed. [less ▲]

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See detailLire les textes informatifs au début du secondaire : d’un dispositif didactique à l’étude de l’activité des élèves et à l’accompagnement du travail d’appropriation/transformation des enseignants
De Croix, Séverine ULg; Wyns, Marielle

Conference (2015, April 17)

Notre intervention s’appuie sur les premières données issues d’une recherche de type quasi expérimental , subventionnée par la Fondation Louvain (UCL – Louvain-la-Neuve), qui porte sur l’enseignement ... [more ▼]

Notre intervention s’appuie sur les premières données issues d’une recherche de type quasi expérimental , subventionnée par la Fondation Louvain (UCL – Louvain-la-Neuve), qui porte sur l’enseignement, dans l’ordinaire de la classe, des pratiques de lecture et d’écriture des textes informatifs requises pour réussir à l’école (Bautier et Rayou, 2009 ; Crinon, 2011). « Lirécrire pour apprendre » a pour objectifs (1) d’expérimenter, durant deux années scolaires consécutives, un programme didactique conçu comme une réponse à la prise en charge de difficultés langagières que rencontrent de nombreux élèves face aux usages proprement scolaires des écrits documentaires ; (2) de tester la validité de cet outil auprès d’un échantillon constitué de 90 classes de français du premier degré ( Cèbe & Goigoux, 2007) et (3) d’évaluer les conditions d’implémentation et de mise en œuvre du programme (en termes de formation et d’accompagnement des enseignants) les plus à même de favoriser et de maintenir le changement pédagogique (Rowan & Miller, 2007 ; Dumay, 2009). Dans le cadre de cette communication, nous nous proposons de déplier succinctement les difficultés de lecture et d’écriture identifiées en amont de la conception des cinq modules du programme et de présenter les leviers d’action mobilisés au sein de ceux-ci. Le cœur de la contribution portera ensuite sur l’examen de verbalisations et de traces écrites de l’activité des élèves à l’occasion des deux premiers modules du programme mis en œuvre, intitulés « Se familiariser avec les usages des écrits à visée informative, explicative et justificative » et « Sélectionner des informations dans un ou plusieurs texte(s) et les lier entre elles ». Notre analyse des diverses verbalisations générées par ces modules vise la description qualitative de l’activité des élèves en réaction à l’outil pédagogique que nous introduisons et aux supports et documents qu’ils sont amenés à exploiter. Sera également abordée la question de l’appropriation de l’outil par les enseignants. L’examen des verbalisations produites par ces derniers au cours des séances d’accompagnement (dont bénéficient six équipes partenaires) permettra d’observer les écarts et les lieux de convergence entre, d’une part, les pratiques habituelles des enseignants et, d’autre part, les supports et activités proposés par le programme. Nous verrons dans quelle mesure l’implémentation de l’outil didactique dans les classes amène les enseignants à questionner leurs propres postures, à identifier et à mettre en œuvre des gestes professionnels susceptibles de développer chez l’élève des démarches adaptées à la lecture/écriture de textes informatifs. [less ▲]

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See detailGlobal, diffuse and direct irradiances modelling over northwestern Europe using regional climate model MAR : validation and construction of a 30-year climatology
Beaumet, Julien ULg; Doutreloup, Sébastien ULg; Fettweis, Xavier ULg et al

Poster (2015, April 17)

Incoming solar global irradiances are modelled using MAR regional climate model forced by ERA-Interim reanalysis. Global irradiances are decomposed into direct and diffuse using sigmoid model from Ruiz ... [more ▼]

Incoming solar global irradiances are modelled using MAR regional climate model forced by ERA-Interim reanalysis. Global irradiances are decomposed into direct and diffuse using sigmoid model from Ruiz-Arias et al. (2010). Results are validated using data from the European Solar Radiation Atlas for Uccle and Braunschweig weather stations. A 30-year climatology has been built and trends and variability have been analyzed. [less ▲]

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See detailGenetic correlations between methane production and milk fatty acid contents of Walloon Holstein cattle throughout the lactation
Vanrobays, Marie-Laure ULg; Vandenplas, Jérémie ULg; Bastin, Catherine ULg et al

Poster (2015, April 16)

Methane (CH4) from ruminal fermentation is the major greenhouse gas produced by dairy cattle which contributes largely to climate change. Production of CH4 also represents losses of gross energy intake ... [more ▼]

