References of "Scientific congresses and symposiums"
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See detailOPEN-LOOP STABILIZATION OF 2D IMPACT JUGGLING
Ronsse, Renaud; Lefèvre, Philippe; Sepulchre, Rodolphe ULg

in Proceedings of 6th IFAC Symposium on Nonlinear Control Systems (2004, September)

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become ... [more ▼]

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2D impact juggling. It is shown that some periodic orbits that are unstable in the elastic xed wedge become exponentially stable in the (non-)elastic vibrating wedge. These orbits are linked with some classical juggling patterns, providing an interesting benchmark for the study of the frequency-locking properties in human rhythmic tasks. [less ▲]

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See detailPractical case of HACCP methodology used for Staphylococcus aureus groth control in raw milk "fromage frais".
Broze, Olivier; Defrize, Nathalie; Sindic, Marianne ULg et al

in Proceedings of the Ninth conference on food microbiology (2004, September)

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See detailControl of Listeria monocytogenes in dairy farms.
Di Tanna, Sybille ULg; Belleflamme, Christel ULg; Anceau, Christine ULg et al

in Proceedings of the Ninth conference on food microbiology (2004, September)

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See detailWhole-body barometric plethysmography in healthy dogs: effect of sedation on basal respiratory variables and during histamine challenge
Talavera, J.; Kirschvink, N.; Clercx, Cécile ULg

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailTaxonomical study of lactic acid-producing spore-forming bacteria isolated from soil.
Bayane, A.; Diawara, B.; Roblain, D. et al

Poster (2004, September)

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See detailAn error decomposition method: Application to mediterranean sst simulations assessment
Ben Bouallegue, Z.; Alvera Azcarate, Aïda ULg; Beckers, Jean-Marie ULg

Conference (2004, September)

Fields composed of daily simulations provided by an OGCM of the Mediterranean Sea are compared to weekly satellite observations. The method used is inspired of the object-oriented verification procedure ... [more ▼]

Fields composed of daily simulations provided by an OGCM of the Mediterranean Sea are compared to weekly satellite observations. The method used is inspired of the object-oriented verification procedure introduced in meteorological forecast assessment by Ebert and al. 2000. The Error Decomposition Method presented here aims to identify error sources. The method is carried out within the framework of the MFSTEP hindcasts. The MFSTEP project is an international scientific collaboration program which aims to create an operational forecasting system for the Mediterranean Sea. The simulations provided at the basin scale are 10 days forecasting fields in a 3-D ocean. The hydrodynamic model primitive equations are combined with the data assimilation scheme SOFA applied every week. The set of data used for the comparison are weekly SST satellite observations and means of seven daily MFSTEP simulations (analyzed fields) for the equivalent weeks. The original simulation is transformed until the total squared difference between the observed and hindcast fields is minimized. Successively, a new combination of seven consecutive daily simulations is produced, the new SST field is displaced horizontally and the bias suppressed. This allows a decomposition of the total error in 4 parts: a temporal shift error, a position error, an intensity error and a pattern error. This last element is the remaining error after simulation field transformation and corresponds to the unexplained error. The method is applied at different restricted areas of the Mediterranean basin. The predominant displacements in time and in space minimizing error are discussed through the physical processes taking places at each location. More over, ratio between the different error components is analysed in term of scale effect: the role of the application domain size is pointed out. Finally, the seasonal impact on the different results is commented. [less ▲]

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See detailDevelopment of functional material for direct manufacturing for ceramic and metal parts by Optoform process
Clarinval, Anne-Marie; Carrus, Raoul; Vaneetveld, Grégory ULg et al

Conference (2004, September)

Optoform LLC developed a technology to process paste compositions based upon photo-curable resins and fillers. This new process is called by Optoform LLC : the direct composite manufacturing This ... [more ▼]

Optoform LLC developed a technology to process paste compositions based upon photo-curable resins and fillers. This new process is called by Optoform LLC : the direct composite manufacturing This technique is quite flexible and allows the development of very different materials(polymeric, metallic, ceramic). This paper is an overview of the use limitation and the advantages of materials developed by the CRIF or by other teams. Materials requiring or not a post-processing step have been developed. The limits or restrictions of use of these materials have been studied in order to meet the requirements and needs of various industrial sectors in the United States and in Europe (e.g. car racing, aerospace and aeronautical sectors, tooling industries, …). [less ▲]

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See detailLong term outcome in dogs with sinonasal aspergillosis treated with intranasal infusion of enilconazole
Schuller, S.; Clercx, Cécile ULg

in 14th ESVIM Meeting - Barcelona - Espagne (2004, September)

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See detailEcologie de la loutre (Lutra lutra) et conservation de ses habitats riverains
Libois, Roland ULg

in Actes du 1er colloque international "gestion et préservation des ressoures en eau" (2004, September)

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See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

in CD-ROM of full texts of the 16th International Congress of Chemical and Process Engineering, CHISA (Paper A7.2, 11 p.) (2004, August 22)

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See detailPlasma composition in the Jovian magnetosphere
Radioti, Aikaterini ULg; Krupp, N.; Woch, J. et al

Poster (2004, August 03)

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See detailFocii determination of an off axis ellipsoid : Theory to practice
Houbrechts, Yvette ULg; Roose, Stéphane ULg; Stockman, Yvan ULg

in Osten, W.; Novak, E. (Eds.) Proceedings of the Eighth International Conference on Laser and Laser Information Technologies (2004, August 02)

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was ... [more ▼]

In the frame of cryogenic test on an off axis ellipsoid, it has been required to set-up an unambiguous method to determine and track the foci position during temperature transitions. This procedure was mandatory to avoid: (1) impact of the operator skills working on triple shift scheme to assure continuously monitoring of the ellipsoid shape during cool down. (2) correctly dissociate the impact of the thermal deformation on the mirror shape with respect to alignment errors. This paper will demonstrate the process, starting from ideal ellipsoid shape, then introducing 3D metrology data in a model, and finally presents the results in a practical situation. [less ▲]

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See detailGetDP/Gmsh: Benefits and Pitfalls of an Open Software Environment
Geuzaine, Christophe ULg

in Kettunen, L. (Ed.) Proceedings of the Advanced Computational Electromagnetism workshop, Seminar on Modern Software Design (2004, August 02)

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See detailWhat can the S [B9] database do for you?
Pourbaix, D.; Jancart, Sylvie ULg; Boffin, H. M. J.

in Allen; Scarfe (Eds.) The environments and evolution of double and multiple stars (2004, August 01)

This paper illustrates different kinds of problems that can be tackled with S [B[SUP]9[/SUP]], the 9th catalogue of spectroscopic binary orbits.

