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Ouyang W.,Bozhou Teachers College | Sun J.,Shandong Academy of Sciences | Sun J.,University of Jinan
Materials Letters | Year: 2016

Biosynthesis of near-infrared (NIR) fluorescent silver sulfide quantum dots (Ag2S QDs) in wheat endosperm cells is reported in this paper. By delivering QD precursors into cultured wheat endosperm cells, Ag2S QDs were successfully synthesized in an aging process under the effect of endogenous glutathione in the cells. The structure and optical properties of the biocompatible Ag2S QDs were characterized. These intracellularly synthesized NIR QDs exhibited a quantum yield qualified for bio-imaging and were highly photostable. © 2015 Published by Elsevier B.V.

Wang W.-J.,Bozhou Teachers College | Wang H.-L.,Linhai Food and Drugs Inspection Center | Bi J.-H.,Hefei Normal University
Asian Journal of Chemistry | Year: 2015

A new Pb(II) complex of formula [Pb(PTBA)2H2O] (PTBA = p-tert-butyl benzoic acid) has been synthesized and the crystal structure was characterized by single crystal X-ray diffraction. The complex crystallizes in the system and belongs to space group: triclinic, P-1 with a = 6.6964(7)Å, b = 12.5782(12)Å, c = 13.9056(14)Å, α = 91.8640(10)°, β = 101.141(2)°, γ = 97.5670(10)°, V = 1137.1(2)Å3, Z = 2, Dc = 1.693 Mg/cm3, Mr = 579.63, μ(moKo) = 7.445 mm-1, F(000) = 564. R = 0.0282 and wR = 0.0575 for 3943 observed reflections with I >σ(I). The crystal structure analysis indicates that the Pb(II) ion is five-coordinated by two PTBA ligand molecules and one water molecule. © 2015, Chemical Publishing Co. All rights reserved.

Qin C.Y.,Bozhou Teachers College | Zhang L.,Bozhou Teachers College | Qiu D.,Huaibei Normal University | Huang L.,Bozhou Teachers College | And 4 more authors.
Knowledge-Based Systems | Year: 2015

Q-matrix is the intermediary between attribute mastery patterns and responses in cognitive diagnostic assessment; therefore, Q-matrix plays a very important role in the assessment. Currently, lacking of reliable method of inferring and validating the expert-specified Q-matrix is the main problem. Based on the algorithm of Liu et al. (2012), three modified algorithms are proposed. There are two major differences between the algorithm of Liu et al. and the modified algorithms, one is to modify the item parameters from fixed to unfixed, the other is to use an "incremental" Q-matrix estimation, which some items named as "base items" have been correctly prespecified, others (or called as new items or raw items whose attributes have not been specified) need to be specified. The modified algorithms "incrementally" add new items to the "base items" one by one, estimate the item parameters and Q-matrix jointly, rather than estimate all of the items simultaneously which would bring more "noise" to affect the accuracy of estimation. Simulation studies showed that the modified algorithms could get satisfactory results, and the empirical study showed that the proposed algorithms could offer useful information about the Q-matrix specification. © 2015 Elsevier B.V.

Yu X.,BoZhou Teachers College | Ding S.,Jiangxi Normal University
2nd International Conference on Information Science and Engineering, ICISE2010 - Proceedings | Year: 2010

Classification is a basic task in data analysis and pattern recognition that requires the construction of a classifier, that is, a function that assigns a class label to instances described by a set of attributes. Naive Bayesian Networks Classifier is one of the Bayesian Classifiers. Due to its simple structure and powerful reasoning ability in solving nondeterminant problems, Naive Bayesian Network Classifiers is attracting more and more attention of the researchers Naive Bayesian Network Classifiers is applied to the classification of cognitive diagnosis in modern education measurement and some simulation experiments were done to test dichotomous. The method of how to construct a 1Naive Bayesian Networks Classifier which is used to cognitive diagnosis is introduced. Four kinds of attribute hierarchies were separately used as the basis for the simulation. For each of the four attribute hierarchies, a sample of 5000 expected item response vectors was generated to approximate a normal distribution. Given that samples only consist of expected response patterns which are free from slips, the observed item response patterns were generated by randomly adding slips to each of the expected response patterns. In this study, the percentage of random errors was manipulated to 5%,10% and 15% of the total number of item response to examine whether the number of random errors has an impact on the accuracy of classification methods. Compared with the typical classification method of cognitive diagnosis under the same conditions, Naive Bayesian Classifier has an obvious advantage. © 2010 IEEE.

Yang M.,Bozhou Teachers College | Wang Z.G.,Anhui University of Science and Technology | Zhou J.Z.,Bozhou Teachers College
Applied Mechanics and Materials | Year: 2014

A broadband radar cross section (RCS) calculation approach is proposed based on the asymptotic waveform evaluation (AWE) technique. The equivalent dipole moment method (EDMM) is used to accelerate the process of filling the impedance matrix and more derivative matrices. So the broadband RCS is achieved quickly by using AWE technique and EDMM. Numerical results show that the computational efficiency is improved significantly by using the method presented in this paper with ensuring the accuracy. © (2014) Trans Tech Publications, Switzerland.

