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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 detailMultiple-trait genomewide mapping and gene network analysis for scrotal circumference growth curves in Brahman cattle1
Soares, A. C. C.; Guimarães, S. E. F.; Kelly, M. J. et al

in Journal of Animal Science (2017), 95(8), 3331-3345

Fertility traits are economically important in cattle breeding programs. Scrotal circumference (SC) measures are repeatable, easily obtained, highly heritable, and positively correlated with female ... [more ▼]

Fertility traits are economically important in cattle breeding programs. Scrotal circumference (SC) measures are repeatable, easily obtained, highly heritable, and positively correlated with female fertility traits and sperm quality traits in males. A useful approach to summarize SC measures over time is using nonlinear models, which summarize specific measures of SC in a few parameters with biological interpretation. This approach facilitates the selection of bulls with larger SC and maturity index (K), that is, early maturing animals. Because SC is a sex-limited trait, identifying the underlying genomics of growth curve parameters will allow selection across both males and females. We reported the first multitrait genomewide association study (GWAS) of estimated growth curve parameters for SC data in Brahman cattle. Five widely used nonlinear models were tested to fit a total of 3,612 SC records, measured at 6, 12, 18, and 24 mo of age. The von Bertalanffy model, individually fitted for each animal, best fit this SC data. Parameter estimates SC at maturity (A) and K as well as SC at all ages were jointly analyzed in a GWAS to identify 1-Mb regions most strongly associated with each trait. Heritabilities were 0.25 for K and 0.32 for A and ranged from 0.51 to 0.72 for SC at 6 (SC6), 12 (SC12), 18 (SC18), and 24 mo of age (SC24). An overlapping window on chromosome 14 explaining around 0.8% of genetic variance for K, SC12, SC18, and SC24 was observed. The major positional candidate genes within 1 Mb upstream and downstream of this overlapping window were LYN, CHD7, RAB2A, and ARFGEF1. Windows of 1 Mb explaining more than 0.4% of each trait on chromosomes 1, 3, 6, 7, 14, 17, 18, 24, 25, and 26 were identified. Pathways and net-work analyses were indicated through transcription factors playing a role on fertility traits: SOX9, BRCA1, STAT3, NFE2L2, EGR1, PPARG, and NFKB1. Further validation studies on larger populations or other breeds are required to validate these findings and to improve our understanding of the biology and complex genetic architecture of traits associated with scrotal growth and male fertility in cattle. [less ▲]

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See detailExperimental and numerical investigation of the nonlinear dynamics of compliant mechanisms for deployable structures
Dewalque, Florence ULiege; Schwartz, Cédric ULiege; Denoël, Vincent ULiege et al

in Mechanical Systems & Signal Processing (2017), 101

This paper studies the dynamics of tape springs which are characterised by a highly geometrical nonlinear behaviour including buckling, the formation of folds and hysteresis. An experimental set-up is ... [more ▼]

This paper studies the dynamics of tape springs which are characterised by a highly geometrical nonlinear behaviour including buckling, the formation of folds and hysteresis. An experimental set-up is designed to capture these complex nonlinear phenomena. The experimental data are acquired by the means of a 3D motion analysis system combined with a synchronised force plate. Deployment tests show that the motion can be divided into three phases characterised by different types of folds, frequencies of oscillation and damping behaviours. Furthermore, the reproducibility quality of the dynamic and quasi-static results is validated by performing a large number of tests. In parallel, a nonlinear finite element model is developed. The required model parameters are identified based on simple experimental tests such as static deformed configurations and small amplitude vibration tests. In the end, the model proves to be well correlated with the experimental results in opposite sense bending, while in equal sense, both the experimental set-up and the numerical model are particularly sensitive to the initial conditions. [less ▲]

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See detailThe tails of the satellite auroral footprints at Jupiter
Bonfond, Bertrand ULiege; Saur, J.; Grodent, Denis ULiege et al

in Journal of Geophysical Research. Space Physics (2017), 122

The electro-magnetic interaction between Io, Europa and Ganymede and the rotating plasma that surrounds Jupiter has a signature in the aurora of the planet. This signature, called the satellite footprint ... [more ▼]

