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See detailCaractérisation multiéchelle du loess de Hesbaye (Belgique) par une approche couplée géologique et géotechnique
Delvoie, Simon ULiege

Doctoral thesis (2017)

A thorough analysis is performed on aeolian silt (loess) deposits. The study is based on an original approach combining geological aspects with physical and mechanical properties of the material. This ... [more ▼]

A thorough analysis is performed on aeolian silt (loess) deposits. The study is based on an original approach combining geological aspects with physical and mechanical properties of the material. This approach is realized by means of a multiscale experimental analysis in which cone penetration test plays a key role. The approach is applied to the study of loess deposits located in the Hesbaye region (Belgium), in which the site of the Romont quarry (Eben-Emael, Belgium) is the subject of a more comprehensive and a more detailed study. About the stratigraphic aspects, a continuous geological cross-section performed along a 18 km long section of the high-speed railway between Liège and Waremme, underlines the variability of the thickness of the loess layer which can locally reach 20 m. The loess sequence is further investigated in three Hesbayan sites (Remicourt, Romont and Rocourt) with cone penetration test (CPT) campaign. The analysis of the cone resistance of the CPT reveals it is possible to define four stratigraphic markers within the regional loess sequence: the near surface decarbonation limit, the transition between the Nagelbeek Tongued Horizon and the underlying Hesbayan loess, the Humiferous Complex of Remicourt, and the Whitish horizon of Momalle on top of the Rocourt Pedocomplex. Physical, geochemical and microstructural characteristics determined from laboratory analyses on samples stratigraphically located around the stratigraphic markers, enable a better understanding of the observed variations of the in situ mechanical behaviour. Porosity, volumetric weight and clay content seem to be three major variables in the understanding of the observed variations of cone resistance. A comparative analysis of geomechanical properties has also been conducted either from different data related to CPT or between CPT results and laboratory measurements. This study includes four items: (i) the comparative analysis of measurements achieved by different CPT cone types (M1, M2 and E), clearly indicates the cone type has negligible influence on the measured cone resistance for silty material. (ii) Soil behaviour type charts based on CPT data confirm the relative heterogeneity of the investigated silty material. (iii) The empirical relation between the oedometric modulus and the cone resistance of the CPT, including the α factor depending on the soil type, is verified for the studied silty material. (iv) A semi-empirical approach based on the bearing capacity theory has been developed to estimate mean apparent cohesion and friction angle of the silt. Finally, results of this PhD thesis may be used for specific and original applications: (i) CPT testing seems to be an interesting investigation technique for rescue archaeology in loess context. (ii) Thanks to the in-depth investigation, the Romont site (Belgium) may provide an interesting site wherein sensors or investigation tests related to geomechanical, physical or structural properties of the material may be tested or calibrated into a natural silty medium. (iii) The detailed characterisation of aeolian silt leads to numerous properties related to geomechanical, physical and geochemical aspects of the material. These data may be used in studies dealing with loess deposits. [less ▲]

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See detailThe Photoelectron Spectroscopy of The Dichoroetylenes: The Geminal Isomer 1,1- Cl2C2H2. An Experimental and Quantum Chemical Study.
Locht, Robert ULiege; Dehareng, Dominique; Leyh, Bernard ULiege

in Journal of Physics Communications (2017), 1(5), 5030

This work analyzes the threshold photoelectron spectrum (TPES) and selected Constant Ion State (CIS) spectra of the 1,1-C2H2Cl2 isomer measured using synchrotron radiation. The TPES is compared to the HeI ... [more ▼]

