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See detailLa dysphonie, diagnostic et traitements
FINCK, Camille ULg

Conference (2007, September)

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See detailHeat Pumping and Reversible Air Conditioning: Retrofit opportunities in a laboratory building
Aparecida Silva, Cleide; Bertagnolio, Stéphane ULg; Hannay, Jules et al

Conference (2007, September)

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See detailLa Flexicurité revisitée à l’aune des pratiques effectives
Xhauflair, Virginie ULg; Pichault, François ULg

Conference (2007, September)

Detailed reference viewed: 12 (1 ULg)
See detailFeasibility study of the diluted combustion in a semi-industrial boiler at low temperatures
Seggio, Giovanni; Ngendakumana, Philippe ULg; Pesenti, Barbara et al

Conference (2007, September)

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main ... [more ▼]

The aim of this work is to assess the technical feasibility and highlight the specific problem of application of diluted (or mild) combustion in a medium scale boiler by direct gas injection. The main difficulty is due to the high geometrical confinement and heat losses of a typical boiler combustion chamber, which prevents from getting the minimum level of reactants dilution and temperature needed to reach mild combustion regime. Last year, a preliminary CFD study was performed to select a jet burner and secondary gas injector able to generate sufficient dilution and temperature of the air and gas jets before they meet in the combustion chamber of the boiler. In this work, the optimization of the position and the diameter of the gas injector has been performed. Finally, the boundary conditions and the parameters of the combustion model have been investigated. [less ▲]

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See detailCO emissions of fuel oil boilers in transient and cyclic regimes: performance of burners without and with “antidrip” systems
Makaire, Danielle ULg; Ngendakumana, Philippe ULg

Conference (2007, September)

CO emission peaks from fuel oil boilers in transient and cyclic regimes have been measured in previous studies. In order to evaluate these emissions, tests have been performed without and with an anti ... [more ▼]

CO emission peaks from fuel oil boilers in transient and cyclic regimes have been measured in previous studies. In order to evaluate these emissions, tests have been performed without and with an anti-drip system installed on the burner nozzle. Flue gas composition was measured using classical analysers (CO2, O2, CO and NOx) and CO emissions results were analysed and discussed. It was found that the anti-drip system reduced cold start CO emissions and did not affect steady-state CO emissions. At first, no reduction was noticed when the burner was cycling. Further investigation indicated that there was an experimental artefact caused by an air volume trapped in the pressure measurement system. When the air was purged and with the anti-drip system, CO peaks when the burner was cycling were strongly reduced and CO emissions remained under European standards limits. [less ▲]

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See detailNarrative Songs of the Bruges Lacemakers (1730-1879)
Peere, Isabelle ULg

Conference (2007, September)

A general account of the textual and contextual data on lacemakers' songs provided by Lootens and Feys' song collection, Chants populaires flamands (1879) as a valuable source of information on the ... [more ▼]

A general account of the textual and contextual data on lacemakers' songs provided by Lootens and Feys' song collection, Chants populaires flamands (1879) as a valuable source of information on the complex study of the lacemaking tradition [less ▲]

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See detailOn the spatial variation of double-sloped decay in coupled-volume concert halls
Billon, Alexis ULg

Conference (2007, September)

In a system of coupled rooms, a double-sloped can be observed in the room containing the source when the coupled room is more reverberant. This decay is formed of a first quick energy decrease due to the ... [more ▼]

In a system of coupled rooms, a double-sloped can be observed in the room containing the source when the coupled room is more reverberant. This decay is formed of a first quick energy decrease due to the first room and a second slower one due to the energy which is fed back from the coupled room. Today, this effect is used to obtain simultaneously clarity and reverberance in concert halls. Parameters to achieve a strong double-sloped decay are now well known. In this preliminary work, the spatial variation of the double decay strength within the concert hall is studied using numerical simulations. Firstly, the indicators quantifying the double decay used in this study are presented. Then, the results of two configurations with the same coupling characteristics but with different coupling area locations are compared. Finally, an empirical model based on the statistical theory is proposed. [less ▲]

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See detailFoams of polycaprolactone/MWNT nanocomposites for efficient EMI shielding
Thomassin, Jean-Michel ULg; Kollar, J.; Caldarella, Giuseppe ULg et al

Conference (2007, August 27)

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See detailThe clinic of anger : from psychopathology to the adequacy of punishment
Philippe, Paule ULg; Scholl, Jean-Marc ULg

Conference (2007, August 27)

Not every fit of anger is good. But some are not to be avoided either. And fits of anger have not all the same aetiology. The authors try to understand the various psychopathological and\or ... [more ▼]

