Maoming, China
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An Z.,Maoming University | Gao J.,Heilongjiang University | Harrison W.T.A.,University of Aberdeen
Journal of Coordination Chemistry | Year: 2010

The syntheses and crystal structures of the closely related but non-isostructural Cd2(C19H21N3O 3F)4(H2O)24H2O (1) and Pb2(C19H21N3O3F) 4 4H2O (2) are described, where C19H 21N3O3 -is enrofloxacinate (enro). Both compounds contain centrosymmetric, binuclear, neutral complexes incorporating a central diamond-shaped M2O2 (M=Cd, Pb) structural unit. The Cd2+ coordination polyhedron in 1 is a CdO 6 trigonal prism, including one coordinated water. The Pb 2+ coordination polyhedron in 2 can be described as a very distorted square-based PbO5 pyramid, although two additional short Pb ⋯O (<53.1Å ) contacts are also present. In the crystal of the cadmium complex, O-H⋯O hydrogen bonds lead to a layered structure. In the lead compound, O-H ⋯ O and O-H ⋯ N interactions lead to chains in the crystal. Crystal data: 1: C76H96Cd2F 4N12O18, Mr=1766.45, triclinic, P.1, a=12.185(2)Å, b=12.306(3)Å, c=14.826(3)Å, α=68.15(3)°, β=70.28(3)°, γ =86.11(3)°, V=1938.2(7)Å 3, Z=1, T=298 K, R(F )=0.030, wR(F 2)=0.079. 2: C76H88F4N 12O16Pb2,Mr=1920.00, triclinic, P.1, a=12.0283(4)Å, b=12.7465(4)Å, c=13.0585(4)Å, .=83.751(1)°, β=74.635(1)°, ° =81.502(1)°, V=1904.3(1)Å 3, Z=1, T=298 K, R(F)=0.021, wR(F 2)=0.049. © 2010 Taylor & Francis.

Wang J.,Harbin Engineering University | Wang J.,Harbin Institute of Technology | Li D.,Harbin Engineering University | Yu X.,Maoming University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2010

A magnesium-aluminum layered double hydroxide (Mg-Al LDH) film was fabricated on a Mg alloy substrate by a hydrothermal crystallization method, based on an interface reaction between hydrotalcite slurry and Mg alloy. Magnesium-aluminum layered double hydroxide with carbonate intercalation was obtained by synthesis involving separate nucleation and aging steps, where the Mg-Al LDH film was formed in the aging process. The LDH film was uniform and compact. The film was characterized by XRD, SEM, EDS techniques to study the structure, phase purity and morphology, respectively. Polarization measurements and electrochemical impedance spectroscopy (EIS) showed that the LDH film could effectively protect Mg alloy from corrosion. The cross cutting showed that the adhesion between the film and the substrate was very strong which enhances its potential for practical application. © 2010 Elsevier B.V. All rights reserved.

Zhu W.-L.,Maoming University | He Y.-J.,Guangdong Polytechnic Normal University | He Y.-J.,Hong Kong Baptist University
Optics Express | Year: 2010

We analyze stability of moving dissipative solitons in the one-, two, and three-dimensional cubic-quintic complex Ginzburg-Landau equations in the presence of a linear potential (linear refractive index modulation). The expressions of stability conditions and propagation trajectory of solitons are derived by means of a generalized variational approximation. Predictions of the variational analysis are fully confirmed by direct numerical simulations. The results have potential applications to using spatial dissipative solitons in optics as individually addressable and shift registers of the all-optical data processing systems. © 2010 Optical Society of America.

Zhang Q.,Maoming University | Fu Y.,Maoming Vocational and Technical College
International Journal of Systems, Control and Communications | Year: 2011

In the last years, a lot of effort has been put into solving the intrusion detection problem. In this paper, we present an experimental framework for a Network Intrusion Detection System (NIDS) based on the immunological approach. In the data collection stage, we use the adaptive sampling algorithm, according to the dynamic characters of detection data, and intrude the sliding window into the model. Comparing with this model, data-processing capabilities and the fault tolerance of model have further improved. Expand the application of data streaming mining technologies. Copyright © 2011 Inderscience Enterprises Ltd.

