Now showing items 1-20 of 2359

    • 1800℃烧成含铁SiC纤维的微观结构分析 

      唐学原; 丁马太; 陈立富 (2013-05-15)
      以羰基铁为铁源,制备了含铁SIC纤维,并经1800℃x5MIn烧成。分别以扫描电子显微镜(SEM)、透射电子显微镜(TEM)及其能谱仪(EdS)表征了烧成纤维的微观结构和微区成分。结果表明,烧成纤维由致密的晶粒区及较为疏松的晶间区两部分组成。前者的主要成分是SIC和fE;后者则包括游离碳及SICXOy。烧成纤维的微观组织仍然致密,表明其所含的少量铁具有明显促进SIC纤维高温致密化的作用。
    • 2-去氧-D-葡萄糖的离子色谱法分析 

      洪碧红; 易瑞灶; 方华; 戴李宗 (2010-11-15)
      开发一种分析2-去氧-D-葡萄糖样品的离子色谱方法,该方法可准确定量2-去氧-D-葡萄糖样品的含量.经色谱分离条件优化,选用DIONEX CarboPac PA10(4 mm×250 mm)色谱柱,以18 mmol/L NaOH溶液为流动相,流速为0.8 mL/min,用脉冲安培检测器检测,实现2-去氧-D-葡萄糖、葡萄糖和氨基葡萄糖3种结构极为相似单糖的高效分离,建立起2-去氧-D-葡萄糖的离子色谱法.2-去氧-D-葡萄糖在0.618 ...
    • 2D C/SiC复合材料高温蠕变损伤的显微CT分析 

      冯炎建; 冯祖德; 刘永胜; 栾新刚; 张伟华; 成来飞 (2011-09-15)
      利用显微CT针对自愈合2DC/SiC复合材料高温蠕变试验前后的内部孔隙率进行了分。析结果表明,显微CT技术能较好地探测高温蠕变前后2DC/SiC复合材料内部孔隙率变化,从孔隙率的变化初步证实了BxC组元对2DC/SiC复合材料有一定的自愈合作用。利用显微CT技术证实了高温下的拉伸应力不会导致2DC/SiC复合材料中新的裂纹产生。
    • 2DC/SiC复合材料高温蠕变损伤的显微CT分析 

      冯炎建; 冯祖德; 刘永胜; 栾新刚; 张伟华; 成来飞 (2011)
      利用显微CT针对自愈合2dC/SIC复合材料高温蠕变试验前后的内部孔隙率进行了分。析结果表明,显微CT技术能较好地探测高温蠕变前后2dC/SIC复合材料内部孔隙率变化,从孔隙率的变化初步证实了bXC组元对2dC/SIC复合材料有一定的自愈合作用。利用显微CT技术证实了高温下的拉伸应力不会导致2dC/SIC复合材料中新的裂纹产生。
    • 3-(三聚氧乙烯)取代聚噻吩的合成与聚集增强发光 

      常爱平; 谢建达; 吴清实; 陈守敏; 杜雪; 吴伟泰 (2016-02-20)
      通过2-溴-5-碘-3-(三聚氧乙烯)取代噻吩大分子单体的合成、镍催化缩聚等,得到Mn为6000的3-(三聚氧乙烯)取代聚噻吩(P3OET).在非选择性良溶剂四氢呋喃中,P3OET溶液发射橙色荧光.在选择性极性溶剂诱导作用下,P3OET在水中自组装形成稳定的球形自组装体,荧光峰相对红移而发射橙红色光,伴随荧光强度减弱;而在甲醇中,P3OET形成丝状自组装体,荧光峰相对蓝移而发射亮黄色光,但是荧光强度增强,表现出聚集增强发光现象.类似于含 ...
    • 304不锈钢表面十七氟癸基三甲氧基硅烷的缓蚀性能研究 

      王健军; 陈毅坚; 杨阳; 张贤慧; 张明奇; 吴建华 (2019-02-15)
      采用电化学方法对十七氟癸基三甲氧基硅烷在304不锈钢表面的缓蚀性能进行了研究,结果发现,十七氟癸基三甲氧基硅烷对304SS有明显的缓蚀作用,增大了304不锈钢表面的电荷转移电阻,降低了自腐蚀电流密度并且提高了点蚀电位,缓蚀效率高达96%。
    • A 2.16 eV bandgap polymer donor gives 16% power conversion efficiency 

      Tan Wang; Jianqiang Qin; Zuo Xiao; Xianyi Meng; Chuantian Zuo; Bin Yang; Hairen Tan; Junliang Yang; Shangfeng Yang; Kuan Sun; Suyuan Xie; Liming Ding (2019-12-26)
    • A calcium ion-imprinted porous film prepared from a cellulose-alginate composite 

      Wang, Yong; Zhu, Shiqin; Liao, Yunying; Xiong, Xiaopeng; 熊晓鹏 (Kluwer Academic Publishers, 2014)
      An ion-imprinted (IIP) film has been successfully prepared in this work. Firstly, mixture solution of cellulose and alginate was obtained by dissolving those polymers in a NaOH/urea aqueous solution. Then the mixture ...
    • A carbon-free sol-gel method for preparation of Lu3Al 5O12: Ce3+ phosphors for potential applications in laser scintillators and LEDs 

