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See detailRemote control of self-assembled microswimmers
Grosjean, Galien ULg; Lagubeau, Guillaume ULg; Darras, Alexis ULg et al

in Scientific Reports (2015)

Floating magnetic particles can self-assemble into structures. These structures are periodically deformed in a non reciprocal way using magnetic fields, which leads to controllable low Reynolds number ... [more ▼]

Floating magnetic particles can self-assemble into structures. These structures are periodically deformed in a non reciprocal way using magnetic fields, which leads to controllable low Reynolds number locomotion. [less ▲]

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See detailInventer en littérature. Du poème en prose à l'écriture automatique
Bertrand, Jean-Pierre ULg

Book published by Le Seuil (2015)

Peut-on inventer en littérature ? Et qu’invente-t-on précisément ? Si ces questions, posées en regard de ce qui s'est produit à la même époque dans les sciences ou les techniques, ne cessent d’être ... [more ▼]

Peut-on inventer en littérature ? Et qu’invente-t-on précisément ? Si ces questions, posées en regard de ce qui s'est produit à la même époque dans les sciences ou les techniques, ne cessent d’être désavouées dans leur pertinence par les inventeurs eux-mêmes, probablement au nom d'une conception magique ou sacrée du littéraire, elles participent néanmoins d'une esthétique nouvelle qui se met en place au XIXe siècle. En effet, une théorie et une pratique de l'invention littéraire ? et pas simplement de l’inventivité ? apparaissent bel et bien, qui dépassent les dogmes anciens de l'imitation et de l'imagination comme principes organisateurs de la production artistique. Comme dans les sciences naturelles et les arts et métiers, on se met à inventer en littérature et à penser l'invention. On invente ainsi des cadres nouveaux ? genres, formes ou techniques ? qui se réclament d'un certain « progrès » de l’activité littéraire. En nous faisant assister à la naissance du poème en prose, du vers libre, du monologue intérieur, du calligramme et de l'écriture automatique, le présent essai cherche à comprendre les raisons pour lesquelles ces inventions deviennent les emblèmes des mouvements littéraires de la fin du romantisme à la naissance du surréalisme, mais également ce qui les relie et les sépare. [less ▲]

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See detailÀ Gênes autour de Boucicaut. L'armée royale française face à la révolte de 1409-1410
Masson, Christophe ULg

Conference (2015, November 04)

La fin de la puissance française à Gênes est marquée par une révolte qui renversa le pouvoir de Charles VI. Prenant la route de la capitale ligure, le gouverneur royal, le maréchal Jean Le Meingre, dit ... [more ▼]

La fin de la puissance française à Gênes est marquée par une révolte qui renversa le pouvoir de Charles VI. Prenant la route de la capitale ligure, le gouverneur royal, le maréchal Jean Le Meingre, dit Boucicaut, alors en Lombardie, regroupa autour de lui une armée composée de troupes françaises et piémontaises, le prince d'Achaïe et comte de Piémont étant à l'époque un de ses plus fidèles alliés, si pas le dernier en terre d'Italie. C'est à l'étude de cette société militaire particulière, organisée autour d'une personnalité et en perpétuelle recomposition – à la suite entre autres de l'envoi de renforts depuis Paris – que nous nous intéresserons dans le cadre de cette communication. Il s'agira dans un premier temps de dresser le profil de cette compagnie, en mettant avant tout en évidence la place que jouèrent dans son organisation les réseaux de sociabilité du maréchal de France – expérience des expéditions d'Orient, ordre de l'écu vert à la dame blanche... On y rencontrera certains des plus fidèles compagnons d'armes du maréchal, dont certains furent à ses côtés lors de la bataille d'Azincourt, tel Louis de Boisredont. Il s'agira donc non seulement d'identifier ces hommes d'armes, artisans ou clercs mais surtout de comprendre les raisons de leur présence aux côtés du maréchal. Dans un second temps, nous nous intéresserons à la pratique de la guerre qui fut celle de cette troupe, dans un terroir qui était presque parfaitement étrangers aux usages de la « guerre anglaise ». Comment celle-ci se définissait-elle et quelles furent ses originalités ? Il importera également de constater en quelle mesure celle-ci a pu peser sur les dernières années que Jean Le Meingre passa à combattre en France, et notamment sur son plan de bataille dressé à la veille de la bataille d'Azincourt. Cette communication tirera un grand profit non seulement des chroniques italiennes et des dépêches diplomatiques qui se firent l'écho de cette campagne mais surtout d'un document d'archive d'une valeur exceptionnelle, le compte KK 40 des Archives nationales, composé sur ordre de Boucicaut au lendemain de son retour en France en vue de se faire rembourser par Charles VI l'argent qu'il avança pour l'entretien de son armée. Celui-ci se trouve au cœur de nos recherches actuelles puisque nous travaillons actuellement à son édition qui, nous l'espérons, pourra être achevée et publiée au cours de l'année 2016. [less ▲]

