Last 7 days     Results 1341-1360 of 39106.   63 64 65 66 67 68 69 70 71 72 73   Variability in the super-Earth 55 Cnc eDemory, Brice-Olivier; Gillon, Michaël ; Madhusudhan, Nikku et alE-print/Working paper (2015)Considerable progress has been made in recent years in observations of atmospheric signatures of giant exoplanets, but processes in rocky exoplanets remain largely unknown due to major challenges in ... [more ▼]Considerable progress has been made in recent years in observations of atmospheric signatures of giant exoplanets, but processes in rocky exoplanets remain largely unknown due to major challenges in observing small planets. Numerous efforts to observe spectra of super-Earths, exoplanets with masses of 1-10 Earth masses, have thus far revealed only featureless spectra. In this paper we report a 4-$\sigma$ detection of variability in the dayside thermal emission from the transiting super-Earth 55 Cancri e. Dedicated space-based monitoring of the planet in the mid-infrared over eight eclipses revealed the thermal emission from its dayside atmosphere varying by a factor 3.7 between 2012 and 2013. The amplitude and trend of the variability are not explained by potential influence of star spots or by local thermal or compositional changes in the atmosphere over the short span of the observations. The possibility of large scale surface activity due to strong tidal interactions possibly similar to Io, or the presence of circumstellar/circumplanetary material appear plausible and motivate future long-term monitoring of the planet. [less ▲]Detailed reference viewed: 13 (1 ULg) Photometric identification of the periods of the first candidate extragalactic magnetic massive starsNazé, Yaël ; Walborn, Nolan R.; Morrell, Nidia et alin Astronomy and Astrophysics (2015), 577Galactic stars belonging to the Of?p category are all strongly magnetic objects exhibiting rotationally modulated spectral and photometric changes on timescales of weeks to years. Five candidate Of?p ... [more ▼]Galactic stars belonging to the Of?p category are all strongly magnetic objects exhibiting rotationally modulated spectral and photometric changes on timescales of weeks to years. Five candidate Of?p stars in the Magellanic Clouds have been discovered, notably in the context of ongoing surveys of their massive star populations. Here we describe an investigation of their photometric behaviour, revealing significant variability in all studied objects on timescales of one week to more than four years, including clearly periodic variations for three of them. Their spectral characteristics along with these photometric changes provide further support for the hypothesis that these are strongly magnetized O stars, analogous to the Of?p stars in the Galaxy. [less ▲]Detailed reference viewed: 4 (0 ULg) Influence of bottom currents on the sedimentary processes at the western tip of the Gulf of Corinth, GreeceBeckers, Arnaud ; Beck, Christian; Hubert, Aurelia et alin Marine Geology (2015)We investigated the sedimentary processes that were active during the Holocene in the Gulf of Corinth, using high-resolution seismic reflection profiles and gravity cores. Seismic reflection data clearly ... [more ▼]We investigated the sedimentary processes that were active during the Holocene in the Gulf of Corinth, using high-resolution seismic reflection profiles and gravity cores. Seismic reflection data clearly show the presence of shallow-water sediment drifts at the western end of the Gulf, close to the Rion Sill that links the gulf to the Ionian Sea. Short cores indicate that drifts are composed of homogenous bioturbated mud in their upper part. The drift deposits flank a wide central area where the sea floor is eroded and where pre-Holocene deposits locally outcrop. The sea floor morphology in this area is marked by furrows oriented in different directions and by a depression attributed to the action of bottom-currents. The magnetic fabric of sediment samples from the drift, shelves, sub-basins and from the basin floor show a significant anisotropy and a similar orientation of Kmax axes along core. The largest anisotropy (P = 1.043 ± 0.007) is observed in the drift and is interpreted as resulting from the action of bottom currents. The similar orientation of Kmax axes in the other cores, collected from areas East of the drifts, suggests that bottom currents also affect sediment deposition in the rest of the study area, even if seismic profiles and core analyses demonstrate that gravitational processes such as submarine landslides and turbidity currents exert the main control on sediment transport and deposition. Average Kmax axes for four cores were reoriented using the declination of the characteristic remanent magnetization. Kmax axes show variable orientations relatively to the slope of the sea floor, between along-slope and roughly parallel to the contour lines. [less ▲]Detailed reference viewed: 27 (1 ULg) Learning from blind tests: residues on grinding stones and flaked stone toolsRots, Veerle ; Hayes, Elspeth; Cnuts, Dries et alConference (2015, May)Detailed reference viewed: 16 (2 ULg) Stone tool use and hominin evolutionFullagar, Richard; Rots, Veerle Conference (2015, May)Detailed reference viewed: 8 (0 ULg) Expression of sexual ornaments in a polymorphic species: phenotypic variation in response to environmental riskWinandy, Laurane ; Denoël, Mathieu in Journal of Evolutionary Biology (2015), 28(5), 1049-1056Secondary sexual traits may evolve under the antagonistic context of sexual and natural selection. In some polymorphic species, these traits are only expressed during the breeding period and are ... [more ▼]Secondary sexual traits may evolve under the antagonistic