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See detailGeophysical Validation of SCIAMACHY NO2 Vertical Columns: Overview of Early 2004 Results
Lambert, Jean-Christopher; Blumenstock, Thomas; Boersma, F. et al

in Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), ESA-ESRIN, Frascati, Italy, 3-7 May 2004 (ESA SP-562, August 2004) ESC01JL1 (2004, August)

Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public ... [more ▼]

Following the recommendations drawn after the Commissioning Phase of the ENVISAT satellite in 2002, SCIAMACHY near real time data processors were upgraded to version 5.01 in early 2004. Before public release of the new SCIAMACHY nitrogen dioxide (NO2) vertical column data product, several validation teams investigated its improvement and assessed its geophysical consistency by means of correlative studies involving NDSC-affiliated ground-based networks of DOAS UV-visible and FTIR spectrometers and the ERS-2 GOME satellite. In parallel, preliminary SCIAMACHY NO2 column data products generated by research processors under development at scientific institutes were also tested, using the same correlative data and validation procedures. Digesting the results obtained by a list of validation teams and SCIAMACHY data processing teams, this overview paper draws a preliminary quality assessment of the SCIAMACHY NO2 column data sets available in spring 2004. [less ▲]

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See detailGeneration of closed-form models for the control of flexible mechanisms: a numerical approach
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proc. of the 7th Int. Conf. on Motion and Vibration Control (MOVIC) (2004, August)

In robotics, most high performances control strategies require a closed-form representation of the mechanical dynamic behaviour. This is even more critical when significant flexible effects are to be ... [more ▼]

In robotics, most high performances control strategies require a closed-form representation of the mechanical dynamic behaviour. This is even more critical when significant flexible effects are to be considered in the control algorithm. This paper presents a method to build closed-form dynamic equations for flexible multibody systems in terms of minimal coordinates. Relying on the Finite Element (FE) formulation, the method is able to tackle complex topologies with closed-loops in a systematic way. The method is based on an interpolation strategy. For a number of selected points in the configuration space, a full Finite Element model is built and reduced according to a component mode synthesis. Then, a piecewise polynomial model is adjusted to match the collected data. In order to guarantee the continuity of the model, a mode tracking strategy is implemented. After the presentation of the reduction procedure and of the interpolation strategy, a four-bar mechanism is analyzed as an illustrative example. [less ▲]

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See detailImprovement of students’ motivation in a pe class. An action-research project
Cloes, Marc ULg; Viseur, C.; Motter, Pascale

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been ... [more ▼]

Adolescents' motivation is a major concern of PE teachers. Many students, especially girls, are characterized by unmotivated behaviours in the gym. For two decades, quantitative research has been conducted to better understand the problem. More recently, some qualitative studies have been proposed. ... [less ▲]

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See detailAnalysis of anthropometric caracteristics and jumping ability in junior top level volleyball athletes. Comparison by role
Ciccarone, G.; Fontani, G.; Albert, Adelin ULg et al

Poster (2004, August)

This study is focused on the comparison of the players characteristics in youth Italian top level volleyball athletes according to the role on the game.

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See detailPE teachers’ competencies: which ones are considered as the most important and where are they acquired?
Cloes, Marc ULg; Laraki, Nadine; Piéron, Maurice

Poster (2004, August)

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists ... [more ▼]

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists the competencies that teachers should develop to achieve their role within the educational system. This study aimed to identify competencies taht PE teachers consider as important and to determine, from their point of view, in which context these competencies are developed. [less ▲]

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See detailA heat piloted residential 5 kW fuel cell
Lilien, Jean-Louis ULg; Maréchal, François; Lerson, Sébastien et al

(2004, August)

based on residential house demand (electrical, heating, domestic hot water), the optimisation of the use of a SOFC fuel cell of about 5 kWe is detailed to reduce CO2 emission at their minimum.

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See detailAnalysis of the volleyball spike: relationships between several parameters and the speed of the ball
Cloes, Marc ULg; Croisier, Jean-Louis ULg; Barsin, M. et al

in Proceedings of the 2004 Pre-Olympic Congress Sport Science through the Ages (2004, August)

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See detailA distributed algorithm for weighted max-min fairness in MPLS networks
Skivée, Fabian ULg; Leduc, Guy ULg

in Lecture Notes in Computer Science (2004, August), 3124

We propose a novel distributed algorithm to achieve a weighted max-min sharing of the network capacity. We present the Weight Proportional Max-Min policy (WPMM) that supports a minimal rate requirement ... [more ▼]

We propose a novel distributed algorithm to achieve a weighted max-min sharing of the network capacity. We present the Weight Proportional Max-Min policy (WPMM) that supports a minimal rate requirement and an optional maximal rate constraint and allocates network bandwidth among all aggregates based on a weight associated with each one. Our algorithm achieves this policy for IP/MPLS networks using the RSVP-TE signalling protocol. It uses per-LSP accounting in each node to keep track of the state information of each LSP. It uses a novel explicit bottleneck link strategy and a different control architecture in which we update the control packet in the forward path. Simulations show that these two elements improve substantially the convergence time compared to algorithms designed for ATM networks. [less ▲]

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See detailInfluence of DMM addition in light fuel oil on the flame emission in a domestic hot water boiler
Masy, Cédric; Ngendakumana, Philippe ULg

Conference (2004, August)

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose ... [more ▼]

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler whose burner is equipped with a spill-return atomizer. The tests have been performed in steady state regime without and with addition of DMM. During all the tests, the oxygen at the chimney was kept constant (around 3%) by adjusting the position of the burner air damper and thus the air combustion mass flow rate. The combustion chamber has two quartz windows through which the flame emission was registered by using a photodiode sensible in visible range. Classical gas analysers were used to measure the CO and NOx concentrations at the chimney. DMM percentages up to 15% (by mass) have been tested. [less ▲]

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See detailAnalysis of the volleyball spike: relationships between several parameters and the speed of the ball
Cloes, Marc ULg; Croisier, Jean-Louis ULg; Barsin, M. et al

Poster (2004, August)

In volleyball, the spike's effectiveness is a determining element of the team's success. To perform at a high level, a player must be able to produce spikes characterized by a speed of the ball that ... [more ▼]

