RFID中间件的结构设计

RFID中间件是介于前端读写器硬件模块与后端数据库和应用软件之间的重要环节,它是RFID应用部署运作的中枢。针对目前相关企业的需求,设计了一种面向服务体系（SOA）的实时系统的RFID中间件结构, 并给出了设备管理及询问器相应的UML类图结构,对RFID中间件中各组成部分的作用和构成作了详细地说明。通过对一个基于餐饮系统应用的测试表明,中间件可提高系统的可移植性,增强了系统的可维护性和可靠性。     

防火墙技术浅析

防火墙是内网与外网之间相互通信的第一道关卡,是确保内部网络安全的有力措施.文章介绍了防火墙的基本知识以及主要的防火墙技术,最后给出一种新型防火墙的原理及其性能评价.     

面向网络处理器的数据平面软件设计框架

网络处理器（NP）以数据平面的微码可编程特性，兼顾专用硬件芯片高性能和纯软件解决方案配置灵活性优势，提供解决转发性能与QoS瓶颈的有效途径。以AMCC NP34xx网络处理器为例，总结了NP通用体系结构，研究基于网络处理器架构的数据平面软件设计框架，提出了综合微码与高级语言的混合编程模式和性能优化方法。在此基础上，结合一种二层交换（L2SW）数据平面软件的设计与实现，系统阐述了基于网络处理器的数据平面软件关键实现技术和性能评估策略。     

一种基于JMX的多级网络管理办法

文章通过分析SNMP的集中管理模式,对JMX分级结构进行了研究。提出开发复杂的网络管理系统可结合层次化管理在网络管理中的优势,与JMX架构的灵活易扩展性,使其开发过程得到较为明显的简化。     

基于身份的TLS协议及其BAN逻辑分析

基于身份的密码体制(IBC)轻量、高效,密钥管理方式简单,但缺乏有效安全协议的支持限制了其应用。通过增加支持IBC的加密套件,引入IBC公钥代替RSA证书公钥,减少消息交换数量,提出支持IBC的、高效的基于身份的IB_TLS协议。使用BAN逻辑对其进行形式化分析,证明IB_TLS协议是安全的。     

VLAN间路由的研究与仿真

在配置有多个VLAN的交换式局域网中,VLAN间路由的实现保证了整个网络的畅通运行。分析了VLAN间路由不同实现方法的特点。针对不同的实现方法,分别设计了实验网络模型,并在Packet Tracer软件中进行了仿真,详细阐述了配置过程。仿真结果验证了不同实现方法的可行性。     

一种基于构件库的构件重用支撑系统CRSS

本文设计和开发了一种基于构件库的构件重用支撑系统,使用户能方便地进行构件的集成、浏览、查询及维护。     

Structure of titanium-doped goethite rust

To investigate the influence of titanium addition on the formation and structure of goethite (α-FeOOH) rust which is one of main corrosion products of weathering steel, the artificially synthesized α-FeOOH rusts were prepared by hydrolysis of aqueous solutions of Fe(III) containing Ti(IV) at different atomic ratios (Ti/Fe) in the range 0-0.1. The obtained rusts particles were observed by TEM. Characterization by XRD, N₂ absorption, Mössbauer spectroscopy was also done. TEM observation revealed that the α-FeOOH rust particle size increased with the increase of Ti/Fe, and that Ti-enriched poorly crystalline particles were formed around the rust particles. XRD confirmed that the crystallite size increased with the increase of Ti/Fe, while the XRD peaks decreased in intensity. Specific surface area obtained by N₂ absorption increased with the increase of Ti/Fe. It is deduced from the obtained results that the addition of Ti(IV) increases the crystallite size of α-FeOOH, and produces double domain particles consisting of the particle core and a porous poorly crystalline shell. It is thought that such unique rust structure produced by titanium addition contributes to the protective properties of rust layer of the weathering steel.     

港东油田一区一断块高含水后期开发的几点做法

大港油田港东一区一断块为港东油田的主力断块 ,目前已进入特高含水开发阶段。受发育后期曲流河沉积的影响 ,地层非均质严重 ,加上长期注水开发 ,使断块进入特高含水开发阶段后 ,油层水淹加剧 ,剩余油分散 ,挖潜难度加大。为此 ,1991年对注水最完善的明二单元率先进行油藏描述和剩余油分布规律研究。在此基础上 ,针对开发中存在的实际问题 ,进行了一系列挖潜工作。主要包括 :①实施层系互换 ,完善注采井网 ;②钻加密调整井 ,挖掘死油区 ,提高断层附近及构造高部位剩余油动用程度 ;③实施精细注水 ,充分挖掘低渗透率控制的剩余油。主要从 3个方面整体实施 ,一是增加注水井点 ,缩小注水半径 ,改变液流方向 ,提高注水扫油面积 ;二是加强高含水层的专项治理 ,重点突出注水井的调剖工作 ;三是脉冲注水 ,通过周期性地强弱交替注水 ,提高驱油效率     

The interaction of epoxy adhesives with steel surfaces

Deformable sandwich sheet materials have the advantage to be produced as raw materials and to be formed afterwards to even complex geometries. Moreover they are cost effective and predestinated for mass production. For such systems the necessity is given for a good bonding to guarantee a good shear transfer between the single layers. Because of deformation, failures by delamination often occur at the interface between the metal and the epoxy layer. Therefore investigations at this interface were performed using Atomic Force Microscopy (AFM) and X‐ray Photoelectron Spectroscopy (XPS), to understand the basic effect of the surfaces’ bonding behavior in selected preparation steps of the system. Basic information about the adhesion mechanisms between the stainless steel 316L and the epoxy is given. The chemical interaction between the epoxy and the steel results in a significant reduction of Fe³⁺ to Fe²⁺.