某型轿车用点烟器外套多工位级进模设计

通过对某型轿车用点烟器外套进行工艺性分析与计算,将原来需要3副模具才能完成的外套零件冲压工艺整合到1副多工位级进模上完成.经试验和生产应用表明,新工艺与模具设计合理,降低了模具制造成本,提高了生产效率.     

Energy management and design optimization for a series-parallel PHEV city bus

Series-parallel PHEV city buses combine the advantages of series and parallel configurations and have been used in China. However, the design and energy management of series-parallel PHEV city buses based on Chinese driving conditions still need to be investigated. In this paper, an equivalent consumption minimization strategy is provided to optimize energy management for series-parallel PHEV city buses, and the process of the equivalent consumption minimization strategy for series-parallel is presented in this paper. Compared with the validated rule-based energy control strategy, ECMS shows a fuel economy improvement of 8.2 % in the CBCD (Chinese Bus Driving Cycle). Based on the optimal energy management, a design for a generator motor in the series-parallel configuration has been processed. The fuel consumption has been shown to decrease, with an increase in generator power, because the system with the higher generator power can work at a higher efficiency in the series mode and operate the engine in the high efficiency area in the parallel mode. Besides, in terms of costof- ownership for a PHEV bus for lifetime of 8 years, although the high generator power will lead to high purchase cost for series-parallel PHEV bus, a series-parallel PHEV city bus with a generator of 100 kW maximum power will still show small advantage in cost-of-ownership, based on current motor price and natural gas price.     

预应力混凝土连续箱梁桥腹板主拉应力的计算与分析

以湖北随岳中汉江特大桥南岸堤桥为工程背景，采用有限元软件对该桥控制截面施工阶段以及运营阶段的箱梁腹板进行主拉应力的计算和分析。结果表明，主拉应力值都在规范允许值之内，为该桥在施工及运营过程中腹板是否产生斜裂缝以及结构使用的安全可靠性提供了理论依据。     

利用设计模式提高移动GIS复用性的一种新方法

为了提高移动GIS系统的复用性,提出一种基于设计模式的GIS软件设计方案.针对系统用户界面交互复杂的问题,提出采用COMMAND(命令模式)封装的解决方法;引入STRATEGY(策略模式)实现可互换的电文解析算法族;对于网络通讯代码复杂耦合度高的问题,提出应用FACTORY(工厂模式)降低配置代码与事件服务器之间耦合度的解决方法;针对嵌入式环境下显示速度慢的问题,采用VISITOR(访问者模式)和四叉树结构相结合的多尺度显示策略.实践证明,设计模式降低GIS系统各模块之间的耦合度,提高系统的可扩展性.     

军事通信资源竞争机制初探

资源竞争现象在各种通信网络中都有一定程度的存在.在分析多种资源竞争解决机制和军事领域特点的基础上,探讨资源竞争处理机制在军事通信中的应用,并进一步指出以后的主要研究方向.     

浅谈天津港船闸通航状况与安全管理

VTS可依据有关规定适时对过闸船舶的计划进行调整。利用现有的监控设备,随时掌握进出船闸的船舶动态和船闸两侧船舶候闸的数量。高效、有序地组织船舶安全顺利的过闸。     

推进中国网通创新转型之我见

本文从观念转变、网络建设、市场调研、人力资源开发、四个环节阐述了如何推进中国网通创新转型。     

Adaptive traffic signal control using approximate dynamic programming

This paper presents a study on an adaptive traffic signal controller for real-time operation. The controller aims for three operational objectives: dynamic allocation of green time, automatic adjustment to control parameters, and fast revision of signal plans. The control algorithm is built on approximate dynamic programming (ADP). This approach substantially reduces computational burden by using an approximation to the value function of the dynamic programming and reinforcement learning to update the approximation. We investigate temporal-difference learning and perturbation learning as specific learning techniques for the ADP approach. We find in computer simulation that the ADP controllers achieve substantial reduction in vehicle delays in comparison with optimised fixed-time plans. Our results show that substantial benefits can be gained by increasing the frequency at which the signal plans are revised, which can be achieved conveniently using the ADP approach.     

探讨新、旧城区的房地产开发投资

随着经济的发展,城市的建设速度越来越快,就其房地产开发投资而言,新城、旧城因其不同的地理位置、自然环境、人口环境和文化环境而各有优劣,两城区的优点和劣势也将影响和改变房地产开发的投资方面,文章将从以下几个方面进行探讨。