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See detailContact model between superelements in dynamic multibody systems
Virlez, Geoffrey ULg; Bruls, Olivier ULg; Sonneville, Valentin ULg et al

in Proceedings of ASME2013 International Design Engineering Technical Conference & Computers and Information in Engineering Conference IDETC/CIE 2013 (2013, August)

In this paper, a new contact formulation defined between flexible bodies modeled as superelements is investigated. Unlike rigid contact models, this approach enables to study the deformation and vibration ... [more ▼]

In this paper, a new contact formulation defined between flexible bodies modeled as superelements is investigated. Unlike rigid contact models, this approach enables to study the deformation and vibration phenomena induced by hard contacts. Compared with full-scale finite element models of flexible bodies, the proposed method is computationally more efficient, especially in case of a large number of bodies and contact conditions. The compliance of each body is described using a reduced-order elastic model which is defined in a corotational frame that follows the gross motion of the body. The basis used to reduce the initial finite element model relies on the Craig-Bampton method which uses both static boundary modes and internal vibration modes. The formulation of the contact condition couples all degrees of freedom of the reduced model in a nonlinear way. The relevance of the approach is demonstrated by simulation results first on a simple example, and then on a gear pair model. [less ▲]

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See detailContact resistance problems applying ERT on low bulk density forested stony soils Is there a solution?
Deraedt, Deborah ULg; Touzé, Camille; Robert, Tanguy et al

in Geophysical Research Abstracts (2015), 17

Electrical resistivity tomography (ERT) has often been put forward as a promising tool to quantify soil water and solute fluxes in a non-invasive way. In our experiment, we wanted to determine ... [more ▼]

Electrical resistivity tomography (ERT) has often been put forward as a promising tool to quantify soil water and solute fluxes in a non-invasive way. In our experiment, we wanted to determine preferential flow processes along a forested hillslope using a saline tracer with ERT. The experiment was conducted in the Houille watershed, subcatchment of the Meuse located in the North of Belgian Ardennes (50˚1’52.6”N, 4˚53’22.5”E). The climate is continental but the soil under spruce (Picea abies (L.) Karst.) and Douglas fire stand (Pseudotsuga menziesii (Mirb.) Franco) remains quite dry (19% WVC in average) during the whole year. The soil is Cambisol and the parent rock is Devonian schist covered with variable thickness of silty loam soil. The soil density ranges from 1.13 to 1.87 g/cm3 on average. The stone content varies from 20 to 89% and the soil depth fluctuates between 70 and 130 cm. The ERT tests took place on June 1st 2012, April 1st, 2nd and 3rd 2014 and May 12th 2014. We used the Terrameter LS 12 channels (ABEM, Sweden) in 2012 test and the DAS-1 (Multi-Phase Technologies, United States) in 2014. Different electrode configurations and arrays were adopted for different dates (transect and grid arrays and Wenner – Schlumberger, Wenner alpha and dipole-dipole configurations). During all tests, we systematically faced technical problems, mainly related to bad electrode contact. The recorded data show values of contact resistance above 14873 Ω (our target value would be below 3000 Ω). Subsequently, we tried to improve the contact by predrilling the soil and pouring water in the electrode holes. The contact resistance improved to 14040 Ω as minimum. The same procedure with liquid mud was then tested to prevent quick percolation of the water from the electrode location. As a result, the lower contact resistance dropped to 11745 Ω. Finally, we applied about 25 litre of saline solution (CaCl2, 0.75g/L) homogeneously on the electrode grid. The minimum value of contact resistance reduced to 5222 Ω. This improved the contact resistance substantially, but complicates the execution of a pulse tracer experiment. To date we did not find any better solution to this problem and we keep searching a way to improve the contact resistance in stony forested soils with very low bulk density. We would like to exchange on these questions with EGU attendees in order to improve the experimental design or point out a new research path for these specific conditions. This could lead to enhance the use of ERT in soils with low density and high stone content. [less ▲]

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See detailContact-killing polyelectrolyte microcapsules based on chitosan derivatives
Cui, Di; Szarpak, Anna; Pignot-Paintrand, Isabelle et al

in Advanced Functional Materials (2010), 20(19), 3303-3312

A new type of multilayer capsules is designed for use as antibacterial vehicles by taking advantage of the properties of natural polysaccharides. These capsules, prepared by layer-by-layer assembly of ... [more ▼]

