Measuring community reaction to urban transportation impacts using Von Neumann‐Morgenstern utility theory

This paper attempts to measure the impacts of urban transportation system improvements or changes on the community. The community's perceptions of the impacts are represented by its utilities (or disutilities) over various ranges of values of the multiple attributes representing these impacts. The utility technique used in the evaluation is based upon von Neumann‐Morgenstern (vN‐M, 1947) Utility Theory, and is applied using Raiffa's (1970) Fractile Method.

The paper specifically applies the technique to model the perceptions of five subgroups within a community to the impact of a new light rail transit system that is being incorporated in the transportation system of the City of Calgary.

Results of the modeling indicate explicitly how the community changes its perception over ranges of values of the attributes evaluated. Biases of various subgroups within the community over these attributes are also shown. Statistical tests indicate that aggregated utility perceptions can represent the utility perceptions of the individual subgroups quite reasonably.     

斗轮式取料机行走位置精确定位

斗轮式取料机行走位置校正装置在定位中起到很重要的作用.分析了原有行走机构定位原理与状况.介绍了新定位装置的设计思路和实施方案,改革后提高了全场设备相互协同的效率和相互保护的可靠性.     

Traffic risk behavior and perceptions of Thai motorcyclists: A case study

This study aimed to investigate Thai motorcyclists' traffic risk behavior and their perceptions of it, information of value in the design and implementation of public health policies and campaigns for the reduction of road injuries. Data was collected by a self-administered questionnaire completed by 399 motorcyclists in Muang Krabi district, Krabi province, Thailand. The questionnaire focused on the respondents' perceptions of general traffic risks and the specific risks at 3 identified hazardous sites. The results of the survey indicated that the correct fastening of helmet straps had a relationship with responsible traffic risk perceptions.     

刚架系杆拱桥钢-混凝土接头传力行为研究

对于钢—混凝土组合结构而言,其两者的有效结合和共同受力是关键。以某座刚架系杆拱桥钢—混凝土接头为对象进行了研究,作为整个桥梁的关键构造,其计算理论是否符合实际及合理显得尤为重要。文章采用解析的方法,考虑了基于三角形反力分布和矩形反力分布两种埋入式接头模式,并在矩形反力分布模式中考虑了钢—混凝土粘结力的影响。将两种计算模式的结果及是否考虑钢—混凝土粘结力计算的结果进行了比较。结果表明：具有类似工程背景的混合拱桥钢—混凝土接头可以采用设结合段的埋入式接头理论进行设计与分析,是否考虑钢—混凝土粘结力对计算结果有较大的影响。     

Flexural gravity wave generation by initial disturbances in the presence of current

The effect of uniform current on the generation of flexural gravity waves resulting from initial disturbances at a point was analyzed in two dimensions. The problem was formulated as an initial boundary value problem under the assumptions of the linearized theory of water waves. By direct application of the Laplace transform and then the Fourier transform, explicit expressions for the velocity potential and free surface elevation were obtained in integral forms; these were evaluated asymptotically for large distances and times by the application of the method of the stationary phase to obtain the far field behavior of the surface elevations in specific cases. Simple numerical computations were performed to illustrate the effect of uniform current on the surface elevation, wavelength, phase velocity, and group velocity of the flexural gravity waves and on the far field behavior of the progressive waves in two different cases, namely, when there is an initial depression concentrated at the origin and an initial impulse concentrated at the origin.     

A Trip Reconstruction Tool for GPS-based Personal Travel Surveys

ABSTRACT

This article reports on the development of a trip reconstruction software tool for use in GPS-based personal travel surveys. Specifically, the tool enables the automatic processing of GPS traces of individual survey respondents in order to identify the road links traveled and modes used by each respondent for individual trips. Identifying the links is based on a conventional GIS-based map-matching algorithm and identifying the modes is a rule-based algorithm using attributes of four modes (walk, bicycle, bus and passenger-car). The tool was evaluated using GPS travel data collected for the study and a multi-modal transportation network model of downtown Toronto. The results show that the tool correctly detected about 79% of all links traveled and 92% of all trip modes.     

THE CHANGES OF CHILDREN′S BEHAVIOR PROBLEMS IN XI′AN DURING FIVE YEARS FROM 1988 TO 1993

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城际快速铁路通过能力研究

城际铁路通过能力的计算和实现在城际铁路运营组织和设计中起着十分重要的作用。对城际铁路通过能力计算进行了分析研究，并利用数理统计的方法分析了城际铁路通过能力计算值的概率实现和置信水平，进而提出了城际铁路区段通过能力计算值的可信度。     

船用钢板移动电磁感应加热温度及变形特性

采用带间隙双回路反向电流(ODIG)感应器作为热源,基于ANSYS多物理场耦合数值模拟方法,结合感应器及周围空气动态移动方法,建立移动式电磁-热交互耦合数值模拟模型。将获得的瞬态温度作为载荷,进行热-弹塑性数值分析,研究船用钢板移动电磁感应加热温度分布和变形分布。分析不同工艺参数(感应器与钢板间隙g、钢板厚度H、电流频率F、电流峰值I_(peak)和移动速度v)对热成形(最高温度T_(um)、宽度b和厚度h)和变形(横向收缩δ_z和横向角变形θ_z)特性的影响。结果表明:温度云图为带预热的双椭圆外形;影响热成形特性的主要因素为I_(peak)、v和g;影响变形最主要的因素是I_(peak)和H。     

宽箱连续组合梁桥受力特性分析

为研究施工过程和汽车荷载布载方式对宽箱连续组合梁桥产生的影响,结合建设中的杭州九堡大桥北侧引桥进行分析。采用ANSYS有限元程序建立该桥宽箱组合梁的板壳和实体模型,分析混凝土采用不同施工过程(一次全部现浇和先跨中后支座逐跨浇注)对结构整体受力的影响及结构计算中汽车荷载按不同方式(按车道荷载+集中力和按车轮荷载)布置时结构的整体受力和局部受力情况。分析结果表明:混凝土的施工过程对大跨度宽箱组合梁的受力产生较大的影响;采用车轮荷载布载方式较采用车道荷载+集中力布载方式能更好地模拟结构的整体受力和局部受力状态。