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Sökning: WFRF:(Guttmann C)

  • Resultat 1-7 av 7
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  • Gleber, S. -C, et al. (författare)
  • X-ray stereo microscopy for investigation of dynamics in soils
  • 2009
  • Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 186, s. 012104-
  • Tidskriftsartikel (refereegranskat)abstract
    • The here presented combination of stereo imaging and elemental mapping with soft X-ray microscopy reveals the spatial arrangement of naturally aqueous colloidal systems, e.g. iron oxides in soil colloid clusters. Changes in the spatial arrangement can be induced by manipulating the sample in-situ and thus be investigated directly and as a function of time.
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  • Legall, H., et al. (författare)
  • Compact X-ray microscope for the water window based on a high brightness laser plasma source
  • 2012
  • Ingår i: Optics Express. - 1094-4087. ; 20:16, s. 18362-18369
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a laser plasma based x-ray microscope for the water window employing a high-average power laser system for plasma generation. At 90 W laser power a brightness of 7.4 x 10(11) photons/(s x sr x mu m(2)) was measured for the nitrogen Ly alpha line emission at 2.478 nm. Using a multilayer condenser mirror with 0.3 % reflectivity 10(6) photons/(mu m(2) x s) were obtained in the object plane. Microscopy performed at a laser power of 60 W resolves 40 nm lines with an exposure time of 60 s. The exposure time can be further reduced to 20 s by the use of new multilayer condenser optics and operating the laser at its full power of 130 W.
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  • Schumann, S, et al. (författare)
  • Cardiogenic oscillations in spontaneous breathing airway signal reflect respiratory system mechanics
  • 2011
  • Ingår i: Acta Anaesthesiologica Scandinavica. - : Wiley. - 0001-5172 .- 1399-6576. ; 55:8, s. 980-986
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Heartbeat-related pressure oscillations appear at the airway opening. We investigated whether these cardiogenic oscillations (COS) - extracted from spontaneous breathing signals - reflect the compliance of the respiratory system. Methods: Fifteen volunteers breathed spontaneously at normal or reduced chest wall compliance, i.e. with and without thorax strapping, and at normal or reduced lung compliance, induced by positive end-expiratory pressure (PEEP). COS-related signals were extracted by averaging the flow and pressure curve sections, temporally aligned to the electrocardiogram signal. Results: COS-related airway pressure and flow curves correlated closely for each subject (r(2) =0.97±0.02, P<0.0001). At the unstrapped thorax, the oscillation's amplitudes were 0.07±0.03 cmH(2) O (pressure) and 22±10 ml/s (flow). COS-related pressure amplitudes correlated closely with the ratio of tidal volume divided by pressure amplitude (r(2) =0.88, P<0.001) and furthermore increased with either thorax strapping (P<0.001) or with increasing PEEP (P=0.049). Conclusion: We conclude that COS extracted from the pressure and flow signal reflect the compliance of the respiratory system and could potentially allow estimating respiratory system mechanics during spontaneous breathing.
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  • Resultat 1-7 av 7

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