Last 7 days
Bookmark and Share    
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 ▲]

Detailed reference viewed: 35 (3 ULiège)
Full Text
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 ▲]

Detailed reference viewed: 30 (4 ULiège)
Full Text
See detailL'autonomie de la volonté dans les relations familiales internationales
Wautelet, Patrick ULiege; Fulchiron, Hugues; Panet, Amélie

Book published by Bruylant (2017)

Les règlements de l’Union européenne adoptés dans le domaine du droit international privé laissent une place de plus en plus importante à la volonté des parties dans le règlement des litiges ... [more ▼]

Les règlements de l’Union européenne adoptés dans le domaine du droit international privé laissent une place de plus en plus importante à la volonté des parties dans le règlement des litiges transfrontières. Phénomène généralisé du droit international privé contemporain, l’autonomie de la volonté s’accroît dans un domaine qui lui était traditionnellement étranger : le domaine du droit de la famille, entendu au sens large (droit patrimonial et extra patrimonial). L’essor de l’autonomie de la volonté en droit de l’Union européenne soulève de nombreuses questions : quel doit être aujourd’hui le domaine de l’autonomie de la volonté ? Comment confronter l’autonomie de la volonté avec les lois de police ? Quelle place faut-il accorder aux ordres publics nationaux ? Quel rôle doivent jouer les droits fondamentaux (moteur ou limite) ? Au-delà de ces questions théoriques, l’ouvrage tente également de répondre aux interrogations pratiques : comment les avocats et les notaires peuvent-ils aider leurs clients à mettre en œuvre l’autonomie de la volonté que leur concède l’Union européenne ? Qu’implique aujourd’hui leur devoir de conseil ? Confrontés à une clause de choix de loi en matière familiale, ou peut-être demain, à une clause d’élection de for, quels doivent être les réflexes des magistrats ? [less ▲]

Detailed reference viewed: 35 (0 ULiège)
Full Text
Peer Reviewed
See detailA two-step methodology for human pose estimation increasing the accuracy and reducing the amount of learning samples dramatically
Azrour, Samir ULiege; Pierard, Sébastien ULiege; Geurts, Pierre ULiege et al

in Advanced Concepts for Intelligent Vision Systems (2017, September)

In this paper, we present a two-step methodology to improve existing human pose estimation methods from a single depth image. Instead of learning the direct mapping from the depth image to the 3D pose, we ... [more ▼]

In this paper, we present a two-step methodology to improve existing human pose estimation methods from a single depth image. Instead of learning the direct mapping from the depth image to the 3D pose, we first estimate the orientation of the standing person seen by the camera and then use this information to dynamically select a pose estimation model suited for this particular orientation. We evaluated our method on a public dataset of realistic depth images with precise ground truth joints location. Our experiments show that our method decreases the error of a state-of-the-art pose estimation method by 30%, or reduces the size of the needed learning set by a factor larger than 10. [less ▲]

Detailed reference viewed: 51 (8 ULiège)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 19 (1 ULiège)
Full Text
Peer Reviewed
See detailLa carte conceptuelle en séance collective d'éducation thérapeutique du patient : quelles condirtions d'utilisation et quels effets ?
Yvon Divré, Anthony; Leclercq, Dieudonné ULiege; Marchand, Claire

in Education Thérapeutique du Patient [=ETP] = Therapeutic Patient Education [=TPE] (2017), 9(10103),

Résumé - Introduction : A l’origine, les cartes conceptuelles ont été conçues pour faciliter l’apprentissage des étudiants en les aidant à organiser leurs connaissances sous la forme de schémas. Or, dans ... [more ▼]

