Influence of sway motion on passive anti-rolling tank

1Introduction Thepassiveanti rollingtankisoneoftheshipstabiliz erssuccessfullyusedallovertheworld.Itisapplicable toreducetherollingatanyspeed,especiallyfitsfor theshipsatlowspeedorzerospeed.Atpresent,the theoryaboutthepassiveanti rollingtankisfairlyma tur…     

The quickly switching routing algorithm based on multi-path in mobile Ad Hoc networks

1Introduction Thenavyandcommerceareallconcentratingtheiref fortstoresearchformobileAdHocnetworks,including itsstructure,networktopology,protocols.Modernma rinejustdependsonresearchingonwirelessmobileAd Hocnetworkstokeeptechnicallyadvanced.Commer cialappli…     

桩-土接触面剪切性质室内单剪试验研究

土与混凝土桩的接触面力学行为随土的含水量变化.进行了17%、2O%、24%共3组含水量的土与混凝土桩接触面室内单剪试验,每组试验考虑5个法向应力.试验结果表明,在含水量一定时,接触面强度破坏仍遵循摩尔一库仑破坏准则;接触面的抗剪强度、摩擦角随含水量的增大非线性单调减小,粘聚力则先增大后减小.随着含水量和法向应力的增大,接触面的破坏位置逐渐由几何接触界面向土体内部过渡.法向应力较小时,含水量对接触面应力应变曲线的初始段影响不大.试验结果可供相关工程数值分析参考.     

重庆长江鹅公岩大桥荷载试验分析

本对重庆长江鹅公岩大桥（三跨连续钢筋梁悬索桥）的荷载试验方案选定、计算预期测试结果、实测结果与计算比较作了分析。对三跨悬索桥的计算分析作简单总结，并对钢筋梁悬索桥的计算误差作初步分析。     

货运周转量、运输价格与国民经济的动态关系

在对货运周转量、运输价格与国民经济的分析基础上,选取我国1978～2006年的实际数据,对三变量之间的动态关系进行了协整分析,建立了误差修正模型,寻求三者之间的短期动态波动和长期均衡关系,且通过Granger因果关系检验三者的因果性。结果表明:货运周转量、GDP和运输价格之间存在唯一的协整关系。货运周转量是GDP和运输价格的Granger原因,GDP是运输价格的Granger原因。     

The Current Status and Some Problems of Slurry Shield in China（中国泥水盾构使用现状及若干问题）

For recent ten years, the slurry shield tunnelling technology has been widely used in major underneath river/ocean tunnels and urban metro constructions in China. With the gradual maturity of the slurry shield technology, especially the large diameter slurry shield technology, the numbers of projects and shield machines have been among the highest in the world. However, great challenges arise during the construction of the slurry shield projects under complex geological conditions, such as the stability of the excavation face, cutting tool abrasion, opening the chamber and repairing the machine, slurry circulation with slag, and remanufacturing of the shield. Therefore, it is necessary to investigate the development of slurry shield construction technology in China. Based on typical cases of slurry shield projects, this study analysed the main problems of the slurry shield in the construction process and summarised the current experiences and key technologies. Considering the actual situation of the slurry shield technology, this study clarifies its development direction in China, which is significant to promote the development of the slurry shield technology in the world.     

岩体裂隙开度变化对浆液扩散规律的影响分析

研究岩体裂隙开度变化对浆液扩散规律的影响。将单一裂隙形状简化为椭圆形和矩形,利用广义柱面坐标、牛顿内摩擦定律、达西定律、渗流微分方程、纳维—斯托克斯(Navier-Stokes)方程和边界条件下的连续性方程,推导牛顿液体在两种裂隙形状中渗透注浆的参数关系,对比研究了裂隙开度不变和变化两种情况下浆液的扩散规律。结果表明,开度变化对扩散距离有较大影响。因此,在进行注浆理论研究中,应该建立反映开度变化的裂隙模型,并研究裂隙开度变化对渗透注浆的影响规律。     

Prospect of Infrastructure Construction under "Belt and Road" Initiative（“一带一路”的基础设施建设前景）

The process of how the "Belt and Road" Initiative was brought up is studied and the major opportunities that the "Belt and Road" Intiative brings to China are described in this paper. The "Belt and Road" Intiative is very prospective. The important role of the infrastructure construction in the "Belt and Road" Intiative is shown. Two examples of the infrastructure construction under the "Belt and Road" strategy, i.e., China Nepal India Trans Himalaya Corridor and Kra Isthmus Canal in Thailand, are introduced. Finally, the challenges that China will face in the infrastructure construction under the "Belt and Road" Intiative and the rational countermeasures are described.     

地方铁路建设应为地方经济发展贡献力量

2006年全国地方铁路工作会议，确定了地方铁路”十一五”发展的总体思路和奋斗目标：完成新线铺轨1000公里．完成技改项目500公里：到“十一五“末全国地方铁路运输年货运量达到2亿吨，货物周转量达到120亿吨公里。     

提高旅客列车速度适应铁路两个转变

从实现两个根本性转为的高度阐述了铁路提高到列车速度的意义，作用和前景，还从落实“九五”提速规划的角度了提出了几点指导性意见。