References of "Scientific congresses and symposiums"
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See detailA genome scan for athletic performance in the thoroughbred.
Durkin, Keith ULg; Raudsepp, T; Skow, L.C. et al

Poster (2008, July)

Detailed reference viewed: 13 (0 ULg)
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See detailEnfance, transmission et individualisation. Le cas des enfants mineurs du Katanga (RDC)
Andre, Géraldine ULg; Godin, Marie; Mrsic-Garac, Sonia

Conference (2008, July)

Detailed reference viewed: 18 (0 ULg)
See detailPolitical Discourses for Global Audiences: The Effect of Cultural Resonance
La Porte, María Teresa; Azpíroz Manero, María Luisa ULg

Conference (2008, July)

Detailed reference viewed: 22 (5 ULg)
Peer Reviewed
See detailPregnancy diagnosis in the mare by semi quantitative relaxin quick assay kit
Ponthier, Jérôme ULg; van de Weerdt, marie-Lys; Deleuze, Stefan ULg

in Reproduction in Domestic Animals (2008, July), 43(s3), 111

Detailed reference viewed: 70 (10 ULg)
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See detailNMR Studies of Solutions of Actinide Ions and their Complexes. Relaxation and Spectroscopy
Braekers, Damien; Peters, Christelle; Vidick, Geoffrey ULg et al

Poster (2008, July)

Detailed reference viewed: 32 (12 ULg)
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See detailSize-adaptive spherical receptor acceleration method for acoustical ray tracing
Lesoinne, Stéphane ULg; Embrechts, Jean-Jacques ULg

in Proceedings of the 5th Forum Acusticum "Acoustics '08" (2008, July)

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See detailGenetic parameters of stearoyl coenzyme-A desaturase 9 activity estimated by test-day model
Arnould, Valérie ULg; Gengler, Nicolas ULg; Soyeurt, Hélène ULg

Conference (2008, July)

Dairy and beef products account for a large part of fat intake in human nutrition and therefore can be linked to dietary diseases. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a ... [more ▼]

Dairy and beef products account for a large part of fat intake in human nutrition and therefore can be linked to dietary diseases. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a potential functional candidate gene affecting milk fat composition in dairy cattle. The objective of this research was to estimate the genetic parameters of delta-9 activity indicator traits and to study the relationship between delta-9 activity as described by these indicator traits and common milk production traits. A total of 126,331 test-day records were obtained from 14,259 Holstein (> 84% Holstein gene) heifers belonging to 105 herds. The studied traits were milk yield, percentages of fat and protein, content of monounsaturated fatty acids, and 3 ratios reflecting the delta-9 activity (C14:1/ C14:0; C16:1/C16:0 and C18:1/C18). The used model was a multiple-trait random regressions test-day model and included as fixed effects: herd x date of test, class of age, and month x year. Random effects were herd x year of calving, permanent environmental, additive genetic, and residual effects. The fatty acid contents were estimated by mid-infrared spectrometry. Delta-9 activity varied within year and lactation. The obtained heritability estimates of delta-9 as well as the genetic and phenotypic correlation varied also through lactation. This study suggests potential improvements of delta-9 activity and subsequently milk fat composition can be achieved by animal management but also by breeding and animal selection. [less ▲]

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See detailInterference in the light emitted by a single tunneling atom
Martin, John ULg; Braun, Daniel

Poster (2008, July)

Detailed reference viewed: 6 (1 ULg)
Peer Reviewed
See detailPenile aneurysmal bone cyst causing urethral obstruction in a dog
Saulnier-Troff, François-Guillaume; Busoni, Valeria ULg; Hamaide, Annick ULg

Poster (2008, July)

Detailed reference viewed: 14 (0 ULg)
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See detailDevelopment of Liquid-Flooded Scroll Compressor and Expander Models
Bell, Ian; Lemort, Vincent ULg; Braun, Jim et al

(2008, July)

The Liquid Flooded Ericsson Cooler (LFEC) is a gas refrigeration cycle that uses liquid flooding of both the compressor and the expander to achieve nearly isothermal compression and expansion processes as ... [more ▼]

The Liquid Flooded Ericsson Cooler (LFEC) is a gas refrigeration cycle that uses liquid flooding of both the compressor and the expander to achieve nearly isothermal compression and expansion processes as developed by Hugenroth et al. (2007). Efficiency of the LFEC strongly depends on the efficiencies of the compressor and the expander. It is hoped that the LFEC can be a commercially competitive cooling technology, but for these hopes to be realized, high efficiencies for the compressor and expander must be achieved. In order to optimize the design of the compressor and the expander, comprehensive models of both machines have been developed. Validation of the models and analysis of these machines are presented in two separate papers (Bell et al. 2008, Lemort et al. 2008). The models are mechanistic and allow investigation of the influence of design changes and operating conditions on performance. [less ▲]

Detailed reference viewed: 148 (5 ULg)
See detailInsertion de compétences managériales dans la magistrature belge: les conseillers en ressources humaines.
Delvaux, David ULg

Conference (2008, July)

Cela fait maintenant près de dix ans que la justice et les tribunaux belges sont le théâtre de profondes mutations. Qu’ils s’appellent Octopus, Coppernic ou plus récemment Thémis, ces plans ou accords ont ... [more ▼]

Cela fait maintenant près de dix ans que la justice et les tribunaux belges sont le théâtre de profondes mutations. Qu’ils s’appellent Octopus, Coppernic ou plus récemment Thémis, ces plans ou accords ont tous un sens commun réformateur: la modernisation de la Justice. Longtemps préservées de préoccupations organisationnelles et managériales, la Justice est aujourd’hui confrontée à des exigences d’efficacité et d’efficience, indicateurs modernes de qualité. Pour mener à bien ce processus de modernisation, un arsenal de moyens de différentes natures ont été développés. Dans le cadre de protocoles d’accords visant à réduire l’arriéré judiciaire, des conseillers en ressources humaines ont fait leur apparition dans nos juridictions. Porteurs de compétences managériales, ils ont pour mission d’épauler le chef de corps dans sa gestion quotidienne de la juridiction, dans le cadre d’une politique publique de rationalisation des pratiques judiciaires. Cette communication sera consacrée à l’insertion, par l’Etat, de compétences managériales – incarnées par ces conseillers en ressources humaines -au sein d’un corps organisé et doté d’une forte culture professionnelle historiquement ancrée, celui de la magistrature. [less ▲]

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See detailGenetic parameters of stearoyl coenzyme-A desaturase 9 activity estimated by test-day model
Arnould, Valérie ULg; Gengler, Nicolas ULg; Soyeurt, Hélène ULg

in Journal of Dairy Science (2008, July), 91(E-Suppl. 2), 542

Dairy and beef products account for a large part of fat intake in human nutrition and therefore can be linked to dietary diseases. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a ... [more ▼]

Dairy and beef products account for a large part of fat intake in human nutrition and therefore can be linked to dietary diseases. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a potential functional candidate gene affecting milk fat composition in dairy cattle. The objective of this research was to estimate the genetic parameters of delta-9 activity indicator traits and to study the relationship between delta-9 activity as described by these indicator traits and common milk production traits. A total of 126,331 test-day records were obtained from 14,259 Holstein (> 84% Holstein gene) heifers belonging to 105 herds. The studied traits were milk yield, percentages of fat and protein, content of monounsaturated fatty acids, and 3 ratios reflecting the delta-9 activity (C14:1/ C14:0; C16:1/C16:0 and C18:1/C18). The used model was a multiple-trait random regressions test-day model and included as fixed effects: herd x date of test, class of age, and month x year. Random effects were herd x year of calving, permanent environmental, additive genetic, and residual effects. The fatty acid contents were estimated by mid-infrared spectrometry. Delta-9 activity varied within year and lactation. The obtained heritability estimates of delta-9 as well as the genetic and phenotypic correlation varied also through lactation. This study suggests potential improvements of delta-9 activity and subsequently milk fat composition can be achieved by animal management but also by breeding and animal selection. [less ▲]

