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See detailBanana macropropagation: an alternative way of producing seedlings for the farmers in Burundi
Nintije, Pierre ULg; De Clerck, Caroline ULg; Bigirimana, Joseph et al

Poster (2012, May 22)

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See detailThe BANANA Project. V. Misaligned and Precessing Stellar Rotation Axes in CV Velorum
Albrecht, Simon; Winn, Joshua N.; Torres, Guillermo et al

in Astrophysical Journal (2014), 785

As part of the Binaries Are Not Always Neatly Aligned project (BANANA), we have found that the eclipsing binary CV Velorum has misaligned rotation axes. Based on our analysis of the Rossiter-McLaughlin ... [more ▼]

As part of the Binaries Are Not Always Neatly Aligned project (BANANA), we have found that the eclipsing binary CV Velorum has misaligned rotation axes. Based on our analysis of the Rossiter-McLaughlin effect, we find sky-projected spin-orbit angles of β[SUB]p[/SUB] = -52° ± 6° and β[SUB]s[/SUB] = 3° ± 7° for the primary and secondary stars (B2.5V + B2.5V, P = 6.9 days). We combine this information with several measurements of changing projected stellar rotation speeds (vsin i [SUB]sstarf[/SUB]) over the last 30 yr, leading to a model in which the primary star's obliquity is ≈65°, and its spin axis precesses around the total angular momentum vector with a period of about 140 yr. The geometry of the secondary star is less clear, although a significant obliquity is also implicated by the observed time variations in the vsin i [SUB]sstarf[/SUB]. By integrating the secular tidal evolution equations backward in time, we find that the system could have evolved from a state of even stronger misalignment similar to DI Herculis, a younger but otherwise comparable binary. Based on observations made with ESOs 2.2 m Telescopes at the La Silla Paranal Observatory under programme ID 084.C-1008 and under MPIA guaranteed time. [less ▲]

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See detailBanana Streak Virus activation by tissue culture in natural interspecific banana hybrids
NINTIJE, Pierre

Poster (2012, February 10)

Banana and plantains are important in Burundi as a staple food crop and source of income for farmers. Nevertheless, their productions are threatened by pathogens among which viruses are especially harmful ... [more ▼]

Banana and plantains are important in Burundi as a staple food crop and source of income for farmers. Nevertheless, their productions are threatened by pathogens among which viruses are especially harmful. Elimination procedures of viruses are mainly performed by banana tissue culture techniques (TC) giving good sanitation results for most bananas’ viruses. However, Banana Streak Virus (BSV) a pararetrovirus is activated by TC for banana with the B genome. Therefore, there is a risk of encouraging the emergence of BSV in Burundi by the distribution of TC products to growers. In this work, we studied the activation of BSV by tissue culture in 5 banana cultivars collected in Burundi and micropropagated in vitro. The BSV activation was demonstrated in 4 cultivars using molecular tools. [less ▲]

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See detailBanana-Mycosphaerella fijiensis interactions.
Lepoivre, Philippe ULg; Busogoro, Jean-Pierre; Etame, Jean-Jacques et al

in Mycosphaerella leaf spot diseases of bananas: presentstatus and outlook. Proceedings of the 2nd International Workshop on Mycosphaerella leaf spot diseases held in San Jose, Costa Rica on20-23 May 2002 (2003)

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See detailLa banane: de la récolte à la consommation
De Clerck, Caroline ULg; Lassois, Ludivine ULg

Diverse speeche and writing (2010)

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See detailLa banane: de son origine à sa commercialisation
Lassois, Ludivine ULg; Busogoro, J. P.; Jijakli, Haissam ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2009), 13(4), 575-586

Cultivated bananas are giant herbaceous plants within the genus Musa. They are both sterile and parthenocarpic. There are well over a thousand domesticated Musa cultivars, they are mostly triploid (a few ... [more ▼]

Cultivated bananas are giant herbaceous plants within the genus Musa. They are both sterile and parthenocarpic. There are well over a thousand domesticated Musa cultivars, they are mostly triploid (a few are diploid or tetraploid) and are derived from crosses between two wild species, Musa acuminata and Musa balbisiana. In terms of production, bananas are the fourth agricultural product after rice, wheat, and maize. They constitute the basis of food security for many people. Cropping systems vary widely around the world and contrasting objectives are encountered: consumption by the producer, sale on local or national markets, export, etc. Cooking bananas, including plantains, must be distinguished from dessert bananas, which constitute a major international trade. This international trade started only in the early 1900s but it has since grown continuously. Banana is currently the most exported fruit, in terms of both value and quantity. Despite the high genetic diversity found within the genus Musa, the export market is mainly based on single Cavendish. There are major challenges to banana production from biotic or abiotic stresses to continue to meet the criteria of sustainability, quality and yield that are imposed. [less ▲]

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See detailLe bananier: comment obtenir du matériel de plantation indemne de virus
De Clerck, Caroline ULg; Lassois, Ludivine ULg

Diverse speeche and writing (2010)

