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See detailConstruction of high-resolution trace element time-series in Belgian speleothems by LA-ICP-MS
Allan, Mohammed ULg; verheyden, sophie; crucifix, michel et al

Conference (2017, August 17)

Speleothems, presented in Belgium, are now regarded as valuable archive of paelenvirenmental variations on the continents, offering a number of advantages relative to other continental climate proxy ... [more ▼]

Speleothems, presented in Belgium, are now regarded as valuable archive of paelenvirenmental variations on the continents, offering a number of advantages relative to other continental climate proxy recorders such as lake sediments. They are reliable continental archives of high interest due to their dating possibilities and their possibility to preserve multi-proxy records of environmental and climatic dynamics. Establishing high-resolution trace element time series in speleothems requires analytical techniques capable of representative sampling at sub-annual spatial resolution (on order of 22 µm in this study). In the Belgian Pere Noel cave (PN), high spatial resolution measurements of trace elements (e.g., Mg, Sr, Ba) were realized by using LA-ICP-MS and compared with results from lower resolution techniques (ICP-MS). The results from both techniques have been analysed in order to assess the capability of each technique to reconstruct climate changes at high resolution from PN stalagmite. Results showed that LA-ICP-MS technique allows a rapid analysis of multiple elemental concentrations, and uses minimal sample volume allowing for replicate sampling and availability of almost the entire original sample for other analyses. [less ▲]

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See detailCompositional gap at La Picada (CSVZ, Chile) results from critical cristallinity and compaction
Vander Auwera, Jacqueline ULg; Namur, Olivier ULg; Coumont, Valentin et al

Poster (2017, August 16)

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See detailSense-Making in Cyber Security - Examining Responder Behaviors in Cyber-Attacks
Tapanainen, Tommi ULg

in Proceedings of the Americas Conference on Information Systems (AMCIS) (2017, August 12)

Our understanding of the defense mechanisms against cyber-attacks is, to a great extent, based on preparation and deterrence. There is limited understanding, and in particular, limited evidence on how ... [more ▼]

Our understanding of the defense mechanisms against cyber-attacks is, to a great extent, based on preparation and deterrence. There is limited understanding, and in particular, limited evidence on how cyber security responders act to contain and recover from a cyber-attack. The actions of responders, including IT experts, corporate communications staff, and selected managers are critical. To address this gap, this research proposes applying the concept of sense-making, which has been extensively used to analyze human crisis behaviors. In this emerging research, we conduct an investigation into a cyber-attack case to shed light on the contextual and collective activities taken by responders in coping with cyber-attack response. We expect the results to validate or challenge theorizations of cyber security training and competencies from the communication and collaboration perspective. In a practical sense, our research can stimulate organizations to reflect on their own cyber security preparedness from the human perspective. [less ▲]

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See detailState of Martian Upper Atmosphere as Observed by Imaging Ultraviolet Spectroscope Onboard MAVEN
Jain; Stewart; Deighan et al

Conference (2017, August 09)

NASA’s MAVEN spacecraft has taken more than two earth years (one Martian year) of observations of Mars to understand the process of Martian atmospheric evolution. The Imaging Ultraviolet Spectrograph ... [more ▼]

NASA’s MAVEN spacecraft has taken more than two earth years (one Martian year) of observations of Mars to understand the process of Martian atmospheric evolution. The Imaging Ultraviolet Spectrograph (IUVS) on board MAVEN observes Mars in far and mid ultraviolet (110-340 nm) with unique scanning and pointing capabilities, which are optimized for airglow studies. Dayglow emissions observed on Mars are a perfect tracer for the processes occurring in the emitting region of the atmosphere (100-200 km) and provide basic information about atmospheric composition (and its structure), and give insight into the dynamics, energetics, and physics and chemistry of the thermosphere. With its wide spatial and temporal coverage, IUVS observations of Martian dayglow has contributed immensely to our understanding of the Martian upper atmosphere and its response to incoming solar flux (EUV/FUV) and coupling between lower and upper atmosphere through tides and waves. In this presentation, I will talk about an overview of scientific results obtained by IUVS dayglow measurements, including (1) spatial/temporal distribution of major MUV and FUV emissions and their seasonal variability; (2) the seasonal variation of thermosphere temperatures inferred from dayglow measurements; (3) the effect of solar EUV flux (including the ~27-day solar rotation) and heliocentric distance on upper atmosphere temperature structure. We will present an overview of these results and a discussion of their implications for the state of the Martian upper atmosphere. [less ▲]

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See detailORBi : an institutional repository to promote Open Access
Chalono, Dominique ULg; Thirion, Paul ULg

Conference (2017, August 09)

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See detailHydrogen Loss from Mars: Seasonal and Sourced from Upper Atmospheric Water
Chaffin; Deighan; Stewart et al

Conference (2017, August 09)

Mars has lost a significant fraction of its initial water inventory to space over its history. This loss proceeds via a chemical chain initiated in the lower and middle atmosphere below 100 km altitude ... [more ▼]

Mars has lost a significant fraction of its initial water inventory to space over its history. This loss proceeds via a chemical chain initiated in the lower and middle atmosphere below 100 km altitude, which results in H escape to space in the collisionless corona above about 200 km altitude. Hydrogen loss from Mars is tracked via brigtness measurements of this corona in Lyman alpha light at 121.6 nm, which is scattered by neutral H orbiting and escaping the planet. Here we present observations of H escape variability made by the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) that demonstrate the seasonal dependence of H escape, adding to evidence initially gathered by Mars Express and the Hubble Space Telescope. We show that for two Mars years the atmosphere has exhibited enhanced H escape in Southern Summer near perihelion. We also present the result of photochemical model calculations which demonstrate that this variation can be explained as a result of high concentrations of water vapor in the upper atmosphere, consistent with Mars Express solar occultation measurements and several general circulation models. Our results demonstrate that the large variations in H escape at high altitudes can be driven by lower atmospheric dynamics, suggesting that Mars hydrogen escape may depend on climate, in addition to the long-term evolution of Martian climate depending on atmospheric escape. [less ▲]

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See detailScience Highlights from MAVEN/IUVS After Two Years in Mars Orbit
Jain; Schneider; Stiepen, Arnaud ULg et al

Conference (2017, August 08)

The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) observes Mars in the far and mid ultraviolet (110-340 nm), investigating lower and upper atmospheric ... [more ▼]

The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) observes Mars in the far and mid ultraviolet (110-340 nm), investigating lower and upper atmospheric structure and indirectly probing neutral atmospheric escape. The instrument is among the most powerful spectrographs sent to another planet, with several key capabilities: separate Far-UV & Mid-UV channels for stray light control; a high-resolution echelle mode to resolve deuterium and hydrogen emission; internal instrument pointing and scanning capabilities to allow complete mapping and nearly continuous operation; and optimization for airglow studies. After two Earth years in orbit (one Mars year), IUVS has assembled a large quantity of data and provided insights on present-day processes at Mars including dayglow, nightglow, aurora, meteor showers, clouds, and solar-planetary interactions. In this presentation, we will highlight several new discoveries made by IUVS. Among the key results obtained by IUVS are: (1) discovery of the widespread occurrence of a diffuse proton aurora representing a previously unknown source of energy deposition into the atmospheres of unmagnetized planets; (2) first spatial mapping of nitric oxide nightglow reveals regions of atmospheric downwelling necessitating substantial changes to global atmospheric circulation models; (3) a new high-spatial-resolution UV imaging mode allows detection of clouds from nadir to limb and their local time evolution, as well as unprecedented determinations of Mars’ low-altitude ozone; (4) discovery of a persistent meteoric metal layer in Martian atmosphere; (5) atmospheric structure, composition and dynamics from stellar occultation. We will present an overview of these results and a discussion of their implications for characterizing the state of the atmosphere and its evolution. [less ▲]

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See detailMAVEN/IUVS Observations of the Reflectance Spectrum of Phobos
Chaffin; Deighan; Schneider et al

Conference (2017, August 08)

The Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft occasionally has close encounter seasons with Phobos as a consequence of its orbital precession and its apoapsis being near the orbit of the ... [more ▼]

The Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft occasionally has close encounter seasons with Phobos as a consequence of its orbital precession and its apoapsis being near the orbit of the moon. During one encounter season in late 2015, MAVEN's Imaging Ultraviolet Spectrograph (IUVS) was able to gather the first ever spectral images of the moon in the mid-ultraviolet. During these flybys, IUVS was able to observe the trailing hemisphere of the moon, producing spectra useful for comparison with the Mariner 9 Ultraviolet Spectrometer measurements, which observed only the moon's leading side. The IUVS data reveal that the trailing side of the Moon is bluer than the leading side, indicating possible differences in the weathering history of the hemispheres. In addition, we see some evidence for an absorption feature longward of 300 nm, potentially produced by organic compounds, in accordance with Mariner 9 and SPICAM/UV observations. We will present an overview of our images and spectra and a discussion of their interpretation for the history and formation of Phobos. [less ▲]

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See detailEt si on se passait (complètement) des sciences humaines ?
Winand, Jean ULg

Conference (2017, August 06)

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See detailHistories of Comics by its Makers. Contemporary Graphic Novels and the Heritage of Comics
Crucifix, Benoît ULg

Conference (2017, August 03)

PhD project presentation

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See detailLos ingrávidos de Valeria Luiselli: entre fantástico y autoficción
Licata, Nicolas ULg

Conference (2017, August 03)

En 2011, la escritora mexicana Valeria Luiselli publica su primera novela, Los ingrávidos, cuyo título alude al proceso de afantasmamiento de los dos narradores: una narradora notablemente similar a la ... [more ▼]

En 2011, la escritora mexicana Valeria Luiselli publica su primera novela, Los ingrávidos, cuyo título alude al proceso de afantasmamiento de los dos narradores: una narradora notablemente similar a la propia Luiselli y el poeta mexicano Gilberto Owen. Narración en primera persona y parecidos con el autor por un lado, fenómenos indiscutiblemente inverosímiles por otro, el libro reúne todos los ingredientes de lo que el teórico francés Vincent Colonna llamó “autoficción fantástica”. Sin embargo, en una de sus entrevistas, Luiselli declara que “no quería escribir una novela fantástica”, y, más aún, “que [se] moriría si alguien dice que Los ingrávidos es una novela de ese estilo, estaría profundamente indignada” (Barbosa Vera, Scofaulos 2012). Aunque el efecto fantástico no siempre dependa de la intención de un autor, en este caso preciso Valeria Luiselli parece tener razón. De hecho, un examen detenido de la obra revela una antinomia: sin ser fantástica, Los ingrávidos es una autoficción “de ese estilo”. Es sobre esa antinomia que esta comunicación inclina la perspectiva. Después de un sucinto resumen, nos centremos en primer lugar en los indicios autoficcionales de la novela y luego en sus componentes fantásticos, examinando con más detenimiento los que impiden que el libro se adhiera a esa modalidad, a saber, los moduladores de duda, los comentarios metadiegéticos y la no fiabilidad de la narradora. [less ▲]

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See detailUniversally dispreferred structures through change. The diachrony of affix ordering in Egyptian-Coptic
Grossman, Eitan; Polis, Stéphane ULg

Conference (2017, August 01)

It has been repeatedly observed, on the basis of typological ‘big data,’ that there is a worldwide preference for suffixes as opposed to prefixes. This can be explained in several ways. A possible ... [more ▼]

