动荷载作用下沥青路面寿命预估

基于4自由度的1/2车辆振动模型,以路面不平整度为激励,运用系统动力学和车辆振动理论分析了不平整路面上的行车动荷载;采用修正Shell永久变形理论,考虑荷载和环境的综合作用,计算了动荷载作用下路面产生的永久变形和平整度的衰变规律;并结合某高速公路路面平整度检测结果,参照质量规范得出路面的剩余使用寿命,建立了动荷载作用下的沥青路面剩余寿命计算与预估的方法。研究结果表明,应用该法不但能够较为准确地预测沥青混凝土路面的剩余使用寿命,还能为准确评价道面使用品质和制定费用-效益最佳路面养护方案提供依据。     

浅谈特殊路基施工关键技术

针对特殊路基施工中存在的各方面的问题在调查分析的基础上做了大量的研究,提出合理的解决方案,并对特殊路基施工中存在的问题加以总结。     

路基典型的横断面形式

路基横断面形式应与沿线自然环境相协调,避免因深挖、高填对其造成不良影响。根据公路等级、技术标准,结合当地地形、地质、水文、填挖等情况选用。高速公路、一级公路宜采用浅挖、低填、缓边坡的路基断面形式。由于填挖情况的不同,路基横断面的典型形式可以归纳为路堤、路堑和填挖结合三种类型。     

水上钢支架设计和施工

以实际桥梁修复工程为例,基于钢支架的受力特点,有关主梁荷载向横桥向分配梁、贝雷梁、工字钢垫梁及钢管桩等的传递特点分析表明,该钢支架设计方案是成功的,可为类似工程提供借鉴。     

基于影响矩阵的桥梁合理设计状态的确定

在分析基于线性、非线性调值计算的影响矩阵法的基础上,深入剖析影响矩阵法在斜拉桥、系杆拱桥、自锚式悬索桥及预应力混凝土梁式桥合理成桥状态确定中的应用,提出一些较具实用价值的计算方法,可为桥梁设计提供有益的参考。     

桥梁伸缩装置安装施工质量控制

结合河南省某高速公路桥梁伸缩缝的施工实例,介绍伸缩缝的施工工艺及质量控制要点,总结施工注意事项,可供同行参考。     

高弹性改性沥青SMA-10配合比设计及应用

采用SK高弹性改性沥青进行室内SMA-10配合比设计,并铺筑试验路,试验结果表明：高弹性改性沥青SMA-10的水稳定性优良,其高温抗车辙性能尤其突出,动稳定度高达11052次/mm。经试验路现场测试,证明SMA-10的构造深度、摩擦系数及渗水系数完全满足规范要求。     

基于界壳理论的交通环境系统运行机理初探

从界定交通环境系统的界壳论域出发,分析交通环境系统的界壳支撑结构和界壳行为,定义界壳开放度、界壁抵抗力以及界门开关速度、界门交换率等描述交通环境系统界壳功能的参数。研究表明,界壳论在降低路网建设对交通环境系统破环程度、调控交通污染排放与环境自净化能力的协调运行等方面具有较好的应用前景。     

Eye and Iris Detection Using Projection and Radial Symmetry Transform

This paper presents an eye and iris detection algorithm for human facial images. The authors combine three features of the eye to develop the algorithm: 1) the pixels surrounding the eyes are more variable than other parts of the face; 2) eye pixels are darker than their neighbors; 3) eyes often exhibit radial symmetric properties. Through the first feature, two rough regions of both eyes are detected on the face. Eye masks are then formed based on the second feature, and a fast radial symmetry transform is applied to the two rough regions of both eyes. Finally, accurate iris centers are located by searching the maximum value of the radial symmetry transform results. Using 450 human facial images from the Caltech face database, experiments show that the success rate of the proposed method is 91.7%. The effectiveness of the method was also verified through detection of video frames.     

Design of DC Partial Discharge Detecting System for Electrical Equipment

A balancing method was used to build a DC partial discharge (PD) testing circuit for electrical equipment, and a narrow-band detection system was designed using detection resistance and a filter. After signal accessed a high-speed digital acquisition (DAQ) card, the system was triggered to extract a single partial discharge (PD) signal. To eliminate the interference pulses caused by power supply ripple, etc., the time domain and frequency domain features of pulses were extracted. Based on the features, cluster analysis was used to exclude interference pulses. Two-dimensional and three-dimensional histograms were obtained by use of the Δt method. Then, 22 discharge statistical operators were calculated for the two-dimensional charts. Lastly, the defective system is capable of PD detection in electrical equipment.