以HCCI燃烧过程为主要研究对象的模拟燃烧系统

所论述的模拟燃烧系统是针对均质混合气压燃特性试验研究开发研制的装置,主要由燃烧系统主体部分、混合气配给系统等组成。该装置具备定压燃烧过程、复合燃烧过程以及定容燃烧过程的研究试验功能,且具有良好的边界条件可控性。燃烧系统压缩终了压力可达到2.6MPa,活塞最高速度为5m/s,平均速度为2.18m/s。     

排水系统水力模型建模导则有关规定的探讨

排水系统水力模型在排水工程项目中的应用越来越广泛,制定一套关于排水系统水力模型的标准和规范是必要的。根据编制《排水系统水力模型建模及交付技术导则》中的要求,以集水区和降雨作为研究对象,采用水力模型对集水区和降雨进行建模模拟,分析研究集水区和降雨对排水系统水力模型的影响,证明《排水系统水力模型建模及交付技术导则》中关于集水区和降雨在排水系统水力模型中的建模要求的合理性,为导则的后续应用提供了有力的技术支持,也为后续排水系统水力模型的建设提供相应的指导。     

客运专线土质路基地段铺设无碴轨道调研及分析

介绍无碴轨道的特点,高速铁路发达国家以及国内研究、应用现状及土质路基地段铺设无碴轨道的技术条件;结合现行客运专线有碴轨道设计规范的有关规定,初步提出客运专线土质路基地段铺设无碴轨道的技术条件,就需深入研究的问题进行了讨论。     

深圳地铁14号线黄木岗站三线换乘方案研究

深圳地铁14号线黄木岗站与既有7号线、近期规划24号线黄木岗站形成地下三线换乘车站，车站周边环境复杂。如何综合各种边界条件形成建筑功能完善，结构经济安全，同时又对周边环境影响最小的方案是本站研究的重点，特别是车站站位及换乘功能的研究。方案设计过程中，通过逐一梳理地面建筑、地下建(构)筑物、地面交通、片区规划、工程地质条件、客流预测、车站换乘功能等边界条件，总结黄木岗站立交桥安全、交通疏解、管线改迁、结构工法、施工器具选择、车站站位及换乘功能等重难点，采取逐项突破的方法，最终推演出“干”字形节点换乘方案，其中14号线采用地下3层双叠侧式车站，与7号线形成平行同台换乘，与24号线形成台-台换乘。     

氯离子在混凝土中渗透行为的研究

文章在干湿循环和全浸泡两种条件下，研究了氯离子在混凝土中的渗透性能，并考虑扩散系数随时间变化的因素．为准确地预测实际工况混凝土结构的使用寿命提供参考。     

三峡枢纽泄洪、船闸输水及电站调峰对通航条件的影响

回顾了三峡枢纽通航水流条件的研究工作,介绍了研究的进展和取得的成绩,指出了存在的问题和努力的方向。     

Modelling the impact of weather conditions on active transportation travel behaviour

Three weather sensitive models are used to explore the relationship between weather and home-based work trips within the City of Toronto, focusing on active modes of transportation. The data are restricted to non-captive commuters who have the option of selecting among five basic modes of auto driver, auto passenger, transit, bike and walk. Daily trip rates in various weather conditions are assessed. Overall, the results confirm that impact of weather on active modes of transportation is significant enough to deserve attention at the research, data collection and planning levels.     

基于ADAMS的舰载补给起重机摇摆仿真及减摇措施分析

舰载补给起重机吊运柱状箱体时,箱体会由于各种外界影响发生摇摆。针对舰载补给起重机起吊的柱状箱体在舰船摇荡、起重机启停、风载的影响下发生的摇摆进行了ADAMS动力学仿真,得到了这3种因素对柱状箱体摇摆的影响情况,以及柱状箱体在预设工况下的运动规律。改变钢丝绳数量和布置形式进行仿真,得到了不同钢丝绳数量和布置下柱状箱体的运动情况以及相对单根钢丝绳的减摇效果,为进行动基座起重机减摇、防摇研究提供了依据。     

冰雪条件下中国驾驶员跟驰行为及模型研究

分析驾驶员在冰雪条件下的驾驶行为特性,建立考虑驾驶员行为特性的跟驰模型,有助于丰富现有交通流理论.通过招募驾驶员开展实车跟驰试验,对比分析正常条件与冰雪条件下的驾驶行为差异.进而基于任务难度均衡理论构建包含人类因素参数的任务难度模块,引入改进后的智能驾驶员模型,并采用车辆轨迹数据对模型进行标定和有效性验证.研究表明：驾驶员在跟驰行驶过程中受外界刺激及自身驾驶能力影响时会对车辆行驶状态进行动态调整,试图保持期望间距,且速度与前车一致的状态;冰雪条件下驾驶员采取风险补偿行为,其车头时距波动幅度较正常条件收窄,模型引入人类因素参数可以较好地描述其差异性. 模型有效性验证表明,新模型在6个仿真场景中的表现都优于传统智能驾驶员模型,且表现出更好的鲁棒性.研究结果可为冰雪条件下的交通管理措施制定提供理论支持.     

Are French millenials less car-oriented? Literature review and empirical findings

Generation effects play a key role in shaping long-term trends in travel behaviors. Though cohorts born until the 1970s have been increasingly car-focused, a reversal of this trend was noticed among the millenials. Determining whether this break-in-trend resulted from changes in living conditions and economic difficulties, or demonstrates a shift in attitudes away from the car, is critical to future travel trends. We bring a contribution to this debate in the French context, through a literature review followed by empirical findings, using the French Base of Local Household Travel Surveys. Through age-cohort analysis, we find evidence of changing travel patterns among the millenials, taking the form of a shift from driving to transit, along with a decline of car ownership. However, travel attitudes of the millenials play little role, as they do not differ substantially from their elders. Besides, we show that generation effects disappear once a large number of structural factors are controlled for. It looks like the main driver of change in travel behaviors comes from a shift in residential patterns, in relation with longer studies and a delayed entrance into the workforce, and possibly because of increasing work pressure, degraded transport conditions and changes in residential attitudes and desired lifestyles. In the end, these assumptions should be further explored, along with complementary research tracks, including the role of economic factors, the effects of learning experience, as well as heterogeneity in travel patterns, in relation with issues of social and spatial equity.