In volleyball, the spike's effectiveness is a determining element of the team's success. To perform at a high level, a player must be able to produce spikes characterized by a speed of the ball that increase the defence's uncertainly. A high speed spike needs technical and muscular qualities. ... [less ▲]

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See detailPork quality as related to halothane genotype and slaughter conditions in a belgian study
Leroy, Bernadette ULg; Beduin, Jean-Marie; Etienne, Grégory et al

in Proceedings of the 50th International Congress of Meat Science and Technology (2004, August)

The objectives of this study were to evaluate technological and organoleptic properties of pork meat representative of different Belgian production systems and to determine the contribution of significant ... [more ▼]

The objectives of this study were to evaluate technological and organoleptic properties of pork meat representative of different Belgian production systems and to determine the contribution of significant factors to meat quality variability, in particular the halothane genotype, fasting time, lairage time and slaughtering plant. A total of 521 pigs were used in five Belgian commercial slaughtering plants over a 1 ½ year period. 79% of pigs belonged to four different quality production systems. The remaining 21% were randomly sampled in standard production. The lairage time (LT) was measured at slaughter. In the slaughterline, the entire intestinal tractus (OW) and the carcass (HCW) were weighed, the pH1 and electrical conductivity (PQM1) were measured 45 min post mortem in the longissimus dorsi muscle. One 2.5 cm thick cut of this muscle was removed 24h post mortem for further measurements in the lab : ultimate pH (pHu), ultimate electrical conductivity (PQMu), color (CIE L*a*b*), drip loss (DL), cooking loss (CL) and tenderness (WBPSF). The halothane genotype (CC, CT and TT for homozygote negative, heterozygote negative and homozygote positive for the RYR1 gene mutation respectively). The data were analyzed using SAS and the General Linear Model (GLM) SAS procedure was used in order to estimate the influence of halothane genotype, LT and slaughterhouse on the variability of pH1, PQM1, pHu, PQMu, drip loss, cooking loss, CIE Lab and WBPSF. The relative weight of OW on HCW was included in the models as covariate and used as inverse indicator of the fasting time. Least Squares Means (LSM) were computed for significant effect in the models and compared pairwise by the Student’s t-test. A large variation was observed for the meat quality parameters, in particular for pH1 (from 5.30 to 6.85), DL (from 1.2 to 11.4%) and CIE L* (from 41.6 to 66.4%). The lowest values for pH1 and highest values for DL or CIE L* indicated the presence of pale, soft, exudative meat. For all parameters –except for the pHu, CL and WBPSF– a moderate to great part of variation was explained by the GLM models (R² = 0.22-0.56). The halothane genotype effect was highly significant (p<0.001) on most meat quality traits : pH1, PQM1, PQMu and color parameters (CIE Lab) but not significant on pHu and CL. The LT had a highly significant influence only on PQMu, CIE b and DL. There was a highly significant effect (p<0.01) of the slaughtering plant on pH1, PQM1, PQMu and color parameters (CIE Lab) and a significant influence (p<0.01) on the variability of DL and CL. By contrast, the fasting time had no effect on most meat quality parameters except on DL (p<0.01) and CL (p<0.001). As indicated by the regression coefficient, an increase of OW/hot HCW seems to be related to an increase of DL (p<0.01) or CL (p<0.001). From the halothane genotype Least Squares Means and their standard errors, it appeared that meat quality was negatively affected by the presence of the RYR1 mutation. DL differed significantly (p<0.05) between genotypes with the TT pigs having the highest DL (6.8%) while that of the CC (5.5%) was the lowest and that of CT intermediate (6.1%). CL was also significantly higher (p<0.05) in TT pigs indicating lower water holding capacity. Significant differences between CC and TT genotypes (p< 0.05) were observed in terms of pH1 (6.12 vs 5.69), PQM1 (4.9 vs 6.4) and PQMu (9.7 vs 12.7). The CIE L and b values (56.9% and 16.6) were significantly higher (p<0.05) in the TT group comparatively to CC (55.0% and 15.8%) or CT pigs (54.6% and 15.4). The higher L value of the TT genotypes indicated paler meat. The WBPSF was the lowest for CT pigs with no significant difference observed between the CC and TT genotypes. A significant effect (p<0.05) of the abattoir was observed for all meat quality parameters. Although it would be necessary to determine the reasons for abattoirs differences, the small and old structure of one of the abattoirs and the lack of training of the staff could partially explain the results. Further research is needed to evaluate the interaction terms and to identify slaughtering factors which could explain slaughterhouse differences in terms of meat quality. [less ▲]

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See detailNew Insights in the History of the First International Congress of Geography (Antwerp, 1871).
Vandersmissen, Jan ULg

Conference (2004, August)

The internationalisation of geography gained its full strength after World War I. But this phenomenon originated in the third quarter of the nineteenth century, encouraged by the public attention for ... [more ▼]

The internationalisation of geography gained its full strength after World War I. But this phenomenon originated in the third quarter of the nineteenth century, encouraged by the public attention for exploration, the gradual professionalisation of geography at universities, and the organisation of international congresses. The first congres of this type was organised in Antwerp, Belgium, in 1871. The meeting set standards for all other pre-War international congresses of geography. In this contribution we give new insights in the realization of the Antwerp Congress. We focuss on the initiators Charles Ruelens, Jan-Hubert Van Raemdonck and Pierre Génard, their motives for action, the challenges and difficulties they found on their way. We discuss the collaboration between the Belgian organising committee and the European geographical societies, in particular the “Société de Géographie de Paris”. We discover how the first programme was drawn up en give a detailed image of the participants, paying attention to their origins and fields of interests. Finally we show the results of their debates and try to evaluate the lasting results of the encounter. This paper is based on the recently discovered archives of the first Congress in the City Archives of Antwerp. [less ▲]

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See detailThe equilibrium finite element model and error estimation for plate bending
Nguyen-Xuan, Hung; Debongnie, Jean-François ULg

Conference (2004, August)

This paper presents a procedure for computing approximate solution of bending Kirchhoff plate with an equilibrium finite element model. The accuracy of the equilibrium approach is evaluated through the ... [more ▼]

This paper presents a procedure for computing approximate solution of bending Kirchhoff plate with an equilibrium finite element model. The accuracy of the equilibrium approach is evaluated through the concept of error estimator. Especially, a dual analysis by finite elements which leads to lower and upper bounds of the exact solution is presented in numerical examples. [less ▲]

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See detailAssessment of the Electric and Magnetic field levels in the vicinity of the HV overhead power lines in Belgium.
Hoeffelman, Jean; Decat, Gilbert; Lilien, Jean-Louis ULg et al

in Conférence Internationale des Grands Réseaux Electriques à Haute Tension - CIGRE (2004, August)

Maximum exposure levels in the vicinity of HV power lines in Belgium.