Detailed reference viewed: 46 (15 ULg)
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See detailIsoprenoid metabolism in aphid : A new target for bioinsecticides development
Vandermoten, Sophie ULg; Charloteaux, Benoît ULg; Santini, Sébastien et al

Poster (2008, July)

Detailed reference viewed: 30 (6 ULg)
Peer Reviewed
See detailMyofibroblastic inflammatory urinary bladder tumors in dogs: report of 8 cases
Bohme, Béatrice; Ngendahayo, P.; Hamaide, Annick ULg et al

Poster (2008, July)

Detailed reference viewed: 12 (0 ULg)
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See detailPROSPECTS OF AN IMPROVED SYSTEM PROTECTION SCHEME AGAINST VOLTAGE INSTABILITY IN THE RTE SYSTEM
Capitanescu, Florin ULg; Otomega, Bogdan; Lefebvre, Hervé et al

(2008, July)

This paper reports on prospective tests of a system protection scheme against long-term voltage instability relying on a set of distributed controllers, each monitoring a transmission voltage, blocking ... [more ▼]

This paper reports on prospective tests of a system protection scheme against long-term voltage instability relying on a set of distributed controllers, each monitoring a transmission voltage, blocking tap changers and shedding loads in a zone. The emergency actions adjust in magnitude and location to the disturbance. Each controller acts in closed loop, which guarantees robustness. The method is illustrated on a real-life model of the Western region of the RTE system. The choice of the controller settings is discussed in some detail and examples of performance are given, combining the above remedial action with capacitor switching and secondary voltage control. [less ▲]

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See detailEvaluating an ICT-Mediated Innovative Training Service from Users’ Perspective. An Exploratory Case Study
Peters, Stéphanie ULg; Ledent, Maryse ULg; Hansez, Isabelle ULg

Conference (2008, July)

By the way of a case study, this paper aims at evaluating the innovative dimension of a training service mediated through Information and Communication Technology (ICT): the so-called e-WOCCQ. The ... [more ▼]

By the way of a case study, this paper aims at evaluating the innovative dimension of a training service mediated through Information and Communication Technology (ICT): the so-called e-WOCCQ. The originality of this article is twofold: (1) to question innovation, and (2) to consider the training more commonly as a service, whose major particularity is the implication of the user in the process. The theoretical framework emphasises on the definition of a service and on the concept of added-value. As this experience took place at the very beginning of the project development, an empirical methodology was developed. We assume that the so-called e-WOCCQ is an innovation as it represents an added value for the users. Results show that e-WOCCQ generates costs and benefits of different order, and that the ratio is influenced by factors mostly linked either with the user. Practical (improvements and targeting) and theoretical (modelisation) implications are discussed. [less ▲]

Detailed reference viewed: 39 (5 ULg)
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See detailOn the Sets of Real Numbers Recognized by Finite Automata in Multiple Bases
Boigelot, Bernard ULg; Brusten, Julien ULg; Bruyère, Véronique

in Lecture Notes in Computer Science (2008, July), 5126

This paper studies the expressive power of finite automata recognizing sets of real numbers encoded in positional notation. We consider Muller automata as well as the restricted class of weak ... [more ▼]

This paper studies the expressive power of finite automata recognizing sets of real numbers encoded in positional notation. We consider Muller automata as well as the restricted class of weak deterministic automata, used as symbolic set representations in actual applications. In previous work, it has been established that the sets of numbers that are recognizable by weak deterministic automata in two bases that do not share the same set of prime factors are exactly those that are definable in the first order additive theory of real and integer numbers (R, Z, +, <). This result extends Cobham's theorem, which characterizes the sets of integer numbers that are recognizable by finite automata in multiple bases. In this paper, we first generalize this result to multiplicatively independent bases, which brings it closer to the original statement of Cobham's theorem. Then, we study the sets of reals recognizable by Muller automata in two bases. We show with a counterexample that, in this setting, Cobham's theorem does not generalize to multiplicatively independent bases. Finally, we prove that the sets of reals that are recognizable by Muller automata in two bases that do not share the same set of prime factors are exactly those definable in (R, Z, +, <). These sets are thus also recognizable by weak deterministic automata. This result leads to a precise characterization of the sets of real numbers that are recognizable in multiple bases, and provides a theoretical justification to the use of weak automata as symbolic representations of sets. [less ▲]

Detailed reference viewed: 102 (33 ULg)
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See detailCommunity-Based Health Insurance Schemes in Africa: Which Factors Really Induce Membership ?
Defourny, Jacques ULg; Failon, Julie ULg

Conference (2008, July)

Health micro-insurance systems have experienced a fast development for some fifteen years in sub-Saharan Africa as a means of improving the access of the poor to healthcare services. The present article ... [more ▼]

Health micro-insurance systems have experienced a fast development for some fifteen years in sub-Saharan Africa as a means of improving the access of the poor to healthcare services. The present article focuses mainly on community-based health insurance (CBHI) systems, as they currently constitute one of the most developed forms of health micro-insurance. However, it must be acknowledged that the enrolment rates remain particularly weak and coverage of the target population only rarely reaches 10%. Several authors have already observed this fact and undertaken research on the factors which influence enrolment. Nevertheless, the methodologies used, size of the samples, characteristics of the surveyed individuals, inclusion or not of non-members in the surveys, geographical areas etc. vary a lot from one author to the other. This is why this article aims at synthesizing the empirical studies carried out to date and to identify major concurring results beyond methodological differences. We finally come out with two factors which seem to play a major role and six others which seem to have a significant influence on enrolment, while surveys do not confirm the role of various other variables. We conclude with some lessons regarding the roles of the promoters and supporting NGOs in the establishment of CBHI schemes. [less ▲]

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See detailBuilding and HVAC system simulation with the help of an engineering equation solver
Bertagnolio, Stéphane ULg; Masy, Gabrielle; Andre, Philippe ULg et al

in Proceedings of the 3rd National conference of the IBPSA-USA, Berkeley, CA (2008, July)

A simplified Building-HVAC system model is presented here. It includes simplified models of building zone and of HVAC equipment. The simplified building zone model is based on a R and C network, whose ... [more ▼]

A simplified Building-HVAC system model is presented here. It includes simplified models of building zone and of HVAC equipment. The simplified building zone model is based on a R and C network, whose parameters are adjusted trough a frequency characteristic analysis. The implementation of the classical phenomena taking place in building dynamics is discussed. The simplified building model is compared with more detailed models, using the BESTEST procedure. The application of the presented model to the audit of commercial buildings is also discussed. [less ▲]

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See detailThe Io-Jupiter interaction: Clues from the Io UV footprint
Bonfond, Bertrand ULg

Conference (2008, July)

Detailed reference viewed: 2 (0 ULg)
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See detailImpact of physical properties of inulin on stability during moisture sorption.
Ronkart, Sébastien; Paquot, Michel ULg; Fougnies, C. et al

Poster (2008, July)

Detailed reference viewed: 44 (5 ULg)
See detailStochastic Modal Analysis of Structures with Random Shape Using X-FEM
Lepage, Séverine; Van Miegroet, Laurent ULg; Duysinx, Pierre ULg

Conference (2008, July)

Detailed reference viewed: 44 (2 ULg)
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See detailStrategies to incorporate genomic prediction into population-wide genetic evaluations
Gengler, Nicolas ULg; VanRaden, P. M.

