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See detailProhibitive strategies and prohibitive cycles in Ancient Egyptian
Grossman, Eitan; Polis, Stéphane ULg

Scientific conference (2014, December 11)

In this talk, we present the main prohibitive/negative jussive strategies attested for each state of the language in Ancient Egyptian and we describe the grammaticalization pathways of two prohibitive ... [more ▼]

In this talk, we present the main prohibitive/negative jussive strategies attested for each state of the language in Ancient Egyptian and we describe the grammaticalization pathways of two prohibitive constructions, from Old Egyptian down to Coptic. The paper is structured as follows. In the introduction (§1), a brief review of current typological studies of prohibitives will be given as background information. Then, we start with a description of the two main types of prohibitive constructions that one finds in Coptic, taking into dialectal variety (§2), namely mpr+V(ERB) and mn-V(ERB) “do not V”. Afterwards, we describe the grammaticalization pathway along which the first of these two constructions developed, from Old Egyptian down to Coptic (§3). Additionally, we provide a description of the main prohibitive (as well as negative jussive) strategies that are attested for Earlier (§4) and Later Egyptian (§5), in order to situate more precisely the grammaticalization process of the first strategy within the successive ‘synchronic’ systems of oppositions in the semantic field of prohibition. In a final section (§6), we discuss more in depth the second, more marginal, prohibitive construction of Coptic (mn-V) — investigating Coptic dialectal diversity — and we suggest a diachronic scenario that could account for the appearance and development of this second strategy. [less ▲]

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See detailAssessing spatio-temporal variability and trends in modelled and measured Greenland Ice Sheet albedo (2000–2013)
Alexander, P.; Tedesco, M.; Fettweis, Xavier ULg et al

in Cryosphere (The) (2014), 8

Accurate measurements and simulations of Greenland Ice Sheet (GrIS) surface albedo are essential, given the role of surface albedo in modulating the amount of absorbed solar radiation and meltwater ... [more ▼]

Accurate measurements and simulations of Greenland Ice Sheet (GrIS) surface albedo are essential, given the role of surface albedo in modulating the amount of absorbed solar radiation and meltwater production. In this study, we assess the spatio-temporal variability of GrIS albedo during June, July, and August (JJA) for the period 2000–2013. We use two remote sensing products derived from data collected by the Moderate Resolution Imaging Spectroradiometer (MODIS), as well as outputs from the Modèle Atmosphérique Régionale (MAR) regional climate model (RCM) and data from in situ automatic weather stations. Our results point to an overall consistency in spatio-temporal variability between remote sensing and RCM albedo, but reveal a difference in mean albedo of up to ~0.08 between the two remote sensing products north of 70° N. At low elevations, albedo values simulated by the RCM are positively biased with respect to remote sensing products by up to ~0.1 and exhibit low variability compared with observations. We infer that these differences are the result of a positive bias in simulated bare ice albedo. MODIS albedo, RCM outputs, and in situ observations consistently indicate a decrease in albedo of −0.03 to −0.06 per decade over the period 2003–2013 for the GrIS ablation area. Nevertheless, satellite products show a decline in JJA albedo of −0.03 to −0.04 per decade for regions within the accumulation area that is not confirmed by either the model or in situ observations. These findings appear to contradict a previous study that found an agreement between in situ and MODIS trends for individual months. The results indicate a need for further evaluation of high elevation albedo trends, a reconciliation of MODIS mean albedo at high latitudes, and the importance of accurately simulating bare ice albedo in RCMs. [less ▲]

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See detailLaïcité à la française : de la prétention universaliste à l'obsession identitaire
Jacquemain, Marc ULg

Conference (2014, December 11)

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même ... [more ▼]

