摘要：
Cuprous sulfide (Cu2−xS) crystals in different stoichiometries were synthesized by hydro- and solvo-thermal methods at 125 °C using Na2S2O3 as sulfur source in pure water, mixed solvents of ethylenediamine (en) and water, and pure en, respectively. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersion spectrometer (EDS), transmission electron microscope (TEM) and selected area electronic diffraction (SAED). Owing to different sulfur sources, crystal structures and morphologies of cuprous sulfides were different from those developed by some former researchers. Novel twelve-fold symmetrical Cu7S4 single crystals were synthesized at an en/water volume ratio of 3:1, and they were built up by two layers of about 80–100 nm in thickness. Moreover, the possible growth process had been discussed based on the analyses of detailed configuration of the products.
摘要：
In(OH)3 and InOOH crystals were synthesized at different temperatures by diglycol-mediated solvothermal processes. Their phase structures, morphologies and growth mechanisms were investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and chemical analysis. A small quantity of ((H2O)3In)Cl3 was observed in In(OH)3 crystals, which resulted in formation of In(OH)3 crystals with complicated shapes and morphologies. In(OH)3 grew along [1 0 0] direction, while ((H2O)3In)Cl3 grew preferentially along several crystal directions. In-situ transformation from both In(OH)3 and ((H2O)3In)Cl3 to InOOH developed at temperature higher than 140 °C, consequently InOOH nanoparticles partly inherited the morphologies of In(OH)3 nanorods.
作者机构：
[陈传盛] State Key Lab. for Powder Metallurgy, Central South Univ., Changsha 410083, China;[刘天贵; 姚凌江] School of Physics and Microelectronics Sci., Hunan Univ., Changsha 410082, China;[陈小华; 陈传盛] College of Materials Sci. and Eng., Changsha Univ. of Sci. and Technol., Changsha 410076, China
通讯机构：
State Key Lab. for Powder Metallurgy, Central South Univ., China
摘要：
Every n x n generalized K-cent rosy m metric matrix A can be reduced into a 2 x 2 block diagonal matrix (see [Z. Liu, H. Can, H. Chen, A note on computing matrix-vector products with generalized centrosymmetric (centrohermitian) matrices, Appl. Math. Comput. 169 (2) (2005) 1332-1345]). This block diagonal matrix is called the reduced form of the matrix A. In this paper we further investigate some properties of the reduced form of these matrices and discuss the square roots of these matrices. Finally exploiting these properties, the development of structure-preserving algorithms for certain computations for generalized K-centrosymmetric H-matrices is discussed. (C) 2007 Elsevier B.V. All rights reserved.
摘要：
An ultra-high strength aluminum alloy was produced by casting and then extruded to rods. The effect of heat treatment on the microstructure and mechanical properties of the alloy was investigated. After single ageing (120°C, 24 h), the tensile strength was 812.4 MPa and the elongation was 6.2%. After retrogression reaging (RRA), the tensile strength was 751.2 MPa and the elongation was 6.4%. The strengthening mechanism is considered as fine grain strengthening, substructure strengthening and dispersion strengthening by Al3(Sc, Zr).
摘要：
The influences of B2O3/SiO2 ratio and different alkali earth metal oxides MO (M= Ba, Mg, Ca) on the crystallization behavior of B2O3-Al2O3-SiO2 (BAS) glass were investigated by means of DSC, XRD and SEM. With the reduction of B2O3/SiO2 ratio, the crystallization activation energy increases at first and then decreases, reaching the minimum value of 375.4 kJ·mol-1 when the B2O3/SiO2 ratio is 2.2. The crystalline indices (n) are all more than 4, which indicates that the glass is in bulk crystallization. When the glass was heated to 800°C, the primary precipitated crystalline phase was Al4B2O9. With the increase of temperature up to 1100°C, Al18B4O33 and Al5BO9 appeared and became the major crystalline phases in BAS glass-ceramics.
作者机构：
[Xiao, Hanning; Huang, Yangfeng] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.;[Xiao, Hanning; Chen, Shuguang] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410083, Peoples R China.
通讯机构：
[Huang, Yangfeng] H;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
会议名称：
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
会议时间：
2007-05-10
会议地点：
长沙
会议论文集名称：
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))论文集
关键词：
PVP;Surface-modification;ZnO nanorods
摘要：
ZnO nanorods were prepared by a hydrothermal reaction in the presence or absence of PVP (polyvinyl pyrrolidone). The obtained products were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, UV-Vis absorption (UV) spectroscopy and photoluminescence (PL) spectroscopy. The results suggest that PVP plays an important role in the preparation of ZnO nanorods. The UV absorption spectrum showed PVP increases the UV-shielding ability but doesn't influence the transparency in the visible light region. A weak UV emission at 353 nm of PL spectra exhibit the surface of ZnO nanorods is passivated and oxygen-related defects is supplied by PVP.
作者机构：
[Chen Zhao-yong; Zhu Hua-li] Department of Materials Science and Engineering,Changsha University of Science and Technology,Changsha,410076;[Chen Zhao-yong; Shan Ji; Sivakumar Pasupathi; Ben Bladergroen; Vladimir Linkov] SAIAMC,University of the Western Cape,Bellville 7535,South Africa
会议名称：
第十四届国际锂电池会议(The 14th International meeting on lithium Batteries)(IMLB2008)
会议时间：
2008-6-22
会议地点：
天津
会议主办单位：
中国电子学会;中国化学与物理电源行业协会
会议论文集名称：
第十四届国际锂电池会议(The 14th International meeting on lithium Batteries)(IMLB2008)论文集
