References of "Scientific congresses and symposiums"
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See detailA technological and functional examination of the Aurignacian end-scrapers from Grotta di Fumane
Aleo, Alessandro; Duches, Rossella; Rots, Veerle ULiege et al

Poster (2017, September)

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See detailAssessing Landscape Quality: is there a consensus among experts?
Vanderheyden, Vincent ULiege; Schmitz, Serge ULiege

Conference (2017, September)

The paper analyses how 42 landscape experts from Wallonia and Romania mark their agreement on 52 Likert-items regarding landscape quality.

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See detailTD-GCxGC-HRTOFMS in biological applications 
Focant, Jean-François ULiege; Pesesse, Romain ULiege; Dubois, Lena ULiege et al

Conference (2017, September)

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See detailSmallest salable patent practicing unit (SSPPU) and component licensing: Why $1 is not $1?
Gautier, Axel ULiege

Conference (2017, September)

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See detailLes modes d'acquisition et de transmission du savoir médical dans l'antiquité gréco-romaine
Marganne, Marie-Hélène ULiege

in Histoire des Sciences Médicales (2017, September), 51(2), 163-173

This paper aims to define and describe the ways of acquiring and transmitting medical knowledge in Greco-Roman Antiquity through an analysis of literary, archaeological, and, primarily, papyrological ... [more ▼]

This paper aims to define and describe the ways of acquiring and transmitting medical knowledge in Greco-Roman Antiquity through an analysis of literary, archaeological, and, primarily, papyrological sources. The methods and practices revealed by these sources include experiment, analogy, and imitation, oral and written teaching, the composition and copying of books (illustrated or not), as well as the elaboration of commentaries, abridgments, questionnaires, and word lists. These modes of knowledge transfer were intended not only for medical practitioners and students, but also for philiatroi, for generally educated people, as well as for scribes, and eventually tachygraphers, of medical books. [less ▲]

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See detailSMART RIVERS 2017
Rigo, Philippe ULiege; MUSKATIROVIC, JASNA; JAIMURZINA, AZHAR et al

in SMART RIVERS 2017, Pittsburgh (PIANC) (2017, September)

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See detailUseful tools for genome editing in the non-conventional yeast Yarrowia lipolytica
Vandermies, Marie ULiege; Denies, Olivia ULiege; Nicaud, Jean-Marc et al

Poster (2017, September)

The non-conventional yeast Yarrowia lipolytica is increasingly used for the production of recombinant proteins or biomolecules with biotechnological or pharmaceutical applications. The development of such ... [more ▼]

The non-conventional yeast Yarrowia lipolytica is increasingly used for the production of recombinant proteins or biomolecules with biotechnological or pharmaceutical applications. The development of such a cell factory requires steps of genome editing that rely on selectable markers. The recently identified EYK1, encoding erythrulose kinase, can serve as an efficient catabolic selectable marker for genome editing in Y. lipolytica. Besides, the cloning-free strategy developed here simplifies the construction of disruption cassettes for genome editing in Y. lipolytica. [less ▲]

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See detailDifferentiating pre- and post-grazing pasture heights using a 3D camera: a prospective approach
Andriamandroso, Andriamasinoro ULiege; Castro Muñoz, Eloy ULiege; Blaise, Yannick ULiege et al

in Berckmans, Daniel; Keita, Alassane (Eds.) Precision Livestock Farming ‘17 (2017, September)

Grasslands management involves the monitoring of both animal and plant components. Recent precision livestock farming developments have focused on high-rate monitoring of grazing animals to enhance ... [more ▼]

Grasslands management involves the monitoring of both animal and plant components. Recent precision livestock farming developments have focused on high-rate monitoring of grazing animals to enhance livestock productivity and welfare. The evolution of grass resource during the grazing process is not being overlooked by graziers and researchers, but grass characteristics, such as height, dry matter content, productivity or density, are still measured using low frequency and sometimes destructive and time-consuming methods; such as quadrat, sward-sticks, rising plate meters. This study investigated the potential of using 3D cameras to assess sward physical characteristics. Main objectives were: (1) to define the correct way to capture images, particularly the camera position above the ground and, (2) to assess if differences in sward height were detectable. Couples of images differing in grass height were captured on the same spot with a 3D camera at different above-ground heights (30, 40, 50 cm) on a ryegrass-white clover pasture. Pregrazing height was 15cm and post-grazing sward was simulated by cutting at 2 cm. Histograms of intensity performed on greyscale images showed differences between pre- and post-grazing sward. As expected, overall darker pixels were observed for pre-grazing images (p<0.01) and whiter pixels for post-grazing images (p<0.01), indicating longer distances consistent with lower forage biomass. Images taken at a distance of 30 and 40 cm could identify these differences. Further developments require improving the calibration of the camera and developing image analysis method to estimate more plant characteristics such as density or dry matter content. [less ▲]

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See detailComparaison entre infiltrations de plasma riche en plaquettes et d’acide hyaluronique pour le traitement des tendinopathies patellaires
Kaux, Jean-François ULiege; Roberjot, Mathieu; Samson, Antoine

in 10ème Congrès Commun SFMES-SFTS (2017, September)

Introduction : Le traitement des tendinopathies patellaires reste difficile. C’est la raison pour laquelle de nouveaux traitements ont été développés, parmi lesquels les injections de plasma riche en ... [more ▼]

Introduction : Le traitement des tendinopathies patellaires reste difficile. C’est la raison pour laquelle de nouveaux traitements ont été développés, parmi lesquels les injections de plasma riche en plaquettes (PRP) ou d’acide hyaluronique (AH). Certaines séries cliniques ont précédemment évalué l’effet du PRP dans le traitement des tendinopathies patellaires proximales. Une revue systématique récente a conclu que les PRP pouvait être recommandé comme traitement dans cette indication. Récemment, l’AH en injection a été proposé comme traitement des tendinopathies. Certaines études fondamentales montrent des résultats encourageants sur la capacité de l’AH à promouvoir le glissement du tendon, de réduire les adhérences et améliorer son organisation architecturale. Quelques observations cliniques confirment également son impact sur la douleur et la fonction de patients avec tendinopathies. Méthodes : Trente-trois sportifs avec tendinopathies patellaires proximales non soulagés après plus de trois mois de traitements rééducatif classique ont été inclus dans l’étude. Dix-huit d'entre eux (groupe 1) ont reçu une injection de PRP pauvre en leucocytes (obtenu à l’aide d’un appareil d’aphérèse) et 15 autres sujets (groupe 2) ont bénéficié de 2 injections d’AH à 1 semaine d’intervalle; les 2 groupes ont bénéficié d’une rééducation standardisée post-infiltration. Concernant le suivi de la pathologie, une évaluation de la douleur par une échelle visuelle analogique (EVA), des scores algo-fonctionnels (IKDC, VISA-P), un algomètre de pression, un test isocinétique (associé à une EVA)) ainsi qu’une échographie du tendon patellaire (US) ont été réalisés à 3 reprises (avant injection, après 6 semaines, 3 mois après les injections). Résultats : Les résultats de l’EVA (p < 0,01), de l’algomètre de pression (p < 0,01), les scores IKDC (p < 0,01) et VISA-P (p < 0,01) montrent une amélioration significative dans les deux groupes, mais pas pour les résultats US. Pour le groupe 1, les tests isocinétiques montrent des résultats significatifs pour les ischio-jambiers à C60 °/ s, avec une amélioration de son couple de pointe maximale (p = 0, 01) pour le membre pathologique et une amélioration des différences bilatérales (p = 0,0002). Pour le groupe 2, l’amélioration du couple de pointe maximale du quadriceps à C240 ° /s est significative (p < 0,01) pour le genou pathologique après les injections après 6 semaines seulement. L’EVA associé aux tests isocinétiques diminue considérablement pour tous les modes de contraction au terme des trois mois d’études. Conclusions : Les infiltrations de PRP et d’HA peuvent toutes les 2 améliorer les symptômes de tendinopathie patellaire proximale, même si les résultats sont légèrement meilleurs au sein du groupe PRP. [less ▲]

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See detailPromoting "health literacy friendly" healthcare institutions
Henrard, Gilles ULiege

