First principle energies of binary and ternary phases of the Fe–Nb–Ni–Cr system

We present first principles enthalpies of formation and lattice parameters of iron, nickel, chromium and niobium alloys. Some of these results have been partially used in a recent assessment of the Fe–Ni–Cr–Nb quaternary phase diagram. Emphasis has been put on the fcc (A1) and bcc (A2) unary structures, the X3Y-D022, -L12, -D03, -D0a, X2Y-C14(MgZn2), -C15(MgCu2) and -C36 (MgNi2) Laves and X7Y6-D85 (μ) binary phases, and the X8Y4Z18-D8b (σ) ternary phase. We employed the state of the art to compute their properties by means of the DFT (PBE functional and PAW pseudo potentials). A comparison with experimental and theoretical data is also provided

Alien Registration- Mathon, Bernadette (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/28948/thumbnail.jp

Alien Registration- Mathon, Ernest (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/28949/thumbnail.jp

Alien Registration- Mathon, Wilfred (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/28951/thumbnail.jp

A (49,16,3,6) strongly regular graph does not exist

Graphs;mathematics

Systematic Two-band Model Calculations of the GMR Effect with Metallic and Nonmetallic Spacers and with Impurities

By an accurate Green's function method we calculate conductances and the corresponding Giant Magneto-Resistance effects (GMR) of two metallic ferromagnetic films separated by different spacers, metallic and non-metallic ones, in a simplified model on a sc lattice, in CPP and CIP geometries (i.e. current perpendicular or parallel to the planes), without impurities, or with interface- or bulk impurities. The electronic structure of the systems is approximated by two hybridized orbitals per atom, to mimic s-bands and d-bands and their hybridization. We show that such calculations usually give rough estimates only, but of the correct order of magnitude; in particular, the predictions on the impurity effects depend strongly on the model parameters. One of our main results is the prediction of huge CPP-GMR effects for {\it non-metallic} spacers in the ballistic limit.Comment: Revised version; discussions and references improved; accepted by JMM

La tribune peinte de l'église Sainte-Eulalie de Millas: étude technique et conservation

La réalisation de la tribune de l'église de Millas est bien documentée entre 1440 et 1442. Sa grande originalité réside dans la présence de 52 têtes sculptées et polychromes et de 13 armoiries différentes répétées à 132 reprises qui correspondent probablement aux personnes ayant participé à son financement. Elle est composée de 26 poutres, 104 corbeaux, 156 closoirs et 104 caissons sculptés. Différentes interventions par le passé ont contribué à endommager la structure, mais surtout la polychromie. Une intervention de restauration est nécessaire afin de reprendre les assemblages, consolider le bois, refixer la polychromie et éliminer les restes de repeints

Alien Registration- Mathon, Marie L. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/28950/thumbnail.jp