新建机场水泥混凝土道面厚度对弯沉的影响分析

为研究新建机场水泥混凝土道面厚度对弯沉的影响,文中对新建成都天府国际机场道面进行了重型落锤式弯沉仪(HWD)测试,并分析了道面板不同板厚和不同位置处的典型弯沉盆,对比了不同厚度道面板的板边弯沉和板中弯沉,以及板角弯沉和板中弯沉的比值。结果表明,对新建水泥混凝土道面来说,厚道面周围弯沉衰减速度较慢,道面厚度对板边弯沉/板中弯沉和板角弯沉/板中弯沉基本无影响。     

机场跑道容量评估模型和估计方法的进一步研究

从管制员的角度出发，给出了跑道容量的定义，分析了影响跑道容量的因素，建立了到达和离场容量估计模型，给出了多种情况下跑道容量的计算方法，针对首都国际机场跑道的实际，开发了机场跑道容量评估系统，仿真结果验证了所提模型和方法的可行性。     

基于灰色模型的成都双流机场物流预测

准确进行机场物流预测是机场规划的重要前提.但从目前机场物流的预测现状看,许多机场都存在预测值高于实际值的情况.文中在分析现有机场物流预测模型不足的基础上,利用灰色系统理论,建立了成都双流机场货、邮吞吐量的预测模型.通过实际数据与预测结果的比较,证明灰色模型对于双流机场货、邮吞吐量的预测具备可行性,同时具有较高的精度.     

遗传算法在终端区飞机排序中的应用

研究了遗传算法在终端区跑道分配以及飞机排序中的应用，建立了多条跑道多架飞机排序的数学模型，并进行了算例仿真分析。仿真结果表明，遗传算法与先到先服务排序相比较，适应度增加了80％，延时减小了40％，说明遗传算法的排序结果优于先到先服务的排序结果。     

南通兴东机场发展战略分析

采用SWOT分析法,分析了南通机场所面临的经济、政策等方面机遇和市场威胁,结合机场独特的区位优势和可持续发展的基础条件,建议公司应主动接触上海机场集团有限公司,近期定位为客货两用支线机场;中远期定位为上海国际航空枢纽的组合机场、客运支线枢纽机场、国际货运机场;最后,提出了南通兴东机场实施该发展战略需要做的一些工作建议。     

民用机场建设项目推行代建制探讨

简述了项目代建制的概念及优点,分析了我国民航机场建设项目管理的现状及存在的主要问题,提出了机场建设实行项目代建制的实施方式,指出了实行代建制应该注意的相关事项。     

Optimization of road investments based on accessibility criteria using a dynamic programming model

This paper discusses the use of the concept of dynamic programming to the determination of road construction needs using accessibility criteria. An attempt is made to specify political and social goals such as quality of life and equal opportunity as parameters of road dimensioning. The objective of the method which is illustrated by a case study is to determine minimal total costs for various threshold values of conceivable accessibility standards.     

青藏高原地区玉树机场边坡生态防护探索

根据高原的生态条件、工程情况,选择高原机场边坡生态防护的草种,探讨了高原机场边坡生态防护的一般方法。并以玉树民用机场为例,设计了边坡生态防护方案并指导试验段施工,根据防护结果验证了边坡生态防护的可行性。     

Deconstructing delay: A non-parametric approach to analyzing delay changes in single server queuing systems

This paper introduces an empirically driven, non-parametric method to isolate and estimate the effects that changes in demand and changes in throughput have on delay – in particular, arrival and departure flight delay at airport runways. Classic queuing concepts were used to develop a method by which an intermediate, or counterfactual, queuing scenario could be constructed, to isolate the delay effects due to shifts in demand and throughput. This method includes the development of a stochastic throughput function that is based entirely on data and has three key features. Firstly, the function relies on non-parametric, empirically-based probability distributions of throughput counts. Secondly, facility capacity needs not be explicitly defined, as it is implicitly included in the probability distributions of throughput. Thirdly, the throughput performance function preserves the effect of factors that cause capacity (and, therefore, throughput) to fluctuate over a given period. Temporal sequences of high, moderate, and low capacity are maintained between the observed and counterfactual scenarios. The method was applied to a case study of the three major New York area airports of LaGuardia (LGA), Newark Liberty (EWR), and John F. Kennedy (JFK), using operational data extracted from the Federal Aviation Administration’s (FAA’s) Aviation System Performance Metrics (ASPM) database. The focus was on the peak summer travel seasons of 2006 and 2007, as these airports experienced record levels of delay in 2007. The results indicate that decreases in both demand and throughput were experienced at LGA and EWR, although the decreases in throughput had more significant effects on operational delays as they increased overall at these airports. At JFK, the increase in departure throughput was not sufficient to offset the increase in departure demands. For arrivals, demand increased and throughput decreased. These trends caused a significant growth in delay at JFK between 2006 and 2007.     

贵州山区高速公路滑坡类型及特征分析

贵州山区高速公路建设中出现的滑坡主要有破碎岩体滑坡、堆积体滑坡、基岩顺层滑坡、填方路基滑坡等。介绍了不同地质条件下工程建设产生的滑坡类型、规模及影响,分析了滑坡的诱发因素,阐述了勘察设计过程中的重点和难点,以及采取的处治措施等。