To examine drivers' perceptions of and attitudes toward car navigation systems, the present study integrated perceived satisfaction and perceived loca-tional accuracy into a modified technology acceptance model, and investigated hypothesized causal paths proposed by the research model with data collected from an online survey (N = 1,204). Results from the structural equation modeling indicated that perceived satisfaction and locational accuracy played crucial roles in determining perceived ease of use and perceived usefulness of the navigation systems. Implications and limitations are discussed.

关键词：汽车导航系统;技术接受模型;感知满意度;感知位置准确性

查看摘要 索取原文[8页]

用高压液相色谱．质谱法鉴定籽瓜中的环磷酸腺苷，并建立高效液相色谱法测定籽瓜中环磷酸腺苷的含量，对样品提取条件进行优化。结果表明：环磷酸腺苷在O．1～100mg几质量浓度范围内线性关系良好，相关系数为0．999 9；平均加标回收率为98．40％，相对标准偏差为3．22％。经单因素试验和正交试验，确定优化的提取条件为料液比1：12(鲜样)和1：60(干样)水提取，提取温度90℃、提取时间40IIlin、提取次数3次。样品前处理和分析方法准确、简便、可靠、重复性好，可用于籽瓜中环磷酸腺苷含量的分析测定。

关键词：籽瓜；环磷酸腺苷；高压液相色谱．质谱法；高效液相色谱法

查看摘要 索取原文[6页]

The self-balanced two-wheel Cars are often devised in various competitions,and are involved in this direction in many large games.Based on the Freescal Semiconductor XS128 series single-chip microcomputer as the core controller,with the gyroscope and angle sensor to achieve two-wheel Car self balance,the self-balanced two-wheel structure,the balance principle and the control algorithm are introduced emphatically,and the self-balanced two-wheel car is finally completed through repeated testing.

关键词：两轮自平衡车;XS128;控制算法;单片机

查看摘要 索取原文[5页]

On May 17, 2013, Isaac A. Garcia, Mucker, age 22, was killed when he was pinned between two loaded ore cars. An electric locomotive was pulling a train of 13 cars loaded with ore up a slight grade when the eleventh car derailed and uncoupled from the tenth car. Garcia was attempting to unhook the safety chain between the two ore cars.

关键词：事故调查,矿山安全;钼;事故原因;职业安全与健康

查看摘要 索取原文[10页]

Carsharing organizations (carshares) provide collectively available vehicles that can be booked for exclusive use on a pay-as-you-go basis. Previous research has shown that two groups join carshares: (a) acces-sors, who do not have a car when they join the carshare and therefore gain access to one, and (b) shedders, who give up a car when they join the carshare. The paper examines the circumstances and motivations that cause accessors and shedders to join a carshare, the changes in their travel behavior in the short and longer run, and how the travel behavior might have changed if the carshare had not been joined. These objectives were achieved through in-depth interviews with 16 members of a carshare in Bath, United Kingdom. The interviewed members were selected to achieve a mix of accessors, shedders, recent members, and longstanding members. It was found that carshare attracted people who were already contemplating giving up their cars or who had been triggered by life events to consider giving up their cars. Joining a car-share prevented the acquisition of cars for some members, but some subsequently took opportunities to acquire a car as their circumstances changed. Once shedders became members, they adapted to managing without a personal car, used a variety of transport modes, planned their activity-travel schedules in advance, and took into account the costs and convenience of different options. The increasing popularity of new mobility options, such as carsharing, also has implications for the methods used to analyze and model travel behavior. The option of joining a carshare and using carshare vehicles should be included in transport models for areas in which carshares operate.

关键词：汽车；交通；旅游；合伙用车；行为影响

查看摘要 索取原文[9页]

As carsharing becomes increasingly popular throughout the world, it would be of interest to understand better the underlying characteristics of the trips made by members when they use the cars. To date, few studies have reported carsharing trip details. This paper presents a methodology to analyze three components of a station-based carsharing member's journey: the locations of the stops, the attributes of the trips, and the characteristics of the trip chains. The method is based on the processing of Global Positioning System traces collected onboard car-sharing vehicles; a 5-min stop criterion is used to divide the trip chains into separate trips. The case study involves the Communauto system in the Greater Montreal area, Quebec, Canada. The study shows that carsharing members make more trips within their trip chains than typical car owners do. However, those trips are shorter and are often made for purposes other than work (shopping or visiting, for example). Members tend to maximize the use of the cars during the rental period (the members are on the move up to 50of the time for short trip chains and 30of the time for longer trips).

