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Sökning: WFRF:(Tang Wei) > (2005-2009)

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1.
  • Zhang, Wei-Wei, et al. (författare)
  • Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations
  • 2009
  • Ingår i: Journal of Phase Equilibria and Diffusion. - 1547-7037. ; 30:5, s. 480-486
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The Cu-B system was investigated via a hybrid approach of key experiment and thermodynamic modeling. Based on the critically assessed Cu-B phase diagram, seven crucial alloys were selected and prepared by arc melting the pure elements. An inductively coupled plasma-atomic emission spectrometric analysis was conducted to determine the compositions of the prepared alloys. The phase equilibria were determined by using x-ray diffraction, electron probe microanalysis, and differential thermal analysis. The temperature associated with the eutectic reaction, L double left right arrow (B) + (Cu); was measured to be 1028 +/- 2 degrees C. First-principles calculations indicate that the energy of inserting a B atom into the interstitial vacancy (Va) site of the lattice for Cu atoms is marginally lower than that of substituting for a Cu atom with a B atom. Consequently, the sublattice model (Cu)(B, Va) in which B atoms occupy the interstitial sites was employed for the fcc (Cu) phase rather than the model (Cu, B)(Va) in which B atoms substitute for Cu atoms. A thermodynamic modeling of the Cu-B system was then performed by considering the reliable literature data and the present experimental results. A good agreement between modeling and experiment was obtained.</p>
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2.
  • Ablikim, M., et al. (författare)
  • Measurements of (XcJ)-&gt; K+K-K+K- decays
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 642:3, s. 197-202
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 14M psi(2S) events taken with the BESII detector, chi(cJ) -&gt; 2(K+K-) decays are studied. For the four-kaon final state, the branching fractions are B(chi(c0,1,2) -&gt;.2(K+K-)) = (3.48 +/- 0.23 +/- 0.47) x 10(-3), (0.70 +/- 0.13 +/- 0.10) x 10(-3), and (2.17 +/- 0.20 +/- 0.31) x 10(-3). For the phi K+K- final state, the branching fractions, which are measured for the first time, are B(chi(c0,1,2) -&gt; phi K+K-) = (1.03 +/- 0.22 +/- 0.15) x 10(-3), (0.46 +/- 0.16 +/- 0.06) x 10(-3), and (1.67 +/- 0.26 +/- 0.24) x 10(-4). For the phi phi final state, B(chi(c0,2) -&gt; phi phi) = (0.94 +/- 0.21 +/- 0.13) x 10(-3) and (1.70 +/- 0.30 +/- 0.25) x 10(-3).</p>
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3.
  • Arsenlis, Athanasios, et al. (författare)
  • Enabling strain hardening simulations with dislocation dynamics
  • 2007
  • Ingår i: Modelling and Simulation in Materials Science and Engineering. - 0965-0393 .- 1361-651X. ; 15, s. 553-595
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Numerical algorithms for discrete dislocation dynamics simulations areinvestigated for the purpose of enabling strain hardening simulations of singlecrystals on massively parallel computers. The algorithms investigated includethe O(N) calculation of forces, the equations of motion, time integration,adaptive mesh refinement, the treatment of dislocation core reactions and thedynamic distribution of data and work on parallel computers. A simulationintegrating all these algorithmic elements using the Parallel DislocationSimulator (ParaDiS) code is performed to understand their behaviour in concertand to evaluate the overall numerical performance of dislocation dynamicssimulations and their ability to accumulate percent of plastic strain.</p>
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