Ion mixing to produce amorphous Mo-Ru superconducting films

Amorphous Mo55Ru45 alloy films were formed by ion mixing of multilayered samples. The ion mixed films, which contain no metalloid element, show excellent superconducting properties. The measured properties are correlated with the microstructure obtained by both x-ray diffraction and transmission electron microscopy

Howe duality and algebras of the Askey-Wilson type: an overview

The Askey-Wilson algebra and its relatives such as the Racah and Bannai-Ito algebras were initially introduced in connection with the eponym orthogonal polynomials. They have since proved ubiquitous. In particular they admit presentations as commutants that are related through Howe duality. This paper surveys these results.Comment: 8 pages, Proceedings for XI. International Symposium Quantum Theory and Symmetries, 1 - 5 July 2019, Montreal, Canad

The rational Sklyanin algebra and the Wilson and para-Racah polynomials

The relation between Wilson and para-Racah polynomials and representations of the degenerate rational Sklyanin algebra is established. Second order Heun operators on quadratic grids with no diagonal terms are determined. These special or S-Heun operators lead to the rational degeneration of the Sklyanin algebra; they also entail the contiguity and structure operators of the Wilson polynomials. The finite-dimensional restriction yields a representation that acts on the para-Racah polynomials.Comment: 16 page

Jean-Louis Cabanès, La fabrique des valeurs dans la littérature du xixe siècle

Jean-Louis Cabanès livre dans cet ouvrage une série d’études qui interrogent à nouveaux frais les rapports entre savoir et littérature, dont il est spécialiste. Le terme de «valeurs» est ici décliné dans sa dimension axiologique et épistémologique. L’essai commence par une enquête autour du thème du poncif, dans laquelle J.-L. Cabanès entend prouver ce qui fonde la qualité littéraire au sein d’un corpus de romans travaillant tous les thèmes de «la machine», et différencier les «romans nuls» d..