关键词：交通；汽车；合伙用车；行为研究

查看摘要 索取原文[9页]

This document contains 10 papers that address parking patrol surveys; smart parking systems; parking at sporting event stadiums; parking utilization in neighborhood shopping centers on transit routes; and cost-effectiveness of traffic and demand management measures. This TRR also examines dynamic ridesharing systems; dynamic vehicle allocation for carsharing systems; travel behavior of carsharing members; residential on-site carsharing and off-street parking in the San Francisco Bay Area; and the effect of carshares on travel behavior.

关键词：通勤交通;停车;旅行分享;旅游需求

查看摘要 索取原文[92页]

On Tuesday, February 19, 2013, at approximately 7:15 p.m., John Myles, a 44- year-old shuttle car operator with four years of total mining experience was fatally injured when he was pinned underneath the rear frame of a rubber-tired battery-powered section scoop. The accident occurred on the Number 3 Section, 002-0 Mechanized Mining Unit (MMU), in the connecting crosscut between the Number 5 and Number 6 entries, two crosscuts inby the section dumping point at survey station No. 1170, and 2 crosscuts outby the working face. The accident occurred as the victim was shoveling loose coal and loose material near the ribs in a crosscut adjacent to an entry where a miner was operating a scoop to clean the roadway. The scoop entered the crosscut in a reverse direction and struck the victim, pinning him beneath the batteries of the machine.

关键词：地下开采;事故调查、事故分析;矿工;损伤;死亡;事故原因;职业安全与健康

查看摘要 索取原文[18页]

The suspension system together with the chassis of the car play an important role in the performance of a race car. The knowledge of the forces that are transmitted through the car's suspension system allows a better adjustment and optimization of various structural components. In this study, an identification method, with a neural network based methodology, was tested using experimental data in order to identify and quantify the horizontal and vertical forces in the wheel hub, which are transmitted to the triangle of the suspension and to the chassis of the car. The obtained results are promising and show that it is possible to use this methodology for real-time monitoring of horizontal and vertical forces acting on the triangle suspension of the formula student car.

关键词：汽车；悬架系统；底盘；神经网络；轮毂

查看摘要 索取原文[9页]

Recent studies have indicated that the accuracy of the emissions estimation in a traffic simulation model can be little improved by using the traditional model calibration approaches. Instead, the model's internal mechanism in depicting the second-by-second vehicle activities needs to be investigated. Since the car-following model is the core component of a traffic simulation model, this paper attempts to conduct a comparative study of car-following models concerning their effects on the explanatory parameter of vehicle emissions, namely, the vehicle specific power (VSP) distribution. The car-following models selected for the analysis are the optimal velocity model (OVM), generalized force model (GFM), full velocity difference model (FVDM), Wiedemann model, and the Fritzsche model. Massive field car-following trajectories are collected, and a numerical simulation method is designed for each car-following model to generate its vehicle trajectories and the speed-specific VSP distributions. By a comparison of VSP distributions collected from the field and generated by car-following models, it was found that OVMs and GFMs generate unrealistic VSP distributions, which will lead to significant emissions estimation errors. By adding the variable of positive velocity difference, the FVDM can effectively improve the accuracy of the VSP distribution and emissions estimation. The VSP distribution of the Wiedemann model differs largely from the field data, which overestimate the peak VSP fraction and the fractions in aggressive driving modes. The Fritzsche model produces VSP distributions consistent with the field distributions. It is also found that the speed-specific VSP distribution is highly correlated with the acceleration distribution. Therefore, improving the accuracy of the speed-specific acceleration distribution is an effective measure to improve the accuracy of the VSP distribution and thus the emissions estimation of the car-following models.

关键词：车辆；碳排放；交通仿真模型；环境监测

查看摘要 索取原文[11页]