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See detailVariation radiale de l'angle des microfibrilles de cellulose et de la longueur des trachéides chez le Douglas
Vaianopoulos, Céline; Hebert, Jacques ULg; Jourez, Benoît ULg

Poster (2015, November 04)

Le Douglas (Pseudotsuga menziesii) connaît depuis quelques décennies un essor important en Wallonie, du fait entre autre de son potentiel de croissance supérieur à celui de l’Epicéa. Néanmoins, la ... [more ▼]

Le Douglas (Pseudotsuga menziesii) connaît depuis quelques décennies un essor important en Wallonie, du fait entre autre de son potentiel de croissance supérieur à celui de l’Epicéa. Néanmoins, la sylviculture appliquée à cette essence est généralement calquée sur celle de l’Epicéa, ce qui ne permet pas nécessairement de profiter pleinement du potentiel de l’espèce. Aussi, pour guider l’action des sylviculteurs, une étude visant à évaluer l’impact de la vitesse de croissance sur les propriétés du bois de Douglas a été initiée. Il est admis aujourd’hui que l’angle des microfibrilles de cellulose (AMF) de la paroi des trachéides, ainsi que la longueur des trachéides, en complément de caractéristiques telles que la masse volumique, la largeur des cernes ou la texture, pourraient permettre d’expliquer plus finement le comportement mécanique du bois sans défaut. Afin de tenter de le démontrer, dans un premier temps, l’étude a porté sur les variations de l’AMF et de la longueur des trachéides au sein des arbres en fonction de différents paramètres : la largeur des cernes, l’âge du cerne, la position radiale et la hauteur dans l’arbre. Par la suite, ces résultats seront utilisés pour identifier les relations entre les propriétés mécaniques du bois et ses caractéristiques anatomiques. L’objectif final est de relier les caractéristiques de croissance avec les propriétés du bois produit et d’en déduire des recommandations sylvicoles. [less ▲]

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See detailMonitoring The quality Loss Performance of Products
Faraz, Alireza ULg; Treiblmaier, Horst

Conference (2015, November 03)

This paper presents a control chart based on the Taguchi (1986)’s loss function for monitoring the performance of a process and its capability in monetary form. The proposed chart monitors the loss due to ... [more ▼]

This paper presents a control chart based on the Taguchi (1986)’s loss function for monitoring the performance of a process and its capability in monetary form. The proposed chart monitors the loss due to poor quality to the society. The proposed control chart also allows for simultaneously monitoring both changes of the mean and variance. [less ▲]

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See detailHow do cumulative live birth rates and cumulative multiple live birth rates over complete courses of assisted reproductive technology treatment per woman compare among registries?
De Neubourg, Diane; Bogaerts, Kris; Blockeel, Christophe et al

in Human Reproduction (2015)

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See detailAdaptive Façades System Assessment: An initial review
Attia, Shady ULg; Favoino, Fabio; Loonen, Roel et al

in Advanced Building Skins (2015, November 03)

The assessment of adaptive facades presents a challenge because there is no established evaluation strategy to systematically reach this goal and many of the available building energy standards and codes ... [more ▼]

The assessment of adaptive facades presents a challenge because there is no established evaluation strategy to systematically reach this goal and many of the available building energy standards and codes have limited applicability for such advanced facades system. This paper reviews current evaluation methods for assessing adaptive facades system through a literature review. It also discusses occupant behaviour, post occupancy evaluation and commissioning issues and presents the procedures. The paper is part of the activities of Working Group 3 in COST Action TU1403 - Adaptive Facades Network. So far we could not find a protocol for assessment of adaptive facades. The reviewed literature is scattered lacking a focus on adaptive facades. There is no agreement on defining what are adaptive facades (sometimes named intelligent, smart, dynamic). We could define specialized technology monitoring techniques to assess the performance of technologies such as fabric-integrated solutions (e.g. electrochromic glazing, phase-change materials, building-Integrated Photovoltaics with heat recovery (BIPV/T, shade shutters) and advanced controls. The review is used to identify gaps in existing assessment methods and helps develop strategies for the holistic evaluation and assessment of adaptive facade systems as part of high performance buildings. [less ▲]