It has been repeatedly observed, on the basis of typological ‘big data,’ that there is a worldwide preference for suffixes as opposed to prefixes. This can be explained in several ways. A possible explanation is that this feature is a world-wide retention from Proto-World, or is prone to diffusion through language contact. Another possible explanation is that suffixes are preferred for some reason in Universal Grammar or for hitherto unclear general cognitive reasons (Caballero et al. 2008). Yet another explanation is that suffixes are more prone to be created through regular processes of language change, e.g., grammaticalization (Bybee 1985), perhaps due to online usage factors (Himmelmann 2014). The explanation of this preference is directly relevant to a question highlighted in Good (2008), namely, the relationship between language universals and language change: do synchronic structural universals constrain change, or do diachronic universals, ultimately motivated by synchronic usage factors, give rise to synchronic universals? Kiparsky (2008) argues that the form of synchronic grammars constrains change, i.e., languages should not be able to change in such a way that they flout Universal Grammar. On the other hand, for Bybee (2008), the most robust universals are in fact universals of language change, and synchronic states are in a sense epiphenoma. For this question, apparently ‘counter-directional’ changes are crucial: why should language change lead to universally dispreferred distributions of linguistic structures? n this paper, we argue that universally dispreferred structures can and do arise as the result of regular language change, given the right background structures as the particular ‘ecology’ in which change takes place. Specifically, we show that Ancient Egyptian-Coptic (Afroasiatic), shows a long-term diachronic macro-change from mixed suffixing-prefixing to an overwhelming preference for prefixing. The empirical basis for this study is a comparison of ten typologically-significant parameters in which prefixing or affixing is at stake, based on Dryer’s (2013) 969-language sample. With its extremely high prefixing preference, Coptic belongs to the rare 6% or so of languages that are predominantly prefixing (Tables 1,2). Moreover, it has a higher prefixing index (11) than any other language in Dryer’s 969-language sample. The closest competitor is Hunde (Bantu; Democratic Republic of Congo), with a prefixing index of 9.5. In terms of areality, Coptic is an outlier: in mediterranean northern Africa, Coptic is the only language that is predominantly prefixing. We argue that each of the micro-changes implicated in this macro-change are better understood in terms of changes at the level of individual constructions, via grammaticalization, rather than in terms of a broad structural ‘drift.’ Crucially, there is nothing unusual about the actual processes of change themselves; what may be unusual, from a cross-linguistic point of view, is the length of uninterrupted documentation of a single language, which allows us to observe long-term changes with abundant evidence. In short, we argue that Ancient Egyptian-Coptic looks as though it is swimming against the typological tide, although it is constantly paddling along with the usual tides of language change. [less ▲]

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See detailPrevalence of voice disorders among teachers at the beginning of their career
Schiller, Isabel ULg

Poster (2017, August)

Due to the high vocal demands associated with their profession, teachers face an increased risk of developing voice disorders. Research suggests that up to 50 % of experienced teachers are affected. Even ... [more ▼]

Due to the high vocal demands associated with their profession, teachers face an increased risk of developing voice disorders. Research suggests that up to 50 % of experienced teachers are affected. Even student teachers, whose vocal load is still relatively low, report voice problems with a frequency of 20 % (Simberg, Laine, Sala, & Rönnemaa, 2000). Little is known about the prevalence of voice disorders among teachers at the very beginning of their career. In Germany, teachers must complete a two-year teaching practice as part of their professional training after they graduate from university, consisting of attending specialized courses and giving lessons. The aim of this symptom-based study was to determine the prevalence of voice problems among this population. A self-administered questionnaire was answered by 73 German teachers in teaching practice. The prevalence of a voice problem was defined based on the presence of two symptoms that persisted for a minimum of two weeks. Results revealed that 37 % of teachers had voice problems during their teaching practice. Among the most frequent symptoms were hoarseness, an urge to clear one’s throat and problems speaking at a loud voice. Considering that the participants had not even begun teaching full-time, the prevalence of reported voice problems is worrisome. It could be associated with their lacking experience in how to use their voice effectively. The findings highlight the necessity of early intervention programs focusing on vocal hygiene and effective voice use in classroom situations. [less ▲]

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See detailAs teorias semióticas face à fotografia
Dondero, Maria Giulia ULg

in Calavari, Suzi; Rodrigues, Angelica; Rocha, Nildicéia (Eds.) Proceedings VI SELIN – NOVAS PRÁTICAS EM PESQUISA SOBRE A LINGUAGEM: ROMPENDO FRONTEIRAS (2017, August)

Dans ce texte, je me propose de revenir sur les travaux en sémiotique qui ont marqué les études du champ interdisciplinaire de la photographie et de les poursuivre; l’objectif principal est de fournir ... [more ▼]

Dans ce texte, je me propose de revenir sur les travaux en sémiotique qui ont marqué les études du champ interdisciplinaire de la photographie et de les poursuivre; l’objectif principal est de fournir quelques pistes pour étudier, d’un point de vue sémiotique, l’image photographique en tant qu’objet pris dans des pratiques d’usage et d’interprétation diversifiées au sein des statuts sociaux de l’art, de la science, de la religion. [less ▲]

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See detailNETPerfTrace – Predicting Internet Path Dynamics and Performance with Machine Learning
Wassermann, Sarah ULg; Casas, Pedro; Cuvelier, Thibaut ULg et al

in Proceedings of Big-DAMA ’17 (2017, August)

We study the problem of predicting Internet path changes and path performance using traceroute measurements and machine learning models. Path changes are frequently linked to path inflation and ... [more ▼]

We study the problem of predicting Internet path changes and path performance using traceroute measurements and machine learning models. Path changes are frequently linked to path inflation and performance degradation, therefore the relevance of the problem. We introduce NETPerfTrace, an Internet Path Tracking system to forecast path changes and path latency variations. By relying on decision trees and using empirical distribution-based input features, we show that NETPerfTrace can predict (i) the remaining life time of a path before it actually changes and (ii) the number of path changes in a certain time period with relatively high accuracy. Through extensive evaluation, we demonstrate that NETPerfTrace highly outperforms DTRACK, a previous system with the same prediction targets. NETPerfTrace also offers path performance forecasting capabilities. In particular, our tool can predict path latency metrics, providing a system which can not only predict path changes, but also forecast their impact in terms of performance variations. We release NETPerfTrace as open software to the networking community, as well as all evaluation datasets. [less ▲]

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See detailInfluence of urban patterns on flooding
Bruwier, Martin ULg; Mustafa, Ahmed; Aliaga, Daniel et al

in E-proceedings of the 37th IAHR World Congress (2017, August)

The goal of this paper is to identify the respective influence of different characteristics of urban patterns on urban flooding. A set of 2,290 alternate urban patterns was generated randomly using an ... [more ▼]

The goal of this paper is to identify the respective influence of different characteristics of urban patterns on urban flooding. A set of 2,290 alternate urban patterns was generated randomly using an urban generator tool providing the geometry of buildings and their relative location to the ground, over a square area of 1 km². Steady 2-D hydraulic computations were performed for these 2,290 different urban patterns with identical hydraulic boundary conditions. The computational time was reduced by using an anisotropic porosity model. This model uses relatively coarse computational cells; but preserves information from the detailed topographic data through the use of porosity parameters. Based on the computed maps of waterdepths for the 2,290 urban patterns, a sensitivity analysis based on a multiple linear regression was performed to outline the most influential urban characteristics. [less ▲]

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See detailForeseeing New Control Challenges in Electricity Prosumer Communities
Olivier, Frédéric ULg; Marulli, Daniele; Ernst, Damien ULg et al

in Proc. of the 10th Bulk Power Systems Dynamics and Control Symposium – IREP’2017 (2017, August)

This paper is dedicated to electricity prosumer communities, which are groups of people producing, sharing and consuming electricity locally. This paper focuses on building a rigorous mathematical ... [more ▼]

This paper is dedicated to electricity prosumer communities, which are groups of people producing, sharing and consuming electricity locally. This paper focuses on building a rigorous mathematical framework in order to formalise sequen- tial decision making problems that may soon be encountered within electricity prosumer communities. After introducing our formalism, we propose a set of optimisation problems reflecting several types of theoretically optimal behaviours for energy exchanges between prosumers. We then discuss the advantages and disadvantages of centralised and decentralised schemes and provide illustrations of decision making strategies, allowing a prosumer community to generate more distributed electricity (compared to commonly applied strategies) by mitigating over- voltages over a low-voltage feeder. We finally investigate how to design distributed control schemes that may contribute reaching (at least partially) the objectives of the community, by resort in to machine learning techniques to extract, from centralised solution(s), decision making patterns to be applied locally. First empirical results show that, even after a post-processing phase so that it satisfies physical constraints, the learning approach still performs better than predetermined strategies targeting safety first, then cost minimisation. [less ▲]

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See detailCharacterising Industrial Sites' Flexibility with Reservoir Models
Cuvelier, Thibaut ULg

Poster (2017, August)

Electro-intensive industrial sites are very dependent on electricity prices to remain competitive. Nevertheless, they can often tune their processes in order to decrease their electricity consumption ... [more ▼]

Electro-intensive industrial sites are very dependent on electricity prices to remain competitive. Nevertheless, they can often tune their processes in order to decrease their electricity consumption during the most critical periods, for example by using decision support systems based on mathematical modelling of their processes. Our goal is to estimate the flexibility potential of a complete site, not to tune each process very precisely. To this end, we propose a generic paradigm to help conceiving such models: reservoirs are the basic building block, which allows for great expressiveness while being close to the physics. More specifically, we do not need very precise models for our purposes, but ones that can be efficiently included in optimisation models. Our first results show that the obtained reservoir models can give sufficiently good approximations for metallurgical processes (more precisely, electric-arc and ladle furnaces). [less ▲]

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See detailAssessing quality of life using structural equation modeling
Dardenne, Nadia ULg; Pétré, Benoît ULg; Husson, Eddy ULg et al

Poster (2017, August)

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See detailGiving an account of fictional discourse. Meinongian logics versus modal logics
Leclercq, Bruno ULg

Conference (2017, August)

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See detailVoice use among music theory teachers
Schiller, Isabel ULg; Morsomme, Dominique ULg; Sfez, Lou et al

Conference (2017, August)

In Belgium, there is a particular group of music teachers referred to as music theory teachers. Working at music schools, they convey theoretical knowledge and practical musical skills to groups of ... [more ▼]

In Belgium, there is a particular group of music teachers referred to as music theory teachers. Working at music schools, they convey theoretical knowledge and practical musical skills to groups of individuals who learn music during their free-time. Even though music theory teachers use both speaking and singing voice intensively at work, little is known about their voice use profiles. This study investigated the vocal loading among French-speaking music theory teachers. Objectives were (1) to describe their professional and extra-professional vocal loading, (2) to determine the relationship between vocal loading and background noise level and (3) to investigate whether objectively measured vocal loading is reflected in music theory teachers’ auto-evaluation of their voice. Using voice dosimetry, 13 music theory teachers were monitored for one workweek. Parameters analysed were F0, voice sound pressure level (SPL), phonation time, vocal loading index (VLI) and background noise SPL. At the end of each monitoring day, subjects self-assessed their voice use by means of visual analogue scales. Results revealed (1) significantly higher vocal loading in the professional context than in the extra-professional context, (2) significant positive correlations between background noise level and the parameters F0, voice SPL and phonation time and (3) significant correlations between the VLI and auto-evaluation data (e.g. voice quality and vocal fatigue). These results highlight that teaching music theory is a profession with high vocal demands. At work, music theory teachers are exposed to high background noise, which seems to influence their voice use and may potentially contribute to the development of voice problems among this population. Visual analogue scales provide a promising tool to subjectively investigate vocal loading among music theory teachers. [less ▲]

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See detailPhysical modeling of overtopping induced fluvial dike failure: effects of the channel flow and floodplain innundation
Rifai, Ismail; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

Conference (2017, August)

Fluvial dikes have been constructed as flood defense structures, but their failure may lead to casualties and major damages in the protected areas. Flow overtopping is listed as the main cause of dike ... [more ▼]

Fluvial dikes have been constructed as flood defense structures, but their failure may lead to casualties and major damages in the protected areas. Flow overtopping is listed as the main cause of dike failure. An accurate assessment of the breach evolution is a prerequisite to a sound flood risk assessment and management. in contrast, the current knowledge of the physical processes involved in fluvial dike failure by overtopping remains highly fragmented. This paper presents experimental tests on the breaching of homogenous sand-dikes in a fluvial configuration, i.e. the flow is parallel to the longitudinal dike axis. Overtopping is initiated over a pilot notch at the dike crest. Experiments are performed for different inflow discharges in the main channel and under different levels of floodplain confinement. The transient evolution of the dike geometry is monitored using a laser profilometry technique. The detailed reconstruction of the breach formation and expansion provides key insights into the mechanisms involved in the failure of fluvial dikes. Results show that the breach development differs highly from experiments disregarding the flow parallel to the dike axis (i.e. frontal configuration) as in the fluvial configuration the breach develops mainly in the flow direction and the floodplain water level strongly conditions the breach horizontal and vertical extent. [less ▲]

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See detailAn efficient algorithm to decide periodicity of b-recognisable sets using MSDF convention
Boigelot, Bernard ULg; Mainz, Isabelle ULg; Marsault, Victor ULg et al

in Leibniz International Proceedings in Informatics (2017, August), 80

Given an integer base b>1, a set of integers is represented in base b by a language over {0,1,...,b-1}. The set is said to be b-recognisable if its representation is a regular language. It is known that ... [more ▼]

