联合法回收精镉渣中镉和铊的生产实践

主要介绍了精镉渣的来源、化学成份,并根据其成份主要呈金属状态,且沸点区别较大的特点,采用火法与湿法相结合,从精镉渣中回收镉和铊。既解决了无场地堆放的困难,又创造了较大的经济效益。     

双膜法污水处理回用锅炉补充水实验研究

进行了CMF＋RO双膜法处理城市污水中水回用锅炉补水的实验研究,分析了中水处理后回用于锅炉补充水的可行性及经济效益。     

光栅选线TEA CO2激光快速调谐实验研究

研制了一种新型的采用直驱交流伺服电机的光栅选线TEA CO2激光器快速调谐系统,进行了一系列实验研究,包括系统调试实验、单脉冲运转调谐实验和快速调谐实验。实验共得到85条调谐输出谱线，单脉冲能量超过10 J的有18条谱线；在动态快速触发情况下，分别在60 ms和20 ms内实现了整个CO2激光光谱范围任意两条谱线和同一个跃迁带内相邻两条谱线的快速调谐输出。该方法可应用于高功率、大范围可调谐TEA CO2激光器的快速调谐，对高功率高重复频率可调谐TEA CO2激光器研制中的快速调谐输出设计具有较高的参考价值。     

中层顶准单色重力波特性的钠荧光多普勒激光雷达观测分析

利用2011~2013年期间60 h的钠荧光多普勒激光雷达温度和风场数据,采用矢端曲线法提取廊坊上空85~95 km中层顶区域准单色惯性重力波的所有参量,并统计准单色大气重力波的活动特性。获得的85次准单色重力波事件中,上传（下传）重力波64次（21次）,占总数的75。29%（24。71%）。垂直波长（水平波长）和观测周期平均值分别为6。6 km（727。8 km）和7。4 h,分别集中在6~9 km（200~800 km）和2~7 h,固有周期平均值为7。76 h,主要集中在3~9 h,水平传播方向分布比较均匀,没有占主导的传播方向。对于上传重力波,水平背景风在大气重力波水平传播方向上的分量取正值和取负值的概率大致相等,但对于下传重力波,该风场分量取正值的概率大约是取负值的2倍,说明观测到的下传大气重力波在中层顶区域多为顺风传播。     

临近空间多普勒激光雷达技术及其应用（特邀）

研制了车载钠荧光散射多普勒激光雷达和车载532 nm瑞利散射多普勒激光雷达用于测量临近空间大气温度和风场。在钠荧光散射多普勒激光雷达中使用了三频比率多普勒测量方法获得80~100 km的温度和风场。在532 nm瑞利散射多普勒激光雷达中,使用碘分子吸收线边缘技术测量70 km 以下的风场,使用积分方法测量80 km以下的温度。在距离分辨率为1 km、时间分辨率为1 h情况下,40 km处的大气温度、风速测量不确定度约为0.2 K和0.4 m/s;70 km处约为1.5 K和5.5 m/s;92 km处约为0.3 K和1.0 m/s。这两部激光雷达已经在北京、青海、甘肃等地进行了长期观测,应用于临近空间环境特性研究。     

基于PLC与触摸屏的工业搬运机械手控制系统设计

为了提高工业自动线中工件的搬运效率,设计了五自由度搬运机械手控制系统。基于机械手的结构与功能,详细介绍了该机械手的硬件设计与软件编程思路。该系统以S7-200PLC为控制核心,Smart700IE作为监控界面。其运行结果表明,系统具有操作简单、运行稳定可靠、可视化等优点,不仅能够有效提高机械手的生产效率和自动化程度,还可实现运行过程的自动监控,具有较好的应用前景。     

An adaptive waveform-detection threshold joint optimization method for target tracking

The joint optimization of detection threshold and waveform parameters for target tracking which comes from the idea of cognitive radar is investigated for the modified probabilistic data association （MPDA） filter. The transmitted waveforms and detection threshold are adaptively selected to enhance the tracking performance. The modified Riccati equation is adopted to predict the error covariance which is used as the criterion function, while the optimization problem is solved through the genetic algorithm （GA）. The detection probability, false alarm probability and measurement noise covariance are all considered together, which significantly improves the tracking performance of the joint detection and tracking system. Simulation results show that the proposed adaptive waveform-detection threshold joint optimization method outperforms the adaptive threshold method and the fixed parameters method, which will reduce the tracking error. The average reduction of range error between the adaptive joint method and the fixed parameters method is about 0.6 m, while that between the adaptive joint method and the adaptive threshold only method is about 0.3 m. Similar error reduction occurs for the velocity error and acceleration error.     

A novel SINR and mutual information based radar jamming technique

The improvements of anti-jamming performance of modem radar seeker are great threats to military targets. To protect the target from detection and estimation, the novel signal-to-interference-plus-noise ratio （SINR）-based and mutual information （Ml）-based jamming design techniques were proposed. To interfere with the target detection, the jamming was designed to minimize the S1NR of the radar seeker. To impair the estimation performance, the mutual information between the radar echo and the random target impulse response was used as the criterion. The spectral of optimal jamming under the two criteria were achieved with the power constraints. Simulation results show the effectiveness of the jamming techniques. SINR and MI of the SINR-based jamming, the MI-based jamming as well as the predefined jamming under the same power constraints were compared. Furthermore, the probability of detection and minimum mean-square error （MMSE） were also utilized to validate the jamming performance. Under the jamming power constraint of I W, the relative decrease of the probability of detection using S1NR-based optimal jamming is about 47%, and the relative increase of MMSE using Ml-based optimal jamming is about 8%. Besides, two useful jamming design principles are concluded which can be used in limited jamming power situations.     

大气重力波引起的偶发钠层研究

利用了中国科学院临近空间环境野外综合探测站（廊坊,39N,116E）的钠荧光多普勒激光雷达和流星雷达的探测数据对廊坊上空大气重力波引起的偶发钠层（SSL）进行了研究。首先从大气重力波方程出发,计算分析了大气水平风剪切和垂直风场之间的相位关系;其次利用了钠荧光多普勒激光雷达和流星雷达的实测数据对大气重力波引起的偶发钠层进行了分析研究;经研究分析可知,由于大气重力波引起强的水平风切变和垂直风场风向反转的共同作用,其堆积效应使得钠原子密度增强,形成了偶发钠层。     

膳食因素防治阿尔兹海默症的研究进展

随着世界人口老龄化的日益严重,阿尔茨海默症已成为危害老年人健康的重大疾病之一。目前,与生活方式相关的因素如膳食营养、运动在阿尔茨海默症的预防和治疗上引起了人们的广泛关注,大量体内外实验表明,膳食营养干预在防治阿尔茨海默症方面具有重要的意义。本文主要从植物多酚、维生素、脂肪酸及饮食结构等方面综述近年来膳食因素在该疾病防治中的研究进展情况。