Now showing items 719-738 of 2359

    • L12结构γ′-Co3(Al1-xWx)相的弹性性质和热力学性质的第一性原理研究 

      刘兴军; 邓斌; 许伟伟; 韩佳甲; 王翠萍 (2017)
      采用第一性原理方法并结合准简谐德拜模型,系统研究了W原子分数对Co基高温合金中γ′-Co3(Al(1-x)Wx)(x=0,0.25,0.50,0.75,1.0)相的弹性性质和热力学性质的影响.研究发现随W原子分数的升高,γ′-Co3(Al(1-x)Wx)相的弹性模量显著提高,而弹性各向异性的程度明显降低,同时γ′-Co3(Al(1-x)Wx)相由延性材料向脆性材料过渡转变.通过分析电荷密度和态密度的计算结果,发现随W原子分数的增大,Co ...
    • L1结构γ′-Co(AlW)相的弹性性质和热力学性质的第一性原理研究 

      刘兴军; 邓斌; 许伟伟; 韩佳甲; 王翠萍 (2017)
      采用第一性原理方法并结合准简谐德拜模型,系统研究了W原子分数对Co基高温合金中γ′-Co(AlW)(x=0,0.25,0.50,0.75,1.0)相的弹性性质和热力学性质的影响.研究发现随W原子分数的升高,γ′-Co(AlW)相的弹性模量显著提高,而弹性各向异性的程度明显降低,同时γ′-Co(AlW)相由延性材料向脆性材料过渡转变.通过分析电荷密度和态密度的计算结果,发现随W原子分数的增大,Co和W之间共价键的结合强度呈现增大的趋势,并 ...
    • La_2O_3对ZnO-Bi_2O_3-B_2O_3系统玻璃结构和介电性能的影响 

      何璇; 杜振波; 范尚青; 曾人杰 (2013-12-15)
      采用烧结法制备添加lA2O3的znO-bI2O3-b2O3系统(以下简称zbb系统)微晶玻璃,借助傅立叶变换红外光谱仪(fTIr)、拉曼光谱分析仪、X射线衍射(Xrd)、热膨胀仪(dIl)和惠普自动电桥(lCr)首次研究添加lA2O3对zbb系统玻璃结构、微晶化、热膨胀系数(α)以及介电损耗(TAnδ)和介电常数(εr)的影响。结果表明:添加量在0~2.0WT.%范围内,lA2O3可以较显著的延缓该系统玻璃的析晶,并显著降低TAnδ和ε ...
    • LaCl_3和Fe_2(SO_4)_3对化学镀Ni-W-P的影响 

      胡光辉; 吴辉煌; 杨防祖; 郑一雄; 王森林 (2003-11-25)
      研究了添加剂LaCl3 和Fe2 (SO4) 3 对化学镀Ni W P沉积速度、镀层组成结构和表面形貌的影响。结果表明 ,三氯化镧质量浓度为 1~ 1 0mg/L时化学镀Ni W P沉积速度提高 ,而大于 1 0mg/L时沉积速度随浓度增加而降低 ,使Ni W P镀层中的W含量降低 ,镀层颗粒尺寸减小。而硫酸铁提高沉积速度、降低镀层中的P含量 ,但对镀层结构和颗粒尺寸影响不大。能量分散谱 (EDS)分析镀层成分的结果表明 ,稀土镧是非消耗性的添加剂 ...
    • Large Co cluster deposition on naturally and artificially patterned substrates 

      Peng, D. L.; Lerondel, G.; Hihara, T.; Sumiyama, K.; Yao, T.; 彭栋梁 (2002)
      Monodispersed Co clusters with mean cluster diameter d=13 nm have been deposited on a stepped graphite surface and a lithography-patterned Si wafer using a plasma-gas-condensation cluster beam deposition apparatus. ...
    • Large magnetoelectric response in multiferroic polymer-based composites 