Given an integer base b>1, a set of integers is represented in base b by a language over {0,1,...,b-1}. The set is said to be b-recognisable if its representation is a regular language. It is known that eventually periodic sets are b-recognisable in every base b, and Cobham's theorem implies the converse: no other set is b-recognisable in every base b. We are interested in deciding whether a $b$-recognisable set of integers (given as a finite automaton) is eventually periodic. Honkala showed that this problem is decidable in 1986 and recent developments give efficient decision algorithms. However, they only work when the integers are written with the least significant digit first. In this work, we consider the natural order of digits (Most Significant Digit First) and give a quasi-linear algorithm to solve the problem in this case. [less ▲]

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See detailEarly eukaryotes: insights from microanalyses of proterozoic microfossils
Cornet, Yohan ULg; Beghin, Jérémie ULg; Kabamba Baludikay, Blaise ULg et al

in Goldschmidt Abstracts, 2017 (2017, August)

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See detailDynamicized semantic maps of content words. Comparing long-term lexical changes in Ancient Egyptian and Greek
Georgakopoulos, Athanasios ULg; Polis, Stéphane ULg

Conference (2017, July 31)

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected ... [more ▼]

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected the meanings of words in the course of the Ancient Egyptian and of the Ancient Greek language history are investigated. [less ▲]

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See detailHigh School Sport in Belgium (Wallonia)
Cloes, Marc ULg

Conference (2017, July 31)

In Belgium, since 1969, sport is a competence under the control of public authorities defined according to the linguistic regime. As in most Western European countries, sport has been compartmentalised by ... [more ▼]

In Belgium, since 1969, sport is a competence under the control of public authorities defined according to the linguistic regime. As in most Western European countries, sport has been compartmentalised by giving rise to three main types of practice: "professional", "traditional" and "alternative" sports (Diegel, 1995). Clubs linked to sports federations constitute the local setting up of the sports organization, which is largely a majority (Zintz, 2014). Other operators from the public domain and the private sphere coexist (Cloes, 2012). In the school environment, sport can be found in three contexts: within the compulsory curriculum (physical education), integrated to extracurricular activities (activities organized during recess or free periods), and peripheral activities (use of school sports facilities by organizers who are not belonging to the school actors). If inter-school competitions are organized by several school sports federations (depending to the educational network), they are far from reaching the interest and involvement reached by the competitions managed by the traditional sports federations. So there is hardly any systematic sports training in French-speaking Belgian schools. Some PE teachers propose voluntary training sessions but there are less and less connections between their actions and sport clubs. On the other hand, young sportsmen appointed by the Minister of Sports have a special status enabling them to benefit facilities to pursue their double career. They are sometimes gathered in special organizations - sport-studies or development centers - which have been the subject of several studies (Cloes et al., 2002, Lacrosse et al., 2014, Theunissen et al., 2016) but PE teachers are very few involved in these development opportunities. In many situations of partnership between the school and sports structures, their role is often limited to a simple accompanying action (sports days, projects "My club-My school." Cloes (2017) insisted however on the need to make them a priority in the coordination of the preparation of physically educated citizens. References Cloes, M. (2012). La Wallonie en mouvement : vers une culture sportive et de l’activité physique ? In, M. Germain et R. Robaye (Eds.), L'état de la Wallonie. Portrait d'un pays et de ses habitants – 2011. (pp. 70-80). Namur : Les éditions namuroises. Available on Internet : http://hdl.handle.net/2268/117294 Cloes, M. (2017). Preparing physically educated citizens in physical education. Expectations and practices. Retos, 31, 245-251. Available on Internet : http://recyt.fecyt.es/index.php/retos/article/view/53497/32304 Cloes, M., Schelings, V., Ledent, M, & Piéron, M. (2002). Sport-études : comparaison des caractéristiques motivationnelles et des relations sociales des élèves sportifs et de leurs condisciples. eJRIEPS (e Journal de la Recherche sur l'Intervention en Éducation Physique et Sport), 1, 57-72. Available on Internet: http://hdl.handle.net/2268/10187 Diegel, H. (1995). Sport in changing society – Sociological essays. Schorndorf: Verlag Karl Haufmann. Lacrosse, Z., Martin, V., & Cloes, M. (2014, July). Analyse qualitative du fonctionnement du centre de formation d’une fédération sportive. Paper presented at the 8ème biennale de l’ARIS ‘Temps, temporalités et intervention en EPS et en sport’, Genève, Suisse. Available on Internet: http://hdl.handle.net/2268/170020 Theunissen, C., Meys, G., & Cloes, M. (2016). Encadrement du staff autour du double projet des sportifs dans un centre de formation en handball. Revue de l’Éducation physique, 56, 1/2, 20. Disponible sur Internet: http://yessport.be/educationphysique/file/REVUE_1_ET_2_2016_-2eme_COLLOQUE_GUY_NAMUROIS.pdf ou http://orbi.ulg.ac.be/handle/2268/199016 Zintz, T. (2014). Module 3 - Le paysage sportif : du pratiquant aux fédérations. Thématique 1 - Cadre institutionnel et législatif. Cours généraux de la formation ‘Moniteur Sportif Initiateur’. Brussels, Belgium : Administration des sports, Fédération Wallonie-Bruxelles. Internet : http://www.sport.cfwb.be/index.php?id=7370 [less ▲]

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See detailEl impacto del fin del “giro al la izquierda” sobre las relaciones entre China y América Latina
Wintgens, Sophie ULg

Conference (2017, July 28)

La llegada de China en América Latina a finales de los años 2000 se ha presentado como una nueva opción en el contexto histórico de un “movimiento pendular” que siempre ha visto los países latino ... [more ▼]

La llegada de China en América Latina a finales de los años 2000 se ha presentado como una nueva opción en el contexto histórico de un “movimiento pendular” que siempre ha visto los países latino-americanos girar principalmente en torno a Europa y sus antiguas potencias coloniales o en torno a los Estados Unidos. En el marco de esa dinámica del “triángulo Atlántico” en la que se encuentra encerrada América Latina, China ha también beneficiado de un entorno regional propicio como consecuencia de factores tanto estructurales (las debilidades del regionalismo latinoamericano), como coyunturales (la escalada de la “nueva” izquierda sudamericana). El inicio de la década de 2010, sin embargo, parece marcar el final del “giro à la izquierda” y los límites del modelo de desarrollo extractivo adoptado por la mayoría de los gobiernos progresistas latino-americanos. Al mismo tiempo, las autoridades chinas han también iniciado un cambio de modelo de desarrollo económico con el undécimo Plan Quinquenal (2006-2010) para que sea más autocentrado y basado en la producción de productos de alta calidad. Basándose en estas observaciones, este ponencia interroga el impacto de este contexto sobre las relaciones entre China y América Latina. [less ▲]

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See detailBuilding flow and transport models with electrical resistivity tomography data
Gottschalk, Ian; Hermans, Thomas ULg; Knight, Rosemary et al

Poster (2017, July 26)

Aquifer recharge and recovery (ARR) is the process of enhancing natural groundwater resources and recovering water for later use by constructing engineered conveyances. Insufficient understanding of ... [more ▼]

Aquifer recharge and recovery (ARR) is the process of enhancing natural groundwater resources and recovering water for later use by constructing engineered conveyances. Insufficient understanding of lithological heterogeneity at ARR sites often hinders attempts to predict where and how quickly infiltrating water will flow in the subsurface, which can adversely affect the quality and quantity of available water in the ARR site. In this study, we explored the use of electrical resistivity tomography (ERT) to assist in characterizing lithological heterogeneity at an ARR site, so as to incorporate it into a flow and contaminant transport model. In this case, we had non-collocated well core log data and ERT data from a full-scale ARR basin. We compared three independent methods for producing conditional lithology-resistivity probability distributions: 1) a search template to relate the nearest logged well lithologies with ERT resistivity panels, given search criteria; 2) a maximum likelihood estimation (MLE) to match bimodal normal distributions to the histogram of each ERT line; and 3) variogram-based lithology indicator simulations constrained to well data. Each approach leverages Bayes’ Rule to estimate lithology probability given electrical resistivity. The simplest approach (method 1) yields an erroneous conditional probability function where sand dominates the conditional probability at nearly all resistivities, due in part to the strong presence of sand in the wells nearest the ERT lines. The approaches using MLE and lithology simulations (methods 2 and 3) produce similar, more realistic lithofacies probability functions. The range of resistivities where clay and sand overlap differs between methods 2 and 3: ranging between 100 and 200 ohm-m for method 2, and between 30 and 50 ohm-m for the method 3. These differences affect the posterior lithology distributions in multiple point geostatistical (MPS) simulations, and in turn, predictions of flow from models which integrate these results. To test the models, we can compare measured breakthrough times of recharged water at the site to groundwater flow simulation results using the lithofacies models created by each method. The methods described here can inform the integration of non-collocated geophysical data into a variety of applications. [less ▲]

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See detailComprehensive Ion Mobility Calibration Strategies based on Synthetic Polymers
Haler, Jean ULg; Kune, Christopher ULg; Chirot, Fabien et al

Conference (2017, July 24)

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See detailHARMONIC BALANCE COMPUTATION OF THE NONLINEAR FREQUENCY RESPONSE OF A THIN PLATE
Lee, Jongsuh ULg; Kerschen, Gaëtan ULg; Detroux, Thibaut ULg

Conference (2017, July 24)

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of ... [more ▼]

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of motion are developed by the principle virtual work. Moreover, the nonlinear frequency response curves, or NFRCs, are obtained by a continuation method. [less ▲]

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See detailFunctional and structural characterisation of the Arabidopsis thaliana HMA4 protein
Lekeux, Gilles ULg; Laurent, Clémentine; Xiao, Zhiguang et al

Poster (2017, July 24)

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See detailDual-specificity-phosphatase 3 (DUSP3) deletion promotes liver inflammation and high fat diet-induced hepatocellular carcinoma
Jacques, Sophie ULg; Arjomand, Arash ULg; Vandereyken, Maud ULg et al

Poster (2017, July 24)

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently ... [more ▼]

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently generated a full DUSP3 knockout (KO) mouse. The obtained mice were born normal with no spontaneous phenotype. However, while aging, DUSP3-KO mice became obese and developed hepatosteatosis. The phenotype was exacerbated under high fat diet (HFD). Furthermore, when treated with diethylnitrosamine (DEN) procarcinogen, DUSP3-KO mice developed HCC faster than WT littermates. The combination of DEN with HFD accelerated the onset of HCC development in these mice compared to WT mice. This was associated with increased systemic levels of several metabolites and with hyperphosphorylation of the insulin-like growth factor receptor I. [less ▲]

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See detailEffects of User IT Capabilities and Organized Big Data Analytics on Competitive Advantage
Kamioka, Taro; Hosoya, Ryuichi; Tapanainen, Tommi ULg

in Proceedings of the Pacific-Asian Conference on Information Systems (PACIS) (2017, July 20)

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have ... [more ▼]

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have received attention in many ways, we note that the capability literature has focused more on the IT supply side. We argue that user capabilities have moved to an integral position in firm competitive advantage, and call them “User IT Capabilities” (UIC). A survey was conducted to collect data from Japanese organizations, and a total valid sample of 1,170 respondents involved in big data use was extracted. The findings show the effect of UIC on the performance of big data analytics and firm competitiveness, mediated by the variable of organized big data analytics (OBDA). The direct effects are shown to be valid irrespective of company size, although the levels of UIC and OBDA are higher in larger firms. [less ▲]

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See detailIntraspecific variation of Zn hyperaccumulation in Arabidopsis halleri populations
Schvartzman Echenique, Maria Sol ULg; Corso, Massimiliano; Fataftah, Nazeer ULg et al

Conference (2017, July 19)

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See detailmstR: An R package to generate multistage testing designs
Magis, David ULg; Yan, Duanli; von Davier, Alina

Conference (2017, July 18)

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the ... [more ▼]

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the administered items according to the previous test taker’s responses. However, items are not selected and administered as single units but as modules (subsets). The main goal of MST consists in selecting the optimal path of modules across the successive stages of the test. Unfortunately, if various operational testing programs are nowadays considering MST for practical administrations, there is still very limited access to accurate software that can either treat or generate MST scenarios for research purposes. In this talk we succinctly present a new package from the R software, called mstR (Magis, Yan & von Davier, 2017). Built in the same spirit of the package catR for CAT designs, it permits to generate repeated response patterns under a predefined MST scenario by providing the set of modules and related item parameters, the number of stages and the connections between modules from successive stages. Several rules for optimal module selection and ability estimation (under IRT framework or based on test scores) are also available. This talk will mostly focus on the (non-technical) description of package mstR and its main features. An example will also be described as an illustration of this framework. [less ▲]

