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See detailPsychopathologie et phénoménologie : autour d’Eugen Minkowski
Cormann, Grégory ULg

Conference (2007, May 09)

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See detailAnglophones et Québécois, Flamands et Francophones : La répartition du pouvoir au sein du gouvernement belge et canadien
Reuchamps, Min ULg

Conference (2007, May 03)

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of ... [more ▼]

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of Daniel Elazar’s seminal work on federalism in plural societies and of Arend Lijphart’s on consociationalism offers a theoretical framework which can be usefully applied to study the distribution of power between the two main ethno-linguistic communities at the highest level of the state. Using the existing “model of points” and the author’s own “model of the weight of ministerial portfolios”, this paper explores the linguistic composition of the federal governments in both countries over the last thirty years (1970-2006). Whereas the Belgian Constitution has required since 1970 that the federal cabinet be staffed by an equal number of Flemish and Francophone ministers, the Canadian Constitution does not require such a linguistic parity and therefore leaves a greater freedom for the composition of the government. On this background, two logics may explain the linguistic composition in the two cases: a logic of transaction between the two main communities and a logic of representation. The paper opens, on the one hand, with the elaboration of the theoretical framework combining the works of Elazar and Lijphart and, on the other hand, with the construction of the two models. The framework and the models are applied to each case, emphasizing the logic of transaction and the logic of representation. On the basis of this examination, this paper concludes by suggesting that Flemish and Francophone Belgians as well and English and French Canadians benefit from the composition of the federal cabinet. The conclusion opens—new—ways and means to hinder political tensions in plural societies through the institutional arrangement. [less ▲]

Detailed reference viewed: 145 (9 ULg)
See detailEffect of the sowing date on physicochemical and fonctional properties of native starches extracted from European soft wheat (Triticum aestivum L.)
Lenartz, Jonathan; Massaux, Carine; Fernandez Pierna, J. A. et al

Conference (2007, May 02)

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See detailNatural and projectively equivariant quantizations
Radoux, Fabian ULg

Conference (2007, May 01)

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See detailRestructuring and territorial governance: the contribution of actor-network theory
Antoine, Mélanie ULg; Dalon, Gelica

Conference (2007, May)

The aim of this paper is to shed light, in an exploratory manner, on the role of the choices made in terms of governance in reorganisation projects initiated on territories affected by companies ... [more ▼]

The aim of this paper is to shed light, in an exploratory manner, on the role of the choices made in terms of governance in reorganisation projects initiated on territories affected by companies' restructuring. Actor-network theory is used to analyse the dynamics present on three territories concerned by the restructuring of a same company. It allows to identify the strengths and weaknesses of the territorial reorganisation's modes of management and to highlight their decisive influence on the evolution of the projects. [less ▲]

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See detail3D image analysis of electron tomograms of clay/rubber nanocomposites
Gommes, Cédric ULg; Bons, A-J; BLACHER, Silvia ULg

Conference (2007, May)

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See detailL'enchaînement des facteurs de défaillance de l'entreprise : une réconciliation des approches organisationnelles et financières
Crutzen, Nathalie ULg; Van Caillie, Didier ULg

Conference (2007, May)

The aim of this paper is to gather the findings from the multiple studies focused on the identification of failure paths, in order to propose an unifying model showing the chronological combination of the ... [more ▼]

The aim of this paper is to gather the findings from the multiple studies focused on the identification of failure paths, in order to propose an unifying model showing the chronological combination of the diverse factors leading a company to bankruptcy. An in-depth analysis of the existing literature and of its limitations leads to the elaboration of an original model presenting the different phases through which a company goes by in its evolution towards its juridical failure. Moreover this model emphasizes the fact that all companies do not follow the same paths before they disappear (Argenti, 1976). [less ▲]

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See detailTopology optimization of microbeams including layer deposition manufacturing constraints
Lemaire, Etienne ULg; Rochus, Véronique; Fleury, Claude et al

Conference (2007, May)

As many manufacturing techniques, microfabrication methods possess limitations. Consequently, manufacturing constraints have to be considered during microsystems design process. Therefore, the direct use ... [more ▼]

As many manufacturing techniques, microfabrication methods possess limitations. Consequently, manufacturing constraints have to be considered during microsystems design process. Therefore, the direct use of automatic design tools like topology optimization is not possible. For instance, optimal topologies generally contain closed cavities that cannot be produced using the usual microfabrication techniques like layer deposition. The present paper intends to add a layer deposition constraint to the optimization problem using recent developments of CONLIN software. However, with this new optimization procedure we could observe that classical sensitivities filtering makes optimization problem rather unstable while filtering the density field itself keeps good convergence properties. [less ▲]

