一种可车型分类的道路交通流检测系统研究与设计

研究与设计了一种基于感应线圈的道路交通流检测系统，采用32位ARM处理器与CPLD组成检测控制器，对车辆通过线圈时所产生的频率变化进行数据采集，克服了传统的8位单片机处理能力不足检测精度不够等设计缺陷。系统除具有通常的测量交通流量、车速、道路占有率等功能外，还可实时按车型分类统计车流量。     

京杭运河船型标准化的经济鼓励政策研究

本文介绍了京杭运河船舶运力的构成情况,分析了制定和实施京杭运河船型标准化经济鼓励政策的必要性以及产生的社会经济效益,提出了经济鼓励政策实施的方案,并对方案的实施效果作出分析。     

第二松花江桥跨度30 m简支T梁横向加固试验研究

通过对哈大桥上行第二松花江桥跨度30 m预应力混凝土简支T梁原桥的4种加固方法的动力试验研究,分析了桥梁在旅客列车及货物列车通过时跨中横、竖向振动规律,并从试验结果出发,对桥梁的加固方法进行了总结和探讨,提出了对既有线此类跨度铁路简支T梁的加固建议。     

Estimation of an integrated driving behavior model

This paper presents the methodology and results of estimation of an integrated driving behavior model that attempts to integrate various driving decisions. The model explains lane changing and acceleration decisions jointly and so, captures inter-dependencies between these behaviors and represents drivers’ planning capabilities. It introduces new models that capture drivers’ choice of a target gap that they intend to use in order to change lanes, and acceleration models that capture drivers’ behavior to facilitate the completion of a desired lane change using the target gap.The parameters of all components of the model are estimated simultaneously with the maximum likelihood method and using detailed vehicle trajectory data collected in a freeway section in Arlington, Virginia. The estimation results are presented and discussed in detail.     

A dynamic traffic assignment model for the assessment of moving bottlenecks

Moving bottlenecks in highway traffic are defined as a situation in which a slow-moving vehicle, be it a truck hauling heavy equipment or an oversized vehicle, or a long convey, disrupts the continuous flow of the general traffic. The effect of moving bottlenecks on traffic flow is an important factor in the evaluation of network performance. This effect, though, cannot be assessed properly by existing transportation tools, especially when the bottleneck travels relatively long distances in the network.This paper develops a dynamic traffic assignment (DTA) model that can evaluate the effects of moving bottlenecks on network performance in terms of both travel times and traveling paths. The model assumes that the characteristics of the moving bottleneck, such as traveling path, physical dimensions, and desired speed, are predefined and, therefore, suitable for planned conveys.The DTA model is based on a mesoscopic simulation network-loading procedure with unique features that allow assessing the special dynamic characteristics of a moving bottleneck. By permitting traffic density and speed to vary along a link, the simulation can capture the queue caused by the moving bottleneck while preserving the causality principles of traffic dynamics.     

大众汽车创新战略对行业发展的启示

通过对大众汽车集团创新资源配置与管理的分析,提出国内企业在加大研发投入的基础上,制定合适的研发战略是关键,企业结盟是有益的补充.     

Intrusions of eastern North Atlantic central waters and phytoplankton in the north and northwestern Iberian shelf during spring

The influence of intrusions of eastern North Atlantic central water (ENACW) in the north and northwestern Iberian shelf on phytoplankton composition and abundance and on particle-size distributions of seston was analyzed using data collected on three extensive cruises during spring 1991 and 1992. Water with temperature and salinity values between 12.20 and 13.86 °C and between 35.66 and 35.98 psu, respectively, characteristics of the subtropical type of ENACW (ENACW_t), was detected in the upper 100 m of the water-column in all cruises, but particularly in the western coast in 1992. The highest salinity values of this water were found near the surface (0–100-m depth) and in early spring 1992, while minimum salinity values, and also minimum geographical extension, were found in late spring in both years. Phytoplankton blooms concentrated in frontal areas between different water types, with maximum intensity and extension in early spring.Using temperature and salinity characteristics, samples were classified in four groups corresponding to the major water types found in the region: Bay of Biscay central water (BBCW), two segments of ENACW of different salinity and surface water influenced by continental runoff. This classification was significantly confirmed by three independent discriminant analyses using hydrographic and chemical (dissolved nutrients and chlorophyll) variables, phytoplankton species abundance variables and particle-size concentration of seston variables. Phytoplankton blooms related to the presence of saline waters were characterized by the dominance of either chain-forming diatoms or a mixture of diatoms and phytoflagellates and high concentrations of seston. The diatom species dominating in saline waters were typical of upwelling-induced blooms occurring generally during summer. Blooms occurring in waters influenced by runoff also contained diatoms but in lower numbers than those of saline waters. Nutrients were not exhausted in the region, suggesting that phytoplankton populations were still in active growth. These results are interpreted taking into account the known variability in water-mass formation and in the poleward current driving ENACW_t along the shelf, and indicate that saline intrusions are a major feature affecting the distribution and composition of plankton in the spring in the southern Bay of Biscay, thus enlarging to a wider spatial scale their reported influence on the pelagic ecosystem.     

朔黄铁路K44滑坡整治设计

朔黄铁路K44+940～K45+050以半填半挖形式通过马圈滑坡,经线路方案比选后,以整治滑坡方案通过。针对马圈滑坡特征,进行滑坡整治综合分析,在采用多种勘探手段取得详细地质资料基础上,反算确定出滑坡物理、力学指标,根据计算确定出线路左侧采用12根,线路右侧采用17根抗滑桩及桩板墙、衡重式路肩墙、重力式路堑挡土墙、护墙、护坡、加强滑坡区及路基的防排水等综合性防护工程措施。     

工程弃碴改良膨胀土路堤的实验研究

通过室内试验、现场检测 ,利用工程弃碴改良膨胀土路堤的工程特性进行研究 ,给出改良土的最佳配合比 ,合理摊铺厚度以及压实工艺。现场实施表明经济有效、满足质量要求     

防止铝质舰载设备电偶腐蚀的对策

针对铝质舰载设备常年处于高湿度、高盐分、污染重的环境中，腐蚀问题非常严重的现象，介绍了铝及铝合金电偶腐蚀的形成原因及过程，详细分析了造成电偶腐蚀的各种因素，并提出了相应的对策，对类似的铝及铝合金产品的开发具有现实借鉴意义。