城市轨道交通超级电容储能装置控制策略

以城市轨道交通地面式超级电容储能装置为背景,针对空载电压波动下的储能装置阈值选择问题进行探讨,首先分析城轨供电系统中空载电压波动对再生能量回收的影响:1)更改储能装置放电电压指令,可以改变储能装置和整流机组能量输出的功率比例;2)传统恒定阈值放电策略将放电指令与放电阈值固定,因此储能装置放电时不能做到对放电功率的控制;3)采用固定阈值放电策略时,空载电压值的变化会影响储能装置放电输出能量的大小。然后提出充放电阈值动态调整控制策略,实验结果表明,对于不同的空载电压,改进后的控制策略可以根据空载电压放电指令进行动态调整,使储能装置与整流机组的能量输出比例恒定,从而维持放电时放出的能量不随空载电压的波动而变化。     

宜万铁路复杂岩溶隧道施工地质预报特色

研究目的:宜万铁路地质异常复杂,被誉为修建铁路的"禁区",隧道工程存在巨大地质风险。重大隧道工程主体深埋于山体内腹,而目前勘察的技术手段只能探及浅部,难以涉及深部,完全查清隧道深部复杂的地质问题,的确很难(国内外皆如此),隧道建设始终存在"地面勘察难以探明深部,而隧道深部施工安全、工程处理又要求尽量探明"这一对矛盾。为解决这对矛盾,只能在前期勘察的基础上,强化隧道施工地质工作,实施施工地质预报。研究结论:研究创新了"隧道地质复杂程度分级",实现"隧道施工地质预报设计"并纳入规范管理,为隧道施工保驾护航,取得显著效果,使施工地质预报工作迈上新台阶。     

北京轨道交通衔接理念及设施设置原则

论述轨道交通综合效益的充分发挥,离不开其他交通方式的合理衔接.从分析国外交通衔接经验入手,结合我国的交通特点和北京的交通衔接实践,总结提炼出交通衔接特性及理念.在此基础上,结合北京的城市和交通特征、轨道交通网络特点、各衔接方式的功能定位,提出分年限、分区域、分优先级的衔接设施设置原则,为各条线路的具体衔接规划提供参考依据.     

中耳炎“三段论”分类法的理论和临床研究

研究并提出新的、更科学和更实用的“三段论”中耳炎分类法。方法　复习当代国内外现行的中耳炎分类法 ,分析研究其主要特点和缺陷 ;研究近年与中耳炎分类相关的病理研究新进展 ,提出新的分类法并应用于临床诊治。结果　国内外现行的中耳炎分类法均以临床外显性征象作为分类的主要标准 ,这些征象不能很好地反映中耳腔关键区域重要解剖结构的病变现状和功能受损程度。新提出的“三段论”中耳炎分类法 ,经 1160例中耳炎临床试用 ,其诊断准确率达 82 .4%～ 98.4%。结论　“三段论”中耳炎分类法以当今病理研究成就为科学依据 ,简单实用 ,对中耳炎临床诊治有很好的指导作用     

基于中文网页的综合联系信息提取系统的设计与实现

为满足用户希望通过搜索引擎查询综合联系信息的需求,设计了基于中文网页中的综合联系信息提取系统。研究与阐述了在搜索引擎返回结果的基础上提取有关联系方面的综合信息(例如邮箱、电话等)的实现方法,并通过构建特有的内置"实体"判断、SV值算法提高系统的提取精度。     

Measuring the influence of bus service quality on the perception of users

Encouraging the use of public transport is a key policy goal in many countries. Therefore, public transport should offer the level of quality that accommodates the demands of current users, and importantly, the desires of potential users. This study investigates the influence of the perceived quality of bus service on the perception of both current and potential users. The study draws upon data from 512 questionnaires distributed across Belfast City in the UK. The study utilises a binary logistic regression model to quantify the relationships between the perceived quality of 29 bus indicators (independent) and the perceptions of users towards the overall bus service (dependent). Eleven significant indicators are reported to have significant influence on the perception of users. These indicators are utilised to propose scenarios for optimising the quality of bus service with the perceptions of current and potential users.     

Differences in single heavy vehicle crashes at intersections and midblocks

The objective of this research is to identify the factors differentiating between single heavy vehicle collisions at intersections and midblocks by using a binary logit model. Our results show that single vehicle crashes involving heavy vehicle at intersections are more likely to occur on main roads and highways, whereas crashes at midblocks are more likely to occur on divided two‐way roads, roads with special facilities or features (e.g. bridge) and roads with a higher percentage of heavy vehicle traffic. Intersection crashes are also more likely to involve vehicles that are turning left or right, resulting in angle crashes and vehicle overturn, whereas midblock crashes are more likely to involve vehicles on higher posted speed roads. Copyright © 2017 John Wiley & Sons, Ltd.     

Comparison of advanced imputation algorithms for detection of transportation mode and activity episode using GPS data

Global Positioning System (GPS) technologies have been increasingly considered as an alternative to traditional travel survey methods to collect activity-travel data. Algorithms applied to extract activity-travel patterns vary from informal ad-hoc decision rules to advanced machine learning methods and have different accuracy. This paper systematically compares the relative performance of different algorithms for the detection of transportation modes and activity episodes. In particular, naive Bayesian, Bayesian network, logistic regression, multilayer perceptron, support vector machine, decision table, and C4.5 algorithms are selected and compared for the same data according to their overall error rates and hit ratios. Results show that the Bayesian network has a better performance than the other algorithms in terms of the percentage correctly identified instances and Kappa values for both the training data and test data, in the sense that the Bayesian network is relatively efficient and generalizable in the context of GPS data imputation.     

缓速器的分类及其在商用汽车上的应用

探讨缓速器在商用汽车上应用的必要性以及目前使用的各种缓速器的分类及其特点。     

交通需求管理措施及实施效果的调查研究

交通需求管理提供了解决交通问题的方法,可为经济、社会以及环境带来一定的收益,但不同城市和地区的交通问题有所不同,必须根据各自城市的实际特点制定出切实可行的具体方法,交通需求管理才能成为解决城市交通问题的有效手段。