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Zheng D.,Nanjing University | Zheng D.,Lianyungang Teachers College | Zhu X.,Shanghai University | Zhu X.,Nanjing University | And 5 more authors.
Analyst | Year: 2013

Oxytetracycline (OTC), a broad-spectrum antibiotic, has been extensively used as a food additive for livestock. Its extensive use has greatly increased the risk of chronic drug abuse and has also increased the risk of the resulting diseases. Therefore, in light of this emerging situation, the detection of OTC in both food and livestock is very important to reduce the risks and for diagnosis purposes. In this work, we have proposed an electrochemical aptasensor to quantify OTC. The biosensor shows considerable sensitivity and selectivity, and it can be easily operated and regenerated. Furthermore, for the first time, we have shown that an electrochemical aptasensor can be directly used to detect OTC in mouse blood serum and urine. This biosensor has the potential to aid in the analysis of residual OTC levels, as well as providing more pharmacokinetic information in the future. This journal is © The Royal Society of Chemistry.

Tang P.,Nanjing University | Tang P.,Lianyungang Teachers College | Zhang Y.,Nanjing University | Sun X.,CAS Institute of Botany | And 3 more authors.
Plant Science | Year: 2010

Receptor-like kinase (RLK) genes may be a potential reservoir for plant disease resistance (R) genes as defense response has been proved to be a main category of their biological functions. Although genome-wide identification of RLKs has been accomplished in various plant species, little was done to distinguish the genes related to plant disease resistance. To discover more R gene candidates in plants, we explored all the leucine-rich repeat (LRR) RLKs in four fully sequenced genomes, Arabidopsis thaliana, rice, poplar and grapevine. Phylogenetic analysis showed that LRR-RLKs in these four species could be mainly divided into two opposite groups: lineage-specific Expanded vs. ortholog-unambiguous Nonexpanded. About 39.2% of the total LRR-RLKs residing in 16 major clades belonged to the Expanded group, exhibiting similar characteristics with respect to typical functional R genes. A high proportion (72%) of these genes was located in tandem duplications, indicating that lineage-independent expansion played an essential role in their evolution. Contrarily, genes in the Nonexpanded group tended to function in plant growth and development and basal defense responses. Positive selection driven by highly variable pathogen effectors and gene expansion should be two major factors making the differences between the two groups of LRR-RLKs. © 2010 Elsevier Ireland Ltd.

Shi L.,Huaihai Institute of Technology | Zhou Z.,Huaihai Institute of Technology | Tang B.,Lianyungang Teachers College
Applied Optics | Year: 2012

We demonstrate the optimization of plasmonic thin-film solar cells with broadband absorption enhancements. The solar cells model system consists of a three-dimensional, periodic array of Ag/silica cylinders on a Si film supported by a silica substrate. Particle swarm optimization (PSO) and the finite-difference time domain (FDTD) are combined to achieve the maximum absorption enhancement (Ehm). Through optimization, the optimal system parameters, such as the height and diameter of Ag and the silica cylinder, and the period of periodic array, were obtained. Following this approach, we can attain a 321% enhancement in the integrated quantum efficiency as compared to a cell without metallic structures. The full-band absorption enhancement arises from the near-field enhancement and multiresonant guided modes in the Si waveguide. © 2012 Optical Society of America.

Yan M.,Lianyungang Teachers College
Journal of Computers (Finland) | Year: 2013

Classification of nonlinear high-dimensional data is usually not amenable to standard pattern recognition techniques because of an underlying nonlinear small sample size conditions. To address the problem, a novel kernel fuzzy dual discriminant analysis learning based on a rank symmetric relation is developed in this paper. First, dual subspaces with rank symmetric relation on the discriminant analysis are established, by which a set of integrated subspaces of within-class and between-class scatter matrices are constructed, respectively. Second, a reformative fuzzy LDA algorithm is proposed to achieve the distribution information of each sample represented with fuzzy membership degree, which is incorporated into the redefinition of the scatter matrices. Third, considering the fact that the kernel Fisher discriminant is effective to extract nonlinear discriminative information of the input feature space by using kernel trick, a kernel algorithm based on the new discriminant analysis is presented subsequently, which has the potential to outperform the traditional subspace learning algorithms, especially in the cases of nonlinear small sample sizes. Experimental results conducted on the ORL and Yale face database demonstrate the effectiveness of the proposed method. © 2013 ACADEMY PUBLISHER.

Wang P.,Nanjing Normal University | Wang P.,Lianyungang Teachers College | Zhang Z.,Nanjing Normal University
International Journal of Computer Mathematics | Year: 2010

In this article, we use the quadratic finite volume element method (FVEM) to solve the problem of the air pollution model, choose the trial function spaces as the Lagrange quadratic element function spaces and the test function spaces as the piecewise constant function spaces, then get the error estimates of L2 and H1. Finally, by numerical experiments, we analyse and compare the FVEM with the finite difference method, and the numerical results we get show that the FVEM is much better and more effective, so this article has some practical significance in the improvement and control of air pollution. © 2010 Taylor & Francis.

