Wenshan City, China

Wenshan University

Wenshan City, China
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Zhou P.,Wenshan University
Agro Food Industry Hi-Tech | Year: 2017

How to effectively detect and infer network performance has become one of the most important and difficult points in this field. This paper conducts a research on the network performance inference algorithm, explores the network performance inference indicators and figures out the inherent problems in the existing indicators. Aimed at the problems, a network performance inference algorithm based on mathematical programming is proposed and the experimental contrast method is adopted to study the practical effect of the algorithm. The network structures are divided into largescale and small-scale ones, which are used to carry out the experimental research on the network performance inference method based on mathematical programming. Also it is compared with the traditional algorithm and the Quest algorithm respectively in terms of correctness, superiority, time consumption and other properties. The experimental results show that the algorithm has a certain practical significance.

Hu J.-G.,Wenshan University | Shen T.,Wenshan University
Solid State Communications | Year: 2016

The hexagonal and tetragonal ordered arrays were prepared by Ni/Cu superlattice nanowires on the porous anodic alumina membrane template, and their phonon band structures were calculated by using the plane wave expansion method. Numerical results show that the hypersonic band gaps can be acquired by adjusting the structural parameters. Along the different wave-vector directions, the width and position of band gap would vary. If the nanowires'filling fraction is increased continuously, the width of the first band gap firstly increases and then decreases within a certain range. The height of superlattice nanowire elementary unit can only affect the width of band gap within a quite narrow range. When the height of elementary unit remains unchanged, the decrease of the Cu-component ratio can contribute to the formation of a wider band gap. Additionally, the wide band gap is more easily formed in tetragonal structure than in hexagonal structure. © 2016 Elsevier Ltd. All rights reserved.

Kao S.-P.,National Chung Hsing University | Chen Y.-C.,National Chung Hsing University | Ning F.-S.,Wenshan University
Advances in Space Research | Year: 2014

The geometry-free linear combination of dual-frequency GNSS reference station ground observations are currently used to build the Vertical Total Electron Content (VTEC) model of the ionosphere. As it is known, besides ionospheric delays, there are differential code bias (DCB) of satellite (SDCB) and receiver (RDCB) in the geometry-free observation equation. The SDCB can be obtained using the International GNSS Service (IGS) analysis centers, but the RDCB for regional and local network receivers are not provided. Therefore, estimating the RDCB and VTEC model accurately and simultaneously is a critical factor investigated by researchers. This study uses Multivariate Adaptive Regression Splines (MARS) to estimate the VTEC approximate model and then substitutes this model in the observation equation to form the normal equation. The least squares method is used to solve the RDCB and VTEC model together. The research findings show that this method has good modeling effectiveness and the estimated RDCB has good reliability. The estimated VTEC model applied to GPS single-frequency precise point positioning has better positioning accuracy in comparison to the IGS global ionosphere map (GIM). © 2013 COSPAR. Published by Elsevier Ltd. All rights reserved.

Ou Y.-L.,Texas A&M University-Commerce | Wang Z.-P.,Wenshan University
Journal of Geometry and Physics | Year: 2011

We prove that a totally umbilical biharmonic surface in any 3-dimensional Riemannian manifold has constant mean curvature. We use this to show that a totally umbilical surface in Thurston's 3-dimensional geometries is proper biharmonic if and only if it is a part of S2(1/2) in S3. We also give complete classifications of constant mean curvature proper biharmonic surfaces in Thurston's 3-dimensional geometries and in 3-dimensional Bianchi-Cartan-Vranceanu spaces, and a complete classification of proper biharmonic Hopf cylinders in 3-dimensional Bianchi-Cartan-Vranceanu spaces. © 2011 Elsevier B.V.

Hu J.-G.,Wenshan University | Hu J.-G.,Yunnan University | Xu W.,Yunnan University
Physica B: Condensed Matter | Year: 2014

With a square lattice mercury and water system being as the model, the band structures of nesting and compound phononic crystals with two different lattice constants were investigated using the method of the supercell plane wave expansion. It was observed that large band gaps can be achieved in low frequency regions by adjusting one of the lattice constants. Meanwhile, effects similar to interstitial impurity defects can be achieved with the increase of lattice constant of the phononic crystal. The corresponding defect modes can be stimulated in band gaps. The larger the lattice constant, the stronger the localization effect of defect modes on the wave. In addition, the change of the filling fraction of impurity exerts great influence on the frequency and localization of defect modes. Furthermore, the change of the position of impurity has notable influence on the frequency of defect modes and their localization. However, the geometry structure and orientation of impurity have little effect on the frequency of defect modes and their localization in the band gap. © 2014 Elsevier B.V. All rights reserved.