in Journal of Dairy Science (2008, July), 91

Most current research on genomic selection is focusing on the accurate prediction of genomic breeding values. However selection solely based on genomic breeding values, despite being theoretically ... [more ▼]

Most current research on genomic selection is focusing on the accurate prediction of genomic breeding values. However selection solely based on genomic breeding values, despite being theoretically promising, is in practice only suboptimal for several reasons. The two most important are that only few animals are genotyped therefore having genomic prediction directly available and that rankings will change. With genomic breeding values potentially available in the near future, strategies are required to avoid any confusion in the mind of users. The aim of this study is to present three different strategies that could be used to incorporate genomic prediction into population-wide genetic evaluation. The three strategies are: 1) using selection index theory to combine both sources of information into a single set of breeding values; 2) for ungenotyped animals, compute conditional expectation of gene contents for SNP given molecular and pedigree data and use these predicted gene contents; and 3) integrate genomic breeding values as external information into genetic evaluation using a Bayesian framework. If strategy 1) is straight forward, additional steps have to be done to adjust breeding values for changes in those of relatives. A practical implementation is to use reliabilities of the genomic prediction, the population-wide genetic evaluation PA, and PA from the genotyped subset to set up a 3 x 3 matrix for each animal, with off-diagonal elements being functions of the 3 reliabilities. The use of strategy 2) is computationally much more challenging but leads directly to the needed covariance structures combining genomic relationship if known with pedigree relationships. Strategy 3) is potentially a good compromise because the theory is well established and has already been used in beef cattle to incorporate external breeding values. Also current genetic evaluation software can be easily modified to incorporate genomic breeding values [less ▲]

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See detailSUPPRESSION OF AEROELASTIC INSTABILITIES BY BROADBAND PASSIVE TARGETED ENERGY TRANSFERS
Lee, Young S.; McFarland, D. Michael; Vakakis, Alexander F. et al

in Sixth EUROMECH Nonlinear Dynamics Conference, Saint Petersbourg, 2008 (2008, July)

We study passive and nonlinear targeted energy transfers induced by transient resonant interactions between an essentially nonlinear attachment and an in-flow rigid wing model. We show that it is feasible ... [more ▼]

We study passive and nonlinear targeted energy transfers induced by transient resonant interactions between an essentially nonlinear attachment and an in-flow rigid wing model. We show that it is feasible to partially or even completely suppress aeroelastic instabilities in the wing (limit cycle oscillations-LCOs) by passively transferring broadband vibration energy from the wing to the attachment in a one-way irreversible fashion. We study the nonlinear dynamical mechanisms that govern TET and show that they are series of transient or sustained resonance captures in different resonance manifolds of the dynamics. Aeroelastic instability suppression is performed by partially or completely eliminating the triggering mechanism for aeroelastic instability. Through numerical parametric studies we identify three main mechanisms for suppressing aeroelastic instability, and investigate them in detail, both numerically by Empirical Mode decomposition (EMD), and analytically by slow/fast partitions of the transient dynamics. [less ▲]

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See detailModelling of in vitro mesenchymal stem cell cultivation, chondrogenesis and osteogenesis
Geris, Liesbet ULg; Peiffer, Véronique; Demol, Jan et al

in Journal of Biomechanics (2008, July), 41

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See detailA working methodology for the total water determination in inulin by the volumetric Karl Fischer titration.
Ronkart, Sébastien; Blecker, Christophe ULg; Fougnies, C. et al

Poster (2008, July)

Detailed reference viewed: 14 (2 ULg)
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See detailThe development and applications of a ground-based fiber nulling coronagraph
Martin, Stefan; Serabyn, Eugene; Liewer, Kurt et al

in Optical and Infrared Interferometry (2008, July)

Detailed reference viewed: 36 (3 ULg)
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See detailAPPLYING L. MANEVITCH’S COMPLEXIFICATION – AVERAGING METHOD TO ANALYZE CONDITIONS FOR OPTIMAL TARGETED ENERGY TRANSFER IN COUPLED OSCILLATORS WITH ESSENTIAL STIFFNESS NONLINEARITY
Sapsis, Themistoklis; Quinn, D. Dane; Gendelman, Oleg et al

in International Conference on Nonlinear Phenomena in Polymer Solids and Low-Dimensional Systems. Moscou, 2008 (2008, July)

We study targeted energy transfer (TET) [1] from a linear damped oscillator (LO) to a light attachment with essential stiffness nonlinearity, caused by 1:1 transient resonance capture (TRC). First, we ... [more ▼]

We study targeted energy transfer (TET) [1] from a linear damped oscillator (LO) to a light attachment with essential stiffness nonlinearity, caused by 1:1 transient resonance capture (TRC). First, we study the underlying Hamiltonian dynamics and show that for sufficiently weak damping, the nonlinear damped transitions of the system are strongly influenced by the underlying topological structure of periodic and quasiperiodic orbits of the hamiltonian system. Then, we formulate conditions that lead to effective or even optimal TET from the linear system to the nonlinear attachment. Direct analytical treatment of the governing strongly nonlinear damped equations of motion is performed by applying L. Manevitch’s complexification – averaging (CX-A) method [2] to perform slow-fast partition of the transient responses, and analytically model the dynamics in the region of optimal TET. This analysis determines the characteristic time scales of the dynamics that influence the capacity of the nonlinear attachment to passively absorb and locally dissipate broadband energy from the linear oscillator in an optimal fashion. [less ▲]

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See detailImpact of the spray drying conditions on inulin's physical properties
Ronkart, Sébastien; Blecker, Christophe ULg; Deroanne, Claude et al

Poster (2008, July)

Detailed reference viewed: 27 (8 ULg)
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See detailDetecting with PMUs the onset of voltage instability caused by a large disturbance
Glavic, Mevludin; Van Cutsem, Thierry ULg

(2008, July)

This paper deals with long-term voltage instability triggered by the outage of transmission or generation equipments. It is shown how the onset of voltage instability could be detected in real-time from ... [more ▼]

This paper deals with long-term voltage instability triggered by the outage of transmission or generation equipments. It is shown how the onset of voltage instability could be detected in real-time from post-disturbance bus voltages provided by Phasor Measurement Units (PMUs), assuming observability of the whole region prone to voltage instability. An extended set of equilibrium equations is fitted to the measurements and the change in sign of sensitivities is onitored. The latter are easily computed even for a large system. The important effects of overexcitation limiters and load tap changers are taken into account. The approach is illustrated on a 52-bus 20-machine system, where PMU outputs are simulated from detailed time simulation. [less ▲]

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See detailComposite joints in robust building frames
Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

(2008, July)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional actions. Accordingly, a European RFCS ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional actions. Accordingly, a European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines for the design of steel and composite structures under exceptional actions. In this project, the importance of the structural joints has been shown; as a particular case, these ones experience additional high tying forces after the loss of a column, as a result of the development of membrane forces in the beams located just above the damaged column. Moreover a reversal of moments occurs in some joints. In this paper design models for the evaluation of the mechanical properties of joints in such extreme situations are presented. References are made to recent tests on joints in isolation and joints in frames recently achieved at Stuttgart and at Liège University in the framework of the above-mentioned RFCS project. [less ▲]

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See detailUpstream migration of fish at natural obstructions and fish passes efficiency in Southern Belgium.
Ovidio, Michaël ULg; Orban, Patrice; Lambot, Francis et al

Conference (2008, July)

Fragmentation of rivers by physical obstacles has resulted in the drastic range reduction or extinction of numerous diadromous and potadromous species of fish worldwide. In order to implement to partially ... [more ▼]