Le mot "laïcité" est revendiqué par des groupes d'extrême-droite ouvertement racistes et conspirationnistes comme "Riposte laïque". L'article montre que le même imaginaire conspirationniste, sous la même structure narrative peut être retrouvé sous des formes débarrassée de leur racisme explicite dans des textes considérés comme "mainstream" au sein de la laïcité, en analysant un texte du Rappel. A partir de là, on tente de montrer que cette "dérivation conspirationniste" peut trouver des prises dans des formulations "progressistes" de la laîcité dès lors que ces formulations partent pour point de départ le point de vue à la fois holiste et idéaliste d'un "laos" toujours-dejà-là, comme chez Peña ruiz [less ▲]

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See detailPoésie et révolte
Saint-Amand, Denis ULg

Conference given outside the academic context (2014)

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See detailAn Introduction to the Additive Manufacturing of Metallic Materials - Two Case Studies on the Processing of Stainless Steel 316L and of Ti Alloy Ti-6Al-4V
Mertens, Anne ULg

Learning material (2014)

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques” at Université de Liège. It outlines important current issues in ... [more ▼]

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques” at Université de Liège. It outlines important current issues in the developments of additive technologies for the processing of metallic materials by discussing two case studies from researches carried out by the Metallic Materials Science Unit (ULg). In particular, two different metallic alloys, i.e. stainless steel 316L and Ti-6Al-4V, have been processed by laser beam melting under similar conditions, and their microstructures and mechanical behaviours have been compared in details. Under the investigated conditions, Ti-6Al-4V exhibits a more complex behaviour than stainless steel 316L with respect to the occurrence of microstructural and mechanical anisotropy. Moreover, Ti-6Al-4V appears more sensitive to the build-up of internal stresses when compared with stainless steel 316L, whereas stainless steel 316L appears more prone to the formation of “lack of melting” defects. This correlates nicely with the difference in thermal conductivity between the two materials. Thermal conductivity was also shown to increase strongly with increasing temperature. [less ▲]

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See detailModification de la microstructure des métaux après déformation plastique : Restauration et recristallisation
Mertens, Anne ULg

Learning material (2014)

Cette présentation powerpoint vient compléter et illustrer les notes du cours MECA0473-1 "Ingénierie des matériaux métalliques" traitant de l'évolution de la microstructure des métaux suite à une ... [more ▼]

Cette présentation powerpoint vient compléter et illustrer les notes du cours MECA0473-1 "Ingénierie des matériaux métalliques" traitant de l'évolution de la microstructure des métaux suite à une déformation plastique telle que celle imposée typiquement par un procédé de mise en forme comme le laminage. Les phénomènes de restauration et de recristallisation sont discutés en détails du point de vue tant de leurs mécanismes que de leurs cinétiques. Le vieillissement des aciers après déformation est également abordé. [less ▲]

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See detailBias-variance decomposition in Random Forests
Louppe, Gilles ULg

Conference (2014, December 09)

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See detailHigh plasma concentrations of sclerostin, an inhibitor of the Wnt signaling pathway in young horses affected by osteochondrosis
Serteyn, Didier ULg; Mendoza García, Luis ULg; Sandersen, Charlotte ULg et al

in Open journal of orthepedics (2014)

Osteochondrosis (OC) is a developmental disease in horses with a significant impact on the horse’s welfare and performance. The early disturbance of enchondral ossification progresses to inflammatory and ... [more ▼]

Osteochondrosis (OC) is a developmental disease in horses with a significant impact on the horse’s welfare and performance. The early disturbance of enchondral ossification progresses to inflammatory and healing process in older horses. Metabolic pathway analysis showed an obvious dysregulation of several signaling pathways related to cartilage formation and cartilage repair such as Wnt/β-catenin, Indian hedgehog and TGF-β signaling pathways. Other regulated genes appeared to be involved in high carbohydrate diet, abnormal insulin metabolism or inflammation. Sclerostin is an osteocyte-secreted soluble antagonist of the Wnt/β-catenin signaling pathway. It is crucial for osteoblast development and activity and is increased in naturally occurring lesions of equine osteochondrosis. The aim of this study is to compare the circulating sclerostin levels between OC-affected (n = 20) and healthy horses (n = 19). A significant linear regression between plasma sclerostin and age is observed especially in the healthy young horses. The mean plasma sclerostin concentration is significantly higher in young horses suffering from osteochondrosis compared to the control horses. These results reinforce the possible role of the Wnt/β-catenin signaling pathway in the OC pathogeny. The inhibition of this essential pathway could disturb the osteo-chondral differentiation. More studies are currently needed to define the eventual clinic interest of plasma sclerostin as future biomarker in bone and cartilage diseases. [less ▲]

