3 research outputs found
Inclusive particle production in 400 GeV/c pp-interactions
We report on a study of inclusive particle production in pp-interactions at 400 GeV/c. The data are based on 472 K reconstructed events recorded in the NA 27 experiment using the LEBC-EHS facility at CERN. The production cross sections are determined of pseudo scalar (π± ,0,η and K±), scalar (f 0(975)), vector (ρ± ,0(770),ω (783), Φ (1020),K∗ 0(892), and K∗ 0 (892)), and tensor f0 mesons, of protons and antiprotons, and the Δ++,+,0(1232), and Λ(1520) baryon resonances in the forward hemisphere of the center of mass system, as well as longitudinal and transverse momentum distributions. The results are compared with predictions of the FRITIOF model and with other experimental data
Quantifying dispersion of layered nanocomposites via melt rheology
Rheological measurements are used to compare clay nanocomposites prepared through melt mixing using two different polypropylene matrices. Steady state and transient nonlinear theological experiments are employed to separate the contributions of flow induced orientation of the tactoids and particulate network build-up. The conditions under which the theological properties are dominated by the aggregate network are subsequently identified. Under these conditions, the low frequency linear viscoelastic behavior is analyzed using scaling concepts for fractal networks to determine the degree of network formation by exfoliation. Moreover, the high frequency behavior of the moduli can be used to quickly assess the dispersion quality. The results from the analysis of the linear viscoelastic data are compared to structural features extracted from electron microscopy and small angle X-ray scattering data. (c) 2007 The Society of Rheology.status: publishe