Now showing items 146-165 of 2359

    • C/SiC复合材料微结构的显微CT表征分析 

      冯炎建; 冯祖德; 李思维; 张伟华; 栾新刚; 刘永胜; 成来飞 (2011-04-01)
      利用显微CT表征了采用化学气相渗透法(CVI)制备的3D C/SiC复合材料的三维结构,评价了显微CT的微结构表征能力。结果表明:显微CT能够有效地分辨C/SiC复合材料的织构形貌、材料内部缺陷(孔隙和SiC基体密度差异)。通过重构孔隙的三维结构,揭示了CVI过程预制体内部存在沉积气体滞留;通过重构孔隙壁的形貌,揭示了CVI SiC基体表面为球状颗粒形貌,并与化学气相沉积(CVD)SiC涂层表面SEM形貌进行对比,阐明了预制体内外在气相 ...
    • C/SiC表面SiC涂层氧化的显微CT无损检测与分析 

      冯炎建; 冯祖德; 李思维; 张伟华; 栾新刚; 刘永胜; 成来飞 (2011-05-17)
      对C/SiC复合材料表面SiC涂层在1300℃干氧和湿氧环境中退火处理60 h,利用显微CT技术对高温氧化后的SiC涂层进行无损检测。通过重构SiC涂层不同深度的氧化形貌,并利用SEM、EDS和XRD进行辅助验证,得到沿SiC涂层表面和厚度方向的氧化形貌。结果表明:显微CT能有效地检测氧化后SiC涂层中存在的氧化产物SiO2及其氧化深度,其在表面及深度方向均呈非均匀分布;在干氧环境中SiC涂层的氧化面积沿着涂层的深度方向呈减少趋势,而在 ...
    • (C2H10N2)[BPO4F2]-Structural relations between [BPO4F2]2- and [Si2O6]4- 

      Huang, Y. X.; 黄雅熙; Schafer, G.; Borrmann, H.; Zhao, J. T.; Kniep, R. (2003)
      Colourless crystals of (C2H10N2)[BPO4F2] were prepared from mixture of ethylendiamine, H3BO3, BF3 . C2H5NH2, H3PO4 and HCl under mild hydrothermal conditions (220 degreesC). The crystal structure was determined by single ...
    • (C6H14N2){Zn[ZnB2P4O15(OH)2]· (C6H13N2)Cl}_ A new templated zincoborophosphate 

      Huang, Y. X.; Schafer, G.; Carrillo-Cabrera, W.; Borrmann, H.; Gil, R. C.; Kniep, R.; 黄雅熙 (2003)
      Colorless crystals of (C6H14N2){Zn[ZnB2P4O15(OH)(2)].(C6H13N2)Cl} (1) were prepared from mixtures of ZnCl2, B2O3, diaza-bicyclo[2.2.2] octane (DABCO), and 85% H3PO4 under mild hydrothermal conditions (170 degreesC). The ...
    • Ca1_xLixAl1_xSi1+xN3:Eu2+ solid solutions as broadband,color-tunable and thermally robust red phosphors for superior color rendition white light-emitting diodes 

      Le Wang; 王乐; Rong-Jun Xie; 解荣军; Yuanqiang Li; Xiaojun Wang; Chong-Geng Ma; Dong Luo; Takashi Takeda; Yi-Ting Tsai; Ru-Shi Liu; Naoto Hirosaki (Macmillan Publishers Limited,part of Springer Nature, 2016-10)
      【Abstract】Color rendition, luminous efficacy and reliability are three key technical parameters for white light-emitting diodes (wLEDs) that are dominantly determined by down-conversion phosphors. However, there is usually ...
    • CaCu_3Ti_(4+x)O_(12+2x)陶瓷的电学性能 

      薛昊; 熊兆贤 (2009-08-15)
      采用传统的固相合成方法在1100℃,保温3 h制备了不同Ti含量的CaCu3Ti4+xO12+2x陶瓷(x=-0.5,-0.2,0,0.2,0.5)。通过XRD分析了CCTO的相组成;在-20~100℃温度范围内、500 Hz~1 MHz的频率范围测量了CaCu3Ti4+xO12+2x陶瓷的介电特性和阻抗特性。Ti的化学计量变化明显的影响了CCTO陶瓷的电学性能,系统对比发现Ti的含量偏离CaCu3Ti4O12的化学计量比,会显著的降低 ...
    • Calculation and usage of containment monitor radiation readings during PWR accidents 

