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Search Results: 1 - 10 of 22209 matches for " Qian Luo "
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Does the Servitization Strategy Improve the Performance of Manufacturing Enterprises in China?  [PDF]
Lianxing Min, Jianqiong Wang, Qian Luo
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.55030
Abstract: There is a controversy of the relationship between servitization of manufacturing and business performance in the literature. Based on the data of Hu-Shen A-share listed manufacturing enterprises in 2013, this paper examined the relationship in the above with the traditional servitization level variable(SERL) and the servitization decision variable(SERD), which was generated in a dynamic perspective of strategic decision, to measure the servitization strategy. The empirical results showed that the servitization decision was positively correlated with the market performance (Tobin’s q), and the servitization level was negatively correlated with the financial performance, including return on assets (ROA), economic value added change rate (EVAC) and earnings per share (EPS). Further, we discussed the results from the signal theory and diversification discount theory.
Molecular dynamics for full QCD simulations with an improved action
Xiang-Qian Luo
Physics , 1996, DOI: 10.1016/0010-4655(95)00128-X
Abstract: I derive the equation of motion in molecular dynamics for doing full lattice QCD simulations with clover quarks. The even-odd preconditioning technique, expected to significantly reduce the computational effort, is further developed for the simulations.
Tricritical point of lattice QCD with Wilson quarks at finite temperature and density
Xiang-Qian Luo
Physics , 2004, DOI: 10.1103/PhysRevD.70.091504
Abstract: First principle study of QCD at finite temperature $T$ and chemical potential $\mu$ is essential for understanding a wide range of phenomena from heavy-ion collisions to cosmology and neutron stars. However, in the presence of finite density, the critical behavior lattice gauge theory without species doubling, is unknown. At strong coupling, we examine the phase structure on the $(\mu,T)$ plane, using Hamiltonian lattice QCD with Wilson fermions. A tricritical point is found, separating the first and second order chiral phase transitions. Such a tricritical point at finite $T$ has not been found in previous work in the Hamiltonian formalism with Kogut-Susskind fermions or naive fermions.
Glueball Masses in Quantum Chromodynamics
Xiang-Qian Luo
Physics , 1996, DOI: 10.1016/S0920-5632(96)00626-3
Abstract: We review the recent glueball mass calculations using an efficient method for solving the Schr\"odinger equation order by order with a scheme preserving the continuum limit. The reliability of the method is further supported by new accurate results for (1+1)-dimensional $\sigma$ models and (2+1)-dimensional non-abelian models. We present first and encouraging data for the glueball masses in 3+1 dimensional QCD.
Eigenmodes of the Dirac Operator and Chiral Properties of QCD with Sea Quarks
Xiang-Qian Luo
Physics , 1998, DOI: 10.1016/S0920-5632(99)85152-4
Abstract: I describe a mechanism to understand the relation between chiral-symmetry breaking and eigenmodes of the Dirac operator in lattice QCD with Kogut-Susskind sea quarks. It can be shown that if chiral symmetry is spontaneously broken, the eigenvalues $\lambda_i$ should behave as $z(i)/V$ for large volume $V$, where $z(i)$ is the i-th zero of the Bessel function. With neither chiral nor $\lambda$ extrapolation, one can precisely calculate the chiral condensate using only a small set of eigenvalues. Therefore, it is economical and free of systematic uncertainties. I present the first QCD data to support this mechanism and encourage the lattice community to test and use it.
Spontaneous chiral-symmetry breaking of lattice QCD with massless dynamical quarks
Xiang-Qian Luo
Physics , 2005,
Abstract: One of the most challenging issues in QCD is the investigation of spontaneous chiral-symmetry breaking, which is characterized by the non-vanishing chiral condensate when the bare fermion mass is zero. In standard methods, one has to perform expensive lattice simulations at multiple bare quark masses, and employ some modeled function to extrapolate the data to the chiral limit. This paper applies the probability distribution function method to computing the chiral condensate in lattice QCD with massless dynamical quarks, without any ambiguous mass extrapolation. The results for staggered quarks indicates that the method might be a more efficient alternative for investigating the spontaneous chiral-symmetry breaking in lattice QCD.
Simulating the vacuum properties of QCD with dynamical quarks
Xiang-Qian Luo
Physics , 1997, DOI: 10.1016/S0920-5632(97)00915-8
Abstract: The vacuum properties of lattice QCD with staggered quarks are investigated by an efficient simulation method. I present data for the quark condensate with flavor number $N_f=0, ~ 1, ~ 2, ~ 3, ~ 4$ and many quark masses, including the vacuum energy in the chiral limit. Obvious sea quark effects are observed in some parameter space. I also describe a mechanism to understand this and a formula relating the chiral condensate and zero modes.
Thermodynamical quantities of lattice full QCD from an efficient method
Xiang-Qian Luo
Physics , 2001, DOI: 10.1142/S0217732301004777
Abstract: I extend to QCD an efficient method for lattice gauge theory with dynamical fermions. Once the eigenvalues of the Dirac operator and the density of states of pure gluonic configurations at a set of plaquette energies (proportional to the gauge action) are computed, thermodynamical quantities deriving from the partition function can be obtained for arbitrary flavor number, quark masses and wide range of coupling constants, without additional computational cost. Results for the chiral condensate and gauge action are presented on the $10^4$ lattice at flavor number $N_f=0$, 1, 2, 3, 4 and many quark masses and coupling constants. New results in the chiral limit for the gauge action and its correlation with the chiral condensate, which are useful for analyzing the QCD chiral phase structure, are also provided.
Large scale simulations of lattice gauge theory: key NSF project of China and recent developments
Xiang-Qian Luo
Physics , 2003, DOI: 10.1016/S0920-5632(03)02752-X
Abstract: In a recent funded Key Project of National Science Foundation of China, we have planned to do large scale simulations of lattice Quantum Chromodynamics, using the parallel supercomputing facilities in mainland China. Here I briefly review our plan and progress in recent years.
Chiral condensate of lattice QCD with massless quarks from the probability distribution function method
Xiang-Qian Luo
Physics , 2004, DOI: 10.1103/PhysRevD.69.076012
Abstract: We apply the probability distribution function method to the study of chiral properties of QCD with quarks in the exact massless limit. A relation among the chiral condensate, zeros of the Bessel function and eigenvalue of Dirac operator is also given. The chiral condensate in this limit can be measured with small number of eigenvalues of the massless Dirac operator and without any ambiguous mass extrapolation. Results for SU(3) gauge theory with quenched Kogut-Susskind quarks on the $10^4$ lattice are shown.
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