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See detailSuccess and failure factors for stress management interventions: Survey of Belgian companies
Barbier, Marie ULg; Peters, Stéphanie ULg; Hansez, Isabelle ULg

Conference (2007, May)

Stress at work has become a major problematic in Europe this last decade. Several methods for diagnosis and intervention can be listed. In this context, an examination of interventions taking place in ... [more ▼]

Stress at work has become a major problematic in Europe this last decade. Several methods for diagnosis and intervention can be listed. In this context, an examination of interventions taking place in companies is necessary: what are the reasons for implementing stress prevention programmes (SPP)? Which ones are the most frequent? What are the success and failure factors for implementing SPP? In order to answer those questions, a large scale survey was implemented in Belgian companies (N=210). Results show that a) companies mainly use diagnosis to fulfil legal obligation, b) psychosocial risk assessments are less implemented in small companies (less than 50 workers), c) interventions are rarely systematically evaluated, d) most interventions target work environment, and specifically organisational (rather than ergonomic) outcomes, and e) communication/participation and methodological outcomes facilitate implementation of intervention, whereas changes and time/finances outcomes are blocking factors. To conclude, we can say that our survey emphasizes the relevance of public-awareness campaign (particularly towards small companies) about the necessity of implementing stress prevention program and of proceeding to systematic evaluation of such program. Public-awareness campaign is also needed concerning the impact of facilitating outcomes such as communication, participation and methodology, and of blocking outcomes such as organizational changes, time constraints and costs. Theoretically speaking, our study stresses first the prevalence of work-related interventions that are organisational rather than ergonomic or individual. Another point rather new regarding the existing literature is the blocking aspect of organizational changes. [less ▲]

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See detailThird Millennium Pottery from Terqa : Preliminary Results
Mas, Juliette ULg

Conference (2007, May)

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See detailFormer des enseignants efficaces et équitables : un nouveau défi
Beckers, Jacqueline ULg; Monville, Bertrand

Conference (2007, May)

Detailed reference viewed: 39 (5 ULg)
See detailEndogenous mode of competition in general equilibrium
Tharakan, Joseph ULg

Conference (2007, May)

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See detailAbstract numeration systems
Charlier, Emilie ULg

Conference (2007, May)

In this talk, I will introduce abstract numeration systems in general and present some results I have regarding operation preserving regularity. In particular, I will focus on multiplication by a constant.

Detailed reference viewed: 8 (1 ULg)
See detailPlurilinguisme et enseignement des langues
Defays, Jean-Marc ULg

Conference (2007, May)

Detailed reference viewed: 9 (3 ULg)
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See detailRow by row simulation of heat recovery steam generators : comparing different types of initialization as well as the LMTD and ε-NTU simulation method
Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

Conference (2007, May)

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness ... [more ▼]

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness-number of transfer unit. These approaches are compared in term of results and speed of calculation. We also present the difficulties encountered and some means of circumventing them. Some cases of superheater are treated in order to illustrate our matter. [less ▲]

Detailed reference viewed: 23 (11 ULg)
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See detailTetanus in the horse
Van Galen, Gaby ULg; Amory, Hélène ULg

Conference (2007, April 28)

Detailed reference viewed: 19 (1 ULg)
See detailPhotodetachment and Photodissociation Mass Spectrometry of Biomolecule Ions
Gabelica, Valérie ULg

Conference (2007, April 27)

We recently explored the effects of irradiating DNA polyanions stored in a quadrupole ion trap (QIT) mass spectrometer with an optical parametric oscillator (OPO) laser between 250 nm and 285 nm. We ... [more ▼]

