纤维粘结下封层性能浅析

通过剪切试验、拉拔、抗渗以及刹车制动的试验方法,对不添加纤维和添加纤维后的踟№乳化沥青下封层分别进行了试验比较,总结了增加纤维粘结下封层的优越性,对比分析了两种下封层的剪切和拉拔的试验结果和实际产生的影响。结果表明,纤维增强粘结下封层的性能较普通粘结下封层性能更具有优越性。     

The origins,development and future directions of data envelopment analysis approach in transportation systems

Over the last two decades, application of Data envelopment analysis (DEA) in transportation problems have gained considerable research attention. This paper presents a literature review and classification of the applications of DEA in transportation systems (TSs). First by classifying 40 papers from 2007 to 2018, the origins of DEA in transportation problems have been reviewed. Then the development and an overall view of DEA applications in TSs have been presented. We have classified the applications of DEA into six different contexts. In each context, published papers have deeply been analyzed. Content of analysis includes “Number of published papers during the time”, “target journals”, “countries”, “keyword frequency”, “most cited papers”, “map of most co-cited publications”. More important, we reported the “inputs and outputs variables” used in each paper. Further “a review of the selected papers” and “gaps/future research directions” have been given within each cluster. The results show that DEA is one of the most useful approach in evaluating TSs for policy makers. On the other hand, DEA can help the decision makers in transportation especially regarding environmental factors, sustainable development and eco-design. Finally, we proposed subjects for future researches including guidance for new studies in the field of DEA applications in TSs.     

专利审查高速路的利益架构及我国的完善策略

目前全球专利申请激增,专利审查高速路缓解了传统审查方式存在的审查资源和审查速度不适应性问题。有效节省成本、缓解审查积压、提高工作效率是构建专利审查高速路的初衷,但更重要的是需要考虑审查协作过程中形成的利益结构,平衡各国不同的利益诉求,注重公平和效率,促使该审查协作模式长期稳定运行。     

代建制模式下高速公路建设项目的财务管理问题研究

本文在分析我国高速公路建设项目代建制管理模式的基础上,考察了代建制模式对我国高速公路建设项目财务管理的影响,分析了代建制模式下我国高速公路建设项目财务管理的问题,认为代建制是我国高速公路建设项目管理模式的基本方向,并提出了完善代建制模式下高速公路建设项目财务管理的对策建议。     

浅谈公路沥青路面预防性养护

为了保持建成的公路具有良好的使用性能,保证社会经济所要求的适用质量和服务性能,保证国家的投资发挥最大的效益,必须遵循建养并重的方针,通过对现有路网的技术改造和强化科学养护管理,由原有的被动型,应急型的传统养护方式,向科学、现代的预防性养护方式转变。预防性养护正是这种有别于传统的矫正性养护的方式,是对现有道路有计划、经济有效的一项维护措施。     

Combined impacts of highways and light rail transit on residential property values: a spatial hedonic price model for Phoenix,Arizona

This study analyzes the positive and negative relationships between housing prices and proximity to light rail and highways in Phoenix, Arizona. We hypothesize that the accessibility benefits of light rail transit (LRT) and highways accrue at nodes (stations and highway exits specifically), while disamenities emanate from rail and highway links as well as from nodes. Distance decay of amenities and disamenities is captured using multiple distance bands, and hypotheses are tested using a spatial hedonic model using generalized spatial two-stage least-squares estimation. Results show that proximity to transport nodes was associated significantly and positively with single-family detached home values. As a function of distance from highway exits and LRT stations, the distance-band coefficients form an inverted-U pattern consistent with a positive longer-range distance–decay accessibility effect minus a smaller and shorter-range distance–decay disamenity effect. The positive accessibility effect for highway exits extends farther than for LRT stations. Coefficients for the distance from highway and LRT links, however, were not significant. We also test the effect of highway design on home values and find that below-grade highways have relatively positive impacts on nearby houses compared to those at ground level or above.     

An assessment method for highway network vulnerability

This paper introduces a methodology to assess the level of vulnerability of road transport networks. A new technique based on fuzzy logic and exhaustive search optimisation is used to combine vulnerability attributes with different weights into a single vulnerability index for network links, which may be used to measure the impact of disruptive events. The network vulnerability index is then calculated using two different aggregations: an aggregated vulnerability index based on physical characteristics and an aggregated vulnerability index based on operational characteristics. The former uses link physical properties such as its length and number of lanes, whilst the latter reflects aspects of the network flow. The application of the methodology on a synthetic network (based on Delft city, Netherlands) demonstrates the ability of the technique to estimate variation in the level of vulnerability under different scenarios. The method also allows exploration of how variation in demand and supply impact on overall network vulnerability, providing a new tool for decision makers to understand the dynamic nature of vulnerability under various events. The method could also be used as an evaluation tool to gauge the impact of particular policies on the level of vulnerability for the highway network and highlight weaknesses in the network.     

关于乳化沥青在公路养护中的应用

公路养护是保证公路工程安全畅通使用的一项重要工作,乳化沥青稀浆封层是一种较好的养护手段.对稀浆封层的特点、结构种类及选择、稀浆封层材料的要求,以及稀浆封层施工要求加以探讨.     

How highway safety regulations and enforcement activities affect subcategories of motor vehicle fatalities

This paper uses seemingly unrelated regression analysis and annual Ohio data for 1975–2000 to estimate a model for six different types of motor vehicle fatalities: car occupants, light truck occupants, large truck occupants, motorcyclists, pedestrians, and pedalcyclists. It finds that while certain government highway safety regulations (e.g., speed limits) and enforcement activities (e.g., drunk driving arrests) have life-saving effects, not all groups are beneficiaries.     

浅谈如何控制公路工程的质量

文章从人、材料、机械、方法四方面分别阐述影响公路工程质量的因素及其控制措施。