Not every fit of anger is good. But some are not to be avoided either. And fits of anger have not all the same aetiology. The authors try to understand the various psychopathological and\or neuropsychological mechanisms that could explain anger whether in babies, children, teenagers or adults. Anger can arise from the feeling of being overwhelmed – coming by an overflow of the possibilities of management of the ego – (¬¬as a consequence of excessive intake of sensory or emotional information, of hypersensitivity…), from an unstable self-image (see-saw from a positive self-image to a negative one), from an overvalued self-image (narcissistic or megalomaniac personality) or from an undervalued self-image (depressive disorders), from a "Uneasiness in the Situation of Being Alone" (search for link), from great impulsiveness (15% of ADHD), from the incomprehension of the conversational partner (deficit of interpersonal perceptions); anger can also arise from projections (paranoid ones or others), from incomprehension (problems of intelligence, language, culture..) and\or from the refusal of the limits (well or inappropriately imposed, always the same ones or variable). Anger can sometimes be a warning sign of maltreatment disorder that has to be listened to. Considering these various mechanisms, it seems important to reflect on how to adapt punishments: corporal punishment? shaming? placing at a distance? restraining? isolation? task of repairing? … Their purpose must be to help the child to have better control of his/her behaviour and a better self-image. This reflection comes within the context of a psychotherapeutic approach with the parent’s cooperation and\or cooperation of the people in charge of the child. The added value of medication is also considered (methylphenidate, antidepressant, atypical antipsychotic drugs, mood stabilisers…). An appropriate treatment provides child as well as home environment with relief and so allows moving on to other problematic components of the situation in the psychotherapeutic approach. Toutes les colères ne sont pas bonnes. Mais toutes les colères ne sont pas non plus à éviter. Et toutes les colères n’ont pas les mêmes étiologies. Les auteurs cherchent à comprendre les différents mécanismes psychopathologiques et/ou neuropsychologiques qui pourraient sous-tendre les colères, que ce soit chez les bébés, les enfants, les adolescents ou les adultes. Les colères peuvent naître d’un débordement des possibilités de la gestion du moi (suite à un apport excessif d’informations sensorielles ou émotionnelles, d’une hypersensibilité,…), d’une image de soi instable (bascule d’une image positive vers une image négative de soi) ou sur-valorisée (trait de personnalité narcissique, trait mégalomaniaque), ou dévalorisée (image dépressive de soi), d’un "Mal-être en situation d’être seul" (recherche d’un lien), d’une grande impulsivité (15 % des ADHD…), d’une incompréhension de l’interlocuteur (déficit des perceptions intersubjectives), ou encore naître de projections (paranoïdes ou autres), de l’incompréhension (problème d’intelligence, de langue, de culture…) et/ou du refus des limites (bien ou mal posées, toujours les mêmes ou changeantes…). Et elles sont parfois un signal d’alarme de maltraitance qu’il faut aussi entendre. Face à ces différents mécanismes, il paraît important de réfléchir à comment ajuster les punitions: punition physique ? humiliation ? répression ? mise à distance? contention? isolement? tâche de réparation, de remise en lien ?… Elles chercheront à aider l’enfant à garder un meilleur contrôle de son comportement et une meilleure image de lui. Cette réflexion s’inscrit dans une approche psychothérapeutique avec la collaboration des parents et/ou des responsables de l’enfant. L’intérêt d’une médication ajoutée (méthylphénidate, antidépresseurs, antipsychotiques atypiques, régulateurs de l’humeur….) est également envisagé. Une prise en charge bien adaptée apporte alors un apaisement tant pour l’enfant que pour le milieu de vie et permet ensuite d’aborder en psychothérapie d’autres composantes problématiques de la situation. [less ▲]

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See detail« “Unease in the Situation of Being Alone” and “Separation Anxiety”: Semeiology from Early Childhood to Adolescence. »
Scholl, Jean-Marc ULg

Conference (2007, August 27)

The following presents the results of a semeiological study of 170 children that has enabled us to identify a condition that we call “Unease in the Situation of Being Alone.” As the name suggests, the ... [more ▼]

The following presents the results of a semeiological study of 170 children that has enabled us to identify a condition that we call “Unease in the Situation of Being Alone.” As the name suggests, the essence of this condition is a feeling of unease that appears when the subject is alone. This sense of unease develops according to the following pattern: Already as an infant, the subject requires the presence of another person in order to be able to fall asleep. At around 2.5 years, with the beginning of schooling away from home, the child has difficulties accepting separation from his or her parents. At around 5 years, the child shows an aversion to playing alone without the presence of another person or an animal; if he or she does play alone, then he or she will constantly ask where the adult is. With the onset of sleep, the child often calls out to his or her parents, and will sometimes even leave his or her bedroom or ask to sleep with the parents. At around 8 years, he or she will have no longer have any difficulties in leaving the house and the immediate presence of his or her parents, for example to go to play with neighbourhood friends. Nevertheless, he or she will be ill at ease if one of the parents should leave the house temporarily. At around 9 years, the child begins to display the typical adult symptomology, which consists in a vague feeling of unease that descends prior to falling asleep. The adult has trouble verbalizing this feeling, which is in fact unaccompanied by any representational content; the best description he or she can manage is to speak of an empty “void” or a “nothingness.” He or she tries to delay going to sleep, say by reading in bed, in order to avoid this feeling. He or she will also try to wear himself or herself out, so as to be able to fall asleep quickly. The adult who feels this “uneasiness” during the day will counter it by one or more of the following 4 means: 1. various activities; 2. sensory input (for example, keeping the radio or TV switched on); 3. filling his or her "internal world" (for example, by reading); 4. a pet. Some conclusions and hypotheses regarding “Unease in the Situation of Being Alone”: A) It should be distinguished from Separation Anxiety; B) It correlates with a delayed appearance of the ability to grasp temporal landmarks. Note, however, that this delay does not concern the understanding of time-sequencing, or of objective notions of time, but rather affects the subjective apprehension of time. The subject is deficient in developing what we might call a “foretaste” of how long a certain period of time will last. C) Hypothesis: This condition is related to a malfunctioning of the neurophysiological platform that serves as the physiological basis for the evaluation of duration, or the internal gauge by which we anticipate temporal duration. D) This hypothesis would help to explain why “mental representations” are insufficient to enable the child to acquire the subjective feeling of “permanent” selfhood, precisely because he is deficient in an internal feeling for temporal duration. E) The condition that we have described is systematically present in cases of bipolarity, even though it is not pathognomic for bipolarity. It is found both in an isolated state and in other nosological entities. At a minimum, it is a simple characteristic of the person affected. [less ▲]

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See detailFirst results of body condition score modeling for Walloon Holstein cows
Bastin, Catherine ULg; Laloux, Laurent; Gillon, Alain ULg et al

Conference (2007, August 25)

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See detailUsing Survey Data to Resolve the Exchange Risk Exposure Puzzle
Muller, Aline ULg; Verschoor, Willem; Jongen, Ron

Conference (2007, August 24)