We recently explored the effects of irradiating DNA polyanions stored in a quadrupole ion trap (QIT) mass spectrometer with an optical parametric oscillator (OPO) laser between 250 nm and 285 nm. We studied DNA 6-mer to 20-mer single strands, and 12-base pair double strands. In all cases, laser irradiation causes electron detachment from the multiply charged DNA anions. Electron photo-detachment efficiency directly depends on the number of guanines in the strand, and maximum efficiency is observed between 260 and 275 nm. Collisional activation of the radical anions results in extensive fragmentation, which can be used to sequence the DNA strands. It has therefore important potential applications in analytical chemistry. We also obtained preliminary results on laser irradiation of DNA coupled to other chromophores (covalently bound or noncovalently bound). Depending on the chromophore, three different behaviors are encountered: (1) the photon energy can be redistributed in the molecule by internal conversion, (2) electron photodetachment was observed for a few chromophores, and (3) specific photodissociation was observed for a porphyrin chromophore. Here we will address the question of the mechanism of electron photodetachment. DNA multiply charged anions undergo one-photon electron ejection (oxidation) when subjected to laser irradiation at 260 nm (4.77 eV). Electron photodetachment is likely a fast process, given that photodetachment is able to compete with internal conversion and/or radiative relaxation to the ground state. The DNA [6-mer]3- ions studied here show a marked sequence-dependence of electron photodetachment yield. Remarkably, the photodetachment yield (dG6 > dA6 > dC6 > dT6) is inversely correlated with the base ionization potentials (G < A < C < T). Sequences with guanine runs show increased photodetachment yield as the number of guanine increases, in line with the fact that positive holes are the most stable in guanine runs. This correlation between photodetachment yield and the stability of the base radical may be explained by tunneling of the electron through the repulsive Coulomb barrier. The wavelength-dependence of electron detachment yield was studied for dG63-. Maximum electron photodetachment is observed in the wavelength range corresponding to base absorption (260-270 nm). This demonstrates the feasibility of gas-phase UV spectroscopy on large DNA anions. The calculations and the wavelength dependence suggest that the electron photodetachment is initiated at the bases and not at the phosphates. This also indicates that, although direct photodetachment could also occur, autodetachment from excited states, presumably corresponding to base excitation, is the dominant process at 260 nm. Excited states dynamics of large DNA strands still remains largely unexplored, and photo-oxidation studies on trapped DNA multiply charged anions can help bridging the gap between gas-phase studies on isolated bases or base pairs and solution-phase studies on full DNA strands. Time-resolved measurements on photodetachment and photodissociation can be used to contribute elucidating the mechanisms at stake in these novel experiments. [less ▲]

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See detailEnglish and French Canadians, Flemish and Francophone Belgians. The Linguistic Composition of the Canadian and Belgian Federal Cabinet
Reuchamps, Min ULg

Conference (2007, April 27)

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of ... [more ▼]

In divided societies, such as Belgium and Canada, the federal principle and consociational power-sharing have been implemented in order to accommodate ethno-linguistic communities. The combination of Daniel Elazar’s seminal work on federalism in plural societies and of Arend Lijphart’s on consociationalism offers a theoretical framework which can be usefully applied to study the distribution of power between the two main ethno-linguistic communities at the highest level of the state. Using the existing “model of points” and the author’s own “model of the weight of ministerial portfolios”, this paper explores the linguistic composition of the federal governments in both countries over the last thirty years (1970-2006). Whereas the Belgian Constitution has required since 1970 that the federal cabinet be staffed by an equal number of Flemish and Francophone ministers, the Canadian Constitution does not require such a linguistic parity and therefore leaves a greater freedom for the composition of the government. On this background, two logics may explain the linguistic composition in the two cases: a logic of transaction between the two main communities and a logic of representation. The paper opens, on the one hand, with the elaboration of the theoretical framework combining the works of Elazar and Lijphart and, on the other hand, with the construction of the two models. The framework and the models are applied to each case, emphasizing the logic of transaction and the logic of representation. On the basis of this examination, this paper concludes by suggesting that Flemish and Francophone Belgians as well and English and French Canadians benefit from the composition of the federal cabinet. The conclusion opens—new—ways and means to hinder political tensions in plural societies through the institutional arrangement. [less ▲]

Detailed reference viewed: 36 (4 ULg)
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See detailLa place du corps dans les théories de la réception littéraire
Vandeninden, Elise ULg

Conference (2007, April 26)

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See detailRückblenden - Junge deutsche Autoren erzählen Geschichte.
Viehöver, Vera ULg

Conference (2007, April 25)

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See detailWheat starch variability in characteristics and rheological properties: the influence of varieties, harvest years and phytotechnique
Sinnaeve, Georges; Paridaens, A. M.; Massaux, Carine et al

Conference (2007, April 25)

Detailed reference viewed: 10 (0 ULg)
See detailEtude longitudinale d’essais multilocaux : apports du modèle mixte
Brostaux, Yves ULg

