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See detailMultiple mode analysis of the self-excited vibrations of rotary drilling systems
Germay, Christophe; Denoël, Vincent ULg; Detournay, Emmanuel

in Journal of Sound & Vibration (2009), 325(1-2), 362-381

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See detailSurface functionalization of germanium ATR devices for use in FTIR-biosensors
Devouge, S.; Conti, J.; Goldsztein, A. et al

in Journal of Colloid & Interface Science (2009), 332(2), 408-415

Biosensors based on intrinsic detection methods have attracted growing interest. The use of Fourier transform infra-red (FTIR) spectroscopy with the attenuated internal total reflection (ATR) mode, in the ... [more ▼]

Biosensors based on intrinsic detection methods have attracted growing interest. The use of Fourier transform infra-red (FTIR) spectroscopy with the attenuated internal total reflection (ATR) mode, in the biodetection context, requires appropriate surface functionalization of the ATR optical element. Here, we report the direct grafting of a thin organic layer (about 20 angstrom depth) on the surface of a germanium crystal. This covering, constructed with novel amphiphilic molecules 2b (namely, 2,5,8,11,14,17,20-heptaoxadocosan-22-yl-3-(triethoxysilyl) propylcarbamate), is stable for several hours under phosphate buffered saline (PBS) flux and features protein-repulsive properties. Photografting of molecule 5 (namely, O-succinimidyl 4-(p-azidophenyl)butanoate) affords the activated ATR element, ready for the covalent fixation of receptors, penicillin recognizing proteins BlaR-CrD for instance. The different steps of the previous construction have been monitored by water contact angle (theta(w)) measurements, spectroscopic ellipsometry (covering depth), X-ray photoelectron spectroscopy (XPS) by using a fluorinated tag for the control of surface reactivity, and FTIR-ATR spectroscopy for the structural analysis of grafted molecules. Indeed, contrarily to silicon device, germanium device offers a broad spectral window (1000-4000 cm(-1)) and thus amide I and II absorption bands can be recorded. This work lays the foundations for the construction of novel FTIR biosensors. (c) 2008 Elsevier Inc. All rights reserved. [less ▲]

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See detailA qui l'assureur doit-il payer l'indemnité d'assurance à la suite du vol d'un véhicule en leasing?
Paris, Catherine ULg

in Revue Générale des Assurances et des Responsabilités (2009)

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See detailHMTY-KM (Black Copper) and the egyptian bronzes collection of the Musee du Louvre
Mathis, François ULg; Delange, Elisabeth; Robcis, Dominique et al

in Journal of Cultural Heritage (2009), 10

At the instigation of the Musée du Louvre’s Department of Egyptian Antiquities, an intensive programme to study black bronze has been carried out at the Centre de Recherche et de Restauration des Muse´es ... [more ▼]

At the instigation of the Musée du Louvre’s Department of Egyptian Antiquities, an intensive programme to study black bronze has been carried out at the Centre de Recherche et de Restauration des Muse´es de France. Systematic research has been undertaken on the museum’s collection to identify objects that might have an intentional black patina. The same experimental protocol has been applied to all the objects, alllowing this study to be one of the most important coherent investigation on this type of bronze decoration. It involves the use of non-invasive analytical methods in order to obtain the maximum amount of information possible about the chemical nature and structure of the surface layer. The protocol makes it possible to compare objects and to propose an interpretation of how this decorative technique evolved during the Egyptian period. Based on previous stylistic investigations (by J. Cooney, 1966) and personal observation, sixteen objects dating from the Middle Kingdom to the Late Period were selected. Thanks to elemental analyses, twelve of them were identified as being intentionally patinated. Only ten of these could be described as hmty-km, because the base patinated alloy contains small amounts of gold and/or silver and the black patina is made up mainly of cuprous oxide Cu2O (cuprite). Among the four other objects, one patina is very close to the black bronze patina, but contains neither gold nor silver. Three other pieces have an unusual patina. A lack of other comparable examples makes it very difficult to determine whether the patinas are of ancient origin. [less ▲]

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See detailTowards the differentiation of non-treated and treated corundum minerals by ion-beam-induced luminescence and other complementary techniques
Calvo Del Castillo, Helena ULg; Dupuis, Thomas ULg; Mathis, François ULg et al

in Analytical and Bioanalytical Chemistry (2009), 394

Abstract  Differentiation of treated and non-treated gemstones is a chief concern for major jewellery import companies. Low-quality corundum specimens coming from Asia appear to be often treated with heat ... [more ▼]

