一种火控雷达终端显示器的仿真实现

雷达系统的仿真模拟由于成本低、研发周期短、效果好等优点在军队中开始得到广泛应用,雷达系统的模拟训练已成为某些部队军事训练的一种方式。雷达终端显示器的仿真是雷达系统仿真中的一个重要部分,在三维坐标系中对飞行目标航迹的产生进行了建模,并利用C Builder 6.0开发工具,采用多线程技术,对某一火控雷达终端显示器进行仿真,实现了多飞行目标情况下,单个目标捕获跟踪、杂波的模拟、雷达终端数据的实时录入等功能。本设计能很好应用于雷达课程教学和军队雷达手的操作训练中。     

软件化雷达P显实时坐标变换与实现

软件化雷达PPI光栅显示需完成极坐标测量数据向直角坐标的实时转换,而传统的利用简单数学公式直接转换的方式存在映射非均匀和运算量大等难题。基于整体映射和一一映射等不同逆映射方法,研究并提出了一种改进的一一映射新方案。新方法可有效解决量化漏点和区域重叠的问题,显著提高了映射查找表的形成效率,保证了PPI显示效果和实时性。最后,给出了新方法的具体实现流程,比较了与现有方法的效果,证明了新方法的有效性。     

Blackfin ADSP—BF561在高速采集系统中的应用

介绍了以两片Blackfin系列的ADSP—BF561为核心处理器,加上Flash、SDRAM等外围电路．协同处理FPGA输出数据,实现某小型雷达侦察接收系统的信号主处理控制。     

基于S7-200PLC的监控网络设计

利用PC access作OPC服务器,可以方便的实现上位机与S7-200PLC的PPI协议通信。     

基于蛋白质网络的模块动态特性挖掘研究

目前对于蛋白质网络的多数分析方法都是基于静态网络框架提出的,然而,事实上蛋白质之间的相互作用关系是随着时间变化的,具有明显的动态特性。从动态角度出发,基于蛋白质交互网络,结合时间序列的基因表达数据,揭示蛋白质功能模块变化的动态特性,提出了一种动态网络的构建方法及在动态快照网络中挖掘功能模块的算法,采用模糊匹配的方法揭示了蛋白质功能模块的变化过程。实验证明,该方法能够有效地揭示蛋白质功能模块的动态变化特性。     

PPI协议在油气润滑监控系统中的应用

在小型油气润滑监控系统的开发过程中,针对使用现有组态软件开发成本高和自由口方式通讯编程复杂的问题,提出了基于西门子PPI协议使用VC++开发程序的方案。首先基于PPI协议的解析方法,分析了常用读写操作的通讯格式,并设计了系统应用程序;然后在实验室小型油气润滑样机上进行了实验。实验证明,该方案满足设计要求,具有实现简单、调试方便及成本低的优点。     

Development of a partnering performance index (PPI) for construction projects in Hong Kong: a Delphi study

Over the past decade, research studies on benefits, critical success factors, difficulties, process, conceptual and theoretical models of construction partnering have been ubiquitous in the construction management discipline. In fact, there is adequate evidence that an increasing number of client organizations are adopting a partnering approach to undertake their building and construction projects both locally and worldwide during the last decade. With the perceived benefits that partnering brings about, research into Key Performance Indicators (KPIs) to evaluate the success of partnering projects in construction becomes vital as it can help set a benchmark for measuring the performance level of partnering projects. However, although there are some related studies and papers on this research area, few, if any, comprehensive and systematic studies focus on developing a comprehensive, objective, reliable and practical performance evaluation model for partnering projects. A model has been developed using the Delphi survey technique to objectively measure the performance of partnering projects in Hong Kong based on a consolidated KPIs' conceptual framework previously developed for partnering projects. Four rounds of Delphi questionnaire survey were conducted with 31 construction experts in Hong Kong. The results reveal that the top seven weighted KPIs to evaluate the success of partnering projects in Hong Kong were: (1) time performance; (2) cost performance; (3) top management commitment; (4) trust and respect; (5) quality performance; (6) effective communications; and (7) innovation and improvement. A statistically significant consensus on the top seven weighted KPIs was also obtained. Finally, a composite Partnering Performance Index (PPI) for partnering projects in Hong Kong was derived to provide an all‐round assessment of partnering performance. Different partnering projects can now be assessed on the same basis for benchmarking purposes. Construction senior executives and project managers can thus use the Index to measure, evaluate and improve the performance of their partnering projects to strive for construction excellence. Although the PPI was developed locally in Hong Kong, the research method could be replicated in other parts of the world to produce similar indices for international comparison. Such an extension would aid the understanding of managing partnering projects across different geographic locations.     

PLC在锅炉温度串级控制系统中的应用

根据锅炉温度串级控制系统的结构与控制特点,应用MCGS(监视与控制通用系统)组态软件、S7-200PLC及多主站PPI电缆对锅炉夹套和锅炉内胆所组成的温度串级系统进行控制.实验结果表明该锅炉温度串级控制系统与普通的单回路锅炉温度控制系统相比,改善了过程的动态特性、提高了系统的工作频率、具有较强的抗扰动能力和一定的自适应能力,实际应用效果良好.     

Ceramic and polymeric solid electrolytes for lithium-ion batteries

Lithium-ion batteries are important for energy storage in a wide variety of applications including consumer electronics, transportation and large-scale energy production. The performance of lithium-ion batteries depends on the materials used. One critical component is the electrolyte, which is the focus of this paper. In particular, inorganic ceramic and organic polymer solid-electrolyte materials are reviewed. Solid electrolytes provide advantages in terms of simplicity of design and operational safety, but typically have conductivities that are lower than those of organic liquid electrolytes. This paper provides a comparison of the conductivities of solid-electrolyte materials being used or developed for use in lithium-ion batteries.     

立体仓库串行通信控制系统设计

自动化立体仓库堆垛机控制系统采用西门子PLC作为下位机控制其他设备,为实现远程监控,上位监控计算机以组态王6.5设计监控及操作界面,以ACCESS设计数据库进行实时数据采集,并通过PPI协议实现与下位机PLC的串行通信。在上位机进行监控程序及画面的设计,并完成画面的运行。由于组态软件对控制系统的集中管理,并且形成了很好的人机界面,大大提高了工作效率。