Conference (2007, April 25)

Detailed reference viewed: 21 (3 ULg)
See detailModeling the influence of the Greenland ice sheet melting on the Atlantic meridional overturning circulation during the next millennia
Fichefet, Thierry; Driesschaert, Emmanuelle; Goosse, Hugues et al

Conference (2007, April 19)

A three-dimensional Earth system model of intermediate complexity including a dynamic ice sheet component has been used to investigate the long-term evolution of the Greenland ice sheet and its effects on ... [more ▼]

A three-dimensional Earth system model of intermediate complexity including a dynamic ice sheet component has been used to investigate the long-term evolution of the Greenland ice sheet and its effects on the Atlantic meridional overturning circulation (AMOC) in response to a range of stabilized anthropogenic forcings. Our results suggest that the Greenland ice sheet volume should experience a significant decrease in the future. For a radiative forcing exceeding 7.5 W m-2, the modeled ice sheet melts away within 3000 years. A number of feedbacks operate during this deglaciation, implying a strong non-linear relationship between the radiative forcing and the melting rate. In the most extreme scenario considered, the freshwater flux from Greenland into the surrounding oceans is higher than 0.1 Sv during a few centuries. This is however insufficient to induce a shutdown of the AMOC in the model. [less ▲]

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See detailSynthèse et clôture du séminaire
Halleux, Jean-Marie ULg

Conference (2007, April 19)

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See detailExemple d'étude hydrogéologique d'un système rivière-aquifère: Flémalle test site
Batlle-Aguilar, Jordi; Brouyère, Serge ULg

Conference (2007, April 18)

Cette présentation des investigations menées pour quantifier les échanges nappe - rivière au droit d'une friche industrielle fortement contaminée

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See detailLa Méthode de Dilution Ponctuelle avec Volume Fini de Traceur (FVPDM): une nouvelle technique de traçage pour le monitoring des flux de Darcy
Brouyère, Serge ULg; Batlle-Aguilar

Conference (2007, April 18)

Cette présentation décrit les principe de la technique de traçage puits unique FVPDM

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See detailReconstruction of the 1979-2005 Greenland ice sheet surface mass balance using satellite data and the regional climate model MAR
Fettweis, Xavier ULg

Conference (2007, April 17)

In order to improve our knowledge on the current state and variability of the Greenland ice sheet surface mass balance (SMB), a 27-year simulation (1979-2005) has been performed with the coupled ... [more ▼]

In order to improve our knowledge on the current state and variability of the Greenland ice sheet surface mass balance (SMB), a 27-year simulation (1979-2005) has been performed with the coupled atmosphere-snow regional model MAR. This simulation reveals an increase in the main factors of the SMB which are, on the one hand, the snowfall (+ 1.0 ± 1.5 km^3 yr^-2, not significant) in winter and on the other hand, the run-off of the melt water (+ 5.3 ± 3.0 km^3 yr^-2, significant) in summer. The net effect of these two competing factors leads to a SMB loss rate of – 4.1 ± 4.1 km^3 yr^-2, which has a significance of 95%. The melt extent derived from the passive microwave satellite data since 1979 also shows the acceleration of the surface melt. The contribution of changes in the net water vapour fluxes to the SMB variability is negligible. The melt water supply has increased because the Greenland ice sheet has been warming up by + 0.08 ± 0.04 °C yr^-1 since 1979. Latent heat flux, sensible heat flux and net solar radiation have not varied significantly over the last three decades. However, the simulated summer downward infra-red flux has increased by 7.1 W m^-2 since 1979. The natural climate variability (e.g. the North Atlantic Oscillation) does not fully explain these changes on the Greenland ice sheet. These changes result very likely from the global warming induced by human activities. The increase of +137 km^3 in the melt water run-off in the period 1979-2005 suggests that the overall ice sheet mass balance has been increasingly negative, given the observed melt-induced outlet glacier acceleration. [less ▲]

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See detailDiscontinuity in Jupiter's main auroral oval
Radioti, Aikaterini ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2007, April 15)

Detailed reference viewed: 1 (0 ULg)
See detailBiogeochemistry of a late marginal coccolithophorid bloom in the Bay of Biscay
Harlay, Jérôme ULg; de Bodt, Caroline; d'Hoop, Quentin et al

Conference (2007, April 15)

