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经历了半个世纪的发展,集装箱运输已经成为当今交通运输现代化的重要形式。近年来,我国集装箱运输有了长足发展,相应的规范集装箱运输的多部法规也不断完善,但是仍然不能完全避免实践中产生纠纷。就集装箱运输中经常遇到的返还空集装箱的问题进行讨论。 相似文献
33.
Pull basedinformationservicesuchassearchengineandfull textretrievalserveusersinare trieval on demandmodewhenuserneedtofindwhathe/shewants .Howeverwiththeexplosivegrowthoftheinternettechniques,locatingrelevantinformationistimeconsumingandexpensive ,pushtechnologypromisesaproperwaytorelieveusersfromthedrudgeryofinformationsearching .Somecurrentcommercesoftwareor prototypesystemssuchasPointCastNetwork ,CNNNewswatch ,SmartPush,ConCallserveusersinapersonalizedway[1 3 ] ,whilerecommendationsyst… 相似文献
34.
公路客运小包裹运输模式具有独特性,它利用了现有的公路运输资源,既能满足顾客的需求,又能参与市场竞争,是公路客运不可多得的增值服务,为公路客运带来了活力。 相似文献
35.
A novel intelligent drug delivery system potential for the more effective therapy of the diabeticswas proposed, and the composition of system was analyzed. Based on the design of micro-electro-mechanicalsystems (MEMS), an iterative modeling process was introduced. Unified modeling language (UML) was em-ployed to describe the function requirement, and different diagrams were built up to explore the static model,the dynamic model and the employment model. The mapping analysis of different diagrams can simply verifythe consistency and completeness of the system model. 相似文献
36.
王鹏 《铁道标准设计通讯》2019,(11)
BIM技术应用是一次设计手段的变革,站场专业是铁路工程中的龙头专业,是BIM技术应用的重点专业,站场设计的效率和质量对整个铁路的建设和运营具有极其重要的影响。论述站场专业BIM技术应用现状。以站场专业利用BIM技术作为设计手段为目的,从设计软件、标准、基础数据和交付平台等方面对站场专业BIM技术应用提出解决对策;提出站场BIM设计软件研发的两种方法。以铁路工程信息模型分类和编码标准为基础对站场IFD标准进行扩充和完善,以站场和航测专业的数据接口为例对站场设计从二维到三维转变时的接口数据适应性调整进行说明。通过对站场设备添加可定位的身份编码,在自主研发的BIM综合管理平台上构建铁路站场专业三维信息模型组织结构树。 相似文献
37.
Due to frequent stop-and-go operation and long idling periods when driving in congested urban areas, the electrification of commercial delivery trucks has become an interesting topic nationwide. In this study, environmental impacts of various alternative delivery trucks including battery electric, diesel, diesel-electric hybrid, and compressed natural gas trucks are analyzed. A novel life cycle assessment method, an environmentally-extended multi-region input-output analysis, is utilized to calculate energy and carbon footprints throughout the supply chain of alternative delivery trucks. The uncertainties due to fuel consumption or other key parameter variations in real life, data ranges are taken into consideration using a Monte Carlo simulation. Furthermore, variations in regional electricity mix greenhouse gas emission are also considered to present a region-specific assessment for each vehicle type. According to the analysis results, although the battery electric delivery trucks have zero tailpipe emission, electric trucks are not expected to have lower environmental impacts compared to other alternatives. On average, the electric trucks have slightly more greenhouse emissions and energy consumption than those of other trucks. The regional analysis also indicates that the percentage of cleaner power sources in the electricity mix plays an important role in the life cycle greenhouse gas emission impacts of electric trucks. 相似文献
38.
P. K. Else 《运输规划与技术》2013,36(4):295-300
This paper extends the discussion of certain problems associated with road pricing raised in an earlier contribution to this journal. Firstly it is shown that where the value of time varies between different groups of traffic using the same congested road, optimal road pricing requires price discrimination between the groups such that those with the lowest value of time pay the highest charge and suffer the greatest losses. However, a uniform price based on an “equity” value of time would reduce the relative distributional effects. Secondly the paper takes up the suggestion that queueing (and by extension congestion) may be positively helpful in the allocation of resources and shows that this is not in general correct although there are situations in which the use of queueing alongside conventional pricing may have a role to play. Finally it is argued that governments’ apparent lack of enthusiasm for road pricing stems as much from political considerations as the more technical problems of applying it. 相似文献
39.
复合地层泥水盾构环流关键参数选择探析 总被引:1,自引:0,他引:1
为研究复合地层泥水盾构泥水环流参数选择的问题,结合狮子洋隧道盾构工程,采用泥浆临界沉淀流速计算方法计算软弱地层和软硬不均地层所需的泥浆送、排量,并运用费祥俊模型试验公式进行验算。由于复合地层地质条件的复杂性,泥水盾构环流参数的影响因素较多,结合以上计算结果分析不同地层特性对泥浆送、排量的影响。研究结果表明: 1)2种方法的泥浆送、排量计算结果相差不大,证明泥浆临界沉淀流速计算方法具有准确性和合理性; 2)在软硬不均地层进行泥水盾构施工时,应加大泥浆送、排量,以减少输送颗粒在排浆管内滑移、平动,同时减少舱内积碴和泥浆管的磨损。研究结果可为复合地层下的泥水盾构施工提供参考。 相似文献
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