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See detaille bananier: de la plantation à la récolte
De Clerck, Caroline ULg; Lassois, Ludivine ULg

Diverse speeche and writing (2010)

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See detailBanc polarimétrique de mesure de masques de phase pour la coronographie
Piron, Pierre ULg

Master's dissertation (2009)

Ce travail comprend deux parties. La première partie replace la coronographie dans son contexte historique (détection des exoplanètes) et scientifique (différentes théories physiques et leur développement ... [more ▼]

Ce travail comprend deux parties. La première partie replace la coronographie dans son contexte historique (détection des exoplanètes) et scientifique (différentes théories physiques et leur développement mathématique). Elle présente les qualités et les défauts des différents masques utilisés dans les coronographes. A l’origine, la coronographie est une technique utilisée en astronomie pour reproduire une éclipse totale de soleil. Depuis la découverte de la première exoplanète en 1995, la coronographie est en pleine (r)évolution : elle s’efforce de donner une image d’un compagnon faible qui orbite autour d’une étoile brillante. Grâce à la spectroscopie, une image peut fournir des informations inaccessibles aux autres méthodes de détection (présence d’eau, de vie, ...). La chromaticité (dépendance à la longueur d’onde de travail) est le défaut le plus gênant pour un masque coronographique ; les chercheurs rivalisent donc d’ingéniosité pour améliorer sans cesse les performances et repousser toujours plus loin les limites instrumentales. Dans les années 2000, les masque de phase apparaissent : ils produisent un déphasage soit par différence de chemin optique (masques chromatiques : DPM, 4QPM) soit par opposition de phase entre les composantes électrique et magnétique de la lumière (masques achromatiques : 4QAPS, 4ZOG, AGPM). L’interférence destructive due au déphasage provoque l’atténuation totale ou partielle d’une source lumineuse centrée (une étoile). Par contre, la lumière d’une source décentrée (une étoile faible voisine, une planète qui orbite autour de l’étoile) n’est pas ou peu atténuée. Ce principe explique le rôle joué par la coronographie dans la détection des exoplanètes. Grâce à leur biréfringence de forme, les réseaux sublambda de type ZOG créent une différence de phase entre les composantes électrique et magnétique de la lumière. Le masque de phase à quatre quadrants 4ZOG est formé de quatre ZOGs orientés pour créer une opposition de phase entre deux quadrants adjacents. L’Annular Groove Phase Mask (AGPM) est un réseau ZOG "space-variant" qui génère un vortex optique avec une interférence destructive au centre. L’optimisation de la configuration spatiale d’un ZOG (pas du réseau, profondeur de gravure, facteur de remplissage, ...) améliore ses performances optiques mais une erreur sur le déphasage est toujours possible. Elle est due au manque de précision lors de la fabrication par lithographie. Le défi actuel à relever est de trouver une technologie de fabrication plus fiable : les Liquid Crystal Polymers semblent prometteurs. La deuxième partie est plus pratique : elle présente le banc de mesure mis au point à l’Hololab de la Faculté des Sciences de l’Université de Liège. Il est prévu pour travailler dans les bandes infrarouges H et K qui sont couramment utilisées en astronomie, notamment pour la détection des exoplanètes. Il est destiné à mesurer le déphasage produit par les retardateurs de phase (phase shifters), entre autres, les masques de phase utilisés en coronographie : des plus simples (lames quart d’onde, lames demi-ondes) aux plus sophistiqués (masques de phase de type ZOG) en passant par les rhomboèdres de Fresnel (réflection totale interne). Cette partie décrit les différents composants et leur mise au point initiale, le principe polarimétrique de son fonctionnement, le programme LabVIEW qui commande les polariseurs mobiles et la prise de mesure par le détecteur, les modules MATLAB qui traitent les données, les limites actuelles à son fonctionnement (vitesse de fonctonnement, précision des mesures, stabilité des mesures, ...) Un chapitre présente les résultats expérimentaux obtenus pour quelques échantillons testés : une lame quart d’onde avec le laser à 1.55 m, la même lame avec le laser à 2.3 m, un rhomboèdre de Fresnel avec le laser à 1.55 m. [less ▲]

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See detailLes bancs rouges de l'assise de Montfort dans l'est du synclinorium de Dinant : leur origine et leur valeur comme moyen de corrélation lithologique
Ek, Camille ULg

in Annales de la Société Géologique de Belgique (1963), 86(6), 325-344

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See detailLes bancs solaires au banc des accusés.
Uhoda, I.; Petite, Louicette ULg; Pierard, Claudine ULg et al

in Revue Médicale de Liège (2002), 57(1), 29-32

Sunbeds used in sun parlours do not garantee a controlled innocuity. By contrast, health hazards are obvious in many instances. Forceful tanning is a transitory aspect behind which the spectrum of many ... [more ▼]