Poster (2017, September)

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See detailTowards understanding the function of JOINTLESS gene in tomato inflorescence
Huerga Fernandez, Samuel ULiege; Gómez Roldán, Maria Victoria; Orman-Ligeza, Beata ULiege et al

Poster (2017, September)

The lack of fruit abscission is a trait of great agronomical value. In tomato, the jointless phenotype, referring to the lack of abscission zone (AZ) in the flower pedicel, has been obtained by two ... [more ▼]

The lack of fruit abscission is a trait of great agronomical value. In tomato, the jointless phenotype, referring to the lack of abscission zone (AZ) in the flower pedicel, has been obtained by two independent mutations, named jointless (j) and jointless-2 (j-2). The corresponding genes encode MADS-box transcription factors, as shown in 2000 for J (Mao et al. 2000) and very recently for J-2, known as SlMBP21 (Gomez-Roldan et al., 2017). Similar to the quartet model of MADS-box protein complexes regulating floral organ formation, J and J-2 interact with MADS-box partners, among which MACROCRALYX (MC), to regulate AZ formation (Liu et al. 2014). In addition to - or in connection with - AZ formation, J acts during the building of the inflorescence to regulate meristem fate. Indeed j mutants produce leafy inflorescences characterized by faster flower maturation and resumption of vegetative meristems (Périlleux et al. 2014). For these traits, j is epistatic to j-2. The involvement of J in the regulation of meristem fate is consistent with the roles of its closest homologs in Arabidopsis, AGAMOUS LIKE 24 (AGL24) and SHORT VEGETATIVE PHASE (SVP). Our goal is to identify J targets in order to unravel its multiple functions in the tomato inflorescence. [less ▲]

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See detailPreparation and characterization of Silicon-carbon composite powders using recycled Silicon from solar cells as anode material in Li-ion batteries
Eshraghi, Nicolas ULiege; Mahmoud, Abdelfattah ULiege; Berardo, Loris ULiege et al

Poster (2017, September)

Currently, silicon (Si) coming from the recycling of solar cells is a non-valued fraction. The principal aim of this work is the development of silicon recovered during the dismantling of solar panels as ... [more ▼]

Currently, silicon (Si) coming from the recycling of solar cells is a non-valued fraction. The principal aim of this work is the development of silicon recovered during the dismantling of solar panels as electrode material for Li-ion batteries. The main technological challenge associated with the use of silicon in this type of application is to control the volume expansion during charge/discharge cycles. This drawback could be avoided through the formation of Silicon/carbon composites in which the size of the silicon particles and their dispersion must be controlled. In this research, we develop a carbon matrix consisting of graphene or carbon nanotubes (CNT) that allow the incorporation of silicon particles coated with a carbon layer (Si@C/C). The process is divided in two main steps : I) the grinding of leached Si wafer pieces in order to extract pure Si powder and then a mixed aqueous suspension of this recycled Si and an organic carbon source (Acetic acid, Ascorbic acid or Lactose) is spray-dried followed by heat treatment to generate the coating of silicon particles with carbon (Si@C). Then, II) aqueous suspension of Si@C and graphene/CNT is spray dried and calcined to obtain the final composite structure (Si@C/C). The morphology of composite materials is analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical performance of Si@C/C composites are characterized by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy (EIS). [less ▲]

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See detailPedagogical and didactic adaptations of a mathematics course to a student-centred education in an architecture programme
Jancart, Sylvie ULiege; Seijkens, Nicolas ULiege; Silvestre, Aude ULiege

Conference (2017, September)

This presentation will focus on both didactic and pedagogical reflections teaching mathematics in architecture programme in order to support the experience and learning of first year students. Led in ... [more ▼]

This presentation will focus on both didactic and pedagogical reflections teaching mathematics in architecture programme in order to support the experience and learning of first year students. Led in order to promote the students’ intrinsic motivation (Deci & Ryan, 1985) and support our didactic reflections, an inventory of mathematical difficulties encountered by freshmen in their program has been established. This inventory also served the purpose of demystifying mathematics and valuing them through a place in a cursus more rooted in the profession (Wigfield and Eccles, 2000). Sorted according to the skills involved, the relevant difficulties pointed out by students were mostly found in two courses, topography and structure. Several examples will be presented demonstrating the lack of transfer between the disciplines, students studying formulas without understanding them. To counter this lack of transfer, pedagogical reflections about our current teaching were developed thanks to the Feedback First-Year Project (FFYP) developed in the University of Liège. In this context, three significant devices set up in mathematics were developed. The first one is an online-oriented prerequisite test implemented on our academic online platform. The second one is an intermediate test based on true/false quizzes and the third one a simulation of the real exam with peer interventions. According to Nicol’s recommendations (2009), each of these features is completed with specific feedbacks specially designed in order to impact several dimensions of their motivation. [less ▲]

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See detailDamage Detection in Structures Based on Principal Component Analysis of Forced Harmonic Responses
Golinval, Jean-Claude ULiege

in Procedia Engineering (2017, September)

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much ... [more ▼]

An approach based on principal component analysis (PCA) is considered here to tackle the problem of structural damage detection. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. PCA is applied here to the problem of damage detection in structures submitted to harmonic excitation. When processing vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The method is illustrated on the example of a real truss structure for damage detection and is combined to a model updating technique for damage localization. [less ▲]

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See detailVINYLIC COPOLYMERS FOR PH-SENSITIVE LIPID NANOCAPSULES
Pautu, Vincent ULiege; Lepeltier, Elise; Debuigne, Antoine ULiege et al

Poster (2017, September)

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See detailPhoto-Ionization GCxGC-HRTOF/MS for Aviation Fuel Characterization
Giri, Anupam ULiege; Courtiade; Racaud et al

Conference (2017, September)

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See detailLexical Diachronic Semantic Maps
Georgakopoulos, Athanasios ULiege; Polis, Stéphane ULiege

Poster (2017, September)

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See detailFlowering roots: Insensitive Root Growth 1 contributes to photoperiod-induced root responses in Arabidopsis.
Orman-Ligeza, Beata ULiege; Detry, Nathalie ULiege; Tocquin, Pierre ULiege et al

Poster (2017, September)

The capacity to perceive and respond to seasonal changes of day length is essential for flowering plants. Under favourable photoperiod, a mobile stimulus synthesized in leaves moves to the shoot apex and ... [more ▼]

The capacity to perceive and respond to seasonal changes of day length is essential for flowering plants. Under favourable photoperiod, a mobile stimulus synthesized in leaves moves to the shoot apex and triggers the expression of genes required for the transition to flower initiation. Although transition from vegetative to reproductive state also encompasses a transcriptional response in roots, the internal signalling pathways and how root system architecture adjusts to this changing status remain elusive. Here we show in Arabidopsis that root growth rate increases upon a transfer to flowering-inductive long days while remaining constant under short days. To elucidate genetic components of this response, we performed a meta-analysis of available root-growth and flowering-related arrays and selected genes with overlapping transcriptional profiles for further analyses. Loss of function in a member of the basic leucine zipper transcription factor gene family, hereafter named Insensitive Root Growth-1 (IRG1), was found to suppress photoperiod-response of root growth with no defect in flowering time. We show that sucrose, but neither glucose nor mannitol in the growth medium under long days, is needed to trigger this response. In addition, extending the photoperiod with non-photosynthetic far red light had no effect on root growth of irg-1 mutant, alike wild type Col-0. The expression level of IRG1 in the roots remains low during the daytime and peaks late at night, suggesting that this gene is regulated by the clock’s evening loop. Taken together, our results suggest that IRG1 may be involved in sucrose-mediated stimulation of root growth during the night phase in Arabidopsis. The functional characterisation of IRG1 is currently underway. [less ▲]

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See detailDefeatist performance beliefs in a sample of individuals with persistent negative symptoms
Thonon, Bénédicte ULiege; Li, Xueying; Velligan, Dawn

Poster (2017, September)

Objective Negative symptoms of schizophrenia, in particular motivational deficits, have showed to be linked to dysfunctional attitudes, such as defeatist performance beliefs. This relationship has been ... [more ▼]

