共查询到20条相似文献,搜索用时 46 毫秒
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城市配送也称城市货运、城市物流,是社会物流体系的重要组成部分,直接关系城市居民生产生活。为更好地发展成都市货运产业,本文对成都市绿色配送发展进行需求分析。首先论文根据成都市区位和发展现状总结需求特征,总体呈现个性化、多样化、“互联网+”货运配送模式、绿色低碳循环等多种特点。其次结合成都市经济社会发展现状,选择GDP、第一产业总产值、第二产业总产值、第三产业总产值、外贸进出口总额、社会消费品零售总额、固定资产投资总额、城镇居民人均可支配收入和货运周转量这9个主要经济指标,作为预测成都市综合货运量的参考指标,分别采用二次项、三次项、四次项和对数方程四种预测方法预测2023-2025年的成都市地区生产总值社会消费品零售总额;结合成都商务部门等提供的基础数据,论文采用一元线性回归法、指数平滑预测模型、弹性系数法和移动平均自回归模型对成都市配送货量和货物种类进行预测分析,得到结论为成都市2023年到2025年配送货量呈逐渐增长趋势,将由2023年的3.89亿吨增长到2025年的4.07亿吨。最后论文结合成都市区现有配送车辆利用调查和预测模型,对未来三年配送车辆数据进行预测,到2025年,成都需投... 相似文献
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本文以玉树州市结古镇物流配送中心车辆配送方案为研究对象,分析了结古镇当前物流配送现状,利用TransCAD软件分析当前物流配送网络,采用边界分配法对配送区域进行合理划分,使区域内网点相对集中;在划分后的配送区域内,使用启发式算法对车辆调度数量进行优化计算,合理配置配送车辆及配送路线,减少配送车辆总行驶里程,降低物流配送成本,提高车辆运载效率和配送系统效率,提高了物流公司竞争力。 相似文献
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随着电子商务兴起和满足物流管理中降低库存、提高顾客服务水平的需要,城市货运组织出现多品种、少批量、多批次的JIT配送和直接配送、家庭配送等发展趋势。货运需求变化导致城市道路货运车辆大大增加,加剧了城市交通拥挤和环境污染。交通拥挤使货运车辆速度下降,导致城市配送成本上升、配送准确性和顾客服务水平下降,使企业降低物流成本的目标难以实现。我国许多城市已经完成现代物流(业)发展规划,对区域物流发展提出宏观战略构想和保障措施,物流业规划宏观性决定其对城市货运问题没有进行深入研究。而目前我国城市交通规划中很少进行货… 相似文献
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开展水土流失监测是水土保持监管的重要手段。文章以广西沿海高速公路改扩建工程一期工程水土保持监测实践为例,分析了工程建设水土流失特点,介绍了水土保持监测技术和方法,并通过对工程实例监测结果的分析评价,提出了水土保持监测工作中易出现的问题及相应的解决方案。 相似文献
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Caspar G. Chorus 《Transportation Research Part A: Policy and Practice》2012,46(7):1003-1012
This paper studies to what extent the Logsum-measure of user benefits relates to travelers’ perceptions of choice set-desirability and choice-satisfaction. Knowing these relations is important since researchers have recently started to analyze and interpret user benefits in general – and Logsums in specific – in terms of these more behaviorally oriented notions, rather than in terms of expected utility. Participants to a stated route choice experiment were asked to indicate, after each choice made, to what extent they considered the choice set to be desirable, or to what extent they were satisfied with the chosen alternative. These measurements were correlated with Logsums that were computed for each choice situation. In addition, the paper derives a regret-based Logsum (which gives the expected regret of a choice situation) and presents a comparison with its utilitarian counterpart. Also for this regret-based Logsum, correlations with desirability- and satisfaction-ratings are computed. As a general finding, it appears that all computed correlations are rather weak. This suggests that, at least in the context of our data, the utility-based Logsum and its regret-based counterpart appear to have only a fairly weak connection with the behavioral notions of choice set-desirability and choice-satisfaction. 相似文献
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隧道及地下工程结构防排水技术的发展和应用 总被引:4,自引:0,他引:4
文章总结了大瑶山隧道修建以来其复合式衬砌结构防排水试验研究和应用情况,介绍了塑料防水隔离层的防水机理及各种防水型式的优缺点,提出了改进建议. 相似文献
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通过研究汽车与船舶的油耗特点,结合燃油种类与CO_2排放量的关系,建立了计算公路运输与水路运输单位耗油量与单位CO_2排放量的数学模型。通过敏感性分析,研究车速或航速与载货率对车辆或船舶单位CO_2排放量的影响。以从厦门港到盐田港的干散货运输为例,做了节能减排计算分析,并将结果与用其他方法获得的结果对比。在此基础上,对公路运输与水路运输节能减排做了敏感性分析研究,可以计算出能够体现水路运输节能减排优势的临界货运量。结果表明本文中介绍的方法能够为核算、比较公路运输与水路运输的节能减排效果提供更科学的量化参考。 相似文献
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Recent years have shown a rising popularity of the concept of resilience—both theoretically and empirically—in complex systems analysis. There is also a rising literature on resilience in the transport and spatial-economic field. The pluriform interpretation of resilience (e.g., engineering vs. ecological resilience) is related to methodological differences (e.g., stability in dynamics vs. evolutionary adaptivity). But in all cases the fundamental question is whether a complex system that is subjected to an external shock is able to recover, and if so, to which extent. The present paper [Based on presentation from cluster 6 (Accessibility) of the Nectar 2015 conference in Ann Arbour, USA.] aims to add a new dimension to resilience analysis in spatial systems, by addressing in particular the relationship between spatial accessibility at a municipality level and the resilience outcomes of the spatial system concerned. It does so by investigating to which extent accessibility of Swedish and Dutch municipalities has mitigated the local shock absorption from the recent economic recession. In our study the shock absorption capacity of municipal accessibility is estimated by analysing the relevant resilience indicators for the period concerned. In this context, conventional resilience indicators based on either multivariate complex data (in particular, the Foster Resilience Capacity Index) or employment data (in particular, the Martin Resilience-Employment Index) are confronted with spatial connectivity data based on local accessibility measures, so that geographical mobility may be regarded as one of the shock-mitigating factors. The empirical analysis is carried out for two countries which have both proven to be rather shock-resistant during the recent economic crisis, viz. Sweden and The Netherlands. Clearly, the geographical structure of these countries forms a sharp mutual contrast, viz. a spatially dispersed economy with a few distinct urban concentrations versus a spatially dense economy with one major metropolitan centre (the Randstad), respectively. Our experiments are carried out for the 290 municipalities in Sweden and 40 COROPs in The Netherlands. Our research findings show relevant and new insights into differences in the local recovery potential in Sweden and The Netherlands. 相似文献