The Static and Dynamic Lattice Changes Induced by Hydrogen Adsorption on NiAl(110)

Static and dynamic changes induced by adsorption of atomic hydrogen on the NiAl(110) lattice at 130 K have been examined as a function of adsorbate coverage. Adsorbed hydrogen exists in three distinct phases. At low coverages the hydrogen is itinerant because of quantum tunneling between sites and exhibits no observable vibrational modes. Between 0.4 ML and 0.6 ML, substrate mediated interactions produce an ordered superstructure with c(2x2) symmetry, and at higher coverages, hydrogen exists as a disordered lattice gas. This picture of how hydrogen interacts with NiAl(110) is developed from our data and compared to current theoretical predictions.Comment: 36 pages, including 12 figures, 2 tables and 58 reference

Multi-tiling and Riesz bases CRM Preprint Series number 1135 MULTI-TILING AND RIESZ BASES

Abstract. Let S be a bounded, Riemann measurable set in R d , and Λ be a lattice. By a theorem of Fuglede, if S tiles R d with translation set Λ, then S has an orthogonal basis of exponentials. We show that, under the more general condition that S multi-tiles R d with translation set Λ, S has a Riesz basis of exponentials. The proof is based on Meyer's quasicrystals

Nuclear waste related satellite mapping in northwest Russia

In the early phase of a project organized by the Norwegian Radiation Protection Authority (NRPA) dealing with monitoring of radioactive radiation from nuclear waste deposited at the former naval station Andreeva Bay in northwest Russia, a suitable base map at a scale sufficiently large to be used as a georeferencing tool for radiation measurements and also as a background map for presentations, was not available. It was therefore decided to use high resolution satellite imagery for this purpose, and a collaboration with the Geomatics section - IMT at the Norwegian University of Life Sciences (UMB), was established.A Landsat-7 ETM+ precision corrected scene from the USGS 15 meter resolution data collection was used as a basis for a georeference adjustment of a system corrected QuickBird sub-scene. By establishing an adequate transformations based on Ground Control Points (GCPs), between the adjusted QuickBird sub-scene and a local grid, it was possible to locate the original radioactive radiation measurements with acceptable precision within the UTM Sone 36 N WGS84 geographical reference frame.At a later stage of the project, after the Satellite Image Map preparation, a digital version in raster format of a Russian topographic map sheet at scale 1:50 000 became available. This dataset offered a possibility for the assessment of the combined Landsat-7 ETM+/QuickBird rectification, and in addition an opportunity for an assessment of the influence of the terrain elevation on the geometry of the rectified satellite image

Nuclear waste related satellite mapping in northwest Russia

In the early phase of a project organized by the Norwegian Radiation Protection Authority (NRPA) dealing with monitoring of radioactive radiation from nuclear waste deposited at the former naval station Andreeva Bay in northwest Russia, a suitable base map at a scale sufficiently large to be used as a georeferencing tool for radiation measurements and also as a background map for presentations, was not available. It was therefore decided to use high resolution satellite imagery for this purpose, and a collaboration with the Geomatics section - IMT at the Norwegian University of Life Sciences (UMB), was established.A Landsat-7 ETM+ precision corrected scene from the USGS 15 meter resolution data collection was used as a basis for a georeference adjustment of a system corrected QuickBird sub-scene. By establishing an adequate transformations based on Ground Control Points (GCPs), between the adjusted QuickBird sub-scene and a local grid, it was possible to locate the original radioactive radiation measurements with acceptable precision within the UTM Sone 36 N WGS84 geographical reference frame.At a later stage of the project, after the Satellite Image Map preparation, a digital version in raster format of a Russian topographic map sheet at scale 1:50 000 became available. This dataset offered a possibility for the assessment of the combined Landsat-7 ETM+/QuickBird rectification, and in addition an opportunity for an assessment of the influence of the terrain elevation on the geometry of the rectified satellite image