Neijiang, China
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Wang B.J.,Panzhihua University | Jiang M.,Neijiang Normal College
Physica B: Condensed Matter | Year: 2011

The electron spin resonance spectra (characterized by g factors g, g⊥ and hyperfine structure constants A and A⊥) of Ba2Zn(HCOO)6(H2O) (BZFA): VO2 crystal are calculated from high order perturbation formulas. The calculated results are in good agreement with the observed values. The local structure parameters of [VO(H2O)5]2 clusters are also obtained from the calculation. The magnitudes of the metalligand distances parallel and perpendicular to the C4-axis are, respectively, R≈0.163 nm and R⊥≈0.210 nm. It is shown that the local structure around the V4 ion possesses a compressed tetragonal distortion along C4-axis. © 2011 Elsevier B.V. All rights reserved.


Wang B.J.,Panzhihua University | Jiang M.,Neijiang Normal College
Indian Journal of Physics | Year: 2012

The ESR and optical spectra of CuAlS2: V 3+ has been studied by using crystal- and ligand-field theory. The energy Hamiltonian and ESR formulae for 3d 2 electronic configurations at a tetragonal MX 4 complex have been derived from the two spin-orbital coupling parameters model. The contribution from the spin-orbit coupling of the ligand to ESR and optical spectra has been considered in the calculations. The calculated results are in good agreement with the experimental findings and show that V 3+ ion substitutes for Cu +-site. © 2012 IACS.


Gong J.T.,Mianyang Normal University | Wang L.J.,Neijiang Normal College | Wang L.J.,Southwest University for Nationalities | Feng W.L.,Chongqing University of Technology | Feng W.L.,CAS International Center for Materials Physics
Spectroscopy Letters | Year: 2010

On the basis of the perturbation formulas and 10 × 10 complete energy matrices for a d1 configuration ion in a tetragonal crystal field, for V4+ ions doped in cobalt maleate tetrahydrate (CoMTH) single crystals, the optical spectra and electron paramagnetic resonance (EPR) parameters (g factors g==, g//, g⊥ and hyperfine structure constants A==, A⊥) of the octahedral (VO6)8- clusters have been studied by two theoretical models. By simulating the calculated optical spectra and the EPR parameters to the observed values, the magnitude of orbital reduction factor k, core polarization constant j and crystal field parameters Bk q are determined. The calculated results are in reasonable agreement with the experimental values. values. © Taylor & Francis Group, LLC.


Feng W.-L.,Chongqing University of Technology | Chen T.-H.,China West Normal University | Wang L.-J.,Neijiang Normal College | Chen J.-J.,China West Normal University
Optik | Year: 2010

Based on the semi-self-consistent field (semi-SCF) d-orbital theory and point charge model, we have studied the optical spectra by the complete diagonalizing (of energy matrix) method (CDM) and electronic paramagnetic resonance (EPR) spectra by the perturbation theory method (PTM) for Ni2+ center in the ammonium nickel(II) sulfate hexahydrate [(NH4)2Ni(SO4)·6H2O, abbr. ANSH] crystal. The structural parameters of the ANSH crystal have been obtained and theoretical results agree well with the experimental findings. © 2008 Elsevier GmbH. All rights reserved.


Gong J.T.,Mianyang Normal University | Wang L.J.,Neijiang Normal College | Feng W.L.,Chongqing University of Technology | Feng W.L.,CAS International Center for Materials Physics | And 2 more authors.
Acta Physica Polonica A | Year: 2011

Based on crystal- and ligand-field theory, double-spin-orbital coupling approach was used to analyze the crystal-field energy levels and spin-Hamiltonian parameters of Ni2+ ion at trigonal site in CdBr2. The local lattice distortion (δR and ΤNi2+) is estimated from the crystal field parameters; the crystal field energy Hamiltonian was diagonalized in the full basis consisting of 45 wave functions of the Ni 2+ ion. Results of calculations are in good agreement with experimental data. The reasonableness of the theoretical results is discussed.


