作者机构：
[C. B. Yang] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430079, People's Republic of China;[C. B. Yang; Rudolph C. Hwa] Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203, USA
摘要：
The recombination model is applied to the production of K , ϕ , Λ , and Ω at all p T in central Au+Au collisions. The thermal-shower component of the recombination is found to be important for K and Λ, but only in a minor way for ϕ and Ω in the intermediate to high p T region. The normalization and inverse slope of the thermal partons in the strange sector are determined by fitting the low- p T data. At higher p T the data of K , Λ , ϕ , and Ω in the log scale are all well reproduced in our study that extends the thermal contribution and includes the shower contribution. The calculated result on the Λ / K ratio rises to a maximum of around 2 at p T ≈ 4 GeV/ c , arching over the data in linear scale. The production of ϕ and Ω are shown to arise mainly from the recombination of thermal partons, thus exhibiting exponential p T dependences in agreement with the data. Their ratio, R Ω / ϕ , rises linearly to p T ≈ 4 GeV/ c and develops a maximum at p T ≈ 5 . 5 GeV/ c . It is argued that the p T spectra of ϕ and Ω reveal directly the partonic nature of the thermal source that characterizes quark-gluon plasma. Comments are made on the Ω puzzle due to the simultaneous observation of both the exponential behavior of the Ω spectrum in p T and the existence of low- p T particles associated with Ω as trigger.
作者机构：
CCAST, World Lab, Beijing 100080, Peoples R China.;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Inst High Energy Phys, Beijing 100049, Peoples R China.;[Huang, F.] CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
通讯机构：
[Huang, F.] C;CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
摘要：
A preliminary investigation of K¯N interaction is performed within a chiral constituent quark model by solving the resonating group method (RGM) equation. The model parameters are taken from our previous work, which gave a satisfactory description of the S-, P-, D-, F-wave KN scattering phase shifts. The channel-coupling between K¯N,πΛ and πΣ is considered, and the scattering phase shifts as well as the bound-state problem of K¯N are dynamically studied. The results show that the S-wave K¯N interaction in the isospin I=0 channel is attractive, and in the extended chiral SU(3) quark model such an attraction can make for a K¯N bound state, which appears as a πΣ resonance in the coupled-channel calculation, while the chiral SU(3) quark model cannot accommodate the existence of a K¯N bound state. It seems that the vector meson exchanges are necessary to be introduced in the quark-quark interactions if one tries to explain the Λ(1405) as a K¯N bound state or a πΣ- K¯N resonance state.
作者机构：
[Liu, Lianshou; Xu, Mingmei; Yu, Meiling] Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China
摘要：
The hadronization scheme for parton transport in relativistic heavy ion collisions is studied by using Monte Carlo simulation. A simple model is proposed, which has a collective phase transition following a super-cooling, instead of letting the particles to freeze out one by one as done in the traditional event generators. It turns out that the modified model with a sudden phase transition is able to reproduce the experimental longitudinal distributions of final state particles better than the one without phase transition does. The possibility of implementing a transition between different phases other than of the first order is discussed.
通讯机构：
[Li, W.] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
scaling law;transportation network;complex system
摘要：
We present a detailed, empirical analysis of the statistical properties of the China Railway Network (CRN) consisting of 3915 nodes (train stations) and 22 259 edges (railways). Based on this, CRN displays two explicit features already observed in numerous real-world and artificial networks. One feature, the small-world property, has the fingerprint of a small characteristic shortest-path length, 3.5, accompanied by a high degree of clustering, 0.835. Another feature is characterized by the scale-free distributions of both degrees and weighted degrees, namely strengths. Correlations between strength and degree, degree and degree, and clustering coefficient and degree have been studied and the forms of such behaviors have been identified. In addition, we investigate distributions of clustering coefficients, topological distances, and spatial distances.
摘要：
Structural properties of the ship-transport network of China (STNC) are studied in the light of recent investigations of complex networks. STNC is composed of a set of routes and ports located along the sea or river. Network properties including the degree distribution, degree correlations, clustering, shortest path length, centrality, and betweenness are studied in different definitions of network topology. It is found that geographical constraint plays an important role in the network topology of STNC. We also study the traffic flow of STNC based on the weighted network representation, and demonstrate the weight distribution can be described by power-law or exponential function depending on the assumed definition of network topology. Other features related to STNC are also investigated.
作者机构：
[Jia, Ya] Cent China Normal Univ, Sch Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Biophys, Wuhan 430079, Peoples R China.;Jianghan Univ, Dept Phys, Wuhan 430056, Peoples R China.
通讯机构：
[Jia, Ya] C;Cent China Normal Univ, Sch Phys, Wuhan 430079, Peoples R China.
