References of "Scientific congresses and symposiums"
     in
Bookmark and Share    
See detailHow Daphnia maintain its homeostasis
Darchambeau, François ULg; Thys; Descy, Jean-Pierre et al

Conference (2003, July 16)

Detailed reference viewed: 47 (0 ULg)
Full Text
See detailRecent progress in ring-opening of ε-caprolactone and derivatives
Lecomte, Philippe ULg; Jérôme, Robert ULg

Conference (2003, July 02)

This oral communication was presented by Philippe Lecomte

Detailed reference viewed: 9 (2 ULg)
Full Text
See detail2-oxepane-1,5-dione: a precursor of a novel class of versatile semicrystalline biodegradable (co)-polyesters
Lecomte, Philippe ULg; Latere Dwan'Isa, Jean-Pierre; Dubois, Philippe et al

Poster (2003, July 01)

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4-cyclohexanedione and ring-opening polymerized by 1-phenyl-2-propanol / tin octoate with formation of a semicrystalline ... [more ▼]

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4-cyclohexanedione and ring-opening polymerized by 1-phenyl-2-propanol / tin octoate with formation of a semicrystalline polyester of high melting temperature (Tm: 147°C). A crystallographic study showed that the polyester is orthorombic in the P212121 space with two molecules extended along the c-axis as is the case for poly(ε-caprolactone) (PCL). Dibutyltin dimethoxide and 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) proved to be efficient initiators for the random copolymerization of ε-caprolactone (εCL) and OPD. Random distribution of the comonomer units was confirmed by DSC, 1H and 13C NMR analyses. A single Tm was observed, which varies regularly and monotonically with the OPD content as result of a cocrystallisation phenomenon. The single glass transition temperature (Tg) obeys the Fox equation. It is noteworthy that a copolymer containing 30 mol % OPD exhibits a Tm of 90°C. It is stable up to 140°C under nitrogen for one hour, such that processing by extrusion is quite possible. The OPD decomposition is maximum at 223°C for a heating rate of 10°C/min. The mechanism of thermal degradation was investigated and cleared up. The ketone increases the copolymer hydrophilicity and thus sensitivity to hydrolysis. The mechanical properties are quite reminiscent of PCL of comparable molecular weight. Quite interestingly, OPD imparts sensitivity to photo-cross-linking to this novel class of materials. [less ▲]

Detailed reference viewed: 109 (6 ULg)
Full Text
See detailDesign of an undervoltage load shedding scheme for the Hydro-Québec system
Lefebvre, Daniel; Moors, Cédric; Van Cutsem, Thierry ULg

(2003, July)

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set ... [more ▼]

This paper deals with the control logic of an undervoltage, closed-loop load shedding scheme aimed at protecting the Hydro-Quebec system against long-term voltage instability. This scheme relies on a set of "if-then" rules whose parameters are determined through combinatorial optimisation, relying on the system dynamic response over a set of scenarios. Preliminary results of the above optimisation technique are given, besides a brief description of the foreseen implementation. [less ▲]

Detailed reference viewed: 57 (2 ULg)
Peer Reviewed
See detailTowards tissue-selective KATP channel openers
Lebrun, P.; Antoine, M. H.; Dabrowski, M. et al

Poster (2003, July)

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailBrownian dynamics simulation in a turbulent channel flow
Terrapon, Vincent ULg; Dubief, Yves; Moin, Parviz et al

in Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference; No FEDSM2003-45680 (2003, July)

The dynamics of different bead-spring models is investigated in a turbulent channel flow. In particular, the FENE, the FENE-P and the FENE multichain models are compared. In the case of the FENE-P model ... [more ▼]

The dynamics of different bead-spring models is investigated in a turbulent channel flow. In particular, the FENE, the FENE-P and the FENE multichain models are compared. In the case of the FENE-P model, both the Brownian Dynamics and the constitutive equations are used. It is shown that the different models produce qualitatively similar results for the mean extension and the mean stresses. This qualitative behaviour is also reproduced for different extensibility parameters. It is also found that the action of polymers is confined in the near wall region where the polymers are mainly oriented in the streamwise direction. [less ▲]

Detailed reference viewed: 15 (1 ULg)
Full Text
Peer Reviewed
See detailContribution to the phylogeography of the garden dormouse (Eliomys quercinus)
Libois, Roland ULg; Michaux, J; Ramalhinho, Maria da Graça et al

in Macholan, Milos; Bryja, Josef; Zima, Jan (Eds.) European Mammalogy 2003 (2003, July)

Detailed reference viewed: 19 (1 ULg)
Full Text
Peer Reviewed
See detailLimit Cycle Prediction For Subsonic Aeroelastic Systems Using Nonlinear System Identification
Dimitriadis, Grigorios ULg; Vio, Gareth Arthur; Cooper, Jonathan Edward

in Ferman, M. A.; Petersson, B. A. T.; Rizzi, S. A. (Eds.) et al Proceedings of the VIII International Conference on Recent Advances in Structural Dynamics (2003, July)

The prediction of aeroelastic instabilities caused by nonlinear unsteady aerodynamic forces acting on aircraft has recently become an important area of research. Emphasis is placed on the capability to ... [more ▼]

The prediction of aeroelastic instabilities caused by nonlinear unsteady aerodynamic forces acting on aircraft has recently become an important area of research. Emphasis is placed on the capability to predict the occurrence of Limit Cycle Oscillations (LCOs) at both the design and prototype testing stages. In this paper, the prediction of LCOs is attempted for a simulated aeroelastic system subjected to nonlinear subsonic unsteady aerodynamic forces, using system identification. Response data from the simulated system are curve-fitted by means of a series of polynomial basis functions. This approach yields very accurate identified models of the actual system at individual flight conditions. These identified models are extrapolated to a global aeroelastic identified model. Using this model, the flight conditions at which LCOs occur is accurately predicted but the amplitude of the oscillations is underestimated. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of High Drag Reduction Regime in Polymer Solutions
Dubief, Yves; White, Christopher M.; Terrapon, Vincent ULg et al

in Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference; No FEDSM2003-45652 (2003, July)

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper ... [more ▼]

The simulation of drag reduced channel flows has to rely on consitituve models such as FENE-P. Their implementation is not straightforward to achieve convergence and stability of the solution. This paper discusses the problem of advection embedded in the FENE-P equation and the issue of the domain size. Finally we present results of simulations for High Drag Reduction regime, and show the subsequent modification of the vortical structures. [less ▲]

Detailed reference viewed: 19 (2 ULg)
Full Text
Peer Reviewed
See detailHybrid Acceleration using Real Vector Automata
Boigelot, Bernard ULg; Herbreteau, Frédéric; Jodogne, Sébastien ULg

in Lecture Notes in Computer Science (2003, July), 2725

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state ... [more ▼]

