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Träfflista för sökning "WFRF:(Zong J) srt2:(2001-2004)"

Sökning: WFRF:(Zong J) > (2001-2004)

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1.
  • Adler, SS, et al. (författare)
  • Double helicity asymmetry in inclusive midrapidity pi(0) production for polarized p+p collisions at root s=200 GeV
  • 2004
  • Ingår i: Physical Review Letters. - 1079-7114. ; 93:20: 202002
  • Tidskriftsartikel (refereegranskat)abstract
    • We present a measurement of the double longitudinal spin asymmetry in inclusive pi(0) production in polarized proton-proton collisions at roots=200 GeV. The data were taken at the Relativistic Heavy Ion Collider with average beam polarizations of 0.27. The measurements are the first in a program to study the longitudinal spin structure of the proton, using strongly interacting probes, at collider energies. The asymmetry is presented for transverse momenta 1-5 GeV/c at midrapidity, where next-to-leading-order perturbative quantum chromodynamic (NLO pQCD) calculations well describe the unpolarized cross section. The observed asymmetry is small and is compared to a NLO pQCD calculation with a range of polarized gluon distributions.
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2.
  • Zhang, Zong Xian, et al. (författare)
  • On study of influences of loading rate on fractal dimensions of fracture surfaces in Gabbro
  • 2001
  • Ingår i: Rock Mechanics and Rock Engineering. - : Springer Science and Business Media LLC. - 0723-2632 .- 1434-453X. ; 34:3, s. 235-242
  • Tidskriftsartikel (refereegranskat)abstract
    • Studies of the effects of loading rates on rock fracture were performed for decades. However, the previous work on static or dynamic rock fracture was mainly limited to a macro-experimental study. The present investigation measures the fractal dimensions of the fracture surfaces of the gabbro specimens fractured at various loading rates covering static and dynamic loading, and explores the relationship between the fractal dimensions and the fracture toughness of the rock.
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