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Search Results: 1 - 10 of 148263 matches for " Z. W. Lin "
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Recent Developments of A Multi-Phase Transport Model
Z. W. Lin
Physics , 2014,
Abstract: After the public release of A Multi-Phase Transport (AMPT) model in 2004 and detailed descriptions of its physics in a 2005 paper, the model has been constantly updated and developed to make it more versatile and to include more physical processes. This an overview of recent developments of the AMPT model. Ongoing work to fix the violation of charge conservation in the code as well as possible directions for future work are also discussed.
Genetic Differentiation Caused by Chromium Treatment in Leersia hexandra Swartz Revealed by RAPD Analysis  [PDF]
X. W. Cai, Y. Shao, Z. M. Lin
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.410037
Abstract: Randomly amplified polymorphic DNA (RAPD) technique was applied to assess the genetic variations and phylogenetic relationships in genetic differentiation within 4 Chromium-treatment Leersia hexandra. The fresh leaves of Leersia hexandra cultivated on the condition of chrome pollution and exogenous organic acids were used as experimental material. The genomic DNA of Leersia hexandra was extracted by using CTAB method. The results showed that different samples of Leersia hexandra exhibited DNA polymorphism when using the random primer S43, S51and S55 as the primers in the RAPD reaction. One specific DNA band about 1000 bp was found in the sample which treated with 10 mmol/L concentration EDTA when used the S43 primer to RAPD. The obvious differences between different EDTA-treatment levels suggest that EDTA has certain effects on enrichment to heavy metals of Leersia hexandra, it will be more favored to Leersia hexandra accumulation of chromium when EDTA concentration increased.
Charmonium absorption cross section by nucleon
W. Liu,C. M. Ko,Z. W. Lin
Physics , 2001, DOI: 10.1103/PhysRevC.65.015203
Abstract: The $J/\psi$ absorption cross section by nucleon is studied using a gauged SU(4) hadronic Lagrangian but with empirical particle masses, which has been used previously to study the $J/\psi$ absorption cross section by pion and rho meson. Including both two-body and three-body final states, we find that with a cutoff parameter of 1 GeV at interaction vertices involving charm hadrons, the $J/\psi-N$ absorption is at most 5 mb and is consistent with that extracted from $J/\psi$ production from both photo-nuclear and proton-nucleus reactions.
Multipole Gravitational Lensing and High-order Perturbations on the Quadrupole Lens
Z. Chu,W. P. Lin,G. L. Li,X. Kang
Physics , 2013, DOI: 10.1088/0004-637X/765/2/134
Abstract: An arbitrary surface mass density of gravitational lens can be decomposed into multipole components. We simulate the ray-tracing for the multipolar mass distribution of generalized SIS (Singular Isothermal Sphere) model, based on the deflection angles which are analytically calculated. The magnification patterns in the source plane are then derived from inverse shooting technique. As have been found, the caustics of odd mode lenses are composed of two overlapping layers for some lens models. When a point source traverses such kind of overlapping caustics, the image numbers change by \pm 4, rather than \pm 2. There are two kinds of images for the caustics. One is the critical curve and the other is the transition locus. It is found that the image number of the fold is exactly the average value of image numbers on two sides of the fold, while the image number of the cusp is equal to the smaller one. We also focus on the magnification patterns of the quadrupole (m = 2) lenses under the perturbations of m = 3, 4 and 5 mode components, and found that one, two, and three butterfly or swallowtail singularities can be produced respectively. With the increasing intensity of the high-order perturbations, the singularities grow up to bring sixfold image regions. If these perturbations are large enough to let two or three of the butterflies or swallowtails contact, eightfold or tenfold image regions can be produced as well. The possible astronomical applications are discussed.
Partonic Effects in Heavy Ion Collisions at RHIC
C. M. Ko,Z. W. Lin,S. Pal
Physics , 2002, DOI: 10.1556/APH.17.2003.2-4.6
Abstract: Effects of partonic interactions in heavy ion collisions at RHIC are studied in a multiphase transport model (AMPT) that includes both initial partonic and final hadronic interactions.It is found that a large parton scattering cross section is needed to understand the measured elliptic flow of pions and two-pion correlation function.