Coccolithophores, among which Emiliania huxleyi (Ehux) is the most abundant and widespread species, are the dominant calcifying phytoplankton in the temperate zone of the world’s oceans. Within the ... [more ▼]

Coccolithophores, among which Emiliania huxleyi (Ehux) is the most abundant and widespread species, are the dominant calcifying phytoplankton in the temperate zone of the world’s oceans. Within the framework of the “Climate and Atmosphere” Belgian Federal Science Policy Office programme, the continental margin of the Northern Bay of Biscay (North Atlantic Ocean) was visited in June 2006 during a multidisciplinary investigation of a late-spring bloom dominated by Ehux. Field sampling was assisted by daily transmission to the RV Belgica of remote sensing images, indicating the bloom development in the area. Various stations on the shelf and the shelf-break were sampled for the vertical distributions of nutrients, Transparent Exopolymer Particles (TEP), chlorophyll-a and particulate carbon concentrations. These data will be presented, here, in relation with 14C based integrated primary production, dissolved esterase activity and the bacterial community structure to emphasize the importance of coccolithophorid blooms in the biogeochemistry of the Northern Atlantic’s continental shelf. [less ▲]

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See detailForme e scenari di perdizione nella poesia di Sbarbaro e Caproni
Benzoni, Pietro ULg

Conference (2007, April 12)

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See detailL'effort cognitif
Adam, Stéphane ULg

Conference (2007, April 11)

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See detailTowards an integrated methodology for groundwater protection
Brouyère, Serge ULg; Popescu, Ileana Cristina ULg

Conference (2007, April 11)

This presentation reviews different aspects of groundwater pollution and protection to try to identify guidelines for an integrated approach for groundwater protection and management

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See detailTowards the identification of critical stages in the failure path : a longitudinal approach amongst Belgian SMEs
Van Caillie, Didier ULg; Crutzen, Nathalie ULg

Conference (2007, April)

During the last seven decades, business failure has been one of the most investigated topic in the accounting literature . However, most of this literature is focused either on a prediction perspective ... [more ▼]

During the last seven decades, business failure has been one of the most investigated topic in the accounting literature . However, most of this literature is focused either on a prediction perspective considered in a credit-risk management perspective or on a purely technical perspective allowing to test the ability of some new statistical or mathematical technique to correctly predict a potential failure (Morris, 1997). Simultaneously, relatively few attention has been paid to the identification of typical failure paths allowing to understand how a company may decline and allowing then to interfere with this process to really prevent such a final bankruptcy. (Laitinen, 1995). In this paper, we analyse financial statements published by 11 800 Belgian SMEs that were active during the period 1995 – 2003 ; for each of them, we estimate the Legal Failure Risk that characterizes their financial statements (this indicator is built by integrating the two financial aspects effectively taken into account by the Belgian Business Law to define a legal bankruptcy, i.e. unsolvency and illiquidity ) and we analyze how this indicator evolves over a long period and which are the other financial aspects (in terms of value added, profitability, financial structure and assets structure) that provoke such an evolution. As a result, we are able to isolate seven typical patterns of evolution amongst failing Belgian SMEs and we are able to describe, for each year and up to seven years before a fatal deterioration, the financial pattern of deterioration in which they are engaged. These results are obtained by implementing a specific statistical approach, essentially based on a mix of cluster analysis on longitudinal data and of correspondence analysis on the same data. [less ▲]

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See detailThird Millennium Terqa (ME-035)
Mas, Juliette ULg

Conference (2007, April)

Detailed reference viewed: 10 (2 ULg)
See detailCharacterization of dried banana chips quality by X-ray µ-CT
Léonard, Angélique ULg; Nimmol, Chatchai; Blacher, Silvia ULg et al

Conference (2007, April)

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See detailStructural properties of bounded languages with respect to multiplication by a constant
Charlier, Emilie ULg

Conference (2007, April)

Generalizations of positional number systems in which N is recognizable by finite automata are obtained by describing an arbitrary infinite regular language according to the genealogical ordering. More ... [more ▼]

Generalizations of positional number systems in which N is recognizable by finite automata are obtained by describing an arbitrary infinite regular language according to the genealogical ordering. More precisely, an abstract numeration system is a triple S = (L, Σ, <) where L is an infinite language over the totally ordered alphabet (Σ, <). Enumerating the elements of L genealogically with respect to < leads to a one-to-one map rS from N onto L. To any natural number n, it assigns the (n + 1)th word of L, its S-representation, while the inverse map valS sends any word belonging to L onto its numerical value. A subset X is said to be S-recognizable if rS (X) is a regular subset of L. We study the preservation of recognizability of a set of integers after multiplication by a constant for abstract numeration systems built over a bounded language. [less ▲]

