The One World Trade Center tower being built in New York on the site of the twin towers destroyed on September 11, 2001, will measure 1,776 feet with its antenna spire. It is due for completion in 2013. 在2001年911事件发生的纽约双子塔原址上开工建设的世贸中心一号工程算上天线和尖顶有1776英尺,预计将于2013年完工。
Research of the Electric Effect for iron tower on VLF T-type Antenna 铁塔对T形面型天线电气性能影响的研究
Besides, key construction technologies are introduced in detail, such as machinery selection, tower installation, measurement, welding and antenna mast installation. 详细阐述机械选型、塔楼安装、测量技术、焊接技术和天线桅杆安装的施工工艺和关键技术。
Analysis of Effect of Launching Tower on Vertically Polarized Dipole Antenna Field 发射塔体对垂直极化偶极子天线场形的影响分析
The radio and television signal emission facilities, including antenna, feeder links, tower masts ( poles), ground network, satellite transmitting antenna as well as the auxiliary equipments thereof; 广播电视信号发射设施,包括天线、馈线、塔桅(杆)、地网、卫星发射天线及其附属设备等;
The Application of Mobile Communication Tower Mounted Booster and Elevated Antenna to Sea Coverage 移动通信塔放及高架天线在海域覆盖中的应用
The methods presented in this paper are adaptable to identify various kinds of restraints stiffness of tower foundations, such as high-rise structures, bridge towers, chimneys and antenna towers, as well as the condition of foundation soil and stiffness of covered structure underground. 本文研究的方法适用于识别包括高层建筑、桥墩和各种高耸建筑物的高耸工程结构基础约束刚度,以及地基土和地下隐蔽结构刚度的情况。
The Research of the Electric Performances of the Earthed Steel Tower Built near to a Medium Wave Transmitting Antenna 在中波广播发射天线近旁建接地铁塔对其电性能影响的研究
This paper gives a detailed introduction to the determination of the base price of the tower and the norm making of tower erection, tower foundation and the ground-based foundation of the antenna. 此文对铁塔基价的确定及铁塔架设、铁塔基础、天线地面基础的定额编制,进行了较为详细的介绍。
It focuses on the analysis to the various application environments of tower mounted booster. Based on the sea radio propagation empirical data recommended by CCIR, it explains the purpose of the Tx/ Rx antenna mounted height in sea area coverage. 重点分析了各类塔顶放大器的应用环境,并以CCIR推荐的海域无线电传播经验数据为基础,阐述海域覆盖中收发天线架设高度的作用。
Voltage between the shielding layer and the tower body, generated by potential distribution, might break down the antenna cable, and interrupt communications. 因电位分布而形成的屏蔽层与塔体之间的电压甚至可以击穿天线电缆,导致通信中断。
At last the built of valve tower time-varying topology antenna array model is researched fatherly, and the computing result is demonstrated. 最后进一步研究了换流阀塔时变拓扑天线阵模型的建立,并给出了计算结果。