Shen Q.-Q.,Wenshan University | Wang L.,Central South University
Mitochondrial DNA | Year: 2016

The complete mitochondrial genome of the Tiger Longwing Heliconius hecale has been reconstructed from whole-genome Illumina sequencing data with an average coverage of 1507×. The circular genome is 15,338 bp in length, consisting of 13 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), 2 ribosomal RNAs (rRNAs) and 1 D-loop or control region. All PCGs initiated with ATN codons, except for the COI and ND1 genes with CGA and TTG as their start codons, respectively. Three PCGs (COI, COII and ND4) have an incomplete stop codon T, the ND3 gene harbors the stop codon TAG, while all the other PCGs terminated with the TAA codon. The nucleotide composition is highly asymmetric (39.5% A, 42.1% T, 7.5% G, and 10.9% C) with an overall GC content of 18.4%. © 2014 Informa UK Ltd.

Wang C.,Kunming University of Science and Technology | Dai Z.,Yunnan University | Liu C.,Wenshan University
Physica Scripta | Year: 2014

In this paper, two types of multi-parameter breather homoclinic wave solutions - including breather homoclinic wave and rational homoclinic wave solutions - are obtained by using the Hirota technique and ansätz with complexity of parameter for the coupled Schrödinger-Boussinesq equation. Rogue waves in the form of the rational homoclinic solution are derived when the periods of breather homoclinic wave go to infinite. Some novel features of homoclinic wave solutions are discussed and presented. In contrast to the normal bright rogue wave structure, a structure like a four-petaled flower in temporal-spatial distribution is exhibited. Further with the change of the wave number of the plane wave, the bright and dark rogue wave structures may change into each other. The bright rogue wave structure results from the full merger of two nearby peaks, and the dark rogue wave structure results from the full merger of two nearby holes. The dark rogue wave for the uncoupled Boussinesq equation is finally obtained. Its structural properties show that it never takes on bright rogue wave features with the change of parameter. It is hoped that these results might provide us with useful information on the dynamics of the relevant fields in physics. © 2014 The Royal Swedish Academy of Sciences.

Yang M.,Nanjing Southeast University | Huang Q.,Nanjing Southeast University | Jin X.,Wenshan University
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2012

ZnGaNO solid solution-C 3N 4 composite photocatalyst with visible light response was synthesized through polymerization of melamine in the presence of ZnGaNO solid solution. The composite photocatalyst was characterized by X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FT-IR) spectroscopy, UV-vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy (XPS), Energy dispersed spectrometer (EDS) and BET surface area measurements. The activity of composite photocatalyst g-C 3N 4-ZnGaNO for photodegradation of methyl orange (MO) is higher than that of either single-phase g-C 3N 4 or ZnGaNO solid solution. The as-prepared composite photocatalyst exhibits an improved photocatalytic activity due to enhancement of electron-hole separations at the interface. © 2012 Elsevier B.V. All rights reserved.

Yang M.,Nanjing Southeast University | Jin X.,Wenshan University | Huang Q.,Nanjing Southeast University
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2011

Vaterite core-shell microspheres composed of core-nanoparticles and shell-hexagonal nanoplates are synthesized by precipitation route assisted by poly(styrene sulfonic acid) sodium salt (PSS). The as-prepared products are characterized by XRD and SEM. With the addition of PSS, the crystal phase of calcium carbonate is transferred from calcite to vaterite. The growth process of vaterite microspheres is investigated by SEM. It is supposed that the core-shell structured microspheres with the nanoparticles in core and the hexagonal plates at the outer layer are attributed to the adsorption of PSS, ammonia and the re-crystallization of the nanoparticles. © 2010 Elsevier B.V.

Yang M.,Nanjing Southeast University | Huang Q.,Nanjing Southeast University | Jin X.,Wenshan University
Solid State Sciences | Year: 2012

Porous ZnGaNO solid solution has been synthesized through a facile microwave route. The product was characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscopy (HRTEM) and UV-vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy (XPS), Energy dispersed spectrometer (EDS) and N 2-sorption. The growth process of porous ZnGaNO solid solution is investigated by XRD and SEM. The porous structure is supposed to be attributed to the release of the gaseous side products and the structural contraction through a pseudo-topological transformation. The activity of porous ZnGaNO photocatalyst for photodegradation of isopropyl alcohol (IPA) is much higher than that of ZnGaNO solid solution prepared by a solid state reaction. The as-prepared porous ZnGaNO photocatalyst exhibits an improved photocatalytic activity due to the strong gas adsorption by the porous structure and the enhancement of extended light absorption by the higher Zn content. © 2012 Elsevier Masson SAS. All rights reserved.

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