Zhanjiang, China
Zhanjiang, China

Zhanjiang Normal University is an institution of higher learning in the Chikan District of Zhanjiang City, Guangdong Province, China.The history of the university dates back to the "Leiyang Academy" founded in 1636. In 1904, it started its education training program. In 1978, it became Leizhou Normal College, and was elevated to Zhanjiang Normal University in 1991. Wikipedia.


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Mo J.-X.,Beijing Normal University | Mo J.-X.,Zhanjiang Normal University | Liu W.-B.,Beijing Normal University
European Physical Journal C | Year: 2014

To understand the effect of third order Lovelock gravity, P-V criticality of topological AdS black holes in Lovelock-Born-Infeld gravity is investigated. The thermodynamics is further explored with some more extensions and in some more detail than the previous literature. A detailed analysis of the limit case β → ∞ is performed for the seven-dimensional black holes. It is shown that, for the spherical topology, P-V criticality exists for both the uncharged and the charged cases. Our results demonstrate again that the charge is not the indispensable condition of P-V criticality. It may be attributed to the effect of higher derivative terms of the curvature because similar phenomenon was also found for Gauss-Bonnet black holes. For k=0, there would be no P-V criticality. Interesting findings occur in the case k=-1, in which positive solutions of critical points are found for both the uncharged and the charged cases. However, the P-v diagram is quite strange. To check whether these findings are physical, we give the analysis on the non-negative definiteness condition of the entropy. It is shown that, for any nontrivial value of α, the entropy is always positive for any specific volume v. Since no P-V criticality exists for k=-1 in Einstein gravity and Gauss-Bonnet gravity, we can relate our findings with the peculiar property of third order Lovelock gravity. The entropy in third order Lovelock gravity consists of extra terms which are absent in the Gauss-Bonnet black holes, which makes the critical points satisfy the constraint of non-negative definiteness condition of the entropy. We also check the Gibbs free energy graph and "swallow tail" behavior can be observed. Moreover, the effect of nonlinear electrodynamics is also included in our research. © 2014 The Author(s).


Mo J.-X.,Beijing Normal University | Mo J.-X.,Zhanjiang Normal University | Liu W.-B.,Beijing Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

In this Letter, the nature of phase transition at the critical point of P-V criticality in the extended phase space of RN-AdS black holes has been investigated. By treating the cosmological constant and its conjugate quantity as thermodynamic pressure and volume respectively, we introduce the original expressions of Ehrenfest equations directly into the black hole research instead of utilizing the analogy of Ehrenfest equations. We carry out an analytical check of Ehrenfest equations and prove that both Ehrenfest equations are satisfied. So the black hole undergoes a second order phase transition at the critical point. This result is consistent with the nature of liquid-gas phase transition at the critical point, hence deepening the understanding of the analogy of charged AdS black holes and liquid-gas systems. © 2013 Elsevier B.V.


Mo J.-X.,Zhanjiang Normal University | Mo J.-X.,Beijing Normal University | Li G.-Q.,Zhanjiang Normal University | Liu W.-B.,Beijing Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

In this Letter, we explore another novel Ehrenfest scheme which can also be utilized in the P-V criticality research of RN-AdS black holes. The novel form of Ehrenfest scheme is neither the one in classical thermodynamics nor the analogy one proposed for grand-canonical ensemble in literatures. After a detailed derivation of the novel Ehrenfest equations, an analytical check is carried out at the critical point of P-V criticality of RN-AdS black holes. It is shown once again that the phase transition at the critical point is a second order one. Both the novel Ehrenfest scheme developed in this Letter and the classical Ehrenfest equations utilized in our former research can be applied to investigate the nature of phase transition at the critical point of P-V criticality of AdS black holes. © 2014 The Authors.


Mo J.-X.,Beijing Normal University | Mo J.-X.,Zhanjiang Normal University | Liu W.-B.,Beijing Normal University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

To provide an analytic verification of the nature of phase transition at the critical point of P-V criticality, the original expressions of Ehrenfest equations have been introduced directly. By treating the cosmological constant and its conjugate quantity as thermodynamic pressure and volume, respectively, we carry out an analytical check of classical Ehrenfest equations. To show that our approach is universal, we investigate not only higher-dimensional charged AdS black holes, but also rotating AdS black holes. Not only are the examples of Einstein gravity shown, but also the example of modified gravity is presented for Gauss-Bonnet AdS black holes. The specific heat at constant pressure CP, the volume expansion coefficient α, and the isothermal compressibility coefficient κT are found to diverge exactly at the critical point. It has been verified that both Ehrenfest equations hold at the critical point of P-V criticality in the extended phase spaces of AdS black holes. So the nature of the critical point of P-V criticality of AdS black holes has been demonstrated analytically to be a second-order phase transition. These results are consistent with the nature of liquid-gas phase transition at the critical point. In this sense, our research would deepen the understanding of the relations of AdS black holes and liquid-gas systems. Moreover, our successful approaches to introduce the original expressions of Erhenfest equations directly into black hole phase transition research demonstrate again that black hole thermodynamics is closely related to classical thermodynamics, which allows us to borrow techniques from classical thermodynamics to investigate the thermodynamics of black holes. © 2014 American Physical Society.


