区域轨道交通与城市轨道交通衔接模式

简要阐述区域轨道交通和城市轨道交通的基本概念,在分析区域轨道交通和城市轨道交通技术特征的基础上,提出都市圈的区域城市铁路发展模式,以及区域轨道交通与城市轨道交通的衔接模式.以重庆1h经济圈的轨道交通布局为例,探讨1 h经济圈城市铁路与城市轨道交通的衔接方案.     

京津冀区域轨道交通信号系统设计关键点及新技术应用研究

为理清京津翼一体化前期规划和研究阶段信号系统建设思路,重点研究设计关键点及新技术。通过分析京津冀区域轨道信号系统应用现状,对区域不同轨道交通模式信号应用技术比较,从互联互通需求、运营功能需求和技术融合需求三方面出发,提出系统制式选择注重兼容性、运营需求引导技术创新和注重技术融合及国产化应用等设计应重点关注问题,并对列车自动运行、车地通信和北斗卫星导航等应用新技术进行分析展望。     

市域铁路两种牵引供电制式工程投资对比分析

随着城市化和城镇化进程的加快及区域经济发展实力的增强,市域铁路建设进入轨道交通行列。在市域铁路工程建设中,牵引供电系统是采用25 kV交流供电制,还是采用750 V或1 500 V直流供电制,其选择直接影响到工程项目的建设规模、技术和建设标准、网络资源共享和工程投资。此文在分析交、直流供电制式主要技术特点的基础上,就选择交、直流供电制式的关键因素进行论述,并以工程实例对2种供电制式的工程投资进行分析与对比。从工程投资来说,市域铁路采用高架敷设方式,交流供电制式节省投资;采用地下敷设方式,直流供电制式节省投资。     

利用既有张博铁路开行市域列车方案研究

针对利用既有张博线开行市域列车,从客流角度分析线路走向与市域客流走向的契合度,研究本项目对轨道交通的替代性和建设的必要性。结合既有铁路现状及线路运输功能,推荐增建二线改造成双线电气化铁路方案;考虑本线需要在维持货运运输的基础上开行市域列车,对本线速度目标值、车辆类型、车站布置、列控系统、自动售检票系统等问题进行研究比较,推荐本线速度目标值100 km/h,开行CRH6型动车组,4辆编组,到发线有效长280m,采用CTCS系统和非接触式IC卡式自动售检票系统。同时对运输组织模式和运营管理方式进行深入探讨。     

Ground travel mode choices of air arrivals at regional destinations: The significance of tourism attributes and destination contexts

The aim of this paper is to examine the air leisure arrivals’ ground travel mode choice in the context of their decision to disperse beyond the gateway. A stated choice experiment was designed to examine the dispersal and travel mode choice of leisure visitors arriving on air transport at Cairns. Results show that for a hypothetical public bus alternative, attributes such as ‘sightseeing opportunities’ and ‘driver quality’ were significant for trips made to less known destinations located south of Cairns, compared to destinations north of Cairns. Findings suggest that while travel mode attributes and trip characteristics are significant determinants of the mode choice of air leisure arrivals, the extent of their significance varied markedly across destinations. Although the data examined in this paper were collected in Cairns, this research should be of relevance to many regions interested in understanding the relationship between destination transport and dispersal of air arrivals.     

The spatial productivity of transportation infrastructure

Transportation infrastructure services may cause an impact on the economy of the region in which they are located and, additionally, they are likely to have an impact on other regions. This effect has been labeled the spillover effect. In this study, the existence of direct and spillover effects of road, railway, airport and seaport infrastructure projects is tested by estimating a production function. Together with this primary objective, two common concerns in the literature are addressed: the lack of theoretical foundations for spatial econometrics models and the likely endogenous relationship between transport infrastructure and economic development. The estimated production function takes the form of a Spatial Durbin Model and is estimated using panel data from the 47 peninsular Spanish provinces by alternatively applying a Maximum Likelihood estimator and Instrumental Variables/Generalized Method of Moments estimators. According to the estimates, road transport infrastructure positively affects the output of the region in which the infrastructure is located and its neighboring provinces, while the remaining modes of transportation projects cause no significant impacts on average.     

