Xu X.-J.,Nanjing University of Aeronautics and Astronautics |
Xu X.-J.,Huainan Normal College |
Wang Y.-R.,Nanjing University of Aeronautics and Astronautics
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2014
The fractional wavelet transform extend the analysis method of wavelet transform about time-frequency domain to time-fractional frequency domain, can characterize signal features in time and fractional-frequency domain. Based on the theory of multiresolution analysis(MRA) of the fractional wavelet, the new forms about coefficient decomposition and reconstruction of discrete fractional wavelet transform(DFRWT) are given and made two-dimensional expansion. According to the feature of subband coefficient energy of image based on DFRWT varies with different p order, a novel image threshold denoising method based on DFRWT is proposed. The method in conditions of keeping the energy of low frequency subband for absolute great value, appropriate to raise the distribution of energy percentage, more beneficial for image noise suppression. The experimental results show that the performance of this method is better than the traditional wavelet threshold denoising method both in vision effect and peak signal to noise ratio.
Yong G.-P.,Hefei University of Technology |
Tian D.,Hefei University of Technology |
Tian D.,Huainan Normal College |
Tong H.-W.,Hefei University of Technology |
Liu S.-M.,Hefei University of Technology
Journal of Molecular Catalysis A: Chemical | Year: 2010
The mesoporous SBA-15 supported silver nanoparticles catalyst system with a highly ordered hexagonal mesostructure was prepared by an in situ reduction method using hexamethylenetetramine as mild and efficient reducing agent. These AgSBA-15 materials act as environmentally friendly catalysts in A3-coupling reactions of aldehydes, amines, and terminal alkynes with glycol as a "green" solvent. It is also found that the maximum reaction yield has been obtained for an average Ag-nanoparticle size of about 8 nm. The catalyst could also be recovered easily and used repetitively four times without significantly affecting the catalytic activity. The heterogeneous catalysts were fully characterized by N2 adsorption and desorption, XRD, TEM, ICP and XPS. © 2010 Elsevier B.V. All rights reserved.
Ruan Y.,Huainan Normal College
Advance Journal of Food Science and Technology | Year: 2015
Food safety is the goal of service-oriented government, which is to achieve one of the main functions. Food safety is not only a political issue related to national security and social stability, but also an economic problem. This study makes the general theories analysis for the food safety to the athletes by describing the various factors affecting food security and builds interpretive structural model to analyze the relationship between various factors. Meanwhile, it is to identify measures to address food safety issues. © Maxwell Scientific Organization, 2015.
Li L.,Huainan Normal College
Journal of Sol-Gel Science and Technology | Year: 2011
Uniform spinel ferrite CoFe2O4 nanoparticles with average diameter of 40 nm were fabricated by a novel glycol-assisted autocombustion method. The as-prepared powders were characterized by X-ray diffraction, transmission electron microscopy and Raman spectrum. The room temperature magnetic property of the nanoparticles was examined, indicating the presence of an ordered magnetic structure in the spinel system. The electrochemical tests show that the as-prepared nanoparticles exhibits excellent electrochemical cycleability. The simple synthetic route can be applied to as a general method for the fabrication of other functional nanomaterials. © 2011 Springer Science+Business Media, LLC.
Tian D.,Huainan Normal College |
Tian D.,Lakeland College
Advanced Materials Research | Year: 2012
Mesoporous silicas SBA-15 with Ag nanoparticles in the channel was synthesized by one-step method. Samples characterzation were performed by the XRD, TEM, adsorption/desorption of nitrogen and ICP-AES. And the heterogeneous catalysis(Ag/SBA-15) shows catalytic activity in three-component coupling reaction of aldehyde, alkyne, and amine. © (2012) Trans Tech Publications, Switzerland.