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See detailScience at the fringe of the French colonial world: the circulation of Jean-André Peyssonnel’s treatises on medicine and the natural history of Guadeloupe
Vandersmissen, Jan ULg

Conference (2014, December 05)

Jean-André Peyssonnel, born in Marseille in 1694, was a physician who in 1720-1721 earned his spurs in the fight against the plague that ravaged his hometown. Fascinated by the sea and the work of ... [more ▼]

Jean-André Peyssonnel, born in Marseille in 1694, was a physician who in 1720-1721 earned his spurs in the fight against the plague that ravaged his hometown. Fascinated by the sea and the work of fishermen, he turned in following years to the study of marine life. While conducting observational research along the coasts of the Provence and North Africa, he found evidence of the animal nature of coral. This controversial claim caused a heated debate with Réaumur, who blocked his career plans in France. Out of necessity Peyssonnel was forced to accept the post of “Médecin du Roi” in Guadeloupe. In this remote outpost of the French colonial empire, Peyssonnel continued his scientific activities. He received orders to fight a local outburst of leprosy, which resulted in a comprehensive study on the disease. In addition, he produced dozens of treatises on the natural history of the French Antilles, including volcanic, oceanographic, botanical and zoological studies. This contribution tells the story of these remarkable documents which, on their way to the learned world in Europe, passed through many hands. Spread over several intellectual centres – London, Paris, Marseille, Rouen, Bordeaux, Angers – these manuscripts shed a unique light on the circulation of knowledge in a Republic of Sciences turning global. [less ▲]

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See detailCan Electrical Resistivity Tomography offer us a dynamic view on what happens in the soil-plant continuum?
Garré, Sarah ULg

Conference (2014, December 05)

Root water and nutrient uptake and its relation to environmental factors is one of the least understood components in the terrestrial water balance and is of high importance for water resources management ... [more ▼]

Root water and nutrient uptake and its relation to environmental factors is one of the least understood components in the terrestrial water balance and is of high importance for water resources management, ecology and agriculture. As the processes in the soil-plant continuum are complex and inextricably intertwined, alternative, non-invasive measurement methods are necessary to unravel spatial and temporal dynamics of the system. Electrical resistivity tomography (ERT) has been proposed as a promising technique, since bulk resistivity maps and their temporal evolution may serve as a proxy for changes in soil moisture and pore water salinity, amongst others. However, the variables affecting the measured bulk electrical resistivity often change simultaneously in natural environments and not all influencing factors are yet well understood (e.g. influence of root biomass). Therefore, the method needs field-specific calibration. In addition to limitations due to signal-to-noise ratio and data inversion strategies, this implies that ERT still needs further development and research efforts for its use to characterize the soil-plant continuum. [less ▲]

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See detailHypogonadisme génétique masculin: diagnostic et prise en charge
VALDES SOCIN, Hernan Gonzalo ULg

Scientific conference (2014, December 05)

The neuroendocrine control of reproduction in mammals is governed by a hypothalamic neural network of nearly 1500 gonadotropin-releasing hormone (GnRH) secreting neurons that modulate the activity of the ... [more ▼]

