摘要：本研究的重点是拓宽共焦显微拉曼光谱技术在液 /气、液 /固界面研究中的应用。通过合理地设计实验 ,利用共焦显微拉曼光谱技术高的纵向分辨率研究了液 /气界面水溶性的卟啉 (TSPP)的聚集行为 ,发现TSPP在本体中和在界面上的行为有着显著的区别。同时 ,对甲醇电化学氧化过程中电极表面附近的溶液成分进行了剖层分析。利用其高的横向分辨率 ,借助表面增强效应对沉积在玻碳上的金薄层进行拉曼成像研究 。

摘要：A hertz-linewidth ultra-stable laser(USL), which will be used to detect the clock transition line, in a strontium optical clock will be launched into the China Space Station(CSS) in late 2022. As the core of the USL, an interference-filter-based externalcavity diode laser(IF-ECDL) was developed. The IF-ECDL has a compact, stable, and environmentally insensitive *** of the IF-ECDL are presented. The developed IF-ECDL can pass the aerospace environmental tests, indicating that the IF-ECDL can be suitable for space missions in the CSS.

摘要：为解决路面裂缝检测中裂缝漏检和定位不准的问题,提出一个结合注意力特征融合的可端到端训练的路面裂缝检测网络。基于Resnet-50结构设计,在特征融合部分添加注意力特征融合模块,通过注意力掩码学习,动态调整浅层特征与深层特征融合权重,突出有用信息,解决裂缝漏检问题;在编码器部分,改进浅层特征与深层特征的选取方式,提升特征融合效果和检测精度。实验结果表明,该网络在各项指标上均优于其它对比网络,具有较高的检测精度。

摘要：Through public arts and my artistic practice to explore how art practice actively contributes to raising civic awareness around issues of social concern in contemporary China.I argue for their contribution to the field of public sculpture in *** case studies will unpack the research process and highlight the aspects of the work that challenge conventions in public sculpture in *** will also draw out the impact of the work with audiences,particularly how media engagement has extended the discourse around the sculptures,disseminating that art can be a powerful vehicle to communicate and interact with the public on subjects that are difficult and complex in *** aim,is at a minimum,to raise social awareness and spark debate in as wide an audience as *** I would want to see the artworks impact on social change and contribute meaningfully to creating a respectful society.

摘要：While thiolate-protected Au nanoclusters （NCs） have drawn considerable interest in various fields, their poor stability in aqueous solution remains a major hurdle for practical applications. Here, we report a unique strategy based on ligand-shell engineering to improve the stability of thiolated Au NCs in solution. By employing two thiol-terminated ligands having oppositely charged functional groups on the surface of the NCs, we demonstrate that the electrostatic attraction between the oppositely charged functional groups of neighboring ligands could amplify the coordination among surface ligands, leading to the formation of pseudo-cage-like structures on the NC surface that could offer higher protection to the Au core in aqueous solution. The strategy developed in this study could be extended to toward practical applications. other metal NCs, further paving the way

摘要：为更好提升区块链和物联网的融合度，提出一种基于信任和主节点选取的拜占庭容错容错共识算法(trusted and primary node election Byzantine fault tolerance, TBFT)。对实用拜占庭容错(practical Byzantine fault tolerance, PBFT)算法进行改进，优先选择快速节点作为主节点；加入直接信任模型实现拜占庭节点、宕机节点的剔除机制，优化一致性协议和视图切换协议。实验及分析结果表明，当网络中的诚实节点数量为34个、宕机和拜占庭节点共16个时，该算法相比PBFT,共识时延下降72%,吞吐量高约37%,系统安全性和稳定性得到了提升。

摘要：介绍了基于电子设计自动化(EDA)仿真的"自顶向下"的电子系统电磁兼容(EMC)设计流程,并将其应用于车载集群通信系统电磁兼容设计中。以某4辆装甲车构成的实际车载集群为例,针对其中的天线互扰、机箱泄漏和印刷电路板(PCB)辐射等各种电磁兼容问题,建立从系统级、设备级到PCB板级的分析流程,给出了相应的EDA分析和设计方法。工程实例表明,"自顶而下"的EMC设计能够有效地预测系统电磁干扰,提高系统电磁兼容水平。

摘要：就基于雷达测量的空间非合作机动目标跟踪相对导航问题进行了研究,提出了一套既能够处理测量粗差,又能使滤波器在存在未知输入情况下快速收敛的相对导航算法。本文将强跟踪滤波器的思想引入到二阶分离插值滤波算法(DDF2),设计DDF2-STF滤波器;另外,本文将DDF2与Huber滤波算法相结合,设计DDF2-Huber滤波器;最后,本文设计了相应的滤波器切换准则,根据不同情况选用DDF2-Huber和DDF2-STF滤波器,从而得到一套完整的相对导航算法。数学仿真证实了所提出相对导航算法的有效性。本文的研究成果为工程设计提供了理论参考。

摘要：将基于二次规划的准解析法优化理论应用于机身主要承力框的设计中 ,建立了机身主要承力框的优化模型 .以承力框重量为目标函数 ,考虑了尺寸约束、强度约束和抗弯刚度约束 ,使优化后的机身结构不但满足强度要求 ,同时使优化后机翼机身对接接头的抗弯刚度与原准机保持一致 .根据优化理论编制了SAAOP(StructureAnalyzingandOptimizingProgram)程序 ,计算结果表明该程序可应用于大型薄壁机身主要承力框的初步设计中 .

摘要：本文提出一种用于非合作目标惯性指向轴位置捕获的绕飞方法。该方法依据实时相对位置和目标位置确定绕飞坐标系;在绕飞坐标系中,分别采用扇形轨迹和直线轨迹设计了两类接近轨迹规划策略,利用相对位置和目标位置间的夹角进行规划策略选择,以规划得到过渡目标位置,并采用CW制导进行过渡目标位置的接近控制;为保证绕飞过程中相对测量敏感器始终有效测量,还设计了姿态指向控制律使追踪航天器x轴指向目标航天器。数学仿真校验了所设计方法的有效性。