浅议影响沥青混凝土路面平整度的因素及处理措施

分析了路基、基层平整度对沥青路面面层平整度的影响。结合工程实践,从路面原材料、摊铺、碾压及接缝处理等施工环节论述了影响平整度的因素及处理措施。     

Long-term prediction method for the green water load and volume for an assessment of the load line

 To develop a practical prediction method for the green water load and volume on the bow deck in irregular waves, model tests were conducted using a tanker and a cargo ship on a domestic Japanese voyage. The relation between green water load and relative water height at the stem was considered. Based on the finding that the maximum value of the green water load is proportional to the square of the maximum value of the water elevation over the bow top, the probability density functions of the green water load and volume in short-term predictions were proposed. It was verified that the proposed functions show good agreement with the measured distributions, especially in the tails, and were better than conventional functions. Using these functions, long-term predictions of the green water load were carried out. It was confirmed that the present method is more rational than the conventional one for estimating the long-term probability of the green water load. An assessment of the bow height of a domestic Japanese ship from the viewpoint of deck wetness was carried out using these prediction methods. This research was used as the technical background for the revision of domestic rules on load lines, which was enforced in October 2001. Received: July 19, 2002 / Accepted: October 30, 2002 Acknowledgment. Some of the present study was carried out as part of a cooperation project (RR45) with the Shipbuilding Research Association of Japan, supported by the Nippon Foundation. Address correspondence to: Y. Ogawa (e-mail: ogawa@nmri.go.jp)     

船舶进入外国港口权及其法律制度研究

随着国际贸易的发展,外籍船舶是否有权进入他国港口,笔者从国家内水的法律地位及其与领海的区别出发,对船旗国管辖与港口国管辖的竞合问题进行简要论述,就支持船舶有权进入外国港口的学说及其法律论据缺陷展开论述。     

高速公路服务区司乘人员活动规律与设施布局

服务区内司乘人员出行活动规律是进行服务区设施布局的重要依据。好的服务设施空间布局应该和司乘人员活动规律相一致,这样才能提高服务设施利用效率和交通秩序,为司乘人员提供更便利的服务。鉴于此,重点针对京秦、沿海高速公路服务区内司乘人员活动规律进行调查研究,并结合活动链原理提出服务区设施布局形式。     

浅议公路枢纽宏观布局层次划分的方法

通过引入经济学中都市圈的概念，提出枢纽影响圈这样一种枢纽节点间的空间结构，并以此作为枢纽节点分层的方法，进而实现公路运输枢纽的宏观布局，这为相关研究提供了一种新的思路。     

多排开孔钢板剪力键群受剪性能研究

采用有限元软件Abaqus,对多排开孔钢板剪力键群的抗剪性能进行模拟研究。考察不同参数(混凝土强度、贯穿钢筋直径、开孔孔径、开孔排数、开孔距离、钢板厚度)对PBL剪力键承载力的影响及其影响规律,同时研究了多排PBL剪力键内力分布规律。结果表明:混凝土强度越大,PBL剪力键承载力越大,同时较迟进入强化阶段;增大钢筋直径在提高PBL剪力键承载力的同时也提高了其屈服后的刚度,且钢筋直径与PBL剪力键承载力呈二次函数关系;孔距不变时增大孔径,PBL剪力键承载力将先增大后减小,这是由于孔距未满足最小孔距要求;开孔排数增多会明显提高PBL剪力键承载力和初始刚度,且开孔排数与承载力呈线性关系;钢板厚度基本不影响承载力;当PBL剪力键的排数达到一定界限以上时,前4排承担了90%的外力,当排数较少时,不同排的剪力键承担的剪力分布为哑铃型。     

浅谈阳离子乳化沥青性能及影响因素

介绍了阳离子乳化沥青的技术性能及对性能产生影响的各种因素,对施工质量控制具有一定的指导作用。     

桥梁伸缩装置在公路桥梁中的设计应用简介

通过对本地桥梁伸缩装置在设计和施工养护中一些关键因素的控制介绍,以供工程技术人员借鉴。     

Are we successful in reducing vehicle miles traveled in air quality nonattainment areas?

An important planning and policy question in the transportation, energy, and environment areas is whether or not air quality control and the associated funding preference and mitigation efforts to attain air quality conformity have indeed led to traveler behavior changes such as reduction in vehicle miles traveled (VMT) or VMT growth rates. In this research, we develop statistical models to analyze the relationship between air quality nonattainment designation and VMT between 1966 and 2004 based on observed data. These models employ different statistical methods, including hypothesis testing and simultaneous equations. Findings from these statistical models and datasets are consistent, and suggest there is a statistically significant negative correlation between nonattainment designation and VMT/VMT growth. For instance, the simultaneous equation model in this research, suggests that if a nonattainment area and an attainment area that are similar in all other aspects (population composition, socio-economics, urbanization, fuel price, vehicle stock, etc.) are compared, the VMT in the nonattainment area will be 1.80% less than that in the attainment area in the short run, and 7.61% less in the long run. While these results show strong statistical evidence that efforts in reducing VMT in nonattainment areas have been successful, future research should be conducted to attribute the VMT reduction effects to specific policy instruments for decision-making (e.g. the Congestion Management and Air Quality Improvement program, the conformity regulation in the transportation planning process, etc.).     

基于UTAUT 的无人驾驶公交乘客接受度模型

为解决无人驾驶公交缺少乘客接受度定量描述方法的问题，在整合型技术接受模型的基础上，通过使用意向及使用行为探讨乘客接受度，构建了无人驾驶公交乘客接受度模型. 运用结构方程模型分析各影响因素之间的定量关系，以及各因素对无人驾驶公交使用意向及使用行为的作用大小. 最后将模型应用于重庆市公交出行者的实例分析中，结果表明，感知风险(-0.89***)和个人创新性(0.72***)对无人驾驶公交使用意向最为显著，而使用意向对使用行为起着决定性作用(0.98***)，并分析了年龄、性别、受教育程度对各影响因素调节作用的显著差异性.