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Bozhou, China

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

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. Source

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

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. Source

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.

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. Source

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

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. Source

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

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. Source

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