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See detailWheat starch variability in characteristics and rheological properties : the influence of varieties harvest years and phytotechnique.
Sinnaeve, Georges; Paridaens, A.-M.; Massaux, Carine et al

Conference (2007, April)

Detailed reference viewed: 4 (2 ULg)
See detailVenus Express observations of the Venus O2 and NO nightglow: distribution and constraints on vertical transport
Gérard, Jean-Claude ULg; Cox, Cédric ULg; Saglam, Adem ULg et al

Conference (2007, April)

Observations have been carried out in the infrared with VIRTIS and the ultraviolet with SPICAV to measure the distribution of the O2 (1 g) nightglow emission at 1.27 μm and the nitric oxide gamma and ... [more ▼]

Observations have been carried out in the infrared with VIRTIS and the ultraviolet with SPICAV to measure the distribution of the O2 (1 g) nightglow emission at 1.27 μm and the nitric oxide gamma and delta bands between 190 and 300 nm. These observations were collected in the tangent limb mode, which maximizes the time period spent by the line of sight through the airglow layer. The O2 (1 g) emission is excited by three-body recombination of O atoms produced on the day side and carried by the general thermospheric circulation to the night side. It is very variable in brightness and has a peak located between 95 and 100 km. The NO airglow is produced by radiative recombination of O atoms with N(4S) resulting from N2 photodissociation and reaches a maximum near 110 km.We combine the altitude and brightness information from the two emissions with simulations of a chemical diffusive model to determine the values of the vertical fluxes of O and N atoms and the strength of the eddy mixing which carries both types of atoms from above the turbopause into the recombination layer.We find that O fluxes on the order of a few 1012 atoms/cm2 s and N fluxes about 1010 atoms/cm2 s can reproduce the observations. The variability of the airglow emissions and the altitude-brightness relation will also be discussed and compared with model predictions. [less ▲]

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See detailThe NO Martian Nightglow observed with the SPICAM UV Spectrometer and comparison with a one-dimensional model.
Cox, Cédric ULg; Saglam, A.; Gérard, Jean-Claude ULg et al

Conference (2007, April)

Observations in the 108-317 nm wavelength range have been performed with the SPICAM ultraviolet spectrometer aboard the Mars Express (MEX) mission. SPICAM has observed the ultraviolet nightglow emission ... [more ▼]

Observations in the 108-317 nm wavelength range have been performed with the SPICAM ultraviolet spectrometer aboard the Mars Express (MEX) mission. SPICAM has observed the ultraviolet nightglow emission in the δ (190-240 nm) and γ (225-270 nm) bands of nitric oxide (Bertaux et al. 2005). This emission arises from the recombination between O(3P) and N(4S) atoms that are produced on the day side to form NO in the night side. We present a summary of the night limb observations performed during the MEX mission. In particular, we describe the variability of the brightness and peak altitude. We find that the altitude of maximum emission varies between 55 and 90 km and the brightness is in the range 0.2 to 4.5 kR. We compare these observations with the results of a chemical-diffusive atmospheric model which solves the continuity equation for O, N(4S) and NO continuity equation using the finite volume method on one dimensional grid. The eddy coefficient, whose value is very uncertain, is a free parameter adjusted to match the observational data. [less ▲]

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See detailLa langue, image d'une société: se marier en Wallonie
Baiwir, Esther ULg

Conference (2007, April)

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See detailA New PLE Approach for Measurement of Dioxin and PCBs in Biological Samples
Focant, Jean-François ULg; Cash; Turner et al

Conference (2007, April)

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See detailHeat Pumping and Reversible Air Conditioning - First Case Study Results
Aparecida Silva, Cleide; Bertagnolio, Stéphane ULg; Hannay, Jules et al

Conference (2007, April)

Detailed reference viewed: 64 (4 ULg)
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See detailBrand Concept Maps: a New Approach to Market Segmentation
Brandt, Céline ULg; Pahud de Mortanges, Charles ULg; Bluemelhuber, Christian et al

Conference (2007, April)

This chapter aims to expand the domain of brand image perception measurement by providing a method for eliciting brand associative networks and comparing it with traditional brand image measurement ... [more ▼]