Fragmentation of rivers by physical obstacles has resulted in the drastic range reduction or extinction of numerous diadromous and potadromous species of fish worldwide. In order to implement to partially or completely re-establish the free movements of fish in the entire watercourse, the Walloon regional government (Southern Belgium) initiated an integrated restoration project whose objectives are 1) To perform a complete inventory of all obstacles that may potentially interfere with the longitudinal connectivity and the free movements of fish, 2) To test, using radio telemetry, the ability of representative fish species (Salmonidae, Thymallidae, Cyprinidae, Esocidae and Cottidae) to clear different typologies of physical obstacles, 3) To determine the problematic sites that should be improved with priority. 4) To construct fish passage facilities and to examine their biological efficiencies. During our talk we will synthesize the results of ten years of research and define the different options for the future. [less ▲]

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See detailThe first geological maps of Belgium on the web
Anceau, Annick ULg; Nizet, Laurent ULg

Poster (2008, July)

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See detailAnalysis of liquid-flooded expansion using a scroll expander
Lemort, Vincent ULg; Bell, Ian; Groll, Eckhard et al

(2008, July)

This paper presents the development and the experimental validation of a model of a scroll expander integrated into a Liquid Flooded Ericsson Cooler (LFEC) as proposed by Hugenroth (2007). This system ... [more ▼]

This paper presents the development and the experimental validation of a model of a scroll expander integrated into a Liquid Flooded Ericsson Cooler (LFEC) as proposed by Hugenroth (2007). This system uses liquid flooding of the compressor and the expander to approach isothermal compression and expansion processes. A detailed model of the flooded scroll expander has been constructed which allows prediction of its performance over a wide range of operating conditions. This model is validated with experimental data collected on a prototype of a Liquid Flooded Ericsson Cooler. A parametric study is finally conducted for investigating the performances of the expander under different design changes, such as the shape of the tip of the scroll and the leakage gap size. [less ▲]

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See detailUsing survey data to resolve the exchange risk exposure puzzle
Muller, Aline ULg; Jongen, Ron; Verschoor, Willem

Conference (2008, June 30)

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See detailMerging academic libraries: An opportunity for a face-lift?
Durieux, Nancy ULg; Vandenput, Sandrina ULg; Brouwir, Christine ULg et al

Conference (2008, June 26)

Although the decision to merge libraries generates stress, it is also a great opportunity to start a global reflection on the functioning of libraries. In 2003, the University of Liège decided to create a ... [more ▼]

Although the decision to merge libraries generates stress, it is also a great opportunity to start a global reflection on the functioning of libraries. In 2003, the University of Liège decided to create a new physical and functional structure by combining the previously independent libraries of Medicine, Veterinary Medicine, Botany, Zoology, Psychology and Educational Sciences. The initial phase included a plan to remove the collections and standardise the academic teaching of IT literacy in the various disciplines. We now want to question our missions and evaluate our present working procedures in order to optimise our services, eventually develop new ones, and make them visible through a new website or any other types of support. The different populations of users need to be clearly identified, evaluated and anticipated. Staff competences must be evaluated to guarantee that users' expectations are met, and possibly to envisage any new services that may need to be created. In addition, staff competences must be improved through adapted education and tailored professional training. At the same time, the library involvement in academic teaching deserves to be properly highlighted. We are aware that there is not anything new in such an approach, but the pieces of evidence are scattered, outdated or not adapted to our present situation. As a consequence, we propose an overview of the literature concerning the marketing of academic libraries, conducted according to the principles of Evidence-Based Library and Information Practice. We shall select the most important publications providing strong theoretical support, and we shall collect existing tools, evaluation grids and procedure rules that might be useful during any step of the project. We shall organise them into a structured and pragmatic working strategy that could be used by any library interested in a marketing approach. It should integrate the different topics previously mentioned such as the library’s missions, the evaluation and optimisation of services, as well as the visibility of the teaching activities and the professional education programmes developed by academic libraries. [less ▲]

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See detailFair Trade Organisations in Europe: A Significant Field of Social Enterprise?
Huybrechts, Benjamin ULg

Conference (2008, June 26)

With the help of examples of FTOs in Belgium, France, Italy and the UK, we have applied some of the features of SE approaches to the context of FT. It appears that FTOs are particularly significant ... [more ▼]

With the help of examples of FTOs in Belgium, France, Italy and the UK, we have applied some of the features of SE approaches to the context of FT. It appears that FTOs are particularly significant examples of SEs, combining in different ways economic, social and sometimes political dimensions. From more NGO-like to more business-like configurations, all FTOs of our sample seem to respect the key features of SEs, under which the primacy of 23 the social mission, the limited (if any) profit distribution, the focus on innovation and at least some degree of self-financing. Nevertheless, there is some heterogeneity in terms of FTOs’ goals and activities. While all FTOs seem to combine, at least, economic and social dimensions – although at varying degrees and forms –, the political dimension is not present in the same way for all FTOs. Pioneer FTOs generally conduct education and advocacy activities in a developed and explicit way. Newcomer FTOs, however, have heterogeneous profiles in terms of political involvement, as the positioning seems to depend much on the entrepreneur’s choices. In terms of governance, practices are also very diverse in terms of leaders’ profiles, legal forms and stakeholders’ involvement in the decision-making structures. Some FTOs are quasi-individual ventures and are thus close to some American approaches of SE. Other FTOs are much more multi-stakeholder and fit better in the EMES conceptualisation of SE. The governance structure also seems to reflect to a certain extent the positioning of the FTO towards the different dimensions of FT. FTOs led by activists and having volunteers or partner NGOs on their Board seem to have a stronger focus on non-economic (social and political) goals. In the other sense, very economic-oriented FTOs are often run by managers with a business background and governed by their manager and/or their shareholders. As a conclusion, this article has tried to provide some theoretical and empirical support to the implicit link that has been established, both in the academic world and in the field practice, between FT and SE. The diversity of the FT sector echoes the rich diversity of SEs’ practices and conceptualisations. In such sense, considering FTOs as SEs is probably made easier because of the wide and flexible theoretical framework of SE – few authors claiming to have a “definition” of SE. If more restricted conceptions of SE were to emerge – e.g., the limitation of SE to formal Third Sector legal forms, or to 100% market financing –, then part of the FTOs would be excluded from the SE area. In such sense, FT appears as an important laboratory the evolutions of which can feed the theoretical construction of SE. [less ▲]

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See detailLe modèle belge de concertation budgétaire
Husson, Jean-François ULg

Conference (2008, June 25)

Cette présentation aborde l'historique de la coordination budgétaire en Belgique depuis le début des années 1990. Elle s'attarde plus particulièrement sur les institutions de coordination (Comité de ... [more ▼]

Cette présentation aborde l'historique de la coordination budgétaire en Belgique depuis le début des années 1990. Elle s'attarde plus particulièrement sur les institutions de coordination (Comité de consertation, Conseil supérieur des Finances,...) et les divers instruments de régulation utilisés. [less ▲]

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See detailDevelopment of a simplified Building-HVAC System model with the help of an equation solver
Bertagnolio, Stéphane ULg; Lemort, Vincent ULg; Lebrun, Jean ULg

Conference (2008, June 25)

This seminar shows how modeling and simulation environments that are built using equation-based solvers can benefit the building energy community. Such modeling and simulation environments separate the ... [more ▼]

This seminar shows how modeling and simulation environments that are built using equation-based solvers can benefit the building energy community. Such modeling and simulation environments separate the formulation of a model’s underlying physics from its numerical solution algorithms. This allows input-output free modeling, it leads to faster model development time and it facilitates model reuse for different applications. Equation-based modeling and simulation environments are frequently used in various industrial sectors. For building energy simulation, however, they have not yet enjoyed wide-spread use. This seminar encourages discussions to understand their applicability, advantages and limitations for the building energy community. [less ▲]

