Entity

Time filter

Source Type

Guilin, China

Guangxi Normal University is a university located in Guilin, Guangxi, China. Wikipedia.


Wang W.,Guangxi Normal University | Liu X.,Nanjing Southeast University
Computers and Mathematics with Applications | Year: 2013

This article proposes an approach to multi-attribute decision making (MADM) where individual assessments are provided as interval-valued intuitionistic fuzzy numbers (IVIFNs). Firstly, some Einstein geometric operators on interval-valued intuitionistic fuzzy sets, such as Einstein product, Einstein exponentiation etc., and their characteristics are introduced. Secondly, some Einstein geometric operators, such as the interval-valued intuitionistic fuzzy Einstein weighted geometric operator, interval-valued intuitionistic fuzzy Einstein ordered weighted geometric operator and interval-valued intuitionistic fuzzy Einstein hybrid weighted geometric (IV IFHWGε) operator, are developed for aggregating the IVIFNs. Moreover, various properties of these operators are established. Finally, an IV IFHWGε operator based approach to MADM under interval-valued intuitionistic fuzzy environments is proposed. An illustrative propulsion/manoeuvring system selection problem is employed to demonstrate how to apply the proposed procedure and verify the feasibility and effectiveness of the developed method. © 2013 Elsevier Ltd. All rights reserved.


Liang W.H.,Guangxi Normal University | Liang W.H.,University of Valencia | Oset E.,University of Valencia
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We describe the B0 and Bs0 decays into J/ψ f0(500) and J/ψ f0(980) by taking into account the dominant process for the weak decay of B0 and Bs0 into J/ψ and a qq- component. After hadronization of this qq- component into pairs of pseudoscalar mesons we obtain certain weights for the meson-meson components and allow them to interact among themselves. The final state interaction of the meson-meson components, described in terms of chiral unitary theory, gives rise to the f0(980) and f0(500) resonances and we can obtain the π +π - invariant mass distributions after the decay of the resonances, which allows us to compare directly to the experiments. We obtain ratios of J/ψ f0(980) and J/ψ f0(500) for each of the B decays in quantitative agreement with experiment, with the f0(980) clearly dominant in the Bs0 decay and the f0(500) in the B0 decay. © 2014 The Authors.


Liu Y.,Guangxi Normal University
International Journal of Electrochemical Science | Year: 2013

The electrocatalytic oxidation of formaldehyde on poly(1-naphthylamine)-nickel modified glassy carbon electrode (P(NA)-Ni/GCE) was developed. This involves in situ electropolymerization of 1-naphthylamine at glassy carbon electrode, which is following to the incorporation of Ni(II) to polymeric layer by immersion of modified electrode in 1.0 M nickel sulphate solution. The general electrochemical behavior was characterized by cyclic voltammetry and chronoamperometry methods in alkaline media. The results show that the (P(NA)-Ni /GCE system exhibits a significant electrocatalytic activity towards oxidation of formaldehyde. The effects of scan rate and formaldehyde concentration on the electrocatalytic oxidation of formaldehyde were also investigated at the surface of P(NA)-Ni/GCE. The diffusion coefficient (D= 2.85×10-4 cm2 s-1), and the transfer coefficient (α = 0.36) of formaldehyde were calculated. © 2013 by ESG.


Liu G.-H.,Guangxi Normal University | Liu G.-H.,Nanjing University of Science and Technology | Yang J.-Y.,Nanjing University of Science and Technology
Pattern Recognition | Year: 2013

This paper presents a novel image feature representation method, namely color difference histograms (CDH), for image retrieval. This method is entirely different from the existing histograms; most of the existing histogram techniques merely count the number or frequency of pixels. However, the unique characteristic of CDHs is that they count the perceptually uniform color difference between two points under different backgrounds with regard to colors and edge orientations in L*a*b* color space. This method pays more attention to color, edge orientation and perceptually uniform color differences, and encodes color, orientation and perceptually uniform color difference via feature representation in a similar manner to the human visual system. The method can be considered as a novel visual attribute descriptor combining edge orientation, color and perceptually uniform color difference, as well as taking the spatial layout into account without any image segmentation, learning processes or clustering implementation. Experimental results demonstrate that it is much more efficient than the existing image feature descriptors that were originally developed for content-based image retrieval, such as MPEG-7 edge histogram descriptors, color autocorrelograms and multi-texton histograms. It has a strong discriminative power using the color, texture and shape features while accounting for spatial layout. © 2012 Elsevier Ltd All rights reserved.


Zeng M.-H.,Guangxi Normal University | Yin Z.,Guangxi Normal University | Tan Y.-X.,Guangxi Normal University | Zhang W.-X.,Sun Yat Sen University | And 2 more authors.
Journal of the American Chemical Society | Year: 2014

We present the syntheses, structural characterization, gas sorption, I 2 uptake, and magnetic properties of a double-walled porous metal-organic framework, [CoII 3(lac)2(pybz) 2]·3DMF (1·3DMF, purple, where pybz = 4-pyridyl benzoate, lac = d- and l-lactate) and of its post-synthetic modified (PSM) congeners, [CoII 3(lac)2(pybz) 2]·xGuest (xGuest = 6MeOH, purple; 4.5EtOH, purple; 3PrOH, purple; 2C6H6, purple; 2.7I2, black), [Co II 3(lac)2(pybz)2] (1, purple), [CoII 3(pybz)2(lac)2(H 2O)2]·7H2O (1a·7H2O, green), and [CoIIICoII 2(pybz) 2(lac)2(H2O)2]I·2H 2O·1.5DMSO (1b·I-·2H 2O·1.5DMSO, yellow, DMSO = dimethyl sulfoxide). Crystallography shows that the framework is not altered by the replacement of DMF by different solvents or by the removal of the solvent molecules during the single-crystal to single-crystal (SC-SC) transformations, while upon exchange with H2O or partial oxidation by molecular iodine, the crystallinity is affected. 1 absorbs N2, H2, CH4, CH 3OH, C2H5OH, PrOH, C6H6, and I2, but once it is in contact with H2O the absorption efficiency is drastically reduced. Upon PSM, the magnetism is transformed from a canted antiferromagnet (1·3DMF and 1·xGuest) to single-chain magnet (1), to a ferrimagnet (1a·7H2O), and to a ferromagnet (1b·I-·2H2O·1.5DMSO). Raman spectroscopy suggests the color change (purple to green 1a·7H 2O or yellow 1b·I-·2H2O·1. 5DMSO) is associated with a change of geometry from a strained octahedron due to the very acute chelating angle (60°) of the lactate of a cobalt center to a regular octahedron with a monodentate carboxylate and one H2O. The magnetic transformation is explained by the different interchain exchanges (J'), antiferromagnetic for 1·3DMF and 1·xSolvent (J' < 0), SCM for 1 (J' verge to 0), and ferromagnetic for 1a·7H2O (J' > 0), between homometal topological ferrimagnetic chains (two octahedral and one tetrahedral CoII ions) connected by the double walls of pybz at 13.3 Å (shortest Co···Co). For 1b·I -·2H2O·1.5DMSO the moment of the tetrahedral site is turned off, thus stabilizing a ferromagnetic state (J' > 0). The present stabilization of four magnetic ground states is unique in the field of metal-organic frameworks as well as the electrical conductivity of 1·2.7I2. © 2014 American Chemical Society.

Discover hidden collaborations