不规则波作用下斜坡堤越浪量试验研究

通过物理模型试验,研究不规则波作用下挡浪墙顶高度、宽平台长度及高度、波高和消浪墩等因素对越浪量的影响,发现挡浪墙、平台和消浪墩对减小越浪量有较好的作用。将现有计算越浪量公式值与实际物模试验值进行比较,推荐了越浪量计算方法。     

桑塔纳2000GLi型轿车点火系统故障诊断与排除

以桑塔纳2000GLi型轿车点火系统故障为例,分析点火系统工作原理,提出检测思路,确定故障原因,最终排除故障。     

Transportation planning and quiet natural areas preservation: Aircraft overflights noise assessment in a National Park

Global transportation growth causes several disproportionate impacts on the environment as, for instance, noise pollution which is related to negative effects on human health but also to quiet natural areas decline and biodiversity loss. Besides, sound is a component of ecosystems severely threatened by transportation noise disturbance which is related to negative effects on ecosystem functions. This study deals with aircraft noise impact on natural environments from a multiple innovative perspective. It complementarily combines: noise modeling, field measurements, soundscape audibility, human perception and spatial pattern tools for assessing the chronic growing outdoor noise pollution of ecosystems at landscape scale. Firstly, noticeable soundscape degradation from aircraft overflights has been found causing severe acoustic fragmentation and disruptions in the quietness of a national park in Spain (European Union). Air traffic caused sound pressure levels to increase by approximately 8 decibels from natural ambient levels. Secondly, spatial pattern tools together with noise mapping have been found to be useful in providing decision support for decisions-making through anthropogenic noise impact assessment on the natural environment. Finally, public opinion did not perceive aircraft noise-disruption as being as relevant as that quantified by technical procedures. Although 82% of visitors agree that anthropogenic noise pollution may negatively impact on conservation.     

武广客运专线无砟轨道工程施工工艺与设备配套探讨

研究目的:武广客运专线建设在我国铁路建设史上具有重要的意义,其轨道工程应用了从德国引进的RHEDA 2000双块式无砟轨道系统技术,该技术对于我国还是一项新技术、新工艺,也需要使用新设备,目前没有一套系统成熟的施工技术,需我们在建设中边施工边总结以供今后借鉴。研究结果:根据武广客运专线工程实际,结合前期参与同德方技术交流和施工设备引进谈判的工作经历,提出了一套比较系统的施工方法,为武广客运专线无砟轨道工程施工提供参考。     

ZPW-2000A闭环电码化工作原理及试验方法浅议

本文介绍了ZPW-2000A闭电码化在铁路运营中的重要作用，并分别对工作原理及现场施工中的试验环节进行了分析，提出闭环检查条件应用于进出站信号机控制电路的必要性。     

Efficient Rate Control for Motion JPEG2000 under Constraint Memory

IntroductionRate control is essential to video transmissionthrough heterogeneous lossy networks and time-varying communication channels.In recent years,scalability has gained more attention as a highlydesirable feature of some video coders,such asMPEG-4and Motion JPEG2000.Scalability canprovide not only precise rate control for constantbitrate(CBR)traffic,but also accurate qualitycontrol for variable bitrate(VBR)traffic,whenthe coder adopts different rate control algorithm.The rate contr…     

Word2000的操作使用经验浅析

Word2000是我们在日常工作中经常使用的文字处理软件。在编辑中，Word2000看似“平淡”，其实其中隐藏着不少的小奥妙。本文以作者在工作中遇到的问题及解决方法为例，介绍Word2000软件使用的小技巧。     

单线区段车站到发线电码化设计探讨

简述单线区段到发线车站电码化的设置原则,对到发线叠加ZPW-2000系列电码化设计的2种主要类型进行分析,对电路存在的问题提出改进意见,进行小结。     

ZPW-2000A无绝缘移频自动闭塞试验方法介绍

本文介绍了ZPW-2000A无绝缘移频自动闭塞工程调试中实验程序及实验方法。     

武广客运专线无砟轨道工程施工设备的投资与管理

研究目的:武广客运专线建设在我国铁路建设史上具有重要的意义,其设备的投资与管理对于双块式无砟轨道工程的施工至关重要,因此需要研究。研究结果:通过分析武广客运专线无砟轨道工程的施工特点以及设备的需求情况,认为必须高度重视设备的投资与管理,并且针对不同的情况采取不同的措施,开展探索新的设备投资模式、加强专业人才培养等方面的工作来完成科学合理的设备投资与管理,通过无砟轨道工程的施工增加人才技术储备,增强竞争能力,促进企业持续发展。