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提速道岔控制电路在客专中的应用研究 总被引:1,自引:0,他引:1
随着我国列车运行速度的不断提高,提速道岔在客运专线中得到广泛的应用,与之配套的提速道岔控制电路在满足道岔启动电路的各项技术条件的同时,也对其可靠性、安全性提出更高的要求。对多牵引点转辙机的启动时序及其动作一致性等控制电路做了详细的分析说明,并提出了改进建议。 相似文献
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在介绍企业实施纠正措施和预防措施必要性的基础上,分析实施纠正措施和预防措施过程中存在的主要问题及其形成原因,指出提高纠正措施和预防措施有效性的具体做法。 相似文献
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AbstractTaking an institutional perspective, in this article we develop an index of the governmental support for public private partnership (PPP) — a ‘PPP Governmental Support Index’ (GSI) — which aims to measure the extent to which national governments provide an institutional framework that is either conducive or preventive for the introduction and diffusion of PPPs within transport infrastructure and other sectors. First, based on a substantive review of the literature, we define the elements of the PPP GSI, including the policy and political commitment regarding PPPs, the legal and regulatory framework, and the presence/absence of dedicated PPP-supporting arrangements. Second, we calculate the PPP GSI for 20 European countries, cluster them and compare similarities and differences in national governmental support of infrastructure PPPs. Third, we explore the potential link between national institutional index scores and infrastructure PPP activity in the 20 countries. Lastly, we discuss the potential and usefulness of the presented PPP GSI, as well as methodological limitations, and elaborate on how this index might be utilised to strengthen future comparative research on PPP in transport and other sectors. 相似文献
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According to the terms of the Ministerial Declaration on the Protection of the North Sea, input of the nutrients phosphorus (P) and nitrogen (N) to the coast from the Norwegian‐Swedish border to Lindesnes should be reduced by about 50% between 1985 and 1995. The State Pollution Control Authority (SFT) has analyzed how Norway can achieve this reduction in the most cost‐effective way and at the same time achieve the greatest possible improvement in water quality along the Norwegian coast and in its watercourses. Two alternative sets of measures were analyzed, both of which would meet the requirements of the Declaration. The lowest‐cost alternative would have average annual costs of about NKr 930 million (U.S.S150 million), and investments of about NKr 4000 million (U.S. $643 million). However, this set of measures would not take account of local water quality, and measures would therefore not always be introduced where the need is most pressing. SFT proposed that an alternative set of measures be implemented, almost all of which would also help to achieve local goals for water quality. This alternative will have annual costs of about NKr 980 million (U.S.$158 million), and investments of about NKr 4100 million (U.S.$659 million). 相似文献
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高校党务工作必须围绕教学这个中心来展开,就是要把为教学服务视为第一责任,把为教学作贡献视为第一选择,把为教学排忧解难视为第一要务。 相似文献
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北京首都国际机场旅客捷运系统是国内引进的第一条旅客运输快线,其通信系统组成与国内轨道交通基本相同,但也有一些独到之处。主要介绍车载移动视频的解决方案及其特点,以及视频报警联动功能的应用,对国内轨道交通移动视频监控系统的设计具有很好的借鉴作用。 相似文献
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文章以高职汽车专业机械基础课程为例,分析了专业基础课程的特点与课程改革现状,并以职业行动能力培养目标为基础,确定了"基于行动导向的三层次能力递进培养"的课程开发模式。该模式将重构后的课程分为六大基本模块和一个综合实践模块,并对应三层次的能力培养方案,设计了相应递进的三层次的教学项目,以实现知识能力的"生态构建"。该课程开发模式对专业基础课程的改革有较强的借鉴意义。 相似文献
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