光电跟踪系统中扩展目标的成像对比度分析

分析了影响大气层内扩展目标成像对比度的主要因素,研究了整体倾斜校正对扩展目标对比度影响的数学关系,并分析了采用绝对差分算法提取整体相位倾斜的复杂度优化问题。采用快速倾斜镜对成像光束整体倾斜进行校正能够提高扩展目标的成像对比度,降低后端数字图像处理的难度,进一步减少目标识别和跟踪所需要的时间,对提高低对比度目标的光电跟踪效率具有参考意义。     

Multifunctional Silver‐Exchanged Zeolite Micromotors for Catalytic Detoxification of Chemical and Biological Threats

Multifunctional reactive‐zeolite‐based micromotors have been developed and characterized toward effective and rapid elimination of chemical and biological threats. The incorporation of silver ions (Ag⁺) into aluminosilicate zeolite framework imparts several attractive functions, including strong binding to chemical warfare agents (CWA) followed by effective degradation, and enhanced antibacterial activity. The new zeolite‐micromotors protocol thus combines the remarkable adsorption capacity of zeolites and the efficient catalytic properties of the reactive Ag⁺ ions with the autonomous movement of the zeolite micromotors for an accelerated detoxification of CWA. Furthermore, the high antibacterial activity of Ag⁺ along with the rapid micromotor movement enhances the contact between bacteria and reactive Ag⁺, leading to a powerful “on‐the‐fly” bacteria killing capacity. These attractive adsorptive/catalytic features of the self‐propelled zeolite micromotors eliminate secondary environmental contamination compared to adsorptive micromotors. The distinct cubic geometry of the zeolite micromotors leads to enhanced bubble generation and faster movement, in unique movement trajectories, which increases the fluid convection and highly efficient detoxification of CWA and killing of bacteria. The attractive capabilities of these zeolite micromotors will pave the way for their diverse applications in defense, environmental and biomedical applications in more economical and sustainable manner.     

生物医药产业园的电气设计

本文以北京亦庄经济技术开发区生物医药产业园项目的设计为例,阐述了其作为生物医药产业载体的功能设计特点和方法。     

Nutrient release from integrated constructed wetlands sediment receiving farmyard run‐off and domestic wastewater

Constructed wetland sediments are frequently contaminated with nitrogen and phosphorus. There is a risk that accumulated pollutants can either be remobilised or reach the groundwater. Five identical mesocosms, which were filled with subsoil collected from full‐scale integrated constructed wetland (the first cell receives the most contaminated influent), were set up to examine nutrient removal within sediment layers. The results indicated that accumulated nutrients leached out into inflow water and that the sediment capacity of nutrient retention decreased as the wetlands aged. Furthermore, the mesocosm planted with Phragmites australis achieved better treatment results compared with the one planted with Agrostis stolonifera. The risk of contamination to groundwater does not exist because none of the treated water reached the bottom outlet during the study period. Both the bentonite (clay) and biogeochemical processes taking place within sediments proved to be efficient in preventing polluted water from infiltrating into lower lying soils.     

新型连续流三维粒子电极反应器的设计及处理效能的研究

本项目在板框式反应器基础上设计制作出新型连续流三维粒子电极反应器,采用溶胶-凝胶法制备了负载Sb掺杂SnO2平板电极及粒子电极;以杀稗净农药废水为研究对象,优化了粒子电极的催化反应参数。     

水洗羽绒废水处理工程的设计

采用气浮、水解酸化及生物接触氧化相结合的工艺处理水洗羽绒废水,处理规模2000m3/d,工程设计考虑了对羽绒的回收,生物处理后的废水经过滤后回用于水洗羽绒工艺的前段,投入运行后效果良好。     

设备修理试车磨合油再利用技术研究应用

设备大修理后试车磨合润滑油含有水和杂质,导致润滑油提前报废,研究试车磨合油的再利用技术,延长润滑油的使用寿命,节约成本,实现绿色循环经济。     

高氮钢激光电弧复合堆焊层的电化学腐蚀性能

采用电化学腐蚀方法研究了不同焊接参数对堆焊表层腐蚀行为的影响。研究结果表明,堆焊层耐蚀性随堆焊电流I、激光功率P、堆焊速度v的增大呈现先升高后降低的趋势;I=220 A,P=3.2 kW,v=0.8 m/min时,焊缝氮含量较高,试样表面钝化膜稳定性较好,抗点蚀能力最强。观察试样腐蚀形貌发现,I=260 A或v=0.6 m/min时,焊缝表面点蚀坑大而密集,并形成腐蚀沟,焊缝中的树枝晶有连续生长并向外扩展的趋势;P增至3.2 kW时,焊缝中的粗大柱状树枝晶变为均匀细小的条状枝晶,改善了耐蚀性。     

非一致曲率表面下的气压砂轮磨粒剪胀及加工试验研究#br#

针对软固结磨粒气压砂轮在加工异形曲面时,工件所受的切削力以及接触区内磨粒速度因工件曲率发生变化,导致工件不同曲率处材料去除量不均匀的问题, 基于修正的Rowe剪胀理论建立砂轮切削力模型,提出了非一致曲率表面下修正的气压砂轮材料去除模型。通过EDEM软件建立了软固结磨粒气压砂轮模型,分析了砂轮下压量为1.5 mm时工件曲率对接触力以及接触区内磨粒速度的影响。搭建气压砂轮加工试验平台,通过光整加工试验验证修正的材料去除模型。研究结果表明：修正的材料去除模型平均绝对值误差为0.095,而原始的材料去除模型平均绝对值误差为0.291,说明修正的材料去除模型可以用于气压砂轮抛光过程中的定量分析,且工件加工表面划痕明显减少。     

Cf/SiC复合材料低温铣削工艺优化研究

对超硬金刚石刀具低温铣削Cf/SiC复合材料进行工艺优化研究,主要研究聚晶金刚石刀具低温铣削Cf/SiC复合材料过程中,低温冷却介质(干冰、液氮)和冷却工艺参数(阀体出口压力和喷嘴喷射角度)对切削力、加工表面完整性和切屑的影响规律。研究表明:在干冰、液氮低温介质的冷却作用下,工件的加工表面质量得到了较大提高,主切削力显著降低。