高速移动环境下的信道模型

对高速移动环境下的信道建模与测量活动进行了分类与总结,指出目前V2V信道建模与测量活动所存在的不足。首先对V2V信道建模的现状进行简单的介绍,给出信道冲击响应的一般表达式,论证信道建模的重要性;然后对目前国内外一些重要的信道建模与测量活动,特别是关于VTD对信道统计特性影响的测量活动进行了分类,将其按建模环境(几何的与非几何的)与环境中物体的分布(随机的与确定的)分为3个主要类型。最后,为了建立完善的信道模型,提出了未来信道建模所面临的挑战,为今后的信道建模与测量活动指引了方向。     

Road transport and climate change: Stepping off the greenhouse gas

Transport is Australia’s third largest and second fastest growing source of greenhouse gas (GHG) emissions. The road transport sector makes up 88% of total transport emissions and the projected emissions increase from 1990 to 2020 is 64%. Achieving prospective emission reduction targets will pose major challenges for the road transport sector. This paper investigates two targets for reducing Australian road transport greenhouse gas emissions, and what they might mean for the sector: emissions in 2020 being 20% below 2000 levels; and emissions in 2050 being 80% below 2000 levels. Six ways in which emissions might be reduced to achieve these targets are considered. The analysis suggests that major behavioural and technological changes will be required to deliver significant emission reductions, with very substantial reductions in vehicle emission intensity being absolutely vital to making major inroads in road transport GHG emissions.     

基于CADDS5-PIPING的舰船管系三维模型到二维出图技术的开发应用

文章概述了进行舰船管系三维模型到二维出图技术开发的目的、意义。针对CADDS5-P IP ING的特点和二维出图的需求,提出了解决问题的方法,达到了研发的目的。     

门锁控制器电瞬态传导抗扰试验与分析

为检测门锁控制器在沿电源线的电瞬态传导抗扰方面的能力,文章阐述了门锁控制器沿电源线的电瞬态传导抗扰测试平台的搭建和测试步骤,并对门锁控制器进行沿电源线的电瞬态传导抗扰试验,试验结果表明:施加骚扰脉冲1期间门锁控制器不能正常工作;施加骚扰脉冲1之后及施加骚扰脉冲2a,3a,3b期间及之后门锁控制器均能正常工作。通过对试验结果进行分析,并根据ISO7637-2:2004标准中评价准则对结果进行评价以及门锁控制器的工况判断其满足产品设计要求。     

Developing sustainable transport for the next generation: The need for a multi-sector approach

While some countries have made progress in encouraging more sustainable transport and travel patterns, there are limits as to how far this can be taken simply by looking at the decarbonisation of transport systems, since most travel is a derived demand and hence is strongly influenced by decisions taken by public and private sector agencies in different sectors. The paper first identifies some of the major non-transport sector influences on different aspects of travel behaviour. It then looks in more detail at changing patterns of grocery shopping over the last half century, and how these changes have been associated with new non-transport technologies and accompanying developments in business and social practices. Next, a simple visual spreadsheet tool is presented, that has been used by agencies to explore the main cross sector impacts (both positive and negative) of their major location and operating decisions. Finally, the paper proposes three ways in which cross sector synergies can be encouraged: (i) by giving each sector or major organisation responsibility for all CO₂ emissions associated with its activities, including those generated by the travel of its staff, customers, suppliers, etc.; (ii) by making major policy making within government a cross sector activity; and (iii) by developing a common, cross sector appraisal methodology for assessing the full range of impacts of policy proposals.     

P2结构混合动力系统协同控制

为了提高混合动力各系统的控制效率和响应性,针对P2结构混合动力系统控制对象的特点和整车的功能需求,提出了P2结构混合动力控制系统的构架和所有有效的工作模式,并从整车运行工况和模式转换效率的角度总结了所有有效的工作模式转换真值矩阵。为了满足各节点单元的协同控制要求,提出了P2混合动力控制系统的协同控制构架,约束了各控制单元的主要功能和接口定义,并对多个控制单元之间的复合控制过程进行描述。分析了2种不同动力源在液压控制的混合动力离合器的耦合过程以及混合动力离合器与换挡离合器控制过程重叠时所带来的动力迟滞,对离合器的压力控制和发动机的启动过程时序进行了优化。在不同的控制阶段定义了关键的控制目标,建立发动机扭矩、电机扭矩、混合动力离合器控制压力三者之间的关联。结果表明：发动机、电机、变速器之间通过HCU的协同控制方法能够高效地完成混动工作模式之间的转换。整车试验验证了各系统的系统控制效果,整个模式转换过程的时间为1.5 s,换挡品质和动力响应性满足驾驶需求。     

上海市轨道交通2号线系统总体建设目标的思考

上海市轨道交通2号线是规划网络中4条市域级快速线之一。通过对该线功能定位、线路走向、所经重要活动中心和对外交通枢纽、线路功能与作用、客流特征以及既有和在建工程技术特征等的分析和认识,提出了系统建设目标要求、技术对策、系统客运模式和系统功能目标特征。该线应分解为两个独立的运营系统:高速铁路客站(虹桥机场)以东区段利用既有2号线及其西延伸段,采用贯通运营方案;青浦段(朱家角至高速铁路客站)独立运营。     

谷胱甘肽对Cu~(2+)-H_2O_2导致关节软骨蛋白聚糖降解的影响

应用小牛关节软骨短期器官温育的方法,研究了谷胱甘肽(GSH)对Cu~(2+)-H_2O_2导致关节软骨蛋白聚糖(PG)降解的影响。结果表明:GSH能非常显著地抑制Cu(2+)-H_2O_2对软骨PG的降解作用,并呈剂量依赖型。用Sepharosc 6B柱层析分析软骨PG降解产物,发现GSH还能消除Cu~(2+)-H_2O_2导致的PG链的断裂,保护PG结构的完整。GSH对Cu~(2+)-H_2O_2的作用机理可能一方面与Cu~(2+)形成了复合物,另一方面使H_2O_2还原为H_2O,而消除了两者对软骨PG的降解作用。     

CD_4~( ) EFFECTOR CELLS DEFAULT TO THE TH2 PATHWAY IN INTERFERONγ-DEFICIENT

ＣＤ_４~（＋）ＥＦＦＥＣＴＯＲＣＥＬＬＳＤＥＦＡＵＬＴＴＯＴＨＥＴＨ２ＰＡＴＨＷＡＹＩＮＩＮＴＥＲＦＥＲＯＮγ－ＤＥＦＩＣＩＥＮＴＭＩＣＥＩＮＦＥＣＴＥＤＷＩＴＨ　ＬＥＩＳＨＭＡＮＩＡ　ＭＡＪＯＲＷａｎｇＺｈｉ＇ｅｎ；ＳｔｅｖｅｎＬ．Ｒｅｉｎｅｒ，Ｚ...     

汽车发动机空气滤清器的作用,选型,安装及使用

在对多种型号的发动机的改装中，通过对汽车发动机进行系统的配套设计，试验以及结合进口汽车发动机进气系统的结构的特点，在此基础上，介绍了汽车发动机空气滤清器的作用，空滤器的种类及特点进气阻力的测量，空滤器的选型依据以安装使用中应注意的问题。