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See detailThe socio-economic integration of migrants in Spain
Brey, Elisa ULg

Conference (2009)

Detailed reference viewed: 9 (0 ULg)
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See detailSiGe tunnel field effect transistors: challenges for selective epitaxial growth
Loo, Roger; Iacopi, Francesca; Vanherle, Wendy et al

Conference (2009)

Detailed reference viewed: 23 (2 ULg)
Peer Reviewed
See detailUltrahigh resolution laser spectroscopy and isotope shifts for iron atoms
Krins, Stéphanie ULg; Oppel, S.; Huet, Nicolas ULg et al

Conference (2009)

Detailed reference viewed: 22 (5 ULg)
See detailFORMULATION OF PEPTIDE-LOADED LIPOSOMES FOR INTRAVENOUS DELIVERY: OPTIMIZATION OF THE ENCAPSULATION EFFICIENCY
Ducat, Emilie ULg; Brion, Michael; Evrard, Brigitte ULg et al

Conference (2009)

Purpose: Print 3G is a peptidic antagonist of oncoprotein involved in breast cancer, containing 25 amino acids. The purpose of this work is to study the peptide encapsulation into PEGylated liposomes ... [more ▼]

Purpose: Print 3G is a peptidic antagonist of oncoprotein involved in breast cancer, containing 25 amino acids. The purpose of this work is to study the peptide encapsulation into PEGylated liposomes composed of SPC:CHOL:mPEG-2000-DSPE (47:47:6). Methods: Loaded unilamellar vesicles were prepared by hydration of lipid film method. Unfortunately, a loss of Print 3G was observed during the different steps of this manufacturing technique giving rise to encapsulation efficiencies (EE) close to 0 %. Thus, the freeze-thawing method was used to enhance the amount of Print 3G encapsulated into blank liposomes prepared using the above procedure. Because many factors may influence the peptide entrapment into the vesicles (number of freeze-thawing cycles (NC), lipid concentration (LC), peptide concentration (PC) and mixing time (MT)), a design of experiment (DOE) was performed (for the screening, a Plackett and Burman plan; for the optimization, a central composite design). EE were calculated in terms of quantity of peptide loaded in liposomes as a function of quantity operated (EEp) or quantity of lipids (EEl). Results: The EE obtained by the freeze-thawing method in standard conditions (Katanasaka, Ida et al., 2008; Maeda, Bharate et al., 2008), amounted to 26.20 ± 7.98 %, n=3 (EEp) and to 0.26 ± 0.074 % (EEl). Among the different considered parameters, the screening permitted to identify two factors having a positive and significant influence on the EE: NC and LC. Concerning the PC and MT, no influence was revealed. For the second part of the DOE, the positive factors were optimized and obtained results revealed a theoretical optimum at 64.75 ± 3.55 % when 11 freeze-thawing cycles were applied (NC) and for the following LC: 36.1 mM SPC, 36.1 mM CHOL and 4mM mPEG-2000-DSPE. The experimental results showed an encapsulation efficiency of 62.68 ± 2.93 %. Photon correlation spectroscopy and freeze-fracture electron microscopy were also realized to examine the liposome integrity, before and after the freeze-thawing cycles. Conclusion: Changing the manufacturing technique permitted a significant encapsulation of Print 3G into liposomes. The DOE led to a significant improvement of encapsulation efficiencies. References: (1) Katanasaka,Y., Ida,T., Asai,T., Maeda,N., Oku,N., 2008. Effective delivery of an angiogenesis inhibitor by neovessel-targeted liposomes. International Journal of Pharmaceutics, 360, 219-224. (2) Maeda,H., Bharate,G.Y., Daruwalla,J., 2008. Polymeric drugs for efficient tumor-targeted drug delivery based on EPR effect. Eur. J Pharm Biopharm. Acknowledgements: This work was supported by the Ministry of the Walloon Region. [less ▲]

