城市轨道交通站前交替折返间隔分析及计算方法

描述了站前交替折返的作业流程,分析了时序上的限制关系,推导出站前交替折返的停站时间、发车间隔等参数的计算公式,并对特殊情况进行了分析。     

台背回填材料研讨

以工程事例为材料，讨论了一些取材方便，性能稳定，能够用做台背回填的材料。     

人工神经网络在舰船火灾探测中的应用

舰船火灾探测系统的目的是能及时、准确地探测到舰船上发生的火灾。提出一种利用人工神经网络的舰船火灾探测方法，通过设计三层反向传播（BP）人工神经网络模型，使用改进的BP算法——LM算法，对多传感器（温度传感器、烟雾传感器和CO传感器）同时探测到的数据进行智能化处理。仿真结果表明：基于人工神经网络的舰船火灾探测系统能及时、准确地识别各种火灾信号。     

谈如何在施工中控制好台背回填的质量

桥头跳车是我国目前已交付使用的高速公路存在的较为普便的现象,从论述台背沉降形成的原因、危害以及从施工方面采取的质量控制措施来预防桥头跳车现象。     

Accidents involving pedestrians with their backs to traffic or facing traffic: an evaluation of crash characteristics and injuries

This paper examines pedestrian anatomical injuries and crash characteristics in back‐to‐traffic and facing‐traffic crashes. Pedestrian crashes involving pedestrians walking along streets (i.e. with their backs to traffic or facing traffic) have been overlooked in literature. Although this is not the most frequent type of crash, the crash consequence to pedestrians is a safety concern. Combining Taiwan A1A2 police‐reported accident data and data from the National Health Insurance Database from years 2003–2013, this paper examines anatomical injuries and crash characteristics in back‐to‐traffic and facing‐traffic crashes. There were a total of 830 and 2267 pedestrian casualties in back‐to‐traffic and facing‐traffic crashes respectively. The injuries sustained by pedestrians and crash characteristics of these two crash types were compared with those of other crossing types of crashes (nearside crash, nearside dart‐out crash, offside crash, and offside dart‐out crash). Odds of various injuries to body regions were estimated using logistic regressions. Key findings include that the percentage of fatalities in back‐to‐traffic crashes is the highest; logistic models reveal that pedestrians in back‐to‐traffic crashes sustained more head, neck, and spinal injuries than did pedestrians in other crash types, and unlit darkness and non‐built‐up roadways were associated with an increased risk of pedestrian head injuries. Several crash features (e.g. unlit darkness, overtaking manoeuvres, phone use by pedestrians and drivers, and intoxicated drivers) are more frequently evident in back‐to‐traffic crashes than in other types of crashes. The current research suggests that in terms of crash consequence, facing traffic is safer than back to traffic. Copyright © 2016 John Wiley & Sons, Ltd.     

自发光式交通标志亮度与对比度的研究

自发光式交通标志的亮度和对比度是影响自发光式交通标志视认性的重要因素。本文总结了国内外一些实验研究结论,结合交通标志设计中人体视觉行为的特征,对自发光式标志的亮度、对比度进行了分析,提出了自发光式交通标志最佳亮度范围与对比度值,对自发光式交通标志设计具有参考价值。     

粉砂质海岸泥沙淤积的研究

本文从水流动力学及泥沙运动学的基本原理出发.分析了粉砂质海岸泥沙运动的特性,指出,粉砂质海岸的泥沙运动兼有悬移和推移两种形态,悬移与推移运动强度既与水流强度有关.也与泥沙的组成有关,本文从水流的能量分配入手,重点阐述了二者的相对量,同时,给出了粉砂质海岸淤积量的计算公式.     

基于STAR-CCM＋的某型车SCR系统流场分析

借助STAR-CCM＋软件,分析了某型车SCR后处理系统在额定工况下的压力场和速度场分布,以及不同尾气流量下排气背压的变化,得到排气背压随着尾气流量的变化,规律,最后利用最小二乘法,得到尾气流量与排气背压的关系式。该方法为SCR系统的设计提供了有效的理论依据。     

基于尺寸工程解决后座椅靠背装配问题

新车型开发总装过程中座椅靠背装配困难,靠背翻转中与侧围饰板干涉导致面套起皱。本文通过对相关零件尺寸调查,绘制尺寸链了解影响装配困难和翻转干涉的主要因素,包括功能尺寸、定位、公差分配,进而推导设计是否合理。通过实例的阐述,对尺寸工程在总装工艺工作中的应用有指导意义。     

大气散射对激光制导武器对抗影响研究

为了避免大气散射给激光制导武器对抗带来的不利影响,利用激光信号在近地大气中传输的Mie散射模型,讨论了气溶胶霾粒子引起的能量衰减和后向散射能量密度的计算方法,数值模拟了激光制导武器最大作用距离与大气能见度之间的关系,定量计算了激光目标指示器与导引头不同距离时的激光大气后向散射能量密度,结合场区条件给出了配置点位的具体要求,为激光制导武器对抗态势构建提供参考依据.