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本文将"十二五"规划纲要的理念与我国内河水运业发展特点结合起来思考,从内河水运科学发展、构建现代内河水运体系、发展现代内河水运服务业等方面探讨内河水运未来发展战略。 相似文献
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<正>"十二五"开局之际,国务院正式颁布了《关于加快长江等内河水运发展的意见》,交通运输部与铁道部签署了《关于共同推进铁水联运发展合作协议》。国务院意见的出台对我国内河水运发展将产生哪些积极影响?加快铁水联运发展对于转变交通发展方式、完善综合运输体系具有什么重要意义?近日,本刊记者专访了交通运输部水运科学研究院张宝晨院长。 相似文献
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浙江省为打造低碳交通,提出以下设想:
发挥水运节能优势
着力实施内河水运复兴计划,加快高等级航道网、内河港口枢纽、江海联运体系建设,构建畅通、高效、平安、绿色的现代内河水运体系;围绕构筑“三位一体”港口服务体系的目标. 相似文献
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针对海中箱梁现浇施工中的工程量大、工期紧迫、悬臂法施工不能满足工期要求和施工难度大等问题,文章结合青岛海湾大桥箱梁现浇施工实践,介绍以钢管桩支撑作为承载基础,采用贝雷梁与碗扣式支架相结合的支架,成功地解决现浇箱梁施工难题的方法。 相似文献
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盾构机姿态参数的测量及计算方法研究 总被引:7,自引:0,他引:7
根据三点决定一个平面的原理,通过在盾构机中体上布置测量控制点,对其三维坐标进行测量;根据空间解析几何原理,推导出盾构机刀盘中心三维坐标以及俯仰角、横摆角、扭转角的计算方法.文章利用计算机的伪随机函数对盾构机姿态参数的测量精度进行了模拟评价,探讨了提高测量精度的方法.结果表明,盾构姿态参数的测量误差均服从正态分析;采用精度为3 mm的激光经纬仪测量控制点坐标,得到的盾构姿态参数的误差范围比规范要求小得多. 相似文献
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Maria Börjesson Mogens FosgerauStaffan Algers 《Transportation Research Part A: Policy and Practice》2012,46(2):378-391
Recent methodological advances in discrete choice analysis in combination with certain stated choice experiments have allowed researchers to check empirically the identification of the distribution of latent variables such as the value of travel time (VTT). Lack of identification is likely to be common and the consequences are severe. E.g., the Danish value of time study found the 15% right tail of the VTT distribution to be unidentified, making it impossible to estimate the mean VTT without resorting to strong assumptions with equally strong impact on the resulting estimate. This paper analyses data generated from a similar choice experiment undertaken in Sweden during 2007-2008 in which the range of trade-off values between time and money was significantly increased relative to the Danish experiment. The results show that this change allowed empirical identification of effectively the entire VTT distribution. In addition to informing the design of future choice experiments, the results are also of interest as a validity test of the stated choice methodology. Failure in identifying the right tail of the VTT would have made it difficult to maintain that respondents’ behaviour is consistent with utility maximisation in the sense intended by the experimenter. 相似文献