Datong, China

Shanxi Datong University

Datong, China

Shanxi Datong University is a university in Datong, Shanxi, China. It used to be a 2-year normal school to prepare teachers for elementary schools. Wikipedia.

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Ling Y.,Shanghai JiaoTong University | Ling Y.,Shanxi Datong University | Cai X.,Shanghai JiaoTong University
Renewable and Sustainable Energy Reviews | Year: 2012

Wind energy, as a reliable, natural and renewable electrical power supply, produces no emissions and so it is an excellent alternative to conventional, more heavily polluting fuels in the long term based on the worldwide concern about the environment and energy supply. Wind energy resources in China are affluent, but its distribution are uneven, centralized, and far from both the utility and the high electricity demand markets. This made China's onshore wind power development have such characteristics as large scale, high centralization and far transmission, which is different with that in Europe, where the characteristics are even distribution, decentralized. In past two decades, considering the economic, technical and environmental benefits of wind power, China has given priority to its development. Besides the dramatic growth of large scale grid-connected wind power, household-scale wind power has been used most successfully in remote rural regions in China. Therefore, the development of wind power will be of great importance to alleviate the energy crisis and environmental pollution resulting from the rapid economic growth of China in the future. In this paper, the current development of wind energy utilization in China is investigated, and some critical barriers are discussed. Finally, the perspective of wind energy utilization is presented, where focuses are placed on seven wind power bases. © 2012 Elsevier Ltd. All rights reserved.

Du S.,Xiamen University | Bai Z.,Xiamen University | Guo Y.,Shanxi Datong University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

We build in this paper the counterpart of the celebrated Nielsen theorem for coherence manipulation. This offers an affirmative answer to the open question: whether, given two states ρ and σ, either ρ can be transformed into σ or vice versa under incoherent operations [Baumgratz, Phys. Rev. Lett. 113, 140401 (2014)PRLTAO0031-900710.1103/PhysRevLett.113.140401]. As a consequence, we find that there exist essentially different types of coherence. Moreover, incoherent operations can be enhanced in the presence of certain coherent states. These extra states are coherent catalysts: they allow uncertain incoherent operations to be realized without being consumed in any way. Our main result also sheds light on the construction of coherence measures. © 2015 American Physical Society.

Ma M.-S.,Shanxi Datong University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We study the effects of quantum gravitational correction on the thermodynamics of black holes in the asymptotic safety scenario. Owing to the quantum-corrected Schwarzschild metric, the thermodynamic quantities are also corrected and a Hawking-Page-type phase transition may exist. We also employ the concept of thermodynamic geometry to the black hole to characterize the phase transition. By introducing a cavity enclosing the black hole, we apply the spatially finite boundary conditions to further investigate the thermodynamic phase transition of the black hole. It is shown that the larger and small black holes are both locally stable according to heat capacity. According to free energy, we find that the quantum-corrected black hole has similar thermodynamic phase structure to that of RN-AdS black hole. In addition, we also discuss the possibility of the phase transition between the black hole and the hot curved space. Above a certain temperature T0, the black hole is more probable than the hot space. © 2014 Elsevier B.V.

Zhao R.,Shanxi Datong University | Zhao H.-H.,Shanxi Datong University | Ma M.-S.,Shanxi Datong University | Zhang L.-C.,Shanxi Datong University
European Physical Journal C | Year: 2013

In this paper, we study the phase structure and equilibrium state space geometry of charged topological dilaton black holes in (n+1)-dimensional anti-de Sitter spacetime. By considering the pairs of parameters (P~V) and (Q~U) as variables, we analyze the phase structure and critical phenomena of black holes and discuss the relation between the two kinds of critical phenomena. We find that the phase structures and critical phenomena drastically depend on the cosmological constant l (or the static electric charge Q of the black holes), dimensionality n and dilaton field Φ. © 2013 Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica.

