Les Nymphes de Diane: Cantate à deux voix. Réduction clavier

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Identités de Macdonald, formule de dénominateur de Weyl-Kac et grassmannienes affines

We expand the affine Weyl denominator formulas as signed $q$-series ofordinary Weyl characters running over the affine Grassmannian. Herethe grading in $q$ coincides with the (dual) atomic length of the rootsystem considered as introduced by Chapelier-Laget and Gerber. Next, wegive simple expressions of the atomic lengths in terms of self-conjugatecore partitions.\ This permits in particular to rederive, from the general theory of affine rootsystems, some results of the second author obtained by case-by-case computations on determinants and the use of particular families of strictpartitions. These families are proved to be in simple one-to-one correspondences withthe previous core partition model and, through this correspondence, the atomic length on cores equates the rank of the strict partitions considered. Finally, we make explicit some interactions between the affine Grassmannian elements and the Nekrasov-Okounkov type formulas

Rabelais et l’atelier de Baldassare Peruzzi (1481-1536)

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Interruptions at work and (counter) productivity: The mediating role of psychological need unfulfillment

International audiencePurpose When employees complete their work tasks, they often experience intrusions stemming from the work (professional intrusions) or the home domain (personal intrusions). Yet, little is known about the respective implications of these two types of intrusions for employees’ productivity. This paper aims to investigate how professional and personal intrusions at work relate to the bright (perceived performance) and dark (procrastination) sides of employees' productivity. Based on recent advances in Self-Determination Theory, the authors also examined the mediating role of psychological need unfulfillment in these relations. Design/methodology/approach The authors relied on a cross-sectional survey design. A total of 229 French employees took part in the study. Findings Results from structural equation modelling indicated that need unfulfillment mediated the negative association between personal intrusions and employees’ performance and the positive relation between personal intrusions and procrastination. Professional intrusions were positively related to the soldiering dimension of procrastination only. Originality/value This study sheds light on the differentiated effects of personal and professional intrusions, while uncovering the psychological mechanisms at play. Personal intrusions, by triggering employees’ need unfulfillment, were found to have more extended detrimental consequences than professional intrusions. To the best of the authors’ knowledge, this research is also the first to demonstrate the mediating role of need unfulfillment in the relations between socio-contextual characteristics and individual functioning, and thus contributes to Self-Determination Theory

Réexamen des déterminants et du calcul du Net Promoter Score (NPS) : une investigation empirique dans le secteur de la distribution

International audienceWhile the Net Promoter Score (NPS) is widely used by marketing professionals, the academic world is taking a critical look at this indicator. Researchers are questioning both the way this indicator is calculated and the mechanisms that can be used to improve NPS. In this context, the research objective is twofold: (i) to compare the ability of three factors –satisfaction, commitment and perceived value– to predict NPS, these factors having always been tested independently of each other, (ii) to compare different ways of calculating this indicator. The empirical study of 462 customers of a store (specializing in the distribution of cultural and electronic products for the general public) shows that satisfaction and perceived value of the store visit are excellent predictors of NPS, while engagement has a low predictive capacity. The results invite researchers and practitioners to systematically associate an analytical construct (such as perceived value) with the use of an NPS measure in order to understand the formation of this score. This research also contributes to the scientific debate on the method for calculating NPS.Alors que bon nombre de professionnels en marketing utilisent couramment le Net Promoter Score (NPS), le monde académique porte un regard critique sur cet indicateur. Les chercheurs questionnent à la fois son mode de calcul et les mécanismes qui peuvent permettre d’améliorer le NPS. Dans ce contexte, l’objectif de cette recherche est double : i. comparer la capacité de trois facteurs –la satisfaction, l’engagement et la valeur perçue– à prédire le NPS, ces facteurs ayant toujours été testés indépendamment les uns des autres, ii. comparer différents modes de calcul de cet indicateur. L’étude empirique, menée auprès de 462 clients d’un magasin spécialisé dans la distribution de produits culturels et électroniques à destination du grand public, montre que la satisfaction et la valeur perçue de la visite du point de vente sont d’excellents prédicteurs du NPS tandis que l’engagement a une capacité prédictive faible. Les résultats invitent chercheurs et praticiens à systématiquement associer un construit analytique (comme la valeur perçue) à l’emploi d’une mesure NPS afin de comprendre la formation de ce score. Par ailleurs, cette recherche permet d’alimenter le débat scientifique sur la méthode de calcul du NPS

