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See detailGlaciaçoes Eocarboniferas nas bacias do Norte do Brazil.
Caputo, M.V.; Streel, Maurice ULg; Melo, H.G. et al

in Simposio da Amazonias (2006)

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See detailGlaciaçoes neodevonianas E Eocarboniferas na America do sul.
Caputo, M.V.; Streel, Maurice ULg; Melo, H.G. et al

in Simposio da Amazonias (2006)

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See detailRegular events in travel behaviour research: setup of a longitudinal websurvey
Cools, Mario ULg; Moons, Elke; Wets, Geert

Conference (2006)

One of the leading paradigms in modern travel behaviour research is the activity based approach, which considers travel as a derivative from the activities that individuals and households need or wish to ... [more ▼]

One of the leading paradigms in modern travel behaviour research is the activity based approach, which considers travel as a derivative from the activities that individuals and households need or wish to perform. Longitudinal designs provide the required framework for a better understanding of the dynamics of travel behaviour. Longitudinal data can be used to analyze behavioural adjustments some time before (response leads) or after (response lags) the occurrence of an event, or for instance to analyze routine behaviour. The questionnaire used to collect the data will be an activity diary. The respondents are asked to fill in all their activities performed that day. The diaries have to be filled in at least twice a week. These moments are randomly selected, but in weeks when a special event occurs, the days around this special event are questioned as well. Performing a longitudinal study has certain drawbacks however. The respondent burden can cause different side-effects, such as panel attrition, decreasing representativeness and, reporting errors. Thus, next to refreshing the sample regularly, trying to keep the respondents motivated is essential. A first step in lowering the respondent burden is to make the activity diaries user-friendly. An internetbased questionnaire makes interaction with respondents possible. The respondent’s current results can be graphically displayed (e.g. geographical map of activity-pattern), potentially awakening or strengthening the interest in the study. Logical rules (e.g. two activities on two different locations require a trip in between) can be formulated, and the interaction with the respondents allows the researcher to get feedback on “strange” answers, or on missing values, thus improving the data quality. This paper describes some potential paths to minimise sample attrition (e.g. internet-based interaction with respondents) and ways to refresh the sample. These findings are applied to the study of travel behaviour of Flemish households around school holidays. [less ▲]

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See detailQuantitative analysis of atmosphere by laser—induced breakdown spectroscopy
Yu, Liangying; Lu, Jidong; Chen, Wen et al

in Journal of Applied Optics (2006), 27(2), 147-151

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric ... [more ▼]

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy, plasmas were produced by a Q—switched Nd :YAG laser interacted with the air at atmospheric pressure,then the light of plasmas entered the monochrom eter and transferred into an electric signal,and the spectra of these plasmas in the range of 600~ 800 nm were stored and analyzed by the calibration—free mode1.Under the condition of delay time of 8 s and gating pulse of 0.4 s,the temperature of plasmas,which was in local thermal equilibrium (LTE),was 1.62× 10 K which was obtained by means of the two—dimensional Boltzmann plane.The 20.75 oxygen content and 79.25%nitrogen content in air were detected on the assum ption that there were only oxygen and nitrogen constituents in the air.The results coincide well with the fact.The feasibility was validated by the experiment,and it built a strong basis for the further study and experiment of air pollutant monitoring. [less ▲]

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See detailInfluence of coal characteristics on laser-induced plasmas
Chen, Wen; Lu, Jidong; Yu, Liangying et al

in Journal of Applied Optics (2006), 27(3), 216-219

Eight kinds of typical coal samples were chosen for studying the influence of coal characteristics on laser—induced plasmas.Element analysis and industry analysis were carried out for every ... [more ▼]

Eight kinds of typical coal samples were chosen for studying the influence of coal characteristics on laser—induced plasmas.Element analysis and industry analysis were carried out for every sample.Experimental study on the interaction between laser and different coal samples was completed,and factors affecting laser plasma were analyzed,such as coal moisture and coal dust.The experiment result indicates that the coal samples with different coalification degrees have different plasma time—resolved spectral characteristics,all of them tend to rise at the beginning of plasma formation (< 1us),then with the decay of plasmas emission.they tend to decrease in about 1us,while secondary ionization occurs in highly coalificated coals after 2 us.The plasma temperature differs from one kind to another,the higher the coalification degree is,the higher the plasma temperature will be. [less ▲]

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See detailNumerical simulation of NO formation in cement rotary kiln
Wang, Shijie; Lu, Jidong; Li, Weijie et al

in Journal of Chemical Industry and Engineering(China) (2006), 57(11), 2631-2637

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See detailContrasting responses of saproxylic insects to focal habitat resources: The example of longhorn beetles and hoverflies in Belgian deciduous forests
Fayt, P.; Dufrêne, Marc ULg; Branquart, E. et al

in Journal of Insect Conservation (2006), 10(2), 129-150

Although both saproxylic longhorn beetles and hoverflies benefit from the presence of woody substrates for reproduction, they differ in their requirements for floral resources and for microbiotopes of ... [more ▼]