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See detailItem purification versus adjustments for multiple comparisons in DIF detection
Drabinova, Adela; Martinkova, Patricia; Magis, David ULg

Poster (2017, July 18)

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See detailDu dessin au design. Seth comme auteur-rééditeur
Crucifix, Benoît ULg

Conference (2017, July 13)

Depuis ces dernières années, l’édition de bande dessinée connaît un véritable boom de rééditions patrimoniales. Dans le contexte nord-américain, ce sont justement les auteurs associés au « roman ... [more ▼]

Depuis ces dernières années, l’édition de bande dessinée connaît un véritable boom de rééditions patrimoniales. Dans le contexte nord-américain, ce sont justement les auteurs associés au « roman graphique » – ceux-là même qui ont exploré le livre en tant qu’objet en réalisant eux-mêmes le design de leurs œuvres – qui sont aussi invités à prendre en charge la conception graphique de ces rééditions d’œuvres du passé qu’ils aident à faire (re)découvrir. Cette communication a pour but d’étudier les designs réalisés par l’auteur canadien Seth pour plusieurs œuvres complètes : The Complete Peanuts, The John Stanley Library et The Collected Doug Wright. Les designs de Seth se caractérisent par leur mise-en-avant d’une esthétique idiosyncratique, comme il l’a lui-même exprimé : « when I design something it really is too much about me » (Spurgeon, 143). Elles se lient donc intimement à la production « propre » de l’auteur. Dans le cas de Stanley et Doug Wright, ces rééditions sont d’ailleurs liées à des essais écrits par Seth, relevant d’un travail autant esthétique qu’historiographique. Il s’agira d’abord de comprendre la spécificité culturelle de cette pratique de réédition dans l’édition « alternative » américaine, qui diffère du contexte éditorial européen ; plus en avant, le cas de Seth permettra de comprendre comment cette pratique ressort d’un mécanisme de canonisation particulier (Heer), mais aussi de montrer à quel point ce type d’objets met en avant une « fonction-auteur » (Foucault) inextricablement liée à une activité historiographique, éditoriale et patrimoniale. [less ▲]

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See detailHighly efficient doped nanocristalline TiO2 for water Treatment
Mahy, Julien ULg; Léonard, Géraldine ULg; Zubiaur, Anthony ULg et al

Conference (2017, July 13)

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See detailUndoing Art
Delville, Michel ULg

Conference (2017, July 13)

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See detailEffect of surface modification of polylactides on fibroblasts L-929 and osteoblasts MG-63
Tilkin, Rémi ULg; Regibeau, Nicolas ULg; Lambert, Stéphanie ULg et al

Conference (2017, July 12)

During the past few years, tissue engineering has become one of the most promising techniques to maintain, improve, or reconstruct human tissue, even complete human organs. This solution is frequently ... [more ▼]

During the past few years, tissue engineering has become one of the most promising techniques to maintain, improve, or reconstruct human tissue, even complete human organs. This solution is frequently based on the realization of temporary porous matrices, also called "scaffolds", design as model and structure for the development of cells. Surface properties of those biomaterials are some determinant criteria for cell adhesion and proliferation. The scope of this work is the study of adhesion and proliferation of fibroblasts L-929 and osteoblasts MG-63 on untreated, hydrolyzed or aminolyzed polylactides. First, these substrates are developed: poly-L,D-lactide (PDLLA) powder is pressed into disks. The surface of disks was chemically modified by hydrolysis and aminolysis surface treatments. Surface modifications were based on previous studies. [1,2] The hydrolysis process is carried out by immersing PDLLA disks in 2 M NaOH for 20 min at room temperature (24°C) under constant agitation. The aminolysis process is performed by placing PDLLA disks in 15 % ethylenediamine in isopropanol for 5 min at room temperature (24°C) under constant agitation. Substrates are characterized by optical microscopy, Scanning Electron Microscopy and water contact angle. Finally, cell adhesion, proliferation, and viability on these substrates are assessed by cell counting and MTT assay after 1, 4, and 8 days of cell culture. Results from surface characterization show an increase of roughness for hydrolyzed polylactide. Regarding water contact angle measurements, values are smaller on treated substrates even though the difference with untreated substrates appears smaller than expected in the literature. [1,2] Cell counting and MTT assay show an increase of cell proliferation and cell viability for treated polylactide substrates in the case of fibroblasts and a decrease of cell proliferation for aminolyzed polylactide substrates in the case of osteoblasts. In conclusions, this work highlights the different effects of surface modification on fibroblasts and osteoblasts viability. References : [1]. Wang YQ, Cai JY. Enhanced cell affinity of poly(L-lactic acid) modified by base hydrolysis: wettability and surface roughness at nanometer scale. Current Applied Physics 2007, 7(S1):e108–e111. [2]. Lin Y, Chrzanowski W, Knowles J, Bishop A, Bismarck A. Functionalized poly(D,L-lactide) for pulmonary epithelial cell culture. Advanced Engineering Materials 2010, 12(4): B101–B112. [less ▲]

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See detailDistributions of urban geometric attributes: a stochastic Muth-Mills approach
Delloye, Justin; Peeters, Dominique; Tharakan, Joseph ULg

Conference (2017, July 12)

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See detailMapping the diachrony of content words: Ancient Greek and Ancient Egyptian as sources for diachronic semantic maps of lexical items
Georgakopoulos, Athanasios ULg; Polis, Stéphane ULg

Conference (2017, July 12)

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected ... [more ▼]

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected the meanings of words in the course of the Ancient Greek and of the Ancient Egyptian language history will be investigated. The semantic map model was initially created in order to describe the polysemic patterns of grammatical morphemes (e.g. Haspelmath, 2003). However, recent studies by François (2008), Perrin (2010), Wälchli and Cysouw (2012), and Georgakopoulos et al. (2016) have drawn attention to the lexical domain, showing that the model can be extended to lexical items. It should be noted that the bulk of research has been adopting a synchronic perspective and the limited research that has added the diachronic dimension, has focused mostly on the grammatical domain (e.g. Narrog, 2010). In this paper, we analyze the diachronic evolution of the polysemy network of lexemes in order to produce ‘dynamicised semantic maps’ (Narrog & van der Auwera, 2011) of lexical items. More specifically, we study concepts from the semantic domains of TIME. The data are extracted from dictio-naries, grammars, and the Perseus digital library (http://www.perseus.tufts.edu/hopper/) for Ancient Greek, and from the Thesaurus Linguae Aegyptiae (http://aaew.bbaw.de/tla/), the Ramses corpus (http://ramses.ulg.ac.be), and etymological dictionaries for Ancient Egyptian. Information on synchronic lexical associations are extracted from CLICS (List et al., 2014), an online database containing tendencies of meaning associations. In CLICS, concepts are represented as nodes in the network and instances of polysemy are visualized as links between the nodes. The diachronic dimension of meaning extension may be added to such a network (Figure 1). On the basis of a diachronic analysis of TIME in Ancient Greek (lexical unit: hṓra), which reveals that the meaning ‘time’ is historically prior to the meaning ‘hour,’ we may add a directed arrow representing directionality of change. However, historical priority is not a sufficient criterion for an arrow to be added. Rather, one should be able to show that meaning extensions have a clear motivation.As such, we suggest identifying the cognitive (e.g. metaphor, metonymy, etc.) and the cultural factors that lie behind the observed evolutions. For example, in the case of the Greek concept TIME, one could establish a metonymic motivation between TIME and HOUR, which arises due to the correlation between the canonical time periods and the time these take to unfold. The present study will provide answers to the question of the directionality of change in two particular languages, namely Ancient Greek and Ancient Egyptian. However, our expectation is that by looking at diachrony in this fashion, significant dimensions of directionality of change with cross-linguistic extensions can be revealed. [less ▲]

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See detailAdvanced oxidative treatment for waste water contaminated by pharmaceutical products
Wolfs, Cédric ULg; Vreuls, Christelle; Gillard, Nathalie et al

Conference (2017, July 12)

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with pharmaceutical products. The aim is to validate a physico-chemical ... [more ▼]

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with pharmaceutical products. The aim is to validate a physico-chemical process that has to be placed downstream a classical biological treatment in existing waste water treatment plants (domestic, industrial or hospital). [less ▲]

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See detailDépolitisation et politisation de la formation des majorités communales en Belgique
Grandjean, Geoffrey ULg

Conference (2017, July 10)

Since 2001, the competences for the organization and election of local authorities in Belgium have been regionalized. The Regions – federated powers – are now competent to take law on these matters. The ... [more ▼]

Since 2001, the competences for the organization and election of local authorities in Belgium have been regionalized. The Regions – federated powers – are now competent to take law on these matters. The three Belgian Regions (Brussels-Capital, Flemish and Walloon) have adopted different law which aims to partially depoliticize the naming of mayors and aldermen. The legal rules constrain the political game concerning the composition of the communal colleges and the colleges of mayors and aldermen. The representatives take into account these legal rules during political negotiations for forming a political majority. The dynamics of governance have therefore significantly changed within the municipalities since 2001 and have diverged between the three Regions. In order to illustrate the depoliticization of the naming process of the communal colleges and the colleges of mayors and aldermen and the reappropriation of legal constraints by the representatives, it is proposed to analyze the formation process of political majorities following the last communal elections in the three Regions. For each Region, two municipalities are chosen because of the specificities that arose during the negotiations, leading to the mobilization of multiple arguments (especially legal arguments) to justify the choice of certain coalition partners. This choice makes it possible to highlight the diverse processes of reappropriation of legal constraints by political actors at the local level. [less ▲]

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See detailThermal treatments for tailoring the microstructure and wear behaviour of friction stir processed Aluminium-C fibres composites
Mertens, Anne ULg; Storti, Marco; Simar, Aude et al

Conference (2017, July 10)

A new and simple method for the production of metal matrix composite by friction stir processing (FSP) sandwiches made from metal sheets (e.g. Mg- or Al-based alloy) intercalated with a reinforcing ... [more ▼]

A new and simple method for the production of metal matrix composite by friction stir processing (FSP) sandwiches made from metal sheets (e.g. Mg- or Al-based alloy) intercalated with a reinforcing material e.g. a carbon fabric has recently been devised by the present authors [A. Mertens et al., Mater. Charact. 107 (2015), 125-133]. This process allowed the production of large-size sound metal matrix composites, but the usage properties (e.g. wear resistance,...) of these composites are not yet optimised. Indeed, the matrix of the composite may be softened after processing as FSP is known to cause dissolution of the precipitates responsible for strengthening Mg- or Al-based alloys [A. Simar et al., Mater. Sci. Eng. A 486 (2008), 85-95]. This work thus aims at investigating the potential of thermal treatments for tailoring the microstructure and wear behaviour of age hardenable aluminium alloy 6005 – C fibres composites. The effect of (solution and) ageing treatments on the microstructure and hardness of FSPed Al-C composites has been investigated using optical and scanning electron microscopy, along with Vickers hardness tests. The wear behaviour of the as-FSPed and of the heat treated specimens has been characterized using a pin-on-disc tribometer. Moreover, reference AA6005 samples without C fibres have been produced and tested under similar conditions. The comparison of the reference and of the composite samples allows a better understanding of the role of the C fibres in controlling the grain size of the Al matrix by influencing recrystallisation during FSP and grain growth during thermal treatments. [less ▲]

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See detailDetermining fine population structure using iterative pruning
Chaichoompu, Kridsadakorn ULg; Yazew, Fentaw Abegaz; Tongsima, Sissades et al

Poster (2017, July 10)

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an ... [more ▼]

