一种跨平台实时控制系统设备驱动的设计与实现

针对实时控制系统接入各种现场设备并与之通讯的问题,提出并设计了一种跨平台实时控制系统的现场设备驱动。首先概述了设计的基本原理,然后详细阐述了驱动函数,驱动模块,驱动引擎等各模块的设计及在多操作系统平台的实现。最后以实际的使用示例说明设备驱动的使用方法。     

Fuel properties and emissions of soybean oil esters as diesel fuel

The effects of using blends of methyl and isopropyl esters of soybean oil with No. 2 diesel fuel were studied at several steady-state operating conditions in a four-cylinder turbocharged diesel engine. Fuel blends that contained 20, 50, and 70% methyl soyate and 20 and 50% isopropyl soyate were tested. Fuel properties, such as cetane number, also were investigated. Both methyl and isopropyl esters provided significant reductions in particulate emissions compared with No. 2 diesel fuel. A blend of 50% methyl ester and 50% No. 2 diesel fuel provided a reduction of 37% in the carbon portion of the particulates and 25% in the total particulates. The 50% blend of isopropyl ester and 50% No. 2 diesel fuel gave a 55% reduction in carbon and a 28% reduction in total particulate emissions. Emissions of carbon monoxide and unburned hydrocarbons also were reduced significantly. Oxides of nitrogen increased by 12%.     

内网搜索引擎算法的分析与研究

近年来,Intranet不断飞速发展,导致信息量趋于庞大。于是如何让用户查找到自己想要的信息成为Intranet搜索引擎的一个难题。关于这个问题,它将对几种经典的Intranet搜索排序算法进行分析、比较。希望在以后的开发中可以以它为参照,进行相关算法的改进,尽可能的让算法更接近完美,使搜索结果更能符合用户的需求。     

基于OpenGL的图形引擎的设计与实现

近年过,随着图形硬件及图形接口的更新换代,用于游戏的实时图形引擎得到了突飞猛进的发展,各种开源引擎与商业引擎层出不穷。该文旨在运用计算机图形学理论知识,基于OpenGL 3.3的标准以及GLSL着色语言,使用C＋＋语言编写和Visual Studio 2010平台,完成一个拥有模型载入、贴图载入、UI界面、地形系统以及人机交互系统的图形引擎,能够用于游戏场景与漫游类的应用。     

Development of Monolithic Catalysts with Low Noble Metal Content for Diesel Vehicle Emission Control

Monolith washcoated catalysts with potential for diesel emission control have been developed. Two types of catalysts have been prepared for further study: (1) MnO _x supported on granulated -Al₂O₃, (2) MnO _x supported on cordierite monolith washcoated with -Al₂O₃. Both catalysts have been calcined at 500 and 900 °C and subsequently modified by doping with 0.1–1.0 wt% of Pt or Pd. The influence of the concentration of both manganese oxide (0–10 wt%) and noble metals Pt and Pd in the range 0–1.0 wt% on the catalytic activity in methane oxidation has been studied. Comparison of the catalytic activity of MnO _x /Al₂O₃ and MnO _x + Pt(Pd)/Al₂O₃ with that of a standard 1 wt%Pt/Al₂O₃ catalyst shows the existence of a synergetic effect. This effect is more pronounced for the samples calcined at 900 °C. The developed monolithic catalysts MnO _x + Pt(Pd)/Al₂O₃ demonstrate higher activity and thermal stability (up to 900 °C) compared to the commercial monolithic catalyst (TWC's).     

基于KPCA和SVM的火箭发动机试验台故障诊断方法

为了解决液体火箭发动机试验台的故障诊断问题,提出了一种基于核主元分析(KPCA)特征提取和支持向量多分类机(SVM)的故障诊断方法,该方法首先利用核主元分析对试验台标准故障样本进行特征提取,通过特征分析,建立适合于试验台故障状态识别的层次多分类支持向量机,并对其进行训练,然后将试验数据在主元上投影,输入到训练好的支持向量多分类器,对试验台故障状态进行识别.该方法充分利用了核主元分析强大的非线性特征提取能力和支持向量分类机良好的小样本泛化特性,解决了试验台故障诊断中的小样本、非线性模式识别问题.对试验台的试验结果表明,该方法是有效的、可行的.     

广义不可逆Miller热机循环的性能优化

建立了考虑工质变温热容、热漏、有限时间传热、摩擦损失、非等熵绝热压缩和非等熵绝热膨胀过程的空气标准的不可逆Miller热机循环模型.应用有限时间热力学理论导出了该模型下的输出功率和效率的解析表达式.通过数值计算,得出了输出功率与效率之间的关系,并作图来反映它们的变化情况.讨论了热漏损失、摩擦损失、内不可逆性和工质变温热容对该热机各种性能参数的影响,同时给出了一些重要参数的优化范围.所得结果对实际Miller热机的优化设计提供了理论依据.     

基于设计模式的阴影管理模块的结构研究

给出了一种基于设计模式的游戏引擎中阴影管理模块结构的设计方法．通过对阴影管理模块的任务分析,设计了该模块的功能交互结构和算法框架结构．该设计结构的优点是,使得游戏引擎的阴影管理模块更易于使用且便于扩展,同时可以更有效地利用图形硬件所支持的高级特性．     

3D Simulation Research on Urea-SCR DeNO<em>x Catalyst for Diesel Engine

In order to reduce oxides of nitrogen (NOx) emanated from a diesel eng ine, a comprehensive urea selective catalyst reduction (SCR) DeNOx catalys t was modeled in which numerical simulations were used as a complementary tool f or the experimental investigations to make the design decisions, and hence short en the development process. In this approach, relevant conversion reactions were studied in 1D model, and the parameters obtained in this way were transferred t o 3D simulations. According to the results ...     

Finite Element Modeling and Modal Analysis of Complicated Structure with Bolted Joints

A contact bolt model is proposed as a new modeling technique to investigate the complex structure with bolted joints for modal analysis and compared with the coupled bolt model,and the test results are given.Among these models,the coupled bolt model provides the best accurate responses compared with the experimental results.The contact bolt model shows the best effectiveness and usefulness in view of operational time.The bolt models proposed in this study are adopted for a dynamic characteristic analysis of...