This paper addresses the problem of computing an exact and effective representation of the set of reachable configurations of a linear hybrid automaton. Our solution is based on accelerating the state-space exploration by computing symbolically the repeated effect of control cycles. The computed sets of configurations are represented by Real Vector Automata (RVA), the expressive power of which is beyond that of the first-order additive theory of reals and integers. This approach makes it possible to compute in finite time sets of configurations that cannot be expressed as finite unions of convex sets. The main technical contributions of the paper consist in a powerful sufficient criterion for checking whether a hybrid transformation (i.e., with both discrete and continuous features) can be accelerated, as well as an algorithm for applying such an accelerated transformation on RVA. Our results have been implemented and successfully applied to several case studies, including the well-known leaking gas burner, and a simple communication protocol with timers. [less ▲]

Detailed reference viewed: 16 (4 ULg)
Full Text
See detailA model reduction method for the control of rigid mechanisms
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proceedings of the ECCOMAS Conference on Advances in Computational Multibody Systems (2003, July)

This paper proposes a control strategy for flexible mechanisms. Our starting-point is a classical collocated PID control of the joint actuators designed for the equivalent rigid mechanism. An additional ... [more ▼]

This paper proposes a control strategy for flexible mechanisms. Our starting-point is a classical collocated PID control of the joint actuators designed for the equivalent rigid mechanism. An additional state feedback is implemented to control the flexible modes. On the basis of a few vibration measurements, it generates an additional command for the joint actuators. This non-collocated control scheme is designed according to the H procedure in order to have robust performances and stability with respect to configuration changes. In this paper, a new reduction methodology is presented to build a linear low-order and sufficiently accurate model of the mechanism with the PID feedback, which is suitable for the design of the H controller. First, a detailed Finite Element model of the mechanism is elaborated including the initial PID compensator. This set of nonlinear differential and algebraic equations is then linearized around a chosen reference configuration and a reduction technique is developed to extract a compact set of ordinaray differential equations. The retained degrees of freedom are the joint coordinates and a few modal coordinates representing the deformation of the whole mechanism. The kinematic description is thus decomposed into two parts, a rigid body motion described by the joint coordinates and a flexible motion for which shape functions have to be selected. For this selection, a modal analysis of the controlled mechanism is performed and the first few modes are kept, as in the Craig-Bampton or McNeal-Rubin reduction techniques. For robust performance specifications, the variations of the model with respect to the configuration changes should be estimated. Thus, the reduction procedure is realized for a few values of the joint coordinates, and the reduced models are compared. As the set of shape functions changes with the configuration, the physical meaning of the modal coordinates should be reinterpreted in each model, which is one difficulty of the approach. To illustrate the method, the case of a two-link flexible manipulator is presented. Simulation of the complete nonlinear Finite-Element model with the global control scheme is performed in order to assess the final performances of the closed-loop system. [less ▲]

Detailed reference viewed: 17 (2 ULg)
Full Text
Peer Reviewed
See detailOn-Line Voltage Security Assessment of the Hellenic Interconnected System
Vournas, Costas; Manos, George; Kabouris, John et al

(2003, June 26)

This paper describes the on-line Voltage Security Assessment environment developed within the framework of the EU-sponsored OMASES project, as well as its application to the Greek Interconnected Power ... [more ▼]

This paper describes the on-line Voltage Security Assessment environment developed within the framework of the EU-sponsored OMASES project, as well as its application to the Greek Interconnected Power System. The heart of all computations is a fast time-domain method. Security is analyzed with respect to power transfers in critical corridors or power consumption in load areas. Results take on the form of either precontingency secure operation limits, or post-contingency loadability limits, together with various diagnosis tips. Typical results obtained during the test phase of the project are reported. [less ▲]

Detailed reference viewed: 48 (1 ULg)
Full Text
Peer Reviewed
See detailReverse-logic control of load tap changers in emergency voltage conditions
Otomega, Bogdan; Sermanson, Vincent; Van Cutsem, Thierry ULg

(2003, June 26)

This papers deals with the emergency control of Load Tap Changers (LTCs) to face low transmission voltages or voltage instability situations. The proposed simple control logic consists in reverting the ... [more ▼]

This papers deals with the emergency control of Load Tap Changers (LTCs) to face low transmission voltages or voltage instability situations. The proposed simple control logic consists in reverting the tap movements once the voltage at a monitored transmission bus falls below some threshold. A deadband on this voltage allows the system to settle down in between the normal and reverse logic modes. In order to control a large number of LTCs, the latter are divided into clusters, each with its own monitored voltage. The paper also considers the control of two levels of LTCs in cascade, where proper coordination is required between the two levels. The proposed scheme has been tested on a detailed EHV-HV-MV planning model of the Western region of the French transmission system operated by RTE. Long-term time responses to major disturbances are shown to illustrate the performance of the proposed scheme. [less ▲]

Detailed reference viewed: 50 (5 ULg)
Full Text
Peer Reviewed
See detailOMASES: A DYNAMIC SECURITY ASSESSMENT TOOL FOR THE NEW MARKET ENVIRONMENT
Bihain, André; Cirio, Diego; Fiorina, Mario et al

(2003, June 26)

The paper presents the efforts and results of a large consortium of European Industries, Research Centers and Universities involved in an EU research project named OMASES in the field of Power System ... [more ▼]

The paper presents the efforts and results of a large consortium of European Industries, Research Centers and Universities involved in an EU research project named OMASES in the field of Power System Dynamic Security Assessment (DSA). The overall structure of an on-line DSA tool including TSA – Transient Stability Assessment, VSA – Voltage Stability Assessment, TS – Training Simulator and MS – Market Simulator is reported. Some basic assumptions and methodological aspects of the tool are presented considering its possible use within actual or future Energy Management Systems under the new electric market environment. Scenarios set up for the validation phase and results are reported with reference to the Italian test facility. [less ▲]

Detailed reference viewed: 86 (1 ULg)
Full Text
Peer Reviewed
See detailAccueil et accompagnement des spectateurs: Le Fan coaching
Comeron, Manuel ULg

Conference (2003, June 24)

Préparation et l’organisation de grandes manifestations sportives par les autorités locales et régionales en Europe: S’agissant de la sécurité dans et aux alentours des stades, conception et entretien des ... [more ▼]

Préparation et l’organisation de grandes manifestations sportives par les autorités locales et régionales en Europe: S’agissant de la sécurité dans et aux alentours des stades, conception et entretien des stades, coordination entre les différents services et les niveaux d’autorités impliqués (national, régional, local) ; rôle des médias dans la gestion et la prévention des crises ; rôle du personnel d’encadrement (stadiers) à l’intérieur des stades pour prévenir la violence (formation); répartition des places dans les stades (séparation des spectateurs d’équipes rivales) par un système de contrôle et de vente des billets ; Concernant l’accueil et l’accompagnement des spectateurs : encadrement des spectateurs : par des stands d’accueil des supporters visiteurs dans les villes d’accueil « Ambassades de supporters » ; par un accompagnement socio-éducatif permanent des supporters (« fan-coaching ») ; enseignements des « bonnes pratiques » diffusées dans le cadre du Réseau européen « EUROFAN » ; S’agissant de la participation de la population locale, conception associant la population locale à des animations socio-culturelles dans les villes d’accueil. [less ▲]

