基于固井数据仓库ETL系统的设计

近年来,随着计算机技术和数据库技术的不断进步,固井行业大量数据异构、分布存储的现象日趋明显。如何利用有效的方法整合数据从而指导决策成为了决策者所关心的问题。ETL系统为数据整合提供了令人满意的解决方案。它集数据抽取、清洗、转换、装载等任务与一身,不但满足用户对异构数据源进行整合的需求,也实现了数据的后期更新。本文固井数据仓库ETL系统的设计提出了一种基于元数据的ETL体系结构,并重点设计了元数据管理模块和异构数据转换模块。     

校园一卡通异构数据库接口的设计与实现

异构环境下数据迁移和数据同步,是近年来数据库研究的一个热点。河南工业大学一卡通系统就运行在一个由Solaris、Oracle9i、Linux和SQL Server2000构成的异构系统平台上。本文以河南工业大学校园一卡通系统为背景,在分析当前国内外异构数据库应用技术的基础上,提出了一种基于XML和Web Service的异构数据库互用和同步的方法。最终实现了河南工业大学一卡通系统中基于异构平台的学生交费系统和上网认证计费系统之间的数据迁移和同步。     

医学摄影图像资料异构数据源的整合

本文论述了医学摄影图像资料异构数据源的整合的必要性,面临的问题,并提出了公共编程界面、公共数据库网关和建立中间件异构数据集成平台3种解决方案,重点论述了用网格服务技术实现中间件异构数据集成平台的方法。     

基于Modbus协议的通讯集成技术研究

不同厂家生产的仪表与控制系统(异构系统)之间的通讯互联是一个难点问题,各种通讯集成技术是解决工业仪表控制系统之间互联问题的关键技术,选择异构系统共同支持的主流工业通讯协议标准进行集成是异构系统之间通讯集成的一个核心技术手段。本文重点研究利用Modbus协议实现工业仪表与控制系统之间通讯集成的主要步骤与方法,结合工程实例,给出利用Modbus协议实现异构系统通讯集成的完整解决方案。实际应用效果表明基于Modbus协议的异构系统通讯集成方案能够很好地解决工程中大量的第三方通讯问题。     

适配器模式在异构协议接入IEC61850的转换研究

根据IEC61850标准本身的特点,比较分析异构协议和IEC61850的差异,对其转换功能需求进行分析,以IEC61850的通信体系为基础,采用面向对象的技术提出将适配器模式应用于异构协议接入IEC61850的转换研究。该研究不仅能够实现原有的异构协议向IEC61850的接入,并且异构协议之间也可以通过IEC61850为桥梁实现信息的交互,解决了智能变电站建设中异构协议与IEC61850的信息传递和多种厂家异构协议相互不兼容的问题。     

基于关系模式的XML数据存取技术研究

虽然新的数据库技术如面向对象数据库、XM L数据库等发展很快,但其技术还很不成熟,各领域的数据交换更加频繁,半结构化的数据大量产生,利用关系数据库的成熟技术对这些数据进行存储和处理显得尤其重要。本文介绍了如何实现XM L DTD到关系模式的转换,同时给出了从关系模式到XM L DTD的逆转换,这种转换保持了原XM L DTD的语义约束。     

基于油田企业服务总线的一体化无缝集成技术

设计了基于企业服务总线的一体化集成平台,给出该系统的整体结构与功能模块。异构系统通信主要以C#语言为编程语言,结合Oracle数据库和Web服务技术进行开发;异构系统之间的数据传输通过企业服务总线完成。针对不同系统访问入口不统一的问题,使用基于Cookie的单点登录技术构建了具有统一访问入口的门户平台。实际应用表明:该系统既能满足油田开发技术人员的单项专业需求,又能为各级决策者提供综合性的数据分析成果作为决策参考。     

CAD/CAE集成多型腔模注射浇口优化设计

建立了注射模浇口位置的优化模型,提出了一种采用有限元模型转换代替几何模型转换的方法,克服了几何模型转换不足,实现了有限元模型从CAD系统到CAE系统的方便快捷的"零失真"转换,利用MOLDFLOW软件进行模拟,获取训练样本,运用参数优化系统对多型腔情况下的浇口的位置进行了优化研究,并给出了实例。     

换热设备CAD系统中数据库技术的应用研究

针对热力系统换热设备CAD系统所要实现的功能要求,在对系统及各子系统所涉及到的数据综合分析的基础上,介绍了系统中数据库的规划与设计,给出了系统数据库的结构,探讨了系统中物性参数、工程材料、零部件几何参数和图形数据库的功能与应用。     

SCADA系统中开放式通信模型的设计及应用

针对工业测控系统中现场设备类型众多、各厂家标准不统一、设备难与网络互连的情况 ,提出一种开放式通信网络的设计方案 ,其模块化的框架结构便于实现异构环境中不同RTU间的通信。结合某变电站SCADA系统 ,给出了基于Modbus和CAN协议的多个RTU与通信网络的通信机制。实际运行结果表明 ,该通信系统具有很好的可靠性和实时性     

Comparison of catalytic hydrolysis of bagasse cellulose under heterogeneous and homogeneous systems

The conversion of cellulose into valuable chemicals has attracted a great deal of interest. In this study, heterogeneous and homogeneous systems in the conversion of bagasse cellulose into the total reducing sugars were investigated. In the heterogeneous system, the effects of several critical factors including types and concentrations of ionic liquid, temperature, and time were all investigated for cellulosic conversion. Parameters considered included temperature, dosage of catalyst, and water in the homogeneous system. It was found that the hydrolysis capacity for cellulose in homogeneous system was better than that in heterogeneous system. In addition, the structure and physicochemical properties of the treated cellulose were characterized by Fourier transform infrared spectroscopy, thermogravimetry, and scanning electron microscopy, and then compared with the native fibers. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42228.     

