轿车与6岁儿童行人不同方位碰撞中下肢损伤分析

Euro NCAP发布的行人模型认证技术公告TB024的最新版本对6岁儿童行人模型认证提出了单独要求,旨在加强对儿童行人的保护.本研究应用符合Euro NCAP技术公告(TB024)规定并且具有详细解剖学结构的6岁儿童行人有限元模型,设置了4组不同方位行人-汽车碰撞仿真试验,以探究不同碰撞方位下的儿童下肢损伤机理.结果...     

电力补偿系统在轮胎式集装箱门式起重机上的应用

目前大部分轮胎式集装箱门式起重机都是由发动机-发电机组提供电能,其电力系统为独立系统,不与电网相连,多余的电能不能回馈给电网.起重机在装卸作业时,起升、大车、小车三大机构的拖动电动机都有工作在制动状态的情况.     

红色歌谣研究综述

在回顾20世纪80年代中后期以来红色歌谣在历史、文学、传承和人物等领域的研究现状的基础上,提出红色歌谣研究与现实社会生活相互动的方向,实现研究空间拓展,研究方法创新和研究导向的现实介入.     

Collection, spillback, and dissipation in pedestrian evacuation: A network-based method

We present a method of predicting pedestrian route choice behavior and physical congestion during the evacuation of indoor areas with internal obstacles. Under the proposed method, a network is first constructed by discretizing the space into regular hexagonal cells and giving these cells potentials before a modified cell transmission model is employed to predict the evolution of pedestrian flow in the network over time and space. Several properties of this cell transmission model are explored. The method can be used to predict the evolution of pedestrian flow over time and space in indoor areas with internal obstacles and to investigate the collection, spillback, and dissipation behavior of pedestrians passing through a bottleneck. The cell transmission model is further extended to imitate the movements of multiple flows of pedestrians with different destinations. An algorithm based on generalized cell potential is also developed to assign the pedestrian flow.     

Behavior-consistent service substitutions in dynamic environments

In this paper, a novel approach for service substitutions based on the service type in terms of its interface type and behavior semantics is proposed. In order to analyze and verify behavior-consistent service substitutions in dynamic environments, we first present a formal language to describe services from control-flow perspective, then introduce a type and effect system to infer conservative approximations of all possible behaviors of these services. The service behaviors are represented by concurrent behavior expressions （CBEs）. Built upon the interpretation of CBEs, behavior-consistent service substitutions are defined and analyzed by subtyping technology. The correctness of the analysis approach is guaranteed by type safety theorem, which is mechanically proved in the Coq proof assistant. Finally, applications in web services show that our method is effective and feasible.     

8m长低入口城市客车的开发

国内已开发出多种11-12m长的低入口城市客车,而市场需求量大的8m长低入口城市客车还是空白.本文应用轮顶悬架前桥及短后悬结构专利技术,成功开发出低成本的8m长短后悬低入口城市客车.     

舰船物资转运方案计算机辅助决策算法研究

瞬息万变的现代战场对大中型水面战斗舰船甲板物资转运的效率提出越来越高的要求。引入计算机辅助决策技术,在考虑多种牵制因素的情况下,快速获得最优的物资转运方案。详细分析和阐述舰船物资转运线路规划、时间计算、作业排序以及资源配班等4个主要问题的计算机解决方法,为利用计算机辅助制定最优物资转运方案提供可行途径。     

车辆无线电遥控装置自适应波特率的设计和实现

本文介绍了车辆无线电遥控装置自适应波特率的设计和实现,该无线电遥控装置实现了软件自适应修正波特率偏差从而减小无线电遥控装置引入的系统误差和相邻信道的无线电干扰,提高了装置的稳定性,扩大了遥控装置的工作范围。     

桥墩盖梁加固设计与施工探讨

以实际工程为背景，探讨了体外预应力加固桥墩盖梁的方法，经过优化设计采用钢锚梁进行预应力锚固。介绍了钢锚梁的具体构造，采用土木仿真有限元软件模拟分析，对盖梁混凝土承载能力、正常使用和持久状况应力、钢锚梁强度和稳定性进行研究，研究结果验证了加固措施的合理性，探讨了加固施工工艺。     

南宁市交通管理和控制系统优化方案分析工具的建立

交通仿真是采用计算机数字模型来反映复杂的交通现象,对交通运动随时间和空间的变化进行跟踪描述和分析。不同精度的交通仿真模型有不同的优缺点,要客观的评估城市的交通管理和控制系统优化措施,应将不同精度的模型配合,作为分析工具。本次研究采用中宏观的SATURN作为主导模型,对南宁市的宏观的交通进行整体分析,以及对不同交通改善方案进行评估。选用TSIS、SYNCHRO交通仿真软件作为辅助的交通分析工具,对局部地区的交通及信号配时作较为具体的分析,以利于本研究针对各种建议方案进行客观性的整合分析与应用。