多样化终端让用户体验“多媒体”奥运

历届奥运会都是新技术和新应用的展示舞台，多角度、全方位的奥运移动信息化平台将使信息传送达到前所未有的高速度。用户通过多样化的终端和各种多媒体业务体验奥运已成为此次北京奥运会的一大亮点。     

Fiberings with Fiber RP（κ）

Let κ be non-negative integer. The unoriented bordism classes, which can be represented as [RP（ξ^κ）] where ξ^κ is a k-plane bundle, form an ideal of the unoriented bordism ring MO.. A group of generators of this ideal expressed by a base of MO. and a necessary and sufficient condition for a bordism class to belong to this ideal are given.     

Instructions to Authors

General COMMUNICATIONS IN THEORETICAL PHYSICS is published monthly by the Chinese Physical Society through the Institute of Theoretical Physics, the Chinese Academy of Sciences. Articles in this journal are abstracted/indexed in Science Citation Index （SCI）, Science Citation Index Expanded （also known as SciSearch）, ISI Alerting Services, and Current Contents/Physical, Chemical and Earth Sciences;     

中立型脉冲微分方程正解的存在性

本文利用Banach压缩映射原理，讨论了中立型时滞脉冲微分方程正解的存在性。     

电子政务与政府管理模式弹性化

传统政府管理模式的刚性特征比较突出,主要体现在政府组织的永久性相当强,管理的适应性差,政府管理效率低下。而信息通信技术的发展和电子政务的推行,改变了传统政府管理模式的这些特点,促使其向弹性化发展。我们认为,信息时代政府运     

成都七成农村接入宽带

据成都市信息化办公室统计,截至目前,成都市共开通1690个行政村的宽带接入,宽带村通率达71%,建成500多个农村便民信息服务中心和信息服务工作站。宽带入村既推动了农村居民改善生活生产方式的进程,促进农民增收致富,也有利于建立和完     

iSuppli:信息有价--访美国著名市场咨询公司iSuppli

作为一个市场咨询公司，它存在的价值何在?它在整个行业链条中起到什么样的作用?它的运作模式是怎样的?市场前景又如何呢?所有这些疑问在我采访了美国著名市场咨询公司iSuppli的两位高层领导人一副总裁Paul Semenza和中国业务总监Joe Abelson-之后，有了明晰的答案。     

新加坡政府信息化的发展情况

新加坡是人们向往的旅游度假胜地,更是全球信息产业最发达的地区之一。新加坡信息通信2005年的收入达到378．9亿新币。全球财富1000强中超过90%的科技企业将新加坡作为其全球网络中的重要枢纽,从企业总部到研发机构,从生产活动到系统实施,这些企业在当地的运作涵盖了整个价值链。诸多全球企业巨头登陆新加坡,证明     

A Quasi-Symmetric Coupled Quantum Well and Its Electric-Optical Properties

We propose a novel coupled quantum well structure, i.e. a quasi-symmetric coupled quantum well (QSCQW). Based on the demands of optical switching devices for quantum well materials, the QSCQW configuration is further optimized. Consequently, in the case of low applied electric field 25kV/cm and low absorption loss 100cm^-1, a large field-induced refractive index change (for TE mode, n = 0.0106; for TM mode, n = 0.0115) is obtained in the QSCQW structure at the operation wavelength 1550hm. The value is in one or two order of magnitude larger than that in a rectangular quantum well and about 50% larger than that of five-step asymmetric coupled quantum well structure under the same working conditions. The refractive index change obtained with the optimized QSCQW under so low absorption loss and applied electric field is very attractive for semiconductor optical switching devices. This manifests that the QSCQW structure has a great potential for applications in ultra-fast and low-voltage optical switches and in travelling wave modulators.     

Existence, Multiplicity and Infinite Solvability of Positive Solutions for One-Dimensional p-Laplacian

The existence, multiplicity and infinite solvability of positive solutions are established for some two-point boundary value problems of one-dimensional p-Laplacian. In this paper, by multiplicity we mean the existence of m solutions, where m is an arbitrary natural number.