水泥混凝土路面板下地基脱空状况的评定与分析

以重复荷载下的接缝工作特性为基础,通过对第一传荷状态临界荷载及其对应弯沉影响因素的分析,指出脱空对弯沉的影响是显著的,并提出以第一传荷状态临界荷载与对应弯沉为指标的脱空评定模型与评定方法,使评定工作在单板系统基础上进行,排除了接缝传荷状况不确定的影响。最后,给出脱空尺寸与弯沉典型回归关系式,从而能够利用FWD对水泥混凝土路面板下脱空进行快速评定。     

Real-time traffic state estimation in urban corridors from heterogeneous data

In recent years, rapid advances in information technology have led to various data collection systems which are enriching the sources of empirical data for use in transport systems. Currently, traffic data are collected through various sensors including loop detectors, probe vehicles, cell-phones, Bluetooth, video cameras, remote sensing and public transport smart cards. It has been argued that combining the complementary information from multiple sources will generally result in better accuracy, increased robustness and reduced ambiguity. Despite the fact that there have been substantial advances in data assimilation techniques to reconstruct and predict the traffic state from multiple data sources, such methods are generally data-driven and do not fully utilize the power of traffic models. Furthermore, the existing methods are still limited to freeway networks and are not yet applicable in the urban context due to the enhanced complexity of the flow behavior. The main traffic phenomena on urban links are generally caused by the boundary conditions at intersections, un-signalized or signalized, at which the switching of the traffic lights and the turning maneuvers of the road users lead to shock-wave phenomena that propagate upstream of the intersections. This paper develops a new model-based methodology to build up a real-time traffic prediction model for arterial corridors using data from multiple sources, particularly from loop detectors and partial observations from Bluetooth and GPS devices.     

广西坛百高速公路有限公司企业文化建设思路初探

文章从广西坛百高速公路有限公司企业文化建设的必要性入手,分析了公司企业文化建设的优势,阐述了当前公司企业文化建设所面临的问题,并初步探讨了企业文化建设的基本思路。     

热力学第一定律在估算柴油机冷却水量中的应用

针对柴油机冷却水系统,提出一种估算冷却水量的计算方法.     

基于一阶优化方法的桥式起重机结构有限元分析

针对桥式起重机桥架结构设计计算，采用一阶优化分析方法对其桥架结构的约束条件以及目标函数进行优化处理，研究结构的强度、刚度等静态特性，并对优化后的结果与优化之前的数值进行对比分析，充分地验证了一阶优化方法的优越性。     

达布定理的一个应用

应用达布定理,纠正了不定积分计算中的一个错误。     

基于UML2.0活动图的车载设备测试用例生成方法研究

重点研究基于UML2.0活动图的CTCS-2级车载设备测试用例生成方法.介绍车载设备的构成和功能,对活动图进行形式化定义,阐述测试用例的设计,包括车载设备活动图建模规则、测试用例的形式化定义、测试覆盖准则的定义、基于深度优先搜索并且带回溯的遍历算法的测试场景生成,以及测试用例的生成算法,最后实现了测试用例生成.     

基于Bro的蠕虫检测系统设计及实现

在分析蠕虫传播机制基础上,基于入侵检测系统Bro的整体框架,以基于FCC（First Contact Connections,第一次连接）失败概率和重尾特性的蠕虫检测算法为核心,设计并实现了基于Bro的蠕虫检测系统。该系统对Bro的策略脚本解释器进行扩充,实现上述检测算法的策略脚本,将检测结果输出到共享内存,基于SNMP协议,将检测结果传送至监视端,方便用户对网络蠕虫的实时监视。该系统能够迅速准确地检测出网络上的蠕虫主机。     

用二阶弹性分析法计算油缸的稳定性问题

液压油缸是机械液压传动系统中的重要执行元件。本文对传统受压油缸稳定临界力的计算方法与二阶弹性分析法进行比较并举例说明,采用二阶弹性分析法进行屈曲分析更加准确,必将在今后油缸的设计和稳定性校核有广泛应用。