富士通与NTrDoCoMo合力演示FOMA

已经在宽带和固定业务领域取得中国市场认可的富士通此次重拳出击，全面、生动地展示其业界领先的3G解决方案。富士通与NTTDoCoMo合作，在现场搭建了与     

汽车领域的专有架构保卫战

EDN Europe,在2005年12期和2006年2月期中报道说,ARM架构在汽车和工业市场上获得越来越多的接受,而在传统上这是专有设计的领地(参考文献1和参考文献2).     

光纤陀螺及其军事应用

光纤技术作为一项新兴技术,性能优异、应用潜力巨大,而光纤陀螺是其中研究最为活跃的一种传感器。美国的瓦利(V.Vali)和肖迪尔(R.W.Shortill)于1976年提出的光纤陀螺引起广泛关注。光纤陀螺因其体积小、抗电磁辐射和冲击能力强、寿命长、易于集成、成本低等优点而飞速发展,广泛     

Radiative Energy Shifts of an Accelerated Multilevel Atom Coupled to the Derivative of a Scalar Field

We study the energy level shifts of an accelerated multilevel atom in dipole coupling to the derivative of a quantum massless scalar field and separately calculate the contributions of vacuum fluctuations and radiation reaction to the shifts. It is found that, in contrast to the case of a monopole-like interaction, both the vacuum fluctuations and radiation reaction contributions are changed by acceleration, and they all contain non-thermal correction terms. Our results suggest that the effect of acceleration on the energy shifts is dependent on the type of the interaction between the atom and the quantum field.     

Thermal Entanglement of Anisotropic XY Chains in a Transverse Field

By using the concept of concurrence, we numerically investigate the thermal entanglement between any two nearest-neighbour spins in uniform and periodic anisotropic XY chains in a transverse field at finite temperature T. It is found that the entanglement has more than one critical temperatures on some parameter regions for uniform and periodic chains. We also discuss the behaviour of the thermal entanglement at the vicinity of quantum phase transition of periodic anisotropic XY chains and find that a11 the derivatives aλC have similar behaviour as that of the uniform chain.     

Electric Field Enhancement of Nano Gap of Silver Prisms

Using numerical calculation, we examine the effects of gap distance of a pair of nano gap silver prisms with rounded corners on the local light intensity enhancement. Two peaks due to localized surface plasmon （LSP） excitation are observed in a wavelength range from 900nm to 300nm. The results demonstrate that peaks at a longer and a shorter wavelength corresponded to dipole-like and quadrupole-like LSP resonances, respectively. It is found that a gap distance up to 20 nm provides larger light intensity enhancement than that of a single silver nano prism with rounded corners. Furthermore, nano gap silver prisms are fabricated by direct focused ion beam processing, and we measure the scattering light spectrum of a pair of nano prisms by a confocal optical system. However, the two LSP peaks are not observed in visible range because the sizes of the nano gap and prisms are too large.     

Higher Dimensional Strange Quark Matter Coupled to the String Cloud with Electromagnetic Field Admitting One Parameter Group of Conformal Motion

We solve Einstein＇s field equations in higher-dimensional spherically symmetric spacetime with strange quark matter attached to the string cloud, assuming one parameter group of con formal motions. The solutions match with the higher-dimensional Reissner-Nordstroem metric on the boundary at r=ro. The features of the solutions are also discussed in the framework of higher-dimensional spacetime.     

信息系统工程监理及相关行业发展现状与分析

提出了影响监理行业发展的核心要素,即行业协会、行业规范及收费标准、从业者资格、行业业务技术研究等.参照这些核心要素的要求,总结并分析了通信工程监理、高速公路机电工程监理、建设工程中的弱电工程监理、设备监理及信息系统工程监理的基本情况.对目前存在的主要问题进行了探讨,评述了几种典型的监理形式的特点.重点分析了信息系统工程监理的现状与存在的问题,提出了一些针对性的建议.     

吴鹰:激情之鹰还是落寞英雄

时间:2006年10月 地点:北京 人物:吴鹰 所在公司简介:UT斯达康是专门从事现代通信领域前沿技术及产品研究、开发、生产及销售的国际化高科技通信公司,总部位于美国硅谷,共有多个研发中心分布在美国、中国、印度、韩国和加拿大,业务范围遍布全球.     

Berry phase in a generalized nonlinear two-level system

In this paper, we investigate the behaviour of the geometric phase of a more generalized nonlinear system composed of an effective two-level system interacting with a single-mode quantized cavity field. Both the field nonlinearity and the atom-field coupling nonlinearity are considered. We find that the geometric phase depends on whether the index k is an odd number or an even number in the resonant case. In addition, we also find that the geometric phase may be easily observed when the field nonlinearity is not considered. The fractional statistical phenomenon appears in this system if the strong nonlinear atom-field coupling is considered. We have also investigated the geometric phase of an effective two-level system interacting with a two-mode quantized cavity field.