Atomic scale characterization of the nucleation and growth of SnO2 particles in oxidized CuSn alloys

The internal oxidation of Sn was investigated to understand the oxidation kinetics of monophase CuSn alloys. SnO2 particles were characterized by analytical transmission electron microscopy. The orientation relationship between SnO2 and Cu was determined with a special emphasis on the atomic scale structure of Cu/SnO2 interfaces (misfit dislocations and chemical structure). Habit planes with a pure oxygen plane terminating the SnO2 phase are greatly favored and large misfits promote the growth of plate shaped precipitates

Escalié, G. et Magendie, É. (dir.). (2019). Alternance intégrative et formation des enseignants

Modalité de formation professionnelle plébiscitée, l’alternance intégrative est définie comme une manière de faciliter les échanges entre théorie et pratique. Au-delà d’une première définition de principe, l’ouvrage dirigé par Guillaume Escalié et Élisabeth Magendie se propose d’analyser les enjeux, les défis et les perspectives qui peuvent être dégagés lorsqu’on observe la mise en œuvre de cette alternance dans le contexte de la formation des enseignants. Comme le souligne Carole Sève en pré..

Hommage à Jean-Pierre Thieck

Hommages rendus au chercheur et journaliste ami de Michel Seurat

Hommage à Jean-Pierre Thieck

Hommages rendus au chercheur et journaliste ami de Michel Seurat

Model Driven Engineering and Dependability Analyses: The Topcased Approach

International audienceModel Driven Engineering approaches are widely promoted to overcome difficulties to design, validate and maintain large complex systems. They present interesting dependability characteristics especially in terms of prevention of design faults and validation of design correctness. However industrial needs, practices and applicable standards impose constraints on the dependability activities to perform and justify. Therefore it is necessary to analyze how a complete dependability and safety process can be integrated with model-driven approaches within a seamless global process: which dependability activities are naturally covered or facilitated by model-driven approaches, and which additional activities are needed with which support. This paper presents the results of a study aiming at the establishment of requirements to model-driven engineering methods and tools, to support dependability analyses

Metallic and nonmetallic double perovskites: A case study of A2_2FeReO6_6 (A= Ca, Sr, Ba)

We have investigated the structure and electronic properties of ferrimagnetic double perovskites, A2FeReO6 (A= Ca, Sr, Ba). The A=Ba phase is cubic (Fm3m) and metallic, while the A=Ca phase is monoclinic (P21/n) and nonmetallic. 57Fe Mossbauer spectroscopy shows that iron is present mainly in the high-spin (S=5/2) Fe3+ state in the Ca compound, while it occurs in an intermediate state between high-spin Fe2+ and Fe3+ in the Ba compound. It is argued that a direct Re t2g - Re t2g interaction is the main cause for the metallic character of the Ba compound; the high covalency of Ca-O bonds and the monoclinic distortion (which lifts the degeneracy of t2g states) seem to disrupt the Re-Re interaction in the case of the Ca compound, making it non-metallic for the same electron count.Comment: 1 eps fil

Professeurs des écoles débutants : enseignants et/ou médiateurs

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Analyse d’un dispositif de formation de circonscription en maillage

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Avant-propos

La présence livraison des Cahiers du Cermoc témoigne de leur vocation première: accueillir et promouvoir les travaux de jeunes chercheurs en sciences sociales confrontés à la recherche de terrain au Proche-Orient. Le travail de Joseph Bahout a été conçu et réalisé dans le cadre d’un Diplôme d’Études Approfondies sous la direction de Rémy Leveau à l’Institut d’Études Politiques de Paris en 1992. Publié en 1994, il ne perd rien de son actualité et de son intérêt. Le fait qu’un Libanais en soit ..