297 research outputs found
Structure of the icosahedral Ti-Zr-Ni quasicrystal
Full text linkThe atomic structure of the icosahedral Ti-Zr-Ni quasicrystal is determined
by invoking similarities to periodic crystalline phases, diffraction data and
the results from ab initio calculations. The structure is modeled by
decorations of the canonical cell tiling geometry. The initial decoration model
is based on the structure of the Frank-Kasper phase W-TiZrNi, the 1/1
approximant structure of the quasicrystal. The decoration model is optimized
using a new method of structural analysis combining a least-squares refinement
of diffraction data with results from ab initio calculations. The resulting
structural model of icosahedral Ti-Zr-Ni is interpreted as a simple decoration
rule and structural details are discussed.Comment: 12 pages, 8 figure
Photosynthetic characteristics of a tropical population of Nitella cernua (Characeae, Chlorophyta)
Full text linkSites and Mode of Action of a Native Inhibitor from Pisum sativum Affecting the Biogenesis of Auxin
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Hemmung und Enthemmung von Samenkeimung und Knospenwachstum mit synthetischen und nativen Enzyminhibitoren und deren Antagonisten
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