Although both saproxylic longhorn beetles and hoverflies benefit from the presence of woody substrates for reproduction, they differ in their requirements for floral resources and for microbiotopes of overmature and senescent trees. This led us to expect contrasting responses between the two species groups in relation to these essential resources. We examined this prediction in 22 mature oak- and beech-dominated stands of southern Belgium by relating their species assemblages to local vegetation structure and composition, altitude and landscape composition. Stands were organised in pairs as a function of their overall dead wood supply. Free-hanging window traps, stump emergence traps and Malaise traps produced 30 longhorn beetle species (1637 individuals) and 106 hoverfly species (3020 individuals). Paired-comparisons controlling for annual variation in captures showed that, unlike saproxylic hoverflies, stands with dead wood hosted more species and individuals of longhorn beetles. Accordingly, the two species groups were found to be independent on ordination axes, responding to different sets of environmental conditions. While stands dominated by oaks with a high snag volume were highly favoured by longhorn beetles, saproxylic and threatened syrphids were limited to open-stands with large trees and a well-developed, species rich herb layer providing the floral resources required for their reproduction. Our results suggest that, when defining criteria to identify or restore important habitats for saproxylic insect conservation, variables related to different aspects of dead wood supply should not be the only criteria taken into account. © Springer 2006. [less ▲]

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See detailL'érosion de la biodiversité: les carabides. Etat de l'Environnement wallon
Dufrêne, Marc ULg; Desender, Konjev

Report (2006)

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See detailCompte rendu e Erwin SONDEREGGER, "Proklos. Grundkurs über Einheit. Grundzüge der neuplatonischen Welt"
Gavray, Marc-Antoine ULg

in Revue Philosophique de Louvain (2006), (1), 216-218

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See detailNumerical modelling of coupled poromechanics processes
Charlier, Robert ULg; Laloui, Liesse; Collin, Frédéric ULg

in Revue Européenne de Génie Civil (2006), 10(6-7), 669-702

This paper is the basis for a course dedicated to geomechanics for energy production. A number of different coupling are discussed, with respectively the fluid flow (saturated and unsaturated) and the ... [more ▼]

This paper is the basis for a course dedicated to geomechanics for energy production. A number of different coupling are discussed, with respectively the fluid flow (saturated and unsaturated) and the thermal transfers in deformable porous media. Eventually some aspects on the numerical modelling with the finite element method are discussed. [less ▲]

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See detailQuand l'écriture devient texture de l'image
Dondero, Maria Giulia ULg

in Visible (2006), 2

Cet article porte sur un corpus de photographies écrites et peintes et concerne les relations (contractuelles et contrastives) entre texte photographique, écriture manuelle et gestualité picturale ... [more ▼]

Cet article porte sur un corpus de photographies écrites et peintes et concerne les relations (contractuelles et contrastives) entre texte photographique, écriture manuelle et gestualité picturale. L’écriture dans l’image est étudiée comme : 1) stratégie d’authentification de l’objet-photo (autographie de l’objet photographique unique), 2) comme notation, 3) comme gestualité, 4) comme effet-texture de l’image. L’écriture entendue comme stratégie d’authentification du texte photographique permet de réfléchir sur la problématique de l’original, de la reproductibilité et du statut hybride de la photographie écrite, à mi-chemin entre autographie et allographie (« texte autographique à objet multiple »). [less ▲]

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See detailComparative responses to sodium selenite and Sel-Plex® organic selenium supplements in Belgian Blue cows and calves
Guyot, Hugues ULg; Rollin, Frédéric ULg; Andrieu, Sylvie et al

in Nutritional Biotechnology in the Feed and Food Industries (Alltech’s 22nd Annual Symposium) (2006)

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See detailDéfense végétale, biotechnologies et développement de bio-insecticides
Francis, Frédéric ULg; Blecker, Christophe ULg; Deroanne, Claude et al

in Abstract book (2006)

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See detailContributions possibles des innovations genetiques pour l'amelioration de la competitivite des filieres cotonnieres africaines.
Mergeai, Guy ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2006), 10(4), 345-350

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See detailCrop yield forecast with NOAA and spot-vegetation data in Morocco.
Balaghi, Riad; Tychon, Bernard ULg; Eerens, H. et al

Conference (2006)

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See detailCollective optimization over average quantities
Scardovi, Luca; Sepulchre, Rodolphe ULg

in Proceedings of the 45th IEEE Conference on Decision and Control (2006)

This paper addresses the design of algorithms for the collective optimization of a cost function defined over average quantities in the presence of limited communication. We argue that several meaningful ... [more ▼]

This paper addresses the design of algorithms for the collective optimization of a cost function defined over average quantities in the presence of limited communication. We argue that several meaningful collective optimization problems can be formulated in this way. As an application of the proposed approach, we propose a novel algorithm that achieves synchronization or balancing in phase models of coupled oscillators under mild connectedness assumptions on the (possibly time-varying and unidirectional) communication graphs. [less ▲]

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See detailOne year follow-up of ankle-brachial blood pressure index in hemodialized patients
Saint-Remy, Annie ULg; Sumaili, Ernest; Dubois, Bernard ULg et al

in Kidney & Blood Pressure Research (2006), 29

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