This work analyzes the threshold photoelectron spectrum (TPES) and selected Constant Ion State (CIS) spectra of the 1,1-C2H2Cl2 isomer measured using synchrotron radiation. The TPES is compared to the HeI-, NeI- and ArII-photoelectron spectra (PES). In the HeI-PES nine photoelectron bands have been observed at vertical ionization energies of 9.992 eV, 11.652 eV, 12.157 eV, 12.536 eV, 13.633 eV, 14.195 eV, at about 15.9 eV and 16.2 eV and at 18.496 eV successively. For most of these bands the adiabatic ionization energy could be determined and a detailed vibrational analysis of the first four bands is presented. All these bands exhibit an extended vibrational structure. In particular, the ground electronic state and the third excited state display an extended vibrational structure upon excitation by the ArII-resonance line. The assignments of the electronic bands and of the vibrational structure are based on quantum chemical calculations. These allowed us to assign the nine electronic states in terms of ionization and double excitation in a molecular orbital scheme. The good correlation between predicted vibrational wavenumbers and the experimental values allowed us to assign all observed vibrational structures. The CIS spectrum of the eight first electronic states of 1,1-C2H2Cl2+ have also been recorded. Vibrationally resolved CIS spectra of the molecular ion ground state have been obtained and are discussed. [less ▲]

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See detailLe chemin de Jacques STOTZEM
Sacré, Robert ULiege

E-print/Working paper (2017)

Interview de Jacques Stotzem au sujet de son 15è album "The Way To Go" ; toutes les compositions sont originales.

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See detailPalynologie et environnements des sédiments du Dévonien de Saïda (Algérie nord occidentale)
Bougara, M; Steemans, Philippe ULiege; Le Hérissé, A. et al

in Carnets de Géologie = Notebooks on Geology (2017), 17(10), 191-219

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See detailNon-renewable and intermittent renewable energy sources: friends and foes?
Jacqmin, Julien ULiege; Barranes, Edmond; Poudou, Jean-christophe

in Energy Policy (2017), 111

This paper studies the links between non-renewable and intermittent renewable energy sources in the production of electricity. Using U.S. state-level data from 1998 to 2015, we find that the relationship ... [more ▼]

This paper studies the links between non-renewable and intermittent renewable energy sources in the production of electricity. Using U.S. state-level data from 1998 to 2015, we find that the relationship between the price of natural gas and investments in solar and wind capacity is non-linear and can be represented by an inverted U-shape. Hence, for relatively low natural gas prices, the two modes of production are substitutes. After a price threshold is reached, the two are complementary. A theoretical explanation argues that this stylized fact is the result of a trade-off between two characteristics of these modes of production: the high degree of flexibility of electricity production using natural gas as an input and the low marginal cost of renewable energy sources. [less ▲]

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See detailVariable‐energy electron ionisation for GC×GC forensic blood VOC profiling
Dubois, Lena ULiege; Perrault, Katelynn ULiege; Stefanuto, Pierre-Hugues ULiege et al

Scientific conference (2017, December)

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See detailGC-MS Orbitrap and GC×GC-(HR)TOFMS in colorectal cancer metabolomics
Di Giovanni, Nicolas ULiege; Cojocariu, C; Silcock, P et al

Poster (2017, December)

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See detailTraduction en langue française de la version longue du « Back Pain Attitudes Questionnaire » et étude de ses qualités psychométriques
Demoulin, Christophe ULiege; Halleux, Valentine; Darlow, Ben et al

in Mains libres (2017), 4

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See detailData-driven probabilistic post-earthquake fire ignition model for a community
Elhami Khorasani, Negar; Gernay, Thomas ULiege; Garlock, Maria

in Fire Safety Journal (2017), 94

Fire following earthquake (FFE), a cascading multi-hazard event, can cause major social and economical losses in a community. In this paper, two existing post-earthquake fire ignition models that are ... [more ▼]

Fire following earthquake (FFE), a cascading multi-hazard event, can cause major social and economical losses in a community. In this paper, two existing post-earthquake fire ignition models that are implemented in Geographic Information System (GIS) based platforms, Hazus and MAEViz/Ergo, are reviewed. The two platforms and their FFE modules have been studied for suitability in community resiliency evaluations. Based on the shortcomings in the existing literature, a new post-earthquake fire ignition model is proposed using historical FFE data and a probabilistic formulation. The procedure to create the database for the model using GIS-based tools is explained. The proposed model provides the probability of ignition at both census tract scale and individual buildings, and can be used to identify areas of a community with high risk of fire ignitions after an earthquake. The model also provides a breakdown of ignitions in different building types. Finally, the model is implemented in MAEViz/Ergo to demonstrate its application in a GIS-based software. [less ▲]