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See detailNew pH-sensitive flower micelles for drug delivery systems
Cajot, Sébastien ULg; Van Butsele, Kathy; Jérôme, Christine ULg

Poster (2008, June 23)

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See detailElectrospinning of biocompatible polymers for potential biomdical applications
Croisier, Florence ULg; Zalfen, Alina; Aqil, Abdelhafid ULg et al

Poster (2008, June 23)

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See detailRobustness of structures - behaviour of composite joints
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Sixth International Workshop on Connections in Steel Structures (2008, June 23)

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading. Accordingly, a European RFCS ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional loading. Accordingly, a European RFCS project entitled “Robust structures by joint ductility” has been set up in 2004, for three years, with the aim to provide requirements and practical guidelines to ensure the structural integrity of steel and composite structures under exceptional loading through an appropriate robustness. In this project, the importance of the structural joints has been shown; indeed, these ones experience additional high tying forces after the loss of a column, as a result of the development of membrane forces in the beams located just above the damaged column. Moreover a reversal of moments occurs in some joints. In this paper design models for the evaluation of the mechanical properties of joints in such extreme situations are presented. References are made to recent tests on joints in isolation recently achieved in the framework of the above-mentioned RFCS project. [less ▲]

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See detailToward protein and cell repellent properties by surface modification of intraocular lenses
Bozukova, Dimitriya; Pagnoulle, Christophe; De Pauw-Gillet, Marie-Claire ULg et al

Poster (2008, June 23)

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See detailManufacturing and verification of ZnS and Ge prisms for the JWST MIRI imager
Rossi, Laurence ULg; Renotte, Etienne ULg; Plesseria, Jean-Yves ULg et al

in Proceedings of SPIE (2008, June 23), 7018

The JWST Mid-Infrared Instrument (MIRI) is designed to meet the JWST science requirements for mid-IR capabilities and includes an Imager MIRIM provided by CEA (France). A double-prism assembly (DPA ... [more ▼]

The JWST Mid-Infrared Instrument (MIRI) is designed to meet the JWST science requirements for mid-IR capabilities and includes an Imager MIRIM provided by CEA (France). A double-prism assembly (DPA) allows MIRIM to perform low-resolution spectroscopy. The MIRIM DPA shall meet a number of challenging requirements in terms of optical and mechanical constraints, especially severe optical tolerances, limited envelope and very high vibration loads. <br />The University of Cologne (Germany) and the Centre Spatial de Liege (Belgium) are responsible for design, manufacturing, integration, and testing of the prism assembly. A companion paper (Fischer et al. 2008) is presenting the science drivers and mechanical design of the DPA, while this paper is focusing on optical manufacturing and overall verification processes. <br />The first part of this paper describes the manufacturing of Zinc-sulphide and Germanium prisms and techniques to ensure an accurate positioning of the prisms in their holder. (1) The delicate manufacturing of Ge and ZnS materials and (2) the severe specifications on the bearing and optical surfaces flatness and the tolerance on the prism optical angles make this process innovating. The specifications verification is carried out using mechanical and optical measurements; the implemented techniques are described in this paper. <br />The second part concerns the qualification program of the double-prism assembly, including the prisms, the holder and the prisms anti-reflective coatings qualification. Both predictions and actual test results are shown. [less ▲]

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See detailSystems Theory in Systems Biology
Bullinger, Eric ULg

Conference (2008, June 20)

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See detailThe Driver Model of the traffic flow simulation PELOPS – modelling and application possibilities
Christen, Fréderic ULg; Huang, Q.

in 2nd Berlin Expert Conference on Driver Modelling “Driver Modelling in Science and Economy” (2008, June 20)

In diesem Beitrag wird zunächst das Verkehrssimulationsprogramms PELOPS vorgestellt. Dabei wird detailliert auf das in PELOPS enthaltene Fahrermodell eingegangen. Das Modell ist in der Lage, sowohl ... [more ▼]

In diesem Beitrag wird zunächst das Verkehrssimulationsprogramms PELOPS vorgestellt. Dabei wird detailliert auf das in PELOPS enthaltene Fahrermodell eingegangen. Das Modell ist in der Lage, sowohl einspuriges Folgeverhalten, als auch das Fahrverhalten beispielsweise bei Spurwechselmanövern realistisch abzubilden. Nach der Beschreibung des Modells wird die Methodik zur Entwicklung und Implementierung neuer Fahrermodellfunktionen erläutert. Hierbei werden die Vor- und Nachteile bei der Erfassung des Fahrerverhaltens anhand von Induktionsschleifen, Videodektionsanlagen, Fahrsimulatoren oder Messfahrzeugen beschrie- ben. Abschließend umreißt der Beitrag zwei Applikationsmöglichkeiten des Fahrermodells: Zum einen den Einsatz des Fahrermodells im Fahrsimulator und zum anderen die Integration des Fahrermodells als Reglers im Fahrzeug. [less ▲]

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See detailRenal failure and ICU-acquired infection
MICHIELS, Grégoire; WIESEN, Patricia ULg; LAYIOS, Nathalie ULg et al

Conference (2008, June 20)

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See detailReproducible Testing of Distributed Software with Middleware Virtualization and Simulation
Briquet, Cyril ULg; de Marneffe, Pierre-Arnoul ULg

in Ur, Shmuel (Ed.) Proceedings of the 6th Workshop on Parallel And Distributed systems: Testing, Analysis, and Debugging (2008, June 20)

P2P Grids are Grids organized into P2P networks where participant exchange computing time so as to complete computational tasks. Evaluating the performance of scheduling algorithms enables one to deploy ... [more ▼]

P2P Grids are Grids organized into P2P networks where participant exchange computing time so as to complete computational tasks. Evaluating the performance of scheduling algorithms enables one to deploy those that are efficient. Performance is often evaluated experimentally or through simulation because these algorithms (typically heuristics) are too complex to model analytically. Testing the implementation of P2P Grid middleware before it is deployed is also important: Reproducing configurations or conditions that lead to unexpected outcomes is thus valuable. A P2P Grid environment exhibits multiple sources of failure and is typically dynamic and uncontrollable. Reproducing even basic behavior of Grid nodes in a controllable and repeatable manner is thus exceedingly difficult. Such lack of control over the environment is a major challenge in the software engineering of P2P Grid middleware. Simulators have been proposed to evaluate the performance of scheduling algorithms, but are often limited in scope, reusability and accuracy, i.e. they rely on simplified models. We introduce a software engineering pattern - that we call code once, deploy twice - to both reduce the distance between simulated and implemented algorithms and reproduce, at will, Grid configurations and environments: A simulator implementation of a Grid architecture is built by virtualizing its middleware implementation. An immediate benefit is that most of the code can be reused between both implementations; only communications between Grid nodes, multithreading within Grid nodes and actual task execution are coded differently. As a derived benefit, most of the code of the middleware can be tested within the controlled environment of the simulator, before it is deployed as-is. Another benefit is high simulation accuracy. We describe the implementation of a P2P Grid following the code once, deploy twice pattern, that we believe is also relevant to other Grid types (certainly Volunteer Grids and Desktop Grids, and possibly Globus-based Grids). [less ▲]

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See detailYouth Political Interest, Political Participation, and Civic Education in French-speaking Belgium
Fournier, Bernard ULg; Reuchamps, Min ULg

Conference (2008, June 18)

In spring 2007, we administered a survey to 1437 high school students (16-18 years old) in order to measure their political interest and participation as well as to assess their political knowledge ... [more ▼]

