摘要：The nano-Si/graphite nanocomposites are the promising anodes candidates for high-energy lithium-ion batteries because of their high theoretical capacities and low volume ***,the nano-Si has a severe tendency to separate from the graphite substrate due to the inherently weak bonding between them,thus leading to the deteriorated cycling performance and low Coulombic ***,we design a robust nano-Si/graphite nanocomposite structure with strong interfacial adhesion caused by the Si—Ti and Ti—C covalent *** abundant Si—Ti and Ti—C bonds formed between nano-Si and graphite greatly enhance the interfacial adhesion force,resulting in the highly stabilized and integrated electrode structure during battery ***,the as-obtained nano-Si/graphite anodes deliver a high capacity retention of 90.0% after 420 cycles at 0.5 C with an average Coulombic efficiency of 99.5%;moreover,a high initial Coulombic efficiency of 90.2% is ***,this work provides a novel strategy to address the poor interfacial adhesion between nano-Si and graphite,which can be applied to other nano-Si based composites anodes.

摘要：针对红外搜索及跟踪系统中折反式光学系统结构复杂,装调困难及成本高的问题,采用了一种一体式折反结构的透镜。在单片透镜的前后表面进行分区域加工,分别镀上内反射膜和增透膜,形成两个反射面和两个透射面,构成折反一体式透镜。将整个光学系统集成在一片透镜上,降低了系统的复杂度和装调难度,提高了系统的稳定性和可靠性。设计了适用于中波红外的紧凑型成像光学系统,远射比达0.62,结果表明该系统像质优良;各视场光学传递函数均大于0.55,接近衍射极限,并且利用二元衍射光学元件在-40℃～60℃实现光学被动消热差;最后利用单点金刚石车床加工出的样机在不同温度下进行成像实验,结果表明在不离焦的情况下,各温度下成像清晰,满足实际加工和应用需求。

摘要：基于微流体在锥形通道内流动的非对称性,设计并制作了一种电磁力驱动的扩散管/汇聚管型无阀微泵,该微泵主体部分由嵌有微型线圈的聚二甲基硅氧烷(PDMS)振动膜和含有微米级锥形管的泵体组成。当在微型线圈中通入交流电信号,线圈中会产生周期性变化的磁场,与外部永磁体产生的恒定磁场相互作用产生振动,并带动PDMS振动膜往复运动。为了提高微泵的泵送性能,将30个锥形管并排连接到泵腔和微泵的进出口处。之后对制备的微泵的性能进行测试,分析了泵送气体的方向,并探究了驱动电压幅值和驱动频率对泵送气体体积流量的影响。测试结果表明,所设计的无阀微泵能够向锥形通道的扩散方向泵送气体,且随着驱动电压和驱动频率的增大,泵送气体体积流量增加。