浅析台架测试精度校准方法与影响

台架测试是发动机开发最重要的一个环节,测试数据能够充分地反馈发动机的整体性能。燃油经济性、动力性,以及发动机NVH测试反馈的舒适性都能够在台架测试中得到准确的数据反馈。设备的精度高低是得到有效数据的重点要求,文章对量检具的核查的方法以及要求进行充分介绍。     

商用车轮胎花纹对车辆燃油经济性的影响

轮胎作为车辆唯一与地面接触的元件,轮胎状态是整车性能表现关键的一环。轮胎花纹对汽车动力性、操控稳定性、整车舒适性和燃油经济性都存在一定影响。其中,轮胎花纹对燃油经济性的影响主要体现在对轮胎滚阻系数的影响,理清轮胎花纹形式和燃油经济性的关系对整车轮胎选型有着重要的意义。     

通货膨胀下高速公路公私合营项目的收入调节研究

为研究公私合营(Public-Private Partnerships,PPP)项目中通货膨胀被低估或高估带来的风险及应对方法,以高速公路为研究对象,考虑通货膨胀引起的运营成本和货币时间价值变化,在通行费价格定期调整的基础上,提出通货膨胀下的收入调节方法,包含收入补偿和超额收入共享.研究发现,收入调节能有效地在通货膨胀...     

Mapping and evaluating the complexity of information flows in freight transport chains

ABSTRACT

The role of information in the efficient management of freight transport systems is well acknowledged. Administrative functions, such as negotiation or payments, involve intensive communication, while the production of the transport service relies heavily on the sharing of information (e.g. track and trace). Yet, specific literature on information flows is relatively scarce. This paper sets out to contribute to filling in this gap. Firstly, it elaborates a set of maps of the information flows for four conceptualisations – direct link, corridor, hub and spoke, and connected hubs – of maritime freight transport, initially proposed by Woxenius (2007, “Generic Framework for Transport Network Designs: Applications and Treatment in Intermodal Freight Transport Literature.” Transport Reviews 27 (6): 733–749. doi:10.1080/01441640701358796). The results reveal a high degree of similarity between import and export services. Secondly, it assesses the complexity of each conceptualisation’s flow network using the concept of entropy. Flows are characterised along four variables: involved agents, timing, and contents and message type. Additionally, a new taxonomy is proposed to categorise the messages. The results evidence the heterogeneous contributions of each category to the complexity of the flows. Finally, the results also reveal that the information flows for the tasks in the pre-transport stage are not specific to the conceptualisation in question and are of comparable complexity to the flows occurring during the transport stage.     

Themes and tools of maritime transport research during 2000-2014

This study examines how maritime transport has been researched through a comprehensive review of papers published in 19 transportation journals over the period 2000–2014. Systematic investigation shows that Maritime Policy & Management plays a prominent role in publishing maritime transport research. At the same time, ‘shipping’ is a dominant research area, with ‘port management, service, performance, efficiency and competitiveness’; ‘shipping market, industry, freight rate and economic impact’; and ‘terminal studies’ as the most popular topics. Nevertheless, few efforts have investigated ‘shipping finance’; ‘shipping service’; or ‘port risk and security.’ Since 2000, the use of quantitative analysis techniques has steadily increased in maritime transport to help participants make decisions scientifically. We here present the major data analysis techniques and highlight some limitations regarding their application. Thus, we provide a better understanding of how maritime transport research has been undertaken in a quantitative manner.     

海上打设塑料排水板施工的质量与安全控制

针对海上打设塑料排水板的施工环境及工艺,分析明确了影响施工质量及安全的主要因素是施工船舶、机具和施工工艺,并在此基础上提出了相应的控制措施。经多年施工应用,这些措施都是可行的。可为类似工程提供参考。     

海事行政处罚网上远程处理的思考与实践

文中探讨了海事行政处罚工作在远程受理、异地执行实现方式上的必要性和可行性,并结合笔者在此方面开展的尝试．性工作所取得的初步成果,介绍了现有的“海事行政处罚辅助受理系统”功能特点及使用情况。旨在向读者提供海事行政处罚受理形式上的新思路,以求借助先进的计算机网络技术突破传统的海事违章处理模式,为海事行政相对人提供便利服务。     

谈谈“行政执法一面旗”与海事文化建设

"行政执法一面旗"建设,强调依法行政,执法为民理念,体现海事行政执法先进性,是社会主义核心价值体系的重要内容,是海事系统践行"三个服务"的重要举措,是海事事业科学发展的重要保证.海事文化是海事系统在长期水上安全监督、改革发展中倡导、积累、筛选、提炼形成的思想方法、价值取向和行为习惯,是海事核心竞争力的核心要素和重要组成部分,代表了海事发展软实力.文中通过探讨"行政执法一面旗"建设和海事文化建设的内在关系,以此加深对"行政执法一面旗"深刻内涵的理解,拓宽海事文化发展思路,促进海事事业又好又快发展.     

论海事行政执法如何实现法律效果和社会效果的统一

在海事执法过程中难免会遇到合法性和合理性冲突的局面。出现这种价值冲突的时候该如何选择？这是当今行政执法中的一个重要课题,也是具体实践中的一个难题。文中就海事执法在社会效果和法律效果发生冲突时如何作出价值选择,如何实现海事执法的法律效果和社会效果和谐统一提出了自己的建议。     

非体系航运企业标准化安全制度建设的几点思考

文中针对目前我国非体系航运企业和船舶的基本状况找出了在安全生产过程中存在的主要问题,认为建立健全非体系航运企业安全制度是提高管理水平的关键,运用安全管理体系理念建设非体系航运企业是解决安全生产问题的突破点。