      Nan, C. W.; Cai, N.; Shi, Z.; Zhai, J.; Liu, G.; Lin, Y.; 施展 (2005)
      A type of multiferroic polymer-based composite is presented which exhibits a giant magnetoelectric sensitivity. Such a multiferroic composite prepared via a simple low-temperature hot-molding technique for common polymer-based ...
    • LCR全自动测试系统 

      邱虹; 熊兆贤; 吉国力; 陈永明 (上海交通大学, 2008-02)
      [中文文摘]介绍LCR全自动测试系统的开发与应用。该测试系统通过计算机把LCR测试仪、高低温试验箱和电子转换开关联接起来,构成一套以计算机为控制中心的电子材料与元件的介电温度特性和频率特性的多通道全自动测试系统,实现了高低温度控制、不同频率变更、多个通道切换、多组数据处理的全自动化,克服了传统手工测试方式费时费力、重复性差、数据统计分析困难、测试环境难以控制等缺点。[英文文摘]This paper reported the development ...
    • Li_2FeSiO_4/C正极材料的固相合成及电化学性能 

      孙姣丽; 陈志娇; 李益孝; 程琥 (2013-12-28)
      以偏硅酸锂、草酸亚铁为原料,通过机械球磨-固相烧结法制得了lI2fESIO4/C正极材料.用X射线衍射(Xrd)和扫描电子显微镜(SEM)表征观察材料的结构和形貌.恒流充放电测试电极电化学性能.结果表明,30OC下1.5~4.8 V电位范围,于10 MA·g-1电流密度恒流充放电测试,lI2fESIO4/C电极首次放电容量达167 MAH·g-1,有良好的电化学性能.
    • Li_2SrSiO_4:Eu--(2+),Tb--(3+)中Eu--(2+)和Tb--(3+)的发光特性和能量传递 

      徐丽丽; 陈毅彬; 曾人杰 (2011)
      用高温固相法在n2/H2=95/5(V/V)还原气氛下合成了lI2SrSIO4:Eu2+,Tb3+荧光粉发光材料,通过荧光光谱研究其发光特性,并从理论上探讨了Eu2+与Tb3+之间的能量转移类型。结果表明:该发光材料主发射峰值550nM,与Eu2+在4f7-4f65d1产生跃迁有关;通过掺杂,共存于lI2SrSIO4基质中的Tb3+通过电多级相互作用将能量传递给Eu2+;在500--650nM范围内对Eu2+具有很强的敏化作用,使其在主 ...
    • Li_2SrSiO_4:Eu~(2+),Tb~(3+)中Eu~(2+)和Tb~(3+)的发光特性和能量传递 

      徐丽丽; 陈毅彬; 曾人杰 (2011-09-15)
      用高温固相法在N2/H2=95/5(v/v)还原气氛下合成了Li2SrSiO4:Eu2+,Tb3+荧光粉发光材料,通过荧光光谱研究其发光特性,并从理论上探讨了Eu2+与Tb3+之间的能量转移类型。结果表明:该发光材料主发射峰值550nm,与Eu2+在4f7-4f65d1产生跃迁有关;通过掺杂,共存于Li2SrSiO4基质中的Tb3+通过电多级相互作用将能量传递给Eu2+;在500~650nm范围内对Eu2+具有很强的敏化作用,使其在主发 ...
    • Linear versus three-arm star polybutadiene: Effects of polymer architecture on the thermodynamic solution behavior 

      Xiong, Xiaope; Eckelt, John; Wolf, Bernhard A.; 熊晓鹏 (American Chemical Society, 2012-12-11)
      The interaction of linear and of three-arm star polybutadiene (PB) with THF was studied in the temperature range between 25 and 55 掳C. Information for dilute solution rests on light scattering experiments; Flory-Huggins ...
    • Liquid crystalline behaviour of chitooligosaccharides 

      Dong, YM; Wang, HW; Zheng, WY; Zhao, YQ; Bi, DX; Zhao, LJ; Li, XF; 董炎明; 郑微云 (CARBOHYD POLYM, 2004-09-13)
      Two chitooligosaccharide samples (COS1 and COS2) were prepared by enzymatic degradation of chitosan. The molecular weight of the main component was determined by mass spectrometry to be 2340 and 4303, respectively. They ...
    • Liquid phase deposition (LPD) of TiO2 thin films as photoanodes for cathodic protection of stainless steel 