Résumé - Introduction : A l’origine, les cartes conceptuelles ont été conçues pour faciliter l’apprentissage des étudiants en les aidant à organiser leurs connaissances sous la forme de schémas. Or, dans le domaine de l’ETP, elles sont principalement utilisées dans un but d’évaluation pour un diagnostic éducatif ou en fin d’éducation, et moins souvent comme technique d’aide à l’apprentissage. Objectifs : L’étude vise à : (1) évaluer les effets d’un mode d’utilisation des cartes conceptuelles, en petit groupes et en pratique courante ; (2) à partir des données, réfléchir aux conditions qui pourraient faciliter ou limiter leur utilisation. Méthodes : Sept groupes de maximum 5 patients ont bénéficié d’une séance d’une durée d’une heure selon la méthode habituelle (N=30) et sept autres groupes avec la technique de la carte conceptuelle (N=29). Les connaissances des patients ont été évaluées avant (PRE) et le lendemain de la séance (POST) à l’aide d’un test qui comportait 30 questions Vrai-Faux avec degrés de certitude (15 questions de connaissance, 6 de jugement portant sur des menus et 9 relevant de 3 mini situations problèmes requérant des décisions). La satisfaction des patients a été évaluée par questionnaire et la perception des animatrices par l’utilisation d’un journal de bord et lors d’un entretien collectif. Résultats : Le pourcentage de Réponses Correctes (%RC) au test a augmenté dans les deux ensembles de groupes (gain 5%, gain relatif 17,6%) sans différence statistiquement significative (à P.05) entre les deux ensembles. Les gains sont plus importants pour les questions de connaissance (gain relatif 28,8%) que pour celles sur les situations problèmes (14,4%) et sur les menus (2,8%). Les degrés de certitude mettent en évidence que les réponses nuisibles (erreurs avec certitude élevée), aux alentours de 20% au départ, n’ont pas régressé au post-test. Diverses hypothèses sont avancées pour expliquer ces résultats. Les taux de satisfaction des patients vis-à-vis de la séance d’éducation sont supérieurs à 89% quelle que soit la méthode utilisée. Les groupes animés avec la carte conceptuelle ainsi que les animatrices ont souligné l’intérêt de celle-ci pour hiérarchiser et clarifier les connaissances. La qualité de la formation à la technique des cartes conceptuelles constitue une des principales conditions pour leur utilisation. Conclusion : Des principes sont proposés pour guider de nouvelles recherches destinées à vérifier dans quelles conditions l’utilisation de la carte conceptuelle comme technique pédagogique en ETP améliore la capacité de résolution de problème. [less ▲]

Detailed reference viewed: 38 (4 ULiège)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 33 (4 ULiège)
Full Text
See detailTargeted mutagenesis of orphan GPCRs of the SREB family
Laschet, Céline ULiege; Dupuis, Nadine ULiege; Geubelle, Pierre ULiege et al

Poster (2017, September)

Detailed reference viewed: 20 (5 ULiège)
Full Text
Peer Reviewed
See detailL’EXPRESSION DES CONVICTIONS RELIGIEUSES DANS LES RELATIONS DE TRAVAIL
Kéfer, Fabienne ULiege

in Revue de Droit Social = Tijdschrift voor Sociaal Recht (2017), (3), 527-583

This article explores the way in which Belgian law deals with situations where labour law engages with the right to freedom of religion and belief and the right not to be discriminated on grounds of ... [more ▼]

This article explores the way in which Belgian law deals with situations where labour law engages with the right to freedom of religion and belief and the right not to be discriminated on grounds of religion. It starts with the Belgian regime of religious freedom, protection against discrimination and valid reasons for termination of employment. It then considers specific areas of those regimes in Belgian labour relations, such as the work schedule accommodation, the refusal to perform work, clothing and religious symbols in the workplace, and the work in an ethos organization. It relates mainly to Belgian case law but also to the case law of the European courts. [less ▲]

Detailed reference viewed: 25 (5 ULiège)
Full Text
Peer Reviewed
See detailLexical Diachronic Semantic Maps
Georgakopoulos, Athanasios ULiege; Polis, Stéphane ULiege

Poster (2017, September)

Detailed reference viewed: 21 (2 ULiège)
See detailOù sont les femmes? La féminisation à l'Université de Liège
Dor, Juliette ULiege; Gavray, Claire ULiege; Henneau, Marie-Elisabeth ULiege et al

Book published by Presses universitaires de Liège (2017)

Une première partie est consacrée aux étapes d'arrivée des pionnières à l'Université et aux débats qui ont eu lieu à propos de cette question. Une autre partie est consacrée à des témoignages de femmes ... [more ▼]

Une première partie est consacrée aux étapes d'arrivée des pionnières à l'Université et aux débats qui ont eu lieu à propos de cette question. Une autre partie est consacrée à des témoignages de femmes liées à l'Université parce qu'elles y ont étudié, travaillé, parce qu'elles y exercent des responsabilités. Le contenu de ces témoignages fait l'objet d'analyses. [less ▲]

Detailed reference viewed: 80 (17 ULiège)
Full Text
Peer Reviewed
See detailSemantic Background Subtraction
Braham, Marc ULiege; Pierard, Sébastien ULiege; Van Droogenbroeck, Marc ULiege

in IEEE International Conference on Image Processing (ICIP), Beijing 17-20 September 2017 (2017, September)

