企业CIMS集成中的Intranet技术

分析了构筑企业Web计算架构的几种主要技术的特点及缺陷,阐述了多级分布式Web计算模型是今后Web计算的发展方向。最后,介绍了一个基于Web的企业信息系统开发实例     

加工过程质量监控的多代理系统的结构和实现

在分析了与制造有关的多代理技术的基础上,提出了分区的黑板体系和消息／对话框体系相结合的通信机制,研究了代理间消息传递和消息转换的方式,进行了消息转换策略的过程流描述,以及消息传递机制的Petri网描述。给出了多代理系统的体系结构和实现,并应用于加工过程分布式监控系统。     

高速电主轴分布式控制系统的研究

目前,高速电主轴设计的资料相当缺少。根据课题的需要,通过PLC变频使设备运行到额定转速;通过双水外冷系统,较好地解决了发热厉害、温升太高的问题;通过DCS,使现代化生产水平进一步提高。仿真结果表明,各种动态性能比较理想。     

Electrical properties and the role of inhomogeneities at the polyvinyl alcohol/n‐inp schottky barrier interface

In this work, we have investigated the electrical properties of Au/n‐InP contacts with a thin layer of polyvinyl alcohol (PVA) as an interlayer. The current–voltage (I–V) and capacitance–voltage (C–V) measurements are carried out in the temperature range of 175–425 K. The Au/PVA/n‐InP Schottky structure show nonideal behaviors and indicates the presence of a nonuniform distribution of interface states. The temperature dependent interface states densities (N_SS), ideality factor and barrier height are obtained. An abnormal decrease in zero‐bias barrier height (BH) and increase in the ideality factor ( ) with decreasing temperature have been explained on the basis of the thermionic emission theory with Gaussian distribution (GD) of the BHs due to the BH inhomogeneities. The experimental I–V characteristics of Au/PVA/n‐InP Schottky diode has revealed the existence of a double GD with mean BH values of ( ) of 1.246 and 0.899 eV and standard deviation ( ) of 0.176 and 0.137 V, respectively. Consequently, the modified conventional activation energy versus plot gives and Richardson constants ( ) and the values are 1.17 and 0.71 eV and 9.9 and 6.9 A/cm² K², respectively, without using the temperature coefficient of the BH. The effective Richardson constant value of 9.9 A/cm² K² is very close to the theoretical value of 9.4 A/cm² K² for n‐InP. The discrepancy between Schottky barrier heights estimated from I–V and C–V measurements is also discussed. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39773.     

基于CORBA的网络数据库技术

首先对比通过Ｗｅｂ访问数据库的几种技术,引出一种新的技术：ＣＯＲＢＡ;简述了ＣＯＲＡＢＡ的几个重要的特点,在此基础上以人事管理系统为例分析了ＣＯＲＢＡ的工作机理,提出了一种基于ＣＯＲＢＡ的网络数据库的成功实例。     

BOTDR检测钢筋混凝土梁分布式应变的试验研究

为了验证基于布里渊光时域反射计(简称BOTDR)的光纤传感技术应用于桥梁健康监测的可行性,本文在钢筋混凝土简支梁的钢筋和混凝土表面布置了分布式光纤传感系统,对各级荷载作用下构件混凝土和钢筋的应变分布进行了在线监测。试验结果表明,BOTDR光纤传感技术能够准确监测试验梁的应变,并可识别梁的结构性破坏,可以应用于桥梁的健康监测。     

基于分布式传感网络的结构模态识别方法

结构的模态参数识别是结构健康监测系统的基本任务。随着工程结构的日益大型化和复杂化,振动测试时需要布置大量的传感器。传统的集中采集和处理技术将难以胜任海量数据的处理要求,采用无线智能传感器的结构健康监测系统正是应运而生的新方向,而分布式采集和处理是其特点。在无线智能传感网络拓扑结构中采用分布式算法求解结构整体振型,利用随机子空间法识别各子结构模态,结合粒子群优化算法调整子振型获取结构整体振型。通过混凝土钢管拱桥模型试验验证了分布式算法的可行性,并利用模态置信度(MAC)对比分析了由分布式模态识别方法和集中式模态识别方法得到的结果,结果表明两种算法吻合较好。     

热泵型天然气热电冷联供系统实践研究

介绍了一类新型的热泵型天然气热电冷联供系统,系统利用吸收式制冷机在冬季兼作热泵运行,提高了系统的能源利用效率,降低了运行成本,除了增加一个回收冷凝热的换热器外,不会过多增加系统的额外初投资.通过对该系统的理论和实践研究表明,这类系统能充分利用天然气这种高品质能源,提高系统的综合利用效率.     

Analysis of catchment evapotranspiration at different scales using bottom-up and top-down approaches

Physically-based hydrological models are used to predict catchment water balance through detailed simulation of hydrological processes at small temporal and spatial scales. However, annual catchment water balance can also be easily and simply predicted using lumped conceptual model. Comparison between physically-based hydrological models and lumped conceptual models can help us understand the dominant factors on catchment water balance at different scales. In this paper, a distributed physically-based hydrological model (i.e., bottom-up approach) and a simple water-energy balance model (i.e., top-down approach) are used to predict actual evapotranspiration in nine sub-catchments, and the whole basin of the Luan River in northern China. Both simulations give very close values of annual evapotranspiration and show the same complementary relationship between actual and potential evapotranspiration at annual time scale. From the analysis at different time scales through comparison of the top-down and the bottom-up methods, it is shown that the annual catchment evapotranspiration is controlled mainly by annual precipitation and potential evapotranspiration, and the variability of soil water and vegetation becomes more important at a smaller time scale in the study areas. It is also known that the relationship between potential and actual evapotranspiration shows a highly nonlinear relationship at the annual and catchment scale but can be simplified to a linear relationship at hourly temporal and hillslope scales, which is commonly used in the physically-based hydrological models.     

基于MongoDB的HIAF Archive Engine设计与实现

强流重离子加速器装置（HIAF）的控制系统采用实验物理和工业控制系统（EPICS）架构,运行数据存储系统为HIAF运行中的运行数据、历史数据和静态参数提供稳定可靠的存储。针对当前EPICS架构下的数据存储工具仅支持关系型数据库的不足,开发非关系型数据库MongoDB接口,并利用MongoDB嵌套对象和多层级存储结构的特点优化存储表结构,实现波形、图像等非关系型数据的高效存储;为调束人员提供基于标志位PV（Flag PV）方式的加速器运行数据手动存储方案以提升历史数据检索效率及数据可用性;同时针对海量历史数据的存储需要,利用MongoDB Sharding搭建MongoDB分布式集群。