686 research outputs found
In-situ corrosion studies on selected high-level waste packaging materials under simulated disposal conditions in rock salt formations
Gamma irradiation and in-situ corrosion studies on unalloyed steels for a high level waste packaging in a rock salt repository
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Heteroepitaxial growth of T-Nb2O5 on SrTiO3
There is a growing interest in exploiting the functional properties of niobium oxides in general and of the T-Nb2O5 polymorph in particular. Fundamental investigations of the properties of niobium oxides are, however, hindered by the availability of materials with sufficient structural perfection. It is expected that high-quality T-Nb2O5 can be made using heteroepitaxial growth. Here, we investigated the epitaxial growth of T-Nb2O5 on a prototype perovskite oxide, SrTiO3. Even though there exists a reasonable lattice mismatch in one crystallographic direction, these materials have a significant difference in crystal structure: SrTiO3 is cubic, whereas T-Nb2O5 is orthorhombic. It is found that this difference in symmetry results in the formation of domains that have the T-Nb2O5 c-axis aligned with the SrTiO3 s in-plane directions. Hence, the number of domain orientations is four and two for the growth on (100)s- and (110)s-oriented substrates, respectively. Interestingly, the out-of-plane growth direction remains the same for both substrate orientations, suggesting a weak interfacial coupling between the two materials. Despite challenges associated with the heteroepitaxial growth of T-Nb2O5, the T-Nb2O5 films presented in this paper are a significant improvement in terms of structural quality compared to their polycrystalline counterparts
Corrosion testing of selected packaging materials for disposal of high-level waste glass in rock and salt formations
Statistics of galaxy warps in the HDF North and South
We present a statistical study of the presence of galaxy warps in the Hubble
deep fields. Among a complete sample of 45 edge-on galaxies above a diameter of
1.''3, we find 5 galaxies to be certainly warped and 6 galaxies as good
candidates. In addition, 4 galaxies reveal a characteristic U-warp. Compared to
statistical studies of local warps, and taking into account the strong bias
against observing the outer parts of galaxies at high redshift, these numbers
point towards a very high frequency of warps at z \sim 1: almost all galaxy
discs might be warped. Furthermore, the amplitude of warps are stronger than
for local warps. This is easily interpreted in terms of higher galaxy
interactions and matter accretion in the past. This result supports these two
mechanisms as the best candidates for the origin of early warps. The mean
observed axis ratio of our sample of edge-on galaxies is significantly larger
in the high-z sample than is found for samples of local spiral galaxies. This
might be due to disk thickening due to more frequent galaxy interactions.Comment: 9 pages, 7 figures, accepted in A and
PMH22 RESULTS OF THE GERMAN IDA STUDY—ASSESSING THE FINANCIAL IMPACT OF INFORMAL CARE AMONGST COMMUNITY LIVING DEMENTIA PATIENTS
Corrosion behaviour of selected high-level waste packaging materials under gamma irradiation and in-situ disposal conditions in rock salt
Corrosion behaviour of container materials for the disposal of high-level waste forms in rock salt formations
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