A new type of multilayer capsules is designed for use as antibacterial vehicles by taking advantage of the properties of natural polysaccharides. These capsules, prepared by layer-by-layer assembly of hyaluronic acid (HA; see graphic) and quaternized chitosan (QCHI) derivatives onto sacrificial colloidal particles, show distinct killing activities depending on the nature of the polysaccharide on the surface. [less ▲]

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See detailA contactin-receptor-like protein tyrosine phosphatase beta complex mediates adhesive communication between astroglial cells and gonadotropin-releasing hormone neurons
Parent, Anne-Simone ULg; Mungenast, Alison; Lomniczi, Alejandro et al

in Journal of Neuroendocrinology (2007), 19

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See detailLes contacts du Silurien et de la porphyrite à Quenast
Malaise, Constantin ULg

in Bulletin de la Société Belge de Géologie, de Paléontologie et d'Hydrologie (1910), 24

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See detailContagion inside the Credit Default Swaps markets in the light of 2008 crisis
Sougné, Danielle ULg; Mattar, Jamal ULg

in Journal of Business and Economics (2012)

Detailed reference viewed: 95 (11 ULg)
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See detailThe containment strategy of extreme right wing parties : a failure ?
Italiano, Patrick ULg; Pieters, Jérôme ULg; Kovincic, Petar ULg et al

Conference (2012, November)

When confronted to data from European social Survey, there seems to be no link between the acceptance of immigration by public opinion in a sample of western Europe countries and the presence of extreme ... [more ▼]

When confronted to data from European social Survey, there seems to be no link between the acceptance of immigration by public opinion in a sample of western Europe countries and the presence of extreme right parties in those countries. This contradicts various political analysis and some other data. The paper states this possible discrepancy and tries to find explanations [less ▲]

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See detailUn contaminant envahissant : nouveau regard sur le thigmotropisme fongique.
Quatresooz, Pascale; Blaise, Géraldine; Henry, Frédérique ULg et al

in Dermatologie Actualité (2008), 107

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See detailContaminants in blood of infants on prolonged intravenous therapy.
Battisti, Oreste ULg; François, Baudouin; Leyssens, Luc et al

in Lancet (1986), 1

Detailed reference viewed: 15 (5 ULg)
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See detailContamination and detoxication processes in marine mammals from European coasts
Das, Krishna ULg

Doctoral thesis (2002)

The aim of the present work was to determine the relationships between trace metal levels and different factors such as species, geographic origin, diet, age and general body condition of marine mammals ... [more ▼]

The aim of the present work was to determine the relationships between trace metal levels and different factors such as species, geographic origin, diet, age and general body condition of marine mammals from European seas [less ▲]

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See detailLa contamination de l'eau et des aliments par les virus pathogènes pour l'homme
Scipioni, Alexandra ULg; Daube, Georges ULg; Thiry, Etienne ULg

in Annales de Médecine Vétérinaire (2000), 144

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See detailLa contamination de la filière laitière par les mycotoxines : un risque pour la santé publique en Afrique subsaharienne
Ruppol, Patrick; Delfosse, Philippe; Hornick, Jean-Luc ULg

in Annales de Médecine Vétérinaire (2004), 148(3), 141-146

Mycotoxins are toxic metabolites produced by some fungi developing on several agricultural commodities. In sub-Saharan Africa, the recent changes in feeding practices increase the risk of contamination ... [more ▼]

Mycotoxins are toxic metabolites produced by some fungi developing on several agricultural commodities. In sub-Saharan Africa, the recent changes in feeding practices increase the risk of contamination for dairy cattle and subsequently the passage of mycotoxins in the food chain. Aflatoxins are the major mycotoxins known to enter into milk and many milk-based foods. The naturally occurring aflatoxin B is (bio-) transformed by mammals into various metabolites including the aflatoxin M excreted in milk. Food processing aiming at long term food storage (sterilization, pasteurisation, freeze-drying.) do not alter, or only slightly, the toxicity of aflatoxins. The best option to reduce milk contamination is to prevent the introduction of contaminated feed in the dairy cattle diet. Very little information is available on the flux and modifications of mycotoxins (synthesis, alteration, dilution or concentration) during the processing of milk and milk-based products. Therefore this field of research is given a high priority by the scientific community. [less ▲]

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See detailContamination des sols par les activités minières à Lubumbashi (RDC). Incidences en matière de diagnostic et de choix de solutions de gestion.
Mpundu Mubemba, Michel; Ngoy Shutcha, Mylor; Faucon, Michel-Pierre et al

in Schwartz, Dominique (Ed.) Actes des 10emes JES (2009, May)

Detailed reference viewed: 38 (4 ULg)