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在环保要求日益严格的条件下,节能减排成为很多行业的关注热点。本文阐述了尾气温差发电和压电发电的原理,并结合挖掘机工作与结构特点,提出了一种将尾气温差发电与压电发电结合的能量回收装置,并对装置中的悬臂梁单晶压电片和温差发电器结构做了简要介绍。 相似文献
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本文介绍了氢燃料电池的工作原理及工作特性,其作为船舶主电源(或主电源组成部分)的特殊要求及相应实现方法,通过对“三峡氢舟1”氢燃料电池发电装置的实例解析,为国内氢燃料动力船舶的全面推广提供了借鉴。 相似文献
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针对传统汽车尾气检测分析仪存在体型较大、操作繁琐、检测功能单一等问题,文章提出设计一款国六柴油发动机尾气排放检测装置。该装置硬件方面主要由氧传感器、滤纸烟度计检测、温度传感器,红外光源、水分离器、80C51单片机等组成,软件方面主要是通过单片机和电路的模拟软件进行调试。该装置的测量参数更加精确,安全系数更高,且造价成本低、使用寿命长,体积小、携带方便,值得进一步开发和推广。 相似文献
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在现代文明的今天,汽车已经成为人类不可或缺的交通运输工具,它给人们的生活和工作带来了极大的便利,也已经发展成为近现代物质文明的支柱之一。但是,我们也应该看到,在汽车产业高速发展、汽车产量和保有量不断增加的同时,汽车也带来了大气污染,即汽车尾气污染。本文介绍了我国汽车尾气污染的现状及发展趋势,汽车污染对社会造成的影响,并从政府管制和提高机动车及燃油质量和OBD监测等技术手段提出防治的对策措施。 相似文献
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对目前油料自动灌装系统中流量计发讯装置的原理、存在的问题作了分析,结合光纤传感技术在油料领域中的应用,对光纤流量发讯装置作了介绍。 相似文献
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本文首先介绍了太阳能光伏发电储能技术中存在的主要问题,研究了太阳能光伏发电储能控制技术的应用对策,主要从构建智能管控系统、改进优化储能技术、转变储能控制路径几方面展开详细论述,最后解析了优化太阳能光伏发电储能控制技术的主要路径,针对我国当前正在推行的分布式光伏发电项目进行了深入分析,以期能够为相关人员提供参考。 相似文献
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透平发电机组在实际运行过程中,一方面为乙烯装置提供不同压力等级的蒸汽动力,一方面又将热能转化为电能。因此,透平发电机组的自动控制对整个乙烯装置的平衡运行都非常重要。而透平发电机组要完成减温减压和发电两个任务,常规控制仪表是很难实现的,完成这两个任务主要是由DG505E电子自动高速速器来完成的。文中在简单介绍透平发电机组工艺原理基础上,着重讨论了透平发电机的自控制系统、联锁保护系统的设计方案。 相似文献
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Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD). An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip. It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links. 相似文献
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《Transportation Research Part A: General》1991,25(6):407-418
The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda. 相似文献
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介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。 相似文献
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明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。 相似文献
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天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area. 相似文献
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