Distributed semi-cooperative filter for a nonlinear multi-agent system with heterogeneous and homologous unknown inputs

In this study, the simultaneous estimation of the states and unknown inputs for a nonlinear multi-agent system with homologous and heterogeneous unknown inputs is performed. The decentralized sub-filter is used to estimate the states and heterogeneous unknown inputs, whereas the distributed sub-filter is used to estimate the homologous unknown inputs. The extended Kalman filter is used to solve the estimation problem for nonlinear systems. Compared with previous studies, the distributed solution is improved to relax the existence of the homologous unknown input sub-filter. Moreover, the updating method of the residual generator is improved to relax the heterogeneous unknown input sub-filter. The practical problem of estimating the state of charge and temperature of the battery pack is used to verify the effectiveness of the proposed filter.     

电弧等离子体裂解甲烷制乙炔

对C-H单相及多相热力学平衡体系进行了比较和计算,在H/C为4时,单相体系中乙炔收率最大值为98.6%,而多相体系中乙炔收率最大值为53.1%。实验考察了影响甲烷转化率、乙炔选择性、乙炔收率以及乙炔能耗的因素,分析了乙炔收率、浓度、能耗三者的关系。实验结果表明,随着甲烷进气量的增加,产品气乙炔等碳氢化合物的浓度逐渐增大,甲烷转化率、乙炔选择性以及收率呈减小趋势,乙炔能耗在出现一个最低值后开始增大。当甲烷进气量达到4.0 m3·h^-1时,得到乙炔能耗的最小值为9.68 kW·h·kg^-1,此时乙炔体积分数为11.4%,乙炔收率为86.2%。淬冷后,乙炔收率增加的最大幅度为18%,减小反应气体的停留时间使乙炔收率提高的最大幅度达到55%     

微反应器中的苯硝化反应

探究了以苯硝化为代表的液-液非均相体系的过程工艺,并分析对比了选择性和转化率的变化状况.结果表明:在温度为40℃、流量为55.8 mL · min-1、停留时间10 s条件下,苯的转化率可达99.5％,产物选择性高达99.5％.与传统工艺相比大大减少反应时间,提高效率,为硝基苯安全生产工艺提供了新思路.     

进化多智能体技术在多目标优化中的应用

针对多目标优化研究中传统遗传算法存在的一些问题,引入人工智能领域新兴发展起来的多智能体技术,结合遗传算法形成进化多智能体系统来求解多目标优化问题.主要对进化多智能体系统框架、进化遗传算法进行了论述.     

Efficient Heterogeneous Asymmetric Catalysis of the Mukaiyama Aldol Reaction by Silica‐ and Ionic Liquid‐Supported Lewis Acid Copper(II) Complexes of Bis(oxazolines)

Lewis acid complexes based on copper(II) and an imidazolium‐tagged bis(oxazoline) have been used to catalyse the asymmetric Mukaiyama aldol reaction between methyl pyruvate and 1‐methoxy‐1‐trimethylsilyloxypropene under homogeneous and heterogeneous conditions. Although the ees obtained in ionic liquid were similar to those found in dichloromethane, there was a significant rate enhancement in the ionic liquid with reactions typically reaching completion within 2 min compared with only 55 % conversion after 60 min in dichloromethane. However, this rate enhancement was offset by lower chemoselectivity in ionic liquids due to the formation of 3‐hydroxy‐1,3‐diphenylbutan‐1‐one as a by‐product. Supporting the catalyst on silica or an imidazolium‐modified silica using the ionic liquid or in an ionic liquid‐diethyl ether system completely suppressed the formation of this by‐product without reducing the enantioselectivity. Although the heterogeneous systems were characterised by a drop in catalytic activity the system could be recycled up to five times without any loss in conversion or ee.     

基于射频识别技术的电力设备规约检测系统

为解决电力设备因通信规约异构而导致的互联互通障碍和数据孤岛问题,提出一种基于无线射频识别(RFID)技术的电力设备规约检测系统设计方案,融合规约信息和设备信息形成电子产品编码(EPC),然后将编码写入RFID电子标签中,再建立一个规约检测数据库,通过对电子标签的自动识别和编码查询,使得设备与应用服务器建立起相应规约的通信连接,实现对规约的分析和检测,并着重对系统的工作原理、总体框架、编码方案和规约检测数据库进行了设计和分析。利用该系统设计方案,能使设备和应用服务器间的通信连接更自动化,适应智能电网的发展趋势,为电力规约通信研究提供参考。     

The heterogeneous catalyst system for the continuous conversion of free fatty acids in used vegetable oils for the production of biodiesel

Biodiesel produced by the transesterification of vegetable oils (VOs) has recently become more attractive on account of its environmental and economical benefits. In this work, a heterogeneous catalyst system was developed for the production of biodiesel from used VOs using a continuous process. The free fatty acids (FFA) contained in the used VOs, which cause several severe problems in transesterification catalysis, were converted to fatty acid methyl esters (FAME) before the main biodiesel production process. The activities of several heterogeneous catalysts on the conversion of FFA were tested, with a WO₃/ZrO₂ catalyst finally being selected. A method for preparing pellet-type catalysts was also developed. The pellet-type WO₃/ZrO₂ catalyst showed highly active and durable catalytic activities in the continuous flow process. The steady state conversion of ca. 70% was obtained in a 140 h durability test. The acidic property and catalytic activity of WO₃/ZrO₂ were attributed to the oxidation state of tungsten.