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See detailEssentials of actions
Cerfontaine, Benjamin ULg; Collin, Frédéric ULg; Denoël, Vincent ULg et al

Learning material (2015)

This document deals with the philosophy of safety in civil engineering structures, including loads and load combinations to be applied when designing a structure. It contains general concepts that are ... [more ▼]

This document deals with the philosophy of safety in civil engineering structures, including loads and load combinations to be applied when designing a structure. It contains general concepts that are presented and discussed as well as values for some important input data that can be used as order of magnitude in the initial phase of a project. [less ▲]

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See detailCrédit et Sûretés immobilières
Biquet, Christine ULg

Scientific conference (2015, November 02)

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See detailDo single, double or triple fungicide sprays differentially affect the grain quality in winter wheat?
El Jarroudi, Moussa ULg; kOUADIO, Louis; Junk et al

in Field Crops Research (2015), 183(257-266),

Foliar fungicides in wheat are typically used to safeguard against economic losses from diseases. In this study, we assessed the effects of three fungicide spray regimes [single, double, and triple ... [more ▼]

Foliar fungicides in wheat are typically used to safeguard against economic losses from diseases. In this study, we assessed the effects of three fungicide spray regimes [single, double, and triple treatments] on four different grain quality parameters [thousand grain weight (TGW), test weight (TW), grain protein content (GPC), and Zeleny sedimentation volume (ZSV)] during the 2006–2009 period at two sites in Luxembourg. The fungicides used were generally a mix of chlorothalonil and triazoles. At Burmerange, (cultivar Cubus), the values of TGW, TW, GPC and ZSV ranged from 38 to 62 g, 67 to 83 kg hl−1, 12.0% to 14.7% dry matter (DM), and 27 to 54 ml, respectively. Whereas, at Everlange (cultivar Achat), the ranges of TGW, TW, GPC and ZSV were 42 to 65 g, 65 to 81 kg hl−1, 11.0% to 15.0% DM, and 21 to 66 ml, respectively. In more than 75% cases, the results indicate that fungicides did not significantly affect TW or ZSV at either sites (P > 0.05). However, there was a significant and positive fungicide effect on GPC in 2006 and 2009 at Burmerange, and only in 2006 at Everlange (P < 0.05). On the contrary, TGW was significantly affected at Burmerange in all years, except 2008 when a positive increase was observed compared to control plots; and in 2006 and 2007 at Everlange. Interestingly, when there was an effect of fungicides on a quality parameter, there was no difference among different fungicide treatments. Thus under conditions prevailing in Luxembourg, a single fungicide treatment applied with judicious timing generally resulted in statistically similar grain quality parameters when compared with a double or triple fungicide treatment. [less ▲]

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See detailX-ray emission from the giant magnetosphere of the magnetic O-type star NGC 1624-2
Petit, V.; Cohen, D. H.; Wade, G. A. et al

in Monthly Notices of the Royal Astronomical Society (2015), 453

We observed NGC 1624-2, the O-type star with the largest known magnetic field (B[SUB]p[/SUB] ˜ 20 kG), in X-rays with the Advanced CCD Imaging Spectrometer (ACIS-S) camera on-board the Chandra X-ray ... [more ▼]

We observed NGC 1624-2, the O-type star with the largest known magnetic field (B[SUB]p[/SUB] ˜ 20 kG), in X-rays with the Advanced CCD Imaging Spectrometer (ACIS-S) camera on-board the Chandra X-ray Observatory. Our two observations were obtained at the minimum and maximum of the periodic Hα emission cycle, corresponding to the rotational phases where the magnetic field is the closest to equator-on and pole-on, respectively. With these observations, we aim to characterize the star's magnetosphere via the X-ray emission produced by magnetically confined wind shocks. Our main findings are as follows. (i) The observed spectrum of NGC 1624-2 is hard, similar to the magnetic O-type star θ[SUP]1[/SUP] Ori C, with only a few photons detected below 0.8 keV. The emergent X-ray flux is 30 per cent lower at the Hα minimum phase. (ii) Our modelling indicated that this seemingly hard spectrum is in fact a consequence of relatively soft intrinsic emission, similar to other magnetic Of?p stars, combined with a large amount of local absorption (˜1-3× 10[SUP]22[/SUP] cm[SUP]-2[/SUP]). This combination is necessary to reproduce both the prominent Mg and Si spectral features, and the lack of flux at low energies. NGC 1624-2 is intrinsically luminous in X-rays (log L^{em}_X˜ 33.4) but 70-95 per cent of the X-ray emission produced by magnetically confined wind shocks is absorbed before it escapes the magnetosphere (log L^{ISMcor}_X˜ 32.5). (iii) The high X-ray luminosity, its variation with stellar rotation, and its large attenuation are all consistent with a large dynamical magnetosphere with magnetically confined wind shocks. [less ▲]