Magnetic Moments of $J^P={3/2}^+$ Pentaquarks
W. -W. Li,Y. -R. Liu,P. -Z. Huang,W. -Z. Deng,X. -L. Chen,Shi-Lin Zhu
Physics , 2003,
Abstract: If the $J^P$ of $\Theta_5^+$ and $\Xi_5^{--}$ pentaquarks is really found to be ${1\over 2}^+$ by future experiments, they will be accompanied by $J^P={3\over 2}^+$ partners in some models. It is reasonable to expect that these $J^P={3\over 2}^+$ states will also be discovered in the near future with the current intensive experimental and theoretical efforts. We estimate $J^P={3/2}^+$ pentaquark magnetic moments using different models.
Pentaquark Magnetic Moments In Different Models
Y. -R. Liu,P. -Z. Huang,W. -Z. Deng,X. -L. Chen,Shi-Lin Zhu
Physics , 2003, DOI: 10.1103/PhysRevC.69.035205
Abstract: We calculate the magnetic moments of the pentaquark states from different models and compare our results with predictions of other groups.
Strong Coupling Superconductivity in Iron-Chalcogenide FeTe$_{0.55}$Se$_{0.45}$
W. K. Park,C. R. Hunt,H. Z. Arham,Z. J. Xu,J. S. Wen,Z. W. Lin,Q. Li,G. D. Gu,L. H. Greene
Physics , 2010,
Abstract: The superconducting order parameter in the iron-chalcogenide superconductor FeTe$_{0.55}$Se$_{0.45}$ ($T_\textrm{c}$ = 14.2 K) is investigated by point-contact Andreev reflection spectroscopy. The energy gap magnitude (3.8 meV at 1.70 K) and temperature dependence as extracted from the Andreev conductance spectra reveal strong-coupling superconductivity and is consistent with $s$-wave order parameter symmetry. No clear evidence for multiple order parameters or interference from multiple bands is observed. A conductance enhancement persists above $T_\textrm{c}$ to $\sim 18-20$ K and possible origins, including novel quasiparticle scattering due to strong antiferromagnetic spin fluctuations, are discussed.
Electronic correlations and unusual superconducting response in the optical properties of the iron-chalcogenide FeTe0.55Se0.45
C. C. Homes,A. Akrap,J. S. Wen,Z. J. Xu,Z. W. Lin,Q. Li,G. D. Gu
Physics , 2010, DOI: 10.1103/PhysRevB.81.180508
Abstract: The in-plane complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 have been determined above and below the critical temperature Tc = 14 K. At room temperature the conductivity is described by a weakly-interacting Fermi liquid; however, below 100 K the scattering rate develops a frequency dependence in the terahertz region, signaling the increasingly correlated nature of this material. We estimate the dc conductivity just above Tc to be sigma_dc ~ 3500 Ohm-1cm-1 and the superfluid density rho_s0 ~ 9 x 10^6 cm-2, which places this material close to the scaling line rho_s0/8 ~ 8.1 sigma_dc Tc for a BCS dirty-limit superconductor. Below Tc the optical conductivity reveals two gap features at Delta_1,2 ~ 2.5 and ~ 5.1 meV.
$J^P={1/2}^-$ Pentaquarks in Jaffe and Wilczek's Diquark Model
A. Zhang,Y. -R. Liu,P. -Z. Huang,W. -Z. Deng,X. -L. Chen,Shi-Lin Zhu
Physics , 2004,
Abstract: If Jaffe and Wilczek's diquark picture for $\Theta_5$ pentaquark is correct, there should also exist a $SU_F$(3) pentaquark octet and singlet with no orbital excitation between the diquark pair, hence $J^P={1/2}^-$. These states are lighter than the $\Theta_5$ anti-decuplet and lie close to the orbitally excited (L=1) three-quark states in the conventional quark model. We calculate their masses and magnetic moments and discuss their possible strong decays using the chiral Lagrangian formalism. Among them two pentaquarks with nucleon quantum numbers may be narrow. Selection rules of strong decays are derived. We propose the experimental search of these nine additional $J^P={1/2}^-$ baryon states. Especially there are two additional $J^P={1/2}^-$ $\Lambda$ baryons around $\Lambda (1405)$. We also discuss the interesting possibility of interpreting $\Lambda (1405)$ as a pentaquark. The presence of these additional states will provide strong support of the diquark picture for the pentaquarks. If future experimental searches fail, one has to re-evaluate the relevance of this picture for the pentaquarks.
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