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1861.多次反射继电器的应用以增强机场移动航空通信系统网络的性能
[铁路、船舶、航空航天和其他运输设备制造业,信息传输、软件和信息技术服务业] [2014-04-01]
The proposed technology, known as AeroMACS, will be used to support fixed and mobile ground to ground applications and services. This article proposes and demonstrates that IEEE 802.16j-amendment-based WiMAX is most feasible for AeroMACS applications. This amendment introduces multihop relay as an optional deployment that may be used to provide additional coverage and/or enhance the capacity of the network. Particular airport surface radio coverage situations for which IEEE 802.16-2009-WiMAX provides resolutions that are inefficient, costly, or excessively power consuming are discussed. Our initial simulation results suggest that no additional interference to MSS feeder link is caused by deployment of IEEE 802.16j-based AeroMACS.
关键词：通信；通信网络；C波段；电信
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1862.双频(无线电/光学)航天器通信的并行系统工程和风险降低
[信息传输、软件和信息技术服务业,计算机、通信和其他电子设备制造业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-31]
This paper describes a system engineering approach to examining the potential for combining elements of a deep-space RF and optical communications payload, for the purpose of reducing the size, weight and power burden on the spacecraft and the mission. Figures of merit and analytical methodologies are discussed to conduct trade studies, and several potential technology integration strategies are presented. Finally, the NASA Integrated Radio and Optical Communications (iROC) project is described, which directly addresses the combined RF and optical approach.
关键词：通信；航天器通信；无线电通信；光学通信；并行工程
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1863.月球通信卫星和服务器的设计和实现以应对2012年SISO攻击波
[计算机、通信和其他电子设备制造业,铁路、船舶、航空航天和其他运输设备制造业,信息传输、软件和信息技术服务业] [2014-03-31]
Last year, the Simulation Interoperability Standards Organization (SISO) inaugurated the now annual High Level Architecture (HLA) Smackdown at the Spring Simulation Interoperability Workshop (SIW). A primary objective of the Smackdown event is to provide college students with hands-on experience in the High Level Architecture (HLA). The University of Alabama in Huntsville (UAHuntsville) fielded teams in 2011 and 2012.This paper concentrates on the first two federates by describing the functions, algorithms, the modular FOM, experiences, lessons learned and recommendations for future Smackdown events.
关键词：通信；互操作性；通信卫星；月球卫星；算法设计；无线电通信；客户服务器
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1864.全球卫星市场报告（2014-2018年）
[计算机、通信和其他电子设备制造业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-26]
A satellite is an artificial object that is placed in orbit around the earth or other planets for telecommunication purposes. Satellites are used in providing various services and products such as broadcast, trunking or VSAT services, broadband internet access, mobile voice, data, and TV services, and more recently satellite radio. The adoption of satellite technology is high in developed countries owing to the large demand for digital content. However, demand from developing countries is catching up with global demand. The Global Satellite market is expected to witness moderate growth with a CAGR of 8.05 percent during the period 2013-2018. In 2013, the Americas dominated the market , followed by the EMEA and APAC regions. The current demand for satellites is mainly for defense applications, but it is expected that the demand from the commercial sector will grow over the next few years.
关键词：卫星；环绕地球轨道；人造物体；通信
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1865.全球直升机市场报告（2014-2018年）
[铁路、船舶、航空航天和其他运输设备制造业] [2014-03-24]
Helicopters have a significant role in the modern day aircraft fleets and these are used in a wide range of applications across various industries. One of the major reasons for the increasing demand for helicopters is their unique features such as vertical take-off and landing, and the ability to hover, and fly forward, backward, and lateral. The Civil Aviation sector and Defense sector are the major end-users of helicopters. In 2013, the Defense sector contributed the major revenue to the market.
关键词：直升机；独特功能；垂直起飞；着陆；能力盘旋
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1866.结构2012，交通研究记录：第2313号美国交通研究会报告
[铁路、船舶、航空航天和其他运输设备制造业,建筑业] [2014-03-21]
The report discusses 21 papers on topics including general structures; steel bridges; concrete bridges; field testing and nondestructive evaluation of transportation structures; tunnels and underground structures; culverts and hydraulic structures; structural fiber-reinforced polymers; and critical transportation infrastructure protection.
关键词：钢铁；桥梁；结构分析；性能评估；无损检测；钢筋混凝土
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1867.铁路桥梁护栏腐蚀的检测和量化的可行性研究
[铁路、船舶、航空航天和其他运输设备制造业,黑色金属冶炼和压延加工业,建筑业] [2014-03-21]
The Center for Nondestructive Evaluation at Iowa State University has experience in development of measurement techniques and new sensors using a variety of interrogating energies. This research evaluated feasibility of three technologies—x-ray radiation, groundpenetrating radar (GPR), and magnetic flux leakage (MFL)—for detection and quantification of corrosion of embedded reinforcing steel.The methods provide useful and complementary information. GPR provides a rapid approach to identify reinforcing steel that has anomalous responses. MFL provides similar detection responses but could be optimized to provide more quantitative correlation to actual condition. Full implementation could use either GPR or MFL methods to identify areas of concern, followed by radiography to give a visual image of the actual condition, providing the final guidance for maintenance actions.
关键词：钢铁；桥面板；缓蚀剂；钢筋混凝土；无损测验；路面罩面；桥梁护栏
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1868.新型汞合金在太空零件制造中的应用
[金属制品业,铁路、船舶、航空航天和其他运输设备制造业,黑色金属冶炼和压延加工业] [2014-03-21]
Sound amalgams can be fabricated by substituting Ga-In liquid for mercury; Cu-coated steel fibers bond well with the amalgam components. Inclusion of steel fibers significantly improved mechanical properties. An application scenario utilizing amalgams for in-space parts fabrication and repair was suggested. Procedure and materials need to be optimized.
关键词：钢铁；汞中毒；汞；金属纤维；机械性能
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1869.结构2012，交通研究记录：第2268号美国交通研究会报告
[建筑业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-21]
This document consists of 14 papers that explore construction road user costs in rural areas, value of tablet computers in transportation construction inspection, benefits of three- and four-dimensional computer-aided design models, comparison of public-private partnerships and traditional procurement methods, construction manager-general contractor delivered projects, and volumetric and mechanistic test variability on predicted performance of asphalt pavement.
关键词：钢铁；高速公路桥；沥青混凝土路面；项目管理；农村地区；热拌沥青混凝土
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1870.浅谈我国现代铁路通信技术的应用和发展
[信息传输、软件和信息技术服务业,铁路、船舶、航空航天和其他运输设备制造业] [2014-03-19]
随着科技的不断发展和计算机网络技术的革新，现代化的通信技术和手段已经能够很好的克服时间和空间的限制，使得沟通不再受到距离的影响。现代化通信技术在我国铁路中也得到了广泛应用，使得列车上的旅客能更快捷的与外界进行信息交流，为满足铁路列车高速化发展的需求，建立完善的铁路通信系统加强现代通信技术在我国铁路中的应用，能够有效确保列车的安全。本文对现代通信技术在我国铁路中的应用进行了简要的分析，并对通信信号一体化技术的基本特点和我国现代铁路通信技术的发展趋势进行了概括。
关键词：计算机网络技术；通信技术；铁路；通信网络
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