context of sexual and natural selection. In some polymorphic species, these traits are only expressed during the breeding period and are differently expressed in alternative phenotypes. However, it is unknown whether such phenotypes exhibit phenotypic plasticity of seasonal ornamentations in response to environmental pressures such as in the presence of fish (predation risk). This is an important question to understand the evolution of polyphenisms. We used facultative paedomorphosis in newts as a model system because it involves the coexistence of paedomorphs that retain gills in the adult stage with metamorphs that have undergone metamorphosis, but also because newts exhibit seasonal sexual traits. Our aim was therefore to determine the influence of fish on the development of seasonal ornamentation in the two phenotypes of the palmate newt (Lissotriton helveticus). During the entire newt breeding period, we assessed the importance of phenotype and fish presence with an information-theoretic approach. Our results showed that paedomorphs presented much less developed ornamentation than metamorphs and those ornamentations varied over time. Fish inhibited the development of sexual traits but differently between phenotypes: in contrast to metamorphs, paedomorphs lack the phenotypic plasticity of sexual traits to environmental risk. This study points out that internal and external parameters act in complex ways in the expression of seasonal sexual ornamentations and that similar environmental pressure can induce a contrasted evolution in alternative phenotypes. [less ▲]Detailed reference viewed: 56 (18 ULg) Inégalités entre élèves et inégalités structurelles en Fédération Wallonie-Bruxelles. L'apport de l'enquête PISABaye, Ariane in Eduquer : Tribune Laïque (2015), 114Detailed reference viewed: 19 (0 ULg) Searching for early traces of fire production on flint toolsSorensen, Andrew; Rots, Veerle Conference (2015, May)Detailed reference viewed: 5 (0 ULg) The stadium of Olympia: a dialogical compositionKiuri, Miranda; Teller, Jacques in Montanola, J (Ed.) International Journal Arquitectonics: Architecture, phenomenology & social dialogics (2015)The article proposes a renewed interpretation of the relation of the antique stadium of Olympia with its built environment. It is argued that the stadium, far from being isolated from the city as commonly ... [more ▼]The article proposes a renewed interpretation of the relation of the antique stadium of Olympia with its built environment. It is argued that the stadium, far from being isolated from the city as commonly considered, was connected to the Altis through a series of visual relations, adopting principles of dialogical architecture: composition, significant location, functional routes, perceptions, role of architectonic elements and spatial characteristics. This argument is illustrated through computer-generated perspectives of the stadium. [less ▲]Detailed reference viewed: 21 (0 ULg) Beam to concrete-filled rectangular hollow section column joints using long boltsHoang, Van Long ; Demonceau, Jean-François ; Jaspart, Jean-Pierre in Proceedings of the 15th international symposium on tubular structures - ISTS15 (2015, May)This paper presents a research on a specific type of unstiffened extended end-plate joint used to connect I-shaped beams to concrete-filled rectangular hollow section columns. The main idea is to use long ... [more ▼]This paper presents a research on a specific type of unstiffened extended end-plate joint used to connect I-shaped beams to concrete-filled rectangular hollow section columns. The main idea is to use long bolts throughout the column to connect the beam end-plates, so avoiding intermediate connecting elements (e.g. a reverse U channel) or special bolts (e.g. blind bolts). However, the use of long bolts for beam-to-column connections is still rare in the construction and no design procedure exists in the Eurocodes; this justifies the pre-sent research. Firstly, a test program within a RFCS European project titled HSS-SERF “High Strength Steel in Seismic Resistant Building Frames”, 2009-2013 was performed. In this project, specimens subjected to sig-nificant bending moments (and shear) or to shear only was defined. Then, analytical developments based on the component approach and aimed at predicting the joint response have been carried out; their validity is demonstrated through comparisons with the tests. Finally, design guidelines have been provided. [less ▲]Detailed reference viewed: 47 (9 ULg) Adolescent delinquent behaviours as attempts of group social integration and well-being through social acceptance?Born, Michel ; Cattelino, Elena; Gavray, Claire et alin Carneiro, Roberto; Carneiro, Maria Ana (Eds.) Youth, Offense and Well-Being . Can Science Enlighten Policy? (2015)Large surveys in Western countries give pictures of adolescent well-being related to delinquency and group affiliation. The belonging to a particular country, city or neighbourhood with their social ... [more ▼]Large surveys in Western countries give pictures of adolescent well-being related to delinquency and group affiliation. The belonging to a particular country, city or neighbourhood with their social structure influences the probability to have delinquent activities in group increasing or decreasing the risk of marginalisation, the sensibility to deviant values and the well-being related to peers’ acceptance. A general process would exist by which, firstly adolescents oppose themselves to the parents’ authority and seek for acceptance among their peers. This leads to a spiral when the youth tries to resolve his cognitive dissonance between the immoral acts he is invited to commit with his