Guizhou Normal University is an institution of higher learning in Guiyang, Guizhou Province of the People's Republic of China.The university was founded in 1941, as National Guiyang Normal College . After the formation of the People's Republic of China, it was renamed Guiyang Normal College. In 1985, it became Guizhou Normal University. The university was accredited with being a provincial key university in Guizhou in 1996. In 2004, the former Guizhou Vocational Institute of Technology merged into the University. Wikipedia.
Shang Y.,Guizhou Normal University
Journal of Computational Physics | Year: 2013
Based on two-grid finite element discretization and a recent subgrid-scale model, a twolevel subgrid stabilized Oseen iterative method for the convection dominated Navier-Stokes equations is proposed and analyzed. This method combines the best algorithmic features of the two-grid discretization and subgrid stabilization methods. It first solves a subgrid stabilized nonlinear Navier-Stokes problem by applying m Oseen iterations on a coarse grid, and then solves a linear problem on a finer grid where the nonlinear convection term is fixed by the coarse grid solution. Stability of the method and error estimates of the discrete solution are analyzed. The algorithmic parameter scalings are also derived. Numerical results on an example with known analytical solution, the lid-driven cavity flow and the backward-facing step flow are given to verify the theoretical predictions and demonstrate the method's promise. © 2012 Elsevier Inc.
Bai Z.-Z.,Guizhou Normal University
Computing (Vienna/New York) | Year: 2010
For the singular, non-Hermitian, and positive semidefinite systems of linear equations, we derive necessary and sufficient conditions for guaranteeing the semi-convergence of the Hermitian and skew-Hermitian splitting (HSS) iteration methods.We then investigate the semi-convergence factor and estimate its upper bound for the HSS iterationmethod. If the semi-convergence condition is satisfied, it is shown that the semi-convergence rate is the same as that of the HSS iteration method applied to a linear system with the coefficient matrix equal to the compression of the original matrix on the range space of its Hermitian part, that is, the matrix obtained from the original matrix by restricting the domain and projecting the range space to the range space of the Hermitian part. In particular, an upper bound is obtained in terms of the largest and the smallest nonzero eigenvalues of the Hermitian part of the coefficient matrix. In addition, applications of the HSS iteration method as a preconditioner for Krylov subspace methods such as GMRES are investigated in detail, and several examples are used to illustrate the theoretical results and examine the numerical effectiveness of the HSS iterationmethod served either as a preconditioner forGMRES or as a solver. © 2010 Springer-Verlag.
Cong Y.,East China University of Science and Technology |
Tian B.,East China University of Science and Technology |
Zhang J.,East China University of Science and Technology |
Zhang J.,Guizhou Normal University
Applied Catalysis B: Environmental | Year: 2011
The microstructure and properties of nitrogen and lanthanum co-doped nanocrystalline titania photocatalysts have been studied. The catalyst samples were prepared in a homogeneous precipitation-hydrothermal process and characterized by XRD, XPS, UV-DRS and BET analyses. The results indicated that the nitrogen and La3+ doping could inhibit the phase transformation and crystallite growth of TiO2 and enhance the thermal stability of TiO2 structure. In addition, the experiment results showed that the thermal stability of TiO2 increased with the increasing of La3+ doping. The photocatalytic activities of samples for photodegradation of rhodamine B under visible light irradiation using different La3+ doping contents were also studied. There were optimal values of La3+ doping content for the La3+ doped and nitrogen/La3+ co-doped TiO2 corresponding the highest photodegradation percentages. The nitrogen and La3+ co-doped titania could greatly improve the photocatalytic activity in visible light irradiation, whose probable mechanism is a synergistic effect of co-doping. The nitrogen doping could narrow the band gap of titania and enhance the utilization efficiency of visible light, while the La3+ doping could accelerate the separation of photo-generated electrons and holes. Furthermore, the La3+ doping could increase the adsorption of organic pollutants on the surface of photocatalyst. © 2010 Elsevier B.V.
Yang Y.,Guizhou Normal University |
Han J.,Guizhou Normal University
Computer Methods in Applied Mechanics and Engineering | Year: 2015
Based on the work of Xu and Zhou (2000), this paper combines mixed finite element method and the local defect-correction technique to establish new local and parallel multilevel discretization schemes for the Stokes eigenvalue problem. Theoretical analysis and numerical experiments show that the computational approach proposed in this paper is simple and easy to carry out in parallel, and can be used to solve singular Stokes eigenvalue problem efficiently. This paper also discusses local error estimates of mixed finite element approximations; it is a new feature here that the estimates apply to the local domains containing corner points. © 2015 Elsevier B.V.
