基于MNL模型的快速干道沿线用地布局研究

为了评估快速干道建设在用地布局形成过程中的作用，研究沿线用地布局的演变机理，提出对快速干道沿线用地布局进行微观量化研究的方法体系，并引入MNL模型对空间单元的用地性质选择建立数学模型，结合地理信息系统的数据功能。实现了快速干道沿线用地布局的模型化。同时以京殊高速公路中山段沿线的用地情况为例加以验证，结果表明：快速干道与其他相关因素一起，以一定的模式影响着沿线每一空间单元的用地性质选择，进而影响着沿线用地布局的形成。     

化工建设项目环境影响技术评估探析

摘要阐述了化工项目环评技术评估实践中，存在的现有环评技术导则覆盖面小、内容需完善，专家库建设不规范、工程分析评估不深入等不足，并提出了完善措施。     

Incorporating social impact on new product adoption in choice modeling: A case study in green vehicles

While discrete choice analysis is prevalent in capturing consumer preferences and describing their choice behaviors in product design, the traditional choice modeling approach assumes that each individual makes independent decisions, without considering the social impact. However, empirical studies show that choice is social – influenced by many factors beyond engineering performance of a product and consumer attributes. To alleviate this limitation, we propose a new choice modeling framework to capture the dynamic influence from social networks on consumer adoption of new products. By introducing social influence attributes into a choice utility function, social network simulation is integrated with the traditional discrete choice analysis in a three-stage process. Our study shows the need for considering social impact in forecasting new product adoption. Using hybrid electric vehicles as an example, our work illustrates the procedure of social network construction, social influence evaluation, and choice model estimation based on data from the National Household Travel Survey. Our study also demonstrates several interesting findings on the dynamic nature of new technology adoption and how social networks may influence hybrid electric vehicle adoption.     

航道疏浚中悬浮泥沙对海水水质和海洋生物影响的数值研究

航道疏浚产生的高浓度悬浮泥沙,对海域环境的影响不能忽视,建立二维悬浮物运输数学模型,模型考虑了不同潮流作用下悬浮物的运输。采用盘锦港海港区海流现场的观测数据对水动力模型进行验证,模拟值与实测值吻合较好。以盘锦港航道工程为例,预测疏浚作业在最不利情况下,悬浮泥沙对海水水质、环境敏感区的影响程度和范围,为环境影响评价提供科学依据。     

Ports and regional development: A spatial analysis on a panel of European regions

This paper analyses the impact of port activities on local development for a sample of 621 TL-3 regions located in thirteen European countries and observed over the period 1998–2009. Using a spatial panel econometric framework which controls for spatial fixed effects, the paper provides an estimate of both the direct and indirect (i.e. spillover) effects associated to port activities. Results suggest that ports might have non-negligible effects on local GDP: interestingly, an important share of the effects takes place outside the region where the port is located.     

城市轨道交通车站疏散乘客行为及影响分析

轨道交通车站突发事件下乘客的疏散行为对安全疏散具有重要影响。通过对轨道交通车站乘客疏散的个体行为和群体行为及其产生的影响进行细致分析,结合疏散行为特性和疏散行为的负面影响提出了缓解和解决措施。     

城市轨道规划中指标权重的确定方法研究

针对城市轨道规划要受各种影响因子作用的特点,提出在规划中应根据不同影响因子的权重区别考虑线网规划方案及站口选址的思想,就因子权重的分析方法及所求权重大小的合理性做出探讨,可为城市轨道的规划研究提供参考。     

交通噪声预测遮挡衰减取值研究

分析了交通噪声预测模式中房屋遮挡衰减量估算中存在的问题。针对不同的公路项目提出了实测和类比两种解决方案。研究结果表明,通过实测法和类比法,可以有效解决房屋遮挡衰减量估算中存在的误差。     

山区高速公路长大纵坡车辙防治分析

长大纵坡的车辙是山区高速公路面临的严重问题之一,分析长大纵坡车辙的影响因素,并从材料、结构设计、施工和养护等方面提出防治措施,对于山区高速公路建设具有一定的指导意义。     

规则波对弹性支承水平板冲击压力的概率分析

通过模型试验研究了规则波对弹性支承水平板冲击压力峰值的概率分布。文中通过对不同组次的试验数据进行统计分析,首先给出了弹性支承与刚性支撑之间水平板波浪冲击压力历时曲线的各自特征;其次研究了弹性支承水平板波浪冲击压力峰值的超值概率分布及拟合曲线和参数;最后讨论了弹性支承刚度与威布尔分布三参数之间的关系。