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See detailJupiter’s polar auroral emissions-signatures of magnetic reconnection
Radioti, Aikaterini ULg; Gérard, Jean-Claude ULg; Grodent, Denis ULg et al

Conference (2007, August 23)

The polar auroral emissions at Jupiter can be divided into three regions fixed in mag- netic local time: the dawnside dark region, the poleward swirl region and the duskside active region in which flares ... [more ▼]

The polar auroral emissions at Jupiter can be divided into three regions fixed in mag- netic local time: the dawnside dark region, the poleward swirl region and the duskside active region in which flares and arc-like features are observed. Previous studies re- lated the polar emissions to the solar wind driven Dungey cycle and Vasyliunas flow cycle. Based on HST STIS and ACS images we study extensively the time variations of the morphology and brightness of various polar auroral features as well as their duration and reoccurrence. We magnetically map their location in the equatorial plane and we compare their spatial size and time scales with the reconnection events taking place in the Jovian magnetotail. We discuss the possibility that some polar auroral features are signatures of magnetic reconnection. [less ▲]

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

Conference (2007, August 22)

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See detailEvidence of food quality limitation in benthic river insects
Darchambeau, François ULg; Glémet, Hélène; Bélanger, Tommy et al

Conference (2007, August 16)

Detailed reference viewed: 6 (0 ULg)
See detailPhytoplankton ecology of Lake Kivu (Eastern Africa): biomass, production and elemental ratios
Sarmento, Hugo; Isumbisho, Mwapu; Stenuite, Stephan et al

Conference (2007, August 16)

Detailed reference viewed: 5 (0 ULg)
See detailEFFECT OF ANTI-ANDROGENIC SUBSTANCES ON THE SEXUAL REPRODUCTION OF ROTIFERS : IMPACTS ON BRACHIONUS CALYCIFLORUS MALE FERTILITY
Joaquim-Justo, Célia ULg; Maule, P; Luy, N et al

Conference (2007, August 12)

Many substances released in aquatic ecosystems have been reported to disrupt endocrine systems in vertebrates and invertebrates. In the rotifer Brachionus calyciflorus, studies show that chemicals ... [more ▼]

Many substances released in aquatic ecosystems have been reported to disrupt endocrine systems in vertebrates and invertebrates. In the rotifer Brachionus calyciflorus, studies show that chemicals characterized by a high affinity to the vertebrate androgen receptor depress sexual reproduction at concentrations one to two orders of magnitude below those that affect asexual reproduction. We studied the effect of cyproterone acetate, an anti-androgen of steroid like structure, and of the pesticide fenitrothion, a non steroidal molecular which has a high affinity to the vertebrate androgen receptor, on the sexual reproduction of rotifers. In mating experiments we crossed control females with exposed males and vice versa to determine whether anti-androgens affected males, females or both. Fertilization rate and number of resting eggs produced were affected by both substances tested. With fenitrothion, depression of these endpoints was observed exclusively when males were treated. Cyproterone acetate enhanced production of resting eggs whereas fertilization rate was not significantly affected. Increased production of resting eggs was observed both with treated females and males. Parameters of male fertility were compared in control and in exposed males. We report impacts on spermatozoa numbers, morphology and fertilizing potential, and on male morphology, longevity and mating behaviour for the two substances tested. [less ▲]

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See detailFasciola hepatica: An assessment of the vectorial capacity of Radix labiata and R. balthica commonly found in Belgium
Caron, Yannick ULg; Lasri, Saadia; Losson, Bertrand ULg

Conference (2007, August)

A previous study in Belgium revealed that genetic material of Fasciola sp. was present in four local snail species: Galba truncatula, Radix peregra, Radix ovata and Lymnaea stagnalis. Laboratory cultures ... [more ▼]

A previous study in Belgium revealed that genetic material of Fasciola sp. was present in four local snail species: Galba truncatula, Radix peregra, Radix ovata and Lymnaea stagnalis. Laboratory cultures of these four species were experimentally infected with F. hepatica. The collected metacercariae were fed to rats and the infection in that vertebrate hosts was monitored through several techniques. The mortality rates in the breeding unit was less than 10 % in G. truncatula, R. peregra, and L. stagnalis colonies. Microscopy revealed the presence of larval stages in 78.3 % and 48 % of G. truncatula and R. peregra snails, respectively. These data were confirmed by a PCR that amplifies a parasite specific sequence. R. peregra shed fewer metacercariae and more irregularly than G. truncatula. In R. ovata and L. stagnalis the infection rates were low. Specific DNA was detected in both cases by PCR but no metacercariae were shed. The metacercariae shed by R. peregra were as infective to rats as those from G. truncatula. The PCR technique was more sensitive than microscopic examination. This study demonstrated that R. peregra may act as an accidental intermediate host for F. hepatica in Belgium. [less ▲]

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See detailAsteroseismology of beta Cephei stars: effects of the chemical composition
Thoul, Anne ULg

Conference (2007, August)

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See detailPublic spaces in a fragmented city : the case of Beirut suburbs
Farah, Jihad ULg

Conference (2007, August)

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See detailQualitative—not Quantitative—Deliberative Polling ?
Reuchamps, Min ULg

Conference (2007, July 30)

The last twenty years have seen the emergence of a new generation of polls: the deliberative polls. Unlike usual polling, deliberative polling—first suggested by Fishkin and Luskin—emphasizes not only the ... [more ▼]

