纽特钻宝进军中国卫星通信市场

项目编号:GLZFCG2005A0006 项目名称:广播电视器材招标公告(3.31) 所属行业:通信设备-社会公共安全设备及器械发布日期:2005-03-31 标讯内容: 一、投标人资格:国内注册(指按国家有关规定要求注册的)生产或经营本次招标采购货物的供应商。二、招标项目名称及内容: 项目名称:村村通广播电视器材采购     

中国移动启动2013年4G招标

本刊讯中国移动近日正式启动了4G网络设备的招标,此次集中采购涉及全国31个省市,采购规模约为20.7万个基站,共计55万载扇。中国邮电器材公司成为此次招标的代理机构,招标结果将于7月15日在北京公布。业内估算,中国移动此次招标的整体规模将达到200亿元左右。中国移动高层多次表示,计划在今年建成20万个4G基站,如果实现这一目标,中国将超越美国和日本,成为全球最大的4G网络设备市场。     

PBN中标歌华有线HFC1310nm机房系统设备采购项目

随着北京数字电视大规模平移改造，北京歌华有线电视网络股份有限公司于2008年3月3日对于HFC1310nm机房系统设备采购项目进行招标。PBN公司凭借设备的专业性、极高的性价比、完善的售后服务、完整的网络管理解决方案，独家中标该项目。     

PBN 独家中标 歌华有线HFC1310nm机房系统设备采购项目

随着北京数字电视大规模平移改造，北京歌华有线电视网络股份有限公司于2008年3月3日对于HFC1310nm机房系统设备采购项目进行招标：PBN公司凭借设备的专业性、极高的性价比、完善的售后服务、完整的网络管理解决方案．独家中标该项目。成为这张覆盖北京地区四大机房骨干传输网络的唯一HFC1310nm机房系统设备供货商。     

亨通光电成功中标移动、广电项目

近日,从江苏亨通光电股份有限公司商务部传来喜讯,在中国移动广东公司2009手二级集采光缆询价项目货物采购设备招标中、在中国移动通信集团广西有限公司光缆供货采购设备招标中、在珠海市广播电视网络公司2009年度光缆年度供货采购设备招标中,亨通光电（SN．600487）以雄厚的实力一举中标。     

HFC双向网光设备的技术要求及测试

对双向网络中使用的设备不能仅凭经验和简单的指标测试，应将具体的要求纳入采购检测中，逐批抽查以保证设备的质量。网络器材种类众多，其中光设备是双向网络中的主要设备，本文主要总结了今年来对设备的招标及使用情况，以光工作站为例，简单介绍了设备的要求及主要参数的测试。     

设备采购的招标与谈判方法

<中华人民共和国政府采购法>第三章第二十六条明确规定政府采购可以采用公开招标、邀请招标、竞争性谈判、单一来源采购、询价等方式,广州市电视台的设备采购主要采用招标与谈判相结合的方式.     

联通再集采46.9万FDD基站王晓初能否“拯救”联通?

春节前夕,中国联通相关招标官网宣布启动LTE FDD三期工程无线主设备集中采购项目.本期采购规模为46.9万站,涉及全国334个城市.其中,106个招标城市采购规模为16.7万站;228个扩容城市采购规模为30.2万站. 中国联通此次采购规模十分巨大,预计将带来超过200亿元人民币的市场(不包括各种配套、建设成本),给电信设备厂商巨大“新年利是”.     

中国电信启动2014年PON设备集采

中国电信近日启动了2014年PON设备集中采购项目。本次集采招标范围包括EPON设备标包、GPON设备标包、10GEPON设备标包等3类标包。从招标产品可以看出，EPON设备仍占主要地位，10GPON采购量则大幅缩水。本次采购相比2013年总规模有所下降，     

TD三期招标：花开8家，各表几枝？

3月16日中国移动发出7TD网络三期无线网设备采购招标公告,标志着中国移动TD--期招标的正式启动。根据此次中国移动三期的招标文件,本次TD无线网设备招标涉及佛山、无锡、温州等200个城市,采购规模约为3．9万个无线基站,约26万无线载扇,是二期规模的1．6倍。记者日前采访了一些业内人士,对TD三期招标关键词进行了解读。     

智能通信在楼宇自控系统中的应用

随着计算机技术、控制技术、通信技术及信息技术的飞速发展,人们对生活、办公环境安全性、舒适性的要求日渐增长,智能建筑应运而生。楼宇自动化控制系统是智能建筑的一个重要组成部分。通过结合具体的智能楼宇控制工程项目,在介绍系统概况的基础上,给出了系统的总体设计方案及子系统的监控方案,具有一定的实用价值。     