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See detail"Subaltern China: Rural Migrants, Media, and Cultural Practices, by Wanning Sun,"
Florence, Eric ULiege

in China Journal (The) (2017), 79

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See detailLe mystère de la disparition des dinosaures
Fischer, Valentin ULiege

Conference given outside the academic context (2017)

Les dinosaures captent l'imaginaire populaire par leurs tailles et leurs morphologies parfois démesurées. Ils véhiculent ainsi, assez logiquement, une image d'un groupe animal résistant et innovant ... [more ▼]

Les dinosaures captent l'imaginaire populaire par leurs tailles et leurs morphologies parfois démesurées. Ils véhiculent ainsi, assez logiquement, une image d'un groupe animal résistant et innovant, capable de résister aux changements de la Terre. Or, à l'heure actuelle, il ne subsiste des dinosaures qu'un seul groupe de théropodes, les oiseaux. Ceci est résultat d'une extinction dite "de masse" qui s'est déroulée il y a 66 millions d'années, à la fin du Crétacé. Nous analyserons le détail et le contexte de cette disparition afin de comprendre les raisons biologiques, géologiques voire spatiales pouvant amener des groupes diversifiés peuvent être amenés à l'extinction. [less ▲]

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See detailThe worked bone industry and intrusive fauna associated with the prehistoric cave burials of Abri des Autours (Belgium)
Goffette, Quentin; Rots, Veerle ULiege; Polet, Caroline et al

in Anthropozoologica (2017), 52(2), 185-201

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See detailPolitique de la Ville - Renforcement des centralités urbaines et de leur attractivité sous l'angle économique
Bianchet, Bruno ULiege; Claeys, Dorian ULiege; Descamps, Julien et al

Report (2017)

La référence en question est le rapport final de la recherche n°8 de la subvention 2017 de la CPDT. L'objet de la recherche est d'inscrire le développement économique comme une préoccupation majeure de la ... [more ▼]

La référence en question est le rapport final de la recherche n°8 de la subvention 2017 de la CPDT. L'objet de la recherche est d'inscrire le développement économique comme une préoccupation majeure de la réflexion sur la ville, tant dans la perspective de l'attractivité urbaine que dans la perspective du développement territorial régional. La recherche s'inscrit dans la poursuite de la réflexion entamée depuis 2014 lors des deux précédentes recherches menées par la CPDT à propos de la mise en place d'une politique de la ville en Wallonie. [less ▲]

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See detailCuriosité : le « curly birch ». Une figuration ondée, rare et recherchée du bois de bouleau
Dubois, Héloïse ULiege; Layon, José; Claessens, Hugues ULiege

in FORÊT.NATURE (2017), (145), 12-15

Nos forêts et leur gestion doivent s’adapter à de grands changements, qu’ils soient climatiques, socio-économiques ou sanitaires. De ce point de vue, le bouleau possède de nombreux atouts, tant en termes ... [more ▼]

Nos forêts et leur gestion doivent s’adapter à de grands changements, qu’ils soient climatiques, socio-économiques ou sanitaires. De ce point de vue, le bouleau possède de nombreux atouts, tant en termes écologiques qu’économiques et sylvicoles. De plus en plus abondant en Europe occidentale, il deviendra à l’avenir un facteur déterminant des décisions sylvicoles. Une recherche approfondie sur l’intérêt de l’essence pour la gestion forestière, ses filières économiques, sa croissance et, surtout, la sylviculture à lui apporter, est en cours à Gembloux Agro-Bio Tech (Liège Université) avec le financement de l’Accord-cadre de recherches et vulgarisation forestières. Elle a notamment été l’occasion de riches échanges avec la Finlande, pays le plus boisé d’Europe. Le bouleau y est une composante très importante des forêts, de l’économie du pays, de la construction et de l’ameublement. Cet article constitue un détour original afin de présenter une figuration rare du bois de bouleau, qui amusera les passionnés du bois et les curieux. Il s’agit du « curly birch », littéralement le « bouleau ondé », actuellement anecdotique mais très lucratif. [less ▲]