The last twenty years have seen the emergence of a new generation of polls: the deliberative polls. Unlike usual polling, deliberative polling—first suggested by Fishkin and Luskin—emphasizes not only the representation of polling but also the deliberation. The deliberative poll attempts to represent all in a given population, through a statistical microcosm empowered to think about the issues in question under favorable conditions—the sample population takes a questionnaire, then is informed through a learning process that alternates discussions in small groups and with experts and politicians, and eventually re-takes the same questionnaire. Although—quantitative—deliberative polling catches the big picture—what people think before and after and how their opinions vary, it hardly gives any insight on why the citizens change their opinions and, above all, what it means after the learning process. This question is especially important in topics where little change of opinions may be expected such as political preferences and identities. Specifically, the qualitative deliberative polling is used to explore the relationship between the citizens’ perception (understood as knowledge, legitimacy, identity, and perception of the others) of the federal government in both Belgium and Canada and their federal preferences vis-à-vis the evolution of the regime. Conducting qualitative and quantitative deliberative polling in those cases seem to offer the best result since the quantitative aspect provides a general picture of the change of opinions while the qualitative aspect endeavors to understand the change of opinions. Qualitative deliberative polling relies on a systematic qualitative content analysis of the focus groups’ discussions and interaction between the participants and the experts. To combine qualitative methods with—quantitative—deliberative polling has the potential to provide a finer picture of the citizens’ opinions on a broad variety of topics and issues. [less ▲]

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See detailNumerical tools for assessing reservoir sedimentation and sediment management
Dewals, Benjamin ULg

Conference (2007, July 27)

Detailed reference viewed: 13 (3 ULg)
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See detailStainless steel beam-columns in case of fire
Lopes, Nuno; Vila Real, Paulo; Da Silva, Luis et al

Conference (2007, July 25)

Detailed reference viewed: 6 (0 ULg)
See detailEvidence of food quality limitation in benthic river insects
Darchambeau, François ULg; Glémet, Hélène; Bélanger, Tommy et al

Conference (2007, July 12)

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See detailAssessment of the NeQuick Model at Mid-latitudes using GPS TEC and Ionosonde Data
Bidaine, Benoît ULg; Warnant, René ULg

Conference (2007, July 11)

The ionosphere plays a crucial role in GNSS accuracy. In extreme cases, this electrically charged part of the atmosphere can lead to errors in positioning exceeding 100m. At first approximation, the ... [more ▼]

The ionosphere plays a crucial role in GNSS accuracy. In extreme cases, this electrically charged part of the atmosphere can lead to errors in positioning exceeding 100m. At first approximation, the ionospheric effect depends on the frequency of the incident signal and on the total content in free electrons of the ionosphere (“total electron content”, TEC) which is the integral of the electron density on the path between the satellite and the receiver. The modelling of this parameter reveals then itself to be critical in particular for single-frequency receivers, the most common ones constituting the mass market, but also for multiple-frequency devices which will comprise a fallback mode in single frequency within the framework of critical applications such as civil aviation where the level of precision must be guaranteed in all circumstances. The NeQuick model, which has been chosen for correcting the ionospheric error contribution in GALILEO single frequency users, calculates the electron density at a given point of the ionosphere according to the time conditions and the solar activity. This electron density can be integrated along the path from the receiver to the considered satellite to provide the TEC. The NeQuick model depends on a parameter Az (“effective ionization level”) which will be daily updated by the GALILEO ground stations to give the solar activity information to the model. In order to reach the ionosphere error correction level objective (70% or 20 TECu whichever is larger), the model itself as well as its use for GALILEO are investigated. Different situations have to be considered: different latitude regions (space conditions), different hours, seasons and years (time conditions) and specific phenomena appearance (magnetic storms, Travelling Ionospheric Disturbances – TIDs). In addition the results can be compared to different data sets among which GPS slant or vertical TEC measurements, Global Ionospheric Maps, ionosonde profiles, topside soundings but also other ionosphere models results such as IRI. As a first step in a thorough comparison process, we take benefit of various ionosphere data from the Dourbes Observatory (Belgium) where ionosonde and GPS TEC data are available on a period of more than one solar cycle, to study the mid-latitudes. We first investigate the difference between GPS-derived vTEC for Dourbes station and vTEC values from NeQuick for the latest years (between solar maximum in 2000 and minimum in 2006) in order to observe the temporal dependencies towards Universal Time, season and solar activity. The paper analyses the different situations when NeQuick fails to represent TEC in an adequate way to provide an efficient correction for navigation. Ionosonde measurements will help in the interpretation of these situations. [less ▲]

Detailed reference viewed: 93 (17 ULg)
See detailAdvances in cobalt mediated radical polymerization (CMRP) of vinyl monomers
Debuigne, Antoine ULg; Detrembleur, Christophe ULg; Bryaskova, Rayna et al

Conference (2007, July 11)

Detailed reference viewed: 20 (3 ULg)
See detailStatistical study of ionospheric small-scale irregularities at mid-latitudes using GPS measurements
Wautelet, Gilles ULg; Warnant, René ULg

Conference (2007, July 11)

At the present time, Global Navigation Satellite Systems (GNSS) allow to obtain a precision of a few centimeters in real time using positioning techniques like the so-called Real Time Kinematics (RTK ... [more ▼]

At the present time, Global Navigation Satellite Systems (GNSS) allow to obtain a precision of a few centimeters in real time using positioning techniques like the so-called Real Time Kinematics (RTK). Nowadays, the ionosphere remains the most important error source affecting such GNSS applications. Indeed, the presence of small-scale irregular structures in the Total Electron Content (TEC) can strongly affect the reliability and the precision of high precision real time positioning applications. Those small-scale structures can have several origins: Traveling Ionospheric Disturbances, "noise-like" variability in TEC, scintillations. The Royal Meteorological Institute of Belgium (RMI) has developed a software which allows to monitor the TEC using GPS measurements (at one station). The software can also be used to detect small-scale irregularities in TEC by monitoring TEC temporal gradients (i.e. rate of change). The RMI has applied this software to the GPS data collected at Brussels from April 1993 up to now what represents a period of more than a Solar Cycle. The results obtained from this GPS-TEC software will be presented. First, the paper analyzes the different types of small-scale structures which have been observed in TEC. Then, a statistical study of those ionospheric irregularities is presented; we shall analyze their probability of occurrence and their amplitude (in TECU/min) depending on daytime, season, solar activity, geomagnetic activity... The results of our study which is financed by the GNSS Supervising Authority will allow to have a better understanding of the usual case/worst case conditions encountered in high precision positioning applications based on GNSS. [less ▲]