关键词：
Chemical Langevin equation;Finite molecule number;Intracellular calcium oscillations
作者机构：
[Xiong Heng-Na; Guo Hong; Xiong, HN] Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Xiong Heng-Na] H;Huazhong Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
Entanglement;Intensity-Dependent;Theoretical
摘要：
We consider a theoretical scheme for entanglement transfer between a two-mode squeezed vacuum field and two initially separable atoms through intensity-dependent couplings. We find that the entanglement transfer between the field and the atoms has an exact period for any given squeezing. We also find that the maximum achievable entanglement of the atomic subsystem is a simple increasing function of r. For sufficiently large squeezing parameter r, it is possible for the atoms to be entangled into a Bell state at half the periodic time points.
作者机构：
[Zhang, Ben-Wei] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.;Univ Regensburg, Inst Theoret Phys, D-8400 Regensburg, Germany.;Texas A&M Univ, Cyclotron Inst, College Stn, TX 77843 USA.;Lawrence Berkeley Lab, Nucl Sci Div, Berkeley, CA 94720 USA.
通讯机构：
[Zhang, Ben-Wei] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.
会议名称：
2nd International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions
会议时间：
JUN 09-16, 2006
会议地点：
Pacific Grove q, CA
会议主办单位：
Huazhong Normal Univ, Inst Particle Phys, Wuhan 430070, Peoples R China.^Univ Regensburg, Inst Theoret Phys, D-8400 Regensburg, Germany.^Texas A&M Univ, Cyclotron Inst, College Stn, TX 77843 USA.^Lawrence Berkeley Lab, Nucl Sci Div, Berkeley, CA 94720 USA.
摘要：
Quark-quark double scattering in eA DIS and its contribution to quark and anti-quark fragmentation functions are investigated with the generalized factorization of the relevant twist-four processes in pQCD. It is shown that the resulting modifications to quark and anti-quark fragmentation functions are different. While the numerical size of these effects cannot be determined from pQCD, the structure of our result leads to a number of qualitative predictions for the relative size of the effect for different hadrons. These qualitative predictions agree with the multiplicity ratios for positive and negative hadrons as observed by HERMES.
作者：
Elsanousi, Ammar*;Elssfah, E. M.;Zhang, J.;Lin, J.;Song, H. S.;...
期刊：
Journal of Physical Chemistry C,2007年111(39):14353-14357 ISSN：1932-7447
通讯作者：
Elsanousi, Ammar
作者机构：
[Elsanousi, Ammar; Elssfah, E. M.; Song, H. S.; Tang, Chengcun; Zhang, J.; Lin, J.] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Elsanousi, Ammar] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Titanate nanotubes and nanoribbons have been synthesized hydrothermally using commercial anatase nanopowder (particle size ≈50−400 nm) and NaOH. The samples were characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (TEM−SAED), and X-ray diffraction (XRD). It has been found that the hydrothermal temperature and the treatment duration have a strong effect on the morphology control of the resulting products. At a fixed temperature of 180 °C, the morphology of the products changes with the hydrothermal duration (5−72 h). Hollow nanotubes with an outer diameter of about 10 nm were formed at treatment durations between 5 and 20 h. Bundles of nanoribbons with widths ranging from 50 to 500 nm and lengths up to several tens of micrometers were produced at a treatment duration of 72 h. Experimental results on samples treated at different temperatures (135−195 °C) for different durations revealed the transformation of the nanotubes into nanoribbons after specific treatment duration at any selected temperature, so we predict that optimizing the hydrothermal temperature and treatment duration may lead to a better control of the product morphology.
作者机构：
[Hu, Xiang-Ming; Xu, Jun] Department of Physics, Huazhong Normal University, Wuhan 4300, China
通讯机构：
[Hu, Xiang-Ming] H;Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China.
摘要：
We propose a scheme of atom localization based on the interaction of the atom in the Λ configuration with a strong bichromatic coupling field and a weak bichromatic probe field with equal frequency difference. One of the bichromatic coupling components is a standing-wave field, which imposes position information on the Rabi frequency. By varying the difference between the relative phases of the two bichromatic fields, the atom is localized in either of the two half-wavelength regions with 50% probability provided the population in the upper state is detected.
作者机构：
[谢凌; 谢文武; 刘守印] College of Physical Science and Technology, Huazhong Normal Umiersity
关键词：
四阶累积量;MIMO信道估计;相关性估计
摘要：
MI MO技术一直受到人们的广泛关注,并被广泛采用于各种移动通信系统的标准化协议中.在此系统中用到的分集合并和空时解码技术都需要以准确估计的信道状态信息为前提条件,以往的信道估计都是在MI MO系统子信道间是非相关的假设下进行的.事实上,由于天线之间距离的限制和传播路径散射体的不充分,子信道之间常常存在一定的相关性,常称为空间相关.另外,在信道估计、天线选择和自适应调制等方面需要已知（估计）这一参数.但是,要精确估计信道的相关性非常困难,到目前为止,这一问题没有得到很好的解决,以至于在大部分关于信道估计的文献中都是预先假定已知信道的相关特性.本文运用四阶累积量理论对MI MO信道及其相关矩阵进行了估计.仿真结果表明,本文所提出的方法具有较高的估计精度.
