两用型铁水车研制

介绍了两用型铁水车的技术参数、结构特点及其应用情况。     

信号过完备稀疏表示的唯一解及其边界条件

在探讨应用冗余字典寻找信号稀疏表示算法的基础上，简介信号过完备表示产生的背景和发展过程，认为信号表示的稀疏性与冗余字典的非相干性存在某种必然联系；结合正在进行的信号过完备稀疏表示理论与应用研究的专项课题，理论上讨论了满足基追踪算法和匹配追踪算法精确重构条件以及多个正变基级联字典的非相干系数与精确重构条件的某些研究进展，并提出对于非正交基联合而成的级联字典有待进一步研究的相关问题．     

城轨车辆车控制动控制方式与架控制动控制方式

介绍了城轨车辆车控制动控制方式与架控制动控制方式的结构和控制原理;分析了两种制动控制方式的特点;提出了两种方式制动系统的改进建议。     

上海轨道交通高架桥U形梁的技术特点

根据上海轨道交通应用U形梁的工程实践及相关试验研究,对U形梁设计的标准及特点进行了分析探讨。工程实践表明,U形梁结构是非常适合城市轨道交通的一种桥梁结构,能满足安全、实用、经济、美观、环保、耐久的结构设计目标。     

成都的城市景观——传统与未来

~~成都的城市景观——传统与未来@郑小明$成都市规划设计研究院!四川成都610015~~~~     

挤密砂桩加固软弱地基的承载性能研究

本文针对淮安地区高速公路软弱地基的工程实例,进行了砂桩复合地基承载性能的理论计算分析,并将理论计算结果与实测结果进行对比,两者结果基本一致。同时从复合地基理论与砂桩单桩承载力计算理论的角度分析影响复合地基承载力的影响因素。     

Ontologies for transportation research: A survey

Transportation research relies heavily on a variety of data. From sensors to surveys, data supports day-to-day operations as well as long-term planning and decision-making. The challenges that arise due to the volume and variety of data that are found in transportation research can be effectively addressed by ontologies. This opportunity has already been recognized – there are a number of existing transportation ontologies, however the relationship between them is unclear. The goal of this work is to provide an overview of the opportunities for ontologies in transportation research and operation, and to present a survey of existing transportation ontologies to serve two purposes: (1) to provide a resource for the transportation research community to aid in understanding (and potentially selecting between) existing transportation ontologies; and (2) to identify future work for the development of transportation ontologies, by identifying areas that may be lacking.     

基于复杂网络的我国高铁演化特征研究

为深入认识我国高铁网络演化的拓扑特性和规律，将高铁站点所在城市抽象成网络节点， 将高铁线路抽象成网络的边，运用复杂网络理论对我国2003—2015 年高铁网络演化特征进行分 析。研究发现：我国高铁网络密度不断提升，但依然存在东、中、西部节点城市被割裂，整体网 络密度偏低的现象；网络中介中心势不断增强，一些关键节点（比如：武汉、郑州） 具有较大的 网络控制权，不均衡性逐渐扩大；网络发展后期呈现出小世界特性。因此，提出如下建议：加快 西部地区网络规模和城市网络地位建设；提升网络均质性，弱化关键节点控制力；选择性地建设 关键中、东部和西部城市之间的长线路，提升整体网络性能。     

Simulating ad-hoc demand-responsive transportation: a comparison of three approaches

Transport models are used to evaluate new infrastructure and public transport services, varied levels of demand, and new ideas for demand management. Exploring these proposals virtually is easier than implementation and testing in situ. However, existing models are based around traditional forms of transportation. As part of a feature analysis using a case study approach, three different simulation packages (a simple custom-developed package, traffic microsimulation, and agent-based simulation) are used to develop and demonstrate simulations of demand-responsive transportation (DRT) and analyze the advantages and disadvantages of each simulation approach for evaluating DRT. While the simulations display some relational replication (meaning they produce similar relational patterns with respect to certain variables), they do not show distributional replication (that is, the value of the results is not statistically similar), meaning that under- or over-estimation of predicted travel could occur. Recommendations for the application of each modeling approach are made.     

一种基于广义S变换增强的柴油机失火故障特征提取方法

为有效提取柴油机缸盖振动信号失火故障特征,提出一种基于广义S变换增强的柴油机失火故障特征提取方法。首先根据柴油机燃烧过程与配气相位的关系对信号进行等角度重采样,然后利用广义S变换对信号进行消噪处理,并按工作循环将信号的周期性瞬态特征进行同步增强。通过仿真信号验证和某柴油机缸盖振动信号的实例应用,结果表明,此方法能有效地提取柴油机缸盖振动信号的失火故障特征,实现失火故障的准确诊断。