Objective Negative symptoms of schizophrenia, in particular motivational deficits, have showed to be linked to dysfunctional attitudes, such as defeatist performance beliefs. This relationship has been found in various types of samples but has not been investigated in samples of individuals presenting persistent negative symptoms (PNS). The present study aimed to assess the relationship between defeatist performance beliefs and negative symptoms in a sample of individuals diagnosed with schizophrenia and PNS. Another objective was to evaluate the link between change in defeatist beliefs and change in negative symptoms, before and after psychosocial intervention. Methods Fifty-one participants diagnosed with schizophrenia and PNS followed 9 months of Motivation and Engagement Training. They were assessed before and after the intervention using the Negative Symptom Assessment (NSA), the Brief Negative Symptom Scale (BNSS), the Clinical Assessment Interview for Negative Symptoms (CAINS), and de the Defeatist Performance Beliefs scale. Results At baseline, defeatist performance beliefs were not significantly associated with negative symptoms, except with the motivation factor of the BNSS, but only at the trend level. However, change in defeatist beliefs was moderately correlated with change in motivation, as measured with the BNSS, but not with the other measures. Conclusion These results underlie the necessity of broadening the targets of psychosocial interventions to factors related to negative symptoms other than dysfunctional attitudes. [less ▲]

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See detailVisco-plastic Chaboche model for nickel-based alloys under anisothermal cyclic loading
Morch, Hélène ULiege; Duchene, Laurent ULiege; Habraken, Anne ULiege

in Proceedings of the XIV International Conference on Computational Plasticity (2017, September)

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have ... [more ▼]

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have more or less influence on the overall behavior depending on the considered temperature. The unified constitutive model developed by Chaboche [1] is very efficient in representing this complexity as it is very adaptable and can contain many features. A basic Chaboche model contains a viscosity law and one or several hardening equations. Within these hardening equations, it is possible to add several features that will represent the complex behavior of the material. The aim of this study is to understand the role of the different parameters and the influence of the different features in an advanced Chaboche model adapted to cyclic anisothermal loading. This specific model was also developed in [2],[3]. However, part of this study is based on particular cases where different features of the model are analyzed [4]–[6]. [less ▲]

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See detailPhysical activity counseling: Creation of a formation for students in physical education
Lombard, Gilles ULiege; Jansen, Adrien ULiege; Cloes, Marc ULiege

Conference (2017, September)

The WHO (2015) estimates to 1 million deaths par year due to physical inactivity in Europe. The promotion of children physical activity is the starting point as active children are more likely to remain ... [more ▼]

The WHO (2015) estimates to 1 million deaths par year due to physical inactivity in Europe. The promotion of children physical activity is the starting point as active children are more likely to remain active in adulthood than the others (ACSM et al., 2015). According to ecological model (Booth, 2001) school and teachers are essentials determinants to encourage children in this way. Then, we decided to implement a unit aiming to train physical education students to be able to counselling children and sedentary people. The first step was to interview 15 field professionals supposed to be involved in physical activity promotion in order to identify the essential factors to point out. The second step was to design a formation plan allowing to fill gaps in students skills. The last point will be to implement this formation and to analyse the impact on students actions. [less ▲]

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See detailRecycling of silicon used in solar cells to prepare silicon-carbon composite powders as anode material in li-ion batteries
Eshraghi, Nicolas ULiege; Mahmoud, Abdelfattah ULiege; Berardo, Loris ULiege et al

Poster (2017, September)

Currently, silicon (Si) coming from the recycling of solar cells is a non-valued fraction. The principal aim of this work is the development of silicon recovered during the dismantling of solar panels as ... [more ▼]

Currently, silicon (Si) coming from the recycling of solar cells is a non-valued fraction. The principal aim of this work is the development of silicon recovered during the dismantling of solar panels as an electrode material for lithium or sodium batteries. The main technological challenge associated with the use of silicon in this type of application is to control the volume expansion during charge/discharge cycles. This problem could be solved through the synthesis of Silicon/carbon composites in which the size of the silicon particles and their dispersion must be controlled [1–4]. We develop a carbon matrix consisting of graphene or carbon nanotubes (CNT) that allow the incorporation of silicon particles coated with a carbon layer (Si@C/C). The process is divided in two main steps. In the first step, Si wafer pieces are ground to prepare Si powder and then a mixed suspension of Si and an organic carbon source (Acetic acid, Ascorbic acid or Lactose) is spray-dried followed by heat treatment to generate the coverage of silicon particles with carbon (Si@C). In the second step, aqueous suspension of Si@C and graphene/CNT is spray dried and heat treated to obtain the final composite structure. The morphology of composite materials is analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electrochemical performance of Si@C/C composites are characterized by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy (EIS). [less ▲]

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See detailThe acoustic correlates of hypnotic voice
Remacle, Angélique ULiege; Todovora, Tatiana; Zambra, Nurihan

Poster (2017, August 31)

Although the linguistic content of hypnotic suggestions has been investigated in various studies, the paralinguistic aspects – that is, the voice used by hypnotherapists – are little described. The few ... [more ▼]

Although the linguistic content of hypnotic suggestions has been investigated in various studies, the paralinguistic aspects – that is, the voice used by hypnotherapists – are little described. The few indications concerning vocal patterns that promote a state of hypnotic trance are limited to subjective descriptions based on clinical observations, as reported in textbooks (Grinder & Bandler, 1997; James, 2010). From an empirical point of view, voice characteristics have been assessed objectively with acoustic measures in the context of muscle relaxation (Knowlton & Larkin, 2006); however, to the best of our knowledge, such measures have not been applied to identify vocal indices of the voice used to induce hypnosis. The aim of this study is to investigate the existence of a voice pattern specific to hypnosis. To that end, 32 French-speaking therapists (18 women and 14 men) who practice hypnosis in a medical or psychological context were recorded while reading a single text in two conditions: with a normal voice and with a voice used for hypnotic induction. For each of these two conditions, the following acoustic analyses were conducted with Praat software: degree of voicing (in %), mean fundamental frequency (F0, in Hz), mean sound pressure level (SPL, in dB), and variability of F0 and SPL. Statistical analyses (Wilcoxon test) show that, compared to a normal voice, a hypnotic voice presents less voicing (p<.001), lower F0 and SPL (p<.001), less SPL variability (p=.003), and a trend toward less F0 variability (p=.056). These preliminary results allow us to provide objective acoustic correlates of a hypnotic voice, such as low frequency, low intensity, monotone and lack of voicing. These acoustic characteristics correspond to the subjective voice descriptions given in textbooks, such as quiet, gentle, reassuring, and warm, which tend to create a sense of intimacy and confidentiality. Regarding the lower degree of voicing in hypnotic voices, subsequent analyses will make it possible to test the hypothesis that the voice is breathy and whispery, at least at times, and that there are longer pauses than in a normal voice. Analyses of spontaneous speech during hypnosis sessions are currently under way to test the generalizability of the results presented here. References -Grinder, J., & Bandler, R. (1997). Patterns of the hypnotic techniques of Milton H. Erickson, M.D. Vol. I. Portland, OR: Metamorphous Press. -James, U. (2010). Clinical hypnosis textbook: A guide for practical intervention (2nd ed.). Oxford, UK, New York: Radcliffe Publishing Ltd. -Knowlton, G. E., & Larkin, K. T. (2006). The influence of voice volume, pitch, and speech rate on progressive relaxation training: Application of methods from speech pathology and audiology. Applied Psychophysiology and Biofeedback, 31(2), 173–185. doi:10.1007/s10484-006-9014-6 [less ▲]

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See detailOnline ICPC-2 & Q-Codes: General Practice / Family Medicine Online Multilingual Terminology & Knowledge Base
Jamoulle, Marc ULiege

Conference (2017, August 31)

Availability of ICPC-2 and Q-Codes in URI format

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See detailEvidence-Based Practice Applied To Voice Therapy
Morsomme, Dominique ULiege

Conference (2017, August 30)

Voice therapy supports dysphonic patients. To rehabilitate the dysphonic patient, each voice therapist uses different exercises. These exercises are mostly described in books, which offer a step-by-step ... [more ▼]