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See detailPlankton ecology of Lake Kivu and the consequences of a planktivore introduction
Descy, Jean-Pierre; Sarmento, Hugo; Isumbisho, Mwapu et al

Conference (2007, July 09)

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See detailThe asteroseismic analysis of the pulsating sdB Feige 48 revisited
Van Grootel, Valérie ULg; Charpinet, Stéphane; Fontaine, Gilles et al

Conference (2007, July)

We present a new detailed analysis of the short period pulsating sdB star Feige 48, based on the same observations than in our previous work (Charpinet et al., 2005, A&A 443, 251) but with our new codes ... [more ▼]

We present a new detailed analysis of the short period pulsating sdB star Feige 48, based on the same observations than in our previous work (Charpinet et al., 2005, A&A 443, 251) but with our new codes including the rotation of the star. Feige 48 is supposed to be a relatively fast rotator, showing a fine structure in its pulsation spectrum about 28 µHz on three groups in the 9 frequencies. On the other side, Feige 48 belongs to a close binary system (likely with a white dwarf) where the orbital period is 9.02 +/- 0.03h (S. O'Toole 2004). With our new codes including the rotation (for a given rotation law, we calculate associated multiplets for each frequency with the perturbative approach on the first order), avoiding us to make assumptions about the m=0 modes, we were able to fit all the 9 periods together, leading to sligthly different estimations for the structural parameters of Feige 48 than in our previous work. Moreover, the rotation of the star is found to be solid with a period of 32,540s <=> 9.038h, very close to the orbital period of the system determined by spectroscopy, confirming the reasonable assumption that the system is tidally locked. In this context, it was possible to exclude that Feige 48 has a fast rotating core in term of much poorer merit functions. [less ▲]

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See detailCutting planes and infeasibility certificates from lattice-point-free polyhedra
Louveaux, Quentin ULg

Conference (2007, July)

A central result in the theory of integer optimization states that a system of linear diophantine equations Ax = b has no integral solution if and only if there exists a vector in the dual lattice, yT A ... [more ▼]

A central result in the theory of integer optimization states that a system of linear diophantine equations Ax = b has no integral solution if and only if there exists a vector in the dual lattice, yT A integral such that yT b is fractional. We extend this result to systems that both have equations and inequalities {Ax = b, C x ≤ d}. We show that a certificate of integral infeasibility is a linear system with rank(C) variables containing no integral point. The result also extends to the mixed integer setting. [less ▲]

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See detailPhytoremediation of contaminated sites in urban environment : preliminary results of a study focussed on Lubumbashi.
Colinet, Gilles ULg; Saad, Layla ULg; Cubaka, Alfred et al

Conference (2007, July)

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do ... [more ▼]

A specific flora has developped in Central Africa on soils which are naturally rich in Cu and Co. Mining and ore treatment activities in the Katanga province (RDC) have generated contaminations which do endanger ecosystem viability and/or human health. A survey of edaphic conditions prevailing for plant growing in natural metalliferous outcrops, the « copper hills », in mining sites (quarries), and in contaminated areas around metal smelters, is conducted as a first stage of a phytoremediation-based research program. Soluble, available and total content in some metallic trace elements have been measured. The first results show a relatively high heterogeneity inside and between sites. But the main finding is related to the very different nature of contamination between the three types of sites. This point constitutes an additionnal difficulty that should be taken into account for the selection of metallophytic species from the copper hills or the quarries in order to vegetalize a site contaminated by atmospheric fall outs from metal smelters in Lubumbashi. [less ▲]

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See detailFirst steps to model milk urea in a management perspective
Bastin, Catherine ULg; Gillon, Alain ULg; Laloux, Laurent et al

Conference (2007, July)

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See detailAssessment of Lake Sediment Sensitivity to Earthquakes and Climate Cycles along the North Anatolian Fault,
Boes, Xavier; Avsar, Ulas; Doner, L. et al

Conference (2007, July)

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See detailFate of zinc in a sandy Luvisol submitted to 100 years of massive irrigation with raw waste waters: a multi-scale approach
Dere, Christelle ULg; Lamy, Isabelle; Cornu, Sophie

Conference (2007, July)

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See detailCreative Industries, governmentalities and heterotopias: the case of local government in France
Froehlicher, Thomas ULg; Guillemin, Arnaud; Apangu, Patricia

Conference (2007, July)

Creative industries, since 1997, have become assets for economic and cultural development. Nations around the world, at different political levels, are now focusing on the development of a creative ... [more ▼]

Creative industries, since 1997, have become assets for economic and cultural development. Nations around the world, at different political levels, are now focusing on the development of a creative industries policy. The success of this concept can be linked to the fact that this meta-sector has one of the highest levels of economic growth in these last years. Despite the growing number of studies on creative industries, the rationale behind the implementation of this type of policy remains unclear. We seek to further understand how and why local governments are participating in creative industries and how it is spatially acted, by using the concepts of governmentality and heterotopias, as defined by Foucault (1991a, 1997), to explore the rationality and the dynamics behind this policy. Our study focuses on the case of the “Grand Lyon” and its economic development agency. In early 2006, Lyon decided to launch a creative industries policy focused on its two existing creative clusters linked to fashion and video games, Lyon Vision Mode and Lyon Game respectively. A transversal approach was taken to include various and often unconnected sectors. Lyon is the third largest French city with a strong industrial economy. The city has the ambition to be in the top fifteen of the creative regions in Europe. Our results demonstrate that, first of all, the practices of creative industries highlight the different types of technologies that were expressing the rationality and mentality of the ‘governors’. We also found that the policy deployed by the local government created two types of heterotopias (Foucault, 1997). These separate and different spaces appeared as places for creativity in the development and implementation of the creative industries strategy. These heterotopias help to build a sense of community among the participants, and create a tribe, clan, or as defined by Florida (2002), a class. [less ▲]