Shi L.,Huaihai Institute of Technology | Zhou Z.,Huaihai Institute of Technology | Tang B.,Lianyungang Teachers College
Optik | Year: 2014

We present a numerical study on the optimization of plasmonic thin-film solar cells with full band optical absorption increased in all polarization using plasmonic backcontact gratings. Particle swarm optimization (PSO) and the finite-difference time domain (FDTD) are combined to achieve the maximum absorption enhancement. Through optimization, we obtained approximately a 288% average absorption enhancement, 304% and 273% absorption enhancement for TE- and TM-polarized illumination as compared to a bare cell. The corresponding optimal design parameters of plasmonic solar cell are P = 442 nm, h4 = 283 nm, h5 = 191 nm and w=238 nm. The full band absorption enhancement arises from the waveguide-plasmon-polariton, Fabry-Pérot (FP) cavity mode and multiresonant guided modes. The average absorption enhancement under an unpolarized illumination is almost immune to the incident angle ranging from -40 to 40. If the thickness of the light absorbing layer is increased, the absorption enhancement could be reduced significantly. And the average absorption enhancement is maximum (2.88) when the thickness of Si layer is 100 nm. © 2013 Elsevier GmbH.

Tang B.,Lianyungang Teachers College | Tang X.,Nankai University | Wang G.,Jiangsu University
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2011

Details on alternately layered composite cycle structure of two-dimensional photonic crystal, which was formed by the cylinder body thickness and dielectric constant difference, were discussed in the essay. Its transmission characteristics were studied numerically by using the plane wave expansion method. The numerical results indicate that in the layered complex period photonic crystal transmission spectra with different two-dimensional cylindrical radius, the band gap position, width and conduction mode appearance associates with the differences of spacer columns thickness. The greater the difference is, the smaller the photonic band gap is, and the central frequency location moves to lower dielectric constant layer. Also, in different complex periodic structure, the greater the dielectric constant difference is, the smaller the photonic band gap width is. Likely, the center frequency moves to lower frequency. When the spacer column layer reaches a certain value, no conduction mode will exist. Under the same difference conditions, forbidden band not only associates with conduction mode, but also with the lattice structure type and the display order of electromagnetic wave incident surface column. The related conclusions can be applied to the expansion of two-dimensional photonic crystal applications as a new theoretical basis.

Ding H.,Lianyungang Teachers College | Ding H.,Nanjing University of Science and Technology | Dai L.,Lianyungang Teachers College | Yan C.,Xuzhou Normal University
Chinese Optics Letters | Year: 2010

We exhibit a three-dimensional (3D) photonic nanojet based on a dielectric microsphere irradiated by a plane wave with the finite-difference time-domain (FDTD) method. We investigate the influence of the refractive index of the surrounding on the properties of the nanojet by simulating the electric field distributions in it. The simulation results show that, by optimally choosing the size of the sphere and the ratio of the refractive indices of the sphere and the surrounding, the focus point can occur just on the surface of the sphere even if the refractive index of the surrounding is changed. Additionally, the peak amplitude of the nanojet increases with increasing the refractive index of the surrounding. However, the decay length and the jet width of the nanojet decrease simultaneously. These effects may have potential applications in observation or manipulation of nano-objects such as antibodies in biology. In nanojet-enabled optical data storage, the photonic nanojet may be also helpful for improving data-storage capacities and retrieval speed by controlling the field amplitude, the decay length, and jet width of the nanojet. © 2010 Chinese Optics Letters.

Yan M.,Lianyungang Teachers College
Journal of Software | Year: 2013

Applications that use sparse representation are many and include compression, regularization in inverse problems, feature extraction, and more. Recent activity in this field has concentrated mainly on the study of pursuit algorithms that decompose signals with respect to a given dictionary. The K-SVD algorithm is an iterative method that alternates between sparse coding of the examples based on the current dictionary and a process of updating the dictionary atoms to better fit the data. However, the existing K-SVD algorithm is employed to a single feature space meaning that the pursuit algorithms are assigned to the given subspace definitely. The work proposed in this paper provides a novel adaptive way to adapting dictionaries in order to achieve the dual subspace sparse signal representations, the update of the dictionary is combined with a rank symmetrical relationship of the proposed dual subspace by incorporated a new mechanism of matrix transform, which is called dual K-SVD. Experimental results conducted on the ORL and Yale face databases demonstrate the effectiveness of the proposed method. © 2013 ACADEMY PUBLISHER.

Ding H.-X.,Nanjing University of Science and Technology | Ding H.-X.,Lianyungang Teachers College | Shen Z.-H.,Nanjing University of Science and Technology | Ni X.-W.,Nanjing University of Science and Technology | Zhu X.-F.,Huazhong University of Science and Technology
Applied Physics Letters | Year: 2012

The authors have demonstrated the multi-splitting and self-similarity of the band gap structures in quasi-periodic plates of Cantor series. The splitting peaks give the regularity of tri-branching. A semi-quantitative explanation is proposed in which the inherent cavity-like structure is proven to play the essential role in the phenomena of multi-splitting and self-similarity, which gives a reliable way to predict where and how the band gap is splitting in the quasi-periodic systems. Possible applications are discussed. © 2012 American Institute of Physics.

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