现场总线技术进展

近年来,在计算机开放系统结构的带动下,人们提出了开放式现场总线的要求,并称之为现场总线的要求,并称之为现场总线网络（Ｆｉｅｌｄｂｕｓ）。本文介绍了多种现场总线协议及其应用前景。     

TiAl基合金的抗氧化性及其改善

简要介绍了ＴｉＡｌ基合金的应用及目前存在的主要问题。阐述了在ＴｉＡｌ基合金上不易形成连续的Ａｌ２Ｏ３膜的”氮效应”,指出“氮效应”似乎是阻碍ＴｉＡｌ合金空气中形成连续的Ａｌ２Ｏ３膜的主要障碍。     

循环热处理细化TiAl晶粒

探讨了循环热处理技术在细化ＴｉＡｌ合金晶粒方面的应用。研究表明,粗大的铸态组织）约５００μｍ的全层状组织）经块型转变预处理后,在α转变温度进行６次以上的快速加热－冷却处理,可以显著地细化晶粒。由此还可以制备出２０μｍ的细小全层状组织。晶粒细化的原因是进行快速循环相变破坏了组织跗以及新旧闰向关系。影响细化效果的主要因素有;加热速度、保温时间、冷却速度和循环次数。     

烟气预洗涤处理技术在1 000 MW机组无旁路脱硫系统中的应用

通过分析沁北电厂三期工程1 000 MW机组无旁路脱硫系统,论证了湿法脱硫系统采用预洗涤系统的必要性。阐述了预洗涤系统的流程、设计原则、设备选型及实际应用。实践证明,烟气预洗涤系统在控制油污、粉尘和防止高温烟气进入脱硫系统方面效果良好。     

基于轮廓波系数相关性的图像压缩算法

提出一种基于Contourlet变换域子带内系数相关性的图像压缩算法。通过互信息量的计算,发现Contourlet变换域子带内紧邻的系数之间存在较强的相关性,并且在不同的分解子带中系数之间的相关性强弱呈现出位置上的各向异性。在此基础上,利用局部邻居信息预测当前系数,同时引入多目标约束优化方法得到预测器的权重值,可有效提高预测精度。通过与JPEG2000算法进行实验对比,在一定的压缩比情况下,采用该算法解码后的图像具有较好的细节和纹理特征。     

Design and development of an intelligent context-aware decision support system for real-time monitoring of container terminal operations

This paper describes a case study of the research and development of an intelligent context-aware decision support system (ICADSS) prototype for real-time monitoring of container terminal operations in Hong Kong. We present the system design and development of the prototype system, and discuss the experiences and lessons learned. To the best of our knowledge, this study is the first identifiable application of an intelligent context-aware decision support system for the real-time monitoring of container terminal operations reported in the academic literature. The intelligent context-aware decision support system employs ZigBee-based ubiquitous sensor network (USN) technology. In this study, an ICADSS prototype was built and implemented in a real world setting. The results of the system prototype evaluation are satisfactory and support the contention that it is more effective in supporting the real-time tracking and tracing of container trucks, quay cranes, and rubber-tired gantry cranes in a container terminal. The results also validate the practical viability of the proposed system architecture. Given the contextual details of the study, we present the lessons learned from developing and operating the system in a container terminal and provide suggestions for further research. We hope that the proposed system architecture and developed prototype system can help both practitioners and academics in the further use and research of intelligent context-aware decision support systems.     

Computation Partitioning in Mobile Cloud Computing： A Survey

Mobile devices are increasingly interacting with clouds,and mobile cloud computing has emerged as a new paradigm.An central topic in mobile cloud computing is computation partitioning,which involves partitioning the execution of applications between the mobile side and cloud side so that execution cost is minimized.This paper discusses computation partitioning in mobile cloud computing.We first present the background and system models of mobile cloud computation partitioning systems.We then describe and compare state-of-the-art mobile computation partitioning in terms of application modeling,profiling,optimization,and implementation.We point out the main research issues and directions and summarize our own works.     

基于摩擦功的全钢载重子午线轮胎的磨耗性能研究

以12R22.5全钢载重子午线轮胎为研究对象,采用哈尔滨工业大学开发的轮胎系列有限元分析软件对轮胎的磨耗进行系统研究,给出了在静态、稳态、启动、制动、侧偏和转弯等不同工况条件下轮胎的摩擦功及磨耗方向。结果表明,工况条件对轮胎磨耗程度影响较大,由大到小依次为转弯、制动、启动、侧偏、稳态。另外,工况条件对轮胎横向磨耗分布有较大影响,特别是转弯和侧偏等工况条件。