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an unsupervised clustering algorithm called the iterative pruning method to capture population structure (IPCAPS). Our method supports ordinal data which can be applied directly to SNP data to identify fine-level population structure and it is built on the iterative pruning Principal Component Analysis (ipPCA) algorithm (Intarapanich et al. 2009). The IPCAPS involves an iterative process using multiple splits based on multivariate Gaussian mixture modeling of principal components and Clustering EM estimation as in Lebret et al. (2015). In each iteration, rough clusters and outliers are also identified using our own method called RubikClust. The fixation index (FST) is known to measure a distance between populations and FST = 0.001 may be said to be genetically distinct among the European populations (Tian et al. 2008, Huckins et al. 2014). To observe fine-level population structure using FST, we examined simulated scenarios of one population, 500-8,000 individuals, 5,000-10,000 independent SNPs in HWE (Balding and Nichols 1995), with 100 replicates for each scenario. The simulated SNPs were encoded as additive coding and there was no missing genotype generated. We introduced negative control by subjecting individuals to be separated into two groups using kmeans. We observed that FST values of divided groups were lower than 0.0008, which can be defined as the minimum FST to detect fine-level population structure. To evaluate the performance of our method, we tested different simulated data sets of 2-3 populations, 250 individuals per population, 10,000 independent SNPs in HWE, and FST=[0.0008,0.005], with 100 replicates for each data set. For real-life data sets, we applied the IPCAPS to Thai (Wangkumhang et al. 2013) and HapMap populations. Our method showed that a population classification accuracy was superior to the ipPCA in simulated scenarios of extremely subtle structure (FST=[0.0009,0.005]). In case of the Thai population, results to detect fine-level structure were obtained as well as in case of the HapMap populations. We are convinced that the IPCAPS has a potential to detect fine-level structure and it will be important in molecular reclassification studies of patients once underlying population structure has been removed. [less ▲]

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See detailDimensions adaptatives des fonctionnements pervers et psychopathiques : une approche étho-phénoménologique
Englebert, Jérôme ULg

Conference (2017, July 10)

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique ... [more ▼]

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique clinique suggère de conserver ces deux entités présentant une finesse psychopathologique plus grande et un pouvoir discriminatif plus important que la personnalité antisociale. Nous souhaitons interroger les dimensions intrinsèquement adaptatives de ces deux entités, mais aussi relever leurs différences sur le continuum de l’adaptation. Nous chercherons, en effet, à démontrer que le principe d'adaptation est une dimension centrale et commune aux deux entités, mais qui « se joue » de façons différentes pour chacune. Le pervers est hyper-adapté à son interlocuteur tout en présentant des moments paradoxaux d'inadaptation. Le psychopathe, avec sa faculté de chosification de l'alter ego et ses compétences émotionnelles paradoxales, présente une adaptation plus solitaire. Dans une perspective inspirée des paradigmes éthologique et phénoménologique, nous tenterons de cerner les différences essentielles entre ces deux modes d’être-au-monde. [less ▲]

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See detailTrematominae and Artedidraconinae: contrasted mitogenome evolution for two Antarctic radiations
Dettai, Agnes; Auvinet, Juliette; Frederich, Bruno ULg et al

Conference (2017, July 10)

Cellular respiration has been widely studied in Antarctic teleost fishes because of their peculiar adaptations to an extreme environment. In parallel mitochondrial sequence markers have become highly ... [more ▼]

Cellular respiration has been widely studied in Antarctic teleost fishes because of their peculiar adaptations to an extreme environment. In parallel mitochondrial sequence markers have become highly popular for molecular systematics. However, there are few whole mitochondrial genome sequences published, and none available for some of the subfamilies. Here, we present two large mitogenome datasets including most species and multiple sequences for many species of two subfamilies, Trematominae and Artedidraconinae (Duhamel et al. 2014). These include two highly diverse but very different adaptative radiations, with contrasting divergence dates, morphological polymorphism, and habitat dominance. The sampling is based on a well identified, extensive collection resulting from the 2008 CEAMARC survey and the subsequent REVOLTA surveys in Terre Adélie (IPEV), already DNA barcoded and sequenced in previous studies. The mitogenome sequences for these two subfamilies differ in composition, gene order, and relative divergence of mitochondrial markers, with strong, taxon-specific biases like very high C contents in some regions. The gene order change provides a synapomorphy for the subfamily Trematominae and an interesting development in teleost mitogenomes. The complete Artedidraconinae mitogenomes provide a much higher amount of variable sites (approx*30), while previous sequence datasets were plagued by low informativeness (Lecointre et al. 2011). As already established on single mitochondrial genes, intraspecific variability is lower than interspecific variability within each subfamily, however interspecific variability in Artedidraconinae is lower or similar to intraspecific variability in Trematominae. This expanded dataset confirms the unusual evolution of the mitochondrial coded sequences involved in the cellular respiration in Antarctic Nototheniidae, as well as the usefulness of complete mitochondrial genomes for their systematics. The two level multiplexing (Timmermans et al. 2010) and next generation sequencing of long PCR amplicons (following Hinsinger et al. 2015) is efficient to obtain large mitogenomic datasets representative of both inter- and intraspecific variability, key to the understanding of mitochondrial evolution and a step closer to resolving the relationships among these taxa. [less ▲]

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See detailIncreased sea ice cover disrupts food web structure in Antarctic coastal benthic ecosystem
Michel, Loïc ULg; Danis, Bruno; Dubois, Philippe et al

Conference (2017, July 10)

Antarctica currently undergoes strong and contrasted impacts linked to climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice ... [more ▼]

Antarctica currently undergoes strong and contrasted impacts linked to climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase. Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using time-tested integrative trophic markers (stable isotope ratios of carbon, nitrogen and sulfur) and state-of-the-art data analysis tools (Bayesian ecological models), we studied the structure of the food web associated to benthic macroinvertebrates communities. In total, 28 taxa spanning most present animal groups (sponges, sea anemones, nemerteans, nematods, sipunculids, sessile and mobile polychaetes, gastropods, bivalves, pycnogonids, crustaceans, sea stars, sea urchins, brittle stars and sea cucumbers) and functional guilds (grazers, deposit feeders, filter feeders, predators, scavengers) were investigated. Our results indicate that the absence of seasonal sea ice breakup deeply influences coastal benthic food webs. We recorded marked differences from literature data, both in terms of horizontal (i.e. primary producers and resources supporting animal populations) and vertical (i.e. trophic level of the studied consumers) structure of the food web. Overall, sympagic algae dominated the diet of many key consumers, and the trophic levels of invertebrates were low, suggesting omnivore consumers relied less on predation and/or scavenging than in normal environmental conditions. Surprisingly, few animals seemed to feed on the extremely abundant benthic biofilm, whose exceptional development was also presumably linked with the peculiar sea ice conditions. Comparison of data obtained in the austral summers of 2013-2014 (first year without seasonal breakup) and 2014-2015 (second year without seasonal breakup) clearly showed that the observed trends were linked to actual temporal changes in invertebrate feeding habits rather than with other potential ecological drivers. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden changes in environmental conditions and trophic resource availability. They also show that local and/or global trends of sea ice increase in Antarctica have the potential to cause drastic changes in food web structure and therefore impact benthic communities. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO project (http://www.versoproject.be). [less ▲]

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See detailEvaluating flexibility and adequacy in future EU power systems: model coupling and long-term forecasting
Quoilin, Sylvain ULg; Nijs, Wouter; Zucker, Andreas

in Proceedings of the 2017 ECOS Conference (2017, July 09)

There is an increasing need for improving the representation of the power system in energy system models. Recent research has shown that the economic value of each MWh of Variable Renewable Energy (VRE ... [more ▼]

There is an increasing need for improving the representation of the power system in energy system models. Recent research has shown that the economic value of each MWh of Variable Renewable Energy (VRE) declines with growing deployment. There are two main reasons for this: (1) even with limited shares of VRE, there is a reduced utilisation of dispatchable power plants and (2) with high shares of VRE, there can be possible excess electricity that might have to be curtailed in case of insufficient storage capacity. These findings tend to be completely ignored by models with low temporal resolution and high shares of VRE. In this work, we aim at endogenizing the flexibility constraints into long-term planning models (such as the JRC-EU-TIMES model) by taking profit of Dispa-SET, a unit commitment and optimal dispatch model. The main idea is to derive generic functions from Dispa-SET that can be used by JRC-EU-TIMES and all other energy system models. In particular, we evaluate the impact of increased variable renewable power and different configurations of power systems (production, storage, EVs, demand and flexible demand) (1) on the operations of power plants and the different storage options, determining their economics such as operating hours, number of cycles and (2) on the amount of possible excess power (power that has to be curtailed, stored, or transformed. Simulations are run in Dispa-SET for a wide set of exploratory configurations of the power system in Dispa-SET. Then, a statistical analysis of the results is performed to derive generic flexibility functions. An example of the use of such flexiblity function is finally proposed for a long-term simulation in the JRC-EU-TIMES model at the European level, showing a non-negligible impact on the value of VRE, on the utilization of dispatchable generation, and on the required storage capacity. [less ▲]

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See detailTraducción y retraducción al francés de Conversación en La Catedral
Belleflamme, Clémence ULg

Conference (2017, July 09)

La ponencia se inscribe en el marco más amplio de una investigación de doctorado dedicada a la retraducción al francés de obras literarias hispanoamericanas de la segunda mitad del siglo XX. Además de una ... [more ▼]

La ponencia se inscribe en el marco más amplio de una investigación de doctorado dedicada a la retraducción al francés de obras literarias hispanoamericanas de la segunda mitad del siglo XX. Además de una parte teórica, dedicada a la noción traductológica de retraducción, la tesis constará de un estudio de casos, los de Pedro Páramo, de Juan Rulfo, y de Conversación en La Catedral, de Mario Vargas Llosa. Ambas novelas se tradujeron por primera vez al francés unos años después de su publicación y por segunda vez a principios del siglo XXI. Se investigarán tanto las estrategias editoriales como las estrategias de traducción, que un análisis textual de índole descriptivo debería permitirme deducir de manera inductiva a partir de las diferencias lingüísticas y pragmáticas que existen entre las distintas versiones. En esta ponencia, presento los primeros resultados del análisis textual comparativo de las versiones en francés de Conversación en La Catedral y formulo las primeras hipótesis en cuanto a los motivos para retraducir. [less ▲]

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See detailEffects of a giant exercising board game intervention on ambulatory physical activity among nursing home residents: a preliminary study
Mouton, Alexandre ULg; Gillet, Nicolas; Mouton, Flore et al

Conference (2017, July 08)

Purpose: This study examined the effects of a giant (4 meters by 3 meters) exercising board game intervention on ambulatory physical activity (PA) and on a broader array of physical and psychological ... [more ▼]

Purpose: This study examined the effects of a giant (4 meters by 3 meters) exercising board game intervention on ambulatory physical activity (PA) and on a broader array of physical and psychological outcomes among nursing home residents. Materials and methods: A quasi-experimental longitudinal study was carried out in two comparable nursing homes. Ten participants (aged 82.5 ± 6.3 and comprising 6 women) meeting the inclusion criteria took part to the one-month intervention in one nursing home, whereas eleven participants (aged 89.9 ± 3.1 with 8 women) were assigned to the control group in the other nursing home. The giant exercising board game required participants to perform strength, flexibility, balance and endurance activities. The assistance provided by an exercising specialist decreased gradually during the intervention in an autonomy-oriented approach, based on the self-determination theory (SDT). The following were assessed at baseline, after the intervention and after a follow-up period of three months: PA (steps/day and energy expenditure/day with ActiGraph, GT3X+), cognitive status (MMSE), quality of life (EQ-5D), motivation for PA (BREQ-2), gait and balance (Tinetti and SPPB), functional mobility (Timed Up and Go) and the muscular isometric strength of the lower limb muscles. Results and conclusions: In the intervention group, PA increased from 2921 steps/day at baseline to 3358 steps/day after the intervention (+14.9%, p = 0.04) and 4083 steps/day (+39.8%, p = 0.03) after three months. Energy expenditure/day also increased after the intervention (+110 kcal/day, +6.3%, p = 0.01) and after three months (+219 kcal/day, +12.3%, p = 0.02). Quality of life (p < 0.05), balance and gait (p < 0.05), and strength of the ankle (p < 0.05) were also improved after three months. Such improvements were not observed in the control group. The preliminary results are promising but further investigation is required to confirm and evaluate the longterm effectiveness of PA interventions in nursing homes [less ▲]

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See detailMémoire et "ouverture" : une analyse de la métaphore (spatiale et chirurgicale) dans Les taupes de Félix Bruzzone
Licata, Nicolas ULg

Conference (2017, July 08)

À l’inverse d’Aristote, qui l’envisage comme un procédé rhétorique, Nietzsche fait de la métaphore un concept opératoire : une activité instinctive permettant d’accéder à l’essence des choses. Mais ... [more ▼]