This chapter aims to expand the domain of brand image perception measurement by providing a method for eliciting brand associative networks and comparing it with traditional brand image measurement methods. This article then argues that these networks may differ from one individual to another, depending on the cultural background and/or the experience with the brand. Accordingly, the author introduces a methodology of clustering consumers with similar perceptions into distinct segments, which can be targeted differently. Using picture analysis and metaphor-based elicitation techniques, Lipton’s Ice Tea brand associations are extracted and utilized as an input for the creation of 160 individual associative networks. These networks are first aggregated to emphasize the brand reputation and subsequently clustered into 6 segments. This paper provides clear arguments for using associative networks as the preferred method to capture the complete brand image. The paper discusses implications of perceptual segmentation for image management, brand positioning, perceptual competition analysis and brand communication. [less ▲]

Detailed reference viewed: 213 (3 ULg)
See detailSimulation of annual cycles of phytoplankton, zooplankton and nutrients to the South of Gran Canaria
Troupin, Charles ULg; Sangrà, Pablo; Arístegui, Javier

Conference (2007, March 28)

Detailed reference viewed: 13 (0 ULg)
See detailAdministrateur central et fonctions exécutives
Collette, Fabienne ULg

Conference (2007, March 27)

Detailed reference viewed: 17 (4 ULg)
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See detailEquations for GFR estimation: application and limits
Cavalier, Etienne ULg; Delanaye, Pierre ULg

Conference (2007, March 24)

Detailed reference viewed: 6 (1 ULg)
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See detailMDRD equation for GFR estimation : analytical limitations
Cavalier, Etienne ULg; Delanaye, Pierre ULg; Krzesinski, Jean-Marie ULg et al

Conference (2007, March 23)

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See detailRédiger en anglais : l’utilisation de templates
Reuchamps, Min ULg

Conference (2007, March 23)

In this paper, I argue that writing in English – for non-native – can be eased by the use of templates. Templates are pre-formatted and reusable models prepared by the author following proper publications ... [more ▼]

In this paper, I argue that writing in English – for non-native – can be eased by the use of templates. Templates are pre-formatted and reusable models prepared by the author following proper publications according to the purpose of the writing. The use of templates offers at least three advantages: first, easing the writing since it follows a pre-formatted model; second, giving to the text a more English touch; third, increasing the chances of publication since it follows models which have been published. This technique works particularly well for short texts (for instance, abstracts, short papers or book reviews). Yet, templates are only a tool amongst other and should be used with these tools. Furthermore, they limit one’s creativity and enclose the author in a pre-formatted structure. Above all, to some extent, templates reflect the way of thinking and writing shared by the Anglo-Saxon academia. [less ▲]

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See detailLa prééclampsie: de la physiopathologie et prise en charge
Brichant, Jean-François ULg

Conference (2007, March 22)

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See detailSynthèse et clôture du séminaire
Halleux, Jean-Marie ULg

Conference (2007, March 21)

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See detailUS/India Civil Nuclear Cooperation Initiative: the Question of Safeguards
Michel, Quentin ULg

Conference (2007, March 20)

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See detailL’art minimaliste américain et la question du neutre
Hagelstein, Maud ULg

Conference (2007, March 19)

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See detailMyosite focale sur atteinte radiculaire S1
Kaux, Jean-François ULg

Conference (2007, March 19)

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See detailLe chewing-gum et la nutrition : clichés et nouveaux mots du pouvoir
Durand, Pascal ULg

Conference (2007, March 17)

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See detailLe conflit dans l'état civil : l'envers du droit chez Thomas Hobbes
Herla, Anne ULg

Conference (2007, March 15)

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See detailImpacts of vegetation changes on LGM climate
Henrot, Alexandra ULg; François, Louis ULg; Munhoven, Guy ULg

Conference (2007, March 12)

The impacts of vegetation change on the climate at the Last Glacial Maximum are investigated with the Earth System Model of Intermediate Complexity Planet Simulator and the dynamic vegetation model Caraib ... [more ▼]

The impacts of vegetation change on the climate at the Last Glacial Maximum are investigated with the Earth System Model of Intermediate Complexity Planet Simulator and the dynamic vegetation model Caraib (CARbon Assimilation in the Biosphere). [less ▲]

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See detailRigid body attitude synchronization: a consensus approach
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg; Leonard, Naomi

Conference (2007, March)