Methane (CH4) from ruminal fermentation is the major greenhouse gas produced by dairy cattle which contributes largely to climate change. Production of CH4 also represents losses of gross energy intake. Therefore, there is a growing interest in mitigating these emissions. Acetate and butyrate have common bio-chemical pathways with CH4. Because some milk fatty acids (FA) arise from acetate and butyrate, milk FA are often considered as potential predictors of CH4. However, relationships between these traits remain unclear. Moreover, the evolution of the phenotypic and genetic correlations of CH4 and milk FA across days in milk (DIM) has not been evaluated. The main goal of this study was to estimate genetic correlations between CH4 and milk FA contents throughout the lactation. Calibration equations predicting daily CH4 production (g/d) and milk FA contents (g/100 dL of milk) from milk mid-infrared (MIR) spectra were applied on MIR spectra related to Walloon milk recording. Data included 243,260 test-day records (between 5 and 365 DIM) from 33,850 first-parity Holstein cows collected in 630 herds. Pedigree included 109,975 animals. Bivariate (i.e., CH4 production and one of the FA traits) random regression test-day models were used to estimate genetic parameters of CH4 production and 7 groups of FA contents in milk. Saturated (SFA), short-chain (SCFA), and medium-chain FA (MCFA) showed positive averaged daily genetic correlations with CH4 production (from 0.25 to 0.29). Throughout the lactation, genetic correlations between SCFA and CH4 were low in the beginning of the lactation (0.11 at 5 DIM) and higher at the end of the lactation (0.54 at 365 DIM). Regarding SFA and MCFA, genetic correlations between these groups of FA and CH4 were more stable during the lactation with a slight increase (from 0.23 to 0.31 for SFA and from 0.23 to 0.29 for MCFA, at 5 and 365 DIM respectively). Furthermore, averaged daily genetic correlations between CH4 production and monounsaturated (MUFA), polyunsaturated (PUFA), unsaturated (UFA), and long-chain FA (LCFA) were low (from 0.00 to 0.15). However, these genetic correlations varied across DIM. Genetic correlations between CH4 and MUFA, PUFA, UFA, and LCFA were negative in early lactation (from -0.24 to -0.34 at 5 DIM) and increased afterward to become positive from 15 weeks till the end of the lactation (from 0.14 to 0.25 at 365 DIM). Finally, these results indicate that genetic and, therefore, phenotypic correlations between CH4 production and milk FA vary following lactation stage of the cow, a fact still often ignored when trying to predict CH4 production from FA composition. [less ▲]

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See detailSnow cover evolution during the last fifty years in the Hautes Fagnes (Belgium) using the regional climate MAR model
Wyard, Coraline ULg; Fettweis, Xavier ULg; Erpicum, Michel ULg

Conference (2015, April 16)

The MAR model is a regional climate model originally developped for the polar regions to study the surface mass balance. In this study, the MAR model has been adapted to Belgium in order to study the snow ... [more ▼]

The MAR model is a regional climate model originally developped for the polar regions to study the surface mass balance. In this study, the MAR model has been adapted to Belgium in order to study the snow cover evolution of the Hautes Fagnes (south-east of Belgium), a region covered by snow one to two months per year. As validation, we have sucessfully compared MAR based daily snow heights with snowcam-based observations. Then, the model has been forced by ERA-Interim since 1958 to study the snow cover evolution during the last fifty years at the summit of Belgium. The results show non-significant trend. [less ▲]

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See detailCorrelation between levels of β-hydroxybutyrate and fatty acids in blood and milk and its impact on ketosis diagnosis in dairy cows
Lessire, Françoise ULg; Knapp, Emilie ULg; Dotreppe, Olivier et al

Poster (2015, April 16)

SKC at herd level is difficult to diagnose. Poor production and reproduction performances are usually observed as an increased incidence of periparturient diseases in the herd (Suthar et al., 2013 ... [more ▼]

SKC at herd level is difficult to diagnose. Poor production and reproduction performances are usually observed as an increased incidence of periparturient diseases in the herd (Suthar et al., 2013). Diagnosis methods include determination of beta-hydroxybutyrate (BHB) and increased non-esterified fatty acids (NEFA) resulting from body fat mobilization. BHB and NEFA could be dosed in blood of animals in late gestation and in early lactation. Post calving, cows presenting BHB over 1. 2-1.4 mmol/L are considered SCK-cows while those presenting NEFA over 0.6 mg/L are labelled fat mobilising cows. Development of non-invasive diagnosis techniques could be interesting to sample animals at a larger scale with lesser stress. The aim of this study was to verify whether blood and milk BHB values were correlated and whether diagnostic methods by milk analysis could be developed. Seventy -five cows out of 8 selected Walloon dairy herds were followed up monthly from calving to pregnancy diagnosis regarding production and reproduction. At each visit (V), BHB and NEFA levels were determined in milk and blood. A maximum of 5 V was made. BHB was determined in blood using a cow-side test and in milk by a colorimetric test . Blood NEFA and milk fatty acids were determined by gas chromatography (GC). Statistical analysis was performed by SAS 9.1. BHB levels in blood and milk were highly correlated (r= 0.86), indicating the possibility of diagnosis of SCK by milk sampling. The earliest the samples have been taken, the better the correlation is (r=0.95 V1; r = 0.91 V2). Comparison of BHB with NEFA demonstrated a better correlation with milk BHB than with blood BHB (respectively 0.51 and 0.53 in milk vs 0.41 and 0.48 in blood for the V1 and V2 respectively). After the 2d V, the correlation dropped to 0.38 (V3) and -0.14 (V4).To conclude, dosage of milk BHB could be a good indicator for ketosis diagnosis taking into account that correlation with blood BHB and with NEFA is time-related. [less ▲]