Abstract  Differentiation of treated and non-treated gemstones is a chief concern for major jewellery import companies. Low-quality corundum specimens coming from Asia appear to be often treated with heat, BeO or flux in order to enhance their properties as precious minerals. A set of corundum samples, rubies and sapphires from different origins, both treated and non-treated has been analysed at the Centre Européen d’Archéométrie, with ion-beam-induced luminescence (IBIL) and other complementary techniques such as Raman, proton-induced X-ray emission (PIXE), and proton-induced gamma-ray emission (PIGE). IBIL, also known as ionoluminescence, has been used before to detect impurities or defects inside synthetic materials and natural minerals; its use for the discrimination of gemstone simulants or synthetic analogues has been elsewhere discussed (Cavenago-Bignami Moneta, Gemología, Tomo I Piedras preciosas, perlas, corales, marfil. Ediciones Omega, Barcelona, 1991). PIXE has been frequently applied in the archaeometric field for material characterisation and provenance studies of minerals (Hughes, Ruby & sapphire. RWH Publishing, Fallbrook, 1997; Calvo del Castillo et al., Anal Bioanal Chem 387:869–878, 2007; Calligaro et al., NIM-B 189:320–327, 2002) and PIGE complements the elemental analysis by detecting light elements in these materials such as—and lighter than—sodium that cannot be identified with the PIXE technique (Sanchez et al., NIM-B 130:682–686, 1997; Emmett et al., Gems Gemology 39:84–135, 2003). The micro-Raman technique has also been used complementarily to ion beam analysis techniques for mineral characterisation (Novak et al., Appl Surf Sci 231–232:917–920, 2004). The aim of this study is to provide new means for systematic analysis of corundum gemstone-quality mineral, alternative to the traditional gemmologic methods; for this purpose, a Spanish jewellery import company supplied us with a number of natural corundum samples coming from different places (part of them treated as explained above). The PIXE elemental concentrations of the samples showed large quantities of calcium and lead in some cases that can be linked to treatment with fluxes or lead oxide. The plot of the chromium and iron concentration grouped the samples in various aggregates that corresponded to the different types of corundum analysed. Micro-Raman complemented the PIXE analysis corroborating the presence of lead oxides but the use of the PIGE technique was not successful for the detection of beryllium due to the low cross section of the nuclear reaction chosen for its identification. IBIL was capable of distinguishing between treated and non-treated samples of the same type based on the luminescent features of the materials. [less ▲]

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See detailDysregulation of anti-angiogenic agents (sFlt-1, PLGF, and sEndoglin) in preeclampsia--a step forward but not the definitive answer
Foidart, Jean-Michel ULg; Schaaps, Jean-Pierre ULg; Chantraine, Frédéric ULg et al

in Journal of Reproductive Immunology (2009), 82(2), 106-11

Preeclampsia (PE) is a pregnancy-specific syndrome characterized by hypertension, proteinuria and edema, which resolves on placental delivery. It is thought to be the consequence of impaired placentation ... [more ▼]

Preeclampsia (PE) is a pregnancy-specific syndrome characterized by hypertension, proteinuria and edema, which resolves on placental delivery. It is thought to be the consequence of impaired placentation due to inadequate trophoblastic invasion of the maternal spiral arteries. In PE the maternal plasma concentration of free vascular endothelial growth factor (VEGF) and placental growth factor (PlGF) is decreased whereas the concentration of soluble fms-like tyrosine kinase-1 (sFlt-1) and of soluble endoglin (sEng) is increased. These soluble receptors may bind VEGF, PLGF and TGFβ1 and TGFβ3 in the maternal circulation, causing endothelial dysfunction in many maternal tissues. Hence there is a view that the pathogenesis is more or less clarified. According to the vascular theory, poor placentation leads to poor uteroplacental perfusion and hypoxia, which stimulates sFlt-1 and sEng production causing the maternal syndrome. This assumption has been recently challenged. The role of hypoxia as the main stimulus for release of sFlt-1 has been questioned and the role of inflammatory mechanisms has been emphasized. According to this inflammatory theory, poor placentation may predispose more to placental oxidative stress than hypoxia and endothelial dysfunction may be part of a broader disorder of systemic inflammation. Finally, the recent demonstration of activating auto-antibodies to the angiotensin 1 receptor that experimentally play a major pathogenic role in PE further suggests a pleiotropism of aetiologies for this condition. The purpose of this review is to critically evaluate the recent hypotheses and their possible insights on early diagnosis, prevention and treatment. [less ▲]

