Analysis of cross effect on inherent deformation during the line heating process – Part 1 – Single crossed heating lines

This paper describes the effect of previous heating on inherent deformation by a subsequent heating line, more specifically, the case of two heating lines intersecting (crossing) each other. The paper has been divided into two parts. In the first part, the case of single crossed heating lines is studied in detail. The second part of the paper, discusses the case of more than one crossed heating lines. The novelty of the work lies in revealing the cross effect and how, factors such as, for example, the heating condition and the plate geometry, influence the resulting inherent deformation of crossed heating. In addition, relationships to easily get these influences are provided. The results are suitable for a wide range of heating conditions and plate thickness.     

垃圾土力学特性及其路基填筑应用研究

将垃圾土应用于公路路基填筑是实现垃圾土大规模资源化利用的有效途径。本文首先对实际垃圾土进行筛分处理,制得适用于公路路基的垃圾筛余土(简称垃圾土);进而,通过室内试验研究了直接压实垃圾土和固化垃圾土的抗剪强度、CBR值等力学特性;以此为基础,修筑直接压实垃圾土路基试验段,并采用适宜的新型施工工艺修筑固化垃圾土路基试验段,监测路基的工后沉降随时间的变化规律,对比两种垃圾土路基的应用效果。结果表明:固化垃圾土与直接压实垃圾土相比,粘聚力提高1.6~1.9倍,内摩擦角提高30%以上,CBR值提高4.5~5.1倍;固化垃圾土路基的工后沉降比直接压实垃圾土路基降低64.7%,且能够更早地趋于稳定。以上结果证明:本文提出的固化垃圾土路基施工工艺和垃圾土资源化利用途径是可行的。     

Career development for women in maritime industry: organisation and socialisation perspectives

For centuries, the maritime industry has been a recognised place in society dominated solely by men, and even though there were women involved, they were mostly on the periphery. This research aims to fill the gap of women’s career development in this field, by investigating the relationships among the degree of organisational socialisation, women’s workplace culture, and the career development of women in the maritime workplace. The analyses are conducted with the structural equation model with 202 valid questionnaires. The results indicated that women’s workplace culture has a significantly negative relationship with the degree of organisational socialisation, and then in turn, it has a significantly positive relationship with women’s career development in the maritime industry. Finally, the results also indicate that the mediating effect of organisational socialisation existed between women’s workplace culture and women’s career development. According to the empirical analysis, this study makes conclusions as well as suggestions for the maritime enterprises as the reference for human resource management.     

Long-term impact of the Shinkansen on rail and air demand: analysis with data from Northeast Japan

This paper analyses how the high-speed rail construction in Northeast Japan (Tohoku) has affected total demand and interregional travel patterns. We use annual interregional passenger data from 1989 to 2012 and apply regression analysis with the demand between Tokyo and the Tohoku prefectures as the dependent variable. We distinguish particularly between the ‘Full-’ and the ‘Mini-’ Shinkansen, where the latter are branch services running with reduced speed. We find that the ‘Full-Shinkansen’ quickly increases rail and total public transport trips and generates additional rail demand year on year. The ‘Mini-Shinkansen’ impacts are less pronounced. Furthermore, our analysis shows that the Shinkansen has shifted some demand from air to rail once it started operation and increased rail share gradually. We therefore suggest that predictions of demand impacts should carefully distinguish immediate from gradual impacts. We also discuss differences in regional demand in that not all prefectures have gained equally from Shinkansen construction.     

基于特征子序列修正的公交刷卡滞后时间推算

针对一票制公共交通IC卡刷卡系统存在的滞后时间问题,提出基于特征子序列修正的时差匹配推算方法。依托GPS车辆到站信息序列和刷卡聚类序列,分析首末站和中途站站间运行时间分布的差异化特征,分别从两序列中提取大时间差和连续小时间差等特征子序列;利用两种子序列间一对一或一对多的对应关系分别进行初步搜索和二次修正,兼顾匹配过程的效率和精度。将推算流程应用于山西省大同市公共汽车系统,结果显示,抽样车辆的刷卡匹配率均达到99%以上,并且针对不同类型的公共汽车线路具有较强的适应性。     

面向复杂环境的LNG码头合理布局规模仿真案例分析

LNG船舶通过限制性航道进出港时须采取一定的管控措施,具有显著的排他性,布局LNG码头时须确定合理的码头规模,以保障港区各类船舶通航效率。基于多智能体复杂系统的混合模拟仿真建模方法,以宁波舟山港六横港区南侧岸线新布局LNG码头研究为例,建立不同的仿真情境,通过设定的指标进行评价分析,研判在一定通航管控措施条件下六横港区南侧LNG码头合理布局规模,为港口码头布局和岸线合理利用提供决策依据。     

The effect of crowding on public transit user travel behavior in a large-scale public transportation system through modeling daily variations

In this paper, the crowding effect in a transit vehicle is modeled in a time-expanded network that considers the daily variation in passenger flows. The study models the daily variation of in-vehicle crowding in a real large-scale transit system. A transit assignment for this real network is modeled and implemented by constructing a crowding cost function that follows the valuation of crowding and by using the reliable shortest path finding method. The direct application of the crowding model to a real network for the Utah Transit Authority indicates that crowd modeling with multi-user classes could influence public transportation system planning and affect the revenues of transit agencies. Moreover, the addition of the disutility factor, crowding, does not always appear to cause an increase in disutility for transit users.     

船舶动力定位自适应滤波器设计

传统的陷波滤波器虽然能够很好的滤除一阶高频海浪波,但是滤波的同时也使得信号产生了相位滞后,在时域里面的表现就是信号的延时.卡尔曼滤波器虽然能够解决这一问题,但是其非常依赖于船舶模型.本文针对传统陷波滤波器的缺陷,使用了一种积分补偿型陷波滤波器,对传统的陷波滤波器进行改进.并以某拖轮为仿真对象进行仿真实验,其结果表明,该滤波器不但能够很好的滤除高频海浪波,还能够保持很好的相位特性.同时,递推的最小二乘估计(RLS)方法能够实时的估计出海浪的主导波频,使得陷波滤波器具有很好的自适应性.     

透水框架坝生态效应研究

为了研发生态结构,给生态航道建设提供技术支撑,在进行水生生物调研分析的基础上,提出了透水框架坝的结构形式。通过开展相应的水槽试验,对比分析透水坝与实体坝的作用区别,并结合水槽试验成果,从集鱼效应、提高鱼类栖息适合度等方面分析透水框架坝的生态效应。得到主要结论如下:1)从流场分布来看,实体坝在坝后一定范围内存在回流区;框架坝坝后无回流区存在; 2)相对于实体坝,透水坝作用效果较弱(冲刷坑深度约为实体坝的60%),作用时间更长; 3)透水框架坝能够起到人工鱼礁的作用,框架坝的内部空隙为鱼类等水生生物提供栖息庇护场所,对鱼类有较强的诱集效果; 4)框架坝通过提高水体含氧量和提高有利于鱼类的流速区面积来提高鱼类的栖息适合度。     

波形钢腹板连续梁桥设计和施工相关问题探讨

大跨度波形钢腹板梁桥是一种新型桥梁结构,因其采用波形钢腹板替代混凝土腹板,相比传统的预应力混凝土连续梁桥,具有轻型、经济等诸多方面的特点。以前山河波形钢腹板连续梁桥为背景,针对设计和施工中的诸如内衬砼、剪力键、横隔板等相关问题进行了分析探讨。