Voice therapy supports dysphonic patients. To rehabilitate the dysphonic patient, each voice therapist uses different exercises. These exercises are mostly described in books, which offer a step-by-step acquisition model of the required vocal motor gesture and propose techniques of voice rehabilitation. However, the same technique can cover different therapeutic aspects. Van Stan et al. (2015) recently suggested a taxonomy to clarify therapeutic programs, detail their content and classify them according to their direct intervention category (auditory, vocal function, somatosensory, musculo-skeletal, and respiratory). Sensitize the patient to vocal hygiene, teach the basics of respiratory support, adjust the subglottal pressure, encourage vocal placement in the resonators, replace the wrong motor gesture with another healthier, controlling glottal attacks are the rehabilitation principles basics for voice disorders. All exercises are generally based on raising awareness of both inadequate and adequate vocal gesture by increasing proprioception. The final goal is that the patient gradually regains control over his vocal gesture. To ensure the best treatment to the patient, our approach must rely on the evidence based practice (EBP) principles. The questions we must ask ourselves as clinician are: Which voice techniques, for which patients, with which diagnoses, in what environments, with what effectiveness? This workshop attempts answering the question: how can a voice therapist implement EBP in his clinical practice in order to ensure the best treatment to his patient? To illustrate the process, I opted for a therapeutic approach that has been questioned: manual therapy adapted to voice therapy. I will address the notion of therapeutic efficiency of the manual therapy in the light of the scientific literature, knowing that level 1A or 1B studies on the classification of evidence levels are rare in the field of vocology (Benninger, 2011). To end the workshop, I will present short video sequences of voice therapy with three patients and their therapist who have kindly accepted to be filmed during their sessions. These sequences illustrate how manual therapy is implemented in the treatment of these patients who suffer from presbyphonia, muscle tension dysphonia and nodules respectively. [less ▲]

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See detailIdeal future dairy farm: a Walloon breeders’ point of view
Dalcq, Anne-Catherine ULiege; Soyeurt, Hélène ULiege; Dogot, Thomas ULiege et al

Conference (2017, August 30)

This research aims to characterize the dairy breeders regarding their idea of the ideal future farm ensuring them an income, in order to highlight their present situation and the ways to advise them ... [more ▼]

This research aims to characterize the dairy breeders regarding their idea of the ideal future farm ensuring them an income, in order to highlight their present situation and the ways to advise them towards their wished dairy model. The 245 answers to a survey of breeders, conducted between November 2014 and February 2015 provided information about, amongst others, their wishes concerning the intensification, the specialization, the technological innovation, the kind of workforce, structure, market and milk production (standard vs. differentiated quality milk). Based on this information, a Multiple Correspondence Analysis allowed to create 4 groups of breeders with a similar view of their ideal farm: global-based intensive (GBIb), local-based extensive (LBEb), intermediate and no-opinion breeders. The relationships between these groups and the other recorded qualitative variables as formation needed, obstacles and advantages of breeders organization, of diversification and so forth w ere studied using Chi Square tests and Correspondence Canonical Analysis. A moderate link was observed between the ideal future farm and the current situation of the respondent. This suggested that not all the breeders were in the production system that they considered as most profitable. As a brake to the transformation and diversification, GBIb tended to be more numerous to speak about the uncertainty of the customer loyalty (p-value = 0.07) and LBEb pointed out the size of the investments (p-value = 0.05). LBEb asked more for administrative (p-value = 0.04) and transformation and diversification formations (p-value = 0.03) while GBIb looked more for finance and management formation (p-value = 0.02). In conclusion, there were different ideal dairy farm models considered by the breeders. Their needs were not similar and indicated which tools must be developed and which domain must be studied to support them. [less ▲]

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

Conference (2017, August 30)

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 detailThe Economic Development Pole (EDP) approach in Niger: the case of the Niger-IFAD Program
Andres, Ludovic ULiege; Populin, Martha; Bodé, Sambo et al

Poster (2017, August 29)

Since 2012, the Niger-IFAD Programme uses a new non-administrative geographical intervention unit, the Economic Development Pole (EDP). The EDP is described as a space concentrating economic activities ... [more ▼]

Since 2012, the Niger-IFAD Programme uses a new non-administrative geographical intervention unit, the Economic Development Pole (EDP). The EDP is described as a space concentrating economic activities linked to the production and commercialization of the main agro-pastoral products of the neighbouring production basins. This poster aims to describe and analyze the concept of EDP, to show its first results when put into practice and to analyze its risks. [less ▲]

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See detailMultiple Uses of a 3D Point Cloud: the Castle of Franchimont (Province of Liège, Belgium)
Luczfalvy Jancsó, Andrea ULiege; Jonlet, Benoît ULiege; Hallot, Pierre ULiege et al

Poster (2017, August 29)

This poster presents the identified obstacles, needs and selected solution for the study of the medieval castle of Franchimont, located in the province of Liège (Belgium). After taking into account the ... [more ▼]

This poster presents the identified obstacles, needs and selected solution for the study of the medieval castle of Franchimont, located in the province of Liège (Belgium). After taking into account the requirements from all the disciplines at work as well as the problems that would have to be tackled, the creation of a 3D point cloud was decided. This solution would be able to deal with the characteristics and needs of a research involving building archaeology and related fields. The decision was made in order to manage all of the available data and to provide a common working tool for every involved cultural heritage actor. [less ▲]

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

Conference (2017, August 29)

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See detailPrésentation de la thématique de recherche et du programme de la journée
Simons, Germain ULiege

Conference (2017, August 25)

Dans cette introduction, G. Simons montre comment la notion de "tâche complexe" s'est construite progressivement en Communauté française de Belgique depuis le Décret "Missions". Ensuite il propose ... [more ▼]

Dans cette introduction, G. Simons montre comment la notion de "tâche complexe" s'est construite progressivement en Communauté française de Belgique depuis le Décret "Missions". Ensuite il propose différentes questions qui baliseront la réflexion tout au long de la journée. Enfin, il présente le programme du colloque et remercie toutes les personnes qui ont contribué à son organisation. [less ▲]

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See detailFragmentation index of DNA sperm in llama semen (Lama glama)
Cucho, Hernan; Ordonez, Cesar; Ampuero, Enrique et al

Poster (2017, August 25)

DNA fragmentation of spermatozoa is an important indicator of seminal quality and fertility. The quality of the genetic information contained in the DNA molecule transmitted by the spermatozoa is ... [more ▼]

DNA fragmentation of spermatozoa is an important indicator of seminal quality and fertility. The quality of the genetic information contained in the DNA molecule transmitted by the spermatozoa is important for the proper development of the embryo. In humans it has been shown that there is a significant correlation between sperm DNA damage and oocyte fertilization, embryo quality, development to blastocyst and embryo implantation. The objective of this study was to analyze the fragmentation of DNA sperm in llama semen collected by post-copulation vaginal aspiration. The collection of 4 llamas was performed on three occasions per animal. The volume, motility, concentration, vitality, sperm membrane functionality assessed with the Integrated Semen Analysis System - ISAS®. The DNA fragmentation index was tested with the Halomax system ®(Halotech company). Volume, motility, vitality and sperm concentration respectively were 1.3 ± 0.8 ml, 12.30 ± 2.02%; 64.69 ± 11.39% and 183.55 ± 28.48 x 106 spz/ml. The functionality of the sperm membrane was 64.95 ± 11.63% and sperm DNA fragmentation index 11.58 ± 13.25%. The values of these different parameters indicate the high quality of the collected semen. [less ▲]

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See detailUniversité d'été du CIFEN - Atelier 2 :Tâches complexes dans les formations professionnalisantes
Francois, Nathalie ULiege; Simons, Germain ULiege

Conference (2017, August 25)

Introduction et synthèse de l'atelier consacré aux tâches complexes dans les sections professionnalisantes de différents niveaux d'enseignement en Fédération Wallonie Bruxelles.

