浅议真空压浆施工技术

该文介绍了真空压浆施工工艺,提出了解决预应力管道压浆不饱满造成钢绞线腐蚀的措施及手段,根除了桥梁隐患,提高了桥梁的耐久性和安全性。     

静水压力下圆柱壳结构屈曲机理分析

针对静水压力下圆柱壳结构的屈曲机理问题,将圆柱壳的结构刚度分为薄膜刚度和弯曲刚度,分析了具有完整刚度下圆柱壳的失稳压力,并与已有的理论进行了比较,验证了方法的可靠性。通过消除圆柱壳结构各部分薄膜刚度获得了消除刚度后的临界屈曲载荷,分析了各部分薄膜刚度对静水压力下圆柱壳承载能力的影响,结果表明,静水压力下圆柱壳屈曲的原因是结构周向薄膜刚度的减少。     

无人水下航行器外热源热机用无气体产生燃料

无人水下航行器(UUV)在军事领域正得到愈发广泛的应用,动力装置是其技术难点之一。无人水下航行器采用外热源热机,在续航力和航速上,都优于其他类型动力装置,且使用无气体产生燃料,可从根本上解决水下气体排放问题,提高航行隐蔽性,具有良好的军事应用前景。本文根据无人水下航行器的使用条件和技术要求,对适用于无人水下航行器外热源热机的无气体产生燃料进行了广泛考察,给出了可用于无人水下航行器外热源热机的无气体产生燃料和氧化剂的组合。     

Transport policy prioritisation for Dublin

Internalisation of the external costs of transport is currently the subject of much debate. Estimation of costs such as those of pollution and congestion is a primary element in any strategy involving policies for use in the internalisation of these costs. The objective of the TRENEN II STRAN project, funded by the EU, was to develop a methodology for estimation of the marginal external costs of transport. The model developed during the project was used in a series of case studies. One of the case studies, that conducted for Dublin, is reported in this paper. A brief summary of the TRENEN approach is presented followed by the results for Dublin produced from policies such as Do Nothing, Uniform pricing (internalising external costs by means of fuel taxation), Congestion Pricing (cordon pricing) and a first-best policy, the Full Optimum where one assumes that the policy maker has perfect pricing instruments available. As one would expect, the model shows that the greatest reduction in traffic level and external costs would occur if it were possible to introduce a highly differentiated and sophisticated pricing system. Increased taxation on fuel is not an efficient policy as it does not address the marginal external costs of congestion in a way that time-differentiated road-use pricing would. The results from testing of the different measures are interesting particularly those relating to parking and the way in which residents within the CBD and commuters to the CBD are dealt with. This revised version was published online in June 2006 with corrections to the Cover Date.     

外墙外保温系统保温层界面处理重要性及处理技术

该文阐述了,在建筑外墙外保温系统中,保温层界面处理对于保证系统的稳定性和安全性的重要意义.接着指出在外墙外保温系统的应用和施工中应当引起重视的事项并进行研究探索.最后提出若干有效的措施进行界面处理.     

浅说城市道路施工的质量控制

该文首先指出随着城市规模的不断扩大,城市道路的建设已经成为城市规划的主要组成部分。接着,提出在城市道路建设过程中,除了科学、全面、严密、精心地进行规划与设计之外,同时应严格编制项目质量计划,做到对外的质量保证和对内的质量控制,并采取必要的质量控制手段,做到对项目质量的实施和验证。     

墩身混凝土外观质量控制措施

针对南京大胜关长江大桥墩身混凝土外观质量要求，从模板设计、加工，混凝土配合比设计，混凝土拌和、浇筑、振捣及养护等方面提出了质量控制措施。     

先张桥梁混凝土传力柱式长线台座的优势及应用

结合吉安项目部先张桥梁混凝传力柱式长线台座设计和施工，对先张桥梁混凝土传力柱式长线台座的结构形式、特点、有关细节处理的技术措施、张拉与放张工艺、技术经济性方面进行了分析和论述，表明先张法混凝土传力柱式长线台座在实际施工中应用具有一定的科学性、适用性、安全性和经济性方面的优势。     

救生船A型门架基座及加强结构优化

研究了A型门架基座及加强结构的外载荷,采用有限元法计算了结构在各载荷组合工况下的应力。根据计算结果对结构进行了优化设计,从优化结果可见应力分布合理,强度均满足相应的应力衡准要求。该研究方法可为类似船舶的基座及加强结构设计提供技术支撑。     

20 MW LNG发电船方案设计与分析

针对靠港船舶清洁用电和部分港口、小型岛屿与海上平台等电力供应的快速响应问题，在阐述大型液化天然气（Liquefied Natural Gas，LNG）发电船发展现状及其主要系统基础上，引用国内外LNG船舶相关设计经验，采用模块化设计方法对20 MW LNG发电船的船体、LNG管路系统、电力-推进复合系统等进行设计，为该型船设计的主要难点问题提供可选的解决方案。