辽东山区预防土壤砂砾化的技术措施

简要介绍了辽东山区17万hm 2砂砾化山丘的现状,概述砂砾化山丘的类型、特点,并提出了植物措施、工程措施、封育措施等几种预防砂砾化山丘的技术措施。     

A theoretical foundation for the relationship between generalized origin–destination matrix and flow matrix based on ordinal graph trajectories

This paper shows the relationship between flow, generalized origin–destination (OD), and alternative route flow from a set of ordinal graph trajectories. In contrast to traffic assignment methods that employ OD matrix to produce flow matrix, we use ordinal trajectory on a network graph as input and produce both the generalized OD matrix and the flow matrix, with the alternative and substitute route flow matrices as additional outputs. By using linear algebra‐like operations on matrix sets, the relationship between network utilization (in terms of flow, generalized OD, alternative route flow, and desire line) and network structure (in terms of distance matrix and adjacency matrix) are derived. Copyright © 2012 John Wiley & Sons, Ltd.     

Incorporating Driver Behaviors in Network Design Problems: Challenges and Opportunities

The goal of a network design problem (NDP) is to make optimal decisions to achieve a certain objective such as minimizing total travel time or maximizing tolls collected in the network. A critical component to NDP is how travelers make their route choices. Researchers in transportation have adopted human decision theories to describe more accurate route choice behaviors. In this paper, we review the NDP with various route choice models: the random utility model (RUM), random regret-minimization (RRM) model, bounded rationality (BR), cumulative prospect theory (CPT), the fuzzy logic model (FLM) and dynamic learning models. Moreover, we identify challenges in applying behavioral route choice models to NDP and opportunities for future research.     

公路桥梁技术状况评定方法分析

根据实际工作经验详细分析了桥梁的技术状况评定方法,对计算过程进行了详细说明,并列举了在评定过程中需要注意的问题,提出了公路桥梁技术状况评定的建议。     

Adapt-Traf: An adaptive multiagent road traffic management system based on hybrid ant-hierarchical fuzzy model

Usually, road networks are characterized by their great dynamics including different entities in interactions. This leads to more complex road traffic management. This paper proposes an adaptive multiagent system based on the ant colony behavior and the hierarchical fuzzy model. This system allows adjusting efficiently the road traffic according to the real-time changes in road networks by the integration of an adaptive vehicle route guidance system. The proposed system is implemented and simulated under a multiagent platform in order to discuss the improvement of the global road traffic quality in terms of time, fluidity and adaptivity.     

交-直-交传动内燃机车的技术经济效果

文章阐明了交—直—交传动内燃机车优越的技术性能和经济效果。并对东风_4内燃机车改为交—直—交传动后的经济性进行了估算,结果表明,交—直—交传动内燃机车经济效果显著,仅节油一项,就可在5年内将比交—直传动内燃机车增加的成本全部回收。     

西南地区山岭隧道自动化变形监测技术的效益分析

为了更好地指导山岭隧道变形监测技术选用，提高监测效率并节约成本,从技术和经济效益2个方面对比分析人工监测和自动化监测，阐述各监测方式的技术性和经济性特征，总结不同应用条件下应优先选用的监测技术类型，并提出一套可行的变形监测技术选用程序。研究成果可为现阶段西南地区隧道工程变形监测技术类型选用提供参考。     

动力分散型城郊快速电动车组转向架方案设计

介绍一种动力分散型城郊快速电动车组转向架的主要技术参数和基本结构方案。     

石太客运专线既有工程控制网的现状分析

研究目的：分析既有工程控制网的现状，找出适宜的测量技术解决方案。 研究方法：从新颁无砟轨道和时速200～250km有砟轨道工程测量的技术标准出发，对石太客运专线既有工程控制网的现状进行分析研究，作出总体评价。 研究结果：采用无砟轨道地段的现有隧道工程控制网，需重新建立符合时速200～250km有砟轨道工程测量技术要求的控制测量网。 研究结论：结合工程具体情况，因地制宜，尽量利用既有工程控制网点，做好新建与既有工程控制网的衔接；做好测量技术方案设计，减少对已开工工程的影响，确保整体工程的质量。