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See detailSi$_1-x$Ge$_x$ growth using Si$_3$H$_8$ by low temperature chemical vapor deposition
Takeuchi, Shotaro; Nguyen, Ngoc Duy ULg; Goossens, Jozefien et al

Conference (2009)

Detailed reference viewed: 7 (2 ULg)
Peer Reviewed
See detailCalculation of mechanical properties of polymeric foams with closed cell structure produced on the basis of neoprene
Pyka, Grzegorz; Wevers, Martine; Kerckhofs, Greet ULg et al

Conference (2009)

Detailed reference viewed: 12 (0 ULg)
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See detail200mm Si/SiGe Resonant Interband Tunneling Diodes Incorporating δ-Doping Layers Grown by CVD
Park, Si-Young; Anisha, Ramesh; Berger, Paul et al

Conference (2009)

Detailed reference viewed: 15 (1 ULg)
See detailInfluences de l'environnement sur la fonction endocrinienne
Charlier, Corinne ULg

Conference (2009)

Detailed reference viewed: 8 (4 ULg)
Peer Reviewed
See detailSearching for traces of life in ancient stromatolites down to the nanoscale.
Lepot, Kevin ULg; Philippot, Pascal; Benzerara, Karim et al

Conference (2009)

Detailed reference viewed: 25 (1 ULg)
Peer Reviewed
See detailRegional mapping of pedogeochemical background in Southern Belgium: Combining grid-survey measurements with existing maps of the physical environment.
Colinet, Gilles ULg; Bock, Laurent ULg

Conference (2009)

Among natural factors driving the soil content in metallic trace elements (MTE), the geochemical background is often deemed as a sound base for the detection of contaminations. Numerous studies have shown ... [more ▼]

Among natural factors driving the soil content in metallic trace elements (MTE), the geochemical background is often deemed as a sound base for the detection of contaminations. Numerous studies have shown the difficulties to take into account the multi-dimensionnality of the spatial variability of most soil properties. As far as a detailed soil map is available for Belgium, the relevance of its information was investigated at various spatial scales in the Walloon Region (Southern Belgium), from the plot to the entire region, to evaluate the feasibility of a multi-scale mapping of geochemical background. The soil properties of 410 plots from the regional forest soil monitoring and the relationships with informations related to the physical environment (lithology, soil types...) were investigated through multivariate statistical analysis. Some processes of integration of point measurements and qualitative information were also explored. At the regional scale, some long-range spatial structures could be identified. These result mainly from the geological structure of the Walloon region, where the lithological zonation is rather clearly marked. The soil map (texture and nature of stone charge) appears relevant at that scale too but does need a generalization process and fails however to differenciate the intra-type soil spatial variability. [less ▲]

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See detailLes perturbateurs endocriniens et le monde agricole
Charlier, Corinne ULg

Conference (2009)

Detailed reference viewed: 16 (5 ULg)
Peer Reviewed
See detailLINKING CONTACT EMPLOYEE EMOTIONAL INTELLIGENCE TO CUSTOMER PERCEPTIONS
Delcourt, Cécile ULg; Van Riel, Allard ULg; Birgelen, Marcel

Conference (2009)

Contact employees play a critical role in creating favorable customer perceptions. We aim to understand to which extent contact employee emotional intelligence relates to customer perceptions of rapport ... [more ▼]

Contact employees play a critical role in creating favorable customer perceptions. We aim to understand to which extent contact employee emotional intelligence relates to customer perceptions of rapport, and their satisfaction and behavioral intentions. We developed a causal model and tested it with PLS. We found that customer perceptions of contact employee emotional intelligence influence their perceptions of rapport. In turn, rapport influences cognitive and emotional satisfaction. Both types of satisfaction lead to behavioral intentions. In order to improve customer perceptions of rapport, managers could focus on contact employees’ emotional intelligence when hiring and training them. [less ▲]

Detailed reference viewed: 121 (13 ULg)
See detailNarrative roles of the particle isT
Gillen, Todd Jonathan ULg

Conference (2009)

Detailed reference viewed: 6 (0 ULg)
See detailDevelopment of an active H maser: first results
Mandache, Cipriana ULg; Léonard, D.; Bastin, Thierry ULg

Conference (2009)

Detailed reference viewed: 35 (6 ULg)
Peer Reviewed
See detailHandling range ambiguities in registration-based range-dependence compensation for conformal array STAP
Ries, Philippe; Verly, Jacques ULg; Lapierre, Fabian D.

