唐代广运潭及其位置考述

唐朝天宝年间的广运潭是作为漕运码头而建,而关中漕运及渭河水运方面已有了足够深入而全面的研究,但因为广运潭未给后人留下足够的文献与实物,再加上考古方面的缺乏,导致了今人对广运潭仍存有许多疑问。为此,通过分析,对其开凿过程、原因、作用特别是其位置作一个较为全面的考述。     

Quantitative evaluation of air pollution in transport strategic environmental assessment: a case study based on uncertainty analysis and graphic information system technology

Although the impact of road transport on urban air quality has achieved a high profile in China, still greater attention is required as it has not yet been considered fully even in relation to the road network linking cities and urban areas. Strategic environmental assessment （SEA） is a systematic and comprehensive process for evaluating the environmental impacts of a policy, plan or program in publicly accountable decision-making. Air pollution has been recognized as a significant issue in most transport SEA practices. The Strategic Environmental Assessment of the Hubei Road Network Plan （2002-2020） （HRNP） was introduced as one of the World Bank＇s pilot SEA projects. An effective framework was developed to investigate the functional relationship between the road network and its potential air pollutant emissions. In this study, two indicators were identified： emission intensity/ inventory of pollutants and the spatial distribution of the most polluted areas. Because strategic actions are inherently nebulous and data quality is often disappointing, three alternative scenarios were employed to address uncertainties and data/scale issues. Calculations were made using emission models and results were analyzed with the help of statistical tools and the geographic information system （GIS）. The results from the project implementation and the feedback from the World Bank have both shown that the proposed framework is effective in the transport SEA process.     

浅析山西煤销集团物流体系建设

在山西煤炭运销集团快速发展的过程中,把物流纳入发展的轨道,架构具有中国特色的煤炭产业现代物流业,以采购、承运、销售为依托,在集团公司现有的物流资源基础上,组建包括采购物流、承运物流、销售物流三位一体的大型煤炭企业物流企业,依托企业物流优势、资源品牌优势,开拓社会物流服务业务具有重大现实意义。     

基于LOGIT的供应链运输方式选择问题

LOGIT模型是交通方式的选择中应用较广泛的一种方法,具有较好的应用效果。本文针对物流与供应链管理中常见的交通方式选择问题,考虑到LOGIT模型操作的简单性和经济性,运用LOGIT模型对其进行分析和仿真。结果表明:LOGIT能比较方便有效地反映现实问题。     

民国时期交通博物馆史事考

作为中国较早的科技类博物馆,民国时期交通博物馆的研究具有博物馆史和近代科技史的双重意义。交通博物馆筹建于1912年,隶属于交通部,1914年正式对外开放,1928年划归交通大学北平铁道管理学院。其建立与兴衰,折射出中国早期博物馆、早期工业发展的特点和命运。     

Study of transport behavior for Fe-doping La0.67Ca0.33MnO3 perovskite manganese

Systematic studies of the transport properties of La0.67Ca0.33Mn1-xFexO3 (x=0-0.3) systems showed that with increasing Fe-doping content x the resistance increases and the insulator-metal transition temperature moves to lower temperature. For small doping content, the transport property satisfies metal transport behavior below the transition temperature, and above the transition temperature it satisfies the small polaron model. This behavior can be explained by Fe3 doping, which easily forms Fe3 -O2--Mn4 channel, suppressing the double exchange Mn3 -O2--Mn4 channel and enhancing the spin scattering of Mn ions induced by antiferromagnetic clusters of Fe ions.     

智能交通系统的现状及发展

智能交通系统(ITS)是在传统的交通工程基础上发展起来的新型交通系统,该系统将信息、通信、控制和计算机技术及其他现代技术集成应用于交通运输领域,将交通四要素"人-车-路-环境"有机地结合在一起,将从根本上解决困扰现代交通的安全性、通畅性、节能和环保问题.论述了智能交通系统的组成及国内外智能交通系统发展状况,我国智能交通系统的的环境、任务现状、发展及建议.     

锰氧化物La1—xAxMnO3（A=Ca,Pb）输运性质中的晶界效应

本文研究了锰氧化物系列中Ｌａ０．７Ｃａ０．３ＭｎＯ３、Ｌａ０．６Ｐｂ０．４ＭｎＯ３多昌样品的输运性质,发现两样品的电阻率随温度的变化曲线在低温下（Ｔ〈０．８Ｔ）。皆存在明显的肩型凸起,与其相应单晶材料的性质有很大不同。作者认为这是晶界效应的贡献所致。文中首先从块层模型出发对昌部晶界效应和本征输运的共同存在及其作用规律进行讨论然后从晶粒内与晶界上两种双交换作用能量的差异探讨晶界效应的一种可能机理。     

基于SSH整合框架的运输企业安全管理系统设计与实现

首先对Struts,Hibernate,Spring框架进行了分析。根据SSH框架的分层模型,设计并实现了运输企业安全管理系统。该系统达到了设计目标,性能可靠,取得了令人满意的效果。