深圳地铁蛇口线绿色照明设计

以深圳地铁蛇口线科苑站绿色照明设计为例,结合地铁的空间形式、建筑装修、美学需求等要素,首次应用LED光源、智能照明控制系统、DIALux软件等先进技术,创造出舒适、节能、安全和具有文化艺术特性的地铁照明环境;对地铁绿色照明设计的原则、思路和方法进行分析和探讨。     

浅谈贵州喀斯特溶岩区隧道溶洞处理施工技术

溶洞为岩溶洞穴,是地表水和地下水对溶性岩层经过化学作用和机械破坏作用而形成的地下溶蚀现象。岩溶对隧道的影响主要表现为结构物部分及全部悬空,大大降低隧道使用的可靠度;溶洞填充物外涌,给施工造成困难和安全隐患;季节性的岩溶洞穴涌水,给隧道施工和体系带来不安全和不稳定因素。因此,制定合理、科学、有效的溶洞处理方案对隧道顺利穿越岩溶发育地段极为重要。根据贵阳枢纽白龙线Ⅰ标胡家坡隧道DI2K24+932溶洞处理方案的具体实施情况,总结贵州喀斯特地貌区溶蚀发育地区溶洞的处理方法,以期对溶洞处理的设计与施工有一定借鉴意义。     

LED照明在轨道交通照明系统中的应用

LED照明作为一种新型的绿色照明,与传统照明相比,具有节能、高效,安全等特点,更符合低碳环保的理念。介绍LED照明的工作原理和特点,阐述北京城市轨道交通照明的现状及存在的问题,并通过收集LED照明在车站内的实验数据,分析LED照明在城市轨道交通的应用前景。     

Combustion characteristics of hydrotreated vegetable oil – diesel blend under EGR and supercharged conditions

This paper investigates the effects of Hydrotreated vegetable oil-diesel blend to combustion characteristics under various ambient oxygen concentrations and ambient pressure. Combustion characteristics were investigated using heat release rate analysis, two color method, soot concentration measurement and NOx concentration measurement. The experiments were carried out on a rapid compression expansion machine to simulate the ambient condition of a CI engine at TDC. Synthetic gas with oxygen concentrations of 21 %, 15 % and 10 % were used to simulate EGR conditions. A single hole injector was used with five different fuels: commercial diesel, HVO-commercial diesel blends and HVO. The results showed that increasing HVO blending percentages decreased ignition delay, flame temperature, soot concentration and NOx concentration. Heat release at oxygen concentration of 10 % dramatically dropped due to a shortened ignition delay, which resulted in less combustion. A decreased oxygen concentration from applied EGR conditions not only increased ignition delay, heat release, flame temperature and NO_x concentration, but also increased soot concentration. A combination of EGR and supercharged conditions by increasing ambient pressure and decreasing oxygen concentrations resulted in increased heat release, decreased flame temperature, ignition delay and soot concentration, compared to EGR conditions.     

大型电机端盖式滑动轴承的振动特性研究

本文针对大型电机端盖式滑动轴承,利用有限元法对其振动特性进行数值仿真分析。通过模态试验,对轴承的模态参数进行识别和提取,并验证了仿真模型和计算方法的合理性与有效性,进而掌握了大型电机轴承的振动特性及建模方法,为大型电机的低噪声设计奠定了基础。     

Feedback control strategy of a new car-following model based on reducing traffic accident rates

ABSTRACT

To reduce the traffic accident death rate effectively and alleviate the traffic congestion phenomenon, this study proposes a new type of car-following model under the influence of drivers’ time-varying delay response time. Based on Lyapunov function theory, this paper reduces the traffic accident rate problem to the stability issues of the new model. By constructing suitable Lyapunov functions and using the linear matrix inequality method, the stability problem of the new car-following model is studied. The model, under the action of the controller, can effectively restrain traffic congestion. Using the traffic accident rate model proposed by Solomon, compared with the car-following model without the controller, the model under the controller shows a stronger convergence. This also means that the traffic congestion phenomenon has been effectively suppressed while greatly reducing the mortality rate of traffic accidents.     

非接触式铁路货运车辆超偏载检测系统研究

针对现有铁路货运装载站存在的装货效率低,过程反复的问题,提出一种新型铁路货运车辆无线动态称重系统的设计方法,即在被测车辆底部非共线的4个点上垂直于轨面安装测距传感器,得到各测点投射到钢轨表面的位移量,从而得到车辆的超偏载信息。并设计出一种货运车辆超偏载检测装置。详细介绍车辆超偏载检测原理,系统的硬软件设计以及样机模型功能检验。研究结果表明:本系统稳定、测量精度较高、可拓展性强,可实时监测装载的超偏载状态,可达到预期效果。     

盐酸安非他酮缓释片与盐酸氟西汀治疗抑郁症的临床研究

目的评价安非他酮治疗抑郁症的疗效和安全性。方法采用随机、双盲双模拟、氟西汀平行对照、剂量固定的多中心研究。采用汉密尔顿抑郁量表(HAMD)17项总分减分值作为主要疗效指标,采用副反应量表(TESS)、实验室检查、心电图、生命体征和体格检查等观察药物的安全性。结果共收集意向性治疗(ITT)抑郁症患者228例,符合方案患者(PP)208例。根据PP样本,治疗6周后,安非他酮组和氟西汀组HAMD17总分减分值分别为(14.27±6.21)分及(14.86±6.09)分,与基线相比均具有显著性差异(P<0.01),但组间无显著性差异(P>0.05);安非他酮组在有效率、临床治愈率及CGI、HAMA评分上与氟西汀组比较均无显著性差异(P>0.05);ITT结果与PP相似。两组不良反应的症状和发生率也无统计学差异(P>0.05)。结论盐酸安非他酮缓释片治疗抑郁症的疗效、安全性以及治疗抑郁症伴焦虑的疗效均与盐酸氟西汀相似,是一种安全有效的抗抑郁药。     

领导重视公交硬件三年内车况达一流

近日,重庆市副市长余远牧视察恒通客车,就如何解决公交硬件较差问题召开了现场会议.会议讨论了重庆公交如何切实服务社会、发展自身的思路,明确了三年内在公交软硬件方面跻身全国三甲的目标,并对当前市民所关心的客车安全性和乘坐舒适性问题做了重要批示.     

Key Technologies for Decentralized Control Platform with Dynamic Evolution for Railway Transportation System

IntroductionResearches on autonomous decentralized system(ADS)[14]have been carried on for decades.Withthe typical features such as online property,ADShave found many applications in autonomous transpor-tation operation system(ATOS)[58].ATOS,has theabilit…