Chen Y.,Zhejiang University | Zhao Y.,Zhejiang University | Gao H.,Maoming University | Zheng J.,Zhejiang University
Particuology | Year: 2011

Liquid bridge force acting between wet particles is an important property in particle characterization. This paper deals with liquid bridge force between either two unequal-sized spherical particles or a sphere and a flat plate under conditions where gravitational effect arising from bridge distortion is negligible. In order to calculate the force of the liquid bridge efficiently and accurately, expressions of liquid configuration and liquid bridge force were derived by building a mechanical model, which assumes the liquid bridge to be circular in shape between either two unequal-sized spheres or a sphere and a plane. To assess the accuracy of the numerical results of the calculated liquid bridge forces, they were compared to the published experimental data. © 2011 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. All rights reserved.

Nong L.,Maoming University | Xiao C.,Zhejiang University | Zhong Z.,South China University of Technology
Journal of Surfactants and Detergents | Year: 2011

A series of novel zwitterionic phosphobetaine (PPBT) surfactants were synthesized using long chain fatty alcohol, epichlorohydrin, dimethylamine and sodium dihydrogen phosphate as raw materials. The physicochemical properties of the phosphobetaine surfactants such as isoelectric point, foaming, surface tension, critical micelle concentration (CMC) and Krafft point were measured. Low CMC and surface tension values indicated the surface activities of the phosphobetaine surfactants were quite excellent. The CMC and surface tension values of PPBT/SDS mixed systems were determined. It was found both of CMC and surface tension values decreased compared with single surfactant system because of the association between dodecyl sulfate anions and cationic groups in phosphobetaine by electrostatic attraction. © AOCS 2011.

Zuo J.,Maoming University | Cui D.,Maoming University
Advanced Materials Research | Year: 2010

Most watermarking schemes in literatures are usually implemented by embedding a mark in a host media itself for intended purposes. The existing techniques for watermarking are confronted with the problems of perceptible quality degradation and the inherent conflict between imperceptibility and robustness, which introduced by the watermark embedding. In this paper, we propose a novel audio zero-watermarking scheme for content authentication. First the audio is divided to frame by fixed length and then low-frequent and high-frequent components are obtained by three-level lifting-based wavelet transformation in every frame. Secondly the audio frame is approximately represented as a product of a base matrix and a coefficient matrix using non-negative matrix factorization (NMF). Finally the sum of each column in the coefficient matrix is calculated which is quantized to produce a feature vector, and then the copyright information is obtained by calculating the watermark and feature vector. Experiment results show that the proposed scheme is robust against Mp3 compression and secure. © (2010) Trans Tech Publications, Switzerland.

An Z.,Maoming University | Zhu L.,Maoming University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The title compound, [Ni(C14H16N5O 3)2]n or [Ni(ppa)2]n, where ppa is 8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydro-pyrido[2,3-d]pyrimidine-6-carboxyl- ate, was synthesized under hydro-thermal conditions. The NiII atom (site symmetry ) exhibits a distorted trans-NiN2O4 octa-hedral geometry defined by two monodentate N-bonded and two bidentate O,O'-bonded ppa monoanions. The extended two-dimensional structure is a square grid. An inter-molecular N - H⋯O hydrogen bond occurs.

Zhang J.,Maoming University
2010 International Conference on Machine Vision and Human-Machine Interface, MVHI 2010 | Year: 2010

A scheme of low-power and high slew-rate voltage follower for CSTN-LCD Applications was presented in the paper. Auxiliary modules circuit was adopted in order to meet the demands of low-power and high slew-rate simultaneously. Moreover, cascode frequency compensation was used to obtain better frequency response properties and improve the PSRR+/- of the circuit. In addition, floating current source providing bias current for output stage was introduced to realize a compact circuit structure. Simulation analysis and tape-out verification indicate that static power cost of the whole circuit is 35uA in typical corner. And the time of charge/discharge on the pixel-load is less than 15us. © 2010 IEEE.

Cui D.,Maoming University
2010 International Conference on Machine Vision and Human-Machine Interface, MVHI 2010 | Year: 2010

To enhance present fingerprint encryption/decryption algorithm security, a novel fingerprint encryption/decryption algorithm based on chaotic system and fractional Fourier transform is proposed in this paper. The fingerprint encryption process includes two steps: first the fingerprint is encrypted by employing Fractional Fourier domain double random phase, then the confusion fingerprint is encrypted by using confusion matrix which is generated by chaotic system, and finally the cipher fingerprint is obtained. The security of the proposed algorithm depends on the sensitivity to the randomness of phase mask, the orders of FRFT and the initial conditions of chaotic system. Theoretical analysis and experimental results demonstrate that the algorithm is favorable. © 2010 IEEE.

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