friends and his personal value system learned in his family, school and other institutions. In adolescence, the influence of peers can be positive or negative; it can be “protective peer-contagion” with positive response to normative talk or “deviant peer-contagion” with positive response to deviant talk or behaviour. At the micro level, well-adjusted peers are able to resist the influence of deviant peers. The participation to non-homogenous mixed groups seems to facilitate more normative talks. This leads to the hypothesis that the progressive extension to differentiated groups when adolescence is going through will strengthen their ties with conventional norms and contribute to their well-being. [less ▲]Detailed reference viewed: 9 (0 ULg) High output [18F]FDOPA on AllInOne (Trasis) at commercial scaleOtabashi, Muhammad; Cascione, Christian; Lemaire, Christian et alin Journal of Labelled Compounds & Radiopharmaceuticals (2015, May), 58Detailed reference viewed: 24 (3 ULg) Gestion du stress professionnel : Sensibilisation aux processus psychologiques et outils de gestion dérivés.Brouette, Béatrice; Stassart, Céline ; Bragard, Isabelle et alConference (2015, May)Detailed reference viewed: 17 (0 ULg) Radar remote sensing observations to monitor landslides and prepare inventories for hazard assessmentSchlögel, Romy; Havenith, Hans-Balder ; Malet, Jean-Philippe et alScientific conference (2015, May)Abstract: The creation of a landslide inventory encompassing multi-temporal information needs high quality and high-resolution data source as well as a good knowledge of the field. Visual image ... [more ▼]Abstract: The creation of a landslide inventory encompassing multi-temporal information needs high quality and high-resolution data source as well as a good knowledge of the field. Visual image interpretation and field surveys are the prevailing methods for landslide inventory mapping while remote sensing techniques have become a widely used source of information for measuring the topography and deformation of the Earth surface (e.g. Berardino et al., 2002). Semi-automatic image analysis methods based on remote sensing techniques are proposed but their quality lacks behind the expert mappings (Guzzetti et al., 2012). Advance processing of SAR images have proven their ability for: (1) landslide detection and mapping (Farina et al., 2006; Cascini et al., 2009; Guzzetti et al., 2012), (2) process monitoring (Hilley et al., 2004; Zhao et al., 2012), (3) hazard assessment (e.g. Nikolaeva et al., 2014) and (4) risk management (Bardi et al., 2014). ... [less ▲]Detailed reference viewed: 18 (0 ULg) The Kambarata 2 blast-fill dam, Kyrgyz Republic: blast event, geophysical monitoring and dam structure modellingHavenith, Hans-Balder ; Torgoev, Isakbek; Torgoev, Almazbek et alin Geoenvironmental Disasters (2015), 2(1), 1-15Abstract Background The blast-and earth-fill dam of the Kambarata 2 hydropower station is situated in the seismically active Central Tien Shan region of the Kyrgyz Republic. More than 70% of the dam ... [more ▼]Abstract Background The blast-and earth-fill dam of the Kambarata 2 hydropower station is situated in the seismically active Central Tien Shan region of the Kyrgyz Republic. More than 70% of the dam volume was produced during a blast event on December 22, 2009. In 2010– 2011, dam construction was completed after earth filling on top of the blasted material and installing concrete and clay screens together with bentonite grouts. A geophysical survey had been completed in 2012–2013, mainly to monitor the resistivities inside the dam. ... [less ▲]Detailed reference viewed: 6 (0 ULg) Soutenir la rénovation énergétique des bâtiments : le projet eeef pour la rénovation de 15 bâtiments du Centre Hospitalier Universitaire et de l'Université de Liège.Prégardien, Michel ; Marique, Anne-Françoise Poster (2015, May)Detailed reference viewed: 12 (2 ULg) Conduite optimisée de la Romanche : Détermination du lâcher d'alerte au barrage de Livet (phase 2)Stilmant, Frédéric ; Erpicum, Sébastien ; Archambeau, Pierre et alReport (2015)Detailed reference viewed: 19 (1 ULg) Sablière Tout Lui Faut - Mise à jour du rapport TLF09/1 – Synthèse des données hydrogéologiquesOrban, Philippe ; Dassargues, Alain Report (2015)Detailed reference viewed: 15 (0 ULg) 'Een lent van vaerzen' als letterkundig spiegelkabinetSteyaert, Kris in Arabesken: Tijdschrift van het Louis Couperus Genootschap (2015)Detailed reference viewed: 10 (3 ULg) Valid inequalities for the single arc design problem with set-upsAgra, Agostinho; Doostmohammadi, Mahdi; Louveaux, Quentin in Discrete Optimization (2015), 16We consider a mixed integer set which generalizes two well-known sets: the single node fixed- charge network set and the single arc design set. Such set arises as a relaxation of feasible sets of general ... [more ▼]We consider a mixed integer set which generalizes two well-known sets: the single node fixed- charge network set and the single arc design set. Such set arises as a relaxation of feasible sets of general mixed integer problems such as lot-sizing and network design problems. We derive several families of valid inequalities that, in particular, generalize the arc resid- ual capacity inequalities and the flow cover inequalities. For the constant capacitated case we provide an extended compact formulation and give a partial description of the convex hull in the original space which is exact under a certain condition. By lifting some basic inequalities we provide some insight on the difficulty of obtaining such a full polyhedral description for the constant capacitated case. Preliminary computational results are presented. [less ▲]Detailed reference viewed: 42 (10 ULg)