排序方式: 共有127条查询结果,搜索用时 15 毫秒
71.
客流预测是城市轨道交通规划、设计及运营的依据.客流预测准确度的影响因素众多,加之城市建设快速发展,使得客流预测结果与实际客流数据存在较大差异.以上海市轨道交通为例,利用经验方法,通过校正线路初期高峰小时最大断面客流预测值,以及确定小交路折返点参考阈值的取值范围这两个有效手段,给出了修正客流预测的可行方法.在规划阶段减少客流预测的偏差,为后续实现灵活的运营组织提供条件,以达到满足实际客流、提高城市轨道交通服务水平的总体要求. 相似文献
72.
以某轻型商用货车为研究对象,根据生命周期理论构建以汽车生产过程中的原材料获取、生产运输、零部件制
造和车辆装配阶段为边界的碳排放量计算模型,探讨了轻量化措施中所涉及材料的生命周期碳排放差异,对比分析了该
车轻量化前后的碳排放量。结果表明,替代材料铝合金、镁合金、碳纤维增强塑料的生命周期碳 (CO2
) 排放量显著高
于被替代材料钢和铸造铁,分别为 6.23 kg/kg (锻造铝合金)、6.92 kg/kg (铸造铝合金)、14.76 kg/kg (车用镁合金)、
20.2 kg/kg (车用碳纤维增强塑料)、2.85 kg/kg (普通钢)、0.67 kg/kg (不锈钢) 和0.81 kg/kg (铸造铁);轻量化后的动
力总成系统、传动系统、底盘和车身部分的碳 (CO2
) 排放量分别增加了0.57%、525.51%、11.57%和33.29%,车辆生命
周期碳 (CO2
) 排放量增加了 36.22%;钢和铝生命周期碳 (CO2
) 排放量的降低对于轻量化前后车体部分的减碳效果均
较明显。 相似文献
73.
分析上海国际航运中心建设过程中在信息系统和集疏运体系建设等基础设施方面存在的问题,指出上海港在信息平台建设、航道治理、码头泊位及锚地靠泊能力等方面有待改进,认为需要采取相应措施进一步完善各种基础设施并提出相应建议。 相似文献
74.
75.
印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。 相似文献
76.
当今时代下的汽车造型设计中,溜背式设计成为主要的流行趋势之一,本研究基于对溜背式设计风格进行横向和纵向分析研究,探索其应用在汽车设计上时的设计特征、优势及与整车外观各部件之间的关系,为我国自主品牌汽车设计提供更科学的、合理的参考,迎合并满足消费者的需求与喜好,提升我国汽车自主品牌的销售量. 相似文献
77.
78.
Studying travel-related individual assessments and desires by combining hierarchically structured ordinal variables 总被引:1,自引:1,他引:0
Ordinal measures are frequently encountered in travel behavior research. This paper presents a new method for combining them
when a hierarchical structure of the data can be presumed. This method is applied to study the subjective assessment of the
amount of travel by different transportation modes among a group of French clerical workers, along with the desire to increase
or decrease the use of such modes. Some advantages of this approach over traditional data reduction technique such as factor
analysis when applied to ordinal data are then illustrated. In this study, combining evidence from several variables sheds
light on the observed moderately negative relationship between the personal assessment of the amount of travel and the desire
to increase or decrease it, thus integrating previous partial (univariate) results. We find a latent demand for travel, thus
contributing to clarify the behavioral mechanisms behind the induced traffic phenomenon. Categorizing the above relationship
by transportation mode shows a desire for a less environmental-friendly mix of modes (i.e., a greater desire to use heavy
motorized modes and a lower desire to use two-wheeled modes), whenever the respondents do not feel to travel extensively.
This result, combined with previous theoretical investigations concerning the determinants of the desire to alter trips consumption
levels, shows the importance of making people aware of how much they travel.
Marco Diana is a permanent researcher working at the Department of Hydraulics, Transport and Civil Infrastructures of Politecnico di Torino, Italy. His research interests include the study of innovative forms of public transport services and the analysis of multimodality behaviors. Tingting Song is a Scientific Programmer at The Rockefeller University, Center for Clinical and Translational Science, Biostatistics, Epidemiology, and Research Design Core, New York, NY, USA. She works on algorithms for non-parametric methods and their applications in medical research. She maintains the muStat package on CRAN.r-project.org and the Web server on muStat.rockefeller.edu. Knut M. Wittkowski is a Senior Research Associate at The Rockefeller University and Head of Biostatistics, Epidemiology, and Research Design at its Center for Clinical and Translational Science, New York, NY, USA. His research focuses on methods, meta data, and user interfaces to integrate nonparametric statistics into research and decision support systems. 相似文献
Knut M. WittkowskiEmail: |
Marco Diana is a permanent researcher working at the Department of Hydraulics, Transport and Civil Infrastructures of Politecnico di Torino, Italy. His research interests include the study of innovative forms of public transport services and the analysis of multimodality behaviors. Tingting Song is a Scientific Programmer at The Rockefeller University, Center for Clinical and Translational Science, Biostatistics, Epidemiology, and Research Design Core, New York, NY, USA. She works on algorithms for non-parametric methods and their applications in medical research. She maintains the muStat package on CRAN.r-project.org and the Web server on muStat.rockefeller.edu. Knut M. Wittkowski is a Senior Research Associate at The Rockefeller University and Head of Biostatistics, Epidemiology, and Research Design at its Center for Clinical and Translational Science, New York, NY, USA. His research focuses on methods, meta data, and user interfaces to integrate nonparametric statistics into research and decision support systems. 相似文献
79.
移动支付、语音购票、刷脸过闸等技术是城市轨道交通AFC(自动售检票系统)未来发展的方向。本文针对城市轨道交通领域移动支付技术的发展和应用,结合徐州地铁iAFC(互联网售检票系统)建设方案,对iAFC系统架构、业务场景、接口设计等方面进行阐述,对类似新建或改造AFC项目提供借鉴。 相似文献
80.
在"交通强国"战略思想的指导下,综合交通系统体系构建与编制工程已全面开展.目前对于交通强国背景下小城镇交通规划研究多为单一角度,不够全面和系统.分析新形势下综合交通的发展重点,从"人性化""综合化""生态化""规划协调"四方面探究小城镇交通规划的必要性,并在此基础上分析当前小城镇交通发展过程中存在的主要问题,以居民、道路、交通空间为核心需求对小城镇交通规划产生的新要求进行分析.探索新背景下小城镇交通规划的总体思路,为进一步引领我国小城镇的交通发展提供基础理论. 相似文献