      Lei, C. X.; Zhou, H.; Feng, Z. D.; 冯祖德; Zhu, Y. F.; Du, R. G.; 杜荣归 (2012-02-05)
      In this paper, the liquid phase deposition (LPD) technique was developed to prepare TiO2 thin films on ITO conducting glass applied to the photogenerated cathodic protection of SUS304 stainless steel (304SS). The results ...
    • Liquid-immiscibility-induced formation of micron-scale crystalline/ amorphous composite powder 

      Yu, Y.; Takaku, Y.; Nagasako, M.; Wang, C.P; Liu, X.J.; Kainuma, R.; Ishida, K.; 于洋; 王翠萍 (Elsevier Ltd, 2012 June)
      Liquid immiscible alloy systems present a unique opportunity in developing the micron-scale crystalline/amorphous composite powder using the gas atomization method. On the basis of the CALPHAD approach, the compositions ...
    • Liquid-immiscibility-induced formation of micron-scale crystalline/amorphous composite powder 

      Yu, Y.; Takaku, Y.; Nagasako, M.; Wang, C. P.; 王翠萍; Liu, X. J.; 刘兴军; Kainuma, R.; Ishida, K. (ELSEVIER SCI LTD, 2012-06)
      Liquid immiscible alloy systems present a unique opportunity in developing the micron-scale crystalline/amorphous composite powder using the gas atomization method. On the basis of the CALPHAD approach, the compositions ...
    • Lithium diaquamagnesium catena-boro-diphosphate(V) monohydrate, LiMg(H2O)(2) [BP2O8]·H2O, at 173 K 

      Lin, J. R.; Huang, Y. X.; Wu, Y. H.; Zhou, Y.; 黄雅熙 (2008-06)
      The crystal structure of LiMg(H2O)(2)[BP2O8]center dot H2O consists of tubular structural units, built from tetrahedral (1)(infinity){[BP2O8](3-)} borophosphate ribbons and (LiO4)(n) helices running along [001], which are ...
    • Lithium manganese(II) diaquaboro-phosphate monohydrate 

      Zhuang, R. C.; Chen, X. Y.; Mi, J. X.; 宓锦校 (2008-08)
      The title compound, LiMn(H2O)(2)[BP2O8]center dot H2O, is built up of an open framework of helical borophosphate ribbons interconnected by MnO4(H2O)(2) octahedra, forming one-dimensional channels along [001] occupied by ...
    • Local atomic structure in molten Si3Sb2Te3 phase change material 

      Li, Xuelai; Sun, Zhimei; Rao, Feng; Song, Zhitang; Liu, Weili; Sa, Baisheng; 孙志梅 (SOLID STATE COMMUN, 2012-01)
      By means of ab initio molecular dynamics calculations, we have studied the local structures of liquid and amorphous Si3Sb2Te3. The results show that all the constitute elements in liquid Si3Sb2Te3 are octahedrally coordinated. ...
    • Low Temperature Flux Synthesis and Characterizations of a New Layered Barium Borate BaB8O11(OH)(4) 

      Sun, H. Y.; Sun, W.; Huang, Y. X.; Mi, J. X.; 宓锦校 (2010)
      The new hydroxyl barium borate BaB8O11(OH)(4) was synthesized by using a low-temperature molten salt technique with boric acid as flux at 458 K. Its crystal structure was determined from single-crystal X-ray data. The ...
    • Low Temperature Wafer Direct Bonding Using Wet Chemical Treatment 

      Zhao, Yanli; Song, Zijun; Li, Yan; San, Haisheng; Yu, Yuxi; Chen, WZ; Liu, XJ; Dai, P; Chen, YL; Jiang, Z; 余煜玺 (2012)
      In this paper, the low-temperature (less than or equal to 400 degrees C) silicon wafer direct bonding technology using wet chemical surface treatment is proposed. For bonded pairs of silicon-oxide-covered wafers, the optimum ...