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Peer Reviewed
See detailVariation of tree allometry and aboveground biomass in central African forests
Loubota Panzou, Grâce Jopaul ULiege; Ligot, Gauthier ULiege; Bastin, Jean-François et al

Conference (2017, August 23)

Quantifying the biomass and carbon stocks contained in tropical forests has become an international priority for the implementation of the REDD+ initiative. Many techniques exist to estimate forest ... [more ▼]

Quantifying the biomass and carbon stocks contained in tropical forests has become an international priority for the implementation of the REDD+ initiative. Many techniques exist to estimate forest biomass at different spatial scales, but all ultimately rely on allometric equations calibrated on destructive measurements of individual tree biomass, in order to convert forest inventory data into biomass estimates. For many tropical forest ecosystems, that are structurally complex and species rich, these allometric equations have not yet been developed and general allometric equations are being used instead, with possibly local adjustment of tree allometry with non-destructive data. Variation in height-diameter allometry and in crown-diameter allometry across forest types and environmental conditions have been demonstrated to be of extreme importance for the estimation of biomass and carbon stocks in tropical forests, but yet poorly explored in central Africa. In this study we aimed to determine the variation in tree height-diameter and crown-diameter allometries across central African forests and the consequences for biomass and carbon stocks. Tree allometry data were collected in two of semi-deciduous forest sites in northern Republic of Congo that have vastly different substrate and soils (clay soils on quartzite and sandy soils on sandstone plateau), and forest communities, but similar rainfall regimes. These data will be analyzed to test two hypotheses: (i) tree allometry strongly varies across forest types with contrasted environmental conditions (and specifically soils), and (ii) both allometry and forest structure contributed to the greater biomass of the site on rich soil (quartzite substrate). Our newly collected data for two sites in northern Congo will be confronted to existing allometry and inventory data available elsewhere in the Congo basin to get a broader picture of allometric variations and its consequences for the estimation of biomass and carbon stocks. [less ▲]

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See detailVideo and camera traps to investigate animal ecophysiology and enhance wildlife management: case study on bees and elephants interactions in Gabon.
Ngama, Steeve ULiege; Bindelle, Jérôme ULiege; Vermeulen, Cédric ULiege

Conference (2017, August 23)

Crops are often sources of conflict between humans and wildlife. Wildlife damage to crops can drastically reduce income, amplifying poverty and creating a negative perception of wild animal conservation ... [more ▼]

Crops are often sources of conflict between humans and wildlife. Wildlife damage to crops can drastically reduce income, amplifying poverty and creating a negative perception of wild animal conservation among rural people. In this context, crop-raiding animals like elephants quickly become “problem animals”. To deter elephants from raiding crops beehives have been successfully employed in East Africa while providing honey for the farmers. Whether such a technique could work on forest elephants (Loxodonta Africana cyclotis) in Central Africa is still unknown. An ecophysiology-based trial consisting on bees and elephants interactions assessment was conducted in Gabon. It aimed to evaluate whether the presence of Apis mellifera adansonii, the African honey bee species present in Central Africa, deters forest elephants from feeding on experimental wild fruit trees. We suspected that bee physiology matters on bee defensive behavior and monitoring it through measuring bee activities can help better understand bees and elephants interactions. For this purpose video cameras were used to record activities of bees in fourteen beehives hung on seven wild trees (4 Irvingia gabonensis and 3 Sacoglottis gabonensis trees) each equipped with a camera trap to record elephants feeding behaviors on those trees. This experimental apparatus was monitored during 70 consecutive weeks from 2012 to 2013. We captured 8151 photos representing 4h31min42s of time spent by elephants at experimental trees and more than 75 videos of bees activities from where we extracted genuine results. Our results show a significant correlation between the effectiveness of beehives as deterrents of elephants and bee activity. Although elephant disturbance of hives does not inhibit honey production, there is a tradeoff between deterrence and the quantity of honey produced. More interestingly, to best achieve the dual goals of deterring elephants and producing honey colonies must maintain an optimum activity level of 40 to 60 bee movements per minute. Thus Apis mellifera adansonii bees can effectively deter elephants but beehives must be actively managed to maintain bees’ colonies at the optimum activity level. [less ▲]

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See detailWell-defined polyvinylamine-based copolymers: synthesis by organometallic-mediated radical polymerization and use in gene transfection
Debuigne, Antoine ULiege; Dréan, Mathilde; Detrembleur, Christophe ULiege et al

Conference (2017, August 22)

Polyvinylamine (PVAm) presents valuable properties like affinity for many supports, pH responsiveness, metal binding capacity, polyelectrolytes complexation, and is used in various applications including ... [more ▼]

Polyvinylamine (PVAm) presents valuable properties like affinity for many supports, pH responsiveness, metal binding capacity, polyelectrolytes complexation, and is used in various applications including coatings, water purification or gas membrane separation. PVAm is commonly prepared by free radical polymerization of N-vinyl monomers followed by deprotection and release of the masked amino functions. However, examples of controlled synthesis of polyvinylamine-based copolymers are scarce because of the high reactivity of the propagating radicals deriving from non-conjugated N-vinyl monomers due to the lack of resonance stabilization. The present communication aims at reporting an efficient platform for producing tailor-made PVAms via organometallic-mediated radical polymerization (OMRP) of N-vinylacetamides followed by hydrolysis of the pendent amide moieties. In this case, cobalt(II) acetylacetonate was successfully used as controlling agent. The synthesis of a series of well-defined homopolymers, statistical and block copolymers with pendent primary and/or secondary amines having low dispersities, predictable molar masses and precise compositions, will be described. Finally, we will discuss the possible use of these polyvinylamine-containing copolymers as gene transfection agents. Some of them demonstrated high DNA transfection level in combination with high cell viability. [less ▲]

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See detailGroundless altruism: Why it makes sense to risk one's life for other people's money
Dumitru, Magdalena ULiege; Joergensen, Gitte

Conference (2017, August 22)

In a study where participants were asked to make a series of assessments in distinct circumstances, we show that altruistic agents may incur disadvantages in the name of values they do not believe in (i.e ... [more ▼]

In a study where participants were asked to make a series of assessments in distinct circumstances, we show that altruistic agents may incur disadvantages in the name of values they do not believe in (i.e., saving money) as long as they believe in the overarching category (e.g., it is a ‘good deed’ to recover other people’s money). Whereas previous research mostly targeted ultimate benefits (i.e., whether or not altruistic agents incur real disadvantages), the axiological basis of altruistic acts (i.e., whether or not they have the same worth to self and to others) has remained unchallenged. Here, we explored “groundless altruism” by asking participants to rate their agreement with the statement ‘Money is worth risking my life for’ before and after presenting them with an altruistic scenario. There was a dramatic increase in the proportion of ‘yes’ responses from the first to the second rating. Moreover, as predicted by the cultural group selection theory, the status of the agent (low-rank police employee v s. secret agent) was largely irrelevant. These findings suggest that social constructs such as categorisation have the potential to significantly influence human behaviour in various domains from moral psychology to work ethics to language learning. [less ▲]

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See detailGestion de la biodiversité
Monty, Arnaud ULiege

Conference (2017, August 21)

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See detailNarrative Misappropriations of Pokémon: How Fanarts and Fanfictions Playfully Feed and Reconfigure a Transmedia Universe
Barnabé, Fanny ULiege

Conference (2017, August 21)

As defined by Jenkins (2006), transmedia storytelling is intimately linked with creative practices of reception which take part in what we now call the “participatory culture” (Raessens, 2005; Jenkins ... [more ▼]

