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Sökning: WFRF:(Schreiber S) > Konferensbidrag

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1.
  • Lechner, C., et al. (författare)
  • First direct seeding at 38 nm
  • 2012
  • Ingår i: FEL 2012 - 34th International Free Electron Laser Conference. - 9783954501236 ; , s. 197-199
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The sFLASH project at DESY is an experiment to study direct seeding using a source based on the high-harmonic generation (HHG) process. In contrast to SASE, a seeded FEL exhibits greatly improved longitudinal coherence and higher shot-to-shot stability (both spectral and energetic). In addition, the output of the seeded FEL is intrinsically synchronized to the HHG drive laser, thus enabling pump-probe experiments with a resolution of the order of 10 fs. The installation and successful commissioning of the sFLASH components in 2010/2011 has been followed by a planned upgrade in autumn 2011. As a result of these improvements, in spring 2012 direct HHG seeding at 38 nm has been successfully demonstrated. In this contribution, we describe the experimental layout and announce the first seeding at 38 nm.
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  • Tabar, László K., et al. (författare)
  • Three Digital Mammography Display Configurations : Observer Performance in a Pilot ROC Study
  • 2010
  • Ingår i: Digital Mammography. - Berlin, Germany : Springer-Verlag. - 9783642136658 ; , s. 280-287
  • Konferensbidrag (refereegranskat)abstract
    • The purpose of this study was to determine if displays that provide more grayscale levels (10bit vs. 8bit) can improve observer performance in breast cancer detection. The study was also designed to determine if 3MP (million-pixel) displays can achieve similar observer performance as compared to 5MP displays. The study was performed using the WorkstationOne mammography software on Dome (R) E5 and E3 high-resolution displays. Ten radiologists reviewed 33 digital mammography screening studies. On 5MP displays, the average Az value across all observers was 0.7912 using 8bit displays, and 0.8306 using 10bit displays. The difference between 8bit and 10bit displays is statistically significant (F=4.43, p=0.0157). The difference of the average Az value from 8bit 3MP displays is not statistically significant compared to reading with 5MP displays. The implications of the study are that, using appropriate software and hardware, 5MP 10bit displays may improve diagnostic accuracy and 3MP displays may not impact negatively diagnostic accuracy.
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  • Resultat 1-8 av 8

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