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See detailDiversité intra-organisationnelle et sens au travail dans les centres d'appels externes
Naedenoen, Frédéric ULg; Zune, Marc

Conference (2004, August)

Après avoir décrit le secteur des centres d’appels sous les traits universels d’un post-taylorisme, la littérature souligne depuis peu l’hétérogénéité du secteur. Nous concentrons notre propos sur la ... [more ▼]

Après avoir décrit le secteur des centres d’appels sous les traits universels d’un post-taylorisme, la littérature souligne depuis peu l’hétérogénéité du secteur. Nous concentrons notre propos sur la diversité organisationnelle présente au sein même d’une entreprise et mettons en évidence l’existence de deux logiques organisationnelles en tension, que nous qualifions de centrifuge et de centripète. A partir du concept giddensien de "région", nous envisageons ensuite les conséquences de cette situation sur le sens que les téléopérateurs donnent à leur travail. [less ▲]

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See detailTravail sans repère et qualité de vie: de nouveaux enjeux psychosociaux
Renier, Nathalie ULg; Rorive, Brigitte

Conference (2004, August)

Les formes de flexibilité fonctionnelle souvent présentées comme des approches « gagnant-gagnant » permettant aux individus et aux organisations de mieux s’adapter aux pressions de leurs environnements ... [more ▼]

Les formes de flexibilité fonctionnelle souvent présentées comme des approches « gagnant-gagnant » permettant aux individus et aux organisations de mieux s’adapter aux pressions de leurs environnements, ne sont pas sans incidence sur la qualité du travail et de l’emploi. Elles favorisent l’apparition de nouvelles formes de précarité et de vulnérabilité jusqu’ici peu prises en considération. Elles concernent autant les conditions de travail (difficulté à résister aux pressions temporelles, à articuler les différents niveaux d’exigence, à se conformer à de nouvelles formes de contrôle) que les conditions d’emploi (dilution du lien de subordination, modification de la relation d’emploi, invisibilité du travail, etc.). Les principales réponses apportées à ces difficultés résident dans le développement de compétences d’auto-gouvernance et l’émergence de nouveaux mécanismes identitaires. [less ▲]

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See detailPhase separation during silica gel formation followed by time-resolved SAXS
Gommes, Cédric ULg; Goderis, Bart; Pirard, Jean-Paul ULg et al

Poster (2004, August)

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See detailLimiting windstorm effects on tower by the « low drag » cable
Lilien, Jean-Louis ULg; Snegovski, Dmitri; Capelle, Thierry et al

(2004, August)

Hurricane winds affect the flow around electrical conductor in a way that it may reach the critical (Drag crisis) and postcritical states. It is thus important to introduce the cable aerodynamic drag as ... [more ▼]

Hurricane winds affect the flow around electrical conductor in a way that it may reach the critical (Drag crisis) and postcritical states. It is thus important to introduce the cable aerodynamic drag as Reynolds-dependent when calculating the response of the power transmission line under hurricane. To represent the respective wind loading on cable, the turbulent, spatially non-uniform wind model is used. In order to assess the behaviour and cyclic fatigue loads under hurricane conditions of different transmission line conductors, the time response analyses were done. Results of comparative study of the smooth cable AERO-Z and classical multistrand cable, including the percentage of load reduction offered to supporting structure, are presented. [less ▲]

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See detailRadiosynthesis and in vivo evaluation of 123I-rTIMP-2 as potential SPECT tumour imaging agent
Oltenfreiter, R.; Staelens, L.; Burvenich, I. et al

in European Journal of Nuclear Medicine & Molecular Imaging (2004, August), 31(Suppl. 2), 391

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See detailFirst Ground-Based Validation of SCIAMACHY V5.01 Ozone Column
Lambert, Jean-Christopher; Allaart, M; Andersen, S.B. et al

in Proceedings of the Second Workshop on the Atmospheric Chemistry Validation of ENVISAT (ACVE-2), ESA-ESRIN, Frascati, Italy, 3-7 May 2004 (ESA SP-562, August 2004) ESC01JL1 (2004, August)

In early 2004, the near real-time data processor of ENVISAT SCIAMACHY (SCI_NL) was upgraded to version 5.01. Based on the correlative measurements acquired and collected during the commissioning phase of ... [more ▼]

In early 2004, the near real-time data processor of ENVISAT SCIAMACHY (SCI_NL) was upgraded to version 5.01. Based on the correlative measurements acquired and collected during the commissioning phase of the satellite in 2002, a preliminary validation was organised to verify the improvement and assess the geophysical consistency of the new SCIAMACHY ozone vertical column data product. The present overview summarises the results obtained by a list of validation teams and involving ground-based data acquired from pole to pole by complementary ground-based sensors. The studies conclude to an improvement compared to previous versions 3.5x. They also confirm the presence of expected errors (e.g. dependence on solar elevation and on ozone column) inherited from the GOME Data Processor GDP 2.4, on which the SCIAMACHY processor SCI_NL is based. [less ▲]

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See detailA systematic model reduction method for the control of flexible multibody systems
Bruls, Olivier ULg; Duysinx, Pierre ULg; Golinval, Jean-Claude ULg

in Proc. of the 21st Int. Congress of Theoretical and Applied Mechanics (ICTAM) (2004, August)

This paper presents a method to build closed-form dynamic equations for flexible multibody systems with a minimal kinematic description. Relying on the Finite Element formalism, the method is able to ... [more ▼]

This paper presents a method to build closed-form dynamic equations for flexible multibody systems with a minimal kinematic description. Relying on the Finite Element formalism, the method is able to tackle complex topologies with closed-loops in a systematic way. Thus, it will be of great use in the framework of model based control of flexible mechanisms. The reduction procedure is based on an interpolation strategy: a Finite Element model is built and reduced for a number of selected points in the configuration space, and then, a piecewise polynomial model is adjusted to match the collected data. A few applications of the reduction method are considered: a serial pick-and-place machine, a flexible four bar mechanism, and a parallel kinematic manipulator. [less ▲]