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See detailEvaluation of soil structural changes through macroscopic and microscopic measurement
Parvin, Nargish ULg; Degré, Aurore ULg; Chelin, Marie ULg et al

Poster (2015, April 16)

The heterogeneity of soil structure and pore size distribution are highly influenced by external factors like tillage systems and other agricultural management practices. However, changes in soil ... [more ▼]

The heterogeneity of soil structure and pore size distribution are highly influenced by external factors like tillage systems and other agricultural management practices. However, changes in soil hydrodynamic behavior are not fully understood and are still under research. Also, researchers have explained the impact of tillage practices on soil hydraulic properties related to pore size distribution, connectivity and orientation are involved but the characterization of these modifications and consequences remains a challenge. Furthermore, the relation between macroscopic measurements and microscopic investigation of the soil structure remains scarce. Recently, X-ray tomography (X- μCT) has been used in order to characterize changes in soil pore size distribution in various contexts and the method is able to link microtomography information to hydrodynamic measurement. In our study, X-μCT has been used in order to characterize changes in soil pore system. Since, tomography does not count most of the micropores, Richards’ pressure plate and evaporation method was also combined to get complete range of pore size distribution. We found good match between evaporation data with X-μCT at the macropore scale and evaporation data with pressure plate method at micropore scale. X-μCT data refines retention and hydraulic curves near saturation where Richards’ data alone can lead to numerous sets of fitted parameters. On the otherhand, evaporation data (Hyprop apparatus ©) provide comparable datasets with X-μCT. Combining micro and macroscopic measurements allows us to validate X-μCT information, which is otherwise not so obvious. [less ▲]

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See detailThe seamod.ro operational stochasting forecasting system of the Black Sea
Vandenbulcke, Luc ULg; Barth, Alexander ULg; Capet, Arthur et al

Poster (2015, April 15)

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See detailVariogram-based inversion of time-lapse electrical resistivity data: development and application to a thermal tracing experiment
Hermans, Thomas ULg; Nguyen, Frédéric ULg

Poster (2015, April 15)

Electrical resistivity tomography (ERT) has become a popular imaging methodology in a broad range of applications given its large sensitivity to subsurface parameters and its relative simplicity to ... [more ▼]

Electrical resistivity tomography (ERT) has become a popular imaging methodology in a broad range of applications given its large sensitivity to subsurface parameters and its relative simplicity to implement. More particularly, time-lapse ERT is now increasingly used for monitoring purposes in many contexts such as water content, permafrost, landslide, seawater intrusion, solute transport or heat transport experiments. Specific inversion schemes have been developed for time-lapse data sets. However, in contrast with static inversions for which many techniques including geostatistical, minimum support or structural inversion are commonly applied, most of the methodologies for time-lapse inversion still rely on non-physically based spatial and/or temporal smoothing of the parameters or parameter changes. In this work, we propose a time-lapse ERT inversion scheme based on the difference inversion scheme. We replace the standard smoothness-constraint regularization operator by the parameter change covariance matrix. This operator takes into account the correlation between changes in resistivity at different locations through a variogram computed using independent data (e.g., electromagnetic logs). It may vary for subsequent time-steps if the correlation length is time-dependent. The methodology is first validated and compared to the standard smoothness-constraint inversion using a synthetic benchmark simulating the injection of a conductive tracer into a homogeneous aquifer inducing changes in resistivity values of known correlation length. We analyze the influence of the assumed correlation length on inversion results. Globally, the method yields better results than the traditional smoothness constraint inversion. Even if a wrong correlation length is assumed, the method performs as well as the smoothness constraint since the regularization operator balances the weight given to the model constraint functional in the objective function. Then the methodology is successfully applied to a heat injection and pumping experiment in an alluvial aquifer. The comparison with direct measurements in boreholes (temperature loggers and distributed temperature sensing optic fibres) shows that ERT-derived temperatures and breakthrough curves image reliably the heat plume through time (increasing part of the curve, maximum and tail are correctly retrieved) and space (lateral variations of temperature are observed) with less spatial smoothing than standard methods. The development of new regularization operators for time-lapse inversion of ERT data is necessary given the broad range of applications where ERT monitoring is used. In many studies, independent data are available to derive geostatistical parameters that can be subsequently used to regularize geophysical inversions. In the future, the integration of spatio-temporal variograms into existing 4D inversion schemes should further improve ERT time-lapse imaging. [less ▲]