      Xu, Jian; Chen, Wenwei; Zeng, Renj; Peng, Donglia; 曾人杰; 彭栋梁 (Elsevier, 2014 Octob)
      Ce3+-doped lutetium aluminum garnet (LuAG) phosphors have been successfully synthesized by a facile carbon-free sol-gel method without using any organic gelling agent. Phase transitions from gel to LuAG were well investigated ...
    • A comparative study of pyrolyzed and doped cobalt-polypyrrole eletrocatalysts for oxygen reduction reaction 

      Feng, Wei; Li, Hengyi; Cheng, Xuan; Jao, Ting-Chu; Weng, Fang-Bor; Su, Ay; Chiang, Yu-Chun; 程璇 (APPL SURF SCI, 2012-02-01)
      The pyrolyzed carbon supported cobalt polypyrrole (Co-PPy/C) catalysts were prepared without or with three selected dopants, namely, sodium dodecylbezene sulfonate (DBSNa), sodium paratoluene sulfonate (TSNa) and sodium ...
    • A comparative study of the oxidation behavior of Cr2N and CrN coatings 

      Qi, Z. B.; Liu, B.; Wu, Z. T.; Zhu, F. P.; Wang, Z. C.; Wu, C. H.; 王翠萍; 王周成 (ELSEVIER SCIENCE SA, 2013-Oct 1)
      A comparative study of the oxidation behavior of Cr2N and CrN coatings was investigated in air at temperatures ranging from 700 degrees C to 1000 degrees C including phase structure, surface and cross-sectional morphologies, ...
    • A facile approach to fabrication of well-dispersed NiO-ZnO composite hollow microspheres 

      Xie, Qingshui; Guo, Huizhang; Zhang, Xiangxin; Lu, Aolin; Zeng, Deqian; Chen, Yuanzhi; Peng, Dong-Liang; 陈远志; 彭栋梁 (Royal Society of Chemistry, 2013-12-14)
      A novel, facile and template-free approach was developed for the fabrication of amorphous zinc-nickel citrate hollow microspheres and crystalline well-dispersed NiO-ZnO composite hollow microspheres. In this approach, ...
    • A Facile Route to Construct SiCO Nanospheres with Tunable Sizes 

      Yu, Yuxi; Wang, Han; San, Haisheng; Liu, Yu; Fang, Jiyu; An, Linan; Fang, Qingling; 余煜玺; 伞海生; 刘宇 (WILEY-BLACKWELL, 2014 JUL-A)
      We report a facile route to synthesize SiCO nanospheres using Pluronic F127/ polyvinylsilazane (PVSZ) mixed micelles as a template, in which PVSZ selectively swells with the PEO core of the F127 micelles. The thermal ...
    • A facile solution approach for the preparation of Ag@Ni core-shell nanocubes 

      Ping, Hemei; Chen, Yuanzhi; Guo, Huizhang; Wang, Zhenwei; Zeng, Deqian; Wang, Laisen; Peng, Dong-Liang; 陈远志; 王来森; 彭栋梁 (ELSEVIER SCIENCE BV, 2014-02-01)
      We demonstrate that Ag@Ni core-shell crystals with a cubic morphology can be prepared via a non-aqueous method that employs oleylamine to reduce Ni precursors into metallic Ni which is deposited on the pre-synthesized Ag ...
    • A four-state memory cell based on magnetoelectric composite 

      Shi, Z.; Wang, C. P.; Liu, X. J.; Nan, C. W.; 刘兴军 (2008-07)
      A four-state memory can store four states in each memory cell. We designed a four-state memory cell using Co/PZT magnetoelectric composite and observed a broad magnetoelectric hysteretic output loop on applying magnetic ...
    • A generalized screw dislocation in a piezoelectric trimaterial body 

      周志东 (2007,26(1-)
      A generalized screw dislocation in the piezoelectric trimaterial with two parallel plane interfaces is studied. The Burgers vector of the generalized screw dislocation normal to the isotropic base plane and a discontinuous ...
    • A high performance flexible recyclable supercapacitor with polyaniline by casting in unconventional proportion 

      Zhangfeng Wu; Kaiwei He; Yuzhe Wu; Jie Mao; Zhengchun Yang; Yiting Xu; Conghui Yuan; Birong Zeng; Lizong Dai (2019-12-01)
      Abstract(#br)A new type of recyclable flexible solid-state supercapacitor with good electrochemical performance and folder ability is produced through a facile method. Polyvinylidene fluoride - acetylene black - polyethylene ...
    • A high-resolution study of resonant Auger decay processes in N2O after core electron excitation from terminal nitrogen, central nitrogen and oxygen atoms to the 3 pi LUMO 

      Piancastelli, M. N.; Ceolin, D.; Travnikova, O.; Bao, Z.; Hoshino, M.; Tanaka, T.; Kato, H.; Tanaka, H.; Harries, J. R.; Tamenori, Y.; Prumper, G.; Lischke, T.; Liu, X. J.; Ueda, K.; 刘兴军 (2007)
      Decay spectra of N2O following excitation to the N terminal (Nt). pi*, N central (N-c). pi* and O 1s -> pi* intermediate states are reported. The final states reached after participator decay show resonant enhancement ...
    • A mathematical model for diffusion-controlled monolithic matrix coated with outer membrane system 

      张国亮; ZHANG Guoliang; 石巍; SHI Wei; 张风宝; ZHANG Fengbao; 刘瑛; LIU Ying (2001-02)
      A release model for diffusion-controlled monolithic matrix coated with outer membrane system is proposed and solved by using the refined double integral method. The calculated results are in satisfactory agreement with the ...