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailWerkt een muzikale opleiding de perceptie van prosodische prominentie in een vreemde taal in de hand?
Degrave, Pauline; Hiligsmann, Philippe; Rasier, Laurent ULg

Conference (2009)

Detailed reference viewed: 14 (0 ULg)
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See detailAchromatization of solar concentrator thanks to diffractive optics
Languy, Fabian ULg; Lenaerts, Cedric ULg; Loicq, Jerôme ULg et al

Conference (2009)

Refractive solar concentrators suffer from important chromatic aberration. To enhance solar cell performance and increase the concentrating ratio, we propose an hybrid (diffractive/refractive) lens which ... [more ▼]

Refractive solar concentrators suffer from important chromatic aberration. To enhance solar cell performance and increase the concentrating ratio, we propose an hybrid (diffractive/refractive) lens which allows a more uniform flux density and an achromatized (in the sense of achromatic doublet) illumination of the cell. To solve the problem of high diffraction efficiency, we turn to multilayer diffractive lenses to have broadband high diffraction efficiency optimized on solar spectrum. Rigorous coupled wave analysis simulations were performed in order to check the validity of scalar theory, they led to a new order of magnitude for the ratio period/wavelength which has been found to be around 100 in place of 10. [less ▲]

Detailed reference viewed: 191 (33 ULg)
See detailConséquences négatives de la présence d'antibiotiques dans les eaux usées lors de leur épuration par boues activées
Louvet, Jean-Noël ULg; Attik, Ghania; Dumas, Dominique et al

Conference (2009)

Detailed reference viewed: 8 (0 ULg)
See detailOrigin and early evolution of life
Javaux, Emmanuelle ULg

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
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See detaile-Demos, We'll Show You What We've Got !"
Lecomte, Béatrice ULg

Conference (2009)

Detailed reference viewed: 39 (17 ULg)
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See detailL'agriculture familiale africaine au coeur des Objectifs du Millénaire pour le Développement (OMD)
Berti, Fabio ULg; Lebailly, Philippe ULg

Conference (2009)

L’agriculture familiale africaine est concernée directement par l’Objectif 1 du Millénaire pour le Développement, de réduire de moitié d’ici 2015 l’extrême pauvreté et la faim. En effet, selon la plupart ... [more ▼]

L’agriculture familiale africaine est concernée directement par l’Objectif 1 du Millénaire pour le Développement, de réduire de moitié d’ici 2015 l’extrême pauvreté et la faim. En effet, selon la plupart des observateurs, 70% des pauvres sont localisés dans les zones rurales et sont agriculteurs. Dans ce contexte, il importe de s’interroger sur l’avenir des exploitations agricoles familiales en Afrique. Après avoir présenté la problématique générale de l’exploitation agricole familiale dans le développement, les auteurs présentent une analyse au départ des constats qu’ils ont pu réaliser, respectivement pour les filières de rente de la zone forestière au Cameroun et pour le coton, dans plusieurs pays d’Afrique de l’Ouest. Les analyses sont réalisées à partir des observations effectuées au départ de différentes études financées essentiellement par la Commission européenne au cours de ces dernières années. Il en résulte que le terme « agriculture familiale » recouvre des réalités très différentes avec une différenciation de plus en plus poussée des exploitations agricoles. Dans le même temps, il subsiste de nombreuses exploitations familiales plus « traditionnelles » mêlant des logiques d’autoconsommation et de marché avec des dotations en facteurs plus inégales et donc plus vulnérables. L’enjeu primordial des politiques agricoles qui seront définies sera précisément de prendre en considération la dimension spécifique de ce type d’exploitation, cible prioritaire dans la lutte contre la pauvreté. L’orientation des politiques mises en œuvre autour du seul objectif de la production de biens agricoles ne permettra pas de réduire les disparités internes et souvent croissantes observées. Il convient donc d’intégrer les dimensions sociales et environnementales dans les objectifs des politiques agricoles à mettre en œuvre. [less ▲]

