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81.
Ming-Hsiung Hsiao 《运输规划与技术》2015,38(8):889-908
This paper examines the relationships among different transportation modes, and between transportation and telecommunications, by applying the structural equation modeling (SEM) technique. For this purpose, we collected and compiled time series data on national travel demand, and socioeconomic and telecommunications conditions in Taiwan, and built national travel demand models using SEM. The estimation results show that the relationship between telecommunications and transportation demand (either car ownership or public transportation) is more complementary than substitutional. Moreover, car ownership is a type of inelastic necessity good, and its relationship with public transportation is more substitutional than complementary. Finally, among the three public transportation modes – rail, bus and domestic air – it is found that air is weakest in terms of competitive power. From the viewpoint of long-term forecasting trends, the bus holds its competitive power in comparison with other public transportation modes and would not be replaced in the future. 相似文献
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VARIABLECUTOFFFREQUENCYNONLINEARDIGITALFILTERS:I-ONE┐DIMENSION*GuHong(古红)ZhuYisheng(朱贻盛)(InstituteofBiomedicalEngineering,Sha... 相似文献
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�й����ܽ�ͨϵͳ��ITS����ϵ����о���չ 总被引:6,自引:1,他引:6
国家智能交通系统工程技术研究中心承担了国家“十五”科技攻关项目《智能交通系统体系框架及支持系统开发》,目前该项目的研究工作已经基本完成。本文通过对该项目研究成果的总结,系统介绍了中国ITS体系框架研究的最新进展。一是中国ITS体系框架(第二版)的修订情况,包括体系框架开发理论与方法的完善、中国ITS用户服务的更新、国家框架内容的全面修订等;二是支持体系框架编制全过程的软件系统(ITSA-CASS)的开发和应用情况;三是地方ITS体系框架的编制情况。 相似文献
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Cristen Don 《Coastal management》2013,41(4):421-426
The San Juan Islands National Wildlife Refuge (San Juan NWR) is comprised of 83 small islands, rocks, and reefs scattered throughout the San Juan Archipelago in the inland waters of Washington State. Current guidelines, set forth by the U.S. Fish and Wildlife Service (USFWS), advise vessels to stay 200 yards offshore from refuge sites to provide a marine buffer for birds and marine mammals who utilize the refuge (Murray, 1998). Compliance with the existing USFWS guidelines provides inherent protection to the intertidal and subtidal resources within these marine buffer zones and could arguably constitute a de facto network of marine protected areas (MPAs) in the region. This article explores how marine areas currently set aside from pbulic use and/or adjacent to upland protected areas, such as the San Juan NWR, could provide a politically feasible and cost-effective means for establishing MPAs. The idea is to build upon existing upland management by creating partnerships with other agencies and institutions in order to provide more organic management to marine areas and increase protection to the marine sources. 相似文献
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204国道改建工程在我省所经地区均为海淤地质,又是老路拓宽,施工难度较大,在实施过程中针对具体情况,结合科研,对沿线桥、涵、路基、路面、沟塘均进行了较好的软基处理,不仅保证了质量,而且节省了造价,缩短了工期.可供同类工程参考使用。 相似文献
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新建荆州至岳阳铁路在君山区约有46.52km位于东洞庭湖国家级自然保护区实验区范围内。从植被生产力及碳贮量和景观生态体系质量两方面介绍了东洞庭湖自然保护区自然体系的生态环境质量现状,并分析和预测了工程建成后保护区自然体系生物量、碳贮量及生产力的变化、自然体系的稳定状况。认为荆岳铁路的建设对东洞庭湖自然保护区自然体系生态完整性影响较小。 相似文献
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研究目的:深圳地铁3号线主要沿国道205中央分隔带高架敷设,同步建设的2种不同交通方式对两项目提出了一体化勘察设计的要求.本文结合地铁3号线对国道205改建工程的影响,对两项目的一体化勘察设计进行系统方案研究,探讨综合交通一体化勘察设计的新思路.研究结论:以地铁3号线为主要控制因素,以满足和实现国道205深圳段城市主干道交通功能为根本,充分考虑两项目设计原则与设计标准的不同,坚持一体化勘察设计原则,解决两项目之间存在的主要矛盾,达到"求同存异,协调一致".并对测量、勘察、路线、互通式立体交叉、给排水系统、消防及防灾系统、电力及照明系统、通信系统等进行了研究,提供了合理的解决方案,可作为一体化勘察设计的指导. 相似文献
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在介绍我国铁路车号自动识别系统成功投入使用后所取得效果的基础上,简要介绍铁路机车车辆自动识别系统在我国铁路的使用情况及相关规范、标准的制定和实施情况,对GB/T25340—2010《铁路机车车辆自动识别设备技术条件》中的重点章节予以解释和说明。 相似文献