Using system dynamics in maritime economics: an endogenous decision model for shipowners in the dry bulk sector

In this paper, we consider the benefits of applying system dynamics in maritime economics. We build an endogenous shipowners' model for the dry bulk sector, incorporating both the decision process of individual shipowners and traditional shipping market conditions. The aim is to arrive at a simulation tool that can be used for a variety of applications, both for teaching/learning and for research purposes. Within the endogenous shipping model, we can distinguish between the strategic and the tactical choices shipowners face. As an application, we focus explicitly on a strategic decision-making process that is relevant to any shipowner, i.e. the sale of a vessel. System dynamics seems to be a tool well-suited for the detailed modelling of strategic and operational behaviour in the maritime business.     

72.5 kV GIS系统在松花江大顶子山航电枢纽工程水电站的应用

着重介绍全封闭组合电器的特点、安装方法和安装过程中应注意的事项,增加对全封闭组合电器的掌握,有利于设备更加安全稳定运行。     

Causality between performance and traffic: an investigation with Indian ports

This paper attempts to find out the causal relationship between port performance and port traffic by using Indian data. The use of cointegration analysis has come out with the result that performance precedes traffic in most of the ports of India. Hence, government policy towards performance augmenting facilities should be given priority so that higher efficiency induces higher traffic     

Electro-hydraulic braking system for autonomous vehicles

Reducing the number of traffic accidents is a declared target of most governments. Since dependence on driver reaction is the main cause of road accidents, it would be advisable to replace the human factor in some driving-related tasks with automated solutions. To automate a vehicle, it is necessary to control the actuators of a car, i.e., the steering wheel, accelerator, and brake. This paper presents the design and implementation of an electro-hydraulic braking system consisting of a pump and various valves, allowing the control computer to stop the car. It is assembled in conjunction with the original circuit for the sake of robustness and to permit the two systems to halt the car independently. This system was developed for installation in a commercial Citroën C3 Pluriel of the AUTOPIA program. Various tests were carried out to verify its correct operation, and an experiment showing the integration of the system into the longitudinal control of the car is described.     

均质充量压缩燃烧方式的研究进展及存在问题

介绍了均质充量压缩燃烧 (HCCI)方式的基本概念 ,分析了HCCI能实现较高热效率、低NOx 排放等优点的机理 ,论述了制约和影响HCCI方式的各种因素及其当前的研究进展 ,探讨了HCCI方式面临的主要困难及其解决途径 ,展望了HCCI方式的应用前景     

潭邵高速公路路基膨胀土胀缩等级的评判

膨胀土胀缩性与土性指标之间的关系存在较大的模糊性和地域性。在优选判别方法和指标的前提下，运用模糊数学和等效数值法对潭邵高速公路路基膨胀土进行了胀缩等级的判定。     

预应力锚索框架型地梁的内力计算

提出了预应力锚索框架型地梁内力的一种计算方法，即把框架地梁分解成单梁，按温克尔(Winkler)假定计算各单梁的内力，由此进行框架地梁的尺寸和配筋设计。在内力计算中同时考虑框架地梁的锚索张拉阶段和工作阶段。通过实际工程说明了计算方法。     

结合人体运动特征的行为识别

人体运动具有马尔可夫性质,即当前状态只受前一状态的影响.目前为止,用于人体行为识别的隐马尔可夫模型（HMM）大多使用的是全连接结构（Full-Connected structure）,并且没有把状态数目的选取和状态转移条件与人体运动特性间的关系作为研究重点.本文针对这种关系提出了基于“从左到右三状态半连接HMM”的人体行为识别方法,为每个状态的输出概率引入了权重的概念.实验表明,该方法能够在降低运算复杂度的同时,提高行为识别率,从而证明了人体运动特性分析在HAR领域中的应用价值.     

Travel plans for new developments: a global review

A travel plan is a mechanism for delivering a package of transport measures at a site to manage car use and encourage the use of more sustainable forms of transport. In recent years, travel plans have been required for new infill and greenfield developments through the land-use planning and approvals process, predominantly in the United Kingdom, the United States, continental Europe and Australia. This paper contributes to the literature by providing a global review of travel plans for new developments. The results show that while travel plans for new developments share a common set of elements with those for pre-existing sites, differences within each element are notable, particularly in the types of travel plan measures adopted, processes for managing the travel plan, and approaches to monitoring and review. Results of previous evaluations have varied considerably, although most have reported a reduction in car driver trips of 10–20 percentage points. Despite this, most evaluations lack rigour, with a paucity of robust evidence. Key success factors identified by the literature, such as the provision of an explicit policy supporting the role of travel plans, should be embedded within the travel planning process where possible to ensure best outcomes for new developments.