| 321. |
- Musa, L., et al.
(författare)
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Commissioning of the ALICE TPC.
- 2007
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - 0954-3899. ; 34, s. 705-705
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Tidskriftsartikel (refereegranskat)
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| 322. |
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| 323. |
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| 324. |
- Nakamiya, Y., et al.
(författare)
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Systematic measurements of light vector mesons at RHIC-PHENIX
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35
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Tidskriftsartikel (refereegranskat)abstract
- The PHENIX experiment at RHIC has measured and ω meson production in p+p, d+Au and Au+Au collisions for GeV at mid-rapidity. Systematic measurements of light vector mesons for several decay channels provide information about properties of the strongly interacting matter produced in relativistic heavy-ion collisions. We present transverse momentum spectra and nuclear modification factors for and ω mesons. Transverse momentum spectra are compared among different decay channels to discuss yield modification which results from mass modification in the hot medium. We compare the nuclear modification factors of various mesons and discuss differences of their suppression patterns.
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| 325. |
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| 326. |
- Nayak, T., et al.
(författare)
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Proton-proton physics in ALICE.
- 2007
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - 0954-3899. ; 34, s. 783-783
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Tidskriftsartikel (refereegranskat)
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| 327. |
- Nguyen, M., et al.
(författare)
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High-pt direct photon-hadron correlations using the PHENIX detector
- 2008
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Ingår i: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 35:10
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Tidskriftsartikel (refereegranskat)abstract
- Direct photons are a powerful probe to study the property of quark–gluon plasma (QGP) in high energy heavy-ion collisions. In non-central collisions, the anisotropy of the collision region produces the different pressure gradients and particle density that results in different anisotropy of particle emission, depending on the production processes of photons. Therefore, an azimuthal anisotropy parameter v2 is a powerful tool to explore the source of direct photons. We report on the latest direct photon analysis of the nuclear modification factor in and 62.4 GeV Au + Au collisions, and v2 at high pT in 200 GeV Au + Au collisions at RHIC-PHENIX (Run4). We also present the analysis status, using a larger statistics and better reaction plane information from a new detector available from RHIC Run7 data.
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| 328. |
- Nikolaev, S, et al.
(författare)
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Photon flow in 158 A GeV Pb+Pb collisions
- 2003
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Ingår i: Nuclear Physics, Section A. - 0375-9474. ; 715, s. 579-582
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Tidskriftsartikel (refereegranskat)abstract
- Directed and elliptic flow of pi(0) - decay photons in 158 A GeV Pb+Pb collisions has been studied near midrapidity in an analysis of data obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. Preliminary results on the rapidity and transverse momentum dependence of the flow have been obtained for various centrality classes for p(T) > 0.2 GeV/c and 2.3 < y < 2.9. The results are compared with the pion flow.
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| 329. |
- Nishida, Masahiro, et al.
(författare)
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Compressive Properties of High Velocity Pressed Iron Powder at High Strain Rates
- 2013
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Konferensbidrag (refereegranskat)abstract
- In the field of powder metallurgy, high velocity compaction (HVC) is a production technique with capacity to improve the mechanical properties of powder metallurgy parts because high density of powder metallurgy parts can be achieved in less than 0.5 s [1, 2]. In order to extend the usage of the HVC method, detailed knowledge of the HVC process is important. To facilitate development of production processes, numerical simulations can be utilized. A common numerical method for powder compaction is the finite element method (FEM). To conduct on FEM simulation precisely, constitutive data of HVC specimens at high strain-rate are required [3, 4]. In this study, the dynamic compressive properties of cylindrical specimens made by HVC were measured using a Spit Hopkinson Pressure Bar (Kolsky bar). The powder material used for the experiments was a press-ready premix containing Distaloy AE, 0.5% graphite (uf-4) and 0.6% Kenolube. During dynamic compression, the failure behavior of specimens was also observed using a high speed video camera. The experimental results, such as failure stress, Young’s modulus and failure behavior, of dynamic compressive tests were compared with those of static compressive tests. Among specimens made by HVC and Conventional Compaction (CC), the effects of specimen density, 6.9, 7.2 and 7.4 g/cm3, on the compressive properties and failure behavior were also examined. For each density, the difference in the failure behavior between HVC-pressed specimens and conventional pressed specimens was observed, whereas stress-strain curves of HVC-pressed specimens were the same as conventional pressed specimens. Moreover, the effects of specimen size on failure behavior and stress-strain curves of specimens were examined.
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| 330. |
- Nishida, Masahiro, et al.
(författare)
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Determination of dynamic material properties for poly(L-lactic acid)/poly(e-caprolactone) blends : Experiments and simulation using split Hopkinson pressure bars
- 2012
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Ingår i: EPJ Web of Conferences. - Les Ulis : EDP Sciences. - 2100-014X. - 9782759807574 ; , s. 3001-
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Konferensbidrag (refereegranskat)abstract
- Coefficients of Cowper-Symonds constitutive equation for PLLA/PCL = 80/20 were determined using the results of compressive tests at high and low strain rates. The simulation of split Hopkinson pressure bar using the coefficients was carried out under the same condition as the experiments. The diameter and thickness of specimens were measured by a high-speed video camera. The stress and strain histories of specimens, the thickness and the diameter in the simulations at high strain rate were compared with those in the experiments
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