倒尺不应在机场高程测量中消失

本文着重谈了倒尺的工作原理、结构和使用方法以及它存在的优缺点和适用范围；并对开发和研制倒尺提出了自己的见解。     

改变显示处理器主机IP地址脚本的编写

由于受资金限制，目前空管自动化系统设备除必要备份外，都不会有太多主机冗余，特别是应急系统，大多没有冗余显示处理器主机。我们杭州自动化应急系统情况类似，全部显示处理器主机都处于在线使用状态，无一冗余。这样就出现一个需要考虑的问题，当重要管制席位的显示处理器主机遇故障时，如何实现其正确、方便、快捷的物理换位？     

AWA信标设备维护维修经验点滴

本文针对澳大利亚生产的AWA信标设备，介绍了几种简单的故障维修方法，并结合笔者的实际工作实践，详细介绍了几则故障判断实例，为同类型信标设备的维护维修提供了经验。     

电子器件系统维护的优化模型

本利用变分法原理给出复杂联接状态下电子器件系统维护的优化模型，寻求维护时刻间的最优值，并得到最优的平均维护时间周期。     

全面维护 悉心照顾

全面维护是罗·罗公司与客户签署的提供产品和服务以满足客户的独特要求的协议,即全面维护=产品 服务,按发动机飞行小时收费。     

数据传输卡插拔互换性技术探讨

介绍了数据传输卡(DTC)插拔互换性技术有关的几个问题。在产品有使用延续性要求的限制下,在不提高原零部件制造精度和不改变原装配方式的条件下,提出了按照模拟量传递原则而建立的标准体系——装配检验对合平台,并以此在生产中实施,满足了产品使用互换性要求。同时提出了一种新型弹顶组件的设计,使弹顶位置更合理,弹顶更可靠,从而进一步提高了产品插拔可靠性。     

激光武器已接近作战使用

美国多种类型激光武器的研究正取得突破性进展，并向着能实际应用的方向发展，估计不久的将来这种武器就会装备美国武装部队，从而对作战方式产生革命性的影响。     

Performance deterioration modeling and optimal preventive maintenance strategy under scheduled servicing subject to mission time

Servicing is applied periodically in practice with the aim of restoring the system state and prolonging the lifetime. It is generally seen as an imperfect maintenance action which has a chief influence on the maintenance strategy. In order to model the maintenance effect of servicing, this study analyzes the deterioration characteristics of system under scheduled servicing. And then the deterioration model is established from the failure mechanism by compound Poisson process. On the basis of the system damage value and failure mechanism, the failure rate refresh factor is proposed to describe the maintenance effect of servicing. A maintenance strategy is developed which combines the benefits of scheduled servicing and preventive maintenance. Then the optimization model is given to determine the optimal servicing period and preventive maintenance time, with an objective to minimize the system expected life-cycle cost per unit time and a constraint on system survival probability for the duration of mission time. Subject to mission time, it can control the ability of accomplishing the mission at any time so as to ensure the high dependability. An example of water pump rotor relating to scheduled servicing is introduced to illustrate the failure rate refresh factor and the proposed maintenance strategy. Compared with traditional methods, the numerical results show that the failure rate refresh factor can describe the maintenance effect of servicing more intuitively and objectively. It also demonstrates that this maintenance strategy can prolong the lifetime, reduce the total lifetime maintenance cost and guarantee the dependability of system.