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See detailOrganisation of « sport + studies programmes » at secondary school level: the perceptions of the students and the staff
Cloes, Marc ULg

in Klissouras, V.; Kellis, S.; Mouratidis, I. (Eds.) Proceedings of the 2004 Pre-Olympic Congress. Sport Science through the Ages. (2004, August)

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and ... [more ▼]

It is undeniable that sporting success requires an intensive practice, increasingly early and strictly supervised. This necessarily implies that the young athltes find a balance btween the sporting and school education. All around the world, seceral organisations were proposed in order to facilitate the task of the sporting hopes and to enable them to encure their future life as well as possible. [less ▲]

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See detailShort-circuit mechanical effects on outdoor HV substations with wide bundling.
Pitz, Volker; Köster, Hans-Joachim; Stein, Norbert et al

in Conférence Internationale des grands réseaux électriques à haute tension - CIGRE (2004, August)

This paper presents results of a research project investigating the mechanical effects of short-circuit currents in high-voltage substations with conductor bundles. The experimental part was performed on ... [more ▼]

This paper presents results of a research project investigating the mechanical effects of short-circuit currents in high-voltage substations with conductor bundles. The experimental part was performed on two set-ups, called "100 kV arrangement" and "400 kV arrangement". Those two set-ups differed in the height of the crossarm, the phase-to-phase distance and the conductor sag. Additional parameters which were varied in the course of the experiments included the level and duration of the short-circuit current, the type and number of the spacers used and the bundle spacing. Various forces in the flexible busbar and the supporting structure were recorded during the tests and the stiffness as well as the eigenfrequency of the portals used for supporting the conductors were determined. The test results were evaluated with respect to the maxima of the pinch force, the tensile force and the drop force. They are presented and compared with existing assumptions and calculation methods. The results of this project shall enable IEC standardization committees and CIGRE working groups to carry on with their intended studies and establish a comprehensive method of calculating the mechanical effects in substations with bundle conductors. [less ▲]

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See detailA Systems Biology Perspective of Apoptosis Signalling
Bullinger, Eric ULg

Conference (2004, July 24)

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See detailHydrodechlorination of 1,2-dichloroethane on Pd-Ag catalysts supported on texture-tailored materials
Job, Nathalie ULg; Heinrichs, Benoît ULg; Ferauche, Fabrice et al

Conference (2004, July 19)

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See detailContribution to the design of sway composite frames
Maquoi, René ULg; Jaspart, Jean-Pierre ULg; Demonceau, Jean-François ULg

in Leon, Roberto; Lange, Jörg (Eds.) Composite Construction in Steel and Concrete V (2004, July 18)

This paper presents numerical and analytical studies carried out at Liège University, as part of a European research project, with the objective to investigate the in-plane behaviour of composite sway ... [more ▼]

This paper presents numerical and analytical studies carried out at Liège University, as part of a European research project, with the objective to investigate the in-plane behaviour of composite sway frames under static loading. [less ▲]

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See detail"Maladresse et malentendu : quelle place pour le mal en sémiotique ?"
Servais, Christine ULg

Conference (2004, July 09)

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See detailAltérité vs altération : rassemblement et exclusion dans le média de masse
Servais, Christine ULg

Conference (2004, July 08)

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See detailRecent progress in the macromolecular engineering of aliphatic polyesters
Jérôme, Robert ULg; Li, Haiying; Rieger, Jutta et al

Conference (2004, July 04)

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See detailMachining processes simulation : specific finite element aspects
Masset, Luc ULg; Debongnie, Jean-François ULg

in Journal of Computational & Applied Mathematics (2004, July 01), 168(1-2), 309-320

The paper presents a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. For these operations, the form error is often due to the flexibility ... [more ▼]

The paper presents a simulation tool designed to predict form errors of part surfaces obtained by face milling and turning processes. For these operations, the form error is often due to the flexibility of the workpiece and its supports. The finite element method is adopted to model the part geometry and to compute its deformations. Numerous load cases are required to obtain the form error so that classical resolution methods prove to be inefficient (CPU time, memory and disk space). The paper mainly focuses on the special computation scheme adopted in order to improve the resolution of such an atypical problem. [less ▲]

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See detailIntercomparisons of MIPAS operational N2O and HNO3 profiles with ground based FTIR data
Vigouroux, C.; De Mazière, M.; Wood, S. et al

Poster (2004, July)

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See detailDistribution of nerve fibers and prion protein expression in mouse Peyer's patches
Defaweux, Valérie ULg; Dorban, G; Demonceau, C et al

Poster (2004, July)

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See detailCombination of trophic biomarkers to distinguish among Antarctic amphipods trophic guilds
Nyssen, Fabienne ULg; Dauby, Patrick ULg; Graeve, Martin

Conference (2004, July)

Peracarid crustaceans and amphipods in particular are an important group in the Southern Ocean and one of the most diverse in the macrozoobenthos. As a part of a multidisciplinary study of the amphipods ... [more ▼]

Peracarid crustaceans and amphipods in particular are an important group in the Southern Ocean and one of the most diverse in the macrozoobenthos. As a part of a multidisciplinary study of the amphipods ecological roles in Antarctic benthic systems, about 150 specimens belonging to 25 species of 10 of the most common amphipod families occurring in the Southern Ocean have been involved in this study of amphipod trophic patterns. Beside “classical” stomach content analysis or field observations, the use of naturally occurring stable isotopes of carbon (δ13C) and nitrogen (δ15N) has recently provided new insights into food web ecology. This method is based on the direct relationship established between the isotopic signature of an organism and that of its preys. Nitrogen-15 typically shows a step-wise increase with trophic level within a food chain. Closer to the value of the diet, carbon-13 is preferentially used to assess the relative proportion of potential primary sources in a trophic web (ex.: pelagic vs benthic contribution to food intake). Furthermore, for several species, the lipid signature – which has already been used successfully to help understand marine trophodynamics – and more particularly the fatty acid composition has been investigated as trophic biomarkers to reveal more precisely to which trophic guild they belong to. [less ▲]

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See detailDISSIPATIVITY AND GLOBAL ANALYSIS OF LIMIT CYCLES IN NETWORKS OF OSCILLATORS
Stan, Guy-Bart; Sepulchre, Rodolphe ULg

in Proceedings of the 16th Symposium on Mathematical Theory of Networks and Systems (2004, July)

This paper is concerned with the global analysis of synchrone oscillations in special networks of oscillators. In previous work, we de ned a class of highdimensional, parameter-dependent nonlinear systems ... [more ▼]

