We report on the measurements of directed flow and elliptic flow $ν_{2}$ for hadrons ($π^{±}$, $Κ^{±}$, $Κ^{0}_{s}$, p, φ, Λ and $Ξ^{-}$) from Au+Au collisions at $ \sqrt{s_{NN}}$ = 3 GeV and for ...($π^{±}$, $Κ^{±}$, $p$ and $\bar{p}$) at 27 and 54.4 GeV with the STAR experiment. While at the two higher energy midcentral collisions the number-of-constituent-quark (NCQ) scaling holds, at 3 GeV the at midrapidity is negative for all hadrons and the NCQ scaling is absent. In addition, the slopes at midrapidity for almost all observed hadrons are found to be positive, implying dominant repulsive baryonic interactions. The features of negative $ν_{2}$ and positive $ν_{1}$ slope at 3 GeV can be reproduced with a baryonic mean-field in transport model calculations. These results imply that the medium in such collisions is likely characterized by baryonic interactions.
In high-energy heavy-ion collisions, partonic collectivity is evidenced by the constituent quark number scaling of elliptic flow anisotropy for identified hadrons. A breaking of this scaling and ...dominance of baryonic interactions is found for identified hadron collective flow measurements in $\sqrt{^{S}\text{NN}}$ = 3 GeV Au+Au collisions. In this paper, we report measurements of the first- and second-order azimuthal anisotropic parameters, v1 and v2, of light nuclei (d, t, 3He, 4He) produced in $\sqrt{^{S}\text{NN}}$ = 3 GeV Au+Au collisions at the STAR experiment. An atomic mass number scaling is found in the measured v1 slopes of light nuclei at mid-rapidity. For the measured v2 magnitude, a strong rapidity dependence is observed. Unlike v2 at higher collision energies, the v2 values at mid-rapidity for all light nuclei are negative and no scaling is observed with the atomic mass number. Calculations by the Jet AA Microscopic Transport Model (JAM), with baryonic mean-field plus nucleon coalescence, are in good agreement with our observations, implying baryonic interactions dominate the collective dynamics in 3 GeV Au+Au collisions at RHIC.
In recent decades, inorganic crystals have been widely used in dark matter direct search experiments. To contribute to the understanding of the capabilities of CsI(Na) and CaF2(Eu) crystals, a ...mono-energetic neutron beam is utilized to study the properties of nuclear recoils, which are expected to be similar to signals of dark matter direct detection. The quenching factor of nuclear recoils in CsI(Na) and CaF2Eu, as well as an improved discrimination factor between nuclear recoils and γ backgrounds in CsI(Na), are reported.
To explore characteristic and function of peripheral blood mononuclear cells (PBMNC) -induced macrophages in patients with myelodysplastic syndrome (MDS) to couple with its progression.
A total of 24 ...MDS patients (11 low-risk patients and 13 high-risk group patients) referred to Department of Hematology of Tianjin Medical University General Hospital and normal controls were enrolled from September 2014 to December 2015. PBMNC was stimulated with GM-CSF to transform to macrophages. The morphology of macrophages was observed by microscope. The quantity of macrophages, CD206 and SIRPα on surface of macrophages were detected by flow cytometry. The phagocytic function of macrophages was analyzed by fluorescence microscopy and flow cytometry.
The morphology of macrophages from MDS patients was abnormal. The percentage of transformed macrophages was (5.17±3.47) % in patients with MDS, which was lower than that in controls significantly (66.18±13.43) %,
=3.529,
=0.001. The expression of CD206 on macrophages from MD
Alpha-alumina platelets have attracted much attention in recent years, due to their high fracture toughness, high elastic modulus, high strength and good corrosion resistance. In this paper, alpha ...-Al sub(2)O sub(3) platelets were successfully synthesised by flux method using gamma -AlOOH powder as starting material, KCl-K sub(2)SO sub(4)-Na sub(2)SO sub(4) composite salts as flux respectively. Differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis showed that the flux has a low melting point of about 560 plus or minus 1 degree C and well stability even under temperature of 900 degree C, which is beneficial for the steady reaction and crystal growth under low temperature. Highly dispersed and hexagonal single crystal alpha -Al sub(2)O sub(3) platelets can be well formed at temperature of 900 degree C, and the average size of the platelets is about 6-7 mu m.
Ultrathick continuous slab casting is a growing technology, especially in developing countries due to the vast market demand of thick rolled plate. The structure of the submerged entry nozzle is ...regarded as the crucial factor to determine flow related phenomena in the mould. This article conducts a 0·55 scale water model and a three-dimensional numerical model to investigate the influences of submerged entry nozzle on flow behaviour, temperature field and solidified shell distribution in a 420 mm ultrathick slab mould. Physical and numerical finite volume methods with K-ϵ turbulence model simulations verify that the flow pattern in ultrathick mould is similar with that in conventional slab mould. The diffuse type nozzle fails to increase the surface velocity while easily causing slag entrainment. The four-spout nozzle gives a detrimental effect on shell distribution. The tunnel bottom nozzle is optimal, because it shows a lively surface behaviour and a favourable heat transfer between mould flux and surface flow, and the shell thickness is uniform and thick enough at the mould exit to avoid breakout.
Numerical simulation is carried out for gas-solid two-phase flow in a U-beam separator. In this study, the U-beam is altered with the inlet fins in order to improve the performance of the separator. ...The inlet fin angle of the separator are 30°, 35°, 40°, 45°, 50°, 55 ° and 60°. The governing equations are the Reynolds-Averaged Navier-Stokes equation with the standard k-ε model and the discrete phase model (DPM) describing the discrete two - phase flow as well as stochastic tracking model. Results show that the pressure drop deviation with fins is within 3% from those without fins. It is found that there is a maximum separation efficiency at the fin angle of 35°. Fin induces generation of a stagnation region which could collect particles and lead to change of vortical structures. The fin induced flow also causes the turbulent intensity inside the baffle to decrease to facilitate separation.
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