碳纳米管粉末微电极对儿茶酚的电催化还原

采用粉末微电极来研究修饰和未修饰的碳纳米管电极的电化学特性,结果显示经阳极极化的碳纳米管比未极化的碳纳米管具有明显的催化效果,处理后的碳纳米管修饰的粉末微电极邻苯二酚具有较高的催化活性．     

阵列激光微透镜准直器透镜F数的研究

提出用微透镜阵列把半导体激光器阵列光束进行准直的方案．采用单正透镜对圆高斯光束的变换理论研究了微透镜的Ｆ数,得出了Ｆ数以及最小远场发散角半角值的表达式,对微透镜准直器的设计与制备具有指导意义     

Large scale production of carbon nanotube arrays on the sphere surface from liquefied petroleum gas at low cost

Liquefied petroleum gas (LPG), a cheap industrial material, is used as carbon source to produce carbon nanotube (CNT) arrays on ceramic spherical surface on a large scale in the floating catalyst process. The ceramic spheres provide huge surface area and good mobility, leading to the mass production of CNT arrays continuously. The arrays obtained from the surface are of good alignment, and the purity is as high as 97.5%. With the decrease of the growth temperature, CNTs in the array form with small-diameter of about 13 nm can be obtained. Therefore, with the industrial fuel as carbon source and the ceramic sphere as substrate, CNT arrays can easily be produced on large scale at low cost.     

纳米碳管化学复合镀层摩擦磨损行为

为了进一步提高Ni-P合金镀层的耐磨性,采用化学镀方法使纳米碳管与镍磷在45#钢上共沉积制得纳米碳管耐磨复合镀层。结果表明：纳米碳管已均匀镶嵌在镍磷晶胞上,在干摩擦条件下,纳米碳管复合镀层的耐磨性明显优于纳米碳化硅复合镀层,更优于普通镍磷镀层,并对纳米碳管复合镀层的磨损机理进行了研究。     

基于FPGA+DSP的北斗信号快速捕获算法设计与实现

为了解决北斗卫星接收机中传统并行频率捕获算法傅里叶变换需要处理的数据量大而影响卫星信号捕获速度的问题,提出了一种基于相干降采样的北斗信号快速捕获算法。利用FPGA+DSP（高速数字信号处理器+现场可编程逻辑门阵列）,在传统的并行频率捕获算法中加入相干降采样模块,当信号进行载波剥离和伪码剥离后,通过降低采样频率的方式减小傅里叶变换需要处理的数据量,再对卫星信号进行三维搜索。结果表明,理论上所提算法计算量减少了80%以上,对实际北斗信号进行捕获时,平均每颗星的捕获时间为9.95 ms,内存资源消耗相比于传统并行频率捕获算法减少了42%。因此,新算法能在节约资源的同时有效提高捕获速度,可为进一步提高软件接收机的捕获性能提供参考。     

Reduction of Pt Usage in Fuel Cell Electrocatalysts Using Carbon Nanotubes and Non-Pt Metals

The high-priced and limited Pt constitutes a high barrier to commercialization of fuel cells. Pt is essential for the electrode catalyst of polymer electrolyte fuel cells （PEFCs）. A reduction in Pt usage is one of the key requirements for the commercialization of fuel cells for use in everyday life, because of its high price and limited availability, and the difficulty of finding suitable substitutes. Non-Pt fuel cell catalysts will decrease the demand for Pt by PEFCs, enabling more Pt to be available for use in other essential products, and make fuel cells more popular. The cheaper Mo2C is known to possess similar catalytic activities and electronic structures to Pt. Carbon black （CB） is widely used as the support for Pt nanoparticles. However,     

SnO2纳米线阵列的制备及纳米器件的制作

采用简单的溶胶-凝胶方法在多孔阳极氧化铝模板(AAM)的微孔中制备了高度有序的SnO2纳米线阵列。XRD,SEM和TEM对样品进行了结构和形貌的表征,结果表明,高度有序的SnO2纳米线具有四方相的多晶结构,纳米线连续均匀;并对SnO2纳米线阵列的生长机理进行了探讨;最后用聚焦离子束沉积设备制作了单根SnO2纳米线器件。     

单壁碳纳米管的结构与稳定性

基于价键电荷模型计算了碳纳米管的结合能随管径和手性角的关系．结果表明,单壁碳纳米管的结合能随着管径的增大逐渐降低,也随着手性角的增大而降低．计算结果为从能量的角度理解各类碳纳米管产生丰度提供了理论参考。     

两两NQD随机阵列加权和的弱大数定律和完全收敛性

利用截尾和矩不等式方法研究了在剩余h-可积条件下,两两NQD随机阵列加权和的弱大数定律和完全收敛性,得到两个重要的定理,推广和改进了已有的相应结果.     

利用射线束在TiO2纳米管上负载铜颗粒及其光电性能研究

采用阳极氧化法在钛金属表面制备出致密有序的TiO2纳米管阵列,利用紫外光和电子束辐照沉积技术分别在其上沉积铜纳米颗粒以提高其光电性能.利用场发射扫描电镜观察两种不同技术制备的TiO2纳米管阵列负载纳米铜结构的表面形貌.研究比较了不同制备方法得到的样品在紫外光和可见光照射下的光电效应,并讨论不同浸泡溶液浓度对其光电性能的影响.