市政给排水管道工程施工质量管理

从施工准备阶段、管道施工阶段、管线安装、检查井施工以及土方回填和闭水试验等方面论述了市政给排水管道工程施工质量管理重点及措施。     

X射线管道爬行器检测质量控制

论述了油气输送管线对接环焊缝射线检测质量控制的重要性，提出了X射线管道爬行器的检测质量控制要点和控制措施，包括射线检测资格认定、材料管理、设备管理、检测工艺规范的制定、检测过程控制等内容。     

Transportation rates and plant location in oligopolistic competition with sequential entry

This paper examines the impact of quantity-discounted transportation rates on location patterns of oligopolistic competition with sequential entry. When transportation rates are constant, Hwang and Mai (1990) show that the entrant locates at the same point as the existing firms if the production function exhibits constant returns to scale. The entrant will locate farther away from (closer to) the market than the existing firms do if the production function exhibits increasing (decreasing) returns to scale. This paper shows that Hwang and Mai's results need not hold when transportation rates are a function of quantity shipped and distance traveled.     

《建筑给水排水及采暖工程施工质量验收规范》探讨

在分析《建筑给水排水及采暖工程施工质量验收规范》特点的基础上,对新规范中七个方面的内容进行了分析和研究,指出了其中的不足和应改进的方案。     

基于完整性管理的油气管道施工质量评价

基于施工质量在管道完整性管理中的重要作用,提出了对油气管道施工质量进行科学合理评价的新方法。并对影响管道施工质量的焊接、防腐和埋设三个主要方面及其相关的质量影响因素进行了简要分析。根据实际情况与专家打分,应用多级模糊综合评价模型对某一埋地管道施工质量进行了综合评价。最后对提高施工质量提出了参考建议。     

工程报验在西部管道工程中的应用

对长庆石油勘探局建设工程总公司在西部管道工程中建立的报验模式作了介绍，并对运用报验来达到控制工程质量作了阐述。指出工程报验是质量控制的重要环节。     

倏逝波在一维氧化硅亚微米波导线中传输特性的研究

[HTK]基于光学倏逝波原理的光纤或波导传感器是目前光学传感器领域的重要发展方向之一,而倏逝波在其中的传输特性是决定该类传感器敏感特性的关键因数.利用倏逝场理论分析了直径102～103nm的一维氧化硅亚微米光波导在其直径与外部介质(折射率)变化时倏逝波的穿透深度.实验结果表明,亚微米光波导的传输损耗将随着波导尺寸和外部环境折射率的变化而变化,倏逝波的传输方式非常适用于高灵敏度探测,可应用于光化学传感器和生物化学传感器的设计.     

Evolution of the international air transportation country network from 2002 to 2013

In this research, we analyze the evolution of the international air transportation country network from 2002 to 2013 with two perspectives: The network’s physical topology and the functional network with traffic information. Our analysis shows that the network is scale-free and has the small-world property. The evolution of triadic properties suggests that the network gears towards symmetric, transitive closure. We find that United States, Great Britain, and France are critical from both perspectives; Surprisingly, South Africa is particularly critical from topological point of view. Furthermore, topological and functional criticality are highly correlated to the GDP of a country.     

How air transport connects the world – A new metric of air connectivity and its evolution between 1990 and 2012

To understand as to how scheduled air services link a region to other markets, we develop connectivity and hub centrality metrics. These metrics measure the quality of all scheduled air services in terms of frequency, detours, layover time and destination quality using a valuation scale being derived from observed passenger behavior. By computing yearly scores for 1990 to 2012, we analyze the geography of and trends in worldwide connectivity and hub centrality. While we observe significant growth of aggregate connectivity, the trends are heterogeneous with regard to the type of connectivity as well as time and location.     

论铁路货运向现代物流转变

随着我国高铁的快速建设，以及铁路货运机制的不断改革，铁路货运发展现代物流存在非常好的机遇。铁路运输为了提高市场份额，适应市场需求，应采取众多改革方针。通过运用SWOT方法，对我国铁路货运发展现代物流进行了分析，指出了其存在的优势、劣势、机遇与威胁，并提出铁路货运在发挥自身优势、优化货运组织的同时，要充分利用路网资源，进一步加强铁路货运改革，优化两端运输组织，完善“门到门”物流运输，积极拓展铁路货运增值业务，大力发展协同运输，为铁路货运发展现代物流提供有力保证。