关于英国皇家导航学会及《导航期刊》

英国皇家导航学会（RIN）是一家带有慈善性质的学术性组织，于1947年戊立于伦敦，一直以来它是世界导航学会的领导者学会的目标是集聚全球范围内对航海导鬏技术感兴趣的专家，以推动导航在各个领域的发展，同时提高导航科技的公众感知度在国际海事组织（IMO）中RIN还代表看国际导航学会联合会，对推动海上导航技术和实践有着重要影响     

青岛至济南客运专线项目

1项目概况青岛—济南客运专线位于山东省境内,东起海滨城市青岛,向西经潍坊、淄博至山东省省会济南,全长362.50km。1.1项目建设的必要性胶济客运专线是太青客运专线的东段,与既有胶济线共同构成胶东半岛东西向铁路客货运输的主干线,是我国铁路“四纵四横”快速客运网“青岛—石     

铁路航测遥感管理工作

航测遥感技术自全面在铁路系统推广应用以后,铁道部成立"铁路航测和遥感科技情报中心",为促进航测遥感专业科学技术的应用发展和为生产、科研及领导决策服务.20多年来,"航遥中心"代铁道部做了许多卓有成效的工作,为推动航测遥感技术在铁路建设中的应用起到了积极的作用.     

中华人民共和国铁道部2005年铁道统计公报

2005年是铁路改革和发展取得巨大成就的一年。在铁道部党组领导下,全路认真落实科学发展观和党中央、国务院部署,以服务经济社会发展大局为己任,以铁路跨越式发展为契机,在积极推进铁路基础性改革的同时,着力加快铁路建设,大力提升装备水平,努力挖潜提效增收,运输安全形势稳定,     

Altruism,selfishness and coastal resources

Abstract

The basis for coastal zone management in the United States is established in legislation. In comparison, Canadian federal and provincial governments have adopted a piecemeal approach for managing a variety of concerns examined here: water quality, ecological protection, public access, aesthetics, natural hazards, and water dependency. As a result of this approach, which is characterized by a minimum of federal, provincial, and interjurisdictional coordination, the British Columbia coastal zone is showing signs of stress. For example, major shellfish harvesting areas are being lost to water pollution; ecologically sensitive habitats are being consumed by urban, commercial, and industrial expansion; recreation and tourism opportunities are being impaired by clear cutting and other inappropriate developments; and infrastructure is allowed in flood and erosion‐prone areas. Recommendations to improve the approach to coastal management in British Columbia include a variety of innovations. New federal and provincial policies, legislation, institutions, and experimentation with local and regional integrated resource planning are required to better govern the coastal zone. Increased support for existing agencies, public involvement, and access to information as well as more common use of environmental impact studies are needed to justify proposed coastal developments.     

框架式钢管混凝土桥墩非线性地震反应分析

以框架式钢管混凝土桥墩及钢筋混凝土空心薄壁墩为研究对象,采用纤维单元建立了框架式钢管混凝土桥墩及钢筋混凝土空心薄壁墩的非线性动力分析模型,输入3条地震波,计算得到了框架式钢管混凝土桥墩与钢筋混凝土空心薄壁墩的线性及非线性地震时程响应,比较了不同类型桥墩地震响应的差异,讨论了框架式钢管混凝土桥墩的地震反应特点。     

Short-term work team scheduling models for effective road repair and management

Abstract

In this study, we focus on the development of work team routing/scheduling models incorporating stochastic travel and repair times. Robust and expected optimization concepts, combined with a time–space network technique, are used to develop the models. We perform numerical tests based on operational data for Taoyuan County in Taiwan. The test results show the good performance of the models.     

BFRC-RCC复合路面的有限元分析

建立了玄武岩纤维混凝土（BFRC）-碾压混凝土（RCC）复合路面结构有限元计算模型,分析了上、下层BFRC和RCC板的厚度、弹性模量,以及基层顶面当量回弹模量对BFRC-RCC复合路面荷载应力和温度应力的影响规律,并提出减小板底应力的建议。     

可逆直流PWM调速系统设计

自动化控制系统已经在各行各业得到了广泛的应用和发展,而直流调速控制作为电气传动的主流在现代化生产中起着主要作用。为了对可逆直流PWM调速系统进行了较深入的研究,从直流调速系统原理出发,逐步建立了可逆直流PWM调速系统的数学模型。所设计的系统基本满足要求。     

基于kriging代理模型的碰撞安全性稳健性分析

针对材料和制造工艺等不确定因素,并为提高汽车碰撞安全性稳健性分析的效率,采用基于kriging代理模型的稳健性分析方法,研究材料不确定性对某款轿车前纵梁碰撞安全性能的影响.结果表明,材料特性的不确定性对前纵梁峰值碰撞力影响较大;基于kriging模型的稳健性分析的精度和效率比采用有限元模型时要高.