Detailed reference viewed: 36 (6 ULg)
Peer Reviewed
See detailA set of efficient numerical tools for floodplain modelling
Dewals, Benjamin ULg

Conference (2003, June 17)

Detailed reference viewed: 8 (1 ULg)
See detailIntérêt du dosage des glycoprotéines associées à la gestation (PAGs), comparés à la progestérone, dans le diagnostic de la gestation chez la chèvre bédouine
Charallat-Chérif, S; Sulon, J; Amirat, Z et al

in Intérêt du dosage des glycoprotéines associées à la gestation (PAGs), comparés à la progestérone, dans le diagnostic de la gestation chez la chèvre bédouine (2003, June 17)

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailDiane Project: Women’s Entrepreneurship
Constantinidis, Christina ULg; Cornet, Annie ULg

Conference (2003, June 16)

Detailed reference viewed: 22 (2 ULg)
See detailRadiosynthèses d'antagonistes des récepteurs 5-HT1A.
Defraiteur, C.; Plenevaux, Alain ULg; Lemaire, Christian ULg et al

Poster (2003, June 13)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailMise au point de sondes pour l'étude du système sérotoninergique par tomographie à émission de positons (TEP)
Giacomelli, Fabrice ULg; Lemaire, Christian ULg; Plenevaux, Alain ULg et al

Poster (2003, June 13)

La quantification de la vitesse de biosynthèse de la sérotonine ainsi que l'étude in vivo chez l'homme sont, du fait de l'implication cruciale des neurones sérotoninergiques dans de nombreuses fonctions ... [more ▼]

La quantification de la vitesse de biosynthèse de la sérotonine ainsi que l'étude in vivo chez l'homme sont, du fait de l'implication cruciale des neurones sérotoninergiques dans de nombreuses fonctions et pathologies cérébrales, des domaines d'études fondamentaux pour lesquels la TEP constitue un outil de choix. Ces différentes expérimentations peuvent être conduites suivant deux optiques: (i) emploi d'un traceur capable de suivre la chaîne métabolique du tryptophane conduisant à la sérotonine tout en évitant les autres voies métaboliques. (ii) utilisation d'un inhibiteur de la tryptophane hydroxylase (TPOH), enzyme limitante du processus. [less ▲]

Detailed reference viewed: 8 (0 ULg)
See detailRadiosynthèse de dérivés du 7-[18F]fluoroindole
Otabashi, Muhammad ULg; Giacomelli, Fabrice ULg; Lemaire, Christian ULg et al

Poster (2003, June 13)

Detailed reference viewed: 24 (3 ULg)
See detailTrophic links in the lowland river Meuse (Belgium): importance of the predation exerted by rotifers on bacterio- and protozooplankton.
Joaquim-Justo, Célia ULg; Pirlot, S; Viroux, Laurent et al

Conference (2003, June 07)

Trophic interactions within the plankton of the lowland river Meuse (Belgium) were measured in Spring and Summer (2001). Consumption of bacteria by protozoa was measured by monitoring the radioactivity ... [more ▼]

Trophic interactions within the plankton of the lowland river Meuse (Belgium) were measured in Spring and Summer (2001). Consumption of bacteria by protozoa was measured by monitoring the radioactivity disappearance of 3H-thymidine labelled bacteria. The proportion of protozoan bacterivory attributable to flagellates and ciliates was determined with fluorescently labelled bacteria (FLB). Metazooplankton bacterivory was assessed with 0.5 µm fluorescent microparticles (FMPs) and predation of metazooplankton on ciliates was measured by using natural ciliate assemblages labelled with FMPs as tracer food. Grazing of metazooplankton on flagellates was determined through in situ incubations with manipulated metazooplankton densities. flagellates were the main bacterial consumers their grazing being 91  10 % of total bacterial grazing. Metazooplankton, essentially rotifers, grazing on bacteria was negligible compared to grazing by protozoa and to bacterial production. Protozoa grazing balanced bacterial production in early samplings but was lower in July. Predation of rotifers on heterotrophic flagellates (HF) was generally low (1.765 3.432 mg C m-3 d-1 ), the higher contribution of HF in the diet of rotifers being observed when Keratella cochlearis was the dominant metazooplankter. Predation of rotifers on ciliates was low in the first samples (0.557  0.004 mg C m-3 d-1) in contrast to measurements performed in July (8.722  1.363 mg C m-3d-1). The proportion of protozoa in the diet of rotifers was generally low compared to phytoplankton (< 30% of total carbon ingestion) except when phytoplankton biomass decreased below the incipient limiting level (ILL) of the main metazooplantonic species. In such conditions, protozoa (mainly ciliates) constituted ca. 50% of total rotifer food. These results give evidence that microbial organisms play an important role within the plankton of the river Meuse, ciliates providing an alternative food for metazooplankton when phytoplankton becomes scarce. [less ▲]

Detailed reference viewed: 14 (0 ULg)
See detailHypertension artérielle et risque cardio-vasculaire
Krzesinski, Jean-Marie ULg

Conference (2003, June 05)

Detailed reference viewed: 5 (0 ULg)
Full Text
Peer Reviewed
See detailFeasibility study of the development of Intermodal Freight transport between Belgium and Bulgaria
Marchal, Jean ULg; KISHEVA, Diana; ZHANG, Zhaomin

in Port Development and Coastal Environment (2003, June 04), PDCE 2003

The aim of the project was to perform a feasibility study for possible development of freight intermodal transport links between Belgium and Bulgaria, between North and Black sea and vice versa, taking ... [more ▼]

The aim of the project was to perform a feasibility study for possible development of freight intermodal transport links between Belgium and Bulgaria, between North and Black sea and vice versa, taking inland waterways (iww) transport mode as basic one. The key focus is assessment of benefits in adopting an intermodal manner for transferring cargo instead of the single transport mode currently in use. The paper comprises short description of trans-continental infrastructure between Belgium and Bulgaria and its abilities to serve for different transport alternatives, definitions and choice of appropriate scenarios for realising predicted cargo flows, as well as cost calculations. Comparative analysis of the considered transport alternatives has been made. The most important results obtained are transport cost evaluation and benefit assessment for investigated transport scenarios [less ▲]