Detailed reference viewed: 108 (3 ULg)
See detailCOST 296 Working Group 3 “Space-based systems” activities and results
Warnant, René ULg

Conference (2007, July)

Detailed reference viewed: 8 (0 ULg)
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Peer Reviewed
See detailUsing survey data to resolve the exchange risk exposure puzzle
Muller, Aline ULg; Jongen, Ron; Verschoor, Willem

Conference (2007, June 30)

Detailed reference viewed: 4 (0 ULg)
Peer Reviewed
See detailOffice Markets and Urban Mutations in Belgium
Halleux, Jean-Marie ULg

Conference (2007, June 29)

Detailed reference viewed: 2 (0 ULg)
Peer Reviewed
See detailCompte-rendu des travaux de l'atelier thématique "Scale, Time and Space"
Van Ruymbeke, Muriel ULg

Conference (2007, June 29)

Detailed reference viewed: 8 (0 ULg)
See detailEmpty housing and disurbanisation in Wallonia
Halleux, Jean-Marie ULg

Conference (2007, June 28)

Detailed reference viewed: 39 (1 ULg)
See detailEvidence of upward filed-aligned currents at the open-closed field line boundary in Saturn's noon magnetosphere: observations and theory
Bunce, E. J.; Cowley, S. W. H.; Talboys, D. L. et al

Conference (2007, June 26)

Detailed reference viewed: 5 (0 ULg)
See detailExploration of the neuronal substrates of Directed Forgetting with fMRI.
Feyers, Dorothée ULg; Hogge, Michaël; Salmon, Eric ULg et al

Conference (2007, June 26)

Detailed reference viewed: 4 (2 ULg)
See detailThe morphology of the X-ray emission above 2 keV from Jupiter's aurorae
Elsner, R. F.; Branduardi-Raymont, G.; Galand, M. et al

Conference (2007, June 25)

Detailed reference viewed: 5 (0 ULg)
See detailJupiter's changing auroral location
Grodent, Denis ULg; Bonfond, Bertrand ULg; Radioti, Aikaterini ULg et al

Conference (2007, June 25)

Detailed reference viewed: 2 (1 ULg)
See detailCassini UVIS Observations of Saturn's Auroras
Pryor, W. J.; Ajello, J. M.; Gustin, Jacques ULg et al

Conference (2007, June 25)

Detailed reference viewed: 15 (3 ULg)
See detailThe auroral footprint signatures of satellites on Jupiter
Gérard; Bonfond, Bertrand ULg; Grodent, Denis ULg

Conference (2007, June 25)

Detailed reference viewed: 3 (0 ULg)
See detailEntreprendre au féminin, une réalité multiple, des attentes différenciées
Cornet, Annie ULg

Conference (2007, June 22)

Detailed reference viewed: 96 (1 ULg)
Full Text
See detailUne rétrospective du Fonds des Communes : objectifs et indicateurs
Husson, Jean-François ULg

Conference (2007, June 19)

Cette présentation dresse l'historique du Fonds des communes en Wallonie et discute des objectifs énoncés du politique au regard des mécanismes et formules de répartition.

Detailed reference viewed: 14 (4 ULg)
Peer Reviewed
See detailPhotosynthesis in picoeucaryote algae, the Ostreococcus case
Cardol, Pierre ULg

Conference (2007, June 19)

Detailed reference viewed: 14 (0 ULg)
See detailFonds des communes et externalités
Halleux, Jean-Marie ULg

Conference (2007, June 19)

Detailed reference viewed: 36 (1 ULg)
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See detailHemocompatibility study of new functionalized polycations tailored to modify the surface properties of red blood cells
Grandfils, Christian ULg; Riquelme, B; Foresto, P et al

Conference (2007, June 19)

Detailed reference viewed: 11 (0 ULg)
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See detailEffet de l’expression hétérologue d’une oxydase alternative sur le protéome mitochondrial et cellulaire de Saccharomyces cerevisiae
Mathy, Grégory ULg

Conference (2007, June 15)

L’oxydase alternative (AOX) est une ubiquinol-oxygène oxido-réductase qui au niveau mitochondrial, catalyse l’oxydation de l’ubiquinol en transférant directement ses électrons à l’oxygène. De part son ... [more ▼]

L’oxydase alternative (AOX) est une ubiquinol-oxygène oxido-réductase qui au niveau mitochondrial, catalyse l’oxydation de l’ubiquinol en transférant directement ses électrons à l’oxygène. De part son activité catalytique, cette protéine entre en compétition avec le complexe III et est donc un système dissipateur d’énergie puisque les électrons transférés par AOX à l’oxygène ne contribueront pas à l’établissement du gradient électrochimique de protons par la voie des cytochromes. Dans cette étude, nous avons voulu déterminer l’impact de l’expression hétérologue d’AOX chez un organisme qui en est naturellement dépourvu : Saccharomyces cerevisiae. L’expression d’AOX chez S. cerevisiae est fonctionnelle et conduit à une augmentation du temps de génération de 30% par rapport à la souche contrôle. De manière à identifier les voies métaboliques affectées par l’expression d’AOX chez la levure, nous avons réalisés une étude protéomique sur le protéome mitochondrial et cellulaire par l’approche SILAC. Le SILAC (stable isotopic labelling by amino-acid in cell culture) est une technique de protéomique comparative qui permet de calculer directement les changements de niveau d’expression des protéines par spectrométrie de masse, contrairement aux gels 2D, ou les changements sont estimés par densitométrie. Cette technique se base sur l’incorporation d’un acide aminé « lourd » ou « léger » lors de la traduction des protéines lors des cultures cellulaire. L’incorporation de ces acides aminé va induire en spectrométrie de masse, un décalage de masse entre deux peptides de même séquence et rendre possible directement la comparaison des niveau d’expression a calculant le rapport d’intensité des deux pics. En comparant le protéomes mitochondrial, nous avons remarqué une augmentation générale du niveau d’expression de tous les enzymes du cycle de Krebs. Cette augmentation est accompagnée par une augmentation du niveau d’expression des NADH déshydrogénases interne et une diminution de la NADH déshydrogénase externe suggérant une augmentation de l’entrée des électrons dans la chaîne respiratoire via la production d’équivalents réducteurs par le cycle de Krebs plutôt que par les équivalent réducteurs issus du cytoplasme. En comparant les protéomes cellulaires, nous avons observés une diminution globale de toutes les protéines mitochondriales suggérant une diminution de la masse mitochondriales par cellules. Cette diminution est accompagnée par une augmentation générale de la glycolyse d’un facteur 2,5. [less ▲]

