rAutoCAD线型二次开发在工程制图中的应用

AutoCAD软件系统中提供了标准线型文件,同时也为用户的二次开发留出了接口,即用户可以定制自己的线型文件以满足不同的需要。文章简要介绍了开发线型文件和形文件的基本方法,并介绍了工程制图中堤防线、铁路线、长城符号等几种常用线型的定义方法。     

铁路军事运输动态监控系统基础信息平台

根据军交动态监控系统的研发要求,结合系统设计思想以及多种开发方法,设计了一套基础信息平台.对该平台功能进行了需求分析和设计,指出了在设计过程中所要解决的统一数据编码、图片数据加解密和空间基础信息维护等关键解决方案.     

一种基于网络书签的个性化信息推荐方法

针对目前Internet上信息的爆炸式增长,提出了一种基于Web挖掘的个性化信息推荐方法,介绍了个性化推荐的流程和实现模型,并借鉴复杂网络中的社团结构划分方法,提出了基于网络书签的个性化信息推荐方法,分析了社团内基于协作过滤和社团间基于"信息桥"的个性化信息推荐,并通过实验验证了此方法在个性化信息推荐中是有效的.     

基于单片机控制的HID车灯控制器研究与设计

分析车用HID灯的启动及过渡过程,提出一种HID灯控制器控制策略,内置单片机微处理器,能自动识别冷热灯类型,并藉此做出对应的控制策略,给出控制器设计思路,分析电路图原图,讨论软件控制流程编写算法,并给出流程图.样机测试效果良好,性能稳定.     

Quality of Service Improvement for High-Speed Railway Communications

With the fast development of highspeed railways, a call for fulfilling the notion of communication at ＂anytime, anywhere＂ for high-speed train passengers in the Train Operating Control System is on the way. In order to make a realization of that, new railway wireless communication networks are needed. The most promising one is the Long Term Evolution for Railway which will provide broadband access, fast handover, and reliable communication for high mobility users. However, with the increase of speed, the system is subjected to high bit error rate, Doppler frequency shift and handover failure just like other system does. This paper is trying to solve these problems by employing MIMO technique. Specifically, the goal is to provide higher data rate, higher reliability, less delay, and other relative quality of services for passengers. MIMO performance analysis, resource allocation, and access control for handover and various services in a two-hop model are proposed in this paper. Analytical results and simulation results show that the proposed model and schemes perform well in improving the system performances.     

不同曲线半径下刚构桥悬臂法施工受力分析

结合具体工程实例,利用有限元计算软件,对不同曲线半径和墩高的变截面曲线连续刚构桥最大悬臂状态空间应力及变形进行了分析,根据分析结果得出了设计、施工、监控方面的一些认识和建议。     

Direct displacement-based assessment with nonlinear soil–structure interaction for multi-span reinforced concrete bridges

A practical and readily implementable seismic assessment procedure for multi-span reinforced concrete bridges is introduced in this paper. The procedure is based on an existing direct displacement-based assessment (DDBA) approach, and accounts for nonlinear dynamic soil–structure interaction (NLSSI) effects. Several simplified bridge structures lying on shallow foundations have been used as application examples. The validation has been done by comparing DDBA+NLSSI with the results of finite-element nonlinear time-history simulations by means of incremental dynamic analysis. Moreover, the influence of NLSSI on the assessment procedure has been evaluated by considering the same bridges with fixed base and with NLSSI effects. In spite of its simplicity that presently prevents its use for complex bridge structures, the proposed procedure is found to provide fast and reliable results, useful to give a first-level screening on a large set of bridges for highlighting the most critical situations, as well as to carry out fast parametric analyses to produce fragility curves in the framework of performance-based vulnerability/risk assessment.     

铁路轴承成品清洗机设计

主要介绍了铁路轴承成品清洗机的设计方案和PLC控制的电气工作原理和意义。     

斜拉(悬索)特大桥主塔垂直度多断面检测方法

本文简要回顾了过去垂直度测定方法， 针对斜拉（悬索） 特大桥超高主塔的结构特点， 提出了桥梁超高主塔垂直度多断面检测方法， 旨在用更准确合理的方法检测主塔的垂直度， 客观地反映其外形施工质量， 为后期施工及管理提供可靠的数据。     

京沪高速铁路桥梁生态效应研究

京沪高速铁路86.5%的长度采用桥梁架空铺设的方式。与传统路基铁路比较，这种形式具有积极的的生态效应。首先基于宏观景观格局尺度，结合局部片段，通过定性和定量分析研究出桥梁形式对自然廊道和斑块的生态影响较小。并进一步从中、微观尺度上，依据生态设计原则提出桥梁与生态相关的要素及其设计要求，并结合京沪铁路的典型桥梁进行分析。在此基础上，提出铁路后期运行中进一步减少生态影响的控制和优化策略，保证京沪高速铁路桥梁的生态效应能得以持续发挥。