异步接口模式及其应用

In distributed systems,high efficiency can be achieved using asynchronous API between client and server.This paper provides an architectural pattern that implements asynchronous API generally. Asynchronous methods donot execute operations directly,however,they delegate the sending and receiving process to individual threads via aqueue ,the client deals with results by means of callback ,wait or check. Synchronous API is implemented on the baseof asynchronous API. Presently the asynchronous API pattern has been employed in the implementation of messagequeue middleware ISMQ.

高铁有砟线路信号设备运用十年的现状及维护探讨

信号设备是铁路行车安全的重要组成部份,是实现控制列车运行的关键设备,阐述高铁有砟线路信号设备运用十年的既有现状,分析设备随着使用年限的增长,逐渐出现不良影响的原因,同时指出在维护过程中面临的实际问题,并提出相应的建议及针对性的整治措施,帮助现场提高信号设备维护质量,减少因故障从而导致对铁路行车运输造成干扰。

变宽箱梁桥支座计算分析

变宽箱梁的构造、力学特点与等截面箱梁有很大区别,在运用程序建模分析中选择合适的方法对结构分析的精确度有较大的影响,因此,通过对某变宽箱梁桥进行梁格法和单梁法的建模分析对比,得出了对实际工程有指导意义的结论。