Ma M.-S.,Shanxi Datong University | Liu F.,Shanxi Datong University | Zhao R.,Shanxi Datong University
Classical and Quantum Gravity | Year: 2014

We study the phase transition and the critical behavior of the BTZ black hole with torsion obtained in (1 + 2)-dimensional Poincaré gauge theory. According to Ehrenfest's classification, when the parameters in the theory are arranged properly, the BTZ black hole with torsion may possess the second-order phase transition which is also a smaller mass/larger mass black hole phase transition. Nevertheless, the critical behavior is different from the one in the van der Waals liquid/gas system. We also calculated the critical exponents of the relevant thermodynamic quantities, which are the same as the ones obtained in the Hořava-Lifshitz black hole and the Born-Infeld black hole. © 2014 IOP Publishing Ltd.

Zhang L.-C.,Shanxi Datong University | Li H.-F.,Shanxi Datong University | Zhao R.,Shanxi Datong University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

Using the new global embedding approach and analytical continuation method of wave function we discuss Hawking radiation of acoustic black holes. Unruh-Hawking temperature of the acoustic black hole is derived. The corresponding relation between these methods calculating Hawking radiation of acoustic black hole is established. The calculation result shows that the contributions of chemical potential to the ingoing wave and the outgoing wave are the same. © 2011 Elsevier B.V.

Ma M.-S.,Shanxi Datong University | Zhao R.,Shanxi Datong University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2014

In this paper, we study the phase transition and the entropy spectrum of the Bañados-Teitelboim-Zanelli (BTZ) black hole with torsion obtained in (1+2)-dimensional Poincaré gauge theory. By calculating the heat capacity, we find that the BTZ black hole with torsion we consider will experience phase transition at some critical point. This indicates that the critical behaviors of black holes do not only depend on the geometry of spacetime, but also have to do with the theory of gravity under consideration. In addition, we derive the entropy spectrum of the BTZ black hole according to the quasinormal modes and the adiabatic invariance. It shows that the area or entropy spectrum will also rely on the concrete gravitational action. © 2014 American Physical Society.

Li H.-F.,Shanxi Datong University
Journal of High Energy Physics | Year: 2013

We take advantage of the Sturm-Liouville eigenvalue problem to analytically study the holographic insulator/superconductor phase transition in the probe limit. The interesting point is that this analytical method can not only estimate the most stable mode of the phase transition, but also the second stable mode. We find that this analytical method perfectly matches with other numerical methods, such as the shooting method. Besides, we argue that only Dirichlet boundary condition of the trial function is enough under certain circumstances, which will lead to a more precise estimation. This relaxation for the boundary condition of the trial function is first observed in this paper as far as we know. © 2013 SISSA, Trieste, Italy.

Ma M.-S.,Shanxi Datong University
Annals of Physics | Year: 2015

We obtain a magnetically charged regular black hole in general relativity. The source to the Einstein field equations is nonlinear electrodynamic field in a physically reasonable model of nonlinear electrodynamics (NED). "Physically" here means the NED model is constructed on the basis of three conditions: the Maxwell asymptotic in the weak electromagnetic field limit; the presence of vacuum birefringence phenomenon; and satisfying the weak energy condition (WEC). In addition, we analyze the thermodynamic properties of the regular black hole in two ways. According to the usual black hole thermodynamics, we calculate the heat capacity at constant charge, from which we know the smaller black hole is more stable. We also employ the horizon thermodynamics to discuss the thermodynamic quantities, especially the heat capacity at constant pressure. © 2015 Elsevier Inc.

Ma M.-S.,Shanxi Datong University | Zhao R.,Shanxi Datong University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

On the basis of horizon thermodynamics we study the thermodynamic stability of black holes constructed in general relativity and Gauss-Bonnet gravity. In the framework of horizon thermodynamics there are only five thermodynamic variables E, P, V, T, S. It is not necessary to consider concrete matter fields, which may contribute to the pressure of black hole thermodynamic system. In non-vacuum cases, we can derive the equation of state, P= P(V, T). According to the requirements of stable equilibrium in conventional thermodynamics, we start from these thermodynamic variables to calculate the heat capacity at constant pressure and Gibbs free energy and analyze the local and global thermodynamic stability of black holes. It is shown that P> 0 is the necessary condition for black holes in general relativity to be thermodynamically stable, however this condition cannot be satisfied by many black holes in general relativity. For black hole in Gauss-Bonnet gravity negative pressure can be feasible, but only local stable black hole exists in this case. © 2015 The Authors.

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