Detailed reference viewed: 89 (6 ULg)
Full Text
Peer Reviewed
See detailPrevalence of microalbuminuria in hypertensive patients: A Belgian promise survey
Krzesinski, Jean-Marie ULg; Lins, R. L.; Melsens, J. et al

in Journal of Hypertension (2003, June), 21(Suppl. 4), 71

Detailed reference viewed: 5 (1 ULg)
See detailPhysiological characterization of Biofidobacterium for probiotic use.
Majad, L.; Evrard, P.; Thonart, Philippe ULg

Poster (2003, June)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailLong range seasonal movements of northern pike (Esox lucius L.) in the barbel zone of the River Ourthe (River Meuse basin, Belgium).
Ovidio, Michaël ULg; Philippart, Jean-Claude ULg

Conference (2003, June)

In order to study the annual activity cycle and reproductive ecology of northern pike (Esox lucius L.) in the River Ourthe (Belgian Ardenne), 6 fish (579-742mm FL, 1605-4090g, 2 females and 4 males) were ... [more ▼]

In order to study the annual activity cycle and reproductive ecology of northern pike (Esox lucius L.) in the River Ourthe (Belgian Ardenne), 6 fish (579-742mm FL, 1605-4090g, 2 females and 4 males) were captured by electric fishing in November 2000 and January 2001. They were surgically implanted with a radio-transmitter and tracked for 149 to 349 days in a 30-km river stretch. During the pre-spawning period in winter, most movements were between distinct holding areas spaced from 40 to 550 m. All the pike began the upstream spawning migration between 8 February and 30 March 2001, when the mean water temperature varied from 6.7°C to 8.7 °C and the water flow from 52 to 199 m3s-1. The six pike travelled upstream, over distances ranging from 0.75 km to 15.7 km to reach their potential spawning sites. Pike arrived on their potential spawning sites between the 13 February and the 02 April 2001 and remained there from 5 to 25 days when the daily mean water temperature ranged from 2.9 to 10.0 °C. The six pike moved downstream after spawning and showed similar behaviour to those observed prior to spawning, but the distances between holding areas were more extended than during the winter pre-spawning period. When considering the entire tracking period, the longitudinal extension of the activity domains ranged 1 421 to 24 798 m (mean 12,050 m). This exploratory study provided original observations on northern pike movements in a barbel zone of the River Meuse basin. Results contrasted with the widely established view of pike being a sedentary predator and provides data on its behaviour throughout the annual cycle. [less ▲]

Detailed reference viewed: 53 (3 ULg)
Full Text
Peer Reviewed
See detailEvaluation of the patient's quality of life by her relative in a breast cancer population
Bragard, Isabelle ULg; Conradt, S.; Barchiesi, D. et al

in Psycho-Oncology (2003, June), 12(4, Suppl. S), 205-206

Detailed reference viewed: 18 (6 ULg)
Full Text
Peer Reviewed
See detailQualification of BSO crystals for use onboard the International Space Station
Georges, Marc ULg; Dupont, Olivier ULg; Zayer, I. et al

in Delaye, Ph; Denz, C.; Mager, L. (Eds.) Photorefractive Effects, Materials, and Devices (2003, June)

BSO crystals are excellent recording media for use in the holographic instrument of a multiple diagnostic instrument (Fluid Science Laboratory), for monitoring fluid phenomena onboard the ISS. Some ... [more ▼]

BSO crystals are excellent recording media for use in the holographic instrument of a multiple diagnostic instrument (Fluid Science Laboratory), for monitoring fluid phenomena onboard the ISS. Some experiments have been already presented that showed the potentiality of BSO for this kind of application. Here we present the crystals qualification for use within FSL with respect to gamma rays and protons radiations [less ▲]

Detailed reference viewed: 3767 (3 ULg)
Full Text
See detailOn the use of control surface excitation in flutter testing
Wright, Jan R; Wong, Jerry; Cooper, Jonathan Edward et al

in Proceedings of the 2003 International Forum on Aeroelasticity and Structural Dynamics (2003, June)

Flutter testing is used to demonstrate that the aircraft flight envelope is flutter free. Response measurements from deliberate excitation of the structure are used to identify and track frequency and ... [more ▼]

Flutter testing is used to demonstrate that the aircraft flight envelope is flutter free. Response measurements from deliberate excitation of the structure are used to identify and track frequency and damping values against velocity. In this paper, the common approach of using a flight control surface to provide the excitation is examined us ing a mathematical model of a wing and control surface whose rotation is restrained by a simple actuator. In particular, it is shown that it is essential to use the demand signal to the actuator as a reference signal for data processing. Use of the actuator force (or strain) or control angle (or actuator displacement) as a reference signal is bad practice because these signals contain response information. It may also be dangerous in that the onset of flutter may not be seen in the test results. Control sur face flutter is of particular concern. [less ▲]

Detailed reference viewed: 59 (0 ULg)
See detailCharacterisation and identification of new strain of the lactobacilus casei group
Bayane, A.; Diawara, B.; Roblain, D. et al

Poster (2003, June)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailNonlinear Aeroelastic Research at the Dynamics and Aeroelasticity Research Group
Dimitriadis, Grigorios ULg

Conference (2003, June)

This work is a presentation of the recent research in nonlinearity carried out at the Dynamics and Aeroelasticity Research Group (DARG) of the University of Manchester, School of Engineering

Detailed reference viewed: 56 (0 ULg)
Full Text
Peer Reviewed
See detailHolographic interferometry with a 90 degrees photorefractive crystal geometry
Georges, Marc ULg; Pauliat, G.; Weidner, E. et al

in Delaye, Ph; Denz, C.; Mager, L. (Eds.) Photorefractive Effects, Materials, and Devices (2003, June)

Holographic interferometers are generally designed in the common geometry where both interfering waves (reference and object) enter the crystal by the same window (co-propagating configuration). The ... [more ▼]

Holographic interferometers are generally designed in the common geometry where both interfering waves (reference and object) enter the crystal by the same window (co-propagating configuration). The alternative presented here consists in using a reference beam entering the crystal by a lateral face. The crystal has to be cut adequately in order to obtain electro-optic properties similar to that of the co-propagating configuration but with a smaller optical scattering noise. Therefore higher signal-to-noise ratios are expected in the interferograms. We will present the main features and constraints of this configuration together with the experimental study of its noise characteristics. This work has been performed for sillenite and semiconductor crystals [less ▲]

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailGenetic engineering of the beta-oxydation pathway in the yeast Yarrowia lipolytica to increase the production of aroma compounds
Waché, Y.; Groguenin, A.; Escamilla Garcia, E. et al

in Chemické Listy (2003, June), 97

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailOn-Line Performance Monitoring and Engine Diagnostic Using Robust Kalman Filtering Techniques
Dewallef, Pierre ULg; Léonard, Olivier ULg

in Proceedings of the ASME Turbo Expo 2003 (2003, June)

In this contribution, an on-line engine performance monitoring is carried out through an engine health parameter estimation based on several gas path measurements. This health parameter estimation makes ... [more ▼]