The electro-magnetic interaction between Io, Europa and Ganymede and the rotating plasma that surrounds Jupiter has a signature in the aurora of the planet. This signature, called the satellite footprint, takes the form of a series of spots located slightly downstream of the feet of the field lines passing through the moon under consideration. In the case of Io, these spots are also followed by an extended tail in the downstream direction relative to the plasma flow encountering the moon. A few examples of a tail for the Europa footprint have also been reported in the northern hemisphere. Here we present a simplified Alfvénic model for footprint tails and simulations of vertical brightness profiles for various electron distribution, which favour such a model over quasi-static models. We also report here additional cases of Europa footprint tails, in both hemispheres, even though such detections are rare and difficult. Furthermore, we show that the Ganymede footprint can also be followed by a similar tail. Finally, we present a case of a 320° long Io footprint tail, while other cases in similar configurations do not display such a length. [less ▲]

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See detailThe role of the tegument protein ORF9p and its phosphorylation status in VZV nuclear egress
Lebrun, Marielle ULiege; Blondeau, Caroline; Riva, Laura et al

Poster (2017, August 02)

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See detailPhytosterols-induced viscoelasticity of oleogels prepared by using monoglycerides
Bin Sintang, M.D.; Danthine, Sabine ULiege; Brown, A. et al

in Food Research International (2017), 100

Monoglycerides (MGs) and phytosterols (PS) are known to form firm oleogels with liquid oil. However, the oleogels are prone to undergo polymorphic transition over time that lead to crystals' aggregation ... [more ▼]

Monoglycerides (MGs) and phytosterols (PS) are known to form firm oleogels with liquid oil. However, the oleogels are prone to undergo polymorphic transition over time that lead to crystals' aggregation thus, compromises physical properties. Thus, we combined MGs with PS to control the crystallization and modify the morphology of the combination oleogels, as both components are reported to interact together. The oleogels were prepared at different ratio combinations and characterized in their rheological, thermal, morphology, and diffraction properties. The results showed that the 8:2 MGP:PS exhibited higher storage modulus (G′) than the MGP mono-component. The combination oleogels exhibited effects on the crystallization and polymorphic transition. Consequently, the effects led to change in the morphology of the combination oleogels which was visualized using optical and electron microscope. The resultant effect on the morphology is associated with crystal defect. Due to observable crystals of MGP and PS, it is speculated that the combination oleogels formed a mixed crystal system. This was confirmed with diffraction analysis in which the corresponding peaks from MGP and PS were observed in the combination oleogels. However, the 8:2 oleogel exhibited additional peak at 35.41 Å. Ultimately, the 8:2 was the optimum combination observed in our study. Interestingly, this combination is inspired by nature as sterols (phytosterols) are natural component of lipid membrane whilst MGP has properties similar to phospholipids. Hence, the results of our study not only beneficial for oil structuring, but also for the fields of biophysical and pharmaceutical. [less ▲]

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See detailLe rôle des petites entreprises du métier artisanal traditionnel dans le développement local: case d'étude dans le périphérie de Hanoi
Nguyen, Thi Thu Hien ULiege; Lebailly, Philippe ULiege; Nguyen, Van Nghien

in Science and Technology Journal of Agriculture & Rural Development (2017), 15

Rural industrial development and new rural development programmes are the main target of Vietnam in the process of industrialization – modernization of the country. To expedite this process, it is ... [more ▼]

Rural industrial development and new rural development programmes are the main target of Vietnam in the process of industrialization – modernization of the country. To expedite this process, it is necessary to promote the development and encourage the contributions of small enterprise in general and small enterprise rural in particular because practices in many countries show the important role of small and micro enterprises in local development. This paper presents the initial results of research to understand the economic–social contributions of rural enterprises to local development through the mobilization of local resources as well as establishment of the economic-social relations in local of rattan’s enterprises in the suburb of Hanoi, and then propose some measures to facilitate the operation of enterprises and promote the contribution of rattan’s enterprises for local development. [less ▲]