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See detailErythromycin time-kill activity on activated sludge
Louvet, Jean-Noël ULg; Heliun, Yannick; Potier, Olivier et al

Conference (2009)

Detailed reference viewed: 10 (2 ULg)
See detailSaturn Auroral Images and Movies from Cassini UVIS
Pryor, Wayne; Esposito, L.W.; Stewart, A.I.F. et al

Conference (2009)

Cassini’s Ultraviolet Imaging Spectrograph (UVIS) has completed five years of study of Saturn’s atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and ... [more ▼]

Cassini’s Ultraviolet Imaging Spectrograph (UVIS) has completed five years of study of Saturn’s atmosphere and auroras. Two long slit spectral channels are used to obtain EUV data from 56.3-118.2 nm and FUV data from 111.5-191.3 nm. 64 spatial pixels along each slit are combined with slit motion to construct spectral images of Saturn. Auroral emissions are seen from electron-excited molecular and atomic hydrogen. In 2008-2009 UVIS obtained data with the spacecraft well out of Saturn’s ring plane, permitting UVIS to obtain a number of short movies of the rotating auroral structures. In some movies a cusp-like feature is present near noon inside the oval. One movie from 2008 day 201 shows parallel linear features on the day side almost at right angles to the main auroral oval that appear, then lengthen, separate in the middle, and then fade away. The same movie also shows one bright "polar flare" inside the oval. A few of the most recent images were obtained at sufficiently close range that 2 spacecraft slews were needed to completely cover the oval. These images provide almost 100 pixels of information across the oval and clearly show multiple arcs of emission on the main oval and scattered emissions inside the oval. We will discuss these features, their locations, and possible interpretations. We also report on a search for an Enceladus auroral footprint on Saturn. [less ▲]

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See detailRythmes biologiques et comportement animal.
Poncin, Pascal ULg

Conference (2009)

Detailed reference viewed: 14 (3 ULg)
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See detailThe role of the specific immune response on cecal colonization of slow-growing broiler chickens reared on litter contaminated by Campylobacter jejuni
Vandeplas, Sabrina ULg; Dubois Dauphin, Robin ULg; Beckers, Yves ULg et al

Conference (2009)

The aim of this experiment was to study the relation between the specific immune response and infection of slow-growing broiler chickens reared on straw litter contaminated by Campylobacter jejuni. The 11 ... [more ▼]

The aim of this experiment was to study the relation between the specific immune response and infection of slow-growing broiler chickens reared on straw litter contaminated by Campylobacter jejuni. The 11-weeks experiment was carried out in a 45 m2 broiler house with 500 chickens from 1 day of age, which had access to an open-air range. Litter contamination was performed before the setting up of the chicks by rearing campylobacter-positive cocks. These birds were also used to contaminate the open-air range during one week before the exit of the chickens, at 5 weeks of age. Blood samples were taken weekly on 20 chickens for anti-campylobacter IgG quantitative measurements on serum. Chickens were then euthanized and cecal contents and bile were collected for Campylobacter enumeration and anti-campylobacter IgA quantification, respectively. A high serum anti-campylobacter IgG titer of 110.13 was measured in one-day-old chicks. The IgG antibodies level significantly decreased to 5.60 at 28 days of age which coincided with the onset of Campylobacter infection in the flock. A significant reduction of the cecal colonization from 11 weeks of age was correlated with the increase in biliary IgA titers. These results suggest that the 2-3 week’s delay generally observed in poultry production before flock infection by Campylobacter may be, at least partly, explained by the protective effect of maternal antibodies. The increase of secretory immune response as bird age may help to limit Campylobacter population in the chicken gut. [less ▲]

