The role of household members in transporting adults with disabilities in the United States

Because of certain requirements under US federal law, many studies have been published in recent years on the role of fixed-route transit and paratransit in meeting the travel needs of persons with disabilities. Although persons with disabilities are several times more likely to take rides from household members than to take public transit, little research has been conducted to explore the circumstances under which such rides are given or taken. To address this gap in literature, this study examines the role of household members in transporting persons with disabilities in contemporary America. It explores how the circumstances for the ride takers may change in the future, identifies future challenges in providing mobility to persons with disabilities, and examines ways to meet those challenges. Using nationwide data from the 2009 National Household Travel Survey, the study compares the rides taken by persons with disabilities from household members with trips made by other travel modes, the persons who take rides with those who do not take rides, and the drivers who provide rides with those who do not provide rides. Probit models are used for the comparisons. Implications of the findings are discussed in light of potential demographic changes in the future, especially the growth of single-person households and the consequent loss of household support for transportation. Due to similarities in circumstances in other developed countries, an international context to the study is also provided.     

Noise effects and real estate prices: A simultaneous analysis of different noise sources

We simultaneously analyze the effects of alternative noise sources to isolate their relative harms. This research adds to the literature, which has only analyzed one noise source or has aggregated the noise levels of different sources. Flight noise had the most negative effect on housing prices, and road and train noises had similar but smaller effects.     

潜水器纵倾调整系统噪声分析及控制建议

针对潜水器纵倾调整系统,从噪声源种类、机理和传递途径入手,分析该系统在2种工作工况下的有效噪声源.通过对有效声源进行内部振动加速度测试和外部水噪声测试,结合已有研究成果,逐步分析该系统对潜水器水噪声的影响,并据此提出潜水器纵倾调整系统在各工况下的低噪声控制建议.     

TJ165架桥机装载加固方案的研制和试验

从主机及机动平车、倒装龙门架、机臂4个方面介绍TJ165架桥机的装载加固方案,并进行装载加固方案的计算及验算。     

高职院校思想政治理论课实践教学的研究与探索

实践教学是高职院校思想政治理论课实践育人的重要形式和载体,探索思想政治理论课实践教学的新途径和新方法,不断创新思想政治理论课的实践教学模式。适应高职院校的人才培养特点,使得思想政治教育理论课实践教学与专业教学的实践相结合,以不断提高思想政治教育理论课实践教学的针对性和实效性。     

影响天窗成本的主要因素研究

本文从汽车天窗的功能出发,分析了汽车天窗发展现状和总体趋势。并以A公司的一片式天窗为例,对天窗系统成本进行分解和分析,同时对S公司不同尺寸的天窗研发费用和模具费用变化进行研究,得出天窗尺寸大小是天窗成本的直接影响因素。研究结果对汽车制造企业合理利用资源,控制生产成本具有一定指导意义。     

汽车电子控制自动离合器系统的研制分析

文章针对现有汽车电子自动离合器存在的缺点,设计了一套汽车电子自动控制离合器系统.该系统以单片机为控制核心,通过采集汽车的各种行车信息,运用模糊自适应算法得到合适的PWM调速信号控制机械执行机构,并配以刹车辅助控制,实现了离合器的平稳、可靠控制,提高了驾驶的舒适性和便利性.     

基于模糊综合评价的帆船行驶最优路径规划方法

路径规划是帆船比赛取胜的重要环节。综合栅格法和模糊概念,提出了基于模糊综合评价的帆船行驶最优路径规划方法。该方法采用栅格法建立帆船航行的二维平面信息,以模糊逻辑为基础,结合帆船的运动信息建立帆船在运动平面上的二维隶属函数模型,并采用模糊综合评价思想,综合考虑行驶速度和接近目标2个因素建立综合评价函数,进行行驶方向决策。利用宽度优先搜索算法实现全局最优路径搜索。仿真结果证明,该路径规划方法能够取得较好的规划结果,对指导帆船运动员进行科学训练有很好的应用价值。     

城域网以太网MAC-in-MAC技术研究与应用

以太网具有交换快速、配置简单的特点，所以越来越普遍地被应用在城域网和城域骨干网中。但广播域的分离、MAC地址表项过多及用户安全性等问题，是交换网络中的一些难以避免的问题。介绍了一种可较好地解决上述问题的新技术，即MAC-in-MAC技术，同时将它与已有的城域以太网技术VLAN技术和Q-in-Q技术进行了对比。最后，提出了2种实际网络中MAC-in-MAC技术的扩展应用。     

汽车助力转向系统异响问题分析研究

以某A0级轿车助力转向系统为研究对象,阐述了排查汽车转向系统异响问题的一般方法,之后对转向系统内关键部件的结构进行了分析,最后对各关键部件异响的形成机理进行了研究,形成了分析排查电动转向系统异响的一般流程,具有一定的参考意义。