As defined by Jenkins (2006), transmedia storytelling is intimately linked with creative practices of reception which take part in what we now call the “participatory culture” (Raessens, 2005; Jenkins, 1992 and 2009). The audience plays, indeed, a key role in the construction of transmedia universes, given that “to fully experience any fictional world, consumers must assume the role of hunters and gatherers, chasing down bits of the story across media channels, comparing notes with each other via online discussion groups, and collaborating to ensure that everyone who invests time and effort will come away with a richer entertainment experience” (Jenkins, 2006: 21). Consequently, studying a media – in this case, the video game – through the lens of transmedia storytelling urges one to take into consideration how the public can participate, feed, or transform fictions by consuming them. Furthermore, in the field of game studies, it is all the more relevant to deal with the implication of players in the creative process since video games are historically and structurally related to the practice of misappropriation or detournement. As Genvo notes: “the creation of the first video game [Spacewar, 1962] already resulted from a playful act, which was expressed by the misuse of the conventional function of an MIT’s super calculator” (Genvo, 2008: 2). This original affinity now appears in a number of creative practices that prolong the game outside its primary space and enable it to seep into other medias: as fanfictions, modding or machinimas show, the video game is regularly apprehended by players not as a closed work to consume, but “more as [a] suit[e] of resources to be played with” (Newman, 2012: 123). This paper therefore seeks to study the impact of players’ misappropriations on the development of video games' fictional worlds. In this perspective, I will focus on a deeply transmedia license, the Pokémon saga, and on two creative practices that reconfigure games’ universes: fanarts and fanfictions. While amateur drawings and comics inspired by Pokémon GO have created narrative extensions from scratch about the barely characterized Team Leaders (Blanche, Candela and Spark), fan-authors have written thousands of texts that play with elements of the Pokémon universe in order to produce original stories. Yet, these textual and pictorial rewritings do not merely reuse narrative elements of Pokémon games; they also feature strictly playful components such as gameplay, glitches or actions like saving and reloading, which then become new types of narrative motifs. Fanfictions and fanarts thus construct – like the games they extend – hybrid fictions, mixing storytelling and gaming logic: in Amato’s words, “ludiegesis” (Amato, 2005 : 301). Using theoretical tools from narratology and from game studies, I will show that, by reincorporating playful aspects in their narrative structures, these derivative works hold a reflexive discourse on the original game that cannot be reduced to a binary opposition between “adhesion” and “subversion”, but which builds a whole new stratum of fiction. [less ▲]

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See detailLandscape and hydrological controls on the downstream transport of dissolved organic matter in the Congo and Zambezi rivers
Lambert, T; Bouillon, S; Teodoru, CR et al

Conference (2017, August 20)

Detailed reference viewed: 20 (2 ULiège)
See detailConstruction of high-resolution trace element time-series in Belgian speleothems by LA-ICP-MS
Allan, Mohammed ULiege; 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 detailEnhancing CIDOC - CRM and compatible models with the concept of multiple interpretation
Van Ruymbeke, Muriel ULiege; Hallot, Pierre ULiege; Billen, Roland ULiege

in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences (2017, August 17), Volume IV-2/W2

Modelling cultural heritage and archaeological objects is used as much for management as for research purposes. To ensure the sustainable benefit of digital data, models benefit from taking the data ... [more ▼]

Modelling cultural heritage and archaeological objects is used as much for management as for research purposes. To ensure the sustainable benefit of digital data, models benefit from taking the data specificities of historical and archaeological domains into account. Starting from a conceptual model tailored to storing these specificities, we present, in this paper, an extended mapping to CIDOC-CRM and its compatible models. Offering an ideal framework to structure and highlight the best modelling practices, these ontologies are essentially dedicated to storing semantic data which provides information about cultural heritage objects. Based on this standard, our proposal focuses on multiple interpretation and sequential reality. [less ▲]

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

Poster (2017, August 16)

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See detailPOINT CLOUD CLASSIFICATION OF TESSERAE FROM TERRESTRIAL LASER DATA COMBINED WITH DENSE IMAGE MATCHING FOR ARCHAEOLOGICAL INFORMATION EXTRACTION
Poux, Florent ULiege; Neuville, Romain ULiege; Hallot, Pierre ULiege et al

in ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences (2017, August 16), IV-2/W2

Reasoning from information extraction given by point cloud data mining allows contextual adaptation and fast decision making. However, to achieve this perceptive level, a point cloud must be semantically ... [more ▼]

Reasoning from information extraction given by point cloud data mining allows contextual adaptation and fast decision making. However, to achieve this perceptive level, a point cloud must be semantically rich, retaining relevant information for the end user. This paper presents an automatic knowledge-based method for pre-processing multi-sensory data and classifying a hybrid point cloud from both terrestrial laser scanning and dense image matching. Using 18 features including sensor’s biased data, each tessera in the high-density point cloud from the 3D captured complex mosaics of Germigny-des-prés (France) is segmented via a colour multi-scale abstraction-based featuring extracting connectivity. A 2D surface and outline polygon of each tessera is generated by a RANSAC plane extraction and convex hull fitting. Knowledge is then used to classify every tesserae based on their size, surface, shape, material properties and their neighbour’s class. The detection and semantic enrichment method shows promising results of 94% correct semantization, a first step toward the creation of an archaeological smart point cloud. [less ▲]

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See detailMagma storage conditions and processes at Calbuco volcano (Central Southern Volcanic Zone, Chile)
Montalbano, Salvatrice ULiege; Namur, Olivier ULiege; Schiano, Pierre et al

Poster (2017, August 16)

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See detailVisible-light TiO2 photocatalyst doped with silylated porphyrin
Mahy, Julien ULiege; Pàez Martinez, Carlos ULiege; Léonard, Géraldine ULiege et al

Conference (2017, August 15)

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See detailIn vitro evaluation of the competing effect of Carnobacterium maltaromaticum isolated from vacuum packed meat against food pathogens
Maia Danielski, Gabriela ULiege; Didimo Imazaki, Pedro Henrique ULiege; Daube, Georges ULiege et al

Conference (2017, August 15)

Foodborne disease outbreaks are one of the leading causes of infections, hospitalizations and deaths provoked by pathogenic bacteria including Escherichia coli O157:H7, Listeria monocytogenes and ... [more ▼]

Foodborne disease outbreaks are one of the leading causes of infections, hospitalizations and deaths provoked by pathogenic bacteria including Escherichia coli O157:H7, Listeria monocytogenes and Salmonella spp. Carnobacterium maltaromaticum is a lactic acid bacteria, which could prevent the growth of pathogens in refrigerated food. The aim of this study was to determine the bioprotective potential of three strains of C. maltaromaticum isolated from chilled vacuum packed beef. They were tested in vitro against the pathogens described above. The results indicate that the selected strains have an antilisterial activity, which is optimized at low temperatures. Moreover, when the strains were combined with EDTA it was observed a slight, but significant, inhibition of the gram-negative bacteria used in this study. [less ▲]

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

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 detailA novel approach towards manipulation of vortex matter in a superconductor with micromagnetic structures
Shaw, Gorky ULiege

Poster (2017, August 10)

Hard permanent magnetic materials offer a number of advantages over softer magnetic materials as sources of vortex pinning in a superconductor, like greater stability and larger magnetic field amplitudes ... [more ▼]

Hard permanent magnetic materials offer a number of advantages over softer magnetic materials as sources of vortex pinning in a superconductor, like greater stability and larger magnetic field amplitudes. Permanent micromagnet structures prepared using thermomagnetic patterning (TMP) present an interesting and so far unexplored option for controlled artificial pinning. We have investigated the vortex matter in superconductor/TMP micromagnet heterostructures (Nb-NdFeB) using quantitative Magneto-Optical Imaging (MOI). Comprehensive protocols have been developed for calibrating and converting Faraday rotation data acquired by MOI to magnetic field maps. These protocols reveal the comparatively weaker magnetic response of the superconductor from the background of larger fields associated with the magnetic layer in its vicinity. Further, TMP micromagnet structures have been imprinted in a Permalloy (Py) layer to obtain flexible magnetic landscapes for flux guidance in a Nb layer below it. Both smooth flux penetration and vortex avalanches in Nb are observed to be strongly influenced by the micromagnetic patterns. Our study offers new insights into the peculiarities of the vortex state in these superconductor-micromagnet heterostructures. [less ▲]

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See detailTailoring the superconducting properties of niobium nanoconstrictions via electro-annealing
Lombardo, Joseph ULiege; Baumans, Xavier ULiege; Jelic, Zeljko ULiege et al

Poster (2017, August 10)

In this work we report the possibility to create weak links in nanostructured Nb thin films using electro-annealing. By using electron-assisted atom diffusion in Nb nanconstrictions, we were able to ... [more ▼]

