Iron deposition on the tenfold surface of the Al72Ni 11Co17 decagonal quasicrystal

The adsorption behaviour of Fe on the tenfold surface of the decagonal quasicrystal Al72.6Ni10.5Co16.9 has been studied using scanning tunnelling microscopy, low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and x-ray magnetic circular dichroism (XMCD). The results show the growth of a disordered film up to a coverage of 9MLE (monolayer equivalent) after which polycrystalline island growth is observed. These islands are interconnected, and the LEED pattern indicates that they preferentially align along five directions. The AES results indicate that the film is composed of Fe intermixed with the substrate elements. The XMCD results point to an induced magnetic moment for Co and Ni in the intermixed layer/interface region

A Comparison of Equality in Computer Algebra and Correctness in Mathematical Pedagogy

◮ A relatively traditional mathematics course, at, say first-year undergraduate level. Setting ◮ A relatively traditional mathematics course, at, say first-year undergraduate level. ◮ But Computer-Aided Assessment is in use. Setting ◮ A relatively traditional mathematics course, at, say first-year undergraduate level. ◮ But Computer-Aided Assessment is in use. ◮ One such example is WeBWorK, another is MapleTA. Setting ◮ A relatively traditional mathematics course, at, say first-year undergraduate level. ◮ But Computer-Aided Assessment is in use. ◮ One such example is WeBWorK, another is MapleTA. ◮ “Harness the power of technology to improve teaching and learning ” [AMS Notices, June 2009]. [1] Web-based Assessment and Testing System