船首形状对船-冰碰撞性能的影响研究

基于冰的各向同性弹性断裂模型,分别以船首的初速度和冰的厚度为变量,采用LS-DYNA非线性有限元软件对不同船首形状与冰排碰撞问题展开数值模拟研究。研究结果表明,不同形状船首在相同工况下其破冰距离、受到的冰载荷以及能量变化有显著差异。前倾首、飞剪首的破冰能力比直立首、球鼻首强,随着船首初速度的增大、冰厚的增加,飞剪首的破冰能力逐步好于前倾首,球鼻首的破冰能力逐步好于直立首。本文研究对于航行于季节性冰区的船舶具有一定的指导意义。     

武汉市践行慢行交通建设的经验与总结

2015年,在城市快速路、轨道交通基本形成骨架的基础上,武汉市提出"让城市安静下来"[1]的城市建设新理念,力推慢行交通建设。阐述武汉市慢行交通的特征,从面层、线层、点层三方面总结了武汉市慢行交通体系构建和示范项目建设的经验和实施效果。对持续推进慢行交通建设提出了4个方面的思考。     

Bayesian Network Based Approach for Diagnosis of Modified Sequencing Batch Reactor

Wastewater treatment is a complicated dynamic process affected by microbial, chemical and physical factors. Faults are inevitable during the operation of modified sequencing batch reactors(MSBRs) because of the uncertainty of various factors. Abnormal MSBR results require fault diagnosis to determine the cause of failure and implement appropriate measures to adjust system operations. Bayesian network(BN) is a powerful knowledge representation tool that deals explicitly with uncertainty. A BN-based approach to diagnosing wastewater treatment systems based on MSBR is developed in this study. The network is constructed using the knowledge derived from literature and elicited from experts, and it is parametrized using independent data from a pilot test.A one-year pilot study is conducted to verify the diagnostic analysis. The proposed model is reasonable, and the diagnosis results are accurate. This approach can be applied with minimal modifications to other types of wastewater treatment plants.     

武汉东湖绿道交通规划研究

绿道建设是构建"两型社会"的重要举措,也是武汉市建设国家中心城市的具体行动。介绍了东湖绿道交通系统规划及建设情况,从交通目标及对应策略、交通组织分区分级、快速路系统、到发交通、内部交通、配套交通的组织衔接等方面总结城市绿道项目交通组织及配套设施的思路,并介绍了东湖绿道一期工程实施效果,可为国内其他城市提供参考和借鉴。     

钢材类货物海运货损及其风险防控

钢材类货物在海运操作的各个环节容易发生损坏，致使其易在航运实务中产生货损索赔案件，给船东和保赔协会带来经济损失。分析钢材类货物海运货损的类型及原因，提出相应的事前预防措施，并就海运货损发生后如何避免或减少承运人所面临的索赔损失进行探讨。