Airline delays,congestion internalization and non-price spillover effects of low cost carrier entry

This paper develops an econometric model of flight delays to investigate the influence of competition and dominance on the incentives of carriers to maintain on-time performance. We consider both the route and the airport levels to inspect the local and global effects of competition, with a unifying framework to test the hypotheses of 1. airport congestion internalization and 2. the market competition-quality relationship in a single econometric model. In particular, we examine the impacts of the entry of low cost carriers (LCC) on the flight delays of incumbent full service carriers in the Brazilian airline industry. The main results indicate a highly significant effect of airport congestion self-internalization in parallel with route-level quality competition. Additionally, the potential competition caused by LCC presence provokes a global effect that suggests the existence of non-price spillovers of the LCC entry to non-entered routes.     

基于PC与S7-200 实现自由通信协议的研究

以西门子S7－200 226型PLC（可编程控制器）在沥青混凝土搅拌站电控系统中的应用为例，研究如何在PC与PLC之间确定自由通信协议和采用Visual Basic和SIEMENS Step7实现自由通信协议。     

地铁牵引供电框架保护及功能性改造

针对广州地铁1号线不能远程区分框架保护类型和不能远程复归的状况,结合西门子S5系列PLC技术、SINAUT技术、牵引供电技术,对框架保护进行功能性改造,大大减少了框架保护故障的处理时间.改造技术方案主要通过研究数据的传递方式、协议转换、控制逻辑关系,修改组态软件、监控程序、接口程序、PLC程序的方式来实现.     

可视化桥梁结构计算系统VMAS

可视化桥梁结构计算系统ＶＭＡＳ是用ＶＢ５写成的全中文３２位Ｗｉｎｄｏｗｓ应用软件，它集建模、计算、结果查询于一体，具有静力、动力和屈曲分析功能。文章介绍了系统的功能、特点、设计原理和实现方法。     

基于多工况船舶的简易导管螺旋桨程序设计

介绍了使用VB语言编制的JD75及JD7704 Ka系列简易导管螺旋桨设计的程序.该程序根据多工况船舶螺旋桨选择设计工况的特点,提供了两种设计模式供用户选择,以此达到选择较佳设计工况的目的;引用AutoCAD对象库提供的方法帮助完成设计过程中的一些计算.     

MatrixVB组件在集装箱船舶配载系统开发中的应用

针对集装箱船舶配载系统开发过程中数据处理运算量大的要求,从MatrixVB组件和VB的特性出发,提出了运用VB与MatrixVB结合进行数据处理的技术。并以实例进行讨论,结果表明,此方法编程思路简单,是程序开发的很好方法。     

广州轨道交通五号线盾构施工关键技术

研究目的：解决广州轨道交通五号线盾构施工面临的诸多难题，总结在复合地层中盾构施工的若干经验，为类似工程提供借鉴。研究方法：通过工程类比、现场试验及监测等手段，对盾构施工相关工法、材料及技术等进行了引进、研究和实践。研究结果：广州地铁五号线大坦沙南-中山八站盾构区间首次成功应用了盾构始发SEW工法，并完成江中超浅埋泥水盾构过江掘进；火车站-小北站盾构区间顺利通过溶洞群，填补该项国内空白；动物园站-杨箕站盾构区间超小曲线半径掘进技术实现了新的突破；车陂南站-东圃站盾构区间首次成功应用了TAC高分子聚合物，辅助盾构顺利通过浅埋砂层。研究结论：广州地铁五号线盾构施工关键技术，有效控制了土体稳定和变形，在环境岩土工程问题防治方面取得了较大进步。     

城市轨道交通列车驾驶仿真器研究

城市轨道交通列车驾驶仿真器是城市轨道交通部门进行技能培训的高科技设备,能够进行精确的列车操纵性能仿真和逼真的列车驾驶环境仿真。基本功能包括模拟操纵功能、列车动力学计算功能、故障判断培训功能、视景和声音仿真功能以及运动仿真功能。针对城市轨道交通特点,给出了轨道交通列车驾驶仿真器的运行仿真数学模型,提出采用分布式计算机体系结构、MPEG视频压缩技术和基于DirectSound技术的多媒体声音系统,设计具有4层5自由度液压运动平台的驾驶仿真器。并基于以上技术完成了北京地铁交流传动电动客车列车驾驶仿真器的研制,成功应用于北京地铁技术学校学员和北京地铁司机的教育培训。     

基于AUTOCAD的电气原理图综合系统的开发

为能实现电气图纸信息的数字化，将传统的AUTOCAD绘图方式与CADDS5电气设计进行了较好的融合，从而实现了在AUTOCAD环境下绘制电气原理图，取代了在CADDS5电气模块中原理图繁琐的输入环节。     

The small-sized benthic biota of the Håkon Mosby Mud Volcano (SW Barents Sea slope)

R/V POLARSTERN expedition ARK XVIII/1 in summer 2002 provided the opportunity to carry out a sampling programme to assess the activity, biomass and composition of the small-sized benthic biota (size range: bacteria to meiofauna) around the active mud-oozing and methane-seeping Håkon Mosby Mud Volcano (HMMV) on the SW Barents Sea slope, Northern North-Atlantic. A total of 11 stations, covering different areas (e.g., bacterial mat sites, and pogonophoran fields) within the crater, and sites outside the caldera were sampled using a multiple corer. Subsamples were analyzed for various biogenic compounds to estimate the flux of organic matter to the seafloor (sediment-bound chloroplastic pigments indicating phytodetritus), activities (bacterial exo-enzymatic turnover rates) and the total biomass [from bulk parameters, like phospholipid (PL) concentrations in the sediments] of the smallest sediment-inhabiting organisms (range: bacteria to meiofauna). Direct investigations of bacterial numbers and biomasses as well as on meiofauna densities and composition completed our investigations at HMMV. As expected for a comparable small deep-sea area with only minor disparity in water depth between sampling sites, our investigations revealed generally no significant differences in organic matter input from phytodetritus sedimentation between sampling sites inside and outside HMMV. Bacterial exo-enzymatic activities as well as total microbial biomass (TMB) and meiofauna densities, however, exhibited generally higher values at HMMV, compared to sites outside the mud volcano. Enhanced benthic life at HMMV is based on chemosynthetic processes, making the mud volcano a “chemosynthetic oasis” in an otherwise oligotrophic deep-sea environment. As we did not find any indication for bacterial symbioses in the meiofauna, comparably rich meiofaunal assemblages at HMMV are presumably indirectly related to a general enhanced biological production.