Detailed reference viewed: 37 (4 ULg)
See detailStructure and production of mesozooplankton in Lake Kivu (East Africa)
Isumbisho, Pascal; Sarmento, Hugo; Darchambeau, François ULg et al

Conference (2007, June 12)

See detailPlanktonic Archaea in Lake Kivu
Llirós, Marc; Darchambeau, François ULg; Plasencia, Anna et al

Conference (2007, June 12)

Detailed reference viewed: 9 (3 ULg)
See detailCarbon dioxide fluxes in Lake Kivu
Borges, Alberto ULg; Delille, Bruno ULg; Descy, Jean-Pierre et al

Conference (2007, June 12)

Detailed reference viewed: 5 (2 ULg)
Full Text
See detailLa défaillance des PME : processus et (auto)diagnostic
Crutzen, Nathalie ULg; Van Caillie, Didier ULg

Conference (2007, June 11)

This presentation provides both a large overview of the different processes leading to business failure in SMEs and a proposal of a structured tool organized as a self-diagnosis mechanism to prevent ... [more ▼]

This presentation provides both a large overview of the different processes leading to business failure in SMEs and a proposal of a structured tool organized as a self-diagnosis mechanism to prevent bankruptcy in a particular SME. [less ▲]

Detailed reference viewed: 158 (20 ULg)
See detailStructural Fire Safety Assessment through numerical modelling
Franssen, Jean-Marc ULg

Conference (2007, June 11)

Detailed reference viewed: 18 (2 ULg)
See detailTypologie physique des drogues de synthèse
Rubini, Aurore; Brostaux, Yves ULg

Conference (2007, June 11)

Detailed reference viewed: 59 (2 ULg)
Peer Reviewed
See detailMetafiction in Frame's Literature for Children
Delrez, Marc ULg

Conference (2007, June 08)

Detailed reference viewed: 5 (1 ULg)
Full Text
See detailUtilisation des techniques de traçage en hydrogéologie. Investigation et quantification des interactions rivière-nappe par traçage, monitoring des niveaux d'eau et modélisation
Brouyère, Serge ULg; Batlle-Aguilar, Jordi

Conference (2007, June 08)

Ce séminaire visait à présenter à des étudiants de l'EIER les grands principes des techniques de traçage en hydrogéologie, accompagné d'une illustration avec des résultats d'investigations menées sur un ... [more ▼]

Ce séminaire visait à présenter à des étudiants de l'EIER les grands principes des techniques de traçage en hydrogéologie, accompagné d'une illustration avec des résultats d'investigations menées sur un site contaminé. [less ▲]

Detailed reference viewed: 26 (0 ULg)
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See detailTop-Down Proteomics using Matrix-Enhanced ISD
Demeure, Kevin ULg; Quinton, Loïc ULg; Gabelica, Valérie ULg et al

Conference (2007, June 05)

Detailed reference viewed: 10 (1 ULg)
See detailNation und Publikum in der spanischen Literatur des 19. Jahrhunderts
Ceballos Viro, Alvaro ULg

Conference (2007, June 02)

Detailed reference viewed: 1 (0 ULg)
Peer Reviewed
See detailJanet Frame's Self-Writing
Delrez, Marc ULg

Conference (2007, June 02)

Detailed reference viewed: 5 (1 ULg)
See detailHydraulic modelling along river Ourthe considering impacts of climate change
Dewals, Benjamin ULg

Conference (2007, June 01)

Detailed reference viewed: 4 (1 ULg)
Full Text
See detailThe Faint Hot Component of Debris Disks Revealed by Infrared Interferometry
di Folco, E.; Absil, Olivier ULg; Augereau, J.-C. et al

Conference (2007, June 01)

Very few main-sequence stars exhibit warm dust in their 5-10AU close environment, where terrestrial planets are expected to have formed. Near-infrared interferometry is a powerful means, combining high ... [more ▼]

Very few main-sequence stars exhibit warm dust in their 5-10AU close environment, where terrestrial planets are expected to have formed. Near-infrared interferometry is a powerful means, combining high dynamic range and high spatial resolution, to directly detect faint emission from hot grains in exozodiacal clouds. We will review the results of our search for 2 micron excesses around Vega-like stars, including the nearby Sun-like stars Tau Ceti and Epsilon Eridani, with the FLUOR interferometric instrument and the CHARA Array of telescopes. Our recent detections, combined with Spitzer observations around 10 micron, put strong constrains on the properties and distribution of hot grains in these inner planetary systems. We will present the conclusions of our preliminary modeling for the detected hot grains as well as their implication for the selection of targets for future planet finding missions like DARWIN or TPF. [less ▲]

Detailed reference viewed: 4 (0 ULg)
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See detailHydraulic modelling along river Ourthe
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2007, June 01)

Detailed reference viewed: 12 (3 ULg)
Peer Reviewed
See detailExploration of the neuronal substrates of Directed Forgetting with fMRI
Feyers, Dorothée ULg; Hogge, Michaël; Salmon, Eric ULg et al

