京杭运河穿黄及黄河北航道走向探析

近年来,京杭运河黄河以北段复航呼声越来越高,京杭运河穿黄及黄河北山东段走向成为目前需要迫切解决的问题。本文通过对东平湖周边防洪工程现状分析,提出了穿黄位置、穿黄方案及穿黄线路走向;根据黄河北河系水网布置,提出了京杭运河黄河北山东段航道初步走向,为京杭运河黄河以北段复航工程提供技术参考。     

Exploring the issue of integrating logistics and traffic control in urban areas

This paper proposes an optimization framework for urban transportation networks’ (re-)design which explicitly takes into account the specific decision-making processes of ordinary users and logistic operators. Ordinary users are typically commuters whose travels consist of well-defined pairs of origin and destination points, while logistic operators make deliveries at multiple locations. Obviously, these two user classes have different objectives and scopes of action. These differences are seldom considered in traffic research since most models aggregate the flow demand in OD matrices and use assignment models to predict the response of all users as if the dynamics of their optimization processes were of the same nature. This work demonstrates that better results can be achieved if the particular features of each user class are included in the models. It potentially improves the estimation of the responses and allows managers to shape their control measures to address specific user needs.     

城市道路网可行性研究中CIVIL 3D应用浅谈

以武汉航空企业总部区域市政配套工程(四期)为例,采用AutoCAD Civil 3D计算道路和场地土石方,并与传统设计软件EICAD进行了比较。对Civil 3D的运用进行了简单的探索。     

浅谈市政工程中小桥设计问题

随着我国城市化建设的快速发展,越来越多的城市高架桥梁、轨道交通、下穿隧道等市政交通项目应运而生,而这些新增交通项目与现状地面道路、河道以及市政管线等构筑物的空间冲突,导致城市中小桥梁建设的形式也越来越丰富。如何合理地解决市政工程中小桥设计中遇到的问题,结合工程设计实例提了几点相应的解决思路。从造价、经济、使用管养安全等角度,确定合适的管线过桥组合方案;对于处于平面交叉口处的变宽桥梁,应综合考虑美观、经济、实施简单等方面确定最合理的设计方案;与地下工程有关联的市政工程中小桥需沟通多部门,进行多方面的充分论证。     

宜昌市夜明珠路总体方案研究

结合宜昌BRT(快速公交系统)建设对宜昌市夜明珠路进行改造,受众多因素控制,道路改造难度较高。介绍了工程建设条件及总体设计方案。总体方案结合路线两侧现状地形、控制因素等不同特点,将路线分为沿河线段和合流线段两个典型路段,并进行方案比选,综合各方面因素,得出了推荐方案。     

桂林市老城区分流交通保护圈规划设计

文章基于桂林市老城区交通现状,分析了老城区交通存在的主要问题,提出了桂林市老城区分流交通保护圈规划的总体思路,并根据这一思路设计出具体的老城区分流交通保护圈规划方案,为桂林市老城区交通系统规划提供决策依据。     

城市公共交通发展的动力机制研究

城市公共交通发展动力涵盖政府的主导作用、公交运营企业的主动力、公众的支持力以及营销传播的助动力等"四方力量",四方力量的协同推动城市公共交通系统快速发展。首先对城市公共交通发展的动力机制进行分析,研究快速发展面临的困境以及进行公共交通系统动力协调的必要性;然后提出强化政府主导作用的"4P"发展策略、激发公交运营企业主动力的品牌服务策略、拓展公众支持力的乘客关系管理策略、发挥营销传播助动力的促销策略等公共交通协同发展策略;由此增强公共交通竞争力,提高公交出行方式分担率,推动城市可持续发展。     

Understanding members' carsharing (activity) persistency by using econometric model

Carsharing is an innovative travel alternative that has recently experienced considerable growth and become part of sustainable transportation initiatives. Although carsharing is becoming increasingly a popular alternative transportation mode in North America, it is still an under‐researched area. Current research is aimed at better understanding of the behavior of carsharing users. For every member, a two‐stage approach microsimulates the probability of being active in any month using a binary probit model and given that a particular member is active during a month, the probability of that member using the service multiple times using a random utility‐based model. The model is estimated using empirical data from one of the largest carsharing companies in North America. The model estimates reveal that the activity persistency of members is positively linked to previous behaviors for up to 4 months, and that the influence of previous months weakens over time. It also shows that some attributes of the traveler (gender, age, and language spoken at home) impact his or her behaviors. Copyright © 2010 John Wiley & Sons, Ltd.     

Key criteria influencing the choice of Arctic shipping: a fuzzy analytic hierarchy process model

As Arctic sea ice shrinks due to global warming, the Northern Sea Route (NSR) and the Northwest Passage (NWP) offer a substantial reduction in shipping distance between Asia and the European and North American continents, respectively, when compared to conventional routes through the Suez and Panama Canals. However, Arctic shipping routes have many problems associated with their use. The main objective of this paper is to identify the key criteria that influence the decisions of shipping operators with respect to using Arctic shipping routes. A multi-criteria decision-making methodology, the Fuzzy Analytic Hierarchy Process, is applied to rank four potential categories of criteria (‘economic’, ‘technical’, ‘political’ and ‘safety’ factors) and their sub-criteria.

The results of the analysis suggest that, on aggregate, ‘economic’ is the most important category of influential factors, followed by ‘safety’, ‘technical’ and ‘political’ factors. The paper concludes, however, that the most influential specific sub-criteria relate to risks that lie mainly within the ‘safety’ and ‘political’ domains and that, especially in combination, these overwhelm the importance which is attached to ‘economic’ factors such as reduced fuel use. Finally, the implications of these findings for the future development of Arctic shipping are addressed at a strategic level.     

An exploratory study on the Northern Sea Route as an alternative shipping passage

This qualitative inductive research explores the potential benefits for the Scandinavian economy and ports through the implementation of the Northern Sea Route (NSR) as an alternative for container shipping to the established Southern route through the Suez Canal. To extract expert’s opinions and address these objectives, we utilised in-depth face-to-face semi-structured interviews through purposive sampling in a single case study setting. The analysis of the data demonstrates that the commercialisation of NSR can yield benefits for the Scandinavian economy (e.g. GDP increase, jobs creation) and reveals the benefits of Scandinavian ports (e.g. ECA’s, flexibility, hinterland, etc.) compared to other ports in North West Europe, which potentially grasp the NSR as an opportunity. However, it is highlighted that this can only be achieved if Scandinavian countries are proactive and secure their involvement.