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See detailX-Ray Emission from Massive Stars in Cyg OB2
Rauw, Gregor ULg; Nazé, Yaël ULg; Wright, N. J. et al

in Astrophysical Journal Supplement Series (2015), 221

We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources ... [more ▼]

We report on the analysis of the Chandra-ACIS data of O, B, and WR stars in the young association Cyg OB2. X-ray spectra of 49 O-stars, 54 B-stars, and 3 WR-stars are analyzed and for the brighter sources, the epoch dependence of the X-ray fluxes is investigated. The O-stars in Cyg OB2 follow a well-defined scaling relation between their X-ray and bolometric luminosities: log(Lx/Lbol)=-7.2+/- 0.2. This relation is in excellent agreement with the one previously derived for the Carina OB1 association. Except for the brightest O-star binaries, there is no general X-ray overluminosity due to colliding winds in O-star binaries. Roughly half of the known B-stars in the surveyed field are detected, but they fail to display a clear relationship between Lx and Lbol. Out of the three WR stars in Cyg OB2, probably only WR 144 is itself responsible for the observed level of X-ray emission, at a very low log(Lx/Lbol)=-8.8+/- 0.2. The X-ray emission of the other two WR-stars (WR 145 and 146) is most probably due to their O-type companion along with a moderate contribution from a wind–wind interaction zone. [less ▲]

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See detailFive years of comet narrow band photometry and imaging with TRAPPIST
Opitom, Cyrielle ULg; Jehin, Emmanuel ULg; Manfroid, Jean ULg et al

in Bulletin of the American Astronomical Society (2015, November 01), 47

TRAPPIST is a 60-cm robotic telescope in La Silla Observatory [1] mainly dedicated to the study of exoplanets and comets. The telescope is equipped with a set of narrow band cometary filters designed by ... [more ▼]

TRAPPIST is a 60-cm robotic telescope in La Silla Observatory [1] mainly dedicated to the study of exoplanets and comets. The telescope is equipped with a set of narrow band cometary filters designed by the NASA for the Hale-Bopp observing campaign [2]. Since its installation in 2010, we gathered a high quality and homogeneous data set of more than 30 bright comets observed with narrow band filters. Some comets were only observed for a few days but others have been observed weekly during several months on both sides of perihelion. From the images, we derived OH, NH, CN, C[SUB]2[/SUB], and C[SUB]3[/SUB] production rates using a Haser [3] model in addition to the Afρ parameter as a proxy for the dust production. We computed production rates ratios and the dust color for each comet to study their composition and followed the evolution of these ratios and colors with the heliocentric distance.The TRAPPIST data set, rich of more than 10000 images obtained and reduced in an homogeneous way, allows us to address several fundamental questions such as the pristine or evolutionary origin of composition differences among comets. The evolution of comet activity with the heliocentric distance, the differences between species, and from comet to comet, will be discussed. Finally, the first results about the one year campaign on comet C/2013 US10 (Catalina) and our recent work on the re-determination of Haser scalelengths will be presented.[1] Jehin et al., The Messenger, 145, 2-6, 2011[2] Farnham et al., Icarus, 147, 180-204, 2000[3] Haser, Bulletin de l’Académie Royal des Sciences de Belgique,63, 739, 1957 [less ▲]

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See detailNitrogen Isotopic Ratios in Cometary NH2: Implication for 15N-fractionation in Ammonia
Shinnaka, Yoshiharu; Kawakita, Hideyo; Jehin, Emmanuel ULg et al

in Bulletin of the American Astronomical Society (2015, November 01), 47

Isotopic ratios in cometary molecules are diagnostic for the physico-chemical conditions where molecules formed and are processed, from the interstellar medium to the solar nebula. Usually temperatures at ... [more ▼]

