汽车尾部信号灯具光学实现方式概述

阐释了部分当前行业内较新的光学实现方式,当前尾部信号灯的基础理念依旧是在满足相关配光法规的前提下,将其外观尽可能地做得更加美观、个性化;对各类光学实现方式的设计原理及技术难点加以剖析,探讨各类设计的优缺点及应用;结合行业特点及当下技术发展情况,展望了未来的光学实现方式,并预测未来汽车尾部信号灯具将在造型、光源、功能等3个方面实现突破。     

Development and prospects of key technology for submarine atmospheric environment control北大核心CSCD

Air regeneration, harmful gas purification and atmospheric composition monitoring are the key technologies of submarine atmospheric environment control systems. After years of development, China has made great progress in such systems, which have developed from ensuring the safety requirements of submariner and equipment operation to ensuring the health of submariner and reliability of system for long-term underwater operation. This paper reviews the development history of submarine atmospheric environment control technologies and introduces their future development prospects. The developers of integrated atmospheric environment control technology should learn from foreign submarine and aerosphere equipment technologies, which aim to support long-term submerged operation and comfort demands, and better adapt to future submarine technology development and evolving mission, in order to constantly enhance the level of submarine cabin air quality of the Chinese navy. © 2022 Journal of Clinical Hepatology. All rights reserved.     

基于DLP投影的智能像素前照灯研究

本文介绍一种基于DLP投影的智能像素前照灯系统,其以LED作为光源,DMD芯片作为核心器件,基于数字光处理(DLP)技术,结合智能识别控制算法,实现全数字化操控,可扩展性好,控制精度高达百万像素级别。     

专家故障诊断系统在97型25Hz相敏轨道电路故障诊断中的应用

使用专家故障诊断系统对97型25Hz相敏轨道电路故障红光带问题进行监测;通过案例法详细描述实现过程,包括专家故障诊断系统的构成,提取专家经验形成知识库,以及使用推理机进行推理运算,得出相关结果等。     

跨坐式单轨与地铁和轻轨工程造价对比分析

城市轨道交通投资巨大,本着“量力而行,有序推进,因地制宜,经济适用”的原则,越来越多的城市选择了高架敷设的跨坐式单轨系统,故需要对其造价进行针对性研究以满足项目投资决策需求。结合国内工程实际应用,对地铁、轻轨及跨坐式单轨的工程造价进行剖析,对比其投资构成,总结出工程造价的主要影响因素。研究结果可为决策者选取合理方案、造价人员控制工程造价提供参考。     

Network operation reliability in a Manhattan-like urban system with adaptive traffic lights

Traffic breakdown to global gridlock occurring in congested traffic network makes the serious traffic congestion even much worse. This paper has proposed to use Network Operation Reliability (NOR) to quantitatively depict the probabilistic feature of traffic breakdown to global gridlock. The Nagel–Schreckenberg cellular automaton model has been used to simulate the traffic flow in a Manhattan-like urban network. A simple adaptive traffic light strategy has been proposed. It has been shown that if vehicles choose to use geometric shortest path, the adaptive traffic signals are able to remarkably enhance the NOR and sometimes the average velocity and the arrival rate as well. The vehicle distribution has been investigated, which has heuristically explained the enhancement of the NOR. A simple perimeter control strategy has been shown to fail to enhance the NOR. Finally, we show that if the time shortest path information could be provided and updated timely, then the NOR can be remarkably enhanced but the adaptive traffic signals have only trivial effect on NOR.     

广州大学城交通信号主动控制方法分析

基于主动控制思想,应用数理统计方法,分析广州大学城交通信号灯灯色转换时刻的变化情况,研究信号灯灯色转换时刻变化的规律,建立灯色转换时刻与时问之间的逻辑关系模型,并建立查询信号灯周期状态的预测模型。通过主动控制的手段,使得驾驶员掌握行驶路段中信号灯的状态,提高交通行车效率。     

压缩机进气消声器在轻型卡车上的应用

本文通过对消声器消声原理及压缩机进气噪声的频率特点的分析,论述了压缩机进气消声器的设计原理及设计过程。通过具体实例,对压缩机进气噪音特点进行研究,设计对应消声器对进气系统进行优化,对设计理论进行验证,在实车上获得了良好的效果。     

Twenty Years of Rail Crowding Valuation Studies: Evidence and Lessons from British Experience

Abstract

This paper reviews evidence from British experience of the valuation of rail crowding obtained over 20 years from 17 studies. It summarizes these studies, places some useful empirical evidence in the public domain and draws lessons from this considerable body of evidence and experience. Crowding valuations, both for standing and seated in crowding conditions, are summarized in terms of time multipliers, which are inherently more transferable than monetary equivalents. A meta‐analysis of 208 valuations is reported, finding the valuations to vary with load factor and journey purpose. The seating multiplier averages 1.19 and the standing multiplier averages 2.32. The latter is in line with widely used multipliers applied to walking and waiting time. The most recent evidence is based around the number of standing passengers per square metre, thereby providing a more accurate measure of the discomfort of standing since, unlike load factor, it allows for the layout of the carriage and ease with which crowding can be accommodated. As far as methodology is concerned, the paper covers issues such as presenting crowding in ‘stated preference’ exercises and the realism of the crowding levels offered, non‐linearities in the relationship between crowding multipliers and the severity and amount of crowding time, and probabilistic versus deterministic representations of crowding. The paper also identifies future areas for research.     

基于激光摄影测量方法的地铁限界检测系统研究*

限界检测系统主要采用激光摄影测量方法快速实现地铁限界非接触式检测,检测系统采用激光摄像式传感器实时采集隧道断面图像,通过对激光摄像式传感器非线性模型进行标定从而建立空间物体与摄像机图像像素之间映射关系,实现隧道断面上待测目标点的距离测量。针对系统中激光光条图像的处理,先后采用图像预处理算法提高图像处理效率,Sobel算子提取激光光条边缘,利用 Sobel算子提供的光条梯度信息经脊线跟踪法实现光条中心亚像素提取,提高检测系统精度。利用研制出的地铁限界检测系统进行现场试验和精度验证。试验表明,地铁限界检测系统能够满足地铁限界高精度检测需求,能够为地铁安全运行发挥重要作用。