作者机构：
[Sa, Ben-Hao] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;China Inst Atom Energy, Beijing 102413, Peoples R China.;CCAST, World Lab, Beijing 100080, Peoples R China.;Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
通讯机构：
[Sa, Ben-Hao] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We investigated the net charge transfer fluctuation at mid-rapidity region in Au + Au collisions at root s(NN) = 200 GeV. A partonic and hadronic cascade model, PACIAE, is applied to follow the particle transport in both the partonic and hadronic phases. We have determined the factor, kappa, which characterizes the net charge transfer fluctuation. Considering the pure hadronic and pure partonic scenarios, we obtain a factor of 3-5 difference in kappa. However, by switching on the hadronization of partonic matter and introducing the secondary hadron-hadron interactions, the factor kappa will increase and finally approach the value of the pure hadronic scenario within an accuracy of 20%. (c) 2006 Elsevier B.V. All rights reserved.
作者机构：
[Hu, Junhong] Dept. of Electronics and Information Engineering, Central China Normal Univ., Wuhan 430079, China;[Zhang, Tianxu; Jiang, Haoyang] Inst. for Pattern Recognition and Artificial Intelligence, Huazhong Univ. of Sci. and Technol., Wuhan 430074, China
通讯机构：
Dept. of Electronics and Information Engineering, Central China Normal Univ., China
摘要：
The flexibility of traditional image processing system is limited because those system are designed for specific applications. In this paper, a new TMS320C64x-based multi-DSP parallel computing architecture is presented. It has many promising characteristics such as powerful computing capability, broad I/O bandwidth, topology flexibility, and expansibility. The parallel system performance is evaluated by practical experiment.
期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2006年32(3):243-250 ISSN：0954-3899
通讯作者：
Sa, BH
作者机构：
China Inst Atom Energy, Beijing 102413, Peoples R China.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China.;[Sa, BH] China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China.
通讯机构：
[Sa, BH] C;China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China.
摘要：
The BRAHMS and PHOBOS collaborations recently revisited the limiting fragmentation shown in the charged particle pseudorapidity density distribution in Au + Au collisions at RHIC energies. The PHOBOS collaboration especially emphasized that the observations of the charged particle universal (pseudo)rapidity scaling (limiting fragmentation) in and Au + Au collisions at relativistic energies may play an important role in the study of reaction dynamics. We use a parton and hadron cascade model, PACIAE, to investigate the charged particle universal (pseudo)rapidity scaling in the above collisions. It is pointed out that, because the universal scaling was observed in the tail region of the (pseudo)rapidity distributions, the discrepancies among distributions may not be properly visible. Therefore, this universal scaling may not have much to do with reaction dynamics, especially quark–gluon plasma. In addition, the charged particle universal scaling observed in the hadronic final state seems to arise from the partonic initial state.
作者机构：
[Hwa, RC] Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.;Univ Oregon, Dept Phys, Eugene, OR 97403 USA.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Hwa, RC] U;Univ Oregon, Inst Theoret Sci, Eugene, OR 97403 USA.
摘要：
We study the production of hadrons in Au+Au collisions in the region 0.6<xF<1.2, which we refer to as the transfragmentation region (TFR), since it corresponds roughly to η′>0, where η′=η−ybeam, depending on the transverse momentum pT. We show how hadrons can be produced in that region when the hadronization process is parton recombination. The inclusive x distributions for proton and pion production are calculated with momentum degradation taken into account. The results show that the proton yield is significantly higher than that of the pions in the TFR. Without particle identification, the existing data cannot be used for comparison with our result on the p/π ratio. Without pT determination, it is not feasible to relate the x distribution to the experimental η′ distribution. Nevertheless, on theoretical grounds we have shown why the production of hadrons in the TFR is not forbidden by momentum conservation.
期刊：
Monthly Notices of the Royal Astronomical Society,2006年371(4):1659-1662 ISSN：0035-8711
通讯作者：
Zheng, Xiaoping
作者机构：
[Yu, Yunwei; Zheng, Xiaoping; Zhou, Xia; Zheng, XP] Huazhong Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.
通讯机构：
[Zheng, Xiaoping] H;Huazhong Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.
关键词：
dense matter;stars: evolution;stars: neutron;pulsars: general
摘要：
Under the combination effect of recommencement heating due to the spin-down of strange stars (SSs) and heat preservation due to the weak conduction heat of the crust, Cooper pair breaking and formation (PBF) in colour superconducting quark matter arises. We investigate the cooling of SSs with a crust in the colour superconductivity phase including both deconfinement heating (DH) and the PBF process. We find that DH can delay the thermal evolution of SSs and the PBF process suppresses the early temperature rise of the stars. The cooling SSs behave within the brightness constraint of young compact objects when the colour superconductivity gap is small enough.
期刊：
EUROPEAN PHYSICAL JOURNAL C,2006年45(2):459-464 ISSN：1434-6044
通讯作者：
Liu, Hui
作者机构：
[Liu, Hui; Li, Jiarong; Hou, Defu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, Hui] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Viscosity;Field Theory;Elementary Particle;Quantum Field Theory;Shear Viscosity
摘要：
The shear viscosity of QED plasma at finite temperature and density is calculated by solving Boltzmann equation with variational approach. The result shows the small chemical potential enhances the viscosity in leading-log order by adding a chemical potential quadratic term to the viscosity for the pure temperature environment.
摘要：
We calculate the coefficient of bulk viscosity by considering the non-leptonic weak interactions in the cores of hybrid stars with both hyperons and quarks. We first determine the dependence of the production rate of neutrons on the reaction rate of quarks in the non-leptonic processes, that is,
<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\Gamma_n=K_S\ \Gamma_S\ +\ \Gamma_\Lambda\ +\ 2\Gamma_{\Sigma-}$</tex>
. The conversion rate, K
<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> s</inf>
, in our scenario is a complicated function of baryon number density. We also consider the medium effect of quark matter on bulk viscosity. Using these results, we estimate the limiting rotation of the hybrid stars, which may suppress the r-mode instability more effectively. Hybrid stars should be the candidates for the extremely rapid rotators.
