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Yang B.,Ningbo University | Wang Q.,Ningbo University | Zhang W.,Ningbo University | Ouyang S.,Ningbo University | And 3 more authors.
Journal of Luminescence | Year: 2014

Dense transparent glass ceramics containing BaGdF5 and BaLu2F8 nanocrystals were prepared from the Tb3+-activated SiO2-B2O3-BaF2-Lu2O3-Gd2O3 oxyfluoride scintillating glasses by thermal treatment technology. Glass structure was investigated by X-ray diffraction (XRD) and scanning electron micrograph (SEM); the optical properties including transmission, luminescent properties excited under both ultraviolet light and X-ray excitation, and the decay times of the glass and glass ceramics were also investigated. The coexistence of BaGdF5 and BaLu2F8 nanocrystals in the transparent glass ceramics was confirmed by the XRD results, which plays a key role in the improvement of scintillation performance. The density of glass ceramics is higher compared with the precursor glass, and it increases with the increasing temperature of heat treatment. Moreover, a blue-shift in the excitation spectra and the decreasing decay times of Tb3+ ions are obviously observed in the glass and glass ceramics with the increasing heat treatment temperature. Compared with the precursor glass, the enhanced emission intensity of Tb3+ ions in the glass ceramics is associated with the increasing energy transfer efficiency from Gd3+ to Tb3+ ions, which is due to the precipitation of BaGdF5 and BaLu2F8 nanocrystals in glass ceramics. In addition, the energy transfer efficiency from Gd3+ to Tb3+ ions was also discussed by the stretched exponential function. © 2014 Elsevier Inc. All rights reserved. Source

Zhang X.-L.,Shenzhen University | Zhang D.-W.,Jingganshan University | Zhang H.-J.,Shenzhen University | He S.-N.,Shenzhen University | Chen Y.-T.,Shenzhen University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2015

A novel ligand, diethylenetriamine-N,N′,N″-tri(acetyl-p-hydroxybenzoyl hydrazine)-N,N″-bisacetic acid, and its three soluble non-ion transition metal complexes, ML· nH2O (M = Mn, n = 4; M = Co, Ni, n = 2) have been synthesized and characterized on the basis of elemental analysis, molar conductivities, 1H NMR, FAB-MS, TG-DTA analysis, and IR methods. In addition, relaxivity of complexes are determined, The relaxivity (R1) of MnL, CoL, NiL, and Gd(DTPA)2- used as control are 6.33, 2.71, 2.60, and 4.34L·mmol-1·s-1, respectively. The spin-lattice relaxivity of MnL are larger than that of Gd(DTPA)2-. The results showed that complex of MnL may be a potential MRI contrast agent with high spin-lattice relaxivity, good solubility, low osmotic pressure due to non-ion complex. Copyright © Taylor & Francis Group, LLC 2015. Source

Tan B.,Jingganshan University | Zhou X.-Y.,Jingganshan University | Zhou X.-Y.,East China Jiaotong University
3rd International Symposium on Intelligent Information Technology and Security Informatics, IITSI 2010 | Year: 2010

As the demand for global information increases significantly, multilingual corpora has become a valuable linguistic resource for applications to cross-lingual information retrieval and natural language processing. A Web-based English-Chinese bilingual parallel corpus of automatic Construction Technology solved the shortage of bilingual English-Chinese Parallel Corpus. First, some web pages which may be set translation dig of from a particular source, and then from the web pages focused on the external characteristics according to the similarity to extract the candidate web pages in parallel pairs, use of content-based methods on parallel web pages for each of these candidates assessed. In the assessment of the candidate pairs of parallel web pages, this paper design ECVS models of bilingual text similarity assessed based on the classic vector space model. © 2010 IEEE. Source

Liu Y.-Q.,Jingganshan University | Xu Y.-P.,Jingganshan University
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2016

A novel complex, Tb(III)L2(NO3)3 (L is 4, 4′-dimethyl-2, 2′-bipyridine), has been synthesized. Structural analysis was carried out on the basis of X-ray diffraction data, and the title complex is a mononuclear structure which crystallized in Orthorhombic, space group Aba2, with a=14.9374(17) Å, b=18.325(3) Å, c=10.0586(12) Å, α=ß=γ=90°, Z=4, Dc=1.721 Mg/m3, V=2753.3(6) Å-3. Exposed to ultraviolet radiation of 321 nm, the title complex produces strong green light, and it can be a prospective green light material. © 2016 Taylor & Francis Group, LLC. Source

Luo W.-L.,Communication University of China | Xie A.-D.,Jingganshan University | Ruan W.,Jingganshan University
3rd International Symposium on Intelligent Information Technology and Security Informatics, IITSI 2010 | Year: 2010

As a practical scheme carrying out the high performance computing tasks for small research groups and personal researchers, we propose a small Beowulf PC-cluster parallel system based on MPI and Windows by employing a set of PCs and 100M Ethernet. The experimental evaluations on the classical case of computing π show that the system has satisfactory speedup and parallel efficiency. Owing to the 100M Ethernet which has less bandwidth and more communication delay, the speedup and parallel efficiency will come down with increasing working nodes, and a more excellent high speed network should be build. © 2010 IEEE. Source

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