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11.
R. J. Fries 《Pramana》2010,75(2):235-245
We review some basic concepts of relativistic heavy-ion physics and discuss our understanding of some key results from the
experimental program at the relativistic heavy-ion collider (RHIC). We focus in particular on the early time dynamics of nuclear
collisions, some result from lattice QCD, hard probes and photons. 相似文献
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W. Fries W. Schwarz H.-D. Hausen J. Weidlein 《Journal of organometallic chemistry》1978,159(4):373-384
Dimethylpropynylmetal compounds of Al, Ga and In are formed in 40–60% yield by the reaction of NaCCCH3 with (CH3)2MIIIHal (MIII Al, Ga, In; Hal Cl, Br). The IR, Raman, 1H and 13C NMR spectra of these, in solution dimeric, compounds are discussed. The indium derivative crystallizes in the orthorhombic space group Pnma with 4 formula units per unit cell. The lattice parameters are a 926.9; b 578.7 and c 1216.6 pm. 相似文献
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We discuss different sources of hadron correlations in relativistic heavy ion collisions. We show that correlations among partons in a quasithermal medium can lead to the correlated emission of hadrons by quark recombination and argue that this mechanism offers a plausible explanation for the dihadron correlations in the few GeV/c momentum range observed in Au+Au collisions at the BNL Relativistic Heavy Ion Collider. 相似文献
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Donata M. Fries Franz Trachsel Philipp Rudolf von Rohr 《International Journal of Multiphase Flow》2008
We used optical methods such as Laser Induced Fluorescence (LIF) and confocal Laser Scanning Microscopy (LSM) to characterize gas–liquid phase distribution in rectangular microchannels. Using a 2 m long microchannel with a hydraulic diameter of 200 μm enables the precise measurement of important parameters such as liquid slug length, bubble length, pressure drop and film thickness at the wall as well as in the corner of the microchannel for low Capillary numbers (Ca) ranging from 2 × 10−4 to 1 × 10−2. This range of Ca was obtained by using different fluid pairs such as ethanol, water and different concentrated aqueous solutions of glycerol in combination with nitrogen. 相似文献
18.
T. P. Fries 《国际流体数值方法杂志》2009,60(4):437-471
In two‐fluid flows, jumps and/or kinks along the interfaces are present in the resulting velocity and pressure fields. Standard methods require mesh manipulations with the aim that either element edges align with the interfaces or that the mesh is sufficiently refined near the interfaces. In contrast, enriched methods, such as the extended finite element method (XFEM), enable the representation of arbitrary jumps and kinks inside elements. Thereby, optimal convergence can be achieved for two‐fluid flows with meshes that remain fixed throughout the simulation. In the intrinsic XFEM, in contrast to other enriched methods, no more unknowns are present in the approximation than in a standard finite element approximation. In this work, the intrinsic XFEM is employed for the simulation of incompressible two‐fluid flows. Numerical results are shown for a number of test cases and prove the success of the method. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
19.
In immiscible two-phase flows, jumps or kinks are present in the velocity and pressure fields across the interfaces of the two fluids. The extended finite element method (XFEM) is able to reproduce such discontinuities within elements. Robust and accurate interface capturing schemes with no restrictions on the interface topology are thereby enabled. This paper investigates different enrichment schemes and time-integration schemes within the XFEM. Test cases with and without surface tension on moving or stationary meshes are studied and compared to interface tracking results when possible. A particularly useful setting is extracted which is recommended for two-phase flows. An extension of this formulation for the simulation of free-surface flows and of floating objects is proposed. 相似文献
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