The neuroendocrine control of reproduction in mammals is governed by a hypothalamic neural network of nearly 1500 gonadotropin-releasing hormone (GnRH) secreting neurons that modulate the activity of the reproductive axis across life. Congenital Hypogonadotropic hypogonadism (HH) is a clinical syndrome that is characterized by partial or complete pubertal failure. HH may result from inadequate hypothalamic GnRH axis activation, or a failure of pituitary gonadotropin secretion/effects. In man, several genes that participate in olfactory and GnRH neuronal migration are thought to interact during the embryonic life. A growing list of mutations of these genes is responsible for congenital HH. Based on the presence or the absence of olfaction dysfunction, HH is divided in two syndromes: HH with olfactory alterations (Kallmann syndrome) and Idiopathic hypogonadotropic hypogonadism (IHH) with normal smell (normosmic IHH). Kallmann syndrome (KS) is a heterogeneous disorder affecting 1 in 5000 to 8000 males, with a 3-5 fold male excess over female. KS is associated with mutations in KAL1, FGFR1/FGF8, FGF17, IL17RD, PROK2/PROKR2, NELF, CHD7, HS6ST1 and WDR11 genes that are related to defects in neuronal migration. These reproductive and olfactory deficits include a variable non reproductive phenotype, including sensorineural deafness, coloboma, bimanual synkinesis, craniofacial abnormalities and/or renal agenesis. Interestingly, defects in PROKR2, FGFR1, FGF8, CHD7 and WDR11 genes are also associated with normosmic IHH, whereas mutations in KISS1/KISSR, TAC3/TACR3, GNRH1/GNRHR, βFSH and βLH are only present in patients with normosmic IHH. βLH mutations are responsible for Pasqualini 's Syndrome (fertile eunuch) first described in 1950 in males with eunuchoidism, hypoandrogenism and spermatogenesis in testis biopsies. Congenital primary hypogonadism include several genetic syndromes such as Klinefelter syndrome (XXY), Del Castillo syndrome (only sertoli syndrome).In this lecture, we summarize the reproductive, neurodevelopmental and genetic aspects of IHH and primary hypogonadism in human pathology. [less ▲]

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See detailAnd If It Was No ALS ?
WANG, François-Charles ULg

Scientific conference (2014, December 05)

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See detailUne nouvelle menace pour la couche d'ozone ?
Franco, Bruno ULg

Scientific conference (2014, December 04)

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See detailMid-winter freeze experiment in the Arctic Ocean: Norwegian Young sea ICE cruise (N-ICE2015)
Nomura, Daiki; Granskog, Mats A.; Fransson, Agneta et al

Poster (2014, December 02)

In mid-January 2015, RV Lance will freeze into the ice north of Svalbard, Arctic Ocean at around 83.25°N 30°E, and passively drift with the ice as part of the Norwegian Young sea ICE cruise (N-ICE2015 ... [more ▼]

In mid-January 2015, RV Lance will freeze into the ice north of Svalbard, Arctic Ocean at around 83.25°N 30°E, and passively drift with the ice as part of the Norwegian Young sea ICE cruise (N-ICE2015). Judging from historic sea ice drift trajectories, it is likely that RV Lance will drift in a SW direction and the ship will probably be freed from the ice in mid spring after about two to three months of drift. Thereafter, RV Lance will return to her starting position and start a new drift. Under all circumstances, the ice drift project will end in late June 2015. Throughout the cruise the focus will be on the interaction of the atmosphere-ice-ocean system and the response of the marine ecosystem to the thinner ice regime. The overall goal of the project team is to improve our understanding of the role of the younger ice pack in the Arctic on greenhouse gas fluxes and to ultimately assess whether the Arctic Ocean is a sink or source of greenhouse gases. We plan to conduct long-term synchronous observations of Arctic snow and sea ice biogeochemistry and physics and fluxes of carbon dioxide, methane, nitrous oxide and bromoform. This work targets at filling a crucial gap in our understanding of the role of Arctic sea ice in the climate system. This is done by conducting state of the art observations on Arctic sea ice in the polar night, when observations are basically non-existent. Further we are focusing on the new thinner ice regime, which is even less documented. We aim to understand how the thinner sea ice in the Arctic basin contributes (i) to important greenhouse gas exchange between the atmosphere and ocean and (ii) to aerosol formation, that contribute to the radiative balance of the planet. This work will increase direct collaboration between Japanese and European scientists in the Arctic, and combines complimentary expertise and experience from several international partners to carry out the interdisciplinary work proposed. [less ▲]