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See detailExperimental design to monitor the influence of crop residue management on the dynamics of soil water content
Chelin, Marie ULg; Parvin, Nargish ULg; Hiel, Marie-Pierre ULg et al

Poster (2015, April 15)

Choices related to crop residue management affecting soil structure determine spatio-temporal dynamics of water content and eventually crop yields. In this contribution, we discuss the experimental design ... [more ▼]

Choices related to crop residue management affecting soil structure determine spatio-temporal dynamics of water content and eventually crop yields. In this contribution, we discuss the experimental design we adopted to study the influence of three different agricultural management strategies (tillage and residue management) on the soil water dynamics under maize in a Cutanic Siltic Luvisol in Gembloux, Belgium. In order to limit soil disturbance, we opted for the use electrical resistivity tomography (ERT) and we use the bulk electrical conductivity as a proxy for soil moisture content. ERT is collected every week on a surface of two square meters corresponding to three rows of seven maize plants through surface stainless steel electrodes. Four additional sticks with stainless steel electrodes will be vertically inserted into the soil up to 1.20 m to get more detailed information near to the central maize row. In each of the monitoring plots, two time-domain reflectometry (TDR) probes will be installed for data validation. In order to calibrate the relationship between electrical resistivity and soil water content under highly variable field conditions (changes in soil structure, variable weather conditions, plant growth, fertilization), a trench will be dug, in which a set of four electrodes, one TDR probe and one temperature sensor will be placed at four different depths. In addition, two suction cups will be installed in each of the plots to quantify changes in ion composition and electrical conductivity of the soil solution at two different depths. Within the framework of the multidisciplinary research platform AgricultureIsLife, regular assessment of pore structure and crop developement will be conducted using X-ray images. Combining this wide range of data, we will be able to investigate and quantify the effect of simultaneously changing pore water conductivity, soil porosity, soil temperature and soil moisture on the effectiveness of time-lapse ER measurements as a proxy for soil moisture changes. [less ▲]

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See detailRegularized focusing inversion of time-lapse electrical resistivity data: an approach to parametrize the minimum gradient support functional
Nguyen, Frédéric ULg; Hermans, Thomas ULg

Poster (2015, April 15)

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, geothermal heat exchange, site remediation or ... [more ▼]

Inversion of time-lapse resistivity data allows obtaining ‘snapshots’ of changes occurring in monitored systems for applications such as aquifer storage, geothermal heat exchange, site remediation or tracer tests. Based on these snapshots, one can infer qualitative information on the location and morphology of changes occurring in the subsurface but also quantitative estimates on the degree of changes in certain property such as temperature or total dissolved solid content. Analysis of these changes can provide direct insight into flow and transport and associated processes and controlling parameters. However, the reliability of the analysis is dependent on survey geometry, measurement schemes, data error, and regularization. Survey design parameters may be optimized prior to the monitoring survey. Regularization, on the other hand, may be chosen depending on available information collected during the monitoring. Common approaches consider smoothing model changes both in space and time but it is often needed to obtain a sharp temporal anomaly, for example in fractured aquifers. We here propose to use the alternative regularization approach based on minimum gradient support (MGS) (Zhdanov, 2002) for time-lapse surveys which will focus the changes in tomograms snapshots. MGS will limit the occurrences of changes in electrical resistivity but will also restrict the variations of these changes inside the different zones. A common difficulty encountered by practitioners in this type of regularization is the choice of an additional parameter, the so-called , required to define the MGS functional. To the best of our knowledge, there is no commonly accepted or standard methodology to optimize the MGS parameter . The inversion algorithm used in this study is CRTomo (Kemna 2000). It uses a Gauss-Newton scheme to iteratively minimize an objective function which consists of a data misfit functional and a model constraint functional. A univariate line search is performed at each Gauss-Newton iteration step to find the optimum value of the regularization parameter  which minimizes the data misfit as a function of  while the data misfit is above the desired value and yields the desired target misfit (root-mean square value of error-weighted data misfit equal to 1) at the last iteration for a maximum value of . We propose here to optimize the  of the MGS functional by considering a univariate line search at the first iteration to find the  that minimizes the data misfit. The parameter is then kept constant during the Gauss-Newton iterative scheme. In this contribution, we validate our approach on a numerical benchmark and apply it successfully on a case study in the context of salt tracers in fractured aquifers. Zhdanov M.S. 2002. Geophysical Inverse Theory and Regularization Problems. Elsevier, Amsterdam, 628 p. Kemna A. 2000. Tomographic Inversion of Complex Resistivity - Theory and Application. PhD Thesis, Ruhr University Bochum. [less ▲]