Advances in millimeter-wave subsystems in Japan

The authors describe the development trends and results of millimeter-wave systems in Japan in such fields as communication, radar, and measurement systems. The applications included are the W-40G waveguide transmission communication system, an automobile traffic control system using the 60-GHz band, a collision avoidance radar system for an automobile, a plasma electron density measuring system, and satellite communication. The authors describe the development of devices such as high-power FET amplifiers, traveling wave tube amplifiers (TWTAs), IMPATT amplifiers, low-noise amplifiers, and monolithic microwave integrated circuit (MMIC) devices used in constructing the millimeter-wave systems     

Progress in electrophotography in Western Europe

A review is given of the progress in electrophotographic science and technology in Western Europe during the years 1967 to early 1971. University research work is mainly directed towards two areas: 1) the electrical and physical properties of photoconductors, such as selenium, chalcogenides, oxides, and organic materials; and 2) the sensitization of these photoconductors. Industrial research teams report on the preparation of electrophotographic layers on development and on image evaluation. A bibliography including scientific papers and patents published on this subject during said period completes this review.     

Two-wave mixing in reflection holograms in photorefractivematerials

The intensity and phase of two counterpropagating optical beams in a photorefractive material are investigated both numerically and by using an approximate analytical theory. It is shown that in the reflection regime they are two situations where coupling between the beams may be spatially dependent; in the case of nearly degenerate two-wave mixing, and when a photocurrent is present. In these situations, previously obtained results may need significant correction     

Propagation in Broadside-Coupled Suspended-Substrate Stripline in E-Plane

The spectral-domain analysis is applied to the derivation of the propagation characteristics of the even and odd mode, for the broad-sidecoupled suspended-substrate stripline (BCSSS). The characteristic impedance, based on the current-power definition, as well as the effective permittivity are evaluated. Numerical results are presented illustrating the effects of several different dimensional parameters. Numerical results indicate a large spread between even- and odd-mode impedance for thin substrates (D/A < 0.045) and stripwidths ranging 0.046<= W/B<= 0.47, suggesting tight coupling. Negligible frequency dependence on odd-mode impedance is evident, as well as significant frequency effects on even-mode impedance. Considerable dispersion is shown to be present in the odd mode for wider strips. Measured results for a low-pass filter and cascaded transitions are presented.     

Autosolitons in InSb in a magnetic field

It is shown experimentally that a longitudinal magnetic field of comparatively small magnitude substantially changes the velocity of autosolitons in indium antimonide samples and produces an appreciable redistribution of the electric field of these autosolitons. In this case, the frequency and amplitude of the current oscillations in the external circuit of the sample increases or decreases, depending on the direction of the longitudinal magnetic field. Fiz. Tekh. Poluprovodn. 32, 697–700 (June 1998) An erratum to this article is available at .     

Errors in reprojection methods in computenzed tomography

Iterative tomographic reconstruction methods have been developed which can enforce various physical constraints on the reconstructed image. An integral part of most of these methods is the repro. jection of the reconstructed image. These estimated projections are compared to the original projection data and modified according to some criteria based on a priori constraints. In this paper, the errors generated by such reprojection schemes are investigated. Bounds for these errors are derived under simple signal energy assumptions and using probabilistic assumptions on the distribution of discontinuities. These bounds can be used in the enforcement of constraints, in the determination of convergence of the iterative methods, and in the detection of artifacts.     

中国数字电视的发展现状:前景明朗现状不乐观

在计算机和移动电话给人们带来全新的数字体验以后,数字电视开始引领传统家电的数字革命,在拥有最多的电视用户的中国,这场革命刚刚开始.我国计划分2005年、2008年、2010年和2015年四个步骤来实现由模拟电视向数字电视的过渡,到2015年在国内将全面停止播放模拟电视节目.目前在3.85亿个家庭里拥有4亿台彩电,因此在今后10年内这些彩电肯定要更换成数字电视或安装机顶盒,所以我国今后将从一个巨大的模拟电视机市场转变成海量的的数字电视市场.     

移动产业2011年五大趋势:Google苹果双头垄断

新年伊始,移动产业的各种预测层出不穷,《今日美国报》专栏作家凯文·马尼(Kevin Maney)撰文,列举了2011年移动行业的五大趋势。以下为文章全文:2011年的移动行业有一些显而易见的趋势:Verizon可能会出售与其网络兼容的iPhone,苹果可能会发布新iPad,而用户则仍然有可能浪费大量时间玩《水果忍者》(Fruit Ninja)这样的游戏。