In spring 2007, we administered a survey to 1437 high school students (16-18 years old) in order to measure their political interest and participation as well as to assess their political knowledge. Relying on the results of some of the 150 questions, in this paper, we argue that uncovering the relationship between political interest, knowledge, and participation is a prerequisite for insightful and further research on civic education. So doing, we shall move our analysis beyond the usual sociological categories in order to stress differences between “clusters of students”. As such, we privilege the analysis in terms of classifications. With a more precise image of the various forms of youth’s political attitudes, different patterns will characterise young people’s opinions and behaviours. Accordingly, our understanding of the mechanisms of political socialisation will be adapted. Such an inquiry seems necessary in order to engage the traditional views on political participation and interest of today’s youth as well as the impact of civic education, for which further research, both quantitative and qualitative, is needed. [less ▲]

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See detailCoupled vs uncoupled approaches for sediment transport modelling
Dewals, Benjamin ULg

Conference (2008, June 18)

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See detailSur le concept de "valeur pure" chez Ferdinand de Saussure
Sofia, Estanislao ULg

Conference (2008, June 17)

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See detailAyahuasca et Iboga: secte et néo-chamanisme
Collart, Anne-Françoise ULg

Conference (2008, June 17)

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See detailPotential Estimation of Minerals Content in Cow Milk Using Mid-Infrared Spectrometry
Soyeurt, Hélène ULg; Bruwier, Damien; Gengler, Nicolas ULg et al

in ICAR Proceedings of the Biennial Sessions (2008, June 16)

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See detailIntravenous lidocaine reduces propofol requirement during propofol - remifentanil anaesthesia for thyroid surgery
Charlier, Vanessa ULg; Lauwick, Séverine ULg; Hans, Grégory ULg et al

in Acta Anaesthesiologica Belgica (2008, June 14), 59(3), 204

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See detailEffect of Clonidine on Propofol and Remifentanil requirements using BIS score and the A-line ARX (AAI) index during laparoscopic gastric bypass in obese patients
Rosant, Séverine; Nkiko, Gédéon; Lauwick, Séverine ULg et al

in Acta Anaesthesiologica Belgica (2008, June 14), 59(3), 228

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See detailEffect of intravenous lidocaine on the depth of propofol anesthesia assessed by the bispectral index (BIS)
Delangh, Virginie; Hans, Grégory ULg; Kaba, Abdourahmane ULg et al

in Acta Anaesthesiologica Belgica (2008, June 14), 59(3), 206

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See detailDo monitoring and counselling boost the job finding rates of the long-term unemployed ?
Fonder, Muriel; Lejeune, Bernard ULg

Conference (2008, June 13)

In July 2004, the Belgian government launched a new monitoring and counselling program targeted at the long-term unemployed. In this new program, people over 13 months unemployment are warned that their ... [more ▼]

In July 2004, the Belgian government launched a new monitoring and counselling program targeted at the long-term unemployed. In this new program, people over 13 months unemployment are warned that their job-search efforts will be monitored 8 months later. At the same time, they are invited to participate actively in the support (job search, training) programs provided for by the Regional Employment Agencies, whose supply was expanded. This reform has been implemented gradually : it focused the unemployed under 30 years in 2004, then the 30-40 year-old unemployed in 2005, and finally the 40-50 year-old unemployed in 2006. This paper aims at evaluate the effect, in terms of transition from unemployment to employment and/or training, of this new program for the 30-40 years old in Wallonia. Using the fact that the reform was implemented gradually, the effect of the program is estimated by difference-in-differences, based on (single exit and two exits) discrete duration models. The results suggest that the program has had a very large relative effect, although limited in absolute terms, regarding transition to training for almost all the treated unemployed. They also show that the program has had a substantial relative effect, although limited in absolute terms as well, with regard to transition to employment for the majority of the treated unemployed. [less ▲]

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See detailPhilosophie et modalités de la justice réparatrice.
Lauwaert, Katrien ULg

Conference (2008, June 13)

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See detailRoundtable on DRC and the EU'S role
Kabamba, Bob ULg

Conference (2008, June 12)

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See detailIS EPIZOOTIC RABBIT ENTEROPATHY (ERE) A BACTERIAL DISEASE?
Huybens, Nathalie ULg; Houeix, Julien ULg; Szalo, Ioan Mihai ULg et al

in Proceeding of the 9th World Rabbit Congress (2008, June 12)

The etiology of epizootic rabbit enteropathy (ERE) is still unknown despite ten years of continuous research. A putative bacterial etiology is at the basis of current research. The fractionation of the ... [more ▼]

The etiology of epizootic rabbit enteropathy (ERE) is still unknown despite ten years of continuous research. A putative bacterial etiology is at the basis of current research. The fractionation of the reference inoculum (TEC4) is a major step to find the potential bacterial agent(s). In this study, TEC4 was fractionated with two techniques: centrifugation on discontinuous sucrose gradient then cell adhesion. Two selected fractions were inoculated to SPF rabbits and analyzed with classical bacteriological techniques. ERE was reproduced with both fractions. The 16S rDNA gene was amplified in all fractions and in three negative controls and subsequently analyzed with Restriction Fragment Length Polymorphism (RFLP) and Denaturating Gradient Gel Electrophoresis (DGGE). A difference in bacterial DNA composition was found between virulent and non-virulent fractions which reinforce the potential role of bacteria in the etiology of ERE. [less ▲]

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See detailShort-term post-dispersal fate of seeds primarily dispersed by tamarins
Culot, Laurence ULg

Conference (2008, June 09)

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See detailThe arylthiadiazine 1,1-dioxides in medicinal chemistry
De Tullio, Pascal ULg

Conference (2008, June 08)

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See detailAnalyse des curriculums officiels et implantés dans les pays de la Confemen
Lejong, Michèle ULg

Conference (2008, June 07)

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See detailA new tracer technique for monitoring groundwater fluxes : the finite volume point dilution method
Brouyère, Serge ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

Conference (2008, June 06)

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See detailFormes et enjeux de la décentralisation théâtrale en Belgique francophone
Delhalle, Nancy ULg

Conference (2008, June 06)

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See detailLe positionnement des organisations de commerce équitable entre l’économique, le social et le politique : essai de typologie et illustrations en Belgique, en France et au Royaume-Uni
Huybrechts, Benjamin ULg

Conference (2008, June 05)

Parallèlement à la croissance exponentielle de ses ventes et de sa notoriété, le mouvement du commerce équitable (CE) connaît une diversification croissante de son paysage organisationnel (Nicholls & Opal ... [more ▼]