À l’inverse d’Aristote, qui l’envisage comme un procédé rhétorique, Nietzsche fait de la métaphore un concept opératoire : une activité instinctive permettant d’accéder à l’essence des choses. Mais l’essence intime des choses, bien qu’indépendante de la métaphore en tant que moyen d’expression, se trouve en elle « comme le père par rapport à son fils », formule le philosophe allemand. Autrement dit, pour autant de fils, c’est-à-dire, de métaphores, que l’on possède, on ne dispose jamais que de dérivés de la chose, pas de la chose elle-même. D’où la nécessité de diversifier les métaphores pour tendre vers une perspective plus ample, plus compréhensive sur la chose. C’est d’ailleurs ce que fait Nietzsche lui-même dans ses essais. C’est aussi, il nous semble, ce que ferait Félix Bruzzone dans le roman ici considéré. Paru en 2008, Les taupes s’inscrit dans la tendance de la literatura de los hijos, ou « littérature des enfants » (sous-entendu, enfants de la dictature). Les caractéristiques qui distinguent ce roman des récits de mémoire traditionnels sont sa discontinuité et son imprévisibilité, ainsi que son langage métaphorique. Errance, voyage, maisons vides et tempêtes, travestisme, chirurgie, le livre contient diverses métaphores, métaphores au sens nietzschéen, large. Certaines d’entre elles sont décodables — on les appelle métaphores in presentia, car on en possède à la fois le « véhicule » et la « teneur » — ; d’autres demeurent absolument indéchiffrables — on nomme celles-là in absentia, car leur « teneur » fait défaut —. Un exemple de métaphore in presentia est le périple qu’effectue le protagoniste vers le sud. Descendre à Bariloche, c’est remonter dans un passé dont on ne peut, semble-t-il, s’extirper. D’un autre côté, on trouve un exemple éclatant de métaphore in absentia dans l’implant mammaire que subit ce même protagoniste dans les dernières pages du roman. Félix Bruzzone nous livre le véhicule de la métaphore mais garde pour lui sa teneur, et entre les deux, les possibilités sont presque infinies. La multiplication des métaphores dans Les taupes et, plus précisément encore, la présence d’une métaphore in absentia, mènent à s’interroger sur le procédé lui-même. Il est surprenant qu’à partir d’un matériau autobiographique Bruzzone produise un récit inachevé et codé. De fait les récits qui prennent pour sujet la dictature adoptent majoritairement la forme réaliste du témoignage. Mais le problème de ces récits est qu’ils reproduisent l’unicité du point de vue dictatorial qu’ils dénoncent. C’est ici que la définition nietzschéenne de la métaphore peut nous illuminer. Bruzzone, en diversifiant les métaphores, propose pour sa part un récit aux multiples points de vue : un roman « ouvert », au sens de collaboration théorique qu’Umberto Eco attribue à ce terme. Et quelle meilleure façon d’éviter le piège d’opposer à la dictature un autre point de vue unique, après tout, que d’inviter le lecteur à s’impliquer mentalement dans la réflexion à son sujet ? [less ▲]

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See detailHercules in the Art of Renaissance Flemish Tapestry
Laruelle, Anne-Sophie ULg

Conference (2017, July 08)

The exploits of Hercules, one of the most popular literary and artistic themes of the Renaissance, flourished particularly in tapestries, a major artistic genre of this period. Fine tapestries presenting ... [more ▼]

The exploits of Hercules, one of the most popular literary and artistic themes of the Renaissance, flourished particularly in tapestries, a major artistic genre of this period. Fine tapestries presenting this theme were produced by the best weaving workshops of the former Netherlands. The success of the theme in tapestry invites us to ponder on the special meaning given to it by the princes, the privileged recipients of these tapestries. There is no doubt that, more than any other hero, Hercules served as their model as he embodied the virtus heroica. We will delve deeper in the matter by focusing on the period between the middle of the fifteenth century (when the theme first appears in tapestries) and the 1560s. In addition to the exceptional quantity of preserved tapestries (over a 100!), the numerous references to the Herculean theme in ancient inventories and descriptions confirms its importance at the time and reveals the complexity of its iconography. [less ▲]

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See detailAdvanced oxidative treatment for waste water contamined by pharmaceutical products
Belet, Artium ULg; Vreul, Christelle; Gillard, Nathalie et al

Conference (2017, July 07)

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with Pharmaceutical Products (PPs). The aim is to validate a physico ... [more ▼]

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with Pharmaceutical Products (PPs). The aim is to validate a physico-chemical process combining ozonation and photocatalysis and that has to be placed downstream a classical biological treatment in existing waste water treatment plants (WWTP - domestic, industrial or hospital). [less ▲]

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See detailLes formes de structuration de l'espace "stade" par le croisement des discours du football et de la publicité
Bassilua Nzuzi, Anicet ULg

Conference (2017, July 07)

Le croisement du football avec la publicité semble structurer l’espace stade en plusieurs dimensions. Deux critères sont ainsi repérés : une structuration verticale et une structuration horizontale. La ... [more ▼]

Le croisement du football avec la publicité semble structurer l’espace stade en plusieurs dimensions. Deux critères sont ainsi repérés : une structuration verticale et une structuration horizontale. La structuration verticale s’opère par exemple dans les stades construits sur plusieurs niveaux. On observe que l’installation des panneaux publicitaires y suit un ordre de grandeur croissant partant de bas vers le haut, divisant le stade en plusieurs espace-unités à valeur inégales (le rez-de-chaussée, le premier niveau, le deuxième niveau, etc.). La structuration horizontale est réalisée à partir, par exemple, des effets de distance que créent la situation du spectateur et la zone d’exposition du panneau publicitaire : le spectateur situé à un certain endroit (le rez-de-chaussée, par exemple) est parfois invité à exécuter certains mouvements (le plus souvent latéraux : regards à l’angle du profil en suivant le déplacement du ballon). Ce faisant, il découvre des panneaux publicitaires par un rythme hiérarchique et discriminatoire : certains panneaux sont bien découverts ; d’autres, il ne les découvre que très peu ; d’autres encore ils ne les découvrent pas du tout. (Un spectateur situé au rez-de-chaussée à la hauteur de la ligne médiane du terrain du côté de la tribune de presse et qui regarde le match, peut découvrir des panneaux publicitaires situés en face de lui lorsqu’il suit, par exemple, des séquences de passe qui se déroulent le long de la ligne de touche opposée: regard de face ; il découvre des panneaux placés derrières les buts lorsqu’il regarde un but qui s’exécute : regard de profil ; il ne voit pas du tout les panneaux situés en contrebas de son siège, par exemple les panneaux derrières les bancs des staffs techniques des équipes). Les espaces-unités construits par ces deux types de structuration deviennent en réalité des lieux d’attribution des compétences modales des sujets (pouvoir faire, devoir faire, vouloir faire, savoir faire), les spectateurs en l’occurrence, qui sont les cibles de la communication publicitaire. Cette attribution se réalise en fonction de quatre régimes de distribution modale des panneaux : régime d’exposition, régime d’accessibilité, régime d’inaccessibilité et régime d’obstruction. Il s’instaure ainsi tout un système de hiérarchisation du public qui vient assister à un match de football au stade, lequel se réalise notamment en fonction de leurs différents degrés d’exposition aux messages publicitaires et qui, par ailleurs, sont parfois rendus possible par la dimension narrative du jeu (l’exécution des séquences : but, passe, remise en jeu, remise de touche, etc.). Plusieurs cas de ce système de hiérarchisation adviennent au cours d’un match. Par exemple, lorsque la diffusion des messages publicitaires tient compte du type de public sollicité pour le découvrir. C’est le cas de la discrimination des messages qu’opèrent les annonceurs lorsqu’ils peuvent choisir d’orienter certains messages vers un public spécifique, celui installé dans la tribune d’honneur par exemple, à l’exclusion d’autres. Notre étude explore cette structuration de l’espace qu’opère au stade le croisement du football et la publicité, en recourant aux outils de sémiotique. Nous considérons entre autres le football et la publicité comme deux discours présentant des schémas énonciatifs et argumentatifs différents : celui fondé sur une logique de l’épreuve engagée entre deux équipes en situation ludique, pour le football, et celui basé sur une logique communicationnelle fondé sur un schéma argumentatif de type persuasif, pour la publicité. [less ▲]

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See detailHealth and physical education from a European perspective
Cloes, Marc ULg

Conference (2017, July 07)

At the end of the 20th century, several authors pointed out that physical education (PE) was crossing a crisis. The emphasis on the fight against a growing sedentariness of the society became ... [more ▼]

At the end of the 20th century, several authors pointed out that physical education (PE) was crossing a crisis. The emphasis on the fight against a growing sedentariness of the society became progressively one of the priorities of the national education leaders all around the world. In many countries, PE teachers had to implement new approaches in order to teach to the youth how to adopt a healthy lifestyle. Pre- and in-service PE teachers’ training started to propose programmes integrating health education in PE lessons while the reputation of the physical literacy concept spread quickly. Recently, Chin and Edginton (2014) invited scholars from 40 nationalities to describe the contemporary policies and practices of health and PE applied in their countries. Among those contributions, 23 concerned European countries. In this presentation, we will propose an overview of the trends that can be identified in this sample of European nations. Preliminary analysis underlines that combination of PE and health education is distributed along a continuum. At one extremity, PE’s input on health is not clearly expressed even if PE is expected to improve pupils and students’ health through selected activities like endurance training. At the opposite extremity, countries emphasize the role of the PE teacher as a health educator and not only through a limited focus on PA promotion and on the preparation of physically educated citizens. The second part of the paper will illustrate some actions that are undertaken in order to motivate the PE teachers to implement 'health enhanced physical activity' projects in their lessons. Such approaches respect principles associated with the concept of quality physical education (QPE). These PE classes should allow students to have positive individual and collective learning experiences where they develop knowledge, skills and dispositions that allow them to be autonomous and responsible decision makers relative to engagement in PA and sport in their lives (AIESEP, 2014). PE teachers need a new framework (Haerens et al., 2011) in order to leave their ingrained professional practices.. That starts by changing their representations on physical activity. Action-research, development of communities of practice, pedagogical cases and demonstration of the students’ interest for teaching approaches focusing on lifestyle aspects represent promising strategies to succeed in the process of changing the priorities. AIESEP (2014). 2014 AIESEP Position Statement on Physical Education Teacher Education. Available on Internet: http://aiesep.org/wp-content/uploads/2014/11/2014-AIESEP-Position-Statement-on-Physical-Education-Teacher-Education.pdf Chin, M.-K. & Edginton, C.R. (2014). Physical Education and Health Global Perspectives and Best Practice. Urbana, IL: Sagamore. Haerens, L., Kirk, D., Cardon, G., & De Bourdeaudhuij, I. (2011). Toward the Development of a Pedagogical Model for Health-Based Physical Education, Quest, 63:3, 321-338. [less ▲]

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See detailEVOLUTION OF SLUDGE INTERNAL STRUCTURE DURING DRYING: EFFECT OF THE CONDITIONING CONDITIONS
Fraikin, Laurent ULg; Pambou, Yvon-Bert; Salmon, Thierry ULg et al

Conference (2017, July 07)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimited by an external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

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See detailConstructing and performing the category of "rare disease": Multi-sited ethnography within some patients and relatives' organizations in Belgium
Duysens, Fanny ULg

Conference (2017, July 07)

"Rare diseases" affect less than one person in 2000 in the European Union. In addition to this low prevalence rate, they are defined as being generally the object of insufficient knowledge and recognition ... [more ▼]

"Rare diseases" affect less than one person in 2000 in the European Union. In addition to this low prevalence rate, they are defined as being generally the object of insufficient knowledge and recognition, which often leads patients and their relatives to situations of diagnostic and therapeutic wandering. Then, many gather in some "rare diseases organizations" that aim at guiding concerned people in their health- and disease-related itineraries and at improving their quality of life. Drawing on a multi-sited ethnography conducted in Belgium, this communication presented some insights of the categorization work (Bowker & Star, 2000) operated by the "Rare Disease Organization" in Belgium in order to construct, consolidate, and expand a univocal category of "rare diseases". It particularly highlighted the mobilization of patients and relatives' narratives of lived experiences and common problematics as collective resources to categorize "rare diseases". Doing this, the organization tends to encompass the multiplicity and the variety of corresponding diseases, situations, experiences, and conceptions of patients and their relatives, in the aim of forming "a single front" and speaking from "a single voice" to publicized and make their claims heard. Moreover, the communication interrogated the articulation between the singularity of patients and relatives' narratives and the collective logic that they reflect (Douglas, 1986). How are rare diseases-related experiences exchanged within patients and relatives' organizations? How do they align with each other to transform them into collective resources to categorize "rare diseases"? What are the elements that make sense and what, conversely, is lost in this passage from the singularity to the collective? Moreover, what are the relationships between the narratives of patients and relatives and the wider social, political and medical contexts in which they are embedded? As a precision, this ongoing doctoral research fits into Science and Technology Studies, Anthropology of health and disease, and Sociology of knowledge. [less ▲]

