关于高速公路收费车道控制技术柜内部结构的探讨

基于高速公路收费车道设备的使用频率高、所处环境恶劣、故障率相对较高的实际特点,探讨了收费车道控制技术柜内部结构的设计要求,并介绍了实际工程应用中车道技术柜的功能模块。     

承台大体积混凝土裂缝控制技术措施

结合桥梁大体积的现场施工,分析了桥梁结构中大体积混凝土产生裂缝的原因,并提出防止裂缝的主要技术措施。     

航道疏浚工程施工浅点成因与控制分析

文章结合龙圩水道航道疏浚工程施工实例,着重从水下钻孔爆破作业方面,分析航道疏浚工程施工中出现浅点的主要原因,并提出相应的预防控制措施。     

The influence of integrated space–transport development strategies on air pollution in urban areas

The phenomenon of urban sprawl has strong impacts on transport performance and accessibility and causes an increase of air pollution. Effective control of urban sprawl requires an integrated approach comprising urban transport and land-use planning. Current research is insufficient to demonstrate the effects of urban sprawl on travel behavior and air pollution emission. The present paper examines the potential of an integrated approach on space–transport development strategies with the aim of increasing accessibility and reducing air pollution. A combination of space and transport strategies has been simulated for the rapidly expanding city of Surabaya. A comparative analysis of the impact of those cases indicates the promising potential alternatives to minimize the phenomenon. The transport options considered are combinations of Public Transport (PT), comprising Mass Rapid Transit (MRT), Light Rapid Transit (LRT), and Bus Rapid Transit (BRT). The options for urban structure include a compact zone development for the city, as formulated by the city planning agency, and a polycentric city set-up based on a job-housing balance aimed at minimizing the house-job distance. The results indicate that the polycentric city structure has the potential to make public transport work successfully for the city of Surabaya. This city structure creates a trip demand pattern which matches citizens’ PT preferences. Compared to the current situation, the combination of such a city structure with an expansion of PT systems would lead to a considerable improvement of transport performance, i.e. a PT mode share, a mean commute distance, and a significant reduction in emissions.     

长山东水道跨海大桥桥型方案比选

通过长山东水道跨海大桥工程主要控制因素分析,初步选择的桥型方案。介绍了方案比较过程,确定出合理的桥型方案。     

流线型列车头部外形设计方法

基于流线型的列车头部外形由三维空间自由曲面构成,提出采用NURBS曲线设计外形型线和用三维NURBS曲面描述复杂三维曲面的车头外形设计方法。按照流线型列车头部外形的设计要求,首先生成基本控制型线,根据需要自动生成中间控制型线;对一些型线进行空间动态修改,使所有控制型线构成空间网状结构;将这些控制型线在空间的交点处断开,形成首尾相连的NURBS曲线段;自动将首尾相连的NURBS曲线段连接形成外形曲面片,并保证曲面片在空间相切;最后对外形曲面进行光顺性检查,得到最终的外形曲面。运用NURBS曲线曲面的数学模型,在AutoCAD的ARX及I-deas的Open I-deas开发平台上,开发了流线型列车头部外形设计模块,实现了按照人们的意志,自由、快速地设计复杂的空间三维曲面流线型列车外形。     

Compact PCI计算机在测控系统的应用

介绍了基于Compact PCI总线的测控系统的总体设计方案、硬件结构和软件设计。该测控系统具有实时、准确、操作简便、抗冲击振动的特点,为某装置的研制带来极大地便利。     

船舶实时综合监控系统设计

为了实现船舶驾驶台和机舱的综合集成监视和控制,实现全船一体化管理,本文结合相关项目的研究与开发,给出了整个监控系统的设计方案。文中着重论述了该系统的软硬件和界面设计情况、并对其中的一系列关键问题做了相应的解决。     

路桥过渡段沉降控制指标的研究

桥头跳车是由于桥台和台背路基产生差异沉降而造成的,因此路桥过渡段容许差异沉降是预防桥头跳车的一个关键问题。本文参照汽车平顺性评价方法,建立3个自由度的车辆-人体-座椅的振动模型,对台背不同差异沉降对行车舒适性的影响进行分析,并结合相关文献资料的结果,提出了路桥过渡段沉降的控制标准。