拥挤收费下的路网交通评估模型研究

对城市实施拥堵收费策略的评估包括两个方面:一个是公共政策、经济环境、收费方式的技术可行性的评估;二是对拥堵收费区域内外的交通影响进行预估。文章在后一方面展开研究,利用交通网络分析的理论建立了拥挤收费下的交通网络评估模型,提出评估指标和求解算法。数值算例结果验证了评估模型以及算法的合理性,揭示了拥挤收费下收费区域内外交通模式变化的内在联系。表明只有将拥堵收费政策与城市良好的公交服务系统具体结合才能更好地起到减轻拥堵的预期效果。     

城市群轨道交通方式划分非集计logit模型

以城市群轨道交通方式划分为研究对象,根据城市群轨道交通特点,提出将城市群客流分为城区客流和城际客流,分别预测其轨道交通分担率.利用非集计模型的基础理论,选取时间、费用与个人收入的比值作为效用函数的特性变量,以交通行为调查的RP和SP联合数据为基础,建立了应用于城市群交通方式划分的非集计模型.并以长株潭城际轨道交通方式划分为例,进行了参数估计和轨道交通分担率的预测.     

基于绕行系数的交通可达性研究

为了评价不同路网形态下的城市道路可达性和对出行者的出行方式选择的影响,通过引入绕行系数的概念,对不同路网密度和交通管理策略的案例研究,说明可达性的变化对交通方式选择的影响。提出了基于绕行系数的可达性分析的基本思路,研究结果表明：仅以出行距离作为交通方式选择的影响要素条件下,可达性的改善有利于非机动出行方式分担率提高,合理的城市路网密度和适当的交通管理策略有利于多种交通方式共同发展。     

海上风力机安装技术研究(英文)

Wind power has made rapid progress and should gain significance as an energy resource, given growing interest in renewable energy and clean energy. Offshore wind energy resources have attracted significant attention, as, compared with land-based wind energy resources, offshore wind energy resources are more promising candidates for development. Sea winds are generally stronger and more reliable and with improvements in technology, the sea has become a hot spot for new designs and installation methods for wind turbines. In the present paper, based on experience building offshore wind farms, recommended foundation styles have been examined. Furthermore, wave effects have been investigated. The split installation and overall installation have been illustrated. Methods appropriate when installing a small number of turbines as well as those useful when installing large numbers of turbines were analyzed. This investigation of installation methods for wind turbines should provide practical technical guidance for their installation.     

利用片麻岩制备高等级路面沥青混合料研究

针对酸性集料沥青混合料水稳定性差的特点,采用不同抗剥落措施,研究各种方案下沥青混合料的水稳定性能。对比试验表明,常规水稳定性试验在评价酸性集料沥青混合料水稳定性方面明显缺乏有效性和区分度。而通过增加冻融循环次数、调整空隙率,以n次冻融循环劈裂强度比（TCSR（n））来评价沥青混合料抗水损害能力的改进法,可较客观地评价不同抗剥落方案的优劣性及耐久性,并准确地反映路面早期的水损害情况。     

沥青路面中结构参数的均值对路面可靠指标的影响

对沥青路面各项结构参数均值的变化给路面各项可靠指标造成的影响进行了较深刻的探讨     

干道信号协调控制优化方法

针对干道信号协调控制中控制策略及其控制优化参数设置上存在的问题,考虑到智能控制中Sugeno模糊推理所具有的复杂系统动态性能表达能力和神经网络控制方法所具有的学习能力,结合两者的优势建立了1种基于模糊神经网络的交通信号协调控制模型,实现对绿信比与相位差的优化,使用微观交通仿真软件Vissim对干线交通进行了仿真研究,仿真结果表明,该方法能更为有效地减小平均车辆延误。     

航道分流区横向流场分布特性

航道分流区横向流不利于船舶航行安全,分流区流场的影响因素需要深入研究。采用基于二维平均水深圣维南方程的水动力数学模型,研究了正交分流时分流区横向流场分布特性,分析了分流流量比和分流宽度比对横向流场分布的影响。结果表明,航道分流区横向流场呈现出"近密远疏"的分布特征,离分流口越近,横向流速越大且分布越密集;离分流口越远,横向流速越小且分布越稀疏。流速比和横宽比成较好的对数关系;随着分流流量比增大,横流占宽逐渐增大;随着分流宽度比增大,横流占宽逐渐减小。     

Reducing average comprehensive travel cost by rationally allocating trips to different travel modes

To study the effect of different transport policies on reducing the average comprehensive travel cost (CTC) of all travel modes, by increasing public transport modal share and decreasing car trips, an optimization model is developed based on travel cost utility. A nested logit model is applied to analyze trip modal split. A Genetic Algorithm is then used to determine the implementation of optimal solutions in which various transport policies are applied in order to reduce average CTC. The central urban region of Beijing is selected as the study area in this research. Different policies are analyzed for comparison, focusing on their optimal impacts on minimizing the average CTC utility of all travel modes by rationally allocating trips to different travel modes in the study area. It is found that the proposed optimization model provides a reasonable indication of the effect of policies applied.     

浅析输送带撕裂原因及应对措施

叙述了皮带输送机输送带撕裂的形式及原因,又介绍了国内外如何防止输送带撕裂及对输送带撕裂进行检测的措施,最后从技术角度提了几点建议,强调要进行新技术的开发与应用。