加赠郑和以"外交家"的桂冠

自190 4年梁启超发表《祖国大航海家郑和传》以来,史学界根据新发现的遗迹及史料,翔实证明和评价郑和为中国明代大航海家是中肯的,毫无异议的。但是在郑和下西洋的目的这一命题的学术争鸣中,却众说纷纭,有踪迹建文说、宣扬国威说、耀兵异域说、贸采琛异说、经营国际贸易说、朝贡贸易说等等,莫衷一是。笔者以为郑和七下西洋的使命,其目的是贯彻执行明成祖对外开放、和平友好、共享太平之福的外交政策,其次为航海贸易。据此笔者在文中缕述三条论据,以及郑和七下西洋的全部外交活动予以阐明。郑和七下西洋2 8年的历程,是以航海为载体,从事频繁的外交活动,架设起中国连接亚非各国的友谊桥梁,这在中国乃至世界航海史和外交史上,留下了璀璨夺目的一页,功不可没。因此笔者提出:对郑和历史地位和作用的评价,应在大航海家的桂冠之上,加赠明代杰出外交家的桂冠。     

143.5 m高墩液压翻模施工技术

随着高墩施工技术的发展,特大桥建设越来越多,墩身施工采用何种方法,许多施工单位都在进行不同方式的尝试。143.5 m高墩采用液压翻模技术施工,取得了成功。详细介绍了143.5 m高墩施工工艺。     

舰舰导弹战斗部发展研究

本文介绍了舰舰导弹战斗部的发展历程。围绕提高舰舰导弹战斗部的毁伤效率这一关键问题，参考有关文献资料，根据多年来的经验和理论成果，对舰舰导弹战斗部及其装药和引信的发展进行了分析与研究，并提出了主要发展途径。     

C50～C60海工耐久混凝土的试验研究

通过平板抗裂试验及RCM法研究了海工耐久混凝土的早期抗裂性与抗氯离子渗透的能力。结果表明,使用P.Ⅱ42.5硅酸盐水泥、Ⅱ区中砂5、~25 mm碎石、Ⅰ级或Ⅱ级低钙粉煤灰、粒化高炉矿渣粉及新一代高性能高效减水剂可以配制出C50~C60海工耐久混凝土。     

关于衡量严格执法标准的思考

从交通管理者的角度出发,结合公安交通管理工作实际经验,探讨了衡量严格执法的标准,提出了如何建立更加科学的衡量严格执法的评价体系。     

建筑企业知识共享障碍分析及对策

引用博奕论,本文从囚徒困境的角度分析了建筑企业实施知识共享存在的问题,从三种模式上阐明建筑企业内部开展知识管理的策略与措施,并专门设立CKO,促进知识共享,对建筑企业外部实行虚拟企业联盟应注意问题进行了阐述,确保知识共享的顺利进行。     

A study on the resistance force and the aerodynamic drag of Korean high-speed trains

The resistance force as well as the aerodynamic drag of Korean high-speed trains including two commercial trains, the KTX and the KTX-Sancheon (KTX-II) and two experimental trains, the HSR-350X and the HEMU-430X have been studied comprehensively. To deduce the aerodynamic drag of the trains, the coefficients of the Davis equation, which is a universal formulation to represent the resistance to motion of the train, have been calculated using the coasting test method and analysed in comparison with those by empirical prediction methods. In case of HEMU-430X train, the equations of resistance to motion have been calculated by an alternative regression method that is established in this study. The results show that the suggested method can successively yield the resistance to motion equation from the coasting test measurements with varying air density by separating the aerodynamic drag from the total resistance of train. It also prevents from improper coefficients which are occasionally taken by normal regression method in irregular coasting condition. After yielding the aerodynamic drag of the trains from the resistance to motion equations, characteristics of the aerodynamic drag have been analysed and compared between the trains.     

一种基于二叉树的P2P网络查找算法

针对P2P网络中资源查找以及其自身存在的问题,提出了一种基于二叉树的P2P网络模型。该模型借鉴了可信计算中的直接匿名认证机制、DHT、超级节点的思想,在此基础上设计了一种高效的可扩展查找算法,解决P2P网络查询延迟、冗余信息、可扩展性等关键问题。模拟实验表明,该算法能够有效减少网络带宽消耗并能显著提升P2P网络的查找效率。     

村村通油（水泥）公路养护管理中存在的问题及对策

通过分析河北省村村通油（水泥）路工程在公路管养方面存在问题,找出存在问题的主要原因,并提出相应的对策,对其他地区村村通公路工程的管养提供借鉴的经验。     

Estimation of the determinants of bicycle mode share for the journey to work using census data

A model is presented that relates the proportion of bicycle journeys to work for English and Welsh electoral wards to relevant socio-economic, transport and physical variables. A number of previous studies have exploited existing disaggregate data sets. This study uses UK 2001 census data, is based on a logistic regression model and provides complementary evidence based on aggregate data for the determinants of cycle choice. It suggests a saturation level for bicycle use of 43%. Smaller proportions cycle in wards with more females and higher car ownership. The physical condition of the highway, rainfall and temperature each have an effect on the proportion that cycles to work, but the most significant physical variable is hilliness. The proportion of bicycle route that is off-road is shown to be significant, although it displays a low elasticity (+0.049) and this contrasts with more significant changes usually forecast by models constructed from stated preference based data. Forecasting shows the trend in car ownership has a significant effect on cycle use and offsets the positive effect of the provision of off-road routes for cycle traffic but only in districts that are moderately hilly or hilly. The provision of infrastructure alone appears insufficient to engender higher levels of cycling.