This paper is concerned with the global analysis of synchrone oscillations in special networks of oscillators. In previous work, we de ned a class of highdimensional, parameter-dependent nonlinear systems exhibiting almost globally asymptotically stable limit cycle oscillations. In this paper, we show how (incremental) dissipativity may be used to extend the global analysis of limit cycle oscillations to networks of coupled identical systems. [less ▲]

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See detailNew analogues of the potassium channel opener cromakalim : effects on rat pancreatic B-cells and rat aorta rings
Sebille, S.; De Tullio, Pascal ULg; Antoine, M. H. et al

Poster (2004, July)

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See detailEstrogens and pain : a study in aromatase knock-out mice using the formalin model
Multon, Sylvie ULg; Mosen, Jeanine; Wouters, Murielle ULg et al

Poster (2004, July)

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See detailNonlinear System Identification using Interpolated Short Time Fourier Transform
Shi, Dongfeng; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

For the purpose of constructing the backbone of nonlinear systems, the Interpolated Short Time Fourier Transform (ISTFT) is proposed as a means to improve the estimation accuracy of the instantaneous ... [more ▼]

For the purpose of constructing the backbone of nonlinear systems, the Interpolated Short Time Fourier Transform (ISTFT) is proposed as a means to improve the estimation accuracy of the instantaneous amplitudes and frequencies of response signals. It is shown that the backbone curves estimated by the ISTFT agree with theoretical backbone curves very well. Additionally, the restoring force can be reconstructed to specify the type of nonlinear stiffness. A curve-fitting technique is introduced to estimate the parameters of nonlinear systems on the basis of theoretical backbone curves. It is shown that a number of typical nonlinear stiffness functions such as cubic, bilinear and pre-compressed springs can be identified accurately using this new method. [less ▲]

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See detailGallbladder mucocele: diagnosis, treatment and outcome in 4 dogs
Carofiglio, Francesca; Bongartz, Alexandre; Busoni, Valeria ULg et al

Poster (2004, July)

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See detailRelativisme, pluralisme et socialisation politique : l’apport de Jean Piaget au débat
Fournier, Bernard ULg

Conference (2004, July)

Recent developments in theory insist on the existence of a plurality of individual realities within the same social group. However, the logic of understanding used to analyse these realities in the ... [more ▼]

Recent developments in theory insist on the existence of a plurality of individual realities within the same social group. However, the logic of understanding used to analyse these realities in the empirical research still relies too much on a univocal perspective in which the concepts are perceived to be homogeneous. This manner of approaching reality legitimates the linear explanations of attitudes and individual behaviours. But a reflection on the effective processes of constructing the individual worlds of reference based on a psychological perspective strongly challenges this logic. Thus, the works of Jean Piaget clearly show that the individual is not a passive being in the dynamics of appropriating the world, but that he or she assimilates the social context, accommodates it to what he or she already understands and thereby transforms it. This theoretical framework opens the path to an interesting form of conceptual relativism where every concept has to be replaced into the context as it is structured by the individuals’ worlds of reference. This relativity presents a challenge to empirical research: Which principle of synthesis would allow us to respect the theoretical plurality proposed by the piagetian interpretation? So far, we have mostly used a methodology based on the classificatory approach in our research, but we are by now more aware of its limitations as well. [less ▲]

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See detailSubspace Monitoring of Multivariate Dynamic Systems
Kruger, Uwe; Treasure, Richard; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

In this article, the monitoring of continuous processes using linear dynamic models is presented. It is outlined that dynamic extensions to conventional multivariate statistical process control (MSPC ... [more ▼]

In this article, the monitoring of continuous processes using linear dynamic models is presented. It is outlined that dynamic extensions to conventional multivariate statistical process control (MSPC) models may lead to the inclusion of large numbers of variables in the condition monitor. To prevent this, a new dynamic monitoring scheme, based on subspace identification, is introduced, which can (i) determine a set of state variable for describing process dynamics and (ii) produce a reduced set of variables to monitor process performance. This is demonstrated by an application study to a realistic simulation of a chemical process. [less ▲]

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See detailRelaxant effects on the rat uterine smooth muscle of putative K+ATP channel openers
Boverie, S.; De Tullio, Pascal ULg; Sebille, S. et al

Poster (2004, July)

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See detailCatalytic applications of transition metal N-heterocyclic carbene complexes bearing nitrogen-containing side-groups
Tudose, Adriana; Sauvage, Xavier; Delfosse, Sébastien et al

Poster (2004, July)

Herein, we report preliminary results in olefin cyclopropanation, olefin metathesis, atom transfer radical reactions (ATRA and ATRP), and in the Suzuki coupling reaction when catalyst systems were ... [more ▼]

Herein, we report preliminary results in olefin cyclopropanation, olefin metathesis, atom transfer radical reactions (ATRA and ATRP), and in the Suzuki coupling reaction when catalyst systems were generated in situ from [RuCl2(p-cymene)]2 or Pd(OAc)2, and an imidazolium salt bearing nitrogen-containing substituents. [less ▲]

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See detailSystem optimization for residential SOFC 5 kW heat and electricity management
Lilien, Jean-Louis ULg; Lerson, Sébastien; Pochet, Nicolas

(2004, July)

A demonstration project will be presented using a 5 kW Solid Oxyde Fuel Cell for residential application in the region of Liège, Belgium. The current stage of the project is to evaluate the thermal ... [more ▼]

A demonstration project will be presented using a 5 kW Solid Oxyde Fuel Cell for residential application in the region of Liège, Belgium. The current stage of the project is to evaluate the thermal management of a single house with, at the present time, 45 MW.h (thermal 25 MW.h, electrical 20 MW.h) annual consumptions. The changes needed from a classical gas boiler heating of 20 kW to a 6 kW (thermal) plus 5 kW (electrical) system will be studied and detailed. Evaluation of CO2 reduction in the two systems will be presented considering the Belgium mix of electricity production. The heat and electricity local storage to cover peak demand in both energy demands will be discussed in relation with a grid-connected fuel cell. In particular the detailed analysis of this home demand will be analysed for the last three years. An original thermal circuit will be proposed, including its regulation. The experimental result of the behaviour of our proposal during 2003-2004 winter will be presented using a “virtual” SOFC (actually replaced by “equivalent” 6 kWth boiler) which is intended to be used in the same environment after this testing period. Constrains related to SOFC typical behaviour will be taken into account in our proposal for regulation. Depending on our development, it may be possible that up-to-date results may be given at the conference with a real system using a true SOFC 5 kW which would be in service after Septembre 2004. [less ▲]