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See detailCurvilinear mesh generation for CFD
Remacle, J.-F.; Geuzaine, Christophe ULg; Hillewaert, K.

in Proceedings of the 11th International Society of Grid Generation Conference (ISSG 2009) (2009)

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See detailVoglibose for prevention of type 2 diabetes mellitus.
Scheen, André ULg

in Lancet (2009), 373(9675), 1579-80

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See detailRosiglitazone: to be or not to be?
Scheen, André ULg

in Diabetologia (2009), 52(7), 1448-50

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See detailSozialkapital und der Neue Geist des Kapitalismus - Die Ideologie des vernetzten Menschen und neue Wege der Ausbeutung
Frère, Bruno ULg

in Neue Soziale Forschungsjournal Bewegungen (2009), 22/3

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See detailDoes implicit memory during anaesthesia persist in children?
Lopez, Ursula; Habre, w; Laurencon, M. et al

in British Journal of Anaesthesia (2009), 102(3), 37984

Background. Recent studies suggest that implicit memory (especially perceptual implicit memory) persists during adequate general anaesthesia in adults. Studies in children, however, have failed to ... [more ▼]

Background. Recent studies suggest that implicit memory (especially perceptual implicit memory) persists during adequate general anaesthesia in adults. Studies in children, however, have failed to demonstrate implicit memory during general anaesthesia, possibly because of differences in methodological design. We therefore designed a prospective study with the aim of evaluating implicit memory in children undergoing general anaesthesia, using a perceptual memory test based on the mere exposure effect, previously tested in a control group. Methods. Twelve infrequent neutral words were played 12 times in a random sequence via headphones to 36 children aged 8–12 yr during elective or emergency surgery. The children were not premedicated, and general anaesthesia was maintained with isoflurane. The word presentation started immediately after the surgical incision. Within 36 h after the stimulus presentation, the memory was assessed by using a forced-choice preference judgement task. Time constraint and word deterioration with a low-pass filter were used to prevent the subjects from utilizing intentional retrieval. The implicit memory score was obtained by calculating the proportion of target words preferred, which was compared with the chance level (0.5). Results. The percentage of correct responses given by the children was comparable with the chance level. The memory score was mean (SD) 0.48 (0.16) (95% CI 0.43–0.53). Conclusions. The use of a perceptual implicit memory test based on the mere exposure procedure in children failed to reveal any evidence of implicit memory under general anaesthesia. [less ▲]

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See detailFlushing operations with limited sediment availability
Dewals, Benjamin ULg; Brasseur, Nicolas; Erpicum, Sébastien ULg et al

in Proc. 33rd IAHR Congress: Water Engineering for a Sustainable Environment (2009)

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See detailCardiovascular Responses to Static Assessments of Trunk Muscles
Demoulin, Christophe ULg; Grosdent, Stéphanie ULg; Bury, Thierry ULg et al

in Journal of Musculoskeletal Pain (2009), 17(4), 378-389

Objectives: To investigate the cardiovascular responses to standard static assessments of strength and endurance of trunk extensor muscles. Methods: Trunk extensor performances of ten healthy men, 48.2±5 ... [more ▼]

Objectives: To investigate the cardiovascular responses to standard static assessments of strength and endurance of trunk extensor muscles. Methods: Trunk extensor performances of ten healthy men, 48.2±5.6 years, and 10 healthy women, 49±5.7 years, were assessed by means of a maximum static strength test [consisting in maximal voluntary contractions [MVC] performed with a specific dynamometer], and two static endurance tests [the Sorensen test, and a 50 percent MVC test]. Heart rate [HR], auscultatory systolic [SBP], and diastolic blood pressure [DBP] were recorded throughout the tests. Results: The MVCs induced significant increases of HR and SBP [mean peak values averaging 90 [female] to 95 [male] beats per minute and 133 [female] to 141 [male] mmHg]. The HR, SBP, and DBP values increased significantly across time throughout both endurance static tests. At the end of these tests, mean HR, SBP, and DBP reached 114 to 122 beats per minute, 172 to 185 mmHg, and 112 to 120 mmHg. Genders differed significantly with regard to holding times [longer in females], but a gender effect was only found on SBP [higher in males]. Heart rate and SBP increases were significantly higher in males than in female subjects. Conclusions: The strength test seems less demanding than expected, though our results need to be confirmed. Standard static endurance tests yield sizeable functional stress on the cardiovascular system. Our study emphasizes the need to exclude subjects with cardiac trouble from such efforts and suggests the relevance of monitoring cardiovascular parameters if tests are performed until exhaustion. [less ▲]

