An Alternative Method to Analyze Field Distribution in Curved Dielectric Waveguides

A simple and effective method is proposed to analyze the field distribution of a curved dielectric waveguide with rectangular cross-section. Numerical results are compared with the measured values. It is shown that the present approach is effective and reliable.     

大跨度铝合金结构在施工中的要点分析

本文针对大跨度铝合金结构的施工,借鉴上海辰山植物园温室工程为例,介绍了构件的加工精度,现场的定位测量,结构的安装施工.     

基于脉宽调制技术的温度测控仪

本文介绍了一种采用全数字式脉宽调制技术的温度压力测控仪的设计要点，包括一种新颖的电压脉宽转换器，ＰＷＭ控制输出接口，软件智能控制算示等的原理及设计。该仪器具有学习与自修正功能，使用中无需人工调节控制参数，经过长期运行表明，该仪器具有很好的测控精度和很高的可靠性。     

S1240维护经验两则

介绍了S1240计费带制作失败的处理方法及S1240人机命令的跟踪方法。     

总规划师负责制下城市设计管控路径的实践探索——以文化中心类项目为例

随着我国城市建设进入高质量发展、精细化建设、品质化实施的阶段,城市设计意图向实施的有效传导成为高品质建设的首要环节.进而各地相继推出总规划师(总建筑师)负责制来响应现实需求,承担从城市设计到实施的组织、协调和管理的工作,该制度对落实规划发挥着重要作用.伴随设计管理方式的改进、对跨界合作的共识、技术进步的推动及人工智能的发展,总规划师的工作内容、方式也发生了相应变化.通过分析城市设计管控的发展趋势,提出现实条件下所需要解决的重点问题,继而以操作落成的文化中心类项目为案例,总结其对设计管控体系的探索,以期为今后总规划师负责制下城市设计管控体系的构建工作提供参考.     

基于脑电分析技术的景观关注度主成分 量化解析——以南京市玄武湖公园为例

当代风景园林研究密切关注共性心理与景观环境的交互关系,景观关注度成为景观心理描述与环境绩效的重要评价指标。基于风景园林"环境-心理"耦合机制与脑电信号采集技术(EEG)研究进展,结合景观关注度研究相关成果,基于主成分分析法建立了一种景观关注度脑电数据回归模型。以玄武湖公园为例,通过主成分分析法对原始景观因子进行整合筛选,建立变量观测体系并对其景观心理评价要素进行脑电分析,通过算法设定与数据分析获取景观关注度主成分及其量化耦合关系。研究结果表明,玄武湖公园景观色彩丰富度、空间集成度、水体形态变化度3项评价指标对景观关注度起主要作用,景观关注度与景观因子种类呈正相关关系。研究结果为景观心理量化描述与算法分析提供了一种基于脑电数据的景观关注度分析技术,为相关研究纵深开展提供技术支持。     

Cloning and Characterization of Surface-Localized α-Enolase of Streptococcus iniae,an Effective Protective Antigen in Mice

Streptococcus iniae is a major fish pathogen that can also cause human bacteremia, cellulitis and meningitis. Screening for and identification of protective antigens plays an important role in developing therapies against S. iniae infections. In this study, we indicated that the α-enolase of S. iniae was not only distributed in the cytoplasm and associated to cell walls, but was also secreted to the bacterial cell surface. The functional identity of the purified recombinant α-enolase protein was verified by its ability to catalyze the conversion of 2-phosphoglycerate (2-PGE) to phosphoenolpyruvate (PEP), and both the recombinant and native proteins interacted with human plasminogen. The rabbit anti-rENO serum blockade assay shows that α-enolase participates in S. iniae adhesion to and invasion of BHK-21 cells. In addition, the recombinant α-enolase can confer effective protection against S. iniae infection in mice, which suggests that α-enolase has potential as a vaccine candidate in mammals. We conclude that S. iniae α-enolase is a moonlighting protein that also associates with the bacterial outer surface and functions as a protective antigen in mice.     

Adjuvant Immune Enhancement of Subunit Vaccine Encoding pSCPI of Streptococcus iniae in Channel Catfish (Ictalurus punctatus)

Channel catfish (Ictalurus punctatus) is an important agricultural fish that has been plagued by Streptococcus iniae (S. iniae) infections in recent years, some of them severe. C5a peptidase is an important virulent factor of S. iniae. In this study, the subunit vaccine containing the truncated part of C5a peptidase (pSCPI) was mixed with aluminum hydroxide gel (AH), propolis adjuvant (PA), and Freund’s Incomplete Adjuvant (FIA). The immunogenicity of the pSCPI was detected by Western-blot in vitro. The relative percent survival (RPS), lysozyme activity, antibody titers, and the expression of the related immune genes were monitored in vivo to evaluate the immune effects of the three different adjuvants. The results showed that pSCPI exerted moderate immune protection (RPS = 46.43%), whereas each of the three adjuvants improved the immune protection of pSCPI. The immunoprotection of pSCPI + AH, pSCPI + PA, and pSCPI + FIA was characterized by RPS values of 67.86%, 75.00% and, 85.71%, respectively. Further, each of the three different adjuvanted pSCPIs stimulated higher levels of lysozyme activity and antibody titers than the unadjuvanted pSCPI and/or PBS buffer. In addition, pSCPI + FIA and pSCPI + PA induced expression of the related immune genes under investigation, which was substantially higher than the levels stimulated by PBS. pSCPI + AH significantly stimulated the induction of MHC II β, CD4-L2, and IFN-γ, while it induced slightly higher production of TNF-α and even led to a decrease in the levels of IL-1β, MHC I α, and CD8 α. Therefore, we conclude that compared with the other two adjuvants, FIA combined with pSCPI is a more promising candidate adjuvant against S. iniae in channel catfish.     

基于FPGA的频谱分析仪功率触发模块设计

有效的实时功率触发是很多频谱分析工具中缺失的项目,因为传统扫频模式在时域触发事件开始扫描,无法捕捉到触发前发生的事件,不适合完成实时触发。本文提出了一种全数字式的设计,采用XILINX公司的Virtex-5 FPGA搭建功率触发模块,在具有数字采集的系统中能够以数字方式表示和处理信号,并配以大的内存容量,可以捕获触发前及触发后发生的事件,与预设的触发功率进行比较。该设计实现了传统扫频结构难于实现的实时功率触发功能,并通过仿真验证了它的正确性,在实时频谱分析中有重要意义。     

离心压缩机叶轮过盈接触及传递扭矩研究

本文针对某离心压缩机叶轮,详细开展了基于有限元方法的非线性接触分析。深入研究了在离心载荷作用下过盈量和最大Von Mises应力、接触压力以及传递扭矩的关系,并根据叶轮做功传递扭矩的要求,给出了叶轮与轴之间适宜过盈量的设计建议和旋转松脱的甄别方法。