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See detailVizieR Online Data Catalog: Polarization of quasars (Hutsemekers+, 2017)
Hutsemekers, Damien ULiege; Hall, P.; Sluse, Dominique ULiege

Textual, factual or bibliographical database (2017)

This Table contains optical linear polarization measurements of 192 quasars obtained in April 2003, April 2007, and October 2007 with the ESO Faint Object Spectrograph and Camera (EFOSC2) instrument ... [more ▼]

This Table contains optical linear polarization measurements of 192 quasars obtained in April 2003, April 2007, and October 2007 with the ESO Faint Object Spectrograph and Camera (EFOSC2) instrument attached to the 3.6m telescope at the La Silla Observatory. (1 data file). [less ▲]

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See detailA New Solar Spectrum from 656 to 3088 nm
Meftah, M.; Damé, L.; Bolsée, D. et al

in Solar Physics (2017), 292

The solar spectrum is a key parameter for different scientific disciplines such as solar physics, climate research, and atmospheric physics. The SOLar SPECtrometer (SOLSPEC) instrument of the Solar ... [more ▼]

The solar spectrum is a key parameter for different scientific disciplines such as solar physics, climate research, and atmospheric physics. The SOLar SPECtrometer (SOLSPEC) instrument of the Solar Monitoring Observatory (SOLAR) payload onboard the International Space Station (ISS) has been built to measure the solar spectral irradiance (SSI) from 165 to 3088 nm with high accuracy. To cover the full wavelength range, three double-monochromators with concave gratings are used. We present here a thorough analysis of the data from the third channel/double-monochromator, which covers the spectral range between 656 and 3088 nm. A new reference solar spectrum is therefore obtained in this mainly infrared wavelength range (656 to 3088 nm); it uses an absolute preflight calibration performed with the blackbody of the Physikalisch-Technische Bundesanstalt (PTB). An improved correction of temperature effects is also applied to the measurements using in-flight housekeeping temperature data of the instrument. The new solar spectrum (SOLAR-IR) is in good agreement with the ATmospheric Laboratory for Applications and Science (ATLAS 3) reference solar spectrum from 656 nm to about 1600 nm. However, above 1600 nm, it agrees better with solar reconstruction models than with spacecraft measurements. The new SOLAR/SOLSPEC measurement of solar spectral irradiance at about 1600 nm, corresponding to the minimum opacity of the solar photosphere, is 248.08 ± 4.98 mW m[SUP]-2[/SUP] nm[SUP]-1[/SUP] (1 σ), which is higher than recent ground-based evaluations. [less ▲]

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See detailExergy analysis applied to performance of buildings in Europe
Sartor, Kevin ULiege; Dewallef, Pierre ULiege

in Energy and Buildings (2017), 148

Energy performance of buildings generally assesses the energy consumption of buildings such as heating, domestic heat water, ventilation systems, etc. However, this approach is based on the first law of ... [more ▼]

Energy performance of buildings generally assesses the energy consumption of buildings such as heating, domestic heat water, ventilation systems, etc. However, this approach is based on the first law of thermodynamics and considers only the quantity of energy used without considering its ‘quality’ and leads to a lack of information about the energy conversion processes. This is particularly true in the new low-energy buildings where sometimes high temperatures sources are used to meet low-temperature needs. The exergy analysis of a system, based on first and second thermodynamic laws, can be used to overcome this. In this work, it is proposed to compare the energy and the exergy consumption and the related CO2 emissions of several kinds of buildings to determine the best systems in terms of energy and exergy needs. The energy demand calculations are performed using the official software available in Belgium and some assumptions are implemented to consider the exergy approach. As exergy calculations require a reference state, some different climatic conditions are also investigated. Finally, some conclusions are discussed to rank the sources of energy and their related exergy losses. [less ▲]

