安庆长江公路大桥钢围堰封底技术

对安庆长江公路大桥钢围堰封底的施工工艺、施工流程、施工准备、组织准备及封底结果等情况进行了介绍；对大型钢围堰封底施工提出了一些见解。     

Particle Filter and Its Application in the Integrated Train Speed Measurement

Particle filter(PF) can solve the problem of state estimation under strong non-linear non-Gaussian noise condition with respect to traditional Kalman filter(KF) and those improved KFs such as extended KF(EKF) and unscented KF(UKF). However, problems such as particle depletion and particle degradation affect the performance of PF. Optimizing the particle set to high likelihood region with intelligent optimization algorithm results in a more reasonable distribution of the sampling particles and more accurate state estimation. In this paper, a novel bird swarm algorithm based PF(BSAPF) is presented. Firstly, different behavior models are established by emulating the predation, flight, vigilance and follower behavior of the birds. Then, the observation information is introduced into the optimization process of the proposal distribution with the design of fitness function. In order to prevent particles from getting premature(being stuck into local optimum) and increase the diversity of particles, Lévy flight is designed to increase the randomness of particle's movement. Finally,the proposed algorithm is applied to estimate the speed of the train under the condition that the measurement noise of the wheel sensor is non-Gaussian distribution. Simulation study and experimental results both show that BSAPF is more accurate and has more effective particle number as compared with PF and UKF, demonstrating the promising performance of the method.     

群桩工后沉降计算探讨

针对垂直荷载作用下的桥梁群桩基础提出了一种计算工后沉降的方法。该方法在一维固结理论的基础上 ,结合加载实际情况对固结公式重新进行推导 ,计算出群桩在任意时刻的固结度 ,从而达到预测沉降的目的。理论结果与目前的实测数据相比较 ,总体上相吻合。     

一例奇怪的汽车异响故障

一辆1993年款本田雅阁CB3轿车，配备F20A3发动机及手动变速器。该车在起步行驶过程中，发动机附近发出“吱吱”的响声。     

巴基斯坦卡拉奇港OP—Ⅱ旧码头基础桩拔除技术

通过不同地质条件下的基础桩拔除对比分析，总结了震动和射水对基础桩拔除的减阻作用，提出了震动减阻拔桩的选锤经验参数。     

高校办学理念应体现核心利益相关者的利益认同性

高校是一种典型的利益相关者组织,师生员工是学校的核心利益相关者。高校应通过树立科学发展、以人为本、和谐共生的办学理念,充分体现核心利益相关者的利益认同性,从而团结和依靠广大核心利益相关者,促进学校事业的全面、协调、可持续发展,促进师生员工的全面发展。     

应急运输保障对策探析

逻辑知识:1343,智能体:1171,相结合:1115,面向对象:1058,逻辑推理:977,平台:934,语义:887,老化程度:872,建模方法:787,属性:772,构建知识:760,服务:735,公路:734,实例:707[1] http://hpsg.stanford.edu/hpsg. [2] Kay M.Parsing in Function Unification Grammar[M]//Dowty,     

勘测数据自动采集及子系统接口技术的开发与应用

勘测数据自动采集及计算机处理是实现勘测技术一体化，智能化的基本。本文通过铁道部科技司《勘测数据自动采集与子系统接口技术》项目在我院组织开发与应用实践，表明开展勘测设计一体化的必要性。     

三例怠速不稳故障的排除

故现障象：一辆桑塔纳2000GSi型轿车，发动机怠速抖动，打开空调后抖动加剧，行驶中加速时有明显的“闯车”现象，且发动机熄火后难以起动。