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See detailQuel dispositif de formation pour un CDS ? Réflexions à partir de l’expérience de l’Académie Wallonie-Europe
Merenne-Schoumaker, Bernadette ULg; Leduc, Laurent ULg

Conference (2009)

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the ... [more ▼]

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the purpose of this article is to reflect on the specificities and constraints of a training limited to teachers in charge of First Generation students, those specificities being especially constraining since the CDS training sessions take place in a larger context : the training of all the university teachers. The Liege experience enlightens some determinant factors : sensitizing first on the interest of such a training, centring the training on close coaching of students learning with a focus on their difficulties or deficiencies and with help given to teachers in resolving them, meeting the diversity of the situations lived by those teachers (notably in terms of students number and disciplines), taking into account their expectations in accordance with their profile, cleverly combining oral speeches, testimonies and debates, suggesting a diversity of concrete intervention trails… By the way, the joined organization of introduction sessions and close coaching seminars seems to be a relevant formula in order to meet such kind of objectives. [less ▲]

Detailed reference viewed: 58 (10 ULg)
See detailTerritory knowledge (B1pc) - Discussion report
Breuer, Christophe ULg

Conference (2009)

Detailed reference viewed: 15 (0 ULg)
See detailApplication of a 3-D Super Ensemble to ocean forecast
Lenartz, Fabian ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg et al

Conference (2009)

Super Ensemble (SE) techniques have recently allowed improving the forecast of various important oceanographic parameters, such as the significant wave height, the speed of sound or the surface drift, by ... [more ▼]

Super Ensemble (SE) techniques have recently allowed improving the forecast of various important oceanographic parameters, such as the significant wave height, the speed of sound or the surface drift, by correcting the prediction at a single or multiple locations, where data were available during the whole training period. However, nowadays common observation systems, such as satellite imagery or drifters, do not always provide information at the exact same locations, hence it is necessary to generalize the approach in order to take benefit of every image or track available. In this study, we try and apply a SE, fed with remote sensing and gliders data, to 3-D hydrodynamic models. The basic idea on which rely the SE methods is that a certain combination of several model runs and possibly data could yield better results than just one single model, even if it has a higher temporal or spatial resolution. As the most efficient techniques are the ones using observations, they rapidly developed and increased in complexity by copying what had been done in the data assimilation community; getting from the simple ensemble mean of the model outputs to their linear combination based on a particle filter. In our present study, we have decided to use the Kalman filter (KF) as it alleviates the need of an a priori determination of the training period length, and does not require the run of a very large ensemble of members. In addition, we apply it in a 3-D framework in order to take benefit of the spatial information contained by each source of measurements. For example, satellite images of sea surface temperature (SST) are very useful to correct the value of this parameter, but depending on the structure of the water column, it can also give a precious guess of how warm or cold is the ocean at 20 m deep. In our experiment the domain of interest is the Ligurian Sea during the last week of September, when part of the set-up for the CalVal08 campaign (SiC Charles Trees) had already taken place. The data assimilated during the training of the filter are SST images from AVHRR, as well as temperature and salinity profiles from two Rutgers University gliders. The models used for the study are three nested models of NCOM, run without data assimilation. The two considered variables are the temperature and the salinity. As our method is designed to work in a multivariate way, salinity forecast can possibly be improved by observing temperature profiles. Statistics are computed for both the training and the testing periods with an independent set of data. In four test cases, we review the impact of both the nature of the assimilated data, and the formulation of the model covariance matrix. At the end, we show that, on the basis of previous model outputs from which we’ve drawn an estimate of the model covariance, RMS error of the forecast in the whole 3-D domain can be reduced by 30%, thanks to the only assimilation of satellite SST images. [less ▲]