Parallèlement à la croissance exponentielle de ses ventes et de sa notoriété, le mouvement du commerce équitable (CE) connaît une diversification croissante de son paysage organisationnel (Nicholls & Opal, 2005; Wilkinson, 2007). Alors qu’à ses débuts, le mouvement était porté par des organisations militantes relativement homogènes, celles-ci se sont progressivement diversifiées, tandis que de nouveaux acteurs sont apparus avec une dynamique commerciale plus marquée (Gendron, 2004; Moore, 2004; Renard, 2003). Si toutes les organisations de commerce équitable (OCE) ont en commun de chercher à soutenir des organisations de producteurs au Sud à travers une activité commerciale « équitable » dans le cadre d'un développement durable Nord-Sud, les stratégies adoptées peuvent fortement différer (Wilkinson, 2007). Ainsi, en caricaturant quelque peu, certaines OCE misent principalement sur le partenariat commercial, encadré par un processus de labellisation, et prônent un développement essentiellement quantitatif de la filière, notamment à travers la distribution des produits en grandes surfaces. D'autres, par contre, insistent plus sur la qualité des partenariats avec les producteurs marginalisés et misent sur les activités de sensibilisation des citoyens et de lobbying auprès des pouvoirs publics dans le but de modifier en profondeur les règles du commerce international. Quelle que soit leur stratégie, les OCE sont inévitablement confrontées aux tensions traversant l’ensemble du mouvement équitable. Ces tensions semblent pouvoir se résumer, globalement et malgré certaines nuances dans les appellations, à deux grands pôles : le pôle économique, de « marché » d’une part, et le pôle socio-politique, de « solidarité » d’autre part. Ce qui différencie les OCE, c’est donc la manière de gérer cette tension et de se positionner par rapport à ces différentes logiques. L’objectif de cette contribution est précisément d’éclairer ces différents positionnements organisationnels sur le « continuum » entre l’économique et le socio-politique. Nous commençons par présenter ce continuum du CE sur lequel les acteurs se positionnent. Nous proposons ensuite différents indicateurs organisationnels susceptibles d'appréhender ces positionnements. A partir de la théorie des organisations appliquée à différentes formes organisationnelles, nous nous penchons sur les objectifs organisationnels, les ressources, le statut juridique et la composition des éventuelles instances de gouvernance (principalement l'assemblée générale et le conseil d'administration). Nous rappelons dans quelle mesure, selon la littérature, ces indicateurs peuvent être révélateurs du positionnement stratégique de l'organisation. Ensuite, nous proposons quatre profils organisationnels possibles pour gérer les tensions entre les différents pôles du CE. Chacun de ces profils est caractérisé par rapport aux indicateurs organisationnels proposés : objectifs déclarés, types de ressources mobilisées (ventes, dons, subventions, bénévolat), statut juridique (association, coopérative, entreprise individuelle, société anonyme,...) et composition des instances de gouvernance (types de parties prenantes impliquées). Chaque profil est ensuite illustré par des exemples d'organisations provenant de trois études de terrain réalisées auprès d’OCE en Belgique, en France (dans la région Rhône-Alpes) et au Royaume-Uni. Enfin, après une synthèse de ces quatre profils, nous nous penchons sur leurs implications sur l’avenir du mouvement équitable. Nous cherchons à percevoir l'évolution des stratégies de positionnement des OCE de manière à distinguer les perspectives futures de la filière. La question posée est de savoir si les différents profils de positionnement peuvent continuer à coexister de manière complémentaire ou si, au contraire, ils mènent à l'apparition de différentes formes de CE n'ayant plus en commun que leur appellation. [less ▲]

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See detailDividends and Foreign Performance Signaling
Muller, Aline ULg; Joliet, Robert

Conference (2008, June 04)

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See detailDevelopment of a decision-making tool to manage forest storm damage in the Walloon Region (Belgium)
Riguelle, Simon ULg; Jourez, Benoît ULg; Hebert, Jacques ULg

Poster (2008, June 03)

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the ... [more ▼]

When an unexpected windthrow event occurs, the extent of damage may rapidly increase to reach a crisis level. Therefore, it requires a suitable and fast reaction by the public authorities and the concerned owners as well as by the whole sector of wood transformation. The aim of this research, which is a regional priority, relates to the realization of a decision-making tool thought not under the constraint of the urgency, when trees are lying down on the ground, but established on the basis of real dramatic cases already experienced in the past. The tool is dedicated to political and administrative services but, to be effective, calls upon a broad collaboration with all the partners of the wood sector. [less ▲]

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See detailIR and UV spectroscopic signatures of DNA higher-order structures in the gas phase
Gabelica, Valérie ULg; Rosu, Frédéric ULg; Gregoire, Gilles et al

Conference (2008, June 03)

Introduction Electrospray mass spectrometry (ESI-MS) can be used to transfer large biomolecular complexes from the solution to the gas phase. However, a longstanding question is whether the gas-phase ... [more ▼]

Introduction Electrospray mass spectrometry (ESI-MS) can be used to transfer large biomolecular complexes from the solution to the gas phase. However, a longstanding question is whether the gas-phase multiply-charged ions produced by ESI-MS keep a folded conformation in the absence of solvent. Nucleic acid secondary structures are determined by hydrogen bonding interactions between nucleic bases and by stacking interactions between neighboring base pairs. Here we will show that infrared (IR) and ultraviolet (UV) action spectroscopies provide useful and complementary information on the structure of nucleic acid ions in the gas phase. Methods IR spectroscopy experiments on DNA negative ions were carried out at the CLIO free electron laser (FEL) center (Orsay, France) using an Esquire 3000 (Bruker) mass spectrometer modified to inject the IR beam through the ring electrode. IRMPD spectra are recorded by monitoring the fragmentation of mass-selected parent ions as a function of the excitation wavenumber, in the range 1000-2000 cm-1. UV spectroscopy experiments were carried out using a tunable OPO laser (Continuum Lasers) with frequency doubling. The laser is interfaced with either a Finnigan LCQ ESI-QIT mass spectrometer or a Bruker Apex-Qe 9.4 T ESI-FTICR mass spectrometer. The UV action spectra were recorded by monitoring electron detachment as a function of the wavelength between 220 and 300 nm. Preliminary results First, DNA oligonucleotide ions forming G-quadruplex structures were studied in the gas phase using IR multiple-photon dissociation spectroscopy. Data interpretation on these large biomolecule ions is made using carefully chosen control experiments. The IR spectrum of the (dTG4T)4 quadruplex has been recorded, and compared to that of the single strand. Given the strand stoichiometry and the selective incorporation of three ammonium cations, there is little doubt about the quadruplex structure of [(dTG4T)4•(NH4+)3]5-. The major finding is a fingerprint of hydrogen bonding in the gas phase in the guanine C6=O6 stretching mode, that allows probing the conservation of G-quartets in the gas phase. Further experiments also demonstrate the conservation of G-quadruplex hydrogen bonds in the human telomeric sequence d(TTAGGG)4 [Gabelica et al., JACS, accepted]. Second, we also studied DNA duplexes and G-quadruplex ions in the gas phase by UV spectroscopy. We recorded the UV spectra of the (dTG4T)4 quadruplex, with and without ammonium ions. Molecular modeling [Rueda et al., JACS, 2006, p3608] and ion mobility spectrometry data [Gabelica et al., JACS, 2007, 895] showed that G-quadruplexes keep their hydrogen-bonded structure but become more floppy if inner cations are removed. We found that the UV spectra differ dramatically with and without inner cations, suggesting that UV spectroscopy is very sensitive to stacking interactions between neighboring G-quartets. We also used UV spectroscopy to probe the structure of 12-mer DNA duplexes, by comparing the duplex spectra to those obtained on single strands. Preliminary results show that stacking interactions may be preserved in duplexes containing GC base pairs, but not in duplexes containing AT base pairs. Altogether, these results show the complementarities between IR and UV spectroscopy to characterize DNA structures in the gas phase: IR data mainly give access to information on hydrogen bonding of bases, and UV spectroscopy provides information on stacking interactions. [less ▲]

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See detailClimatology and circulation of the Azores-Canary region by Data-Interpolation Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Poster (2008, June 02)

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See detailTable-ronde finale du colloque
Halleux, Jean-Marie ULg

Conference (2008, June 02)

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See detailSupercritical carbon dioxide, a tool for the dispersion ROP of lactone and PCL foaming: Part A
Grignard, Bruno ULg; Urbanczyk, Laetitia ULg; Stassin, Fabrice et al

Poster (2008, June 02)

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL ... [more ▼]