In this contribution, an on-line engine performance monitoring is carried out through an engine health parameter estimation based on several gas path measurements. This health parameter estimation makes use of the analytical redundancy of an engine model and therefore implies the knowledge of the engine state. As the latter is a priori not known the second task is therefore an engine state variable estimation. State variables here designate working conditions such as inlet temperature, pressure, Mach number, rotational speeds, . . . Estimation of the state variables constitutes a general application of the Extended Kalman Filter theory, while the health parameter estimation is a classical recurrent regression problem. Recent advances in stochastic methods [1] show that both problems can be solved by two Kalman filters working jointly. Such filters are usually named Dual Kalman Filters. The present contribution aims at using a dual Kalman filter modified to provide robustness. This procedure should be able to cope with as much as 20 to 30% of faulty data. The resulting online method is applied to a turbofan model developed in the frame of the OBIDICOTE 1 project. Several tests are carried out to check the performance monitoring capability and the robustness that can be achieved. [less ▲]

Detailed reference viewed: 49 (0 ULg)
Peer Reviewed
See detailStocks and fluxes of metals in a Luvisol of a contaminated suburban field.
Dere, Christelle ULg; Lamy, Isabelle; Cornu, Sophie et al

Poster (2003, June)

Detailed reference viewed: 15 (2 ULg)
Full Text
See detailThe new digitized geological map of Wallonia and its applications
Barchy, Laurent; Marion, Jean-Marc ULg

Poster (2003, June)

Objectives: understanding of geological phenomena, development of new methodologies and techniques, to produce and disseminate pertinent, high-quality data and to provide for public authorities: - Surface ... [more ▼]

Objectives: understanding of geological phenomena, development of new methodologies and techniques, to produce and disseminate pertinent, high-quality data and to provide for public authorities: - Surface, subsurface and natural-ressource management - Preventing natural risks and pollution - Regional planning and developmentthe necessary tools [less ▲]

Detailed reference viewed: 12 (3 ULg)
Full Text
See detailNew geological map of Wallonia (south part of Belgium)... Now Online. Integration with other mapping projects of the Walloon Region Ministry
Barchy, Laurent; Marion, Jean-Marc ULg

Poster (2003, June)

Objectives: understanding of geological phenomena, development of new methodologies and techniques, to produce and disseminate pertinent, high-quality data and to provide for public authorities: - Surface ... [more ▼]

Objectives: understanding of geological phenomena, development of new methodologies and techniques, to produce and disseminate pertinent, high-quality data and to provide for public authorities: - Surface, subsurface and natural-ressource management - Preventing natural risks and pollution - Regional planning and developmentthe necessary tools [less ▲]

Detailed reference viewed: 24 (0 ULg)
Full Text
See detailDynamic holographic interferometry with photorefractive crystals : review of applications and advanced techniques
Georges, Marc ULg; Thizy, Cédric ULg; Scauflaire, W. et al

in Gastinger, K.; Lokberg, O.; Winther, S. (Eds.) Speckle Metrology 2003 (2003, June)

We will present the basic properties of photorefractive crystals and show how they can be used efficiently in holographic interferometry experiments. We then will present some holographic systems and ... [more ▼]

We will present the basic properties of photorefractive crystals and show how they can be used efficiently in holographic interferometry experiments. We then will present some holographic systems and their numerous applications. With continuous illumination, we will show classical non destructive testing (defect detection), displacement metrology, vibration mode shape visualization, as well as a study for the use of photorefractive crystals in microgravity monitoring of fluid (FSL experiment aboard the International Space Station). With pulsed illumination we will present the possibilities of the photorefractive crystals in vibration measurement (and will introduce the ongoing EC-funded PHIFE research project). The purpose of the paper is to unmystify photorefractive crystals and to show that they could be a good alternative to traditional speckle-based techniques for highly demanding applications. For that we will highlight the highest resolution achieved as well as the high temporal dynamics of the holographic recording [less ▲]

Detailed reference viewed: 10 (0 ULg)
Full Text
Peer Reviewed
See detailIn-plane and out-of-plane holographic interferometry with multibeam photorefractive recordings in sillenite photorefractive crystals
Thizy, Cédric ULg; Georges, Marc ULg; Scauflaire, V. et al

in Delaye, Ph; Denz, C.; Mager, L. (Eds.) Photorefractive Effects, Materials, and Devices (2003, June)

In this paper we present results of the multiple beams recording in photorefractive crystals for multidirectional measurement of object displacement by holographic interferometry. Taking advantage of the ... [more ▼]

In this paper we present results of the multiple beams recording in photorefractive crystals for multidirectional measurement of object displacement by holographic interferometry. Taking advantage of the possibility to record several holograms in the photorefractive crystal without noticeable cross-talk and loss of signal-to-noise ratio, we demonstrate the applicability of this technique to high resolution metrology and nondestructive testing. A first part of the paper is devoted to metrological certification of the process. On the basis of known "in-plane" and "out-of plane" movements, we certify the measurement deconvolution algorithm and error. A second part will concern the measurement of thermo-mechanical composite material properties (Poisson coefficient, ...) with a compact transportable head using double recording illumination [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailFuzzy K-NN applied to moulds detection
Kuske, Martyna; Rubio, R.; Nicolas, Jacques ULg et al

in Proceedings of ISOEN'03 (2003, June)

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be ... [more ▼]

The possibility to detect Aspergillus versicolor growing on different building materials by a metal oxide sensor array is studied. Results show that an accurate classification rate of 89 +/- 3% can be obtained combining an extended linear discriminant analysis plus a fuzzy k-NN classifier. The classification ability of the classifier is assessed within the dataset by crossvalidation and also in a second dataset collected 5 months later. There is a slight decrease in the classification performance for all the algorithms, being the most sensitive the most accurate one. [less ▲]

Detailed reference viewed: 21 (4 ULg)
Full Text
See detailGIS and hydrogeological mapping of the Walloon Region (Belgium).
Bouezmarni, Mohamed ULg; Habils, F.; Nogarède, P. et al

Conference (2003, June)

Detailed reference viewed: 12 (2 ULg)
See detailMonitoring effectiveness of the EU Nitrates Directive Action Programmes : approach in Wallonia, an action program towards sustainable nitrogen management in agriculture
Delloye, Francis; Dewez, Arnaud; Gerard, O. et al

in Monitoring effectiveness of the EU Nitrates Directive Action Programmes (2003, June)

Detailed reference viewed: 28 (3 ULg)
Peer Reviewed
See detailSum-frequency generation characterization of the molecular recognition of avidin by biocytin films adsorbed on metallic substrates
Dreesen, Laurent ULg; Humbert, Christophe; Sartenaer, Yannick et al

Poster (2003, June)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailOn-site follow up of the characterisitics of controlled backfill, using the Time Domain Reflectometry moisture-measurement method.
Gille, A.; Geerts, G.; Mella, J.-P. et al