Conference (2007, June 01)

Detailed reference viewed: 10 (4 ULg)
Peer Reviewed
See detailEffect of 2D and 3D vision on the learning of fine motor skills according to the instrumental dimension: The case of minimal invasive surgery
Blavier, Adelaïde ULg; Nyssen, Anne-Sophie ULg

Conference (2007, June 01)

New technology in surgery is more and more present and allows to study cognitive processes in complex and natural environment. Comparing to classical minimal access surgery, a new robotic system allows to ... [more ▼]

New technology in surgery is more and more present and allows to study cognitive processes in complex and natural environment. Comparing to classical minimal access surgery, a new robotic system allows to recover a 3D view and all degrees of freedom for instruments movement. The purpose of this study was to evaluate the perceptual (2D vs 3D view) and instrumental (classical versus robotic) impacts of this new robotic system on learning curves. 40 medical students without any surgical experience were randomized into 4 groups (classical laparoscopy with 3D-direct view or with 2D-indirect view, robotic system in 3D or in 2D) and repeated a surgical task 6 times. After these 6 repetitions, they performed 2 trials with the same technique but in the other viewing condition (perceptive switch). Finally, subjects performed last three trials with the technique they never used (technical switch). We measured the speed, the accuracy and their subjective impressions about their performance (satisfaction, self-confidence and difficulty). Our results showed better performance and improvement in 3D view than in 2D view, whatever the instrumental aspect. Participants reported less mastery, familiarity, self-confidence and more difficulty in classical laparoscopy with 2D view than in the other conditions. In conclusion, robotic surgery improves surgical performance and learning, particularly by 3D view advantage. However, the bad performances after the perceptive and technical switches emphasize the need to adapt and pursue training also with traditional technology in order to prevent risks when a robotic procedure has to be converted in a classical laparoscopic procedure. [less ▲]

Detailed reference viewed: 14 (0 ULg)
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See detailAnalysis of hydraulic hybrid vehciles and economical comparison with hybrid electric vehicles
Louvigny, Yannick ULg; Nzisabira, Jonathan; Duysinx, Pierre ULg

Conference (2007, June 01)

Hybrid Hydraulic Vehicle (HHV) technology is an alternative to HEV. This technology deserves new attention because of recent development in reversible hydraulic motor pumps with high efficiency. The HHV ... [more ▼]

Hybrid Hydraulic Vehicle (HHV) technology is an alternative to HEV. This technology deserves new attention because of recent development in reversible hydraulic motor pumps with high efficiency. The HHV technology is based on parallel architecture of motor assist systems. A first preliminary study investigated the fuel consumption of a passenger car, a SUV and an urban bus. It clearly demonstrated that the fuel efficiency benefits are the better for heavy vehicles with frequent stops and starts. The second part of the work then compared both HEV and HHV buses. The fuel consumption is simulated using ADVISOR on the basis of 3 SORT driving cycles. The results showed that the HHV are penalized by his weight but they can be economically interesting because of the lower cost and longer life time of the hydraulic system. [less ▲]

Detailed reference viewed: 107 (15 ULg)
Peer Reviewed
See detailStructured covariance matrix estimation for the range-dependent problem in STAP
Neyt, Xavier; Druyts, Pascal; Acheroy, Marc et al

Conference (2007, June)

Detailed reference viewed: 7 (0 ULg)
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Peer Reviewed
See detailConfiance et commerce électronique: une problématique différenciée selon la nature des transactions
Lisein, Olivier ULg

Conference (2007, June)

Malgré la hausse sensible que connaît l’e-commerce, la problématique de la confiance afférente aux transactions électroniques reste d’actualité. Axée sur les choix des entreprises en matière d’e-business ... [more ▼]

Malgré la hausse sensible que connaît l’e-commerce, la problématique de la confiance afférente aux transactions électroniques reste d’actualité. Axée sur les choix des entreprises en matière d’e-business/e-commerce, notre contribution propose d’analyser l’influence qu’est susceptible de revêtir à cet égard la nature des transactions, vue sous les caractéristiques de spécificité des actifs et de récurrence de la relation (Williamson, 1975, 1985). Il en résulte quatre comportements distincts de la part des entreprises, en lien avec leur perception des enjeux liés à la confiance et au risque entourant les transactions électroniques. Basé sur l’analyse transversale d’une vingtaine d’études de cas, notre propos met ainsi en évidence des positionnements stratégiques contrastés et un recours à des mécanismes de protection différents suivant la spécificité des actifs échangés et la récurrence de la relation entretenue avec les cocontractants. [less ▲]

Detailed reference viewed: 171 (12 ULg)
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Peer Reviewed
See detailEnergy audit of air conditioning systems
Andre, Philippe ULg; Hannay, Cl.; Hannay, J. et al

Conference (2007, June)

The work presented here consists in developing an audit methodology, with appropriate simulation tools and benchmarks. Several case studies are used to support, to test and to illustrate these ... [more ▼]

The work presented here consists in developing an audit methodology, with appropriate simulation tools and benchmarks. Several case studies are used to support, to test and to illustrate these developments. Each case study is described according to a standard format, in order to make the data easy to re-use in the future. The audit of the HVAC system consists in analyzing the information available about actual energy performances and in identifying the most attractive retrofit opportunities. Focus is given here to cooling energy consumption, but it could never be completely dissociated from heating requirements. An example of case study is presented in the paper to give a first idea of what could be the (difficult) task of the energy auditor. One of the main difficulties comes from the too many information lacks. Filling these lacks would require, in most case, more detailed energy records on site. Simulation models may help a lot, for a better interpretation of on site records and also for a safe identification of the most promising retrofit opportunities. Such models and examples of simulations are presented in the paper. [less ▲]

Detailed reference viewed: 39 (5 ULg)