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See detailEl nexo entre gastronomía y migración: el caso de la diáspora mexicana en Europa
Lara Guerrero, Larisa Viridiana ULiege

Diverse speeche and writing (2017)

La gastronomía constituye un símbolo de identidad nacional que produce orgullo, alegría y bienestar. Los aromas, ingredientes y sabores de ciertos platillos desencadenan memorias con la familia y ... [more ▼]

La gastronomía constituye un símbolo de identidad nacional que produce orgullo, alegría y bienestar. Los aromas, ingredientes y sabores de ciertos platillos desencadenan memorias con la familia y recuerdos gratos con los amigos. Sin lugar a duda, la comida tradicional es una plataforma que yuxtapone sentimientos de nostalgia y de gran júbilo. Estos sentimientos se intensifican al vivir fuera de nuestro país de origen. En este ensayo se presentan diferentes estrategias que migrantes lationamericanos viviendo en Europa han establecido para poder preparar la comida que los conecta a sus raíces. El ensayo presenta ejemplos recaudados a partir de entrevistas con migrantes mexicanos viviendo en Bratislava, París y Bruselas. Concretamente, el ensayo explora cómo la gastronomía nacional ha moldeado las estrategias de migración y de vida de tres mexicanos en Europa. A partir de sus historias de vida, este ensayo hace reflexiones sobre el impacto que la cocina tradicional mexicana puede tener en la forma de migrar, en el acceso a empleo y en la identidad de los migrantes. [less ▲]

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See detailSunscreens block cutaneous vitamin D production with only a minimal effect on circulating 25-hydroxyvitamin D
Libon, Florence ULiege; Courtois, Justine; LE GOFF, Caroline ULiege et al

in Archives of Osteoporosis (2017)

Summary A 50+ SPF sunscreen decreased significantly cutaneous vitamin D production following a single narrow-band (nb)UVB exposure, independently from the body surface area exposed. In contrast, the ... [more ▼]

Summary A 50+ SPF sunscreen decreased significantly cutaneous vitamin D production following a single narrow-band (nb)UVB exposure, independently from the body surface area exposed. In contrast, the circulating 25(OH)D3 levels were only minimally affected. It is probable that another endogenous source of precursors is selected when skin-originated precursors are lacking. Purpose Sunscreen use, highly advocated for preventing cutaneous carcinogenesis, is potentially leading to an aggravation of vitamin D deficiency with its consequences on bone health. The effect of sunscreens on circulating vitamin D levels remains debated. This study investigated the effect of sunscreen on cutaneous vitamin D production and circulating 25(OH)D3 levels, according to different body surface areas (BSA). Methods Vitamin D and 25(OH)D3 levels were measured in four groups exposed to a single nbUVB exposure on 9% (group I: head and hands), 23% (group II: head, hands and arms), 50% (group III: head, hands, arms and legs) and 96% (group IV: total body) of the body surface without and with a 50+ sun protection factor sunscreen. Results Sunscreen use decreased by 83, 88.3, 75.7 and 92.5% the cutaneous vitamin D production in groups I to IV, respectively, but only by 13.2, 10.5, 7.7 and 10.4% the values of circulating 25(OH)D3, correspondingly. Conclusions Although a 50+ sunscreen decreases significantly cutaneous vitamin D production following a single nbUVB exposure, and independently from the BSA, the circulating 25(OH)D3 levels were only minimally affected. This could be explained by a switch to another endogenous source of precursors. Short-term sunscreen use probably does not affect circulating vitamin D levels and hence does not increase the risk for osteoporosis. The effect of long-term sunscreen use remains however to be determined. [less ▲]