高铁网络对郑州经济发展影响分析

在高铁逐步成网的背景下,郑州作为传统意义上的交通枢纽迎来了前所未有的发展机遇。在国家战略及省市政府的规划部署下,郑州开始布局"米"字型铁路网络,积极参与"一带一路"建设,不仅为国家发展提供重要支撑,而且拉动了本市经济发展。本文采用SWOT分析方法,从优势、劣势、机遇和挑战等方面研究了高铁网发展对郑州经济发展的影响,提出以"米"字型高铁网络推动郑州经济发展的建议。     

Exploring the hidden potential of sugar beet industry brownfields (case study of the Czech Republic)

The paper focuses on spatial analyses of sugar beet industry brownfields in the Czech Republic. In the first part of the paper history of sugar beet industry on the area of the Czech Republic is briefly presented, then links between location of these sites and its transport potential are discussed. Benefits of brownfields regeneration for regional development are also evaluated. In the empirical part of the paper 49 brownfield sites within the Czech Republic, where the sugar beet industry was abandoned during the transition period after 1989, are evaluated and classified based on field research and aerial picture analyses. Three examples of reuse of former sugar beet factories are finally presented. It was found that development potential of studied sites is highly depended on their geographical location and some inspiration might be derived from presented examples. More targeted supportive policy in the Czech Republic to support regeneration of brownfields is needed. In the concluding part of the paper further development possibilities of sugar beet industry brownfields and their railway connection are considered.     

Siliceous plankton dominate primary and new productivity during the onset of El Niño conditions in the Santa Barbara Basin, California

The potential for carbon export and the role of siliceous plankton in the cycling of C and N was assessed in natural plankton assemblages in the Santa Barbara Basin, California, by examining uptake rates of inorganic carbon, nitrate and silicic acid. In April–August 1997, the concentrations of chlorophyll a, particulate organic carbon, particulate organic nitrogen and biogenic silica were measured twice monthly, and results revealed the occurrence of at least three blooms, the largest in June. Particulate elemental ratios of C, N and Si were similar to ratios of nutrient-replete diatoms, suggesting that they dominated this bloom. Mean integrated rates of carbon, nitrate and silicon uptake during the 4-month study period are similar to other productive coastal and upwelling regions (103, 8.3 and 13 mmol m⁻² day⁻¹, respectively). New production rates were twice as high as previously reported in this region and indicate that high rates of new production along eastern boundary currents are not confined to the major coastal upwelling regions. C/NO₃⁻, Si/NO₃⁻ and Si/C uptake ratios varied widely, and mean integrated ratios were 14±5.4, 1.6±1.0 and 0.12±0.07 (S.D.), respectively. That mean C/NO₃⁻ uptake ratio corresponds to an f-ratio of about 0.5 indicating a large potential for particulate export. Based on the average Si/NO₃⁻ and Si/C uptake ratios, diatoms could perform all of the primary production and nitrate uptake that occurred during the study; these rates also suggest that export is controlled by diatoms in this system. The mean Si/C biomass ratio was lower than the mean Si/C uptake ratio, consistent with the preferential export of Si relative to C observed in sediment traps in the basin. The study took place during a period of surface-water warming, with nitrate and silicic acid concentrations decreasing throughout the onset of the 1997–1998 El Niño conditions. Although diatoms contributed less to particulate biomass during the low nutrient conditions, high f-ratios (0.33–0.66) were maintained.     

京沪高速铁路多渠道售票的设计方案探讨

发展多种售票方式,为用户提供更便捷的客票服务成为高速铁路亟待解决的问题。通过京沪高速铁路区域中心客服系统设计,对多渠道售票方式及其实现进行相关研究和探讨。