Dong C.,University of Chinese Academy of Sciences | Rui X.,University of Chinese Academy of Sciences | Guan X.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Li Y.,Neijiang Normal College
2nd International Conference on Information Science and Engineering, ICISE2010 - Proceedings | Year: 2010

There are two main limitations in Principal Component Analysis (PCA) and other traditional statistical methods: firstly, these methods only examine similarity among objects based on their attribute data, but ignore the spatial relationship among them, which means regions of geographical proximity often have similar features that can not be completely described by only a few economic attributes. Secondly, the information included in data may be incomplete because of the shortcomings in collecting process, but the missing information must be complemented in some way for obtaining more accurate results. So in this paper, the authors proposed to introduce spatial distance into traditional statistical methods to overcome these two defects, and chose a neural network method for making improvements to analyze civilian-owned economic statistics data of Sichuan province in 2007, and finally worked out a series of classification results for different spatial distance weight values. Based on these classification results, the authors discussed the reasonable range of spatial distance factor, and interpreted the meanings of this improvement from the point of view of the economic geography. It is proved that the classification results are consistent with the actual situation in this research. How to determine the distance factor is the key of successful application of this method. © 2010 IEEE.


Feng W.,Neijiang Normal College | Cheng G.,Chinawest Normal University
Advanced Materials Research | Year: 2010

The basic algorithm for the parallel FFT is briefly introduced, combined with the recent years of the parallel algorithm research results, analysis of a image processing model based on practical parallel algorithm. © (2010) Trans Tech Publications, Switzerland.


Gong J.-T.,Mianyang Normal University | Wang L.-J.,Neijiang Normal College
Spectroscopy Letters | Year: 2012

In this paper, a complete diagonalization (of energy matrix) procedure (CDP) is proposed to calculate the spin-Hamiltonian parameters [g-factors g, g and hyperfine structure constants A, A, which can be obtained from electron spin resonance (ESR) spectra] and d-d transitions (optical spectra) for d 9 ions in an orthorhombic field with D 2h symmetry. The calculated spin-Hamiltonian parameters and d-d transitions of ZnC 8H 14N 4O 6: Cu 2+ crystal from the CDP are in reasonable agreement with the experimental values. This suggests that the method is effective for the theoretical analysis of ESR and optical spectral data for 3d 9 ions with ground state 2B 2 in a D 2h symmetry. © 2012 Taylor and Francis Group, LLC.


Wu Y.,Mianyang Normal University | Wang L.-J.,Neijiang Normal College | Wang L.-J.,Southwest University for Nationalities | Liu G.-Y.,Mianyang Normal University
Crystal Research and Technology | Year: 2010

In this paper, the optical absorption and electron spin resonance (ESR) spectrum of Ni+-doped CuAlS2 crystals have been studied by using a double spin-orbit (SO) coupling approximation model, where the effects due to the SO coupling of the central metal 3d1 ion and those of ligands are included. From this model, the formulas of the ESR g factors g //, g⊥ and hyperfine structure constants A //, A⊥ for 3d1 ions in the tetragonal MX4 clusters are constructed. The optical absorption and ESR parameters for Cu+ sites of CuAlS2 have been calculated. The results obtained show that Ni+ ions substitute for Cu+ ions sites. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shao Y.Q.,Neijiang Normal College | Zhang Y.B.,Neijiang Normal College
Applied Mechanics and Materials | Year: 2013

In order to design the section size of a rectangular waveguide, this paper gives a new method to design the section size of a rectangular waveguide and the result obtained has important reference value for the design and research of sectional dimension. Based on the wave equation of electromagnetic wave, graphic method is employed to determine the transmission condition of fundamental mode in rectangular waveguide. We analyzed the power capacity and attenuation characteristics when the rectangular waveguide transmits with single-mode, and finally obtain the guidance condition for the power capacity reaches the maximum and the attenuation reaches the minimum in the rectangular waveguide. © (2013) Trans Tech Publications, Switzerland.

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