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See detailTowards a SCAR 'Marine Biodiversity Information Network'
De Broyer, Claude; Danis, Bruno; Meerhaeghe, A et al

Poster (2004, July)

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See detailIdentification and model Updating of a non-stationary vibrating system
Dimitriadis, Grigorios ULg; Fassois, Spilios; Poulimenos, Aggelos et al

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

Non-stationary systems, which are commonly encountered in many fields of science, are characterized by time-varying features and require time-frequency methods for their analysis. This study considers the ... [more ▼]

Non-stationary systems, which are commonly encountered in many fields of science, are characterized by time-varying features and require time-frequency methods for their analysis. This study considers the problem of identification and model updating of a non-stationary vibrating system. In particular, a number of identification methods and a model updating procedure are evaluated and compared through application to a time-varying “bridge-like” laboratory structure. The identification approaches include Frequency Response Function based parameter estimation techniques, Subspace Identification and Functional Series modelling. All methods are applied to both output-only and input-out-put data. Model updating is based upon a theoretical model of the structure obtained using a Rayleigh-Ritz methodology, which is updated to account for time-dependence and nonlinearity via the identification results. Interesting comparisons, among both identification and model updating results, are performed. The results of the study demonstrate high modelling accuracy, illustrating the effectiveness of model updating techniques in non-stationary vibration modelling. [less ▲]

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See detailUse of autogenous fascia lata graft for perineal herniorrhaphy in dogs: a preliminary study
Bongartz, Alexandre; Carofiglio, Francesca; Heimann, Marianne et al

in Proceedings du 13th Annual Scientific Meeting ECVS (2004, July)

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See detailGeneralized parton distributions of the pion
Bissey, F.; Cudell, Jean-René ULg; Cugnon, Joseph ULg et al

in Nuclear Physics B-Proceedings Supplements (2004, July), 133

Off-forward structure functions of the pion are investigated in twist-two and twist-three approximation. A simple model is used for the pion, which allows to introduce finite size effects, while ... [more ▼]

Off-forward structure functions of the pion are investigated in twist-two and twist-three approximation. A simple model is used for the pion, which allows to introduce finite size effects, while preserving gauge invariance. Results for the imaginary parts of the gamma*pi --> gamma*pi off-forward amplitude and of the structure functions are presented. Generalized Callan-Gross relations are obtained. [less ▲]

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See detailWake-Induced Vibration in Power Transmission Line. Parametric study
Lilien, Jean-Louis ULg; Snegovski, Dmitri

in Flow Induced Vibration - FIV 2004 (2004, July)

The paper discusses some aspects of modeling the wake-induced vibrations of the bundle conductors in transmission lines. The wake coupling between subconductors is modeled with the modified Simpson’s ... [more ▼]

The paper discusses some aspects of modeling the wake-induced vibrations of the bundle conductors in transmission lines. The wake coupling between subconductors is modeled with the modified Simpson’s approach. In order to apply this model to the analysis of power transmission line (PTL), a modal representation of a span could be used. In present paper we study how application of Dynamic Reduction (Component Mode) technique may improve such analysis under finite-element approach. The present paper, to extent of authors’ knowledge, is the first where Component Mode method application is discussed to study the subspan oscillation. Finally, bundled conductors’ susceptibility to wake-induced vibrations is illustrated on an exemplary twin-bundle, three-subspan model. Effects of bundle parameters (initial subconductor spacing, frequency ratio, subconductor mass), and the means to account them when applying the component mode method are discussed. [less ▲]

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See detailEpidemiology of lesions in high-level competition judo
Zinzen, E.; Vanbergen, Johanne; Clarijs, Jan Pieter et al

in Abstract Book of the 9th Annual Congress of the European College of Sports Science (2004, July)

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See detailMultiple Frequency Analysis Methods for Blade Tip-Timing Data Analysis
Gallego-Garrido, Jon; Dimitriadis, Grigorios ULg

in Akay, A.; Arnas, O.; Cooper, J. E. (Eds.) et al Proceedings of 7th Biennial ASME Conference on Engineering Systems Design and Analysis (2004, July)

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. The system aims to replace strain gauge technology. However ... [more ▼]

Blade Tip-Timing (BTT) is a method for the measurement of blade vibration in rotating bladed assemblies such as those found in turbomachinery. The system aims to replace strain gauge technology. However all current BTT analysis methods fail to recover the correct frequencies when two blade modes are excited simultaneously by a synchronous vibration. In this paper, five new methods that can recover simultaneous frequencies from BTT data are presented. The methods are based on the auto-regressive approach. The approaches make use of data either from a single blade and single revolution or from multiple revolutions. Furthermore, some of the methods are designed to allow for the presence of measurement errors. The techniques are validated on three test cases in which simulated data was used. It is shown that most of the methods produce accurate estimates for the vibration frequency, even in the presence of significant noise levels, provided that a suitable amount of the response waveform is measured. The most consistent estimates are obtained from the methods that make use of data from multiple revolutions. [less ▲]

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See detail3D simulation of Industrial Hall in case of fire. Benchmark between ABAQUS, ANSYS and SAFIR
Vassart, Olivier; Cajot, Louis-Guy; O'Connor, Marc et al

in Interflam2004 Proceedings. Fire Sciences and Engineering Conference (2004, July)

For simple storey buildings, the structural behaviour in case of fire is relevant only for the safety of the firemen. The protection of occupants and goods is a matter of fire spread, smoke propagation ... [more ▼]

For simple storey buildings, the structural behaviour in case of fire is relevant only for the safety of the firemen. The protection of occupants and goods is a matter of fire spread, smoke propagation, active fire fighting measures and evacuation facilities. Brittle failure, progressive collapse and partial failure of façades elements outwards may endanger the fire fighters and have to be avoided. In order to deal with such an objective, the simulation softwares has to cover the 3D structural behaviour including membrane and restrained effects as well as the failure mode so that post-local failure stage can be analysed. Such calculation models (ANSYS, ABAQUS and SAFIR [1]) have been compared true a benchmark. In this benchmark, two different users used ABAQUS. [less ▲]

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See detailDirected forgetting in normal aging: the role of processing speed
Hogge, Michaël; Adam, Stéphane ULg; Collette, Fabienne ULg

Poster (2004, June 25)

