物理学在技术型人才培养中的作用

物理学作为自然科学中的带头学科,在培养技术型人才过程中,有着重要的作用。它是现代技术的理论基础,几乎所有的“高、精”技术都与物理的基本概念、原理有着密切的联系。同时物理也是形成科学世界观的基础,并有助于形成良好的科学态度和工作作风。     

开放业务开发模型及其仿真

研究了开放网络环境下的业务融合模型及其特征,探讨了如何向电信领域引入Internet(因特网)业务开发模型。分析比较了开放业务的生成技术之后,提出了一种开放业务开发模型,指出了开放业务环境下业务开发各个环节需要作出的适应性调整。结论是:开放电信网络环境下,业务处理的对象将由传统意义上的物理资源简化为虚拟网络资源,因此业务的开发过程将更多的表现为对虚拟网络资源的配置处理。最后通过"语音呼叫路由器"业务仿真实例,演示了开放业务的开发过程及其针对开放电信环境的适应性调整。     

Parlay的业务移动能力分析

基于Parlay业务规范的开放业务技术是下一代网络研究的重要内容。虽然Parlay业务规范目前已经被电信界普遍接受,但是,Parlay业务规范是否可以满足现在和未来电信业务发展的需求,这仍然是一个尚未解决的问题。论文通过构造两个典型的移动业务模型,并基于Parlay业务规范,设计了相应的实现模型,论证了Parlay业务规范对移动业务的支持能力。为了保证实现模型的正确性,论文采用通信顺序进程(CSP)理论描述了移动业务实现模型。最后得出结论:Parlay业务规范在跨业务管理域的业务调用、用户身份验证和用户业务逻辑传递方面仍然无法支持业务的移动性。     

Serial nuclear transfer improves the development of interspecies reconstructed giant panda (Aluropoda melanoleuca) embryos

Interspecies somatic nuclear transfer (NT) may provide a new approach for preservation of the endangered rare species. Previous interspecies cloning studies have shown that a nucleus from a quiescent somatic cell supports early development of reconstructed embryos in the ooplasm from another species. In this study, we transferred nonquiescent somatic cells from a giant panda into the perivitelline space of the enucleated rabbit oocytes. After electrofusion (at the rate of 71.6%) and electrical activation, 4.2% of the panda-rabbit reconstructed embryos developed to blastocyst in vitro. For improving the development rate of reconstructed embryos, we used serial NT in this study, i.e. blastomeres from reconstructed morulae were transferred into the perivitelline space of the enucleated rabbit oocytes. The fusion rates in the groups of serial I, serial II and serial III were 79.5%, 84.1% and 78.0%, respectively, having no difference with that of somatic group. And the blastocyst rates in serial NT groups were 19.4%, 13.5% and 10.3%, respectively, which are significantly higher than that in somatic NT group. These results indicate that the nuclei from nonquiescent somatic cells can support early development of reconstructed embryos and serial NT can improve the development rate of interspecies reconstructed embryos. These authors contributed equally to this work.     

混合稀土对AB5贮氢合金织构生长特性影响的PLS研究

利用偏最小二乘法（PLS）研究混合稀土组成对贮氢合金的织构生长特性的综合影响,并提出了合金织构择优取向的判据。对于平行于柱状晶织构,择优取向（101） (201)晶面受Nd的影响最为敏感,Ce的影响最小,同时Ce对择优取向的作用与La,Pr,Nd的作用相反;对于垂直柱状晶织构,择优取向（200） (110)晶面受Pr的影响最为敏感,而受Nd的影响最小。     

从合作到冲突--简析麦地那时期的阿拉伯-犹太关系

麦地那时期是伊斯兰教发展和阿拉伯国家初创的重要时期。当时已在阿拉伯半岛上相处近千年的阿拉伯和犹太两个民族的关系也经历了从合作到冲突的演变。造成这种演变的主要原因是双方政治经济实力的变化和各自需求的不同,也是伊斯兰教从初创到传播和阿拉伯民族从统一走向扩张的必然结果。犹太人也就成为阿拉伯人征服的第一个“异族”。     

"世界经济500强"网站建设方案研究

信息技术如何为加入WTO后的中国经济服务,是我国信息产业面临的一个重要问题,本文提出了“世界经济500强”网站建设方案,并从经济和政治背景、建设内容、资金规模和建设周期、社会效益、经济效益分析等方面讨论了它的可行性。     

Hemispherical variations in seismic velocity at the top of the Earth's inner core

Knowledge of the seismic velocity structure at the top of the Earth's inner core is important for deciphering the physical processes responsible for inner-core growth. Previous global seismic studies have focused on structures found 100 km or deeper within the inner core, with results for the uppermost 100 km available for only isolated regions. Here we present constraints on seismic velocity variations just beneath the inner-core boundary, determined from the difference in travel time between waves reflected at the inner-core boundary and those transmitted through the inner core. We found that these travel-time residuals-observed on both global seismograph stations and several regional seismic networks-are systematically larger, by about 0.8 s, for waves that sample the 'eastern hemisphere' of the inner core (40 degrees E to 180 degrees E) compared to those that sample the 'western hemisphere' (180 degrees W to 40 degrees E). These residuals show no correlation with the angle at which the waves traverse the inner core; this indicates that seismic anisotropy is not strong in this region and that the isotropic seismic velocity of the eastern hemisphere is about 0.8% higher than that of the western hemisphere.     

注塑模标准模架三维参数化装配设计

基于ACIS ,以InteSolid作为开发平台 ,运用数据库与参数化相结合的方法 ,采用“同构树”的装配模型 ,实现了注塑模标准模架的三维参数化设计