水泥混凝土路面填缝料封水试验方法研究

水泥混凝土路面填缝料发生接缝破损或密封性不好时地面水会从接缝处渗入基层进而产生唧泥、错台、不平整和板块断裂,导致水泥混凝土路面破坏.国内还没有相关规范验证填缝料的封水性能.基于水泥混凝土路面填缝料封水性能的室内试验及现场试验,研究并提出可检测水泥混凝土路面填缝料封水性能的试验方法,为填缝料的开发、设计、施工与验收提供依据.     

滑动摩擦副表面强化工艺措施对比试验

采用MPX-2000盘销式摩擦磨损试验机,对调质处理、高频淬火处理、软氮化处理、硬氮化处理、激光淬火处理5种滑动摩擦副表面强化工艺措施进行了表面抗咬合性能和表面耐磨损性能对比试验．试验研究结果表明,激光淬火处理和软氮化处理工艺对滑动摩擦副表面强化效果好与较好,可用于高速重载且重要的零部件表面强化．硬氮化处理工艺表面强化效果中等,可用于中等载荷条件下零件表面强化．调质处理工艺对滑动摩擦副表面强化效果较差,可用于载荷较小的非重要零部件表面强化．高频淬火处理工艺试件的抗咬合能力差,不宜采用．     

自升式钻井船圆柱桩腿强度研究

本文介绍了自升式钻井船圆柱桩腿在垂向载荷作用下的强度问题,着重讨论了桩腿开孔强度和桩腿承载能力,供设计参考。     

The influence of travel time variability on the value of time

Current benefits from travel time savings have only been related to the benefits from reducing mean travel time. Some previous attempts of including variability in the generalised cost function have mainly assumed commuters with fixed arrival time. This paper presents a comprehensive framework for valuing travel time variability that allows for any journey purpose and arrival time constraint. The proposed model is based on the expected utility approach and the mean-standard deviation approach. Stated Preference methods are considered the best technique for providing the data for calibrating the models. The values of time derived from the models are highly influenced by the value of travel time variability and it strongly depends on the probability distribution function travellers are faced with.     

废食用油代用燃料在柴油机上的试验研究

食用植物油是一种很有前途的代用燃料,它是利用植物的光合作用不断更新生产的一种能源。通过用废食用油制得的柴油机代用燃料,在小型高速柴油机上与0号柴油做了性能对比试验。试验结果表明,与燃用柴油相比,用废食用油作为代用燃料输出功率几乎相同(仅低2%),燃油消耗增加了6%~12%,排气温度降低了20℃,所排出的CO2降低了10%~15%,CO降低了10%~18%,HC降低了47%。     

国外 UUV拖曳声呐试验情况分析

本文描述了 SLITA和微型 SLITA接收声信号试验和噪声分析过程及结果,并绘制接收声信号模块图。同时,描述了 TOSSA收发声信号试验及分析过程和结果,并绘制发射声信号模块图和建立声信号单程传输基本模型。     

镁合金方向盘疲劳试验的计算机模拟

通过利用有限元技术对镁合金方向盘疲劳试验的主要过程加以模拟,分析产品的几种主要受力状态。作为模拟分析的重要技术,CAE可以进行高效、快速的分析,便于对试验结果做出预先判定、优化产品设计。     

Experimental Study of Effects of Travel Time Distribution Information on Dynamic Route Choice Behavior

This study focuses on the possibility that providing travelers with information on travel time distribution, along with the existing travel time information, might affect their decision making and enhance traffic control. As an initial step to confirm the effectiveness of travel time distribution information, we use a laboratory experiment to obtain panel data of route choices when information is provided. The rationality of the behavior of the respondents and the characteristics of the route choice are first analyzed by aggregation analysis and then statistically examined by specifying a mixed logit route choice model. As a result, it is revealed that both travel time information and maximum travel time information significantly affect route choice behavior when a penalty is imposed for late arrival.     

The effects of social networks on choice set dynamics: Results of numerical simulations using an agent-based approach

Activity-based analysis has slowly shifted gear from the analysis of daily activity patterns to the analysis and modeling of dynamic activity-travel patterns. In this paper, we address one type of dynamics: the formation and adaptation of location choice sets under influence of dyad relationships within social networks. It extends the dynamic model developed in earlier work, which simulates habitual behavior versus exploitation and exploration as a function of discrepancies between dynamic, context-dependent aspiration levels and expected outcomes. Principles of social comparison and knowledge transfer are used in modeling the impact of social networks through information exchange, adaptations of spatial choice sets and formation of common aspiration levels. We demonstrate model properties using numerical simulation with a case study of shopping activities.     

车载接触网运行状态检测装置系统设计及应用

接触网作为电气化铁路牵引供电的关键设备,其状态好坏直接影响铁路运行安全。为了在运营动车组上装备一套接触网运行状态检测装置对接触网运行状态进行全程监控,从系统的设计要求、设计原则、设计方案着手,引入非接触式的图像处理、机器视觉以及红外测温关键技术,完成装置的系统设计,同时通过静态和动态试验验证装置的性能。试验和现场的实际应用反馈表明,装置满足技术条件要求,同时装置对接触网的检测结果能够为接触网检修提供依据。