      Li, J.; Ye, Y.; Shi, Z.; Wang, J.; 施展 (2006)
      A computer code named CALCON for calculation of containment monitor radiation readings is introduced. The validity of the code was verified by comparison with data given in IAEA technical documents. The contribution of ...
    • Calculation of phase diagrams in AlxIn1-xAs/InP, AsxSb1-xAl/InP and AlxIn1-xSb/InSb nano-film systems 

      Y.Lu; 卢勇; C.P.Wang; 王翠萍; X.J.Liu; 刘兴军 (ELSEVIER SCIENCE BV, 2009-09-15)
      The models for calculation of phase diagrams of semiconductor thin films with different substrates were proposed by considering the contributions of strain energy, the self-energy of misfit dislocations and surface energy ...
    • Calculation of the self-formation driving force for composite microstructure in liquid immiscible alloy system 

      Liu, X. J.; Wang, C. P.; Ohnuma, I.; Kainuma, R.; Ishida, K.; Chen, X. H.; 王翠萍 (2005-02)
      Using Becker's method, we calculate the interfacial energy between two liquid phases in an immiscible system. Based on the Gibbs-Thomson equation, the force acting on the droplet towards the thermal center can be obtained ...
    • Calculation of Thermodynamic Properties in Pure Organic Compounds 

      Li, Y. C.; Wang, C. P.; Liu, X. J.; 刘兴军 (2009-02)
      The reduced Gibbs free energies of 30 types of pure organic compounds were calculated by using the Sanchez and Lacombe model (SL model). The calculated results for each pure organic compound are presented as both polynomial ...
    • Calculations of magnetoelectric properties in three-phase ferroelectric and ferromagnetic particulate composites 

      Shi, Z.; Nan, C. W.; 施展 (2004)
      By the Green's function technique, we obtain the analytic expressions of the effective magnetoelectric property of composites and calculate the effective magnetoelectric properties of the three-phase particulate composites ...
    • CAN引发淀粉与MMA接枝共聚反应的研究 

      朱林晖; 丁马太 (2006-04-20)
      在研究玉米淀粉(corn starch,CS)与甲基丙烯酸甲酯(MMA)接枝共聚反应时发现,硝酸浓度为0.1mol/L、硝酸铈铵(CAN)/CS质量比为1/6、MMA/CS质量比为3/2是兼顾单体转化率(C)、接枝率(G)和接枝效率(GE)的最佳反应条件;同时发现,该反应中均聚物的生成不仅可由CAN直接引发,还可能因淀粉自由基或淀粉接枝物自由基的链转移而引发。
    • CaO-SiO_2基造渣剂除硼的研究进展 

      黄平平; 吴浩; 傅翠梨; 张蓉; 李锦堂; 罗学涛 (2011-10-10)
      太阳能电池中B作为受主杂质在硅基体中的含量不得超过0.3×10-6。造渣氧化精炼是有效的除硼方法之一,综述了CaO-SiO2基造渣剂除硼的研究进展。研究发现,向融硅中连续不断地加入60%CaO-40%SiO2造渣剂,原料硅中的B含量可从40×10-6降至1×10-6。硼分离系数(LB)在低碱度(0.55)到高碱度(1.21)呈明显抛物线形状。添加少量CaF2会增加渣的实际碱度比,但过量的CaF2则起到稀释渣的有效成分和降低渣熔点的作用。 ...
    • CaP/壳聚糖复合膜层的电化学共沉积研究 

      胡仁; 胡皓冰; 林昌健 (2002-12-15)
      用电化学共沉积方法在医用钛合金表面成功制备了 Ca P/壳聚糖复合膜层 ,并用 XRD,SEM,FTIR漫反射光谱和 XPS等对复合膜层化学组成及结构进行表征 .结果表明 ,加入壳聚糖可使钙磷沉积层结构发生显著变化 ,将壳聚糖掺入钙磷沉积层 ,形成 Ca P/壳聚糖复合物和杂化物 .力学实验表明 ,在钛基底表面未进行表面预处理条件下 ,Ca P/壳聚糖复合膜层与钛基底的结合力高达 2 .6 MPa,比单一 Ca P电化学沉积层与基底的结合力提高约 ...
    • CARBON NANOTUBE FILM INTERLAYER TOUGHENED CARBON FIBER REINFORCED EPOXY RESIN HYBRID COMPOSITES 

