"叠加均值法"在沈本高速公路施工中的应用

主要介绍了在高速公路建设中,利用叠加均值法来解决路槽平整度这个较为复杂的问题。这种方法不仅简单实用,操作方便,节约大量的测量工作,而且可以加快施工进度,保证路槽的施工质量。     

天津地铁人文化设计研究

本文通过对天津城市现状以及天津地铁现状分析,阐述了地铁文化与城市文化结合的重要意义,即良好的地铁文化可以延伸和提升城市文化,提出一些地铁人文化设计思路.在天津地铁人文化环境的打造过程中,要充分突出天津人文地域特点,展示天津悠久的历史;增加环境艺术性设计,带给市民艺术感受;以及突出社会公益文化打造,营造和谐社会,充分展示天津城市形象.合理利用城市文化艺术资源,充分发掘天津地铁文化,拓展地铁文化的延伸方向.     

港口项目综合质量模糊评价

根据港口项目的特点,以广州南沙某港口项目为例,在大量调研的基础上,分析港口项目综合质量的评价指标,运用模糊数学的方法建立港口项目模糊综合评价体系.     

Impact of channel estimation error on channel capacity of multiple input multiple output system

In order to investigate the impact of channel estimation error on channel capacity of multiple input multiple output （MIMO） system, a novel method is proposed to explore the channel capacity in correlated Rayleigh fading environment. A system model is constructed based on the channel estimation error at receiver side. Using the properties of Wishart distribution, the lower bound of the channel capacity is derived when the MIMO channel is of full rank. Then a method is proposed to select the optimum set of transmit antennas based on the lower bound of the mean channel capacity. The novel method can be easily implemented with low computational complexity. The simulation results show that the channel capacity of MIMO system is sensitive to channel estimation error, and is maximized when the signal-to- noise ratio increases to a certain point. Proper selection of transmit antennas can increase the channel capacity of MIMO system by about 1 bit/s in a flat fading environment with deficient rank of channel matrix.     

展望我国港口航运业的未来发展

文中分析和展望了当前我国国内港口航运业所面临的形势和未来的发展方向,提出了交通运输主管部门可采取的措施。     

Finite Element Analysis for Multi-pass Equal Channel Angular Pressing

Equal channel angular pressing (ECAP) is an attractive process method to produce bulk ultra-fine grained materials. There are many experiment evidences showing that the nature of the microstructural evolution in multi-pass ECAP depends on process routes. Isothermal three dimensional FEM simulations for multi-pass ECAP were performed using DEFORM3D finite element code. The material model of 6061Al-T6 was employed. Flow nets, effective strain distribution in the workpiece and loads during multi-pass ECAP using different routes were analysed respectively. The simulations show process routes influence material flow and effective strain distribution in the workpiece obviously but have few influence on loads.     

An Adaptive Joint Source/Channel Coding Using Error Correcting Arithmetic Codes

An approximately optimal adaptive arithmetic coding (AC) system using a forbidden symbol (FS) over noisy channels was proposed which allows one to jointly and adaptively design the source decoding and channel correcting in a single process, with superior performance compared with traditional separated techniques. The concept of adaptiveness is applied not only to the source model but also to the amount of coding redundancy. In addition, an improved branch metric computing algorithm and a faster sequential searching algorithm compared with the system proposed by Grangetto were proposed. The proposed system is tested in the case of image transmission over the AWGN channel, and compared with traditional separated system in terms of packet error rate and complexity. Both hard and soft decoding were taken into account.     

长江口深水航道疏浚吹填一体化施工工艺

针对长江口地区近年来出现的新圈围造地工程,因条件限制或成本控制不宜设置储泥坑的情况,通过长兴潜堤工程实例,介绍长江口深水航道疏浚吹填一体化施工工艺,对工艺中的疏浚施工、艏吹抛锚定位以及吹泥施工等关键技术进行重点阐述。该工艺无需设置中转储泥坑,疏浚土一次性吹填上岸,并用于造地成陆,在长江口地区应用效果较好。     

浅谈高速公路隧道监控系统中的可编程控制器

简要介绍了高速公路隧道监控系统中的可编程控制器的基础知识、基本组成及特点,并着重分析了可编程控制器网络的四大要素即网络拓扑结构、通信介质、介质访问控制以及通道利用方式。     

关于高速公路绿色通道车辆快速检查方案的探讨

根据国家相关政策规定,整车（达到该货车核定载重量或装载容量在80%以上的按整车计算）并合法装载鲜活农产品的车辆,经过＂绿色通道＂可免收通行费.该项政策实行以来,少数不法运输车辆利用＂绿色通道＂的免费政策,通过掩盖等手段逃避依法应缴纳的规费,扰乱了社会正常的运输市场,破坏了运输市场的公平性.因此,研发绿色通道车辆快速有效的检查系统就成为当前一项十分紧迫的任务.