In this work we report the possibility to create weak links in nanostructured Nb thin films using electro-annealing. By using electron-assisted atom diffusion in Nb nanconstrictions, we were able to locally change the material properties (superconducting critical temperature and normal resistance). When the critical temperature of the nanoconstriction is sufficiently decreased, the field dependence of the critical current exhibits a Fraunhofer-like pattern, confirming the formation of the weak link. Scanning electron microscopy images clearly reveals the structural change underwent by the constriction resulting from the effect of the high current density. Numerical simulations within the Ginzburg-Landau formalism are also presented. These findings represent the first evidence of weak link formation by electro-annealing and provide an easy method for the fabrication of Josephson junctions with tunable resistance and critical temperature in Nb thin films. [less ▲]

Detailed reference viewed: 25 (3 ULiège)
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See detailORBi : an institutional repository to promote Open Access
Chalono, Dominique ULiege; Thirion, Paul ULiege

Conference (2017, August 09)

Since 2008 the University of Liège as implemented an institutional repository - ORBi - based on a strong mandate. Every member of the ULiège must upload the bibliographic references of all of his/hers ... [more ▼]

Since 2008 the University of Liège as implemented an institutional repository - ORBi - based on a strong mandate. Every member of the ULiège must upload the bibliographic references of all of his/hers scientific publications and communications. The deposit of full text is also mandatory for scientific articles published since 2002. The internal evaluation at ULiège will only take into account publications deposited in ORBi. More than a repository, ORBi has become a tool to develop and inform on the concept of Open Science and Open access by allowing researchers to be part of the movement and to actively participate in the diffusion of their own production. By demanding authors to check by themselves the publisher’s policies and author’s copyright, ORBi has contributed to raise awareness on the unfair practices of big publishers. It has also demonstrated the need to rebalance a publication model that is no longer affordable by those who produce the main information. Additional tools developed by the ORBi team (statistics, request-a- print system, automated publications list) also help to give substance to the many benefices of open access (increase of citations, visibility, contacts and connections). [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 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 ULiege 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 ULiege

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 ULiege

Conference (2017, August 03)

PhD project presentation

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

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 ULiege

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 detailRegularized Discriminant Analysis in Presence of Cellwise Contamination
Aerts, Stéphanie ULiege; Wilms, Ines

Conference (2017, August 01)

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are more ... [more ▼]

Quadratic and Linear Discriminant Analysis (QDA/LDA) are the most often applied classification rules under normality. In QDA, a separate covariance matrix is estimated for each group. If there are more variables than observations in the groups, the usual estimates are singular and cannot be used anymore. Assuming homoscedasticity, as in LDA, reduces the number of parameters to estimate. This rather strong assumption is however rarely verified in practice. Regularized discriminant techniques that are computable in high-dimension and cover the path between the two extremes QDA and LDA have been proposed in the literature. However, these procedures rely on sample covariance matrices. As such, they become inappropriate in presence of cellwise outliers, a type of outliers that is very likely to occur in high-dimensional datasets. We propose cellwise robust counterparts of these regularized discriminant techniques by inserting cellwise robust covariance matrices. Our methodology results in a family of discriminant methods that are robust against outlying cells, cover the gap between LDA and QDA and are computable in high-dimension. [less ▲]

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See detailImpact of dependency on the distribution of p-value
Ernst, Marie ULiege; Swan, Yvik ULiege

Conference (2017, August 01)

We study the impact of dependence assumptions on the distribution of p-values and quantiles for repeated testing on dependent data. This leads us to considering the general problem of the quality of a ... [more ▼]

We study the impact of dependence assumptions on the distribution of p-values and quantiles for repeated testing on dependent data. This leads us to considering the general problem of the quality of a binomial approximation to the distribution of a sum of dependent indicator variables. Whenever possible we use classical and adhoc versions of Stein’s method to provide tight bounds on classical probability distances. In many cases, however, the relevant expressions are intractable and we resort to empirical analysis by extensive simulations. We apply our findings to a realistic real-life scenario. [less ▲]

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See detailInfluence of urban patterns on flooding
Bruwier, Martin ULiege; 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 detailAssessing quality of life using structural equation modeling
Dardenne, Nadia ULiege; Pétré, Benoît ULiege; Husson, Eddy ULiege et al

Poster (2017, August)

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

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 and other processes. [less ▲]

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See detailNUMERICAL STUDY OF TURBULENT OSCILLATIONS AROUND A CYLINDER: RANS CAPABILITIES AND SENSITIVITY ANALYSIS
Valero Huerta, Daniel ULiege; Bung, Daniel B.; Erpicum, Sébastien ULiege et al

in Proceedings of the 37th IAHR World Congress (2017, August)

Numerical modelling is commonly used in a large range of environmental fluid mechanics applications. It has become widely accepted and, with increasing computer power, the employed models are increasing ... [more ▼]

Numerical modelling is commonly used in a large range of environmental fluid mechanics applications. It has become widely accepted and, with increasing computer power, the employed models are increasing also in complexity. Reynolds Averaged Navier-Stokes (RANS) equations are the preferred approach for 3D problems, being especially suited for the computation of the mean flow. However, little is known about RANS performance for the fluctuating quantities; being reasonable to expect an impairment in the accuracy. In this study, a simple geometry (cylindrical pier) is subject to different numerical settings in order to assess their effect on the development of the physically based flow instabilities. Mesh refinement has shown to enhance the perturbation growth rate while maximum CFL value has not produced any effect. RNG k-ϵ and k-ω have shown to be more dissipative than k-ϵ. Some advection schemes seem to increase the spurious perturbation converging to the physically based ones. Finally, introducing an experimentally based perturbation at the inlet has proven to speed up the process. [less ▲]

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See detailFLOWCV - AN OPEN-SOURCE TOOLBOX FOR COMPUTER VISION APPLICATIONS IN TURBULENT FLOWS
Bung, Daniel B.; Valero Huerta, Daniel ULiege

in Proceedings of the 37th IAHR World Congress (2017, August)

Despite the continuous advances in numerical modeling methods and the continuous increase of computer power and storage capacities in the last decades, physical modeling remains a common technique for ... [more ▼]

Despite the continuous advances in numerical modeling methods and the continuous increase of computer power and storage capacities in the last decades, physical modeling remains a common technique for evaluation of flow processes. One major advantage of this classical approach is given by the transparency of experiments as the flow can be easily observed in the laboratory and effects of changing boundary conditions may be better understood. Nowadays, the flow is commonly captured in most experiments with means of digital cameras or high-speed cameras to get a better insight and for further analyses after the model test. Besides some well-known techniques, such Particle Image Velocimetry, some new methods can be found in Computer Vision disciplines allowing for more detailed investigation of the images. This paper presents two modules of the new open-source toolbox FlowCV which has been developed to be applied in hydraulic laboratories. The first module is given by a synthetic particle image generator which provides the user with particle images of a predefined motion and turbulence. The second module implements different Optical Flow methods for determination of obstacle movement (here: particle movement). The Farnebäck method, which is presented in this paper, gives dense velocity fields, i.e. velocity data for every image pixel. The Optical Flow results based on the synthetic images are then benchmarked against their predefined particle velocity. It will be shown that even smallest turbulent flow structures are adequately detected. [less ▲]

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See detailVoice use among music theory teachers
Schiller, Isabel ULiege; Morsomme, Dominique ULiege; 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 detailPrevalence of voice disorders among teachers at the beginning of their career
Schiller, Isabel ULiege

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 detailAn efficient algorithm to decide periodicity of b-recognisable sets using MSDF convention
Boigelot, Bernard ULiege; Mainz, Isabelle ULiege; Marsault, Victor ULiege 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 ULiege; Beghin, Jérémie ULiege; Kabamba Baludikay, Blaise ULiege et al

in Goldschmidt Abstracts, 2017 (2017, August)

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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 ULiege; Archambeau, Pierre ULiege 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 detailLEARNING CHEMICAL KINETICS AT SECONDARY SCHOOL LEVEL: MISCONCEPTIONS AND ALTERNATIVE APPROACH
Karous, Hamad ULiege; Nihant, Brigitte ULiege; Leyh, Bernard ULiege

Conference (2017, August)

Chemical kinetics occupies a central position in describing and understanding the dynamic behaviour of matter. It is then expected that this topic shares a significant part in the teaching curricula ... [more ▼]

