短波信道上基于PSAM的OFDM系统信道估计技术

正交频分复用(OFDM)是已知的频谱利用率最高的一种通信系统,在短波通信中有很广泛的应用前景.通过研究短波信道上基于PSAM的OFDM系统信道估计的算法,进行了几种典型算法的仿真与比较.     

浙中西部内河航运建设发展问题的研究

通过现状调查和技术分析得出加快发展钱塘江中上游内河航运对浙中西部地区具有较好的经济效益和具大的社会效益,按照科学发展的要求,提出浙中西地区内河航运发展规划设想。     

我国城轨车辆制动系统介绍及选型

介绍了日本NABCO、德国KNORR和英国WESTINGHOUSE制动系统控制装置的组成、工作原理及在我国各地城轨车辆上的应用.提出了选用城轨车辆制动系统需注意的几个方面:在保证安全性的同时,尽量减少制动系统的运用.应考虑制动控制系统的寿命周期成本;在选用城轨制动控制系统时,需要研究其零部件维修的可能性,而不是自始至终从国外购买整机.     

Application of Chinese Characters in the Design and Construction of the Badaling Great Wall Station of the Beijing-Zhangjiakou High-Speed Railway北大核心CSCD

The new Badaling tunnel is the longest tunnel on the under-construction Beijing-Zhangjiakou highspeedrailway, with the Badaling Great Wall station to be built in the tunnel. This station, which is under the Badaling Great Wall historic site, is the world’s largest underground high-speed railway station with the most complicated structure and the largest overburden and excavation area. It is therefore a representative project for China’s highspeed railway development strategy, supporting infrastructure facilities for the Beijing Horticultural Expo 2019 and the 2022 Winter Olympics in Beijing, and it is important that it be of high quality and completed safely. In the de-sign and construction of the station, the glyphs of the Chinese characters of "中",”国”,”人”and”品”are used, re-spectively, along the station route, in the rescue and evacuation mode, auxiliary adit and partial excavation, which is a way to successfully integrate the art of Chinese characters into tunnel engineering. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

关于车辆维修中二系簧加垫的分析与计算

在车辆维修手册中规定,当车轮两次镟轮轮径值减少量超过一定限度以后,需要在二系簧下加垫片补偿,以保证车体高度。对广州地铁现有的4条线车辆该值进行分析与计算,并得出相应结论。     

Traffic assignment considering air quality

This paper presents a methodology of assigning traffic in a network with the consideration of air quality. Traffic assignment is formulated as an optimization problem considering travel cost and on-road emissions. It introduces a cell-based approach to model emission concentrations so that either the average or maximum emissions in a network can be considered in the optimization process. The emissions in a cell are modeled taking into consideration the influence of the emission sources from all cells in the network. A case study demonstrates that minimizing travel cost and reducing air pollutants may not be always achieved simultaneously. The traffic assignment procedure can effectively reduce emission concentrations at those locations with the worst air quality conditions, with only a marginal increase in travel time and average emission concentration in the network.     

集料毛体积相对密度测试方法研究

文章分析了粗集料试样烘干质量对于毛体积相对密度测试值以及沥青混合料最佳沥青用量的影响．并提出了测试方法的改进措施;分析采用吻合表观相对密度值的方法,以保证细集料毛体积相对密度测试结果的准确可靠。     

低噪声沥青混合料的水稳性研究

沥青路面水损害致使沥青的粘结力丧失、强度下降从而发生路面的破坏。该文通过分析水泥、石灰、抗剥落剂对提高混合料吸附作用的影响和水泥、石灰、抗剥落剂对提高沥青与集料粘附作用的影响和水泥、石灰合理剂量的确定和外掺剂的加入及其施工工艺研究,来研究OGFC-13混合料的水稳定性。     

浅谈基于“理实一体化”的汽车专业实训基地建设研究

在中国十二五规划当中,汽车工业被明确列为中国的支柱产业,中国汽车销售量已经连续四年位居世界第一,已经变成了汽车生产与消费的成果。为此,汽车未来的发展市场十分巨大。将汽车的维修与营销当作基础,才能为汽车后续的市场提供更多的商机。面对这样的市场,高职学院在培养汽车后市场人才方面发挥着十分重要的作用。文章应该将重点放在研究汽车专业人才培养的实训教育中,从而推动理实一体化实训基地建设的发展。     

基于MapInfo和MapX的导航电子地图实现

介绍基于Mapinfo制作我国某地电子地图的基本步骤和过程,采用在Visual C＋＋中集成MapX的方法对制作的某地电子地图进行二次开发,实现以地图为背景显示飞行参数、飞机计划航线和即时飞行信息等功能,完成导航电子地图的制作。