抗强冲击测量仪器缓冲平台技术

试验测量仪器的安装环境需满足其正常使用的特殊环境要求。本文针对强冲击环境下所使用的测量仪器的安装平台进行了冲击防护设计,测量仪器缓冲平台是采用具有大变形能力的空气弹簧配合空气阻尼腔支撑的一种弹性支撑平台,并根据用电情况在平台上集成了UPS大功率不间断电源。经缓冲平台冲击仿真技术研究及双波冲击机试验验证,其所承载的测量仪器可以满足在严酷环境预报下的正常使用。     

空调压缩机提前失效的原因分析及改进措施

对客车空调压缩机提前失效进行原因分析,并提出改进措施。     

重视空气滤清器的安装位置

通过对由于空气滤清器安装位置不当造成发动机的充气效率ηv降低的分析,提出妥当安装空气滤清器的建议。     

精确制导武器的克星-激光防空武器

未来防空作战的环境越来越严峻,提高防空能力迫在眉睫,本文指出激光防空武器相对其它防空武器更适合防空反导作战,是精确制导武器的克星,同时介绍了激光防空武器的种类、研制装备情况。     

某特种船空调系统设计

本文详细介绍了某特种船空调系统的组成、功能、布置等的设计。     

钦州港大榄坪散杂货泊位工程的环境保护措施

环境保护监理是近年来监理工程师的主要工作之一,文章通过对钦州港大榄坪1#、2#散杂货泊位工程施工中存在的环境问题进行分析,提出了防治环境污染的监理措施和方法。     

活塞式压缩机故障诊断方法

在分析活塞式压缩机常见各类故障及诊断方法的基础上,研究热力参数法、振动声学法和油液分析法的工作原理、实施难点及适应范围,为采用适宜的方法诊断活塞式压缩机故障提供选择的基础．     

船用空压机冷却系统结垢现象的探索及防治措施

随着大型船舶的不断涌现,空压机作为船舶上使用的一种辅机,在船舶操纵控制和自动化方面的地位和作用愈显重要.为保证空压机长期稳定高效地运行,必须对其冷却系统内存在的结垢现象加以足够的重视.文章主要针对此结垢现象,分析了形成的原因及可能造成的危害,并提出了一系列防治措施.     

空气压缩机启动异常的故障分析与排除

文章就某船空气压缩机出现启动困难,启动电流过大的现象,据此对电磁卸荷阀的结构和工作原理进行分析,并提出了修理方法。     

A model to identify airport hubs and their importance to tourism in Brazil

Air transportation in Brazil has been recently liberalized and one of the consequences of this process is the concentration of flights in a few hubs. During the years 2006-2007 two fatal accidents created unprecedented chaos in both land and air sides of the system with harmful consequences to tourism in Brazil. The consequences were more airport congestion and many episodes of flight delays and cancellations that lasted for several months. We argue that, among other factors, this state of blackout was a result of the increase in the degree of concentration in few airports, particularly Congonhas (in São Paulo) and Brasília. Using data obtained from a survey with Brazilian experts, a comparison was made with two existing methods (the one used by the US Federal Aviation Administration and the usual Herfindahl-Hirschman method) in order to calculate the number of hubs in Brazil. Due to the huge discrepancy obtained between data from the survey and the other two methods considered, a new mathematical method based on the Herfindahl-Hirschman Index was proposed to identify the number of hubs in a given network. Drawing from the examples of what happened to tourist destinations during and after the air transport crisis in Brazil, the article concludes discussing the need for a more accurate tool to identify and to monitor the concentration of flights at the Brazilian air transportation network and its importance to tourism.