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety ... [more ▼]

We introduce the notion of semantic background subtraction, a novel framework for motion detection in video sequences. The key innovation consists to leverage object-level semantics to address the variety of challenging scenarios for background subtraction. Our framework combines the information of a semantic segmentation algorithm, expressed by a probability for each pixel, with the output of any background subtraction algorithm to reduce false positive detections produced by illumination changes, dynamic backgrounds, strong shadows, and ghosts. In addition, it maintains a fully semantic background model to improve the detection of camouflaged foreground objects. Experiments led on the CDNet dataset show that we managed to improve, significantly, almost all background subtraction algorithms of the CDNet leaderboard, and reduce the mean overall error rate of all the 34 algorithms (resp. of the best 5 algorithms) by roughly 50% (resp. 20%). Note that a C++ implementation of the framework is available at http://www.telecom.ulg.ac.be/semantic. [less ▲]

Detailed reference viewed: 288 (74 ULiège)
See detailDirecteur de prison: l'homme-orchestre
Dubois, Christophe ULiege

Article for general public (2017)

Detailed reference viewed: 21 (0 ULiège)
Full Text
Peer Reviewed
See detailNumerical analysis of the fire resistance of high-strength steel circular columns
Tondini, Nicolas; Demonceau, Jean-François ULiege

in Proceeding of Eurosteel 2017 conference (2017, September)

High strength steels (HSS) have specific chemical compositions, which primarily depend on rolling tempering techniques, element thickness and the producer. Nonetheless, EN1993-1-12 related to HSS up to ... [more ▼]

High strength steels (HSS) have specific chemical compositions, which primarily depend on rolling tempering techniques, element thickness and the producer. Nonetheless, EN1993-1-12 related to HSS up to S700 grade does not provide any additional note on the design of steel structures subjected to fire and the designer is referred to EN1993-1-2 valid up to S460 grade. This paper presents the results of a numerical analysis on the behaviour at elevated temperature of Circular Hollow Sections (CHS) columns made of HSS. In details, three full-scale HSS CHS columns with average measured yield strength of 822 MPa and 3.15 m long were tested under the standard ISO fire with constant eccentric compression load. Two members were made of a cross section 323.9 mm x 10 mm and one of a cross section 355.6 mm x 12 mm. The constant applied loads during the tests were respectively equal to 10%, 14% and 19% of the axial capacity of the columns at ambient temperature. Then, a nonlinear thermomechanical finite element model made of solid elements was developed by means of ABAQUS. A fully-coupled analysis using Geometrically and Materially Nonlinear Imperfect Analysis (GMNIA) was employed meaning that the temperature field was determined together with the stress-displacement fields. The calibration of the numerical model was carried out against experimental data by exploiting the thermal and the mechanical properties of steel provided in EN1993-1-2. A sensitivity analysis was performed to highlight the main parameters that affect the simulation results, i.e. mesh size, residual stresses, geometrical imperfections etc. The calibration process showed a good agreement between the numerical results and the experimental outcomes both in terms of failure temperature and of failure mode. With the calibrated model, it was finally possible to perform a preliminary parametric analysis by varying the applied load and the column relative slenderness to assess the appropriateness of the buckling curve included in EN1993 -1-2 to predict the fire resistance of HSS CHS columns. [less ▲]

Detailed reference viewed: 23 (2 ULiège)
Full Text
Peer Reviewed
See detailInfluence of beam-to-column joints on the robustness of earthquake-resistant moment-resistant frames
Francavilla, Antonella; Latour, Massimo; Rizzano, Gianvittorio et al

in Proceeding of Eurosteel 2017 conference (2017, September)

Robustness of Moment Resistant Frames (MRFs) designed according to current seismic codes and subjected to a loss-of-column scenario is strictly linked to the deformation capacity of beam-to-column ... [more ▼]

Robustness of Moment Resistant Frames (MRFs) designed according to current seismic codes and subjected to a loss-of-column scenario is strictly linked to the deformation capacity of beam-to-column connections, which are usually subjected to combined axial and bending loads. In the seismic design of steel frames, once avoided the yielding of columns, a global dissipative collapse mechanism has to be ensured by imposing the formation of plastic hinges at the ends of the beams or in the connections and guarantying, provided that the elements involved in plastic range have an adequate energy dissipation capacity. Within this framework, the aim of this paper is to analyse the influence of the response of the connections designed for seismic application on the global behaviour of MRFs under a loss-of-column scenario providing an accurate modelling of connections subjected to combined axial and bending loads. To this scope four different beam-to-column joints designed for seismic actions, previously tested under cyclic load history at the STRENGTH laboratory of Salerno University, have been modelled and introduced in a case-study structure, whose response has been assessed by means of push-down analyses. The performances of the analysed frames have been analysed and is compared using the Residual Reserve Strength Ratio (RRSR) index combined with the energy balance method. [less ▲]