Welfare issues in goat farming and management

International audienceGoats are raised in a wide range of production systems all around the world. Whatever the system, different aspects of the farming management can affect the welfare of goats, namely management of the relationships with social peers and humans, kids’ management, outdoor access, and milking, reproduction and genetics management. In this chapter, each of these management aspects is discussed with regard to the risks of impairing the welfare of goats and the strategies to mitigate their stress by better fitting the farming management to the behavioural and physiological needs of goats. In addition to stress mitigation, this chapter also highlights the possibility throughout management practices to elicit positive emotional experiences to induce positive welfare in goats. In tandem, the positive effects of facilitating positive welfare of goats on the quality of life at work for the farmer are reported, illustrating the interrelationships between human wellbeing and animal welfare. Recent scientific knowledge in behavioural and social needs of goats and their cognitive abilities should be better taken into account to develop good practice guidelines and specific regulations to ensure more welfare-friendly goat farming systems

What makes tablet‐based learning effective? A study of the role of real‐time adaptive feedback

International audiencehis study investigated the added value of real-time adaptive feedback on seventh graders' performances in tablet-based geometry learning. To isolate the effects of the medium (ie, tablet) from those of the feedback, three groups were compared: paper-and-pencil, pen-based tablet without feedback and pen-based tablet with feedback. The feedback was provided by a tutoring system based on an artificial intelligence that automatically interpreted students' pen strokes on the screen. A total of 85 French students drew three geometric shapes, either on paper or on a tablet, and then performed a transfer task on paper. Results showed that using a tablet without feedback did not improve learning but seemed to enhance interest in the task compared to the paper-and-pencil group. Students in the tablet with feedback group performed significantly better than the other two groups on learning, as well as on transfer. This study was the first to combine media comparison and added-value approaches to test the effects on students' geometry performances of using a new educational app on a pen-based tablet in a naturalistic classroom environment. Results showed that it was not the medium used but the intelligent tutoring system-based feedback that improved students' performance. Our data therefore indicate that artificial intelligence is a promising way of providing learners with real-time adaptive feedback in order to improve their performances.his study investigated the added value of real-time adaptive feedback on seventh graders' performances in tablet-based geometry learning. To isolate the effects of the medium (ie, tablet) from those of the feedback, three groups were compared: paper-and-pencil, pen-based tablet without feedback and pen-based tablet with feedback. The feedback was provided by a tutoring system based on an artificial intelligence that automatically interpreted students' pen strokes on the screen. A total of 85 French students drew three geometric shapes, either on paper or on a tablet, and then performed a transfer task on paper. Results showed that using a tablet without feedback did not improve learning but seemed to enhance interest in the task compared to the paper-and-pencil group. Students in the tablet with feedback group performed significantly better than the other two groups on learning, as well as on transfer. This study was the first to combine media comparison and added-value approaches to test the effects on students' geometry performances of using a new educational app on a pen-based tablet in a naturalistic classroom environment. Results showed that it was not the medium used but the intelligent tutoring system-based feedback that improved students' performance. Our data therefore indicate that artificial intelligence is a promising way of providing learners with real-time adaptive feedback in order to improve their performances

λ\lambda-Griffiths polynomials: Bispectrality and biorthogonality

International audienceWe introduce a generalization of bivariate Griffiths polynomials depending onan additional parameter $\lambda$. These $\lambda$-Griffiths polynomials arebivariate, bispectral and biorthogonal. For two specific values of theparameter $\lambda$, they become orthogonal. One of the value is related to theusual bivariate Griffiths polynomials, while the second value produces neworthogonal bivariate polynomials

Syrian refugee settlement in Irbid and urban fragmentation: A case study of Ḥay āl-Afrāḥ and its surroundings

International audienc

UE-Celac 2023 : le sommet de l’incompréhension mutuelle

International audienceLe dernier sommet de l’Union européenne (UE) et de la Communauté d’Etats latino-américains et des Caraïbes (Celac) s’est tenu les 17 et 18 juillet 2023 à Bruxelles. Il a réuni, pour la première fois depuis 2015, l’ensemble des chefs d’Etats et de gouvernements des deux organisations régionales. A l’issue de cette rencontre diplomatique de haut niveau, une déclaration finale, comprenant 41 points, a été approuvée par l’ensemble des pays, à l’exception du Nicaragua. Une « feuille de route », incluant une liste indicative d’évènements bi-régionaux prévus pour la période 2023-2025, a également été présentée. Au-delà de cette déclaration politique, ce sommet a témoigné d’une relation UE-Amérique latine en pleine mutation