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Sökning: WFRF:(Schafer T) > Konferensbidrag

  • Resultat 1-10 av 15
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  • L'Huillier, A., et al. (författare)
  • Atomic physics with attosecond pulses
  • 2006
  • Ingår i: International Conference on Ultrafast Phenomena, UP 2006. - 1557528101 - 9781557528100
  • Konferensbidrag (refereegranskat)
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  • Sansone, G., et al. (författare)
  • Attosecond excitation of electron wavepackets
  • 2008
  • Ingår i: Quantum Electronics and Laser Science Conference, QELS 2008. - 9781557528599
  • Konferensbidrag (refereegranskat)abstract
    • We present experiments, supported by time-dependent Schrödinger simulations, on the dynamics of Helium bound states after an attosecond excitation in the presence of a strong infrared laser field.
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  • Yang, Jian, 1960, et al. (författare)
  • A new metal-rod-supported hat antenna for potentially combining with the eleven antenna as a dual-band feed for reflectors
  • 2011
  • Ingår i: Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011. - 9788882020743 ; , s. 763-767
  • Konferensbidrag (refereegranskat)abstract
    • A new hat feed entirely made of metal without using dielectric material has been developed. Compared to the previous hat feeds, it has lower manufacture cost, higher reliability, and wider bandwidth of reflection coefficient. The feed has been optimized using Genetic Algorithm. A prototype has been manufactured, and measured results are presented to verify the numerical simulations. In addition, the new design opens up the possibility to combine the new hat antenna with the Eleven antenna for a dual-band feed.
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  • Drake, Henrik, 1979-, et al. (författare)
  • Incorporation of trace elements into calcite precipitated from deep anoxic groundwater in fractured granitoid rocks
  • 2017
  • Ingår i: Procedia Earth and Planetary Science. 15th Water-Rock Interaction International Symposium (WRI). Evora, Portugal, OCT 16-21, 2016.. - : Elsevier BV. - 1878-5220. ; , s. 841-844
  • Konferensbidrag (refereegranskat)abstract
    • An extensive microanalytical study of calcite precipitated from groundwater flowing into boreholes at >400 m depth in the Aspo Hard Rock Laboratory, Sweden, has been carried out. Hydrochemical variations in packed-off sections, isolating water-conducting fractures intersected by two boreholes, were documented over a period of 17 years. The extraction of the borehole equipment revealed calcite precipitation on the equipment. This mineral material enabled unique assessment of uptake of different trace elements by calcite during precipitation from granitoid fracture groundwater, at anoxic, low-temperature (c.a 14 degrees C), and neutral (pH: 7.4-7.7) conditions, under variable salinity (Cl: 2500-7000 mg/L) prevailing at these depths. Temporal hydrochemical variations could be traced by detailed micro-analytical transects in the calcites and the influence of metal speciation and complexation on partitioning into calcite could be assessed (e.g. explaining unexpectedly low incorporation of REEs). The resulting environment-specific partition coefficients for a large number of metals are relevant in models of radionuclide retention around proposed deep nuclear waste repositories in this kind of environment, particularly because 1) elements such as REEs act as natural analogues to actinides, and 2) existing coefficients established in laboratory or in other natural environments cannot be unreservedly applied to conditions in deep crystalline rocks.
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