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Träfflista för sökning "WFRF:(Blohm C.) srt2:(2009)"

Sökning: WFRF:(Blohm C.) > (2009)

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1.
  • Aaron, F. D., et al. (författare)
  • Multi-leptons with high transverse momentum at HERA
  • 2009
  • Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; :10
  • Tidskriftsartikel (refereegranskat)abstract
    • Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb(-1). The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e(+)p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94 +/- 0.17 events are expected. Such events are not observed in e(-)p collisions for which 1.19 +/- 0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.
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2.
  • Johnson, J., et al. (författare)
  • Some properties of flexographic printing plates and aspects of print quality
  • 2009
  • Ingår i: Appita journal. - 1038-6807. ; 62:5, s. 371-378
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this research was to study the effects on print quality when the properties of the flexographic printing plate were changed in a systematic and controlled way. An attempt was made to identify plate parameters that govern good print quality. Coated paperboard was printed in a laboratory printing press using different plates, and print density and dot gain were determined. Essential parameters including mechanical, chemical, and morphological properties of the plate that led to good print quality were identified. The properties of the plates were characterised by means of profilometry, ESCA, contact angle measurements, durometer, and image analysis. The methods used to create printing plates with controlled material properties gave useful information about the ageing and wear of printing plates. The results showed that it was possible to systematically control the properties of the plate by changing the pre-press conditions. Application pressures and dot area influenced print quality. Small-scale roughness and long-scale roughness of the plate governed good print quality with respect to print density and dot gain It appeared that these printing plate properties affect the amount of ink transferred.
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