Conference (2003, June)

Detailed reference viewed: 8 (4 ULg)
See detailLa malformation de Chiari I chez l'adulte: évolution récente de la prise en charge
Noudel, R; Bazin, A; Litré, Claude Fabien ULg et al

Conference (2003, June)

Detailed reference viewed: 5 (0 ULg)
See detailAirborne hyperspectral potential for coastal biogeochemistry of the Scheldt estuary and plume
Shimoni, Michal; Sirjacobs, Damien ULg; Borges, Alberto ULg et al

Conference (2003, June)

Estuaries are obligate pathways for the transfer of dissolved and particulate material from the continent to the marine system. The tidal regime of some estuaries leads to an increased residence time of ... [more ▼]

Estuaries are obligate pathways for the transfer of dissolved and particulate material from the continent to the marine system. The tidal regime of some estuaries leads to an increased residence time of the freshwater in the estuarine mixing zone and pronounced changes in the speciation of elements. European estuaries are subject to intense anthropogenic disturbance reflected in elevated loading of detrital organic matter, which induce high respiration rates and the production of large quantities of dissolved CO2. The Scheldt basin covers one of the most populated and industrialised areas of Europe and its tributaries drain an area of about 21,860 km2. The amounts of nutrients discharged by the Scheldt increased considerably during the past 20 years. Due to the dilution and metabolic processes of the downstream river flow in the estuary, an important variability of several parameters can be observed amongst which phytoplankton species and concentration, particulate organic matter, colour dissolved organic matter and suspended matter. In the present days, researches on the functioning of estuarine and coastal ecosystems are based on highly time consuming, costly sea campaigns and laboratory analyses. Although optical spaceborne remote sensing already proved useful in such coastal ecosystems studies, hyperspectroscopy opened a new dimension by allowing improved distinction of various biogeochemical compounds through characteristic spectral signature identification. The goal of this research is to explore the potential of CASI-SWIR airborne hyperspectroscopy in retrieving some of the biogeochemical parameters of interest in the Schedlt estuary and plume (Belgium-Netherlands coastal zone). A 13 sampling stations field survey was realised in order to cover as quickly as possible the wide range of water quality encountered from the mouth of the estuary to the outer limit of the plume. The numerous parameters and spectrum measured in each station were used for further remote sensing analysis, as well as to complete the interpretation of the observed environmental processes. Correlation was searched between classical ground truth measurements and the rich information provided by numerous CASI-SWIR spectral bands carefully chosen. These relations were used as an attempt to derive synoptic view of the spatial distribution of various biogeochemical parameters in the Scheldt estuary and plume. Synthesis of these hyperspectral-mapping products with other complementary satellite maps and ground data set may allow ocean scientists to derive substantial information about ecosystem processes in the Scheldt estuary and adjacent coast. [less ▲]

Detailed reference viewed: 29 (1 ULg)
Peer Reviewed
See detailTechnology Development for In-Flight Oxygen Collection TSTO's
Hendrick, Patrick; Verstraete, D.; Bizzari, Didier et al

in European Journal of Mechanical and Environmental Engineering, Vol. 48. N° 2. June 2003 (2003, June)

Detailed reference viewed: 19 (9 ULg)
Full Text
Peer Reviewed
See detailEffect of moxonidine on heart rates in hypertensive patients: A large scale surveillance study
Labaki, L.; Lins, R. L.; Van der Niepen, P. et al

in Journal of Hypertension (2003, June), 21(Suppl. 4), 325

Detailed reference viewed: 15 (2 ULg)
Full Text
Peer Reviewed
See detailOral monthly ibandronate: rationale and clinical potential in postmenopausal osteoporosis
Reginster, Jean-Yves ULg; McClung, M.; Coutant, K. et al

in Annals of the Rheumatic Diseases (2003, June)

Detailed reference viewed: 24 (11 ULg)
Full Text
See detailImprovements of some analysis methods for flight flutter test data using unsteady aerodynamic considerations
Dimitriadis, Grigorios ULg

in Proceedings of the 2003 International Forum on Aeroelasticity and Structural Dynamics (2003, June)

To date the analysis of data from ight utter tests is routinely carried out under the assumption of steady or, at best, quasi-steady aerodynamics. This approach is favored mainly because of its simplicity ... [more ▼]

To date the analysis of data from ight utter tests is routinely carried out under the assumption of steady or, at best, quasi-steady aerodynamics. This approach is favored mainly because of its simplicity. In this paper it is shown that, even for some very simple simulated aeroelastic systems, utter predictions that ignore the unsteadiness of aerodynamic loads can be signi cantly inaccurate. Then, two simple system identi cation techniques are proposed that can model both the steady and unsteady aerodynamic loads acting on an aeroelastic system in incompressible ow. These methods can be used in order to obtain a complete description of an aeroelastic system subject to unsteady aerodynamic forces, including its dependence on ight conditions. Finally, the new methods are applied to a simple simulated unsteady aeroelastic model. The resulting utter predictions are compared to those obtained from two standard ight utter test data analysis approaches and are shown to be signi cantly more accurate. [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailA new tool for testing transmitter's implantation impact on fish: the computerized video tracking
Jadot, Catherine; Donnay, Annick ULg; Ylieff, Marc ULg et al

Poster (2003, June)

Detailed reference viewed: 6 (2 ULg)
Peer Reviewed
See detailFeedback Mechanisms in Intra-Cellular Dynamics
Conzelmann, H.; Sauter, T.; Bullinger, Eric ULg et al

Conference (2003, May 29)

Detailed reference viewed: 11 (0 ULg)
Full Text
See detailStudy of the interaction of polycations with human red blood cells
Grandfils, Christian ULg; Barakat, I; Verraes, S et al

Conference (2003, May 25)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailReferential communication in Fragile-X syndrome
Comblain, Annick ULg; Elbouz, Mouna

Poster (2003, May 23)

Language profile of fragile-X syndrome individuals looks like the one of Down syndrome individuals, except for phonological and pragmatic abilities. If the pragmatic aspect of language is relatively ... [more ▼]

Language profile of fragile-X syndrome individuals looks like the one of Down syndrome individuals, except for phonological and pragmatic abilities. If the pragmatic aspect of language is relatively preserve in Down syndrome, it is one of the most impaired language component in fragile-X syndrome. One aspect of the pragmatic component of language remains almost unexplored in this pathology : the common ground management and the organization of the old and the new information in conversation. Sample : 4 fragile-X boys aged from 6 to 12 years-old and 4 typically developing children matched on the lexical age Tasks : 6 referential communication tasks proposed to children both in speaker condition and in listener condition. Tasks were distributed in two groups : 1] building tasks, and 2] combination tasks. Groups of 2 boys work together on referential communication tasks. In simple situations FXS boys can be as efficient speakers and listeners as typically developing children. Difficulties mainly appear when FXS boys have to deal with spatial and ordinal attributes. FXS boys manage less efficiently with an incomplete message especially when it is given by an adult. In FXS syndrome, the efficiency of communication mainly depends of the nature of the items attributes to communicate. Spatial information implies the mastery of vocabulary and concepts which seems to be deficient in several etiologies of mental retardation including FXS boys. Ordinal information implies the manipulation of information that are intrinsically more demanding than nominal dimensions because they are inherently relational. [less ▲]