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See detailHeat transfer in soils
Hermansson, Ake; Charlier, Robert ULg; Collin, Frédéric ULg et al

in Dawson, Andrew (Ed.) Water in road structures - Movement, Drainage and effects (2009)

Temperature highly affects pavement performance. High and low temperatures not only affects the viscosity of asphalt concrete but also has an impact on the moisture flow within the pavements. At ... [more ▼]

Temperature highly affects pavement performance. High and low temperatures not only affects the viscosity of asphalt concrete but also has an impact on the moisture flow within the pavements. At temperatures below 0°C the freezing of pavements dramatically changes the permeability and frost action might occur forcing water to flow upwards to the freezing front resulting in the frost heave and other pavement distress. [less ▲]

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See detailIntegrated structure and control design for mechatronic systems with configuration-dependent dynamics
Da Silva, Maíra Martins; Bruls, Olivier ULg; Desmet, Wim et al

in Mechatronics (2009), 44(9), 10161025

This paper considers the optimal design of mechatronic systems with configuration-dependent dynamics. An optimal mechatronic design requires that, among the structural and control parameters, an optimal ... [more ▼]

This paper considers the optimal design of mechatronic systems with configuration-dependent dynamics. An optimal mechatronic design requires that, among the structural and control parameters, an optimal choice has to be made with respect to design specifications in the different domains. Two main challenges are treated in this paper: the non-convex nature of the optimization problem and the difficulty in modeling serial machines with flexible components and their embedded controllers. The optimization problem is treated using the direct design strategy which considers simultaneously structural and control parameters as variables and adopts non-convex optimization algorithms. Linear time-invariant and gain-scheduling PID controllers are addressed. This methodology is exploited for the multi-objective optimization of a pick-and-place assembly robot with a gripper carried by a variable-length flexible beam. The resulting design tradeoffs between system accuracy and control efforts demonstrate the advantage of an integrated design approach for mechatronic systems with configuration-dependent dynamics. 2009 Elsevier Ltd. All rights reserved. [less ▲]

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See detailLe droit administratif: droit dans le mur ?
Durviaux, Ann-Lawrence ULg

in Les murs (2009)

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See detailStability analysis of the evaporation of a binary liquid into an inert gas, considering solute/thermal and gravity/surface tension effects
Machrafi, Hatim ULg; Rednikov, A.; Colinet, P. et al

in Proceedings (CD) of the EUROTHERM Seminar Nr. 84 “Thermodynamics of phase changes”, Namur (Belgium), May 24-27, 2009 (2009)

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See detailPhase distribution measurements in metallic foam packing using X-ray radiography and micro-tomography
Calvo, Sébastien ULg; Beugre, Djomice Antoine ULg; Crine, Michel ULg et al

in Chemical Engineering & Processing (2009), 48(5), 1030-1039

Some structural and hydrodynamic properties of RCM-NCX-1116, a Ni-Cr metallic foam packing manufactured by Recemat International B.V (The Netherlands) are investigated using X-ray radiography and X-ray ... [more ▼]

Some structural and hydrodynamic properties of RCM-NCX-1116, a Ni-Cr metallic foam packing manufactured by Recemat International B.V (The Netherlands) are investigated using X-ray radiography and X-ray micro-tomography. Local values of porosity and pore diameters are measured on a foam sample 3D image obtained with a Skyscan-1172 high-resolution desk-top micro-CT system operated at 100 kV. Structural parameters computed on tomography images agree well with manufacturer data. Hydrodynamic tests are performed in a flat rectangular column packed with a sheet of metallic foam packing. Measurements are realized with a single-phase flow of liquid as well as with a counter-current flow of gas and liquid. Dynamic and static liquid holdup distributions and liquid radial spreading coefficient are measured on 2D radiographic images of the bed obtained with the high energy large scale ULG 420 kV scanner operated in the radiographic mode at 420 kV. Pressure drop measurements are successfully compared to experimental results reported in literature, as well as to the literature model predictions and to values computed using an in-house Lattice Boltzmann CFD simulation code. (C) 2009 Elsevier B.V. All rights reserved. [less ▲]

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See detailThe Worldwide Making of the Social Economy. Innovations and Changes
Defourny, Jacques ULg; Develtere, Patrick; Fonteneau, Bénédicte et al

Book published by Acco (2009)

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