Results 211 to 220 of about 42,514 (244)
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Nanocrystalline alloys studied by positron annihilation lifetime spectroscopy
physica status solidi c, 2007AbstractNanocrystalline alloys present a new class of materials that exhibit interesting magnetic properties. These stem primarily from the presence of crystalline grains with the size of several tens of nanometers embedded in a residual amorphous matrix.
Martin Petriska +4 more
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Open volume in bioadhesive detected by positron annihilation lifetime spectroscopy
Acta Biomaterialia, 2010Barnacles attach to a wide variety of surfaces underwater and show substrate-specific adhesion mechanisms. Investigating and understanding these mechanisms is a key for developing new technical adhesives. We expected open volume (porosity) at the sub-nanometre scale to occur in barnacle adhesive.
Klaus, Rätzke +6 more
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Design of a slow pulsed positron beam for positron annihilation lifetime spectroscopy
2007 IEEE Nuclear Science Symposium Conference Record, 2007Positron annihilation spectroscopy provides a useful tool for the non-destructive study of subsurface microscopic defects. Variations in the electronic environment, from that of the bulk of the material, caused by defects introduce Coulombic forces which cause positrons to localize at the site of defects. This lifetime can vary from nanoseconds, if the
Alfred G. Hathaway +3 more
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Positron lifetime spectroscopy of internally oxidised Ag-In alloys
Journal of Physics: Condensed Matter, 1989The effects of In2O3 precipitates on positron lifetimes after internal oxidation of alpha -Ag-In alloys have been investigated. A positron trap associated with the lifetime tau =205(3) ps was detected. On the basis of the experimental results obtained for different oxidation kinetics parameters, a trapping model is proposed according to which positrons
D Wegner, K P Lieb
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Digital positron lifetime spectroscopy: present status and outlook
physica status solidi c, 2007AbstractThis contribution summarizes achievements in instrumentation for positron lifetime measurements with emphasis on digital spectrometric systems. A significant part of the data presented are based on a long‐term exploitation of a conventional positron lifetime spectrometer developed at Charles University in early 90s, on bench‐mark testing ...
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Positron Lifetime Spectroscopy in Polystyrene
Materials Science Forum, 1992J.-E. Kluin, Franz Faupel
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Development of an Electron-Positron Source for Positron Annihilation Lifetime Spectroscopy
2007Abstract : The extremely strong fields produced by focusing powerful laser pulses into minute volumes of material enable relativistic effects to be used to generate radiation, to accelerate particles, and to produce electrons and positrons from vacuum.
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Detection of tribolayer in different metals using positron lifetime spectroscopy
Tribology International, 2019J. Dryzek
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Three Dimensional Scanning Positron Lifetime Spectroscopy
Materials Science Forum, 1994Ryoichi Suzuki +4 more
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Positron Lifetime Spectroscopy to Study Defects in Solids
Solid State PhenomenaPositron lifetime spectroscopy is a powerful non-destructive technique for characterizing open-volume lattice defects in solids at the atomic scale. This technique enables the identification of defects and the determination of defect concentration.
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