钢桥桥面铺装方案环道试验研究

在专门设计加工的环道正交异性板钢桥上 ,进行了多种铺装方案的环道疲劳试验、高温抗车辙试验 ,比较各种铺装的使用性能与材料、结构的关系。     

高速铁路钢轨的平顺性

综述了高速铁路的轨道平顺性与钢轨平顺性的关系。介绍了高速铁路对钢轨平顺性的要求及高速铁路发达国家在钢轨生产、焊接和使用过程中提高钢轨平顺性的措施，分析了国产钢轨平顺性的现状及其与高速铁路钢轨要求的差距，提出了我国钢轨生产企业为适应高速及快速铁路发展应予重视有关问题的建议。     

The Increasing Role of Latent Variables in Modelling Bicycle Mode Choice

The growing interest in promoting non-motorised active transport has led to an increase in the number of studies to identify the key variables associated with bicycle use, and especially those related to the bicycle mode choice problem. This paper presents a comprehensive survey of the modelling literature on the choice of the bicycle for utilitarian purposes, and summarises and assesses the evolution of the explanatory variables and methodologies used. We review both the evolution of the incorporation of latent variables in bicycle mode choice models and the critical role they play. The chronological evolution of the studies is divided into three stages —initial, intermediate and late — according to the different ways of introducing attitudinal or perceptual indicators and latent variables into the models. Our review shows that the incorporation of latent variables in bicycle choice models has increased in the last decade, with a progressive use of more sophisticated methodologies until the arrival of complex models that explicitly and properly deal with psychological latent variables. In fact, with the use of hybrid choice models, latent variables have nowadays become the core of bicycle mode choice models. Based on our review, a set of questions is proposed as a uniform measurement scale to identify attitudes towards bicycling. Recommendations for future research are also presented.     

A congested and dwell time dependent transit corridor assignment model

This research proposes an equilibrium assignment model for congested public transport corridors in urban areas. In this model, journey times incorporate the effect of bus queuing on travel times and boarding and alighting passengers on dwell times at stops. The model also considers limited bus capacity leading to longer waiting times and more uncomfortable journeys. The proposed model is applied to an example network, and the results are compared with those obtained in a recent study. This is followed by the analysis and discussion of a real case application in Santiago de Chile. Finally, different boarding and alighting times and different vehicle types are evaluated. In all cases, demand on express services tends to be underestimated by using constant dwell time assignment models, leading to potential planning errors for these lines. The results demonstrate the importance of considering demand dependent dwell times in the assignment process, especially at high demand levels when the capacity constraint should also be considered. Copyright © 2017 John Wiley & Sons, Ltd.     

厄尔尼诺和拉尼娜对全球,中国气候及对航海的影响

本文用海气相互作用简述了厄尔尼诺和拉尼娜事件的成因,浅析了厄尔尼诺（ＥＬＮｉｎｏ）和拉尼娜（Ｌａ Ｎｉｎａ）事件对全球、中国气候及对航海的影响     

褪黑素对人食道磷癌Eca-109细胞的生长抑制作用

目的　研究国产褪黑素对人食道磷癌Eca 10 9细胞的生长抑制作用及其作用机理。方法　采用不同浓度的褪黑素通过体外细胞培养、MTT显色技术研究其抑制作用 ,通过流式细胞仪和透射电子显微镜技术观察 ,对其作用机理进行探讨。结果　褪黑素对人食道磷癌Eca 10 9细胞具有抑制作用 ,其IC30 、IC50 分别为 0 .89、1.6 0mmol·L- 1 。以IC30 的褪黑素处理Eca 10 9细胞 ,使其倍增时间由 33.6h延长到 39.4h。流式细胞仪观察到褪黑素可导致Eca 10 9细胞G0 G1 期比例升高 ,S期比例降低。透射电镜可观察到以IC30 的褪黑素处理的细胞 ,其超微结构发生了退行性改变。结论　褪黑素对人食道磷癌Eca 10 9细胞具有抑制作用 ,其作用机理可能是褪黑素导致细胞周期从G1 到S阶段的推迟进行     

模糊随机最短路径问题模型与算法

最短路径问题在现实生活中有着广泛应用,许多专家学者对此问题进行了深入研究.到目前为止,所有这些研究都是针对静态最短路径问题以及不确定最短路径问题中具有模糊或随机参数的问题.然而在现实世界中,有些系统中有很多不确定因素,因此很有必要对具有多重不确定参数的最短路径问题进行研究.本文主要研究具有模糊随机参数的最短路径问题,基于机会测度理论,分别建立了模糊随机期望值模型、机会约束规划模型及相关机会约束规划模型,然后设计遗传算法求解.     

湿陷性黄土钻孔夯扩挤密桩复合地基参数试验研究

通过试验研究分析钻孔夯扩挤密法在处理兰州地区厚层强烈湿陷性黄土地基时设计与施工参数的选取和处理后复合地基处理效果等方面的内容,确定了最佳桩间距L=1 000 mm,单位夯击能为5 400 kN·m/m3,在其处理深度范围内,桩间土的湿陷性已消除,单桩承载力特征值为650 kPa,复合地基承载力可达350 kPa,桩土应力比为2.5,土的物理力学性质指标明显改善.     

重庆单轨三号线信号系统ATP设备故障时的系统动作及应对方案

重庆单轨交通三号线信号系统ATP子系统具有各种诊断功能,当检测到故障时自动向ATP维护终端发送报警信息并对各种故障进行管理。特别是对故障会给列车运行带来障碍的设备,构成冗余系统,主备机之间相互监视状态。当单套设备故障时,系统能正常工作;当双套设备故障时,系统根据故障范围进行故障导向安全的动作。本文描述了ATP设备发生故障时的系统动作及应对方案。     

山西中南部铁路通道武陵至兖州段小流域径流计算方法的确定

结合本工程沿线勘测实例,利用地方暴雨径流计算公式和铁三院平原区暴雨径流计算公式计算出的流量与用形态法推算出的流量进行比较分析,确定了本地区地面暴雨径流的计算办法和有关参数的取值.