Luo M.,Zhanjiang Normal University
Bulletin of the Korean Chemical Society | Year: 2014

Red fluorescent organic nanopaticles (FONs) based on a diarylacrylonitrile derivative conjugated molecule were facilely prepared by surfactant modification. Such red FONs showed excellent water solubility and biocompatibility, making them promising for cell imaging applications.


Lin B.,Zhanjiang Normal University
Computer Physics Communications | Year: 2013

In this work, we present a numerical method based on parametric cubic splines for solving the cubic nonlinear Schrödinger equation. The truncation error is given and it has been shown that by choosing suitable parameters we can obtain various accuracy schemes. Stability analysis of the method based on the von Neumann technique has been carried out and the method is shown to be unconditionally stable. The efficiency of the method is demonstrated by test problems. The lowest two conserved quantities are computed. The numerical simulations validate and demonstrate the advantages of the method. © 2012 Elsevier B.V. All rights reserved.


Li G.-Q.,Zhanjiang Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

In this Letter, we investigate the effects of dark energy on P-V criticality of charged AdS black holes by considering the case of the RN-AdS black holes surrounded by quintessence. By treating the cosmological constant as thermodynamic pressure, we study its thermodynamics in the extended phase space. It is shown that quintessence dark energy does not affect the existence of small/large black hole phase transition. For the case ωq = - 2/3 we derive analytic expressions of critical physical quantities, while for cases ωq ≠ - 2/3 we appeal to numerical method for help. It is shown that quintessence dark energy affects the critical physical quantities near the critical point. Critical exponents are also calculated. They are exactly the same as those obtained before for arbitrary other AdS black holes, which implies that quintessence dark energy does not change the critical exponents. © 2014 Elsevier B.V.


We present a one-step effective synthetic strategy for excellent thermally and mechanically reinforced pseudo-interpenetrating poly(propylene carbonate) networks (PIPPCNs) by CO2/propylene oxide/pyromellitic dianhydride terpolymerization. This strategy will enable PPC to be smoothly processed by heat without decomposition and to be used in a wider range of applications such as packaging, commodity and agriculture films. © 2013 The Royal Society of Chemistry.


Mo J.-X.,Zhanjiang Normal University
EPL | Year: 2014

In this letter, the original expressions of Erhenfest equations have been introduced directly into the black-hole research by treating the cosmological constant and its conjugate quantity as thermodynamic pressure and volume, respectively. The nature of phase transition at the critical point of P-V criticality of AdS black holes in f(R) gravity has been investigated as ane xample. The specific heat at constant pressure CP , the volume expansion coefficient ? and the isothermal compressibility coefficient ?T are found to diverge at the critical point. An analytical check of Ehrenfest equations has been carried out and it has been proved that both Ehrenfest equations are satisfied. So AdS black holes in f(R) gravity undergo a second-order phase transition at the critical point. This result is consistent with the nature of liquid-gas phase transition at the critical point and would help deepen the understanding of the relations between AdS black holes and liquid-gas system. Moreover, the influences of f(R) correction on the thermodynamics and the phase transition of AdS black holes in f(R) gravity have also been shown in this letter.© EPLA, 2014.


Xie M.,Zhanjiang Normal University | Pan R.,Zhanjiang Normal University
Journal of Alloys and Compounds | Year: 2013

Eu3+ and Sm3+ activated fluoro-apatite Ca 6La2Na2(PO4)6F 2 with chemical formulas Ca6La2- xLnxNa2(PO4)6F 2 (Ln = Eu3+, Sm3+) were prepared by a solid state reaction technique at high temperature. The photoluminescence results show that Ca6La2-xEuxNa 2(PO4)6F2 and Ca6La 2-xSmxNa2(PO4) 6F2 can be excited by near-ultraviolet light efficiently, then exhibit dominative emissions at ∼617 and 593 nm, respectively. To broaden the absorption at near-ultraviolet wavelength range and enhance Eu 3+ emission intensity under 400 nm excitation, Sm3+ ions are induced in the system, and the photoluminescence properties of Eu 3+/Sm3+ co-doped samples Ca6La 1.50-xSmxEu0.50Na 2(PO4)6F2 are investigated. © 2012 Elsevier B.V. All rights reserved.

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