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See detailEmergence d’une Politique de la Ville en Wallonie en regard de la vision européenne
Mercenier, Chloé ULg; Bianchet, Bruno ULg; Ruelle, Christine ULg et al

Conference (2017, July 06)

The aim of our presentation is to present some issues for Wallonia regarding to the urban strategy of European Union (European Council of Ministers and European Commission). We present these two ... [more ▼]

The aim of our presentation is to present some issues for Wallonia regarding to the urban strategy of European Union (European Council of Ministers and European Commission). We present these two strategies: the European (Urban Agenda/Pact of Amsterdam) and the Walloon strategies. We focus our communication on two regional specific issues: cooperation between municipalities ("supracommunalité") and the rehabilitation of residential and economic functions of urban neighbourhoods. [less ▲]

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See detailD'un choc culturel à une conscience linguistique. Un cas d'apprentissage du japonais par le public francophone
Goto, Kanako ULg

Conference (2017, July 06)

Comme J. Arnold et différents spécialistes l’attestent, le facteur émotionnel favorise l’environnement de l’apprentissage. L’on apprend plus vite, plus intensément et plus profondément. Alors, lorsqu’ un ... [more ▼]

Comme J. Arnold et différents spécialistes l’attestent, le facteur émotionnel favorise l’environnement de l’apprentissage. L’on apprend plus vite, plus intensément et plus profondément. Alors, lorsqu’ un apprenant francophone – qui vit avec une conception du monde occidentale (notamment à la française) - rencontre une langue « lointaine », celle de l’autre civilisation, à savoir une langue qui réfléchit à la verticale, qui ne précise pas le sujet, qui est à la fois laconique et équivoque…bref, celle qui se trouve à l’opposé de l’horizon cartésien, quel genre d’alchimie se produirait ? Et quel est le rôle de l’enseignant dans tout cela ? Dans cet exposé, des réflexions issues de l’expérience de l’enseignement du japonais pour le public francophone de ces 5 dernières années seront passées en revue. La rencontre entre ces deux langues, très différentes, ne pourra point se faire sans provoquer de « choc » culturel. Et ce choc même, semble-t-il, constituerait l’élément décisif qui favorise l’environnement de l’apprentissage du japonais, la langue souvent qualifiée d’être très éloignée du français par son côté ambigu, obscur et qui cherche l’harmonie plutôt que la distinction. Parmi les différents facteurs qui influenceront l’impact émotionnel dans l’apprentissage du japonais par les Francophones, le choix adéquat de matières (corpora) sera particulièrement mis en avant. Quelques corpora propres à la langue japonaise (ex : onomatopées, façons de dire « non » à la japonaise, dictons) semblent être pertinents afin d’éveiller la curiosité de l’apprenant. Et ce déclic générerait l’intérêt chez ce dernier, ce qui l’incite à travailler consciencieusement cette nouvelle langue. Notre exposé aspire également à suggérer que cette prise de conscience linguistique – acquise grâce à l’apprentissage d’une langue étrangère – amènerait l’apprenant à réfléchir sur des caractéristiques de sa langue maternelle et de son fonctionnement, ancrés dans une culture et une société définies. [less ▲]

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See detailSTUDY OF ACTIVATED SLUDGE DEWATERING : USING BIOBASED COAGULANTS
Fraikin, Laurent ULg; Clermont, Quentin; Salmon, Thierry ULg et al

Poster (2017, July 06)

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those ... [more ▼]

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those obtained with a sole classical coagulant. For this work, a standard compression-expression cell is used and an experimental design is develop to highlight the effect of the biobased coagulants. [less ▲]

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See detailDéveloppement régional au départ des pôles extérieurs : typologie, enjeux et ressources territoriales en Wallonie
Wilmotte, Pierre-François ULg; Bianchet, Bruno ULg

Conference (2017, July 06)

The aim of our paper is to present how an European region can insert its region in some cross-border (potential) metropolitan and polycentric areas. Wallonia is interesting to understand a case where no ... [more ▼]

The aim of our paper is to present how an European region can insert its region in some cross-border (potential) metropolitan and polycentric areas. Wallonia is interesting to understand a case where no metropolitan centres are located in the region. The objective is to indicate how territorial resources are influenced by these foreign cities and the original combination of territorial resources in order to emerge a typology for the European regions. [less ▲]

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See detailVers une politique de la ville en Wallonie (Belgique) : évolution socio-économique des villes wallonnes et recommandations
Claeys, Dorian ULg; Descamps, Julien; Wilmotte, Pierre-François ULg et al

Conference (2017, July 06)

The aim of the presentation is to present the recent trajectories of the urban neighbourhoods of 12 Walloon cities. The objective is to connect these evolutions with the urban development and policies of ... [more ▼]

The aim of the presentation is to present the recent trajectories of the urban neighbourhoods of 12 Walloon cities. The objective is to connect these evolutions with the urban development and policies of Walloon cities. [less ▲]

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See detailUn dispositif de formation initiale des enseignants en didactique des mathématiques au niveau du secondaire supérieur en Belgique francophone
Balhan, Kevin ULg; Gérard, Isaline; Nguyen, Giang et al

Conference (2017, July 05)

L'article présenté lors du symposium fédère plusieurs recherches menées dans notre laboratoire de didactique des mathématiques : le « Ladimath », autour de la formation initiale des enseignants de ... [more ▼]

L'article présenté lors du symposium fédère plusieurs recherches menées dans notre laboratoire de didactique des mathématiques : le « Ladimath », autour de la formation initiale des enseignants de mathématique au niveau du lycée et, plus particulièrement, autour d’une question de recherche qui concerne une dimension particulière de la « réflexivité » : « les mathématiques comme problème professionnel ». Nous y décrivons le dispositif mis en place dans la formation initiale des enseignants en mathématique à l’Université de Liège, celui-ci étant alimenté de différentes manières selon l’épistémologie du savoir mathématique questionné lors de la formation. Dans cet article, nous l’illustrons sur trois thèmes différents : celui de l’analyse mathématique, de la géométrie, et des probabilités/statistiques. [less ▲]

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See detailConditions, apports et limites du e-tutorat dans un dispositif de formation hybride
Denis, Brigitte ULg

in Rinaudo, Jean-Luc (Ed.) Symposium du REF - Téléprésence en éducation (2017, July 04)

Un des enjeux de la formation à distance en formation d’adultes est de mettre en place des dispositifs répondant aux besoins des apprenants, respectant des principes andragogiques et procurant un ... [more ▼]

Un des enjeux de la formation à distance en formation d’adultes est de mettre en place des dispositifs répondant aux besoins des apprenants, respectant des principes andragogiques et procurant un environnement de qualité pédagogique (activités, ressources...) et ergonomique. De plus, le tutorat est un facteur primordial dans la mise en œuvre de tels dispositifs. Procurant un sentiment de présence (Jacquinot, 2002), fournissant un soutien (socio-affectif, cognitif, organisationnel...) à l’apprenant, il influence sa persévérance et l’atteinte de ses objectifs. Cette étude traite de la médiation entre e-tuteurs et apprenants dans un dispositif de formation hybride (certificat d'université en gestion de dispositifs techno-pédagogiques innovants). La mise en place de ce dernier a impliqué d’une part un processus d’ingénierie pédagogique incluant une médiatisation des savoirs (ressources) et des activités à distance (consignes, outils de communication, de dépôt de travaux, etc.) et, d’autre part, un processus d’ingénierie tutorale (Rodet, 2010). Les e-tuteurs ont été formés (Denis, 2003) et se sont accordés sur leur profil d’interventions vis-à-vis des apprenants. En outre, des réunions de concertation ont été organisées à plusieurs reprises durant la formation afin de réguler, au besoin, les interventions tutorales. Le principe de ce dispositif est de s’ancrer dans le projet personnel du participant. Il prévoit au fil de la formation des interactions régulières entre un e-tuteur et son (ses) tutoré(s) sur base d’un carnet de route (Roadbook) hebdomadaire complété en ligne. Ces interactions ont généralement lieu par courriel ou via l’annotation de documents partagés. Par ailleurs, les tutorés reçoivent également de la part des formateurs des feedback écrits personnalisés au fur et à mesure de la rentrée de leurs travaux. Ces derniers, ainsi que leurs réflexions tout au long du processus de formation, sont compilés dans leur Roadbook. Les conditions, apports et limites du e-tutorat dans ce dispositif seront appréhendées à partir de l’analyse des Roadbooks des apprenants et d’interviews de l’un d’entre eux ainsi que des e-tuteurs. [less ▲]

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See detailUsing amino acid stable isotopes to estimate trophic position
Sturaro, Nicolas ULg

Conference (2017, July 04)

Estimating the trophic positions of animals in food webs is useful in addressing many fundamental ecological and ecotoxicological questions. These estimates are generally based on gut content and stable ... [more ▼]

Estimating the trophic positions of animals in food webs is useful in addressing many fundamental ecological and ecotoxicological questions. These estimates are generally based on gut content and stable isotope analyses, which have become essential tools for ecotoxicologists. While these tools have proven their usefulness, they involve several pitfalls that can result in large errors in the estimation of animals’ trophic positions. Relatively recently, these tools were improved with the analysis of the compound-specific amino acid nitrogen stable isotopes. The approach is based on the fact that certain amino acids (e.g., glutamic acid) exhibit metabolic isotope fractionation and others (e.g., phenylalanine) are incorporated into the tissues of consumers in a conservative manner. Indeed, amino acids of the latter category exhibit only a small change in their nitrogen isotope composition, which is similar to that found in primary producers. Therefore, the trophic position of an animal species is estimated based on a comparison of the nitrogen isotope composition of these two groups of amino acids from a single organism. This lecture will try to show the potential of the compound-specific stable isotope analysis of amino acids to illustrate food-web structure and estimate trophic positions in wild animal populations. It will summarize recent advances from field and laboratory studies and present case studies taken from the aquatic environment. In addition, this lecture will discuss the benefits, current limitations and analytical challenges related to this approach, which continues to open new research routes in many fields of ecology, including ecotoxicology. [less ▲]

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See detailFor your ka! How to give something as a present to the tomb owner?
Motte, Aurore ULg

Conference (2017, July 04)

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See detailUnsteady pressure distributions on a 4:1 rectangular cylinder: comparison of numerical and experimental results using decomposition methods.
Guissart, Amandine ULg; Andrianne, Thomas ULg; Dimitriadis, Grigorios ULg et al

Conference (2017, July 04)

Detached flows around bluff bodies are ubiquitous in civil engineering applications. In this work, the flow around a static 4:1 rectangular cylinder at moderate Reynolds number and at different angles of ... [more ▼]

Detached flows around bluff bodies are ubiquitous in civil engineering applications. In this work, the flow around a static 4:1 rectangular cylinder at moderate Reynolds number and at different angles of incidence is studied using both Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD). Typically, the integration of EFD and CFD allows a better understanding of the flow of interest by leveraging the complementary of their respective outputs. However, the comparison of computational and experimental results is an important but difficult step of this integration, particularly in the case of local quantities related to unsteady flows. In this work, decomposition methods are used to compare unsteady loads and pressure distributions coming from EFD and CFD. In particular, Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) are used to extract the dominant structures of the aerodynamic coefficients. The experimental data are obtained from dynamic pressure measurements in wind tunnel while numerical data come from two-dimensional unsteady Reynolds-Averaged Navier-Stokes (uRANS) simulations and tri-dimensional Delayed-Detached Eddy Simulations (DDES). This work shows that the decomposition methods represent a powerful tool enabling the analysis and the quantitative comparison of the main spatial and temporal characteristics of unsteady flows. Moreover, the accuracy of uRANS and DDES results is analyzed in light of the capacity of both CFD techniques to capture the reattachment occurring on the upper part of the rectangular cylinder. [less ▲]

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See detailBenchmarking the Environmental Impact of Green and Traditional Masonry Wall Constructions
Gauvreau-Lemelin, Corinne; Attia, Shady ULg

in Roaf, Susan (Ed.) Passive low energy architecture design to thrive (2017, July 03)

In Belgium, the most common approach for nearly Zero Energy Buildings is to comply with the locally modified version of the German Passive House (PH) Standard that requires a very low conductivity of ... [more ▼]

