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Liu H.,China University of Science and Technology | Yang L.,China University of Science and Technology | Zhang Z.,China University of Science and Technology | Pan K.,China University of Science and Technology | And 4 more authors.
Ceramics International | Year: 2016

Negative thermal expansion Sc2W3O12 thin films have been grown on silicon and quartz substrates by pulsed laser deposition (PLD). The effects of oxygen pressure, substrate temperature and annealing temperature on the morphologies and phase composition of the Sc2W3O12 thin films were systematically investigated using X-ray diffraction (XRD), atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The negative thermal expansion, optical and nanomechanical properties of the Sc2W3O12 thin films were characterized by high temperature X-ray diffraction, spectrophotometry and nanoindentation. The results indicate as-deposited Sc2W3O12 thin films to be amorphous. Orthorhombic Sc2W3O12 thin films were observed to form by heating at 1000°C for 7min in air. The Sc2W3O12 thin film deposited at 500°C under an oxygen pressure of 20Pa has the lowest root mean square (RMS) roughness value. Meanwhile it also shows the optimum optical performance with an average transmission of over 85%. The Young's modulus (E) of the Sc2W3O12 thin film is 153.40GPa and the hardness (H) is 8.62GPa. The orthorhombic Sc2W3O12 thin film exhibits an anisotropic negative thermal expansion with an average linear thermal expansion coefficient was calculated to be -3.0×10-6 K-1 in the temperature range from 25°C to 600°C. © 2016 Elsevier Ltd and Techna Group S.r.l.


Gu M.,Yang Zhou University
Bing du xue bao = Chinese journal of virology / [bian ji, Bing du xue bao bian ji wei yuan hui] | Year: 2010

Abstract:One H5N1 subtype avian influenza virus, A/duck/Shandong/009/2008 (Dk/SD/009/08), was isolated from apparently healthy domestic ducks in some live bird market in East China during our epidemiological surveillance. To investigate the genetic composition, Dk/SD/009/08 was subjected to genome sequencing. The amino acid motif of cleavage site was "PLRERRRK-R/GL", which was consistent with the characterization of the HPAIV. According to the newest unified nomenclature system of H5N1, Dk/SD/ 009/08 was classified into Clade 2.3.4. The BLAST results showed that four gene segments (HA, NA, NP and NS) had the highest nucleotide identities with H5N1 subtype AIVs whereas the remaining four (PB2, PB1, PA and M) displayed the closest relationship with H9N2 subtype. Therefore, Dk/SD/009/08 might be a natural reassortant virus. The phylogenetic analysis further indicated that G1-like H9N2 subtype AIVs which was prevalent mainly in quails of Southern China might provide the internal genes for Dk/ SD/009/08.


Liu H.,China University of Science and Technology | Zhang Z.,Yang Zhou University | Ma J.,China University of Science and Technology | Jun Z.,China University of Science and Technology | Zeng X.,China University of Science and Technology
Ceramics International | Year: 2015

Abstract Solid solutions of In2-xScxW3O12 (0≤x≤2) were successfully synthesized using the solid state reaction method. Effects of substituted scandium content on the phase composition, microstructure, phase transition temperatures and thermal expansion behaviors of the resulting In2-xScxW3O12 (0≤x≤2) samples were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and thermal mechanical analyzer (TMA). Results indicate that the obtained In2W3O12 ceramic undergoes a structure phase transition from monoclinic to orthorhombic at 248°C. This phase transition temperature of In2W3O12 can be easily shifted to a lower temperature by partly substituting the In3+ with Sc3+. When the x value increased from 0 to 1, the phase transition temperatures of In2-xScxW3O12 (0≤x≤2) samples decreased from 248 to 47°C. All the In2-xScxW3O12 (0≤x≤2) ceramics show fine negative thermal expansion below their corresponding phase transition temperatures. The negative thermal expansion coefficients of the In2-xScxW3O12 (0≤x≤2) ceramics change in the range from -1.08×10-6°C-1 to -7.13×10-6°C-1. © 2015 Elsevier Ltd and Techna Group S.r.l.


Zhao F.,Yang Zhou University
2011 IEEE 3rd International Conference on Communication Software and Networks, ICCSN 2011 | Year: 2011

Digital libraries have been built all over the world. One of the main challenges in maintaining digital libraries is the digital preservation. The aim of digital preservation is to ensure that digital records are filed and are made available throughout time. Each digital library consists of different documents with different file formats. Due to rapid obsolescence in hardware and software technology it is necessary for the libraries to look into the details of the file formats. Thus the file format for long-term preservation plays a very important role during the practices of digital preservation. The article tries to analyzing the current situation of the file formats, then points out the standards in choosing the file format for long-term preservation based on generalizing the researches by scholars. After comparing the PDF and XML, the author thinks the XML file format is more suitable for long-term preservation. © 2011 IEEE.


Zhao F.,Wuhan University | Zhao F.,Yang Zhou University
2011 IEEE 3rd International Conference on Communication Software and Networks, ICCSN 2011 | Year: 2011

New Zealand's Government Data Management Policies and Government Data Management standards are published during the process of E-government's developing, and they played very significant roles in its informatization and the development of the E-government. The article sums up the characteristics of the Policies and the Standards after introduces the backgrounds of developing them together with their main contents, with expectation to draw some inspirations for China's policy development on E-government. © 2011 IEEE.

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