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See detailThe inner structure of early-type galaxies in the Illustris simulation
Xu, Dandan; Springel, Volker; Sluse, Dominique ULiege et al

in Monthly Notices of the Royal Astronomical Society (2017), 469

Early-type galaxies provide unique tests for the predictions of the cold dark matter cosmology and the baryonic physics assumptions entering models for galaxy formation. In this work, we use the Illustris ... [more ▼]

Early-type galaxies provide unique tests for the predictions of the cold dark matter cosmology and the baryonic physics assumptions entering models for galaxy formation. In this work, we use the Illustris simulation to study correlations of three main properties of early-type galaxies, namely the stellar orbital anisotropies, the central dark matter fractions and the central radial density slopes, as well as their redshift evolution since z = 1.0. We find that lower mass galaxies or galaxies at higher redshift tend to be bluer in rest-frame colour, have higher central gas fractions, and feature more tangentially anisotropic orbits and steeper central density slopes than their higher mass or lower redshift counterparts, respectively. The projected central dark matter fraction within the effective radius shows a very mild mass dependence but positively correlates with galaxy effective radii due to the aperture effect. The central density slopes obtained by combining strong lensing measurements with single-aperture kinematics are found to differ from the true density slopes. We identify systematic biases in this measurement to be due to two common modelling assumptions, isotropic stellar orbital distributions and power-law density profiles. We also compare the properties of early-type galaxies in Illustris to those from existing galaxy and strong lensing surveys; we find in general broad agreement but also some tension, which poses a potential challenge to the stellar formation and feedback models adopted by the simulation. [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 detailSocial sustainability assessments in the biobased economy: Towards a systemic approach
Rafiaani, Parisa ULiege; Kuppens, Tom; Van Dael, Miet et al

in Renewable & Sustainable Energy Reviews (2017)

The majority of impact assessments for the biobased economy are primarily focused on the environmental and (techno-)economic aspects, while social aspects are rarely considered. This study proposes a ... [more ▼]

The majority of impact assessments for the biobased economy are primarily focused on the environmental and (techno-)economic aspects, while social aspects are rarely considered. This study proposes a modified systemic approach for a social sustainability impact assessment of the biobased economy, based on a review on the common methodologies for assessing social impacts. Accordingly, the proposed approach follows the four general iterative steps of social life cycle analysis (SLCA) as it considers all life cycle phases of the biobased economy. The systemic approach considers the potential social impacts on local communities, workers, and consumers as the main three groups of the stakeholders. The review showed that the most common social indicators for inventory analysis within the biobased economy include health and safety, food security, income, employment, land- and worker-related concerns, energy security, profitability, and gender issues. Multi-criteria decision analysis (MCDA) was also highlighted as the broadly utilized methodology for aggregating the results of impact assessments within the biobased economy. Taking a life cycle perspective, this study provides a holistic view of the full sustainability of research, design, and innovation in the biobased economy by suggesting the integration of the social aspects with techno-economic and an environmental life cycle assessment. Our proposed systemic approach makes possible to integrate the social impacts that are highly valued by the affected stakeholders into the existing sustainability models that focus only on environmental and techno-economic aspects. We discuss the steps of the proposed systemic approach in order to identify the challenges of applying them within the biobased economy. These challenges refer mainly to the definition of the functional unit and system boundaries, the selection and the analysis of social indicators (inventory analysis), the aggregation of the inventory to impact categories, and the uncertainties associated with the social sustainability evaluation. The result of this review and the proposed systemic approach serve as a foundation for industry and policy makers to gain a better insight into the importance of social sustainability impacts assessment within the biobased economy. [less ▲]

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See detailThe Far Ultra-Violet Imager on the Icon Mission
Mende, Stephen; Frey, Harald; Rider, Kodi et al

in Space Science Reviews (2017)

ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ ionosphere. During sunlit atmospheric ... [more ▼]

ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ ionosphere. During sunlit atmospheric conditions, ICON FUV images the limb altitude profile in the shortwave (SW) band at 135.6 nm and the longwave (LW) band at 157 nm perpendicular to the satellite motion to retrieve the atmospheric O/N2 ratio. In conditions of atmospheric darkness, ICON FUV measures the 135.6 nm recombination emission of O+ ions used to compute the nighttime ionospheric altitude distribution. ICON Far Ultra- Violet (FUV) imager is a Czerny–Turner design Spectrographic Imager with two exit slits and corresponding back imager cameras that produce two independent images in separate wavelength bands on two detectors. All observations will be processed as limb altitude profiles. In addition, the ionospheric 135.6 nm data will be processed as longitude and latitude spatial maps to obtain images of ion distributions around regions of equatorial spread F. The ICON FUV optic axis is pointed 20 degrees below local horizontal and has a steering mirror that allows the field of view to be steered up to 30 degrees forward and aft, to keep the local magnetic meridian in the field of view. The detectors are micro channel plate (MCP) intensified FUV tubes with the phosphor fiber-optically coupled to Charge Coupled Devices (CCDs). The dual stack MCP-s amplify the photoelectron signals to overcome the CCD noise and the rapidly scanned frames are co-added to digitally create 12-second integrated images. Digital on-board signal processing is used to compensate for geometric distortion and satellite motion and to achieve data compression. The instrument was originally aligned in visible light by using a special grating and visible cameras. Final alignment, functional and environmental testing and calibration were performed in a large vacuum chamber with a UV source. The test and calibration program showed that ICON FUV meets its design requirements and is ready to be launched on the ICON spacecraft. [less ▲]

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See detailThe discoveries of WASP-91b, WASP-105b and WASP-107b: Two warm Jupiters and a planet in the transition region between ice giants and gas giants
Anderson, D. R.; Collier Cameron, A.; Delrez, L. et al

in Astronomy and Astrophysics (2017), 604

We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 M[SUB]Jup[/SUB], 1.03 R[SUB]Jup[/SUB]) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm ... [more ▼]

We report the discoveries of three transiting exoplanets. WASP-91b is a warm Jupiter (1.34 M[SUB]Jup[/SUB], 1.03 R[SUB]Jup[/SUB]) in a 2.8-day orbit around a metal-rich K3 star. WASP-105b is a warm Jupiter (1.8 M[SUB]Jup[/SUB], 0.96 R[SUB]Jup[/SUB]) in a 7.9-day orbit around a metal-rich K2 star. WASP-107b is a warm super-Neptune/sub-Saturn (0.12 M[SUB]Jup[/SUB], 0.94 R[SUB]Jup[/SUB]) in a 5.7-day orbit around a solar-metallicity K6 star. Considering that giant planets seem to be more common around stars of higher metallicity and stars of higher mass, it is notable that the hosts are all metal-rich, late-type stars. With orbital separations that place both WASP-105b and WASP-107b in the weak-tide regime, measurements of the alignment between the planets' orbital axes and their stars' spin axes may help us to understand the inward migration of short-period, giant planets. The mass of WASP-107b (2.2 M[SUB]Nep[/SUB], 0.40 M[SUB]Sat[/SUB]) places it in the transition region between the ice giants and gas giants of the Solar System. Its radius of 0.94 R[SUB]Jup[/SUB] suggests that it is a low-mass gas giant with a H/He-dominated composition. The planet thus sets a lower limit of 2.2 M[SUB]Nep[/SUB] on the planetary mass above which large gaseous envelopes can be accreted and retained by proto-planets on their way to becoming gas giants. We may discover whether WASP-107b more closely resembles an ice giant or a gas giant by measuring its atmospheric metallicity via transmission spectroscopy, for which WASP-107b is a very good target. Based on observations made with: the WASP-South photometric survey instrument, the 0.6-m TRAPPIST robotic imager, and the EulerCam camera and the CORALIE spectrograph mounted on the 1.2-m Euler-Swiss telescope.The photometric time-series and radial-velocity data used in this work are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/A110</A> [less ▲]