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See detailParaneoplastic secretion in parathyroid carcinoma: serum hCG as a tumor marker
VALDES SOCIN, Hernan Gonzalo ULiege; BETEA, Daniela ULiege; Daly, Adrian ULiege et al

in Acta Clinica Belgica (2017), 72(2), 5

Introduction Parathyroid carcinoma (PCa) is a rare presentation of primary hyperparathyroidism (PHPT), accounting for less than 1 % of cases. Differentiating parathyroid cancer from adenoma is clinically ... [more ▼]

Introduction Parathyroid carcinoma (PCa) is a rare presentation of primary hyperparathyroidism (PHPT), accounting for less than 1 % of cases. Differentiating parathyroid cancer from adenoma is clinically challenging. Rubin et al (2008) et al. suggested that urinary hCG might be a marker of disease progression in PCa. In this study, we aimed to investigate whether the hCG+β kit from Roche Diagnostics could distinguish PCa patients from PHPT. Material and methods We studied a series of 8 patients suffering from advanced PCa, referred to the CHU de Liege. A control group of 20 PHPT patients was used as comparative. hCG+β kit on Cobas (Roche Diagnostics) uses 2 monoclonal antibodies that recognize holo-hCG, nicked hCG, β-core fragment and free β-subunit. Limits of hCG detection and quantification are <0.1 and <0.6 mUI/mL. In non pregnant and postmenopausal women and in men, hCG (p95) is <1 (5.3), <7 mUI/mL (8.3) and <2 (2.6) mUI/mL, respectively. Results. The 8 PCa patients (3 women) presented high serum hCG values at: 1.29, 3.46, 5.7, 24.2, 31.2, 34.1, 36.5 and 164 mUI/mL. Values of 1.29 and 3.46 were obtained in 2 postmenopausal women. The lowest value was presented by the only still alive patient. There was a significant correlation (r=0.786; ρ <0.05) between hCG and PTH and a borderline correlation (r=0.750; ρ =0.05) between hCG and calcium concentrations. All PHP patients presented undetectable hCG values. Conclusions These results suggest that serum hCG might have the potential to discriminate between parathyroid adenomas and carcinomas, with a sensibility of 75% (6/8) and a specificity of 100% (0/20). The only patient still alive presented the lowest hCG values. If hCG could be predictive of PCa survival needs to be studied in a larger series of patients. [less ▲]

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See detailTraumatologie des sports olympiques de ballon en salle. Partie 3 : le volley-ball et comparaison des 3 sports
Kaux, Jean-François ULiege; Roberjot, Mathieu; DELVAUX, François ULiege et al

in Journal de Traumatologie du Sport (2017), 34(4), 217-222

In volleyball, there is no contact between opponents (excepting faults). Overloading injuries are very frequent, and often involve the knee joint(jumper’s knee), the shoulders (cuff injuries), or the ... [more ▼]

In volleyball, there is no contact between opponents (excepting faults). Overloading injuries are very frequent, and often involve the knee joint(jumper’s knee), the shoulders (cuff injuries), or the spine (spondylolysis). Ankle sprains is the most common trauma, mainly occurring during theattack phase and in the defense position at the net. Among the three Olympic indoor ball sports, volleyball produces the least number of seriousinjuries due to the absence of contact between opponents. Trauma prevalence is mainly observed during games and when the playing surface isinappropriate. [less ▲]

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See detailLe GRIF, la forme revue au féminin ?
Glorie, Caroline ULiege

in Cahiers du GRM (2017), n°12

L’article propose une grille de lecture des Cahiers du Grif à partir des concepts et de la réception en leur sein de la pensée d’Hannah Arendt. L’enjeu de l’article est d’interpréter les continuités et ... [more ▼]

L’article propose une grille de lecture des Cahiers du Grif à partir des concepts et de la réception en leur sein de la pensée d’Hannah Arendt. L’enjeu de l’article est d’interpréter les continuités et les ruptures qui ont marqué les Cahiers du Grif pendant les années quatre-vingt. [less ▲]

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