我国客运专线GSM-R网络建设方案的建议

欧洲铁路联盟确定GSM-R为欧洲铁路无线通信的标准制式,该制式为列车控制系统提供了信息传输平台,使欧洲跨国列车可以畅通运行。我国铁路技术政策也规定GSM-R作为我国铁路综合数字移动通信系统,并在青藏线、大秦线和胶济线进行GSM-R典型工程试点,为我国铁路客运专线GSM-R网络建设积累经验。建议GSM-R核心网建设应采取总体规划、分步实施的原则,采用智能网解决GSM-R网络的互联互通,客运专线按照预留双网条件建设,初期按无线列车控制系统的覆盖要求建设单层网络,重点解决场强覆盖问题。     

驼峰可控顶自动调速系统控制技术研究与应用

根据可控减速顶的调速原理，介绍驼峰可控顶自动调速控制系统的控制技术。通过设计相关的软件和硬件，对溜放车组进行精细位置跟踪，实现变速控制。应用效果表明，此系统具有控制精确、可靠性和安全性高等特点，满足运输生产要求，适用于我国中小驼峰现代化改造。     

Small scale retentive structures and Dinophysis

Despite its rarity, Dinophysis acuminata is in terms of economic impact, the first toxic algal species along the coasts of Western Europe. It is observed at low levels (< 20 cell l^− 1) all the year round but toxic events occur mainly in late spring and summer. D. acuminata ecophysiology is largely unknown due to the inability to culture it. Therefore, standard biomass models based on inorganic nutrition are largely inadequate. Presently, any progress in describing the conditions of population growth of this species will be a step forward to prediction of harmful events at the coast. This species has been observed at increased, albeit low cell densities in retentive eddies located in pycnocline layers. A concentration build-up of one species results from the balance between growth and loss processes, one of the latter being dispersal. The scales of interest for a D. acuminata population are of the order of 10 nautical miles on the horizontal and duration of 10 days, for a reported achievable growth rate of 0.6 day^− 1. A three dimensional (3D) hydrodynamical model of the Bay of Biscay has been elaborated to reproduce hydrological structures over the last decade. We attempt here to relate the existence of retentive structures revealed from simulations under realistic forcing conditions and the toxic coastal events recorded in the 10-year time series of the French plankton monitoring network database. The eddies in the coastal area appear to be directly related with the Dinophysis coastal events and they may be a potential effective tool to predict those.     

可靠性理论在城市轨道交通供电系统中压环网分区设计中的应用

定性分析已难以满足城市轨道交通中压环网分区方案精细化设计要求,必须以定量分析作为评价或研究的基础。根据可靠性理论,采用马尔可夫状态空间法、最小路集法建立了城市轨道交通中压环网分区模型,结合具体工程对中压环网分区方案与车站变电所可靠性进行了定量分析。建议在前期设计时,应采用可靠性理论对年平均停运时间进行评估,以确定兼顾经济性和可靠性的中压环网分区方案。     

湖北省汉十高速公路管理处应急预警指挥系统解决方案

该文根据目前汉十高速公路应急预警管理系统的现状,对目前高速公路公司突发事件应急预警管理主要存在问题进行分析,提出按照应急预警管理内容将整个应急预警管理过程分为平时管理、战时管理、基础数据库建设三部分;从技术角度分析其可行性,介绍该系统整体模型设计原理,系统框架及其业务功能划分;并针对不同应急内容进行详细说明。     

GPS技术在道路观测中的应用

介绍了道路断面测量的基本要求,比较了GPS技术和全站仪测量方法的利弊,详细介绍了GPS测量的转换参数解算和动态GPS测量的误差。介绍了一个GPS测量的实例。是后提出了应用GPS技术应注意的事项。     

基于新旧动能转换背景车辆工程专业新能源汽车方向课程体系实施的保障措施——以青岛黄海学院为例

文章以青岛黄海学院为例,在对新能源人才现状及需求调研的基础上,设计面向“新旧动能转换”背景下的车辆工程专业新能源汽车课程体系,提出车辆工程专业新能源汽车方向课程体系的实施保障措施,以期培养出适应新能源汽车行业和企业发展需求的新能源汽车人才。     

Behavioral responses to pre-planned road capacity reduction based on smartphone GPS trajectory data: A functional data analysis approach

Abstract

Pre-planned events such as constructions or special events lead to road capacity reductions and create bottlenecks in the traffic network. The traffic impact of such events goes beyond local areas, as informed drivers may detour to alternative corridors and consequently the traffic congestion may divert or propagate to other corridors. Due to the lack of real observation data, traditional traffic impact analyses are typically based on simulation models, fixed-location sensor data or survey questionnaires. In this research, we use high-resolution vehicle trajectory data collected via a smartphone app, which is capable of keeping track of individual driver’s behavior before and after road capacity reduction, to investigate travelers’ behavioral responses to pre-planned events and the contribution factors. For this purpose, a functional data analysis (FDA) approach-based clustering method is firstly proposed to cluster trajectory data and identify detour patterns, and two logistic and a least absolute shrinkage and selection operator (LASSO) regression models are used to explain drivers’ detour behavior choice for each pattern with spatial and temporal features of interest. A case study based on a lane closure event on MoPac expressway in Austin, TX is used as an example in this research. The case study demonstrates that: (1) the freeway capacity reduction triggered heterologous behavior responses, (2) driver detour behavior exhibits three major patterns and (3) each detour pattern highly depends on spatial features such as trip length, distance to freeway entrance and distance to other alternative freeways, in addition to the temporal features when the trip happens.     

新建宁启铁路客货共线铁路信号特殊设计及运用

宁启铁路复线电气化改造工程(以下简称宁启项目)是利用既有线改造复线电化。工程实施中,正值中国铁路建设从既有线提速全面转向高速铁路,各种技术规范不断更新,使该项目实施过程不断涌现出新情况、新问题。就宁启铁路复线电气化改造工程信号设计问题及解决方式进行整理和分析。     

时延法纯侧音测距体制针对星上应答机侧音反相的解决方法

针对中法测控合作中法方星上应答机出现的侧音反相问题,以某采用时延法纯侧音测距体制的测控系统为例,提出两种解决方法,并在自校、对塔标校和中法联网试验中进行验证.