护环液压胀形法的新发展及外补液胀形法的生产应用

本文论述了现有液压胀形法生产护环所存在的不足,介绍了新一代液压胀形工艺即外补液胀形的原理、优点,以及在我国首次生产应用中所显示出的明显的技术经济效益。     

STRUCTURAL DETERMINATION OF TITANIUM-OXIDE NANOPARTICLES BY X-RAY ABSORPTION SPECTROSCOPY

As a potential application of titanium-oxide nanoparticles, it is extremely important to investigate a detailed picture of the surface and interior structural properties of nanocrystalline materials, such as rutile and anatase with diameters 7.0 and 4.5nm, respectively. X-ray absorption spectroscopy has been used to identify the local Ti environment and related electronic structure. We combine the experimental results at the Ti edge in both bulk and nano-crystals to determine the lattice distortion in terms of differently characteristic preedge features and the variation in the multiple-scattering region of X-ray absorption near-edge structure (XANES) spectra. The relationship between the transition peaks and the surface-to volume ratio is also discussed.     

气冲气推成形触头造型机的实砂机理的探讨

介绍了一种新发明的气冲气推戍形触头造型机实砂机构。它于同一工位、同一工序、用同一动力，实现了气冲紧实与成形触头冲击紧实同时并举。着重从实砂过程计算机检测系统检测的气压、砂压动态变化曲线分析了其实砂机理，并用有色分格填砂的方法从型砂流变的角度进行了验证，表明气冲气推成形触头造型机的实砂过程是一个多重复合实砂的过程。     

Theoretical analysis of β-LaNi5Hx(5≤x≤8): structure and energetics

The calculations of total energy, band structure, and electronic density of states and Mulliken population analysis of β-LaNi5 Hx (5≤x≤8) were performed by adopting the method of total energy based on the density functional theory. The augmented plane wave function was selected as the basis set in combination with ultra-soft pseudo-potential technology. The influence of the amount of H absorbed in alloys was discussed in terms of geometry, electronic structure and thermodynamic derived from calculated results. The results show that the amount of H absorbed and the preferred site occupation of the absorbed hydrogen atoms were controlled by the position of Hbands and the energy gap between H-bands and conduction bands. The β-phase hydrides of LaNi5 are most stable when hydrogen atom capacity coating in the range of 6 - 7.     

手工电弧焊在带压补漏中的应用

压力容器和压力管道在生产过程中会出现泄漏，给生产过程带来影响或使生产中断，带压堵漏是保证生产正常进行的一种必要的技术手段。在此介绍了手工电弧焊带压堵漏的常用方法。     

电子束焊接技术在角锥喇叭天线上的应用

研究了角锥喇叭天线的电子束焊接工艺,并与传统的氩弧焊成形工艺进行了对比.采用正背面成形的对比试验和金相分析法进一步确定了电子束扫描的有效性.解决了喇叭口径精度、单面焊双面成形等技术难点并成功应用于产品.     

XRI解析技术综述与分析

介绍了XRI（extensible resource identifier,可扩展的资源标志符）的基本概念、特征,举例详述了其解析原理和相关应用,并与目前广泛应用的DNS作比较,分析了其应用前景。     

SPEM2XPDL模型转换研究*

将软件过程技术与工作流技术相结合,严格定义了SPEM2XPDL模型转换规则,设计并实现了一个SPEM2XPDL模型转换引擎.此引擎将SPEM描述的软件过程转换为符合工作流定义(XPDL)的工作流过程,从而可基于工作流管理系统对软件过程提供执行支持.SPEM模型经引擎转换后在工作流管理系统Shark上的成功执行表明了引擎的可用性.     

基于XML的校园网格应用研究*

为解决校园网网格应用中软件集成问题,提出了通过基于XML的Java中间件来实现校园网内各部门间数据的转换与匹配。首先通过Java中间件对校园网内旧有异构数据库中的数据进行XML文档化转换;在此基础上给出一套基于开放源代码的J2EE架构来组建以ESB为核心的软件集成系统以实现校园网格应用的基础架构;最后以应用实例的形式在这一架构下完成相应网格应用,并进行了相关性能测试,验证了其有效性和优越性。     

基于排队论和时间需求分析法的实时系统时间行为分析*

针对目前广泛使用的固态优先级RMS调度策略,利用时间需求分析算法对系统中所有周期任务进行可调度性分析测试,保证其在临界点仍可以满足时限。利用排队论中的M/M/1/K排队系统,根据非周期事件接收缓冲和可延期服务器定量分析非周期事件的平均响应时间和系统异步事件丢失率,使之符合系统要求。