杭甬高速公路桥头跳车的处理

杭甬高速公路是浙江省内的第一条高速公路，建成5年多来，由于工后沉降的影响，引起严重的桥头跳车。本文从分析桥头跳车的成因出发，提出一些处理方法，以达到保证杭甬高速公路的正常使用及减少养护费用的目的。     

浅谈紫外成像仪检测技术在铁路电气化领域的应用

电气化铁路已经成为世界铁路运输业朝着“高速、重载”发展道路上的主流，发展日新月异．法国、日本、德国、美国等国家已成为电气化铁路为主的铁路运输业。电气化铁路主要优势在于能耗低、运能大、功率大、运输成本低、污染少、粉尘与噪声小等诸多优势。同时也存在问题，最大的问题就是电力供应系统发生大面积停电而造成铁路网络的瘫痪。     

浅谈东京地铁的建设理念

着重介绍了东京地铁建设过程中严谨的规划设计、先进的施工技术、现代化的运营管理系统、完备的防灾减灾措施以及注重细节的人性化设计,对我国城市轨道交通建设提供参考与借鉴.     

A study on dynamic response of cable-seabed interaction

A numerical method is developed to investigate the dynamic response of cable-seabed interaction in this paper. The motion of cable is described by the Lumped Parameter Method, while the seabed, unlike the prevailing simplified model of elastic foundation, is modeled as an irregular continuous rigid surface with rebound and friction existing, and the forces exerted by the seabed consist of normal counterforce and isotropic tangential Coulomb friction resistance. To describe the detailed dynamic response, two coefficients are introduced by analogy with the theory of rigid body collision with friction. The cable-seabed kinematic and dynamic contact conditions are formulated subsequently, and are used to incorporate the seabed effect into the cable dynamics to produce a set of ordinary differential governing equations. In this paper, we employ 4th order Runge-Kutta method to solve these equations. Several simulation cases are presented to illustrate the seabed effect. The results show that friction and impact have a prominent influence on the statics and dynamics of the cable.     

Regularization method and immune genetic algorithm for inverse problems of ship maneuvering

Ship maneuverability, in the field of ship engineering, is often predicted by maneuvering motion group MMG) mathematical model. Then it is necessary to determine hydrodynamic coefficients and interaction force coefficients of the model. Based on the data of free running model test, the problem for obtaining these coefficients is called inverse one. For the inverse problem, ill-oposedness is inherent, nonlinearity and great computation happen,and the computation is also insensitive, unstable and time-consuming. In the paper, a regnlarization method is introduced to solve ill-posed problem and genetic algorithm is used for nonlinear motion of ship maneuvering. In addition, the immunity is applied to solve the prematurity, to promote the global searching ability and to increase the converging speed. The combination of regnlarization method and immune genetic algorithm(RIGA) applied in MMG mathematical model, showed rapid converging speed and good stability.     

A study of maneuvering control for an air cushion vehicle based on back propagation neural network

A back propagation (BP) neural network mathematical model was established to investigate the maneuvering control of an air cushion vehicle (ACV). The calculation was based on four-freedom-degree model experiments of hydrodynamics and aerodynamics. It is necessary for the ACV to control the velocity and the yaw rate as well as the velocity angle at the same time. The yaw rate and the velocity angle must be controlled correspondingly because of the whipping, which is a special characteristic for the ACV. The calculation results show that it is an efficient way for the ACV's maneuvering control by using a BP neural network to adjust PID parameters online.     

基于MMS的移动抄牌系统

利用多媒体信息服务技术(MMS),开发了一套架构成本低、具有劝告教育功能、保证处罚告知到达率的移动抄牌系统。通过试用,该系统能对违法停车行为区别处理、彩信告知到达率高、实时性好、减轻了交巡警内业整理的工作量,具有良好的推广前景。     

Preparation and characterization of a new kind of nano-rod shaped polycarboxylate slump-retaining admixture using for concrete

A new kind of nano-rod shaped polycarboxylic acid slump-retaining agent was synthesized. Transmission electron microscope (TEM) experiment showed that the nano-rod was bound together as macromolecular aggregates in solution. Application performance studying suggested that this kind nano-sized polymer material had excellently plasticity-retaining performance in cement-based materials and could improve endurance performance of hardened cement-based materials distinctly. The concrete with an initial slump of 2?C9 cm could achieve 3 h plasticity-retaining performance with the help of this kind nano-rod. The product had extremely wide application value in the market.     

辽宁省滨海公路抛石路基压实及检测方法研究

简要介绍了辽宁省滨海公路抛石路基的压实工艺,并在此基础上介绍了三种检测抛石路基压实效果的方法.     

起亚车D挡工作有时失效

故障现象一辆装备V6 2.7 L发动机的2001款进口起亚嘉华轿车,采用F4A51型自动变速器,出现当自动变速器位于D挡时间歇性不工作,并且出现故障时仪表盘上的