Yang M.,Bozhou Teachers College | Wang Z.G.,Anhui University of Science and Technology | Zhang L.,Bozhou Teachers College
Advanced Materials Research | Year: 2014

If the nodes in a multi-media data transmission system can not meet low power in traditional wireless sensor networks (WSNs), it will greatly reduce the network life cycle. On the basis of quantized compressive sensing (QCS), this paper presents a communication model which can analyze the impact of uniform quantization coding and Hoffman coding on image's transmission and reconstruction. According to the prior probability of image measurement, this paper proposes a novel scheme for non-uniform quantizer.The simulation results show that the multi-media data transmission system can obtain images effectively and reduce the distortion by using the proposed scheme. © (2014) Trans Tech Publications, Switzerland.

Wu C.,China University of Mining and Technology | Wu C.,Xuzhou Mining Group Corporation | Zhuang Q.-C.,China University of Mining and Technology | Tian L.-L.,China University of Mining and Technology | And 5 more authors.
RSC Advances | Year: 2015

In the present work, α-Fe2O3 hollow structures from nanotubes to nanorings, and α-Fe2O3/carbon composites composed of nanoparticles homogeneously dispersed on graphene sheets and carbon nanotubes were synthesized via self-assembly combined with a facile hydrothermal method, and their structure, morphology and electrochemical performance were characterized by XRD, XPS, SEM, TEM, CV, charge-discharge tests and EIS. The focus is elucidating how structural aspects, such as particle size and shape of the nanoparticles as well as the carbon matrix, influence the electrochemical properties of the α-Fe2O3 nanoparticles. The results revealed that the cycling performance of hollow structured α-Fe2O3 improves with the increase of aspect ratio, namely, the α-Fe2O3 nanotubes exhibit the best electrochemical performance in terms of reversible capacity, capacity retention and rate performance, which is comparable to that of α-Fe2O3 nanoparticle-carbon composites. It is expected that the synthesis of α-Fe2O3 nanotubes with high aspect ratio anchored on conducting graphene would be a potential anode material for high performance LIBs. © 2015 The Royal Society of Chemistry.

Li T.,Bozhou Teachers College | Xia Y.,Bozhou Teachers College
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2014

A new type of reduced graphene oxide-CuInS2(rGO-CuInS2) composite was successfully synthesized via solvothermal method. The structure of composite was characterized by X-ray diffraction (XRD), Raman, UV-Vis (UV-Vis), photoluminescence (PL) spectra, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy(HRTEM). The results show that CuInS2 quantum dots, with a size of 3-5 nm, disperses uniformly on the surface of graphene. In addition, the growth mechanism of the composite was also investigated. And the rGO-CuInS2 composites with different rGO/CuInS2 mass ratio were applied in hybrid photovoltaic device. Compared with the power conversion efficiency (θ) of the device based on reduced graphene oxide (rGO), the device based on rGO-CuInS2 composites exhibit higher performance with the highest θof 1.10% when the composite mass ratio is 0.5:1.

Hao J.,Bozhou Teachers College | Liang Z.,Bozhou Teachers College
BioTechnology: An Indian Journal | Year: 2014

In terms of network operating QoS analysis, we propose a cascading network QoS analyzing algorithm based on K-means and C4.5 algorithm. The algorithm was testified to be suitable for multiple analyze requirements. Also based on the monitoring data captured from the real Internet, the algorithm was proved to be effective and efficient The algorithm processes the data captured from the project "User-oriented Active 4G Network Measurement System. The system is deployed at multiple wireless network accessing points; conducting 4G network QoS monitoring 24 hours. The paper covers experiments to find a proper K and C4.5 discrete value, and use the KKZ algorithm to initialize the cluster center values. Based on the six traces of monitoring data, we compared the performances of cascading network QoS analyzing algorithm, K-mean algorithm and C4.5 algorithm. As a result, the cascading algorithm was highly efficient and reduces the noise of single algorithm; also it proved to be suitable to several types of monitoring data. © Trade Science Inc.

Tan D.,HIGH-TECH | Tan D.,CAS Guangzhou Institute of Geochemistry | Zhou W.,CAS Guangzhou Institute of Geochemistry | Ouyang W.,Bozhou Teachers College | And 5 more authors.
CrystEngComm | Year: 2014

Nanocrystalline magnesium aluminate was synthesized with the coprecipitation method. Its growing behaviors as a function of temperature were studied with synchrotron X-ray diffraction (XRD) and Raman spectroscopy. It is found that the particle growth was greatly inhibited at temperatures below 1000°C due to the hydroxide precursor reactants. Above 1000°C, magnesium aluminate nanoparticles start to grow fast. After two hours annealing at 1200°C, the grain size changes by multiple folds, suggesting that oriented attachment may occur. Above 1200 °C, the grain size changes in various directions are much smaller than the average grain size, indicating the oriented attachment mechanisms become inactive in the growth of MgAl2O 4 nanoparticles with sizes larger than 42 nm. © 2014 The Royal Society of Chemistry.

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