Chemical kinetics occupies a central position in describing and understanding the dynamic behaviour of matter. It is then expected that this topic shares a significant part in the teaching curricula. Nevertheless, the review of the scarce literature on the topic reveals that little is usually invested to adequately include this field in the major programs. Most studies demonstrate that the teaching approaches in chemical kinetics often remain limited to the qualitative macroscopic description and do not identify the necessary relevant links between the macroscopic and the submicroscopic scales. Consequently, low levels of conceptual understanding and many misconceptions can be identified at the students’ level. Based on the constructivist approach in which the learners build their own cognitive structure, a new teaching sequence including qualitative and quantitative aspects of chemical kinetics for secondary school students (15-17 years old) is proposed. This teaching sequence allows the students to develop an ability to use corpuscular models as explanatory tools as well as an adequate conceptual understanding of chemical kinetics. This approach integrates visualization tools along with active learning strategies using, e.g., interactive websites. [less ▲]

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See detailLe vocabulaire des archives des cités grecques : l’apport de l’épigraphie. Le cas des termes ἀποδέκτης et ἀποδοχεύς
Dolne, Laëtitia ULiege

Poster (2017, August)

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un ... [more ▼]

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un des objectifs du projet est de réaliser un lexique systématique, exhaustif et raisonné, fondé sur une analyse approfondie et contextualisée des sources littéraires, épigraphiques et papyrologiques grecques et latines de c. IIIe s. av. J.-C. à c. IIIe s. apr. J.-C. Une fois achevé, le lexique facilitera pour tous l’accès aux sources de l’activité archivistique ancienne et, de ce fait, sa compréhension et son étude dans un cadre plus global. En effet, la lecture de ces sources est entravée par la diversité et la technicité des termes qui y abondent et peuvent avoir, selon le contexte, mais aussi le lieu et l’époque, des acceptions différentes, et donc désigner des réalités distinctes. Le poster illustre cette problématique, ainsi que la méthodologie employée dans le projet, par l’exemple des termes ἀποδέκτης et ἀποδοχεύς. Alimenté principalement par la documentation épigraphique, le cas de figure choisi montre également l’important apport de cette discipline pour la réalisation d’un tel lexique. [less ▲]

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See detailNETPerfTrace – Predicting Internet Path Dynamics and Performance with Machine Learning
Wassermann, Sarah ULiege; Casas, Pedro; Cuvelier, Thibaut ULiege 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 detailDesign and Synthesis of [18F]BPAM121, a PET-Probe Targeting AMPA-subtype Glutamatergic Receptors.
Manos-Turvey, Alexandra ULiege; Lemaire, Christian ULiege; Becker, Guillaume ULiege et al

Poster (2017, August)

AMPA receptors (AMPARs), one of three sub-groups of ionotropic glutamate receptors present in the central nervous system, are recognised for their involvement in long-term potentiation (LTP), and learning ... [more ▼]

AMPA receptors (AMPARs), one of three sub-groups of ionotropic glutamate receptors present in the central nervous system, are recognised for their involvement in long-term potentiation (LTP), and learning and memory processes. [1] They represent a valid cognitive enhancer target, particularly in the fight against Alzheimer’s disease (AD). [2,3] Benzothiadiazine 1,1-dioxides, such as BPAM121, have emerged as important allosteric modulators of AMPARs, working solely in the presence of the endogenous transmitter. [4] Synthesis of BPAM121 labelled with fluorine-18 was proposed, to investigate the utility of this molecule as a PET probe in vivo, and evaluate its potential as an AD diagnostic tool (Figure 1). [Figure 1. a) Structure of BPAM121, b) Established radiochemical synthesis of [18F]BPAM121.] This work documents the successful optimization of synthesis, purification and formulation of [18F]BPAM121 using an automated FASTlab (GE Healthcare) synthesizer. In particular, the influence of higher-level [18F]fluoride ion starting concentrations on final product formulation requirements is discussed. Initial results revealed [18F]BPAM121 successfully passes the blood brain barrier, and further biological studies are currently underway. References [1] S. F. Traynelis et al. Pharmacol. Rev. 2010, 62, 405-496. 
 [2] J. Keifer, Z. Zheng, Eur. J. Neurosci. 2010, 32, 269-277. 
 [3] L. Gao et al. J. Neurochem. 2016, 136, 620-636. 
 [4] P. Francotte et al. J. Med. Chem. 2010, 53, 1700-1711. 
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See detailEvaluation of two intravaginal implants for the synchronization of estrus in Criollo cattle in Peru
Ordonez, Cesar; Ampuero, Enrique; Huanca, Nancy et al

Poster (2017, August)

The objective of this study was to compare the effect of two vaginal implants protocols on the follicular characteristics, the vaginal electrical resistance and the pregnancy rate of criollo cattle reared ... [more ▼]

The objective of this study was to compare the effect of two vaginal implants protocols on the follicular characteristics, the vaginal electrical resistance and the pregnancy rate of criollo cattle reared in altitude (3100 meters). All the cows (n=53) were selected after manual palpation and ultrasound examinations of their genital tract. All the cows had a body condition between 2.5 and 3.5 (range 1 to 5). On day 1 et for 7 days the first group of cows (n=23) was treated with 1,38 g of progesterone (Easi-breedTM CIDR® Zoetis) and the second group (n=30) with 1 g of progesterone (DIB system Agrihealth New Zealand). All the cows were treated at day 1 with 2 mg of estradiol benzoate (im), at day 9 with 2 ml of prostaglandin (im) and at day 10 with 1 mg of estradiol benzoate. A timed artificial insemination was realized 54 hours after the CIDR® or DIB removal. The pregnancy diagnosis was made by ultrasound 45 days later. Vaginal conductivity, diameter and perimeter of the follicle were measured at the time of insemination. There were no significant differences (p> 0.05) between both treatments in the electrical resistance of the vaginal mucus, diameter and perimeter of the preovulatory follicule. The averages of these variables respectively were 233 ± 36 ohms, 9.1 ± 1.9 mm and 24.6 ± 4.7 mm. Pregnancy rates of cows treated with DIB and CIDR respectively were 63.3 % and 69.6%. No significant statistical differences (p> 0.05) have been seen. In conclusion, both treatments showed similar ovarian response, electrical resistance and pregnancy rate in criollo cattle reared in altitude. [less ▲]

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

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 detailForeseeing New Control Challenges in Electricity Prosumer Communities
Olivier, Frédéric ULiege; Marulli, Daniele; Ernst, Damien ULiege 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 detailDynamicized semantic maps of content words. Comparing long-term lexical changes in Ancient Egyptian and Greek
Georgakopoulos, Athanasios ULiege; Polis, Stéphane ULiege

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 detailLegal, official, academic and "trading" norms in higher DRC's education
Poncelet, Marc ULiege

Conference (2017, July 31)

Rule of legal, official, practical norms in DRC university

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

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 detailThermoelectric properties of heavily-doped Fe2YZ full-Heusler compounds
Lemal, Sébastien ULiege; Ricci, Fabio ULiege; Verstraete, Matthieu ULiege et al

Poster (2017, July 31)

Fe2YZ full-Heusler compounds were recently predicted to exhibit very large thermoelectric power factors [Phys. Rev. Lett. 114, 136601 (2015)]. Combining first-principles density functional theory ... [more ▼]

Fe2YZ full-Heusler compounds were recently predicted to exhibit very large thermoelectric power factors [Phys. Rev. Lett. 114, 136601 (2015)]. Combining first-principles density functional theory calculations within a hybrid functional approach and Boltzmann semi-classical transport theory, we investigate the limits of the rigid band doping approximation, and the properties of heavily n-type doped full-Heusler Fe2YZ1-xAx compounds. Using a supercell approach and including explicit dopant impurities, we recover in some cases giant thermoelectric power factors, as previously predicted within the rigid band approximation. In others the effect on the electronic structure is very different from rigid shifts. Interestingly, we find that some systems present a magnetic instability consistent with the Stoner model, and evolve towards a ferromagnetic half-metallic ground state, with a strongly modified power factor. Our results show the promise of the heavily-doped phases of the studied Fe2YZ1-xAx compounds for Seebeck and spin-dependent Seebeck applications. [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 ULiege

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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