Detailed reference viewed: 30 (5 ULg)
Peer Reviewed
See detailReferental communication in Down syndrome : Assessment and remediation program
Elbouz, Mouna; Comblain, Annick ULg

Poster (2003, May 23)

Referential communication focuses on the reference process which consists in using words in order to describe objects called "referents". The ability of someone to give information regarding what he sees ... [more ▼]

Referential communication focuses on the reference process which consists in using words in order to describe objects called "referents". The ability of someone to give information regarding what he sees, thinks or feels as well as his ability to understand messages that he hears slowly develops between 6 and 11 years-old in normally developing children. Development of these abilities in Down syndrome children is much more difficult as these children seem to be relatively insensitive to the interlocutor needs in a situation of communication. Our study focuses on the ability oaf Down syndrome children in giving or receiving a correct message. The paradigm we used is the one of Glucksberg et al. (1966). The eight selected Down syndrome children were between 4;10 and 8;5 years-old (the youngest group) and 12;1 and 14;1 (the oldest group). They were matched with a group of normally developing children on the basis of metal age. Different referential communication tasks were proposed as a pre-test. Each child was assessed in the speaker (with another child first and secondly with and adult) and receptor situation (only with another child). At the end of the pre-test, half of the Down syndrome children received training activities of referential communication during 8 weeks. After the training sessions, the children were post-tested. The results show qualitative and quantitative differences between the youngest and the oldest Down syndrome children, on one hand, and between normally developing children and Down syndrome on the other hand. The messages of Down syndrome children are less spontaneous than those of normally developing children, the messages contain fewer information and the responses are more often inadequate. The training seems to have positive effects on Down syndrome children performances, especially on the oldest children. But we notice that the training seems to influence the speaker abilities only. The receptor abilities seems to remain unaffected by the training sessions. Our study gives some information about the area of language the less studied in Down syndrome. However, researches are still necessary in order to complete the intervention perspectives. [less ▲]

Detailed reference viewed: 49 (3 ULg)
Peer Reviewed
See detailComparaison de trois méthodes d'apprentissage dans la maladie d'Alzheimer
Bier, Nathalie; Gagnon, Lise; Van der Linden, Martial et al

Poster (2003, May 23)

Detailed reference viewed: 18 (2 ULg)
See detailStudy of the potential role of tilted peptides in transconformation: Theoritical analysis of amyloidogenic proteins
Crowet, Jean-Marc ULg; Brasseur, Robert ULg; Thomas, Annick et al

Poster (2003, May 23)

Amyloidogenic proteins are of interest in the study of transconformational processes because they undergo a major conformational change leading to amyloid fibrils formation by a self-assembly of their ... [more ▼]

Amyloidogenic proteins are of interest in the study of transconformational processes because they undergo a major conformational change leading to amyloid fibrils formation by a self-assembly of their misfolded form.  Amyloid fibrils are implied in several diseases such as Alzheimer, Parkinson or Creutzfeldt-Jakob diseases. At a structural point of view they have varying lengths up to few micrometers, they are unbranched and the individual β strands are oriented perpendicular to the long axis of the fibril. Moreover, the conformational changes induce an increase in the β content. However little is known about the mechanisms of transconformation, the subsequent aggregation and the toxicity of these proteins. Study of these misfolded proteins, and particularly the study of their conformation, is difficult due to their high tendency to aggregate in solution.  Regarding the transconformational mechanisms, it’s interesting to study the potential role of tilted peptides because they possess several properties that could be involved in this process. They can adopt  or β conformation depending on the environment and when helical they can destabilize the hydrophilic/hydrophobic interface of an organised system. They were notably found in the domain undergoing transconformation in the A protein (Alzheimer’s disease) and in PrP (prion diseases). They could have an important role in the first step of the transconformational process ; their destabilizing properties could also be implied in the toxicity of these proteins.  The aim of this study is to analyse the sequence of amyloidogenic proteins undergoing  to  transition, looking for tilted peptides. From their primary sequence, Eisenberg’s hydrophobic moment plot, hydrophobic cluster analysis, Jähnig’s plot and several methods for the prediction of secondary structure have been carried out. Fragments corresponding to potential tilted peptides following different criteria (mean of hydrophobicity, length, …) were 3D built and their insertion into a simplified bilayer was simulated using the IMPALA method. A detailed study of the literature should provide more information about the particular properties of these sequences and the existence of these tilted peptides must be demonstrated by experimental techniques. The tilted fragment from -synuclein (Parkinson’s disease) is under current investigations. [less ▲]

Detailed reference viewed: 9 (0 ULg)
Full Text
Peer Reviewed
See detailLexical learning and generalization in children with Down syndrome
Elbouz, Mouna; Comblain, Annick ULg

Poster (2003, May 23)

We study the lexical learning by children who have a genetic syndrome leading to mental retardation, the Down syndrome. Children with Down syndrome learn the names of new objects displayed in a scene. Our ... [more ▼]

We study the lexical learning by children who have a genetic syndrome leading to mental retardation, the Down syndrome. Children with Down syndrome learn the names of new objects displayed in a scene. Our contribution explore to what extent the context associated with the object is beneficial or detrimental to the association between an object and its name in recall, production and a comprehension tasks. We assessed whether children with Down syndrome could learn four non-words associated with unfamiliar animals or musical instruments displayed in a scene (the context of presentation) and whether their performance would be influenced by the congruence of the context of presentation between the learning and the test phases. We hypothesized that the contextual congruence between the learning and the test will enhance children’s performance. In contrast, the association between an object and a new context in the test phase (compared to the association in the learning phase) would decrease performance. The results don’t confirm completely our hypothesis. There is no effect of context of presentation in recall and comprehension tasks. The effect of context of presentation is present only in denomination task. We compare this results with those of “normal” children. Consequences on lexical learning are discussed. [less ▲]

Detailed reference viewed: 45 (3 ULg)
See detailAcoustic-emission and dilatometric investigations of the influence of Cr on the austenite decomposition kinetics
Mertens, Anne ULg; van Bohemen, S. M. C.; Hermans, M. J. M. et al

Conference (2003, May 22)

The interest of small additions of Cr (< 3 wt%) in steels for automotive and bearing applications has been recently highlighted. The microstructure of these steels is primarily based on the bainitic phase ... [more ▼]

The interest of small additions of Cr (< 3 wt%) in steels for automotive and bearing applications has been recently highlighted. The microstructure of these steels is primarily based on the bainitic phase. Therefore, in order to optimize their microstructure and mechanical properties, it is of primary importance to gain a better understanding of the influence of Cr on austenite decomposition in different temperature regimes with a particular attention for the transition from ferrite to bainite and martensite formation. In the present study, the acoustic emission technique is used together with dilatometry and optical microscopy in order to obtain a full view of the transformation processes and kinetics. Specifically, acoustic emission is a technique that is capable of distinguishing a displacive from a diffusional transformation. [less ▲]

Detailed reference viewed: 8 (1 ULg)
Full Text
Peer Reviewed
See detailQualité de vie et qualité de vie au travail chez des policiers liégeois
Etienne, Anne-Marie ULg; Martel, J.-P.; Dupuis, G.