Detailed reference viewed: 39 (5 ULg)
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See detailA revised carbon budget for the North Sea
Paetsch, J.; Kuehn, W.; Borges, Alberto ULg et al

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
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See detailSurvey of air-ice ocean carbon dioxyde exchange over arctic sea-ice
Heinesch, Bernard ULg; Aubinet, Marc ULg; Carnat, Gauthier et al

Conference (2009)

Detailed reference viewed: 23 (5 ULg)
See detailShort Course on Methof Validation
Boulanger, Bruno ULg; Hubert, Philippe ULg

Conference (2009)

Detailed reference viewed: 24 (2 ULg)
Peer Reviewed
See detailGeneration of total angular momentum eigenstates in remote qubits
Maser, A.; Schilling, U.; Bastin, Thierry ULg et al

Conference (2009)

Detailed reference viewed: 5 (1 ULg)
See detailPerturbations endocriniennes liées aux polluants environnementaux
Charlier, Corinne ULg

Conference (2009)

Detailed reference viewed: 34 (10 ULg)
See detailOnline assessment of the quality of care in elderly (Belgium)
Tancredi, A; Renard, Florence ULg; Degey, S et al

Conference (2009)

Detailed reference viewed: 14 (0 ULg)
See detailHet leerdercorpus Nederlands in theorie en in de praktijk
Perrez, Julien ULg; Degand, Liesbeth

Conference (2009)

Detailed reference viewed: 22 (0 ULg)
Peer Reviewed
See detailOn the use of posture verbs by French-speaking learners of Dutch : a corpus-based study.
Lemmens, Maarten; Perrez, Julien ULg

Conference (2009)

Detailed reference viewed: 4 (0 ULg)
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See detailAgroecology and the emergence of "Publics"
Stassart, Pierre M ULg

Conference (2009)

Detailed reference viewed: 17 (1 ULg)
See detailDiversité et limites de la vie
Wilmotte, Annick ULg; Javaux, Emmanuelle ULg

Conference (2009)

Detailed reference viewed: 2 (1 ULg)
See detailLe Dévonien: des mousses à l'arbre.
Gerrienne, Philippe ULg

Conference (2009)

Detailed reference viewed: 3 (0 ULg)
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See detailModerator : Prosthetic Session
Van Heusden, Alain ULg

Conference (2009)

Detailed reference viewed: 5 (1 ULg)
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See detailDo spiders capture attention in a bottom-up fashion and does fear have an impact?
Devue, Christel ULg; Belopolsky, Artem; Theeuwes, Jan

Conference (2009)

Fear-related stimuli (e.g. spiders) seem to be prioritized during visual selection when they are actively searched for. This is especially true if the observers fear them. It remains unclear whether such ... [more ▼]

Fear-related stimuli (e.g. spiders) seem to be prioritized during visual selection when they are actively searched for. This is especially true if the observers fear them. It remains unclear whether such stimuli capture attention automatically when they are task-irrelevant. To answer that question, we used the additional singleton paradigm (Theeuwes, 1992) in which participants searched for a shape singleton (a circle among diamonds) while a fear-related stimulus (a spider) or a fear-unrelated stimulus (a butterfly) was also present in the display. To assess whether fear affects the extent of a possible bottom-up capture, we compared performance of participants that scored high or low on the Fear of Spiders Questionnaire (Szymanski & O'Donohue, 1995). Results showed that both types of task-irrelevant animals captured covert attention. Importantly, both types of animals produced larger interference in high-fear than in low-fear participants. This study suggests that fear as an individual characteristic influences bottom-up capture. [less ▲]

