摘要：氟化氢(HF)是变电站气体绝缘开关进行故障诊断的重要特征气体之一,因此HF气体的高测量精度,快速响应,实时在线检测的方法是工业和环境领域的研究重点之一。结合激光吸收光谱技术和蒙乃尔钢材加工的耐腐蚀多次反射池搭建HF检测实验系统;分析了HF气体在不同温度下的激光吸收光谱特性,根据HITRAN数据库的HF气体配分函数系数得到配分函数曲线和吸收线强曲线;在研究工作中重点设计了结合激光光谱解析和温度参数修正的浓度反演算法以实现气体浓度的准确检测;结合多次反射吸收池的温度特性利用不同浓度配比的HF样气得到连续实验结果。多次反射池加热后并稳定工作在313和323 K时,温度修正前浓度反演的最大相对误差分别为5.33%和5.87%,温度修正后浓度反演的最大相对误差分别为1.20%和1.47%。通过连续检测和计算,系统在323K时HF检出限为8.7×10^(-5)mmol·mol^(-1),高于290K时的检出限6.3×10^(-5)mmol·mol^(-1)(20 m光程)。尽管高温环境下温度修正后的检测误差大于室温情况,但是同一高温下温度修正后的检测误差仍低于未经过温度修正的值。通过该研究证明了本浓度反演算法工作稳定、可靠,可以满足化工生产现场HF实时监测的需求,对于我国工业HF气体的安全排放监管和环境保护起有效的技术支持。

摘要：An energy-storage system comprised of lithium-ion battery modules is considered to be a core component of new energy vehicles,as it provides the main power source for the transmission ***,manufacturing defects in battery modules lead to variations in performance among the cells used in series or parallel *** variation results in incomplete charge and discharge of batteries and non-uniform temperature distribution,which further lead to reduction of cycle life and battery capacity over *** solve this problem,this work uses experimental and numerical methods to conduct a comprehensive investigation on the clustering of battery cells with similar performance in order to produce a battery module with improved electrochemical *** were first performed by dismantling battery modules for the measurement of performance *** kmeans clustering and support vector clustering(SVC)algorithms were then employed to produce battery modules composed of 12 cells *** verification of the results obtained from the clustering analysis was performed by measuring the temperature rise in the cells over a certain period,while air cooling was *** was found that the SVC-clustered battery module in Category 3 exhibited the best performance,with a maximum observed temperature of 32℃.By contrast,the maximum observed temperatures of the other battery modules were higher,at 40℃for Category 1(manufacturer),36℃for Category 2(manufacturer),and 35℃for Category 4(k-means-clustered battery module).

摘要：设计并制备三种具不同官能团的铱[III]邻菲啰啉配合物:[Ir(ppy)2phen-Br]Cl,[Ir(ppy)2phen-COOH]Cl,[Ir(ppy)2phen-Si]Cl,以及对比参照物[Ir(ppy)2phen-NH2]Cl.其中,ppy为2-苯基吡啶,phen-Br为2-溴-2甲基-N-(1,10-菲啰啉-5-基)丙酰胺,phen-COOH为4-[(1,10-菲啰啉-5-基)氨基]-4-酰基丁烯酸,phen-Si为5-[N,N-二-3-(三乙氧硅)基]酰亚胺-1,10-菲啰啉,phen-NH2为5-氨基-邻菲啰啉,并采用核磁共振(NMR)、质谱(MS)、紫外-可见(UV-Vis)吸收光谱、荧光(PL)光谱法和循环伏安法(CV)等对上述配合物进行了分析和表征.光物理性能研究结果表明:这些配合物在蓝-紫色可见光区域有较强吸收,可发射出明亮的黄色到橙红色荧光,量子效率达到12%以上.相比较于参照物[Ir(ppy)2phen-NH2]Cl(5.78μs),三种新型配合物在量子效率未明显降低甚至提高的前提下,荧光寿命有了显著的提高(9.18–12.00μs).其中,[Ir(ppy)2phen-Br]Cl(1)不但有最高的荧光量子产率(32%)和最长的荧光寿命(12.00μs),而且也具有最好的氧传感性能,I0/I(无氧与纯氧条件下的荧光强度比值)可达到10.91.这使得[Ir(ppy)2phen-Br]Cl有望成为接枝型,较高性能的光学氧传感器的候选氧敏指示剂.除此之外,还通过含时密度泛函理论(TD-DFT)计算对配合物光电性能进行补充说明,理论计算表明:这些配合物是以铱为中心的近似八面体结构,理论计算结果与实际实验数据相一致.