Detailed reference viewed: 14 (0 ULiège)
Full Text
Peer Reviewed
See detailBeam-to-column joints, column bases and joint components under impact loading
Demonceau, Jean-François ULiege; Vanvinckenroye, Hélène ULiege; D'Antimo, Marina ULiege et al

in Proceeding of Eurosteel 2017 conference (2017, September)

Recent events such as natural catastrophes or terrorist attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the ... [more ▼]

Recent events such as natural catastrophes or terrorist attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the University of Liege is strongly involved in researches on the response of structures further to such exceptional events through participations to national or European research projects. In particular, the University of Liege has contributed very recently to a European research project entitled ROBUSTIMPACT investigating the behaviour of steel or steel-concrete composite building structures subjected to impact loading and proposing simplified procedures to predict the response of such structures under the considered scenario. As a contribution to this research project, an experimental test campaign was realised in Liège; the objective was to study the behaviour of beam-to-column joints, of column bases and of most of their constitutive components under impact loading and, in particular, to highlight the influence of the strain rate effects on the response of the studied joints and components. The proposed paper first describes the conducted test campaign with all the required details about the tested specimens and the testing setup; then the analysis of the so-obtained experimental results is presented. Finally authors’ views on how to account for the strain rate effects in analytical approaches for joint design is briefly expressed. [less ▲]

Detailed reference viewed: 23 (2 ULiège)
Full Text
Peer Reviewed
See detailNoël 2010 en Belgique : neige en Flandre et pluie en Haute-Ardenne
Fettweis, Xavier ULiege; Wyard, Coraline ULiege; Doutreloup, Sébastien ULiege et al

in Bulletin de la Société Géographique de Liège (2017), 68

On December 2010, several snow events allowed an exceptional snow cover over Belgium. 27 days with snow cover were observed at Uccle and snow depths of 20, 30 and 70 cm were measured on Christmas 2010 ... [more ▼]

On December 2010, several snow events allowed an exceptional snow cover over Belgium. 27 days with snow cover were observed at Uccle and snow depths of 20, 30 and 70 cm were measured on Christmas 2010 respectively at Uccle, Bierset and Mont Rigi in the Hautes-Fagnes. On December 20, while the entire Belgium was covered by a thick blanket of snow, warmer air invaded the country on December 21. This air was quickly replaced by polar air in Lower and Central Belgium (including Bierset). Heavy snowfalls were observed on December 22 and 23, except in the Upper Ardennes where rainfalls occurred under positive temperature which then dropped to -5°C. This event was due to a strong thermal inversion in the lower layers with warm air at 850 hPa above the Ardennes only. This paper aims to explain this atypical extreme event using the regional climate model MAR developed at the University of Liège [less ▲]

Detailed reference viewed: 28 (3 ULiège)
Full Text
See detailDeux décennies d’augmentation des prix immobiliers résidentiels en Wallonie (1995-2015)
Artige, Lionel ULiege; Reginster, Alexandre ULiege

in Dynamiques régionales (2017), 5(2), 9-22

Detailed reference viewed: 36 (2 ULiège)
Full Text
Peer Reviewed
See detailLes références à la maladie et à son traitement dans les archives de Zénon
Ricciardetto, Antonio ULiege

in Histoire des Sciences Médicales (2017, September), LI(2), 153-162

Amongst the 1837 papyri from the archive of Zenon, the private secretary to Apollonius, finance minister to Ptolemy II Philadelphus (285-246 BC), about twenty private Greek letters refer to ailments ... [more ▼]

Amongst the 1837 papyri from the archive of Zenon, the private secretary to Apollonius, finance minister to Ptolemy II Philadelphus (285-246 BC), about twenty private Greek letters refer to ailments suffered either by the sender or the recipient of the letter, or by a third party. How do these letters, which were not written by medical professionals, designate and describe diseases, their evolution and their outcome? This paper attempts to answer this question, while highlighting the contribution of these documents to the history of health and illness in Ptolemaic Egypt. [less ▲]

Detailed reference viewed: 12 (2 ULiège)