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See detailDetection et analyse des patines intentionelles des bronzes antiques : apport des IBA en faisceau extrait
Mathis, François ULg; Salomon, Joseph; Pichon, Laurent et al

Conference (2009)

Detailed reference viewed: 10 (0 ULg)
See detailLes premières plantes terrestres (Embryophytes) : origine et diversification - deuxième partie.
Gonez, Paul ULg; Prestianni, Cyrille ULg; Strullu-Derrien, Marie-Christine et al

Conference (2009)

Detailed reference viewed: 34 (1 ULg)
Peer Reviewed
See detailGeneration of Long-lived Entanglement on Demand in Remote Qubits
Schilling, U.; Thiel, C.; Bastin, Thierry ULg et al

Conference (2009)

Detailed reference viewed: 8 (2 ULg)
See detailSports, identities and governance
Tuñón, Jorge; Brey, Elisa ULg

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
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See detailApplications of 3D visualization in science and engineering
Burrus, Nicolas; Hoyoux, Thomas; Verly, Jacques ULg

Conference (2009)

Detailed reference viewed: 13 (2 ULg)
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See detailGlance on preliminary nutritional data ORISCAV-LUX Survey
Alkerwi; Guillaume, Michèle ULg

Conference (2009)

Detailed reference viewed: 7 (1 ULg)
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See detailAcidity in Ionic liquids: from the determination of an acidity scale to the application in catalytic reactions
Olivier-Bourbigou, Hélène; Gilbert, Bernard ULg; Magna, Lionel et al

Conference (2009)

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See detailThe use of time use surveys to study activity participation: emerging issues
Cools, Mario ULg; Moons, Elke; Wets, Geert

Conference (2009)

Time use surveys often are carried out to identify, classify and quantify social behaviour of people by focusing on the activities that people perform. Time use data, in the transportation field often ... [more ▼]

Time use surveys often are carried out to identify, classify and quantify social behaviour of people by focusing on the activities that people perform. Time use data, in the transportation field often referred to as activity-based data, can be used to study a variety of sociological, economic, and technological phenomena. Studying behaviour, social networks and transport patterns are a few of the topics that can be analysed based on these time use data. This first introductory paper discusses some emerging issues in the collection of travel-related data such as automatic spatial information recording using cell phones and GPS, and survey design experiences. On the one hand new technology offers the opportunity to record at a relative low cost a wide variety of the data, while on the other hand new problems occur. One of such problems for instance is the problems of ‘cold starts’ faced with GPS devices, clouding the first minutes of recording after each restart of the device after it was turned off completely. Notwithstanding, applications of new technologies offer the opportunity for performing detailed space-time analyses in different fields ranging from epidemiology to transportation science. Some of these applications are highlighted in this session. Next to the advantages and potential risks of new technologies, this introductory paper also discusses the combination of different modes to analyze space-time behaviour. In particular, this study investigates potential mixed mode design effects, observed in a large activity-based travel survey, using a PDA application on the one hand, and traditional paper and pencil diaries on the other hand. The mixed-mode effects are analysed using heteroscedastic linear regression models, taking into account not only mode-effects, but also potential fatigue-effects. The results show that in this mixed-mode survey no attrition effects are present, and that the survey mode (PDA versus paper and pencil) has no direct impact on the quantities investigated (number of out-of-home activities reported and number of trips). [less ▲]

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See detailAnalyse de bijoux mérovingiens en Belgique
Mathis, François ULg; Othmane, Guillaume; Vrielynck, Olivier

Conference (2009)

Detailed reference viewed: 13 (2 ULg)
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See detailElectrical resistivyt tomography as tool to image preferential flow pathways in soils
Kasteel, Roy; Garré, Sarah ULg; Koestel, Johannes et al

Conference (2009)

Detailed reference viewed: 11 (2 ULg)
See detailComa, consciousness and the brain
Noirhomme, Quentin ULg

Conference (2009)

Detailed reference viewed: 7 (1 ULg)