摘要：提出两种慢化体设计方案,第一种方案直接在原有慢化体中引入孔道,第二种方案在慢化体中增加一层铅之后再引入孔道.利用蒙特卡罗方法对两种方案进行研究.计算结果表明,采用第一种方案可以有效地提升C、O元素的测量精度,但同时会降低H、Si等元素的测量精度;采用第二种方案可提高C元素和O元素的测量精度,同时也可以提高H、Si等其它元素的测量精度.

摘要：Photoacoustic imaging, also called optoacoustic tomography, is a non-destructive biomedical imaging technique which employs acoustic detection to image optical absorption contrast with high-resolution deep into scattering tissue. Photoacoustic imaging overcomes the limit of high light scattering in the tissue and realized in vivo high-resolution and high-contrast imaging in the deep tissue. Photoacoustic imaging technology has been rapid development in recent years and make constantly breakthrough from a technical level to the application level. This paper describes the basic principles of photoacoustic imaging technology and make an example analysis by multispectral optoacoustic tomography （MSOT）.

摘要：本文研究受网络通信延时和数据随机丢包的多智能系统一致性问题,探索事件驱动的分布式协同控制策略.首先针对两类普遍应用的事件触发器,提出了一个可用于选择触发策略的触发频率比较方法.然后提出了分布式协同控制律以保证系统的渐近一致性,并给出了相应的时滞依赖Markov切换控制器设计新方法.本文所提的控制策略不仅保证系统一致性目标,而且能显著减少通信数据传输量并降低控制器计算负担.最后,通过仿真算例验证了所提方法的有效性.

摘要：In virtual simulation application, it is often necessary to use Open GL to render large-scale 3D static scenes including urban architectures. Each scene unit generally has individual vertex data and texture. For large-scale data set, it is hard to render all scene units simultaneously. We need to render part of the scene separately, which is called the scene partition and culling. In general, we partition the whole scene into different units on the CPU. We present a scheme that optimize the GPU rendering pipeline to cull the large-scale static scene, which will reduce the CPU suspending time and take full advantage of GPU computing advantages to speed up the rendering efficiency.

摘要：In recent years, image-based anti-aliasing techniques have been widely investigated in real-time computer graphics. Compared to traditional routine of anti-aliasing, image-based methods, which combined with deferred shading, can efficiently decouple anti-aliasing step from standard graphics pipeline. However, most of the existing image-based methods consume video memory, bandwidth and computation resources heavily. In this paper, we propose an optimized anti-aliasing method, which can efficiently reduce the multi-sampling rate by a multi-sampling mask. We carefully designed the rendering system to avoid serial execution on branch divergence, by utilizing both modern GPU’s features and latest shader model. Experimental results demonstrate that our method can achieve high-quality synthesized image with real-time performance.

摘要：为进一步解决我国丘陵山区马铃薯机械化收获问题,依据振动减阻收获机理,设计了一种与手扶拖拉机配套使用的振动挖掘式马铃薯收获机。对该收获机振动挖掘装置作业机理和振动铲运动学、动力学特性进行了研究分析,并确定了振动铲相关结构和工作参数。以机组前进速度、振动铲振频、振动铲振幅为试验因素,伤薯率和明薯率为试验指标进行了三元二次正交旋转组合试验。运用数据处理软件对回归方程进行了显著性分析,并建立了各试验因素与指标之间的数学模型。优化得出最佳因素组合为:机组前进速度0.85 m/s、振动铲振频12 Hz、振动铲振幅14.5 mm、伤薯率1.21%、明薯率98.51%。最佳参数组合下的验证试验结果表明:平均伤薯率1.28%、平均明薯率98.48%,作业性能符合马铃薯收获要求。

摘要：通讯技术不断升级以及移动设备的快速发展极大改善了人们生活,但也带来了电磁干扰和信息安全问题.因此,亟需开发高性能电磁屏蔽材料来抑制电磁辐射和阻止信息泄露.研究发现,在外力作用下填料的自取向行为有助于实现聚合物基复合材料电磁屏蔽性能的提升,因此如何在聚合物基体中构筑有效的填料取向结构正成为电磁屏蔽材料研究的热点.本文首先关注外场诱导复合材料内导电网络的构建策略.随后,梳理了利用外场诱导无机填料取向制备聚合物基电磁屏蔽复合材料的研究进展,其中外场包括温度场、静电场、重力场、机械力场和磁场.值得注意的是,基于外场诱导制备的独特结构与电磁波之间的特殊响应关系通过精选的案例被进一步剖析.最后,提出外场辅助制备聚合物基电磁屏蔽复合材料各自亟待解决的关键科学和技术问题,并对未来的发展方向进行了理性预测.本文讨论的方法和提出的策略有望为高性能聚合物基电磁屏蔽复合材料的创新设计提供一些指导意见.