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See detailDetecting microbial patterns in relation to soil agricultural practices and the plant development stage
Degrune, Florine ULg; Dufrêne, Marc ULg; Taminiau, Bernard ULg et al

Poster (2014, December 02)

Agricultural practices have a strong impact on soil bacteria and fungi. Furthermore, microbial community composition can change with the stage of plant development. We are interested in exploring these ... [more ▼]

Agricultural practices have a strong impact on soil bacteria and fungi. Furthermore, microbial community composition can change with the stage of plant development. We are interested in exploring these effects in relation to changes induced by agriculture and plant stage in soil conditions. Some bacteria are influenced only by the plant stage, which induces changes in soil humidity, pH, nitrates, and carbon. We would thus expect these bacteria to be highly sensitive to these parameters. Other bacteria are affected only by the tillage practice applied. Further study is needed to identify the soil parameters responsible for this effect. The plant stage also has a great impact on fungal community composition. [less ▲]

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See detailShort-term spectroscopic variability of Plaskett's star
Palate, Matthieu ULg; Rauw, Grégor ULg

in Astronomy and Astrophysics (2014), 572

Context. Plaskett's star (HD 47129) is a very massive O-star binary in a post Roche-lobe overflow stage. CoRoT observations of this system revealed photometric variability with a number of frequencies ... [more ▼]

Context. Plaskett's star (HD 47129) is a very massive O-star binary in a post Roche-lobe overflow stage. CoRoT observations of this system revealed photometric variability with a number of frequencies. <BR /> Aims: The aim of this paper is to characterize the variations in spectroscopy and investigate their origin. <BR /> Methods: To sample its short-term variability, HD 47129 was intensively monitored during two spectroscopic campaigns of six nights each. The spectra were disentangled and Fourier analyses were performed to determine possible periodicities and to investigate the wavelength dependence of the phase constant and the amplitude of the periodicities. <BR /> Results: Complex line profile variations are observed. Frequencies near 1.65, 0.82, and 0.37 d[SUP]-1[/SUP] are detected consistently in the He i λ 4471, He ii λ 4542, and N iii λ 4510-4518 lines. These frequencies are consistent with those of the strongest signals detected in photometry. The possibilities that these variations stem from pulsations, a recently detected magnetic field or tidal interactions are discussed. <BR /> Conclusions: Whilst all three scenarios have their strengths, none of them can currently account for all the observed properties of the line profile variations. Based on observations collected at the Observatoire de Haute Provence (OHP, France). [less ▲]

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See detailThe sentence repetition task: A powerful diagnostic tool for French children with specific language impairment
Leclercq, Anne-Lise ULg; Quémart, Pauline; Magis, David ULg et al

in Research in Developmental Disabilities (2014), 35

This study assesses the diagnostic accuracy and construct validity of a sentence repetition task that is commonly used for the identification of French children with specific language impairment (SLI ... [more ▼]

This study assesses the diagnostic accuracy and construct validity of a sentence repetition task that is commonly used for the identification of French children with specific language impairment (SLI). Thirty-four school-aged children with a confirmed, diagnostically based diagnosis of SLI, and 34 control children matched on age and nonverbal abilities performed the sentence repetition task. Two general scoring measures took into account the verbatim repetition of the sentence and the number of words accurately repeated. Moreover, five other scoring measures were applied to their answers in order to separately take into account their respect of lexical items, functional items, syntax, verb morphology, and the general meaning of the sentence. Results show good to high levels of sensitivity and specificity at the three cut-off points for all scoring measures. A principal component analysis revealed two factors. Scoring measures for the respect of functional words, syntax and verb morphology provided the largest loadings to the first factor, while scoring measures for the respect of lexical words and general semantics provided the largest loadings to the second factor. Sentence repetition appears to be a valuable tool to identify SLI in French children, and the ability to repeat sentences correctly is supported by two factors: a morphosyntactic factor and a lexical factor. [less ▲]

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