      Liu, Gang; Hu, Xiao-lan; Zhang, Peng; Yu, Rong-lu; Bao, Jian-wen; Chen, Ming-hai; Li, Qing-wen; Yi, Xiao-su; 胡晓兰 (SCIENCE PRESS, 2013-Oct 2)
      Carbon nanotube film (CNTF) interlayer toughened carbon fiber (CF) reinforced epoxy resin (EP) hybrid composites were fabricated via resin transfer molding (RTM) processing in this paper. Multi-walled carbon nanotubes were ...
    • CARD15 genotype and phenotype analysis in 55 pediatric patients with Crohn disease from Saxony, Germany 

      Sun, L. P.; Roesler, J.; Rosen-Wolff, A.; Winkler, U.; Koch, R.; Thurigen, A.; Henker, J.; 孙莉萍 (2003)
      Objectives: Crohn disease is a chronic inflammatory bowel disorder that is caused by environmental and genetic factors. Mutations in the CARD15 gene have been recently identified to be associated with the disease. Until ...
    • Catalyst microstructure examination of PEMFC membrane electrode assemblies vs time 

      Cheng, X.; Chen, L.; Peng, C.; Chen, Z. W.; Zhang, Y.; Fan, Q. B.; 张颖; 陈亮 (ELECTROCHEMICAL SOC INC, 2004-01)
      A series of single-cell, hydrogen-air proton exchange membrane fuel cells (PEMFCs) was operated for different lengths of time, namely, 200, 500, 700, and 1000 h. A group of reproducible and identical membrane electrode ...
    • CdSe/CdS量子点及量子点@聚苯乙烯荧光微球的制备 

      文凯; 亢宁; 周亚鸣; 陈敏; 林得志; 孙本强; 任磊 (2017)
      针对量子点在聚苯乙烯(PS)微球中包载率不高的问题,首先通过热循环单前驱体耦合法制备出高效发光的CdSe/CdS核壳量子点,再采用配体交换及乳液; 聚合法将制备的CdSe/CdS核壳量子点包载在PS微球中.实验结果表明:所制备的CdSe/CdS核壳量子点的荧光量子产率超过90%;经过配体交换; ,不仅提高了量子点的溶解度,而且PS微球对量子点的包载率提高至87%.该结果对于提高量子点荧光微球在荧光免疫分析中的检测灵敏度具有较重要的意义.
    • CdS纳米颗粒掺杂对ZnO气敏性能的影响 

      徐进; 汤会香 (2009-03-15)
      采用溶胶-凝胶法制备了CdS-ZnO复合纳米颗粒,通过把纳米颗粒旋涂在叉枝Au电极上,制得传感器元件来研究CdS纳米颗粒掺杂对ZnO气敏性能的影响.利用X射线衍射研究了CdS-ZnO纳米颗粒的相结构,研究表明当CdS含量为1%与3%时,ZnO纳米颗粒的结晶度相对较好.透射电镜研究表明:CdS掺杂后,ZnO颗粒仍处在纳米尺度范围,大小约为10 nm,同时小的纳米颗粒容易团聚在一起,形成大小约为200 nm的纳米球.通过对CdS-ZnO纳米 ...
    • Ce_(1-x)Pr_xO_(2-x/2)的溶胶凝胶法的合成及其性质 

      彭程; 程璇; 张颖; 陈志武; 孟健 (2003-06-25)
       利用溶胶 凝胶法合成了Ce1-xPrxO2-x/2(x=0~0.3)系列固体电解质,系统地研究了其结构和导电性。由于溶胶 凝胶法合成的物质粒度均匀,颗粒小,故在较低温度(1300℃)时即可形成高致密度样品。XPS测试表明掺杂后吸附氧浓度明显增大,氧空位增多,电导率和氧离子迁移数增大,改善了CeO2基固体电解质的性能。阻抗谱分析发现,在低温区电导率主要取决于晶界电导,而在高温区电导率主要取决于晶粒电导。