In Belgium, the most common approach for nearly Zero Energy Buildings is to comply with the locally modified version of the German Passive House (PH) Standard that requires a very low conductivity of exterior walls. The conventional PH brick constructions are dominated by building materials with high environmental impact including concrete blocks, firebrick and petrochemical insulation materials that produce a great amount of greenhouse gases (GHG). Moreover, there are very few studies that assessed the holistic environmental impact of conventional wall compositions against ecological wall compositions. Therefore, this research compares a traditional Belgian representative wall against a hemp block wall, according to the PH standard. The environmental impact of each wall is quantified through a life cycle assessment. The final results indicate that the hemp wall reinforced with a wood skeleton has a much lower impact on the environment: up to 60% reduction on total primary energy, 72% on climate changes, 93% on eutrophication, 61 % on ozone layer depletion and 74% on acidification. Future work may refine the assessment process. The study provides novel and significant findings that can inform building owners, architects and contractors and encourage them to choose environmentally friendly masonry wall compositions. [less ▲]

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See detailComparative Proteomics Analysis Provides New Candidates for Zinc Homeostasis Regulation in Arabidopsis
Amini, Sahand ULg; Arsova, Borjana ULg; Scheepers, Maxime ULg et al

Poster (2017, July 03)

Zinc (Zn) is an essential micronutrient for plants and around two billion people are depending on grains and legumes as their main Zn source. On the other hand, this transition metal is toxic for plants ... [more ▼]

Zinc (Zn) is an essential micronutrient for plants and around two billion people are depending on grains and legumes as their main Zn source. On the other hand, this transition metal is toxic for plants at high concentrations in soils. This calls for a better unravelling of Zn homeostasis regulation mechanisms, including sensing and signaling in plants. In order to fulfill this aim, we are testing for novel proteins involved in Zn homeostasis in the model plant Arabidopsis thaliana. First, quantitative proteomics was performed on root and shoot samples obtained upon Zn starvation and re-supply in different spatio-temporal conditions. Inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis was also performed for those treatments to measure the Zn concentration in tissues. It showed very rapid Zn uptake in root upon re-supply. Moreover, quantitative expression studies of known players of Zn homeostasis confirmed our large-scale proteomic results, although for a few genes lack of correlation between transcript and protein regulation was observed. Using clustering, statistical and gene ontology analyses, we selected candidate genes for further studies. Among more than 5000 detected proteins in roots by shotgun proteomics, 75 genes were selected for targeted analyses. In general, our results show that comparative proteomics study can be useful to reveal new players in the Zn regulatory network in plants, which can lead to new Zn biofortification and phytoremediation strategies. [less ▲]

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See detailHow much should you jump? Reproducibility evaluation of a 3-dimensional fatigability countermovement jump test
Paulus, Julien ULg; Schwartz, Cédric ULg; Tubez, François ULg et al

Conference (2017, July 02)

Introduction With the stop jump, the counter movement jump (CMJ) is probably the most used jump in sport. In the literature, a number of studies use the counter movement jump to explore (neuro-)muscular ... [more ▼]

Introduction With the stop jump, the counter movement jump (CMJ) is probably the most used jump in sport. In the literature, a number of studies use the counter movement jump to explore (neuro-)muscular fatigability [1-4]. However, due to the continuous [1-3] (or semi-continuous [4]) character of the test, the CMJ become drop jumps from the second one. Nevertheless, the drop jump isn't the most frequent jump type in sport. These evaluations, with (semi-)continuous jumps, don't reflect the sport reality and therefore a more effective (neuro-)muscular jumping fatigability evaluation must be validated. Methods Nineteen volleyball players (23,5 ± 3,3 years, 187,6 ± 6,6 cm, 77,5 ± 8,5 kg), with no history of (major) lower limb injury, submitted to two jumping fatigability tests, with seven days between each session, under the direction of a single researcher. The jumping fatigability tests consists of the repetition of 50 maximal CMJ at the rate of 33bpm. Between each CMJ, the subject were asked to make a full triple-extension and to wait the next auditory and visual signal of the metronome to start the hip-knee-ankle flexion. With these instructions, each jump remains a CMJ. Subjects were asked to leap as high as possible from the first to the last CMJ. The jumping height was recorder for each jump with three dimensional camera. The reproducibility was assessed by Standard Error of Measurement (SEM), Minimal Difference needed to be considered real (MD), Coefficient of Variation (CV), Pearson Correlation Coefficient (PCC) with 95% confidence interval, Effect Size Cohen (ES Cohen) with 90% confidence interval, paired Student's t-test, Intraclass Correlation Coefficient (ICC 2,1) with 95% confidence interval and Magnitude-Based Inferences (MBI). Results The results summary is available in the Table 1. In this table, only few parameters are presented and only for the partial sums of the first 10, 20, 25, 30, 40 and 50 jumps. Our analyses were based on the partial sums per interval of one jump and all statistical tests listed in "Methods" section have been considered. The partial sum with twenty-five CMJ have an excellent reproducibility (MBI with 0/99/1; ICC with 0.961 [0.902/0.985]; ES Cohen with -0.03 [-0.17/0.10]; PCC with 0.966 [0.911/0,987] and p-value < 0.0001). Moreover, it induce a great height decrease (-23%) and its duration (45.5 s) is similar to the recommendation for the knee fatigability isokinetic protocol [5]. MBI (+/trivial/-) Height decrease ICC (2,1) Test duration 10 0/100/0 -12,7% 0.967 18 s 20 0/99/1 -19,0% 0.964 36 s 25 0/99/1 -23,0% 0.961 46 s 30 0/98/1 -25,6% 0.955 55 s 40 0/98/1 -32,1% 0.950 73 s 50 0/98/2 -38,4% 0.943 91 s Table 1: reproducibility statistics results depending on the number of jumps considered (magnitude-based inferences (MBI) with percentage chances of better/trivial/worst retest vs test results; height jump decrease (last jump / better jump); ICC (2,1); test duration). Discussion Because of the (semi-)continuous character of a majority of fatigability jumping test [1-4], our test is the first, at our knowledge, to explore the reproducibility of a strict CMJ jumping fatigability task. Considering the statistical (relative and absolute) reproducibility results, twenty-five maximal CMJ seems to be the best compromise between reliability of the data and physiological interpretability of test's results. Indeed, its (relative and absolute) reproducibility is excellent and it induces a greater height decrease than shorter test while remaining similar in total duration than other fatigability tests which explore the anaerobic lactic system. References 1. Bosco et al, Eur J Appl Physiol Occup Physiol, 51(3):357-364, 1983. 2. Cormack et al., Int J Sports Physiol Perform, 3(2):131-44, 2008. 3. Dal Pupo et al., J Sci Med Sport, 17(6):650-5, 2014. 4. Meckel et al., J Strength Cond Res, 29(8):2122-7, 2015. 5. Bosquet et al., Int J Sports Med, 31(2):82-8, 2010. [less ▲]

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See detailCANINE GANGRENOUS MASTITIS : A CASE REPORT
Egyptien, Sophie ULg; Lefebvre, Michaël ULg; Guieu, Liz-Valéry ULg et al

Poster (2017, July)

This report describes the treatments and discusses the cost effectiveness of a Negative Pressure Wound Therapy (NPWT) device on a gangrenous mastitis case. Mastitis is an inflammation of the mammary gland ... [more ▼]

This report describes the treatments and discusses the cost effectiveness of a Negative Pressure Wound Therapy (NPWT) device on a gangrenous mastitis case. Mastitis is an inflammation of the mammary gland found mainly in lactating females. Coliforms (Escherichia coli), Staphylococcus spp (Staphylococcus aureus) and, to a lesser extent, Streptococcus spp are the most commonly isolated organisms in bitches. The bitch can be presented because of local signs of inflammation, puppies failing to thrive or even severe septic shock. While more common in ruminants, gangrenous mastitis is rare in the bitch. It is mostly due to Staphylococcus aureus, a gram positive and catalase positive bacteria producing alpha hemolysin. This toxin binds to ADAM10, a transmembrane protein, forming pores in the cell membrane, causing an acute inflammation via intracellular calcium flow, leading to severe oedema, necrosis and gangrene. Loss of skin integrity also comes from the cleavage of E-cadherin by ADAM10 after its toxin-mediated activation. A 8.7kg, 3-year-old neutered female Sheltie farm dog was referred to the Veterinary Clinic of the University of Liège for suspicion of septic peritonitis after an ovariohysterectomy on 4 dead puppies 36 hours earlier. They died during long lasting dystocia. Amoxicillin-acid clavulanic and enrofloxacin antibiotherapy had been initiated during surgery. The dog was in decompensated septic shock. The surgical wound was not reactive and no sign of peritonitis was seen by abdominal ultrasonography. The right inguinal and the two most caudal left mammary glands were swollen, crackling with a patchy blue discoloration. An acute fulminant mastitis with gangrenous involvement and sepsis was diagnosed. Fluids and continuous rate infusion of norepinephrine and dobutamine were administered to control severe hypotension. Metronidazole was added since Clostridium spp could not be excluded. Debridement was started as soon as the arterial pressure was stabilised and the wound was disinfected with hydrogen peroxyde for the 3 first days. While hydrogen peroxyde is indicated for catalase negative infections, the already started antibiotherapy prevented bacterial identification and sensitivity determination. Alginate-honey patches replaced wet to dry bandages after 4 days. After 7 days of progressive debridement, the wound was 15cm long, 13cm wide and 1.2cm deep. A NPWT device was placed under anaesthesia after extensive debridement. It was kept in place for one week with one renewal after 2 days under slight sedation. The wound was then surgically closed. Cutaneous sutures were removed 10 days later as cicatrization was satisfactory. NPWT is indicated in open wound management, for infection control and for stimulating granulation tissue production prior to reconstruction. It increases contraction in deep, three dimensional wounds. Closure rate is significantly shorter with NPWT than with standard wet to dry bandages. Cost of NPWT is comparable to standard bandages but more comfortable for the patient. Standards bandages require daily changes, sometimes for several weeks and under repeated anaesthesias, which may be debilitating for the patient and expensive for the owner. Conversely, NPWT is changed only once and allows earlier surgical closure of the wound. The main complication is vacuum loss, which is surgeon’s experience dependant. [less ▲]

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See detailFunctional refractory molds for metal casting built by additive manufacturing
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2017, July)

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting ... [more ▼]

Additive manufacturing is more and more used in the field of industry. This technique is notably employed in investment casting process in order to build cores and models. Nevertheless investment casting remains not cost effective in case of prototypes and very small series due to the quite large amount time needed to build and dry the molds. Additive manufacturing may also be used to directly shape metal parts but several problems are still linked to this technique as the presence of local defects in parts and the limitation of the number of metal or alloy available for this technique on the market. We propose an intermediate method that permits to build directly molds and cores by additive manufacturing using equipment initially dedicated to build metal parts. This method presents the main advantage to cast with a large variety of metals or alloys using a single ceramic material and only one set of building conditions. The properties of the casted parts are very similar with those produced by investment casting. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of some casting defects. The use of alumina processed by selective laser melting (SLM) is shown and its outstanding resistance to temperature differential is demonstrated through casting trials with two diffferent representative alloys. Casting trials in industrial conditions will be illustrated. [less ▲]

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See detailÉvaluation de la capacité du Modèle Atmosphérique Régional (MAR) à simuler la saison des pluies en Afrique Intertropicale
Doutreloup, Sébastien ULg; Wyard, Coraline ULg; Belleflamme, Alexandre ULg et al

in Dahech, Salem; Charfi, Sami (Eds.) Actes du XXXe colloque de l'Association Internationale de Climatologie : CLIMAT, VILLE ET ENVIRONNEMENT (2017, July)

In Intertropical Africa, climate is essentially characterized by the amount of precipitation and its annual regime. These precipitations and their evolution during the period 1970-1999 are simulated ... [more ▼]

In Intertropical Africa, climate is essentially characterized by the amount of precipitation and its annual regime. These precipitations and their evolution during the period 1970-1999 are simulated thanks to the Regional Atmospheric Model (MAR), developed at the ULg, and forced by the NCEP1 reanalyses and by the outputs of three global models (GCM) of the CMIP5 database. These MAR simulations are compared to the gridded data of the Climate Research Unit (CRU). It is clear from our investigations that the simulation of the MAR model forced by the NCEP1 reanalyses is better reproducing the quantities as well as the annual rainfall regime in the semi-arid regions than in equatorial regions. On the other hand, simulations of the MAR forced by the outputs of the GCMs are globally unsatisfactory throughout the intertropical domain in terms of quantities as well as the seasonality of precipitation. [less ▲]

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