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See detailL'attachement et ses difficultés: repérages et compréhension
Battisti, Oreste ULg

in Bertrand, Jean Marie (Ed.) Troisième journée interactive du CHVE-CHC (2004, June 19)

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See detailExperimental and analytical investigations on single-sided composite joint configuration
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

in Walraven, Joost; Blaauwendraad, Johan; Scarpas, Tom (Eds.) et al 5th International PhD Symposium in Civil Engineering (2004, June 16)

For three years, in the framework of a European research project funded by the European Community for Steel and Coal (ECSC) in which the Liège University was deeply involved, intensive experimental ... [more ▼]

For three years, in the framework of a European research project funded by the European Community for Steel and Coal (ECSC) in which the Liège University was deeply involved, intensive experimental, numerical and theoretical investigations have been carried out on the behaviour of composite sway buildings under static and seismic loading. This paper presents experimental and analytical studies carried out at Liège University, as part of the above European project, with the objective to investigate the behaviour of a single-sided composite joint configuration under static loading. A particular failure mode occurred during the experimental tests, which had not yet been detected previously; it is described in details. Then, an analytical formula covering this particular phenomenon and based on a theoretical model is presented; it is validated through comparisons with experimental results. [less ▲]

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See detailHeidegger, le tournant, l'Ereignis
Pieron, Julien ULg

Conference (2004, June 12)

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See detailEmployment agencies in Belgium
Orianne, Jean-François ULg; Conter, Bernard

Conference (2004, June 11)

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See detailUrban violence and violence during sports events
Comeron, Manuel ULg

Conference (2004, June 07)

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See detailLipid and oxylipin profile during storage of potato tubers
Fauconnier, Marie-Laure ULg; Welti, R.; Delaplace, Pierre ULg et al

Poster (2004, June 03)

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See detailCatégoriser les types de participation des élèves de 16-18 ans : nouvelles données de Saint-Jean de Terre-Neuve
Fournier, Bernard ULg; Hudon, Raymond; Duggan, Andrew

Conference (2004, June 03)

Since 1990, several colleagues and I have had the opportunity to distribute surveys in Quebec, France and Belgium on youth participation and political interests. This data constitutes a rare source of ... [more ▼]

Since 1990, several colleagues and I have had the opportunity to distribute surveys in Quebec, France and Belgium on youth participation and political interests. This data constitutes a rare source of information for analysing the political attitudes of 16-18 years old. Last winter, we have distributed the same survey to the student population in St. John’s, Newfoundland and Labrador (429 high school students). In particular, participation in more than 12 movements and associations was compared with similar data collected in Quebec City in 1998. Interestingly, the same proportion of students participate in one association or another (more than two-thirds) However, it is important to go beyond the usual snapshots provided by sociological indicators to understand such behaviour. Stressing internal differences within groups is essential and cluster analysis (particularly hierarchical cluster analysis) is a perfect tool for this. With a more precise image of the various forms of participation, and with the different attitudes about involvement attached to them, several distinct discourses might be differently qualified youth participation. Moreover, the understanding of political socialization processes could also be questioned. This task, indeed, is crucial to assess and critique existing opinions about youth participation in politics. [less ▲]

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See detailAn MHD-driven Disk Wind Outflow in SDSS J0300+0048?
Hall, Patrick; Hutsemekers, Damien ULg

in AGN Physics with the Sloan Digital Sky Survey. ASPC 311 (2004, June 01)

The outflow in SDSS J0300+0048 has the highest column density yet reported for a broad absorption line quasar. The absorption from different ions is also segregated as a function of velocity in a way that ... [more ▼]

The outflow in SDSS J0300+0048 has the highest column density yet reported for a broad absorption line quasar. The absorption from different ions is also segregated as a function of velocity in a way that can only be explained by a disk wind outflow. Furthermore, the presence of the such large column densities of gas at the high observed outflow velocities may be incompatible with purely radiative acceleration. MHD contributions to the acceleration should be considered seriously. [less ▲]

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See detailDevelopment of optical ground verification method for mum to sub-mm reflectors
Stockman, Yvan ULg; Thizy, Cédric ULg; Lemaire, Philippe ULg et al

in 5th International Conference on Space Optics (2004, June 01)

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. Scientific ... [more ▼]

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. Scientific observatories require large telescopes with precisely shaped reflectors for collecting the electro-magnetic radiation from faint sources. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of the reflector shapes and antenna structures and to verify their performance under simulated space conditions (vacuum, low temperatures). Due to the specific surface characteristics of reflectors operating in these spectral regions, standard optical metrology methods employed in the visible spectrum do not provide useful measurement results. The current state-of-the-art commercial metrology systems are not able to measure these types of reflectors because they have to face the measurement of shape and waviness over relatively large areas with a large deformation dynamic range and encompassing a wide range of spatial frequencies. 3-D metrology (tactile coordinate measurement) machines are generally used during the manufacturing process. Unfortunately, these instruments cannot be used in the operational environmental conditions of the reflector. The application of standard visible wavelength interferometric methods is very limited or impossible due to the large relative surface roughnesses involved. A small number of infrared interferometers have been commercially developed over the last 10 years but their applications have also been limited due to poor dynamic range and the restricted spatial resolution of their detectors. These restrictions affect also the surface error slopes that can be captured and makes their application to surfaces manufactured using CRFP honeycomb technologies rather difficult or impossible. It has therefore been considered essential, from the viewpoint of supporting future ESA exploration missions, to develop and realise suitable verification tools based on infrared interferometry and other optical techniques for testing large reflector structures, telescope configurations and their performances under simulated space conditions. The first one is an IR-phase shifting interferometer with high spatial resolution. This interferometer shall be used specifically for the verification of high precision IR, FIR and sub-mm reflector surfaces and telescopes under both ambient and thermal vacuum conditions. The second one presented hereafter is a holographic method for relative shape measurement. The holographic solution proposed makes use of a home built vacuum compatible holographic camera that allows displacement measurements from typically 20 nanometres to 25 microns in one shot. An iterative process allows the measurement of a total of up to several mm of deformation. Uniquely the system is designed to measure both specular and diffuse surfaces. [less ▲]

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See detailA Search for Rotationally Modulated Halpha Variability in OB Supergiants
Morel, Thierry ULg; Marchenko, S. V.; Pati, A. K. et al

in Stellar Rotation (2004, June 01)

Not Available

Detailed reference viewed: 3 (2 ULg)