Li H.,Guizhou Normal University |
Yang Y.,Guizhou Normal University
Computers and Mathematics with Applications | Year: 2013
In this paper, adaptive finite element methods for differential operator eigenvalue problems are discussed. For multi-scale discretization schemes based on Rayleigh quotient iteration (see Scheme 3 in [Y. Yang, H. Bi, A two-grid discretization scheme based on shifted-inverse power method, SIAM J. Numer. Anal. 49 (2011) 1602-1624]), a reliable and efficient a posteriori error indicator is given, in addition, a new adaptive algorithm based on the multi-scale discretizations is proposed, and we apply the algorithm to the Schrödinger equation for hydrogen atoms. The algorithm is performed under the package of Chen, and satisfactory numerical results are obtained. © 2013 Elsevier Ltd. All rights reserved.
Peng J.-J.,Guizhou Normal University |
Peng J.-J.,Wuhan Textile University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2016
We derive the off-shell Noether current and potential in the context of Horndeski theory, which is the most general scalar-tensor theory with a Lagrangian containing derivatives up to second order while yielding at most to second-order equations of motion in four dimensions. Then the formulation of conserved charges is proposed on basis of the off-shell Noether potential and the surface term got from the variation of the Lagrangian. As an application, we calculate the conserved charges of black holes in a scalar-tensor theory with non-minimal coupling between derivatives of the scalar field and the Einstein tensor. © 2015 The Author.
Li L.W.,Guizhou Normal University
Laser Physics Letters | Year: 2016
A new strategy to obtain random lasing from semiconductor CdS nanoparticles is presented. A device is prepared with dye (DCM) solution containing CdS NPs. Good lasing behavior is reached and the multiple light scattering process is responsible for lasing generation. We also manage to show that the lasing modes and output intensity exhibit angular dependence. The result indicates that CdS nanoparticles can be used as ideal microlaser material in future semiconductor laser devices. © 2016 Astro Ltd.
Shang Y.,Guizhou Normal University |
He Y.,Xi'an Jiaotong University
Computer Methods in Applied Mechanics and Engineering | Year: 2012
Based on two-grid discretizations and domain decomposition, a parallel Oseen-linearized finite element algorithm for the stationary Navier-Stokes equations with moderate or large viscosity parameter is proposed and analyzed. The key idea of the algorithm is to first solve a nonlinear problem by Picard iterative method on a coarse grid, and then to solve an Oseen problem in parallel on a fine grid to correct the coarse grid solution. By using local a priori error estimate for the finite element solution and under the uniqueness condition, error bounds of the corresponding finite element solution are analyzed. Numerical results are also given to demonstrate the high efficiency of the algorithm. © 2011 Elsevier B.V.
Shang Y.,Guizhou Normal University
Computers and Fluids | Year: 2013
Two parallel defect-correction algorithms for the Navier-Stokes equations are presented. The algorithms are able to simulate high Reynolds numbers flows on relatively coarse grids. The parallel algorithms are easy to implement based on an existing sequential solver. The algorithms have low communication cost. Numerical results demonstrated the efficiency of the algorithms. Based on a fully overlapping domain decomposition technique and finite element discretization, two parallel defect-correction algorithms for the stationary Navier-Stokes equations with high Reynolds numbers are proposed and investigated. In these algorithms, each processor first solves an artificial viscosity stabilized Navier-Stokes equations by Newton or Picard iterative method, and then diffuses the system in the correction steps where only a linear problem needs to be solved at each step. All the computations are performed in parallel on global composite meshes that are fine around a particular subdomain and coarse elsewhere. The algorithms have low communication complexity. They can yield an approximate solution with an accuracy comparable to that of the standard finite element solution. Numerical tests demonstrated the effectiveness of the algorithms. © 2013 Elsevier Ltd.
Li C.H.,Guizhou Normal University
Proceedings - 2010 International Conference on Anti-Counterfeiting, Security and Identification, 2010 ASID | Year: 2010
RFID is a Radio Frequency Identification technology, which has a unique advantage in data collection and data transmission. Based on the expatiate of the identification principle, the system structure, and the characteristics of the RFID, this paper introduces the structure, technical target and application of the AVI system Based on the RFID. © 2010 IEEE.