Systematic approach for recognizing limiting factors for growth of biomethane use in transportation sector – A case study in Finland

In this paper, limiting factors for increased use of biomethane as a transportation fuel are studied. The aim of this research is to recognize and estimate the limiting factors for biomethane utilization in the transportation sector. The limiting factors are studied by using calculation models from Life cycle perspective and literature reviews. According to the results, the main limiting factors can be classified into the following categories: production potential, technology, economy or policy. For biomethane utilization in Finland, the main limiting factors seem to be the lack of distribution infrastructure in northern parts of the country and the uncertain economical feasibility for agricultural biomass producers and for vehicle owners. From the political perspective, the external costs for petrol operated vehicles are higher than for biomethane operated vehicles. Reductions from the external costs could be used by political decisions as a base to support the growth of biomethane in the transportation sector which could lead to GHG emission reductions. A similar systematic approach can also be used to study limiting factors for other transportation energy systems.     

浅谈延迟焦化装置露天栈桥的设计

根据延迟焦化装置露天栈桥的工程设计实践,围绕一炉两塔(一个加热炉两个焦炭塔)的焦化装置,分析了露天栈桥设计中的要点及难点,对其在平面布置、基础安排和吊车梁选型等设计方面做一些介绍和论述。     

军械调运方案优化算法的设计与仿真

军械调运问题的数学模型和手工算法过去已有研究,但是当问题较为复杂时,手工算法就要花费大量时间而且准确性也难以保证。针对这一缺陷,本文在已有的数学模型和手工算法的基础上,设计了一种可以用计算机实现的基于递归的算法来寻求军械紧急调运问题的最优方案,并使用面向对象的java语言将算法实现。     

黑龙江化肥厂锅炉房用煤车、贮存、运输方案的优化设计

通过对原可行性研究报告中的锅炉房用煤采用筒仓群贮存方案的了解、分析、比较后,提出了采用矩形库贮存煤的优化方案设计的成果。     

试谈铁路运输企业发展第三方物流的对策

从物流及第三方物流的概念着手,主要分析了物流与铁路运输的本质区别,并就铁路运输开展第三方物流优势及存在问题进行了详细分析,重点论述了铁路运输业开展第三方物流的可行性及有关对策。     

不停输抢修技术在长输管道中的应用

油气长输管道在运行过程中易受到自然和人为因素的破坏,例如:洪水冲刷、防腐层老化、阴极保护失效、管道占压、不法分子打孔盗油(气)引起管体缺陷等,因此,管道抢修是管道运行管理工作中的重要组成部分。为了延长管道的使用寿命,避免停输抢修给企业造成不必要的经济损失,对不停输抢修技术在长输管道中的应用进行了研究,有效地降低了管道经营成本,对企业进行油气管道运行管理具有一定的借鉴指导意义。     

Siting park-and-ride facilities using a multi-objective spatial optimization model

Park-and-ride services are an important component of many public transportation systems in the United States. Locating park-and-ride facilities is an essential step when planning for these services. In this research we focus on three major siting/modeling concerns that need to be addressed when siting park-and-ride facilities: covering as much potential demand as possible, locating park-and-ride facilities as close as possible to major roadways, and siting such facilities in the context of an existing system. Unfortunately, existing models do not enable each of these concerns to be simultaneously addressed. This paper presents a multi-objective spatial optimization model for integrating these considerations. This model is applied for siting park-and-ride facilities in Columbus, Ohio. Application results show the usefulness of the developed model in supporting transit planning in an urban region.     

The Topology of Transportation Networks: A Comparison Between Different Economies

This paper presents an analysis of the topology of transportation networks within different systems of cities. Urban entities and their components are complex systems by their nature; there is no central force that affects their spatial structure. Thus, we study transportation networks within different countries as complex networks. Based on the above, we consider cities as nodes, while direct air and railways routes represent the links. We present characteristics of these networks including their degree and clustering coefficient. Transportation networks can be used as an indicator of economic activity between cities. Cities with strong economic relationship are characterized by high volume of connectivity. Our findings suggest that the topology of the analyzed transportation networks can be used to classify the countries they belong to based on their economic development.

Age is more than just a number: implications for an aging workforce in the US transportation sector

The US workforce is aging. At the same time, there are a record number of open positions in the transportation sector, which has traditionally been a well-paying, but stressful and schedule-dependent, occupation. Due to increasing longevity, need, and ability to work, a possible solution to the transportation workforce shortfall may lie within the retention and recruitment of older workers. This paper uses a socio-technical framework to examine the pertinent, though scant, literature and data related to older workforce demographics and operational needs, the regulatory environment, requisite knowledge, skills and abilities, and application of support technology and training. Although there is evidence of age-related changes in physiology and cognition, the current science remains unable to resolve how an older workforce may most appropriately be applied to transportation to maximize system safety and minimize negative impact to worker well-being.     

基于视频图像处理的交通事件检测系统

针对目前公路事件发生后不能及时有效检测与报警、事故处理延迟等不足,研究开发了一种基于视频图像处理的交通事件检测系统。利用计算机视觉与数字图像处理技术,对设置在公路上的摄像头采集的视频图像,进行事件检测算法智能处理,自动采集各种交通参数,检测交通事件并及时报警,可有效地减少交通延误,防止二次事件发生,保障道路安全。与传统交通事件检测系统相比,具有直观方便、费用低等优点,拥有良好的市场需求和实用价值。