Isotopic ratios in cometary molecules are diagnostic for the physico-chemical conditions where molecules formed and are processed, from the interstellar medium to the solar nebula. Usually temperatures at the molecular formation control the fractionation of the heavier element in molecular species, e.g., D-fractionation in water.In cometary volatiles, the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in CN have been well observed (Manfroid et al. 2009, A&A, 503, 613, and reference therein) and is consistent with the ratio in HCN (a most probable parent of CN) measured in few comets (Bockelée-Morvan et al. 2008, ApJ, 679, L49). Those ratios are enriched compared to the proto-solar value by a factor of ~3. In contrast to those Nitriles, there are only few reports on [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in Ammonia (as Amine) (Rousselot et al. 2014, ApJ, 780, L17; Shinnaka et al. 2014, ApJ, 782, L16). Ammonia (NH[SUB]3[/SUB]) is usually the most abundant and HCN is the second most abundant N-bearing volatiles in cometary ice. Especially, recent observations of [SUP]15[/SUP]NH[SUB]2[/SUB] revealed the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in NH[SUB]3[/SUB] are comparable to those of CN. However, from the viewpoint of theoretical work, the enrichment of [SUP]15[/SUP]N in cometary NH[SUB]3[/SUB] cannot be reproduced by current chemical network models. Information about the diversity of the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in NH[SUB]3[/SUB] of individual comets is needed to understand the formation mechanisms/environments of NH[SUB]3[/SUB] in the early solar system.To clarify the diversity of the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in cometary NH[SUB]3[/SUB], we determine the [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in NH[SUB]3[/SUB] for more than ten comets individually which include not only Oort cloud comets but also short period comets by using the high-resolution optical spectra of NH[SUB]2[/SUB]. These spectra were obtained with both the UVES mounted on the VLT in Chile and the HDS on the Subaru Telescope in Hawaii.The derived [SUP]14[/SUP]N/[SUP]15[/SUP]N ratios in NH[SUB]3[/SUB] for more than ten comets show high [SUP]15[/SUP]N-enrichment compared with the elemental abundances of nitrogen in the Sun by about factor of ~3 and has no large diversity depending on these dynamical properties. We discuss about the origin of the formation conditions of cometary NH[SUB]3[/SUB] and its physico-chemical evolution in the solar nebula based on our and other results.This work was supported by JSPS, 15J10864 (Y. Shinnaka). [less ▲]

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See detailPostures et figures « néo-réactionnaires ». Autour d'un personnage collectif
Durand, Pascal ULg; Sindaco, Sarah ULg

in COnTEXTES : Revue de Sociologie de la Littérature (2015)

Rendre compte du courant dit des « nouveaux réactionnaires » en dressant le portrait du personnage collectif qui lui sert de support tient ici d’une mesure de prudence autant que d’un choix de méthode, à ... [more ▼]

Rendre compte du courant dit des « nouveaux réactionnaires » en dressant le portrait du personnage collectif qui lui sert de support tient ici d’une mesure de prudence autant que d’un choix de méthode, à la faveur d’une double distance créée avec l’objet : distance historique pour commencer, même si celle-ci tendra à se resserrer progressivement autour dudit objet ; distance assurée d’un autre côté par un effort d’abstraction des régularités en fait de rhétorique et de posture caractéristiques du phénomène examiné dans son ensemble. Un phénomène à la fois social et discursif dont les conditions de possibilité et d’efficacité intéresse davantage le propos du présent article que les contenus polémiques dont il se nourrit et les fortes individualités dont il se soutient [less ▲]

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See detailObservations of radio-quiet quasars at 10-mas resolution by use of gravitational lensing
Jackson, Neal; Tagore, Amitpal S.; Roberts, Carl et al

in Monthly Notices of the Royal Astronomical Society (2015), 454

We present Very Large Array detections of radio emission in 4 four-image gravitational lens systems with quasar sources: HS 0810+2554, RX J0911+0511, HE 0435-1223 and SDSS J0924+0219, and extended Multi ... [more ▼]

We present Very Large Array detections of radio emission in 4 four-image gravitational lens systems with quasar sources: HS 0810+2554, RX J0911+0511, HE 0435-1223 and SDSS J0924+0219, and extended Multi-Element Remote Linked Interferometer (e-MERLIN) observations of two of the systems. The first three are detected at a high level of significance, and SDSS J0924+0219 is detected. HS 0810+2554 is resolved, allowing us for the first time to achieve 10-mas resolution of the source frame in the structure of a radio-quiet quasar. The others are unresolved or marginally resolved. All four objects are among the faintest radio sources yet detected, with intrinsic flux densities in the range 1-5 μJy; such radio objects, if unlensed, will only be observable routinely with the Square Kilometre Array. The observations of HS 0810+2554, which is also detected with e-MERLIN, strongly suggest the presence of a mini active galactic nucleus, with a radio core and milliarcsecond scale jet. The flux densities of the lensed images in all but HE 0435-1223 are consistent with smooth galaxy lens models without the requirement for smaller scale substructure in the model, although some interesting anomalies are seen between optical and radio flux densities. These are probably due to microlensing effects in the optical. [less ▲]

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