新《公路工程基本建设项目概算预算编制办法》（JTGB06—2007）有关问题的探讨

本文主要介绍交通部新的《公路工程基本建设项目概算预算编制办法》（JTGB06—2007）中建设期贷款利息的计算方式、新老编制办法计算利息的差别及注意事项以及对差价预备费的探讨。     

基于流媒体交互式教学系统的研究

网络教学已逐步深入现代教学过程中,并发挥着重大的作用。但是传统的视/音频教育缺乏交互性等缺点,不能完全满足现代教育的需要。本文以流媒体技术为基础,提出一种解决方案,实现视频技术在教育中的应用。     

濠江一桥下承式钢箱系杆拱桥上吊点局部受力分析

文中采用大型通用有限元软件ANSYS对濠江一桥两种典型上吊点锚固结构进行局部计算分析,了解不同形式的吊杆锚固结构的受力机理以及特性,发现当内横隔板与拱肋顶部未连接形成一个整体的情况下,拱顶横隔板应力虽出现突变但是满足要求。为该类桥梁拱肋空间受限时,横隔板设置形式提供一个新思路。     

步履式顶推钢箱梁垫块性能对比分析

步履式顶推施工中,顶推设备与主梁支承接触区域局部应力变化复杂,研究合理的垫块参数可以控制施工质量并保证结构安全.以南京龙翔西立交建设工程为背景,采用midas Civil有限元软件建立梁单元分析模型,以钢箱梁悬臂端挠度和顶推墩支反力确定典型不利工况,基于通用有限元软件ABAQUS建立典型不利工况下“壳-实体-接触”混合...     

Numerical Study on Groundwater Drawdown and Deformation Responses of Multi-Layer Strata to Pumping in a Confined Aquifer

Pumping artesian water from porous media inevitably reduces the groundwater head and promotes soil consolidation,which may result in regional land subsidence.In this study,a fluid-mechanical coupled numerical model is developed to investigate the dewatering-induced groundwater drawdown and deformation responses for multi-layer strata.The relation between the stratum deformation and groundwater drawdown is discussed.The results show that the pumping process can be divided into four stages.The development of vertical deformation is inconsistent with the change of the pore pressure for the strata except for the confined aquifer at the early stage of pumping.The strata expand while the pore pressures reduce.This inconsistency may be due to the large unloading in the confined aquifer at the early stage of pumping.Soil arch comes into being owing to the constraint of the surrounding soils when the large unloading occurs in the confined aquifer; this can reduce the stratum compression and cause the expansion of the layers.It can be concluded that as the pumping continues,the decrease of the pore pressure dominates the vertical deformation and results in the soil compression in all strata.     

斯特林发动机－未来的AIP系统

考库姆公司的斯特林AIP系统是目前最成熟的不依赖空气的推进系统，正运行在几型潜艇上。对斯特林发动机系统的研究使得其性能优于其他AIP系统，并且作为瑞典国防装备局的一个长期项目，其发展将满足下一代潜艇的需求目标。考库姆公司在生产Mk2型发动机的同时，开始投资研制用于下一代潜艇的Mk3型发动机，有可能将斯特林AIP系统作为主动力源。Mk3型发动机以Mk2型发动机为基础，但在功率和效率两个方面有所改善，Mk3型发动机计划于2003年开始生产。论述斯特林AIP潜艇的运行经验。包括斯特林AIP系统的设计详细情况，介绍Mk3型发动机研制的计划，工作和结果。     

FSA在船舶安全管理中的实践

本文通过剖析综合安全评估(FSA)的技术特征,以及在国际及我国海事机构的运用情况,进一步阐述应用综合评价方法的具体措施,并对该方法在船舶管理实际应用中存在的问题进行了分析,提出相应对策。     

钢砂磨料在修船涂装施工中应用的可行性

喷砂除锈是当今世界上修船用得最为普遍的船舶钢板表面清理工艺，目前使用较多的磨料是钢质磨料。从施工工艺流程调整、设备装备改进、节能降耗和污染控制等方面探讨在修船涂装施工中采用钢砂磨料替代铜炉渣磨料的可行性。     

故障 排除 经验 点滴

一辆1999年出厂的上海大众桑塔纳时代超人轿车，累计行驶22万km，出现电动车窗无规律断电，断电后电动车窗开关上的指示灯熄灭，4个门电动车窗同时不工作的现象。     

Steady state analysis of towed marine cables

Efficient numerical schemes were presented for the steady state solutions of towed marine cables. For most of towed systems, the steady state problem can be resolved into two-point boundary-value problem, or initial value problem in some special cases where the initial values are available directly. A new technique was proposed and attempted to solve the two-point boundary-value problem rather than the conventional shooting method due to its algorithm complexity and low efficiency. First, the boundary conditions are transformed into a set of nonlinear governing equations about the initial values, then bisection method is employed to solve these nonlinear equations with the aid of 4th order Runge-Kutta method. In common sense, non-uniform (sheared) current is assumed, which varies in magnitude and direction with depth. The schemes are validated through the DE Zoysa's example, then several numerical examples are also presented to illustrate the numerical schemes.