客车整车入库检验流程分析

整车入库终检是客车行业目前普遍采用的质量控制手段。本文就整车入库终检存在的问题进行分析，对整车入库终检流程进行改进，取得了良好的效果。     

饱和强盐渍土地区地基处理技术的应用研究

以青海察尔汗盐湖某高速公路地基处理为例，介绍了盐渍土地区地基处理技术以及适用条件；针对饱和盐渍土地基，提出了粒料桩处理技术；针对现场粒料桩施工出现的问题，进行了大量不同工艺的试桩，最终确定了饱和盐渍土地区粒料桩的施工工艺及注意事项。对试桩进行了检验，结果表明：新工艺施工的粒料桩，桩身长度达到了设计要求、桩体密实度、单桩承载力和复合地基承载力得到了很大的提高，满足了工程需要，解决了技术难题。     

钢筋混凝土结构可靠性模糊综合评估

根据钢筋混凝土结构的可分性，将钢筋混凝土结构分为梁、板、柱、地基基础、围护系统和结构整体性6个相对独立的部分。结合专家经验和已有研究成果，按照各自的准则和指标，构造各项目隶属函数来描述其可靠性的分级，建立各项目模糊关系矩阵。根据层次分析法原理，确定影响其可靠性的各因素权重，提出了钢筋混凝土结构可靠性模糊综合评估新方法。该评估使已有建筑物可靠性鉴定工作更加合理，并为建立相应的专家系统奠定了基础。     

昆山市震川西路水泥混凝土路面改建设计关键技术

随着交通量的增加和路面状况的恶化，大量的水泥混凝土路面都面临着翻修改建的任务，加铺沥青混凝土罩面是其中最常用的方法之一。为确定经济合理的加铺结构层，保证路面结构强度，延长道路使用寿命，防治反射裂缝是其关键技术。通过介绍震川西路改建的设计及施工方案，为类似工程提供参考。     

Time domain modeling and simulation of warship flooding process based on counter-flooding activities北大核心CSCD

[目的]实战损伤条件下,舰艇进水是舱室进水漫延与舰员抗沉行为相对抗的过程。现有的不沉性理论无法客观、全面评估抗沉干预对战损舰艇进水过程的影响,缺少从全时域的角度对战损舰艇进水过程开展预测的手段。[方法]首先,分析抗沉干预下舰艇破损进水的耦合关系,构建进水过程时域模型,进而给出数值求解算法;其次,结合案例分析抗沉干预要素对不沉性的影响,并开发可视化、交互式的仿真系统。[结果]通过仿真系统实现了进水过程与多种抗沉干预方式的综合评估,是对现有不沉性理论的有效补充。[结论]该成果不仅可帮助设计人员掌握抗沉设计方案对干预进水过程的有效性,指导舰艇抗沉能力的设计;还可应用于抗沉指挥决策的态势预报,具有较高的军事应用价值。     

公路大桥上部箱梁滑移模架施工

介绍了滨州徒骇河大桥上部连续箱梁滑移模架施工,结合工程实际阐述了移动支撑系统的功能、原理、工艺流程及施工过程中控制要点。     

汽车检测与维修技术专业学生自主学习的研究与分析 ——以北京学校为例

基于工作过程以能力培养为主是北京汽修专业新的一轮教学改革目标。通过将传统教学与企业实践工作相融合,提倡行为导向,鼓励学生进行自主学习。但是在教学改革的过程中也暴露出学生自主学习能力不足,需要开展学生自主学习能力培养,需要增强学生主体地位,激发学习兴趣;需要推行探究式学习改进学习模式;需要改进教学方法加强学校软硬件建设。     

基于层次分析法的互通式立体交叉方案优化

互通式立交起着交通枢纽的作用，运用层次分析法，建立多级递阶结构模型，将复杂的决策过程层次化、数量化，解决多目标、多层次、多准则的决策问题，非常适合互通立交方案的优化。     

Spectral and time‐frequency analyses of freeway traffic flow

This paper uses spectral and time‐frequency analyses to treat three macroscopic traffic characteristics, namely, time mean speed, volume and occupancy as stochastic processes. Spectral and time‐frequency analyses are performed to characterize power spectral density (PSD), cross‐PSD, autocorrelation and cross‐correlation of these characteristics using TransGuide traffic data collected from four different freeways. It is found that low‐frequency components dominate the PSDs of speed, volume and occupancy at all times. The magnitude of PSDs decreases dramatically as frequency increases and remains almost at a constant level in high‐frequency regimes. A power law is found to exist, which describes the relationship between the frequency and the PSD of traffic characteristics. It is also found that speed can be properly modeled by a narrowband low‐pass stochastic process in a low‐frequency regime and by a nonzero mean white noise in a high‐frequency regime. Strong periodicities and synchronization are both shown in traffic flow. A variety of frequencies can be excited by congestion, and there is no dominant frequency found in stop‐and‐go traffic. Copyright © 2013 John Wiley & Sons, Ltd.     

Walking-distance introduced queueing model for pedestrian queueing system: Theoretical analysis and experimental verification

We have introduced the effect of delay in walking from the head of a queue to the service windows in the queueing model and obtain a suitable type of queueing system under various conditions by both computational simulation and theoretical analysis. When there are multiple service windows, the queueing theory indicates that mean waiting time in a fork-type queueing system (Fork), which collects pedestrians into a single queue, is smaller than that in a parallel-type queueing system (Parallel), i.e., queues for each service window. However, in our walking-distance introduced queueing model, we have examined that mean waiting time in Parallel becomes smaller when both the arrival probability of pedestrians and the effect of walking distance are large. Moreover, enhanced Forks, which shorten waiting time by reducing the effect of walking distance, are considered, and parts of our results are also verified by real queueing experiments.