吹气式液位测量系统在浮船坞的应用

本文对吹气式液位测量系统原理和在浮船坞中的应用进行全面的分析,并与其它方式的液位测量作对比分析。     

振冲法在大厚度回填砂基处理的应用

通过工程实例介绍振冲技术在大厚度回填砂地基处理上的应用前景。     

混合动力电动汽车的结构分析

混合动力电动汽车根据动力系统组成可分为三种基本类型：分析了三种基本结构类型的组成和驱动模式，指出了各自的适用场合及其特点。     

一种VRLA蓄电池的电性能试验及失效模式分析

对一种VRLA蓄电池的部分电性能进行了初步探讨.对电池的容量、内阻、密封反应效率、过充电寿命等进行了一系列的试验.试验结束后,将电池进行了解剖.对电池失效原因进行了分析,主要有三条:①正板栅腐蚀严重,活性物质软化脱落;②电池失水;③负极硫酸盐化.     

遥感影像在电子地图生产中的应用

以SPOT、TM遥感影像为主要数据源 ,介绍了多源遥感影像融合技术以及电子地图的生产技术流程     

POLO轿车ABS的故障诊断及检修

POLO轿车Mark60防抱死制动系统主要由车轮速度传感器、制动压力调节器、电磁阀以及控制单元ECU组成。说明了该系统的工作原理及使用V．A．G1551诊断仪、ABS指示灯诊断故障的方法及车轮速度传感器、线束与连接器、制动压力调节器等部件的检修方法。     

漕俞路淀浦河大桥施工控制

淀浦河大桥是一座主跨 75m的连续箱梁桥 ,采用挂篮对称悬臂浇注。该文介绍了该桥施工控制的目的和内容、工作方法、结构分析及监测内容和成果。     

高速公路填方路基施工的探讨

高速公路填方路堤施工必须从基底处理,填料选择、压实、排水、防护等方面加以重视,依靠科技进步,采用新技术、新材料、新的检测手段,从而保证路基的稳定性和耐久性,进一步提高公路路基施工的总体质量水平,充分发挥投资效益和社会效益。     

公路景观评价研究进展

文章概述目前国内外公路景观评价研究现状,介绍了公路景观评价的基本方法及发展趋势,为公路景观评价工作提供参考。     

The Influences of the Built Environment and Residential Self-Selection on Pedestrian Behavior: Evidence from Austin, TX

Pedestrian travel offers a wide range of benefits to both individuals and society. Planners and public health officials alike have been promoting policies that improve the quality of the built environment for pedestrians: mixed land uses, interconnected street networks, sidewalks and other facilities. Whether such policies will prove effective remains open to debate. Two issues in particular need further attention. First, the impact of the built environment on pedestrian behavior may depend on the purpose of the trip, whether for utilitarian or recreational purposes. Second, the connection between the built environment and pedestrian behavior may be more a matter of residential location choice than of travel choice. This study aims to provide new evidence on both questions. Using 1368 respondents to a 1995 survey conducted in six neighborhoods in Austin, TX, two separate negative binomial models were estimated for the frequencies of strolling trips and pedestrian shopping trips within neighborhoods. We found that although residential self-selection impacts both types of trips, it is the most important factor explaining walking to a destination (i.e. for shopping). After accounting for self-selection, neighborhood characteristics (especially perceptions of these characteristics) impact strolling frequency, while characteristics of local commercial areas are important in facilitating shopping trips.