Sunbeds used in sun parlours do not garantee a controlled innocuity. By contrast, health hazards are obvious in many instances. Forceful tanning is a transitory aspect behind which the spectrum of many skin changes includes accelerated photoageing, irreversible pigmentary and keratotic changes, and cutaneous malignancies including malignant melanoma. In the absence of protection, the eye is also affected. Even if tanning salon exposure increases the risk for skin cancer by a small amount, it represents a significant potential public health hazard given the number of people attending salons. Digital dermoscopy and ultraviolet light videoscopy are new methods allowing to predict the cutaneous ransom to be paid by the sunbed worshippers. [less ▲]

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See detailBand structure modulation of ZnSe/ZnTe nanowires under strain
Pekoz, Rengin; Raty, Jean-Yves ULg

in Physical Review. B, Condensed Matter and Materials Physics (2011), 84(16), 1654448-16544481654448

First-principles calculations have been used to investigate the structural and electronic properties of unpassivated ZnSe, ZnTe and ZnX/ZnY [X = Se(Te),Y = Te(Se)] core/shell nanowires oriented along the ... [more ▼]

First-principles calculations have been used to investigate the structural and electronic properties of unpassivated ZnSe, ZnTe and ZnX/ZnY [X = Se(Te),Y = Te(Se)] core/shell nanowires oriented along the [111] direction with hexagonal cross sections. The effects of quantum confinement and strain on the electronic properties of the nanowires have been explored for different diameters and core/shell thicknesses. We observe that strong band structure modulation is achievable through uniaxial strain. While for ZnTe nanowires, compression induces a direct-to-indirect band transition for diameters larger than 1.4 nm, there is no sign for a similar transition either for single component ZnSe or core/shell nanowires. The wave function analysis reveals a strong preference for localizing the electron states inside ZnSe rich regions. [less ▲]

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See detailBand-by-band decompositions of the Born effective charges
Ghosez, Philippe ULg; Gonze, X.

in Journal of Physics : Condensed Matter (2000), 12(43), 9179-9188

The Born effective charge, Z*, that describes the polarization created by collective atomic displacements, can be computed from first principles following different techniques. We establish the ... [more ▼]

The Born effective charge, Z*, that describes the polarization created by collective atomic displacements, can be computed from first principles following different techniques. We establish the connections existing between these different formulations, and analyse the related band-by-band decompositions. We show that unlike for the full Z*, the different band-by-band values are not equal, and emphasize that one of them has a natural physical meaning in terms of Wannier functions. [less ▲]

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See detailBande dessinée alternative : mémoire et re-génération. Autour de l'exposition "Alternatif Chaos. Onafhankelijk Beeldverhaal in Wallonië en Brussel"
Dejasse, Erwin ULg

in Textyles : Revue des Lettres Belges de Langue Française (2010), 36-37

The article deals about the exhibition "Alternative Chaos" that took place in 2008 in Haarlem -Netherland whom I was the curator. I've tried to analyse it retrospectively. This exhibition was devoted to ... [more ▼]

The article deals about the exhibition "Alternative Chaos" that took place in 2008 in Haarlem -Netherland whom I was the curator. I've tried to analyse it retrospectively. This exhibition was devoted to the alternative scene of Comics in French speaking Belgium between 1988 and 2008. [less ▲]

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See detailLa bande dessinée belge avant Hergé. Quelle histoire ?
Paques, Frédéric ULg

in Comicalités : Études de Culture Graphique (2012, April 11)

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See detailLa bande dessinée belge hier et aujourd’hui
Paques, Frédéric ULg

Scientific conference (2009, March 24)

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See detailLa Bande dessinée en Belgique : les heures des gloire des journaux Spirou et Tintin
Dejasse, Erwin ULg

Conference given outside the academic context (2009)

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See detailLa Bande dessinée en Belgique francophone : ruptures et réinventions
Dejasse, Erwin ULg

Scientific conference (2012, October 30)

The lecture tries to feature the mainlines of today's Belgian Comics

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See detailLa bande dessinée en dissidence : alternative, indépendance, auto-édition / Comics in Dissent: Alternative, Independence, Self-Publishing
Dony, Christophe ULg; Habrand, Tanguy ULg; Meesters, Gert

Book published by Presses Universitaires de Liège (2014)

This volume investigates the complex notion of dissent as it can be applied to contemporary comics in confronting field and market logic, legitimation strategies, and social, cultural, political and ... [more ▼]

This volume investigates the complex notion of dissent as it can be applied to contemporary comics in confronting field and market logic, legitimation strategies, and social, cultural, political and aesthetic discourses. How do artists and/or publishing structures distance themselves from a certain idea of the established order? In what ways do they challenge the existing systems and environments in which they operate? How can we characterize the many guises and sometimes conflicting objectives of a generally self-conscious (counter-)culture? And what kinds of symbolic exchanges can we observe between artistic and critical discourses? These are some of the questions that the here gathered essays explore in considering the practices and strategies of either so-called and/or selfproclaimed independent or alternative comics artists or publishers. [less ▲]

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See detailLa Bande dessinée est un sport de combat : bande dessinée, art brut et art contemporain
Dejasse, Erwin ULg; Rouche, Anne-Françoise; Van Hasselt, Thierry

Conference given outside the academic context (2011)

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