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See detailThe EBLM project. III. A Saturn-size low-mass star at the hydrogen-burning limit
von Boetticher, Alexander; Triaud, Amaury H. M. J.; Queloz, Didier et al

in Astronomy and Astrophysics (2017), 604

We report the discovery of an eclipsing binary system with mass-ratio q ˜ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and ... [more ▼]

We report the discovery of an eclipsing binary system with mass-ratio q ˜ 0.07. After identifying a periodic photometric signal received by WASP, we obtained CORALIE spectroscopic radial velocities and follow-up light curves with the Euler and TRAPPIST telescopes. From a joint fit of these data we determine that EBLM J0555-57 consists of a sun-like primary star that is eclipsed by a low-mass companion, on a weakly eccentric 7.8-day orbit. Using a mass estimate for the primary star derived from stellar models, we determine a companion mass of 85 ± 4 M[SUB]Jup[/SUB] (0.081 M[SUB]⊙[/SUB]) and a radius of 0.84[SUP]+ 0.14[/SUP][SUB]-0.04[/SUB]R[SUB]Jup[/SUB] (0.084 R[SUB]⊙[/SUB]) that is comparable to that of Saturn. EBLM J0555-57Ab has a surface gravity log g[SUB]2[/SUB] =5.50[SUP]+ 0.03[/SUP][SUB]-0.13[/SUB] and is one of the densest non-stellar-remnant objects currently known. These measurements are consistent with models of low-mass stars. The photometry tables and radial velocities are only available at the CDS and on demand via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/604/L6</A> [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 detailThe quest for magnetic massive stars in the Magellanic Clouds
Nazé, Yaël ULiege; Bagnulo, S.; Walborn, N. R. et al

in The Lives and Death-Throes of Massive Stars (2017, August 01)

The Of?p category was introduced more than 40 years ago to gather several Galactic stars with some odd properties. Since 2000, spectropolarimetry, high-resolution spectroscopy, long-term photometry, and X ... [more ▼]

The Of?p category was introduced more than 40 years ago to gather several Galactic stars with some odd properties. Since 2000, spectropolarimetry, high-resolution spectroscopy, long-term photometry, and X-ray observations have revealed their nature: magnetic oblique rotators - they all have magnetic fields that confine their winds. Several Of?p stars have now been detected in the Magellanic Clouds, likely the prototypes of magnetic massive stars at low metallicity. This contribution will present the most recent photometric, spectroscopic, and spectropolarimetric data, along with the first modeling of these objects. [less ▲]

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See detailMolecular Tools for the Detection and Quantification of Toxigenic Cyanobacteria
Kurmayer, Rainer; Sivonen, Kaarina; Wilmotte, Annick ULiege et al

Book published by John Wiley and sons LTD - This edition first published 2017 (2017)

A guide to state-of-the-art molecular tools for monitoring and managing the toxigenicity of cyanobacteria Runaway climate change has made the monitoring and management of toxigenic organisms in the ... [more ▼]

A guide to state-of-the-art molecular tools for monitoring and managing the toxigenicity of cyanobacteria Runaway climate change has made the monitoring and management of toxigenic organisms in the world’s bodies of water more urgent than ever. In order to influence public policy regarding the detection and quantification of those organisms, it is incumbent upon scientists to clearly demonstrate to policy makers the increase of toxigenic cyanobacteria and the threats they pose. As molecular methods can handle many samples in short time, they are the most reliable, cost-effective tools currently available for tracking cyanotoxicity worldwide. This volume arms scientists with the tools they need to track toxigenicity in surface waters and food supplies and, hopefully, to develop new techniques for managing the spread of toxic cyanobacteria. This book offers the first comprehensive treatment of molecular tools for monitoring cyanotoxicity. Growing out of the findings of the landmark European Cooperation in Science and Technology Cyanobacteria project (CYANOCOST), it provides detailed, practical coverage of the full array of available molecular tools and protocols, from water sampling, nucleic acid extraction, and downstream analysis—including PCR and qPCR based methods—to genotyping (DGGE), diagnostic microarrays, and community characterization using next-gen sequencing techniques. [less ▲]

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