Conference (2003, May 21)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailA new tool for measuring positive and negative occupational stress : preliminary results of validation studies.
Grisard, A.; Mahy, A.; Hansez, Isabelle ULg et al

Conference (2003, May 17)

Detailed reference viewed: 4 (0 ULg)
See detailPolymer blending: a convenient technique for the preparation of new antimicrobial polymeric mateirals
Lenoir, Sandrine; Pagnoulle, Christophe; Petru, Stiube et al

Poster (2003, May 16)

Detailed reference viewed: 7 (2 ULg)
See detailPreparation and labelling of biodegradable drug nanocarriers
Rieger, Jutta ULg; Qiu, Hongjin; Mazza, Michaël et al

Poster (2003, May 16)

Detailed reference viewed: 8 (1 ULg)
See detailFunctionalization of AFM tips by electrografting
Jérôme, Christine ULg; Willet, Nicolas ULg; Gabriel, Sabine ULg et al

Poster (2003, May 16)

Detailed reference viewed: 18 (3 ULg)
See detailSynthesis of end functional (co)polymers, precursors of triblock copolymers by controlled radical polymerization
Grignard, Bruno ULg; Claes, Michaël; Sciannamea, Valérie et al

Poster (2003, May 16)

Detailed reference viewed: 13 (2 ULg)
See detailNovel biocompatible coatings strongly adhering onto stainless steel and carbon fibers, endowed with antibacterial properties
Ignatova, Miléna; Labaye, David-Emmanuel; Voccia, Samuel et al

Poster (2003, May 16)

Detailed reference viewed: 9 (1 ULg)
See detailGrafting of polystyryl anions onto carbon nanotubes
Lou, Xudong; Koulic, Christian; Pagnoulle, Christian et al

Poster (2003, May 16)

Detailed reference viewed: 8 (1 ULg)
See detailNafion layered-silicate nanocomposite membrane for fuel cell application
Thomassin, Jean-Michel ULg; Pagnoulle, Christophe; Caldarella, Giuseppe ULg et al

Poster (2003, May 16)

Detailed reference viewed: 19 (2 ULg)
See detailFrom spherical to cyclindrical micelles formed by polystyrene-b-poly(2-vinylpyridine)-b-poly(ethylene oxide) copolymer in water
Lei, Liangcai; Gohy, Jean-François; Willet, Nicolas ULg et al

Poster (2003, May 16)

Detailed reference viewed: 11 (4 ULg)
See detailBioactive poly(α-hydroxyacids)/Bioglass® composites with a tailord porous structure and resorbability, for bone tissue engineering
Pravata, Laurent; Maquet, Véronique; Boccacini, A. R. et al

Poster (2003, May 16)

Detailed reference viewed: 8 (2 ULg)
See detailStructure of diblock copolymers in aqueous solution in the presence of a classical surfactant
Vangeyte, Patrick; Leyh, Bernard ULg; Heinrich, M. et al

Poster (2003, May 16)

Detailed reference viewed: 25 (2 ULg)
See detailSynthesis of macrocyclic polyesters
Lecomte, Philippe ULg; Jérôme, Robert ULg

Poster (2003, May 16)

Detailed reference viewed: 9 (3 ULg)
See detailSurface modification of metallic stents by strongly adhering aliphatic polyesters
Aqil, Abdelhafid ULg; Voccia, Samuel; Labaye, David-Emmanuel et al

Poster (2003, May 16)

Detailed reference viewed: 15 (3 ULg)
See detailNanostructuration of polyamide-based polymer blends by reactive blending
Koulic, Christian; Pagnoulle, Christian; Jérôme, Robert ULg

Poster (2003, May 16)

Detailed reference viewed: 19 (3 ULg)
Full Text
See detail2-oxepane-1,5-dione: a precursor of a novel class of versatile semicrystalline biodegradable (co)-polyesters
Latere Dwan'Isa, Jean-Pierre; Lecomte, Philippe ULg; Dubois, Philippe et al

Poster (2003, May 16)

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4 cyclohexanedione and ring-opening polymerized by 1-phenyl- 2-propanol / tin octoate with formation of a semicrystalline ... [more ▼]

2-oxepane-1,5-dione (OPD) was synthesized by Baeyer-Villiger oxidation of 1,4 cyclohexanedione and ring-opening polymerized by 1-phenyl- 2-propanol / tin octoate with formation of a semicrystalline polyester of high melting temperature (Tm :147°C). Dibutyin dimethoxide and 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) proved to be efficient initiators for the random copolymerization of ε-caprolactone (εCL) and OPD. Random distribution of the comonomer units was confirmed by DSC, 1H and 13C NMR analyses. A single Tm was observed, which varies regularly and monotonically with the OPD content as result of a cocrystallisation phenomenon. The single glass transition temperature (Tg) obeys the Fox equation. It is noteworthy that a copolymer containing 30 mol % OPD exhibits a Tm of 90°C. It is stable up to 140°C under nitrogen for one hour, such that processing by extrusion is quite possible. The OPD decomposition is maximum at 223°C for a heating rate of 10°C/min. The mechanism of thermal degradation was investigated and cleared up. The ketone increases the copolymer hydrophilicity and thus sensitivity to hydrolysis. The mechanical properties are quite reminiscent of PCL of comparable molecular weight. Quite interestingly, OPD imparts sensitivity to photo-cross-linking to this novel class of materials. [less ▲]

Detailed reference viewed: 44 (1 ULg)
See detailPoly(α-chloro-ε-caprolactone), a new precursor for functionalized and graft polyesters
Riva, Raphaël ULg; Lenoir, Sandrine; Lecomte, Philippe ULg et al

Poster (2003, May 16)

Detailed reference viewed: 16 (2 ULg)
See detailStimuli-responsive core-shell-corona micelles in water
Willet, Nicolas ULg; Gohy, Jean-François; Varshney, Sunil et al

Poster (2003, May 16)

Detailed reference viewed: 11 (3 ULg)