Aliphatic polyesters, namely polylactide (PLA) and poly-ε-caprolactone (PCL) are biodegradable and biocompatible materials that find applications as resorbable suture (PLA) and drugs delivery vectors (PCL). Nevertheless, these polymers were mainly prepared by ring opening polymerization using aluminum alkoxide or tin alkoxide initiators in organic media. Recently, the use of supercritical carbon dioxide as polymerization medium was proposed as a potential alternative to the use toxic organic solvents. Nevertheless, due to the non-solubility of PCL in this medium, the growing chains rapidly precipitate during their synthesis leading to the formation of a bulky material that is typical of a precipitation polymerization. This work aims at investigating the dispersion ring-opening polymerization (ROP) of ε-caprolactone in the presence of fluoropolymer-based stabilizers, that were prepared by combining the ring opening polymerization of ε-caprolactone and atom transfer radical polymerization of heptadecafluorodecylacrylate (AC8) and so, stabilizing PCL micrometric particles in supercritical carbon dioxide. In practice, the ROP of CL was initiated by dibutyltin dimethoxide in the presence of PCL-b-PAC8 diblock stabilizers of differents molecular weight and composition. After 24h at 40°C, PCL was collected as a powder that consists of small-sized microspheres. Finally, post-polymerization purification of PCL (removal of tin catalyst that may lead to toxicological problems) was demonstrated to be quite feasible by supercritical fluid extraction (SFE) leading to the preparation of PCL with low catalytic residues. The second goal of this work aims at reporting on the use of sc CO2 for the preparation of foams of poly(epsilon-caprolactone) (PCL), that could be useful in the packaging sector and/or the biomedical sector as potential scaffolds for tissue engineering but also as substitutes for polystyrene thermoformed trays. The method that consists of saturating a polymer with a compressed or supercritical fluid, such as carbon dioxide followed by depressurization and polymer expansion was investigated. Indeed, no residual product is left in the foam, no toxic gas is produced and no resort to hydrocarbon solvents is required. Moreover, CO2 is cheap, non-toxic, recyclable, non-flammable and the technology of CO2-assisted foaming can be used in either a batch mode or in a continuous mode within a high-pressure extruder. [less ▲]

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See detailConceptualiser des actions professionnelles vécues, une compétence travaillée avec les futurs formateurs d’enseignants.
Beckers, Jacqueline ULg; Van der Linden, Sylvie ULg

Conference (2008, June 02)

Cette communication se focalisera sur la préparation au métier de formateur d’enseignants organisée notamment dans le cadre d’un module intitulé « Didactique Professionnelle et Formation Initiale des ... [more ▼]

Cette communication se focalisera sur la préparation au métier de formateur d’enseignants organisée notamment dans le cadre d’un module intitulé « Didactique Professionnelle et Formation Initiale des enseignants » du master en Sciences de l’Education de l’université de Liège (ULg – Belgique). La première partie de ce module privilégie le développement chez les futurs formateurs d’une compétence clé à nos yeux : « Accompagner chaque futur enseignant dans la conceptualisation et la régulation de son activité professionnelle ». Cette compétence est à la fois travaillée sur le terrain (cette année, en classes maternelles) et à l’ULg. Certaines séances de cours dispensées aux futurs formateurs les mettent face à des tâches complexes, proches de celles qu’ils auront à gérer pendant les accompagnements. Elles sont amorcées par des mises en situations ou par des récits exemplaires de pratiques récoltés auprès de formateurs d’enseignants chevronnés. D’autres séances de cours sont destinées à garantir des ressources conceptuelles (didactique professionnelle, utilisation délibérative et non applicationniste de la théorie, caractéristiques du métier enseignant, développement des compétences professionnelles, construction identitaire, …) et techniques (entretien d’explicitation, utilisation des ressources pédagogiques sur Internet, construction d’outils d’observation, utilisation de la caméra, …) à mobiliser dans les tâches complexes puis sur le terrain. Pendant l’accompagnement, l’exploitation par les futurs formateurs de traces (données d’observation, enregistrements vidéos et audios) soutient des entretiens de régulation individualisés et une séance d’analyse de pratiques en petits groupes. Quand un observable soutient la réflexion, on peut faire l’hypothèse qu’il favorise la conceptualisation voire même le changement du cadre interprétatif, particulièrement quand le groupe des pairs introduit des perceptions différentes, des significations autres et suggère des pistes d’actions alternatives. [less ▲]

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See detailVorticity balance in the Northwestern African Upwelling
Troupin, Charles ULg; Mason, Evan; Sangrà, Pablo

Conference (2008, June 02)

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See detailAccompagner le développement du regard réflexif chez de futures institutrices préscolaires par la prise en compte de la diversité de leurs parcours, une compétence du formateur d’enseignants.
Van der Linden, Sylvie ULg

Conference (2008, June 02)

Pour instruire et éduquer leurs élèves, les enseignants mobilisent diverses compétences, résumées en « 13 compétences essentielles du métier » dans le décret réformant la Formation initiale des ... [more ▼]

Pour instruire et éduquer leurs élèves, les enseignants mobilisent diverses compétences, résumées en « 13 compétences essentielles du métier » dans le décret réformant la Formation initiale des enseignants préscolaires, primaires et du début du secondaire en Communauté Française de Belgique (décembre 2000). Les compétences que les formateurs des futurs enseignants cités mobilisent pour les accompagner dans le développement des compétences professionnelles et la construction identitaire, sont quant à elles résumées en « 14 compétences essentielles de ce deuxième métier » au sein du décret définissant le certificat d'aptitude pédagogique approprié à l'enseignement supérieur (juillet 2002). Cette communication se focaliserait sur le développement de la compétence porter un regard réflexif sur sa pratique pour développer chez des futurs enseignants préscolaires de première année de formation la capacité de réguler leur propre action et de se projeter dans le métier. En parallèle, le développement de la compétence promouvoir la réussite des étudiants notamment par la prise en compte de la diversité des parcours auprès de leur professeur de pédagogie sera décrit et analysé. [less ▲]

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See detailMagnetic Massive Stars
Townsend, Rich; Cohen, David H; Dessart, Luc et al

in IAU Symposium (2008, June 01)

Magnetic fields are unexpected in massive stars, due to the absence of a sub-surface convective dynamo. However, advances in instrumentation over the past three decades have led to their detection in a ... [more ▼]

Magnetic fields are unexpected in massive stars, due to the absence of a sub-surface convective dynamo. However, advances in instrumentation over the past three decades have led to their detection in a small but growing subset of these stars. Moreover, complementary theoretical developments have highlighted their potentially significant influence over the structure, evolution and circumstellar environments of massive stars. Here, we summarize a special session convened prior to the main conference, focused on presenting recent developments in the study of massive-star magnetic fields. [less ▲]

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See detailEuroPlaNet: Improving the Communication on Planetary Sciences
Nazé, Yaël ULg; Heward, A.

in EPO and a Changing World: Creating Linkages and Expanding Partnerships (2008, June 01)

EuroPlaNet is an EC-funded consortium. It coordinates the activities of European researchers working in planetary sciences but it is not only aimed at pure scientific activities. Its outreach action ... [more ▼]

EuroPlaNet is an EC-funded consortium. It coordinates the activities of European researchers working in planetary sciences but it is not only aimed at pure scientific activities. Its outreach action involves a networking of the members, in order to promote the planetary sciences in Europe, improve the public awareness of the major European achievements & projects, and stimulate the use of planetary sciences for the promotion of scientific education and culture at large. For more information: \url{http://www.europlanet-eu.org/} or \url{http://www.europlanet.cesr.fr/}. [less ▲]

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See detailEffects of a single 5 mg infusion of zoledronic acid and oral risedronate (5 mg/day) on bone remodeling over one year in patients with glucocorticoid-induced osteoporosis
Saag, K. G.; Devogelaer, Jean-Pierre; Reid, D. M. et al

in Annals of the Rheumatic Diseases (2008, June), 67(Suppl.II), 542

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See detailDistribution of serotypes of clinical group B streptococci isolated in Belgium: a decade review
MELIN, Pierrette ULg; De Mol, Patrick ULg

in LISSSD Board (Ed.) Abstract book (2008, June)

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