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See detailLe regard des intervenants et l'éventail des parents
Absil, Gaëtan ULg; Denis, Marie-Elise

Conference (2007, March)

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See detailLa langue et le réel. Réflexions sur la motivation iconique
Polis, Stéphane ULg

Conference (2007, February 28)

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See detailWhen Mass Spectrometry meets Spectroscopy: A Different Perspective on Ion Photodissociation
Gabelica, Valérie ULg

Conference (2007, February 27)

Photodissociation methods are more and more widely used in analytical mass spectrometry as an alternative to collision-induced dissociation. A well known example is infrared multiphoton dissociation ... [more ▼]

Photodissociation methods are more and more widely used in analytical mass spectrometry as an alternative to collision-induced dissociation. A well known example is infrared multiphoton dissociation (IRMPD) with CO2 lasers (wavelength 10.6 µm), which is often preferred to SORI-CID in FTICR mass spectrometers. IR photons are absorbed by the vibrational modes of the ion, and this vibrational energy is redistributed all over the molecule. The fragmentation channels observed are usually the same as for CID. Recently, new possibilities offered by UV lasers of fixed wavelength (i.e. 157 nm or 193 nm) for peptide fragmentation were described. On the contrary to IRMPD, irradiation at these UV wavelengths gives rise to fragmentation channels which are unprecedented in CID, suggesting that photochemical reactions take place. The prerequisite for ion photodissociation is photon absorption. In the infrared, photon absorption results in the excitation of vibrational modes. Anharmonic coupling of the excited vibrational modes with other vibrational modes of the ion results in a rapid intramolecular vibrational energy redistribution (IVR). The energy of an IR photon is too low for the ion to dissociate (0.117 eV/photon for a 10.6 µm CO2 laser). Multiple cycles of absorption and IVR are necessary for IR photodissociation to occur (hence the term multiphoton). Because the first step in photodissociation is photon absorption, the recording of the photodissociation yield as a function of the photon wavenumber gives information on the vibrational modes of the ion. This is the basic principle of infrared spectroscopy experiments inside the mass spectrometer. This technique will be illustrated by a recent example on DNA single strands and quadruplex structures. The shifting of the vibrational frequencies corresponding to guanine C=O stretch gives information on the base pairing in the DNA ion in the gas phase. The situation is somewhat different with UV photons, which may lead to either electronic excitation of the ions or direct electron ejection. Electronic excited states may evolve in different ways: (1) Internal conversion to a vibrationally excited electronic ground state. Resulting fragments would then be similar to CID and IRMPD. This process can be multiphotonic and could be coined UVMPD. (2) Electron autodetachment, leading to the formation of radicals that can be further fragmented to obtain ECD-like or EDD-like fragments. (3) Photochemical reactions giving rise to unprecedented fragmentation channels. In all three cases, product ion yield is conditioned by photon absorption by an electronic state, meaning that UV spectroscopy of gas-phase ions can be performed with a mass spectrometer. We recently explored the effects of photon absorption on multiply charged DNA anions. Depending on the photon wavelength and on the chromophores, all three situations could be observed. Electron photodetachment is the major channel observed when using wavelengths corresponding to DNA base absorption.1,2 When irradiated at proper wavelength, chromophoric DNA ligands also give rise to electron photodetachment. UV-visible spectra of the DNA duplexes and complexes were recorded and compared with solution-phase spectra. Finally, a porphyrin ligand gives rise to specific fragmentation pathways when irradiated at 450 nm, while photodetachment is observed at 260 nm. The most recent results will be presented and discussed. 1. Gabelica, V.; Tabarin, T.; Antoine, R.; Rosu, F.; Compagnon, I.; Broyer, M.; De Pauw, E.; Dugourd, P. Electron Photodetachment Dissociation of DNA Polyanions in a Quadrupole Ion Trap Mass Spectrometer. Anal. Chem. 2006, 78 (18), 6564. 2. Gabelica, V.; Rosu, F.; Tabarin, T.; Kinet, C.; Antoine, R.; Broyer, M.; De Pauw, E.; Dugourd, P. Base-Dependent Electron Photodetachment from Negatively Charged DNA Strands upon 260-nm Laser Irradiation. J. Am. Chem. Soc. 2007, accepted for publication. [less ▲]

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See detailSecondary dispersal by dung beetles of seeds primarily dispersed by tamarins
Culot, Laurence ULg

Conference (2007, February 22)

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