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输油设备的完好率和利用率对原油成品油管道输送的经济性有直接影响,作者针对目前输油设备存在的重用轻养、重修轻改、维修技术力量薄弱等问题,提出了成立输油设备维修中心、维修技术和信息培训中心等解决的对策的措施,以提高管道输送设备的整体技术水平。 相似文献
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为适应高质量发展和节能减排的要求,企业越来越注重仓库管理精细化和精准化,进一步提出了对仓库中的叉车作业设备及人员的精细化管理需求,从而为货物在库流转提供更优化的路线方案规划。目前市场上常用的方法是在仓库内安装UWB定位读取设备,通过读取UWB定位标签来解决室内设备和人员的定位。但这种技术方案不仅成本高,而且施工复杂。通过大量的调查研究和试验,本文研究提出应用RFID技术的仓库设备定位解决方案。采取软件和硬件相结合,在满足仓库叉车设备定位需求的同时,整体建设方案的费用仅是市场UWB设备定位方案十分之一,有效实现了降本增效碳减排效果,同时,该方案具有施工简单,有非常强的应用推广价值。 相似文献
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为促进核电仪表管阀件的设计,促进设备的国产化,对仪表管阀件在核电站中的设计与应用以及核电站用仪表管件设计的特殊性进行了分析,并结合工程设计经验、现场反馈情况及对照不同堆型项目的类比情况,介绍了目前核电机组仪表管件设计中的重点和难点问题并提出了改进方案。对核级管件国产化的现状进行了分析和展望。 相似文献
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介绍了格-拉(格尔木-拉萨)成品油管道6号泵站技术改造试点工程概况,输油工艺设计,主要设备与阀件选型及站控系统。分析了改造取得的成功之处,同时分析了存在的问题,并提出了改造的建议。 相似文献
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《管道技术与设备》2021,(4)
管道出现泄漏时,截断阀能识别泄漏压降信号并进行截断。干线中存在往复式压缩机时,压缩机抽吸会在管道内产生压降,该压降信号与干线泄漏压降信号存在重复,有可能会引起截断阀的错误截断。以重庆相国寺储气库为例,分析往复式压缩机抽吸工况与管道泄漏工况压降速率的异同,为截断阀的准确截断提供参考依据。利用Pipeline Studio软件建立压缩机抽吸工况、管道泄漏工况仿真模型,得到了压缩机抽吸条件下输量、压缩比、阀室距压缩机的距离对阀室压降及持续时间的影响。对比了泄漏工况与压缩机抽吸工况的异同,说明了在存在往复式压缩机的干线中,对截断阀设置一定延迟时间的重要性。 相似文献
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This paper reviews recent research into the demand inducing effects of new transportation capacity. We begin with a discussion of the basic theoretical background and then review recent research both in the UK and the US. Results of this research show strong evidence that new transportation capacity induces increased travel, both due to short run effects and long run changes in land use development patterns. While this topic has long been debated amongst transportation planners, the fundamental hypothesis and theory has long been apparent in studies of transportation economics and planning that evaluated different issues (e.g. travel time budgets and urban economic development effects). We summarize much of this work and relate the theoretical issues to recent empirical research. We then proceed to examine recent changes in transportation and environmental policy in the US and the UK. The role of the new knowledge of induced travel effects would be expected to lead to changes in the conduct of transportation and environmental policy. Changes in policy and implementation of those policies are still occurring and we provide some suggestions on how to move forward in these areas. 相似文献
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Robert E. Paaswell 《Transportation》1973,2(4):351-371
An examination of current population statistics shows that in the U.S. more than half of the population is without immediate access to a car, and in the U.K. more than three-fifths of the population is without access to a car. This phenomenon has been accentuated by national investment in both countries in major highway programs. The term carless refers to more than just households that own no cars. It extends, in households with cars to those without licenses (old and young), the handicapped, and even the licensed drivers who have no access to the family car when it is in use elsewhere (e.g. at work). The most severely effected are those in urban areas and especially the urban poor. Transportation expenses are limited for the poor when other family expenditures (food, shelter) take a high priority. Once the work trip has been satisfied, money for other trips, for the poor, is not always available. One solution to cost-free travel is pedestrianism (walking), but this too is difficult in urban areas where the pedestrian has been overlooked in favor of the car. Solutions to problems of the carless include dial-a-ride, better public transit, and better design of urban form. 相似文献
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隧道围岩体内位移监测分析 总被引:2,自引:0,他引:2
隧道围岩体内位移监测结论对于判断围岩稳定性和保证施工安全与工程质量起着重要的作用。文章以一高速公路隧道为依托,介绍了围岩体内位移测量设备和工作原理,并通过对其围岩体内位移检测数据的分析,提出了隧道围岩体内位移监测的注意事项。 相似文献
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文章基于钦州市城乡客运的现状,阐述了钦州市城乡客运存在的安全保障问题及其原因,提出了加强城乡客运运输安全保障的主要对策。 相似文献
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文章简单的介绍了泰山中天门索道应用无功功率补偿和滤波技术,提高功率因素,降低电耗,改善供电质量的具体做法和体会,可供有关索道企业参考。 相似文献
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城乡公交车站点长时间停车等客,站外随意停车等违规现象十分普遍,文章针对这一情况,通过交通事故案例分析,找出城乡公交车违规停车现象存在的原因,指出了违规停车的危害性并提出解决方法. 相似文献
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Ronald F. Kirby 《Transportation》1981,10(1):61-86
This paper reviews a number of recent innovations in the regulation and operation of taxicabs in U. S. cities. The paper discusses the growing involvement of various levels of government in public transportation programs which affect the taxicab industry, and identifies the opportunities and problems created for the industry by this increased government activity. Innovations in the types of public transportation services which can be provided by taxicabs are discussed first, followed by a review of the administrative procedures which can be employed to involve taxicab companies in publicly funded programs. Proposals for changes in the regulations governing taxicab services and prices are discussed next, with particular attention to significant regulatory changes which have been implemented in U.S. cities in recent years. Finally, innovations in the technology of taxicab operations are reviewed, including improvements to vehicles, computerized dispatching techniques, and procedures and equipment for computing fares for taxicab services. 相似文献
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Asha Weinstein Agrawal Paul Schimek 《Transportation Research Part D: Transport and Environment》2007,12(8):548-563
This paper examines data about walking trips in the US Department of Transportation’s 2001 National Household Travel Survey. The paper describes and critiques the methods used in the survey to collect data on walking. Using these data, we summarize the extent of walking, the duration and distance of walk trips, and variations in walking behavior according to geographic and socio-demographic factors. The results show that most Americans do not walk at all, but those who do average close to thirty minutes of walking a day. Walk trips averaged about a half-mile, but the median trip distance was a quarter of a mile. A significant percentage of the time Americans’ walk was spent traveling to and from transit trips. Binary logit models are used for examining utility and recreational walk trips and show a positive relationship between walking and population density for both. For recreational trips, this effect shows up at the extreme low and high ends of density. For utility trips, the odds of reporting a walk trip increase with each density category, but the effect is most pronounced at the highest density categories. At the highest densities, a large portion of the effect of density occurs via the intermediary of car ownership. Educational attainment has a strong effect on propensity to take walk trips, for both for utility and recreation. Higher income was associated with fewer utility walk trips but more recreational trips. Asians, Latinos, and blacks were less likely to take utility walk trips than whites, after controlling for income, education, density, and car ownership. The ethnic differences in walking are even larger for recreational trips. 相似文献