一般地面属性区关系的识别与运算

介绍了地面属性区运算的基本概念与目前存在的主要问题 ,提出了在综合数字地面模型建模及运用中 ,一般属性区之间关系识别与运算的一种计算机算法 ,较好地解决了多连域属性区之间的关系和运算问题 .     

A nationwide study of factors associated with household car ownership in China

Car ownership is growing very rapidly in China; whilst this is a reflection of sustained economic growth, it presents a major challenge to Chinese transport policymakers. The consequences of China's motorization also extend beyond the national borders, however, via mechanisms such as increased demand for new automobiles produced in North America and Europe and the global atmospheric concentration of greenhouse gases. Chinese cities are also experimenting with innovative transport policies to manage increasing car ownership, which in a number of cases go beyond the menu of policy options that have traditionally been considered in the West. Despite policy interest for these reasons, China's motorization process is poorly understood, in part due to a scarcity of relevant data.This paper contributes to the body of literature regarding this phenomenon by drawing on a unique data resource: the 2011 wave of the China Household Finance Survey (n = 8438 households). This is a disaggregate national-scale survey dataset developed to monitor economic conditions in China, though to the authors' knowledge the CHFS has not previously been employed to study patterns of car ownership.We report a set of three analyses, to identify factors associated with: 1) whether a household owns at least one car, 2) multiple car ownership, and 3) whether a household owns a new car. Amongst other empirical results, we find that living in a rural area is negatively associated with car ownership, net of confounding effects, and that within towns/cities poor accessibility (i.e. long travel time) to the town/city centre is also negatively associated with car ownership. These findings regarding spatial effects are contrary to typical findings in the West, where car ownership is generally lowest in urban centres.An earlier version of this study was presented at the 2017 Transportation Research Board conference.     

基于GIS的铁路线路设计系统研究与开发

将地理信息系统技术应用于铁路线路设计,开发基于GIS技术的铁路线路设计系统.介绍系统设计的总体思路,对铁路线路设计GIS的建立、基于GIS的铁路选线交互设计方法以及铁路选线设计应用分析模型等关键技术进行详细研究.     

北京地铁蒲黄榆车站监控量测及信息反馈技术

主要介绍北京地铁5号线蒲黄榆车站施工过程中的监控量测技术,指出浅埋暗挖地铁施工要遵循新奥法原理,以量测信息指导设计和施工。     

高分辨率地震调查系统在天然气水合物调查船上的应用

高分辨率地震调查作为一种重要的技术手段广泛地运用于海洋调查船中的地质勘探——尤其是勘探天然气水合物的调查船上。该文就此系统作了详细阐述,意在为做此类调查船的设计师提供设计依据。     

常规公交运行舒适度的影响因素分析

运行舒适度是衡量常规公交服务质量的重要指标。采用问卷调查形式,从乘客感知的视角,结合重要性因素排序、5级李克特量表与乘客满意度,通过排序分析和SPSS多元线性回归,得到不同承载率时,常规公交运行舒适度的主要影响因素及相应权值。研究表明:承载率L>1时,拥挤、平稳性和卫生是运行舒适度的最主要影响因素,权值分别为0.41,0.33和0.26;承载率L≤1时,卫生、车内噪音和行车平稳性是运行舒适度的评价指标,权值分别为0.38,0.36和0.26。     

农村公路安保设施有效性评价指标研究

为评价农村公路安保设施的有效性,提出了速度、行车轨迹、生理、交通事故以及满意度等5个评价指标,并对其适用性进行了分析;结合实际观测数据,举例说明速度和行车轨迹指标的应用。分析表明:速度和行车轨迹指标可在较短的时间内对部分微观层面的农村公路安保设施的有效性进行评价;生理、交通事故以及满意度指标均可用于微观和宏观两个层面的安保设施有效性评价,但在应用的过程中均有一定的限制性。     

道路平曲线辅点加密的一种方法

现代道路施工,由于施工企业机械化程度的提高,这就要求测量放样快速准确。介绍了平曲线加密的一种简捷方法,分为圆曲线加密与缓和曲线加密,使小半径平曲线辅点的测放简捷易行。     

自复位桥梁墩柱节点分析

自复位桥梁墩柱节点由耗能组件和弹性自复位组件两大部分构成。耗能组件如耗能钢筋、阻尼器等提供足够的耗能能力;弹性自复位组件如无粘结预应力钢筋等可以有效减小震后残余变形。结合自复位桥研究的有关文献,综合分析自复位桥梁墩柱节点试验研究、数值模拟和工程应用方面的现状,提出今后研究发展方向。     

居民出行OD调查中数据缺失问题及其EM算法研究

居民出行OD调查数据的缺失,将会给调查数据的后期处理工作带来一定的困难.通过EM算法介绍,讨论如何应用基于样本的EM方法来解决OD调查中的数据缺失问题,并通过具体实例演示其操作过程,验证该方法可为交通预测者科学预测、合理规划提供完整、准确的数据基础.