On the modeling of bending responses of graphene-reinforced higher order annular plate via two-dimensional continuum mechanics approach

This research presents bending responses of FG-GPLRC plates based upon higher order shear deformation theory (HSDT) for various sets of boundary conditions. The rule of the mixture and modified Halpin–Tsai model are engaged to provide the effective material constant of the composite layers. By employing Hamilton’s principle, the governing equations of the structure are derived and solved with the aid of the differential quadrature method (DQM). Afterward, a parametric study is done to present the effects of three kinds of FG patterns, weight fraction of the GPLs, radius ratio, and thickness to inner radius ratio on the bending characteristics of the FG-GPLRC disk. Numerical results reveal that in the initial value of the \(Zt/h\), using more GPLs for reinforcing the structure provides an increase in the normal stresses but this matter is inverse for the higher value of the \(Zt/h\). The results show that considering the smaller radius ratio is a reason for boosting the shear stresses of the structure for each \(Zt/h\). Another consequence is that for the negative value of \(Zt/h\), it is true that by increasing \(h/{R}_{i}\) , the normal stresses increases but if there is positive value for \(Zt/h\), the radial and circumferential stresses fall down by having an increase in the \(h/{R}_{i}\).

     

基于改进RCP的WLAN集中式请求传输研究

针对数据包对信道的竞争,提出了基于RCP的改进方法,论述了改进协议的基本机制,并通过仿真对改进协议性能进行评价。     

自动生成CGI C++/C源程序

主要讨论如何利用软件自动生成ＣＧＩ的Ｃ／Ｃ＋＋源程序。     

无线局域网协议浅析

无线局域网的安全已经成为无线网络发展和应用的焦点问题之一。各大企业及组织为解决WLAN的安全问题，先后推出HiperLan、HiperLan2、HomeRF、802．11、802．11b和802．11i等系列协议，中国也推出了自己的WAPI协议标准。本文对其中一些重点的协议进行介绍，并进行分析比较。     

用MPLS实现的可伸缩Web请求路由

对相关Web分配器技术进行分析，并提出一个新颖的构架来改进在服务器和缓存集群中Web请求路由，MPLS方案利用应用层信息到第二层标签以提高复杂的请求路由功能，而不会发生TCP连接终止瓶颈。需要客户端代理服务器参与为客户请求申请到合适的标签，可用off-the-shelf MPLS交换去执行分配。允许分配器执行一些关健功能实现可伸缩性。     

基于Windows CE.NET实现蓝牙通讯模块的几种方法

蓝牙通讯技术在嵌入式产品中的应用具有极为广阔的前景,微软公司的Windows CE.NET已经成为了主流的嵌入式操作系统之一.论文给出了在Visual Studio 2005中利用托管码并分别采用P/Invoke技术、微软蓝牙嵌入式工具包、OpenNETCF类库和利用本机码来开发Windows CE.NET操作系统下蓝牙通讯模块的几种方法,并在其中对P/Invoke技术、托管码开发、本机码开发等几个关键技术进行了阐述.最后给出了利用托管码和本机码开发蓝牙通讯模块这几种方法的优劣比较和分析.其内容对于在Windows mobile平台下开发蓝牙设备间的通讯具有一定实用价值.     

基于OGSA的网格数据访问和服务

给出了在OGSA(Open Grid Services Architecture)^[2,6]框架中的数据访问和服务的基本观点，提出了支持数据访问和集成服务的OGSA框架OGSA－DAI(OGSA architecture to support data access and integration services)的扩展。OGSA－DAI结构打算为一般性的数据访问和集成服务定义OGSA接口类型，以便成为不同的数据源访问的统一接口。     

基于ZigBee的机车无线定位方法研究

本文以设计一个机车无线定位管理系统为目的,首先介绍了时下主流无线定位技术,分析了它们的优点和缺点,讨论了其在机车定位应用方面的局限性,并在此基础上提出了基于对称双边到达时间测距算法和最小二乘定位算法的车站机车精确定位方法。证明了该方法对由于无线定位设备晶振频率差异导致的测量误差有较高的鲁棒性,具有比其他定位方法都高的定...     

Effects of Doping CeO2, Er2O3 on Properties of TiO2-SiO2 Ceramics for Catalyst Supporter of deNOx

Effects of doping CeO2 and Er2O3 on the mechanical strength, thermal expansion coefficient, sintering temperature of TiO2-SiO2 ceramics were investigated. The experimental results and the microscopic analysis of SEM, XRD, TG-DSC, FT-IR and TEM show that adding CeO2 and Er2O3 into TiO2-SiO2 ceramics can prohibit the growth of its crystal grains, make their size uniform and form them into a dense structure, which finally enhance its mechanical behaviors, and the lower thermal expansion coefficient that leads to an excellent property of thermal shock resistance. After the reforming TiO2-SiO2 ceramics doped by CeO2 was sintered at 1380 ℃, the bending strength reached to 83 MPa, and the thermal expansion coefficient was 9.8×10-6/℃ within the temperature range of 25～800 ℃, which provides a promising basis of making equipped honeycomb catalyst of deNOx.     

新型分布式网络协议——SOAP

介绍了SOAP协议的基础和编码规则，并讨论其与现存网络协议相比有何优越性，最后给出一个基于SOAP协议的应用实例。