Super-oleophilicity Co-doping Co2+/F-/TiO2 one-dimensional nanotubes for photocatalytic denitrification of light oil

In this study, a simple hydrothermal synthesis method was adapted for the preparation of Co-doping Co²⁺/F^-/TiO₂ nanotubes photocatalyst, and the micro-nano structure of catalysts prepared by biomimetic technology which makes the catalyst have super-oleophilicity property. Co²⁺/F^-/TiO₂ revealed improved photocatalytic performance for denitrification of light oil compared to single TiO₂ photocatalysts. The enhance of photocatalytic activity can be attributed to narrowing the band gap, increasing the light response wavelength and exposing more highly active crystal surfaces due to synergistic effects of Co²⁺ and F^? in the photocatalyst.     

南京电视台的数字自动播出系统

本文就南京电视台通过国家广电总局技术鉴定的Doremi全硬盘自动播出系统的情况作了较详细的介绍。从系统设计时的设备选型论证，到系统的安装调试过程都一一作了阐述，特别对系统的核心设备VID，VIServer,Raid Controller作了详尽的描述。对于系统中存在的一些问题也作了客观的说明，并且就这些问题介绍了实际运用中的解决方法，另外对系统使用的Linux操作系统和应用软件的功能亦作了简单介绍。     

Synthesis of zinc oxide nanocrystals by thermal decomposition of Zn-oleate in organic medium

We report the synthesis of uniform-sized hexagonal ZnO nanocrystals by the thermolysis of Zn-oleate complex, which was prepared from the reaction of inexpensive and environmentally friendly reagents such as zinc nitrate and sodium oleate. Two organic compounds with different boiling points, octadecene and octylether, were selected as the medium for thermolysis of Zn-oleate complex. Under optimized reaction conditions, we were able to synthesize ZnO nanoparticles with the size being about 10 nm. X-ray diffraction and transmission electron micrograph (TEM) images confirmed the high crystallinity of the nanocrystals.     

未知室内环境的三维景物描述

景物描述是计算机视觉的一个重要内容。提出了一个利用三维信息对未知景物的描述方法。该方法对三维场景进行物体级和结构级两级描述；根据三维物体分割的结果，首先计算单个物体的最大尺度、形状类型和边集等整体特征，继而推测它们之间的相互位置关系。从数学上推导了“简化边框矩”和“平面惯量张量”的计算公式，并给出了实验结果。     

Decorating multiwalled carbon nanotubes with zinc oxide nanoparticles by thermally decomposing Zn-oleate in an organic medium

Carbon nanotubes decorated with zinc oxide nanoparticles were produced by thermally decomposing a Zn-oleate complex in an octadecene medium. The structure of the ZnO decorating nanotube surfaces was characterized by transmission electron microscopy, scanning electron microscopy and X-ray diffraction. The surfaces were shown to be densely and homogeneously covered by ZnO nanoparticles with a size below 10 nm. The nanoparticles had the wurtzite hexagonal crystal structure and showed good adhesion to the nanotubes. The carbon nanotubes decorated by metal oxide nanoparticles were synthesized at relatively low temperature and non-oxidation environment. Moreover, the large-scale production with low cost can be realized.     

Mechanical properties of (B4C+Al2O3)/Al neutron absorbing materials with various microstructures constructed by hot forging,rolling and extrusion

Science China Technological Sciences -     

Experimental investigations of a prototype reversible pump turbine in generating mode with water head variations

Influences of water head variations on the performances of a prototype reversible pump turbine are experimentally studied in generating mode within a wide range of load conditions(from 25% to 96% of the rated power). The pressure fluctuations of the reversible pump turbine at three different water heads(with non-dimensional values being 0.48, 0.71 and 0.90) are measured and compared based on the pressure data recorded in the whole flow passage of the turbine. Furthermore, effects of monitoring points and load variations on the impeller-induced unstable behavior(e.g. blade passing frequency and its harmonics) are quantitatively discussed. Our findings reveal that water head variations play a significant role on the pressure fluctuations and their propagation mechanisms inside the reversible pump turbine.     

基于三角面片的三维医学图像体视化

为了辅助医生对病变体及其它感兴趣的区域进行定性直至准确的定量分析,文中主要讨论基于三角面片的三维医学图像体视化。对去噪后的二维断层图像提取最外层轮廓并对每层轮廓线进行拐点检测,在相邻两层轮廓间进行轮廓点的匹配和重建,然后通过显示得到物体表面的三维图像,即可实现体数据的可视化。     

某船尾轴液压无键套合联轴器的过盈安装研究

针对某船调距桨更换桨叶后承载功率增加而产生的液压无键套合联轴器的使用安全性问题,对传递扭矩和推力的联轴器箍套、锥套与尾轴的过盈安装进行了研究.首先分析了液压无键套合联轴器的组成及工作原理,接着研究了联轴器过盈安装的厚壁圆筒理论,根据厚壁圆筒某直径处的应力、变形量的表达公式,计算了传递2.8倍额定扭矩时联轴器套合锥面的过...     

Wear behavior of the raw and pre-smashed carbon nanotubes reinforced 6061Al composites fabricated by powder metallurgy

Science China Technological Sciences - The raw and pre-smashed (PS) carbon nanotube (CNT) reinforced 6061Al composites (CNT/6061Al) with different CNT contents were respectively fabricated by...