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See detailFirst evidence of Neandertal cannibalism in Northern Europe: the case of the “Troisieme Caverne” of Goyet (Belgium)
Rougier, H.; Crevecoeur, I.; Beauval, C. et al

Conference (2015, April 15)

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See detailFuture projections of the Greenland ice sheet mass balance using the regional climate MAR model coupled with the GRISLI ice sheet model
Wyard, Coraline ULg; Fettweis, Xavier ULg; Ritz, Catherine

Poster (2015, April 14)

During the two last decades, the Greenland ice sheet (GrIS) contribution to the global mean sea level rise has significantly increased. But, difficulties remain to assess GrIS future contribution because ... [more ▼]

During the two last decades, the Greenland ice sheet (GrIS) contribution to the global mean sea level rise has significantly increased. But, difficulties remain to assess GrIS future contribution because of large uncertainties linked to the feedback between the surface mass balance (SMB) and GrIS topography changes. The regional climate MAR model has been coupled with the GRISLI ice sheet model, in order to account of this feedback in the future projections. The aim of this study is to assess the pertinence of the MAR-GRISLI coupling which requires long computation time. In order to identify GRISLI sensitivity to MAR forcing, GRISLI has been forced with various non-coupled (i.e. using a fixed topography), coupled and modified non-coupled MAR outputs. To adapt the non-coupled MAR outputs to the GRISLI topography changes, we use an interpolation technique based on SMB vs elevation vertical gradient. These experiences evaluate the performances/limits of this interpolation technique used to avoid a RCM-ice sheet model coupling. [less ▲]

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See detailUse of NIR Hyperspectral Imaging and dichotomist classification tree based on SVM in order to discriminate roots and crop residues of winter wheat
Eylenbosch, Damien ULg; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

Poster (2015, April 14)

NIR Hyperspectral Imaging coupled with SVM chemometric tool is proposed as an alternative method to the tedious and time-consuming hand sorting step needed before root quantification using the soil coring ... [more ▼]

NIR Hyperspectral Imaging coupled with SVM chemometric tool is proposed as an alternative method to the tedious and time-consuming hand sorting step needed before root quantification using the soil coring method. This method was applied to quantify roots under a winter wheat crop. [less ▲]

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See detailLIPOSOME CONTAINING ESTETROL FOR THE TREATMENT OF ISCHEMIA DISEASES IN PREMATURE BABIES
Palazzo, Claudio ULg; Karim, Reatul ULg; Mawet, Mawet et al

Poster (2015, April 14)

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See detailOptical Study of a Spectrum Splitting Solar Concentrator based on a Combination of a Diffraction Grating and a Fresnel Lens
Michel, Céline ULg; Loicq, Jerôme ULg; Thibert, Tanguy ULg et al

Poster (2015, April 14)

This poster presents recent improvements of our new solar concentrator design for space application. The concentrator is based on a combination of a diffraction grating (blazed or lamellar) coupled with a ... [more ▼]

This poster presents recent improvements of our new solar concentrator design for space application. The concentrator is based on a combination of a diffraction grating (blazed or lamellar) coupled with a Fresnel lens. Thanks to this diffractive/refractive combination, this optical element splits spatially and spectrally the light and focus approximately respectively visible light and IR light onto electrically independent specific cells. It avoid the use of MJs cells and then also their limitations like current matching and lattice matching conditions, leading theoretically to a more tolerant system. The concept is reminded, with recent optimizations, ideal and more realistic results, and the description of an experimental realization highlighting the feasibility of the concept, and the closeness of theoretical and experimental results. [less ▲]

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See detailUse of NIR-HIS and dichotomist classification tree based on SVMDA models in order to discriminate roots and crop residues of winter wheat
Eylenbosch, Damien ULg; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

in EARSeL 2015: 9th EARSeL SIG Imaging Spectroscopy workshop, Luxembourg 14-16 April 2015 (2015, April 14)

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