PE复合改性沥青技术研究

依据"相似相容"和"空间位阻"原理,以显微图像分析、流变力学和常规试验为手段,对添加了不同化学助剂的几种PE复合改性沥青的技术性能、加工工艺及影响因素进行了系统研究。结果表明:PE复合改性沥青不仅具有优良的性能,而且在热贮存过程中不发生离析,达到Ⅲ-B、Ⅲ-C级行业技术标准,提出的工艺条件参数可以作为工业化生产技术的基础。     

Self-dual Codes Defined on Factor Graphs

A definition of a self-dual code on graph and a procedure based on factor graphs to judge a self-dual code were presented. Three contributions of this paper were described as follows. To begin with, transform T_ R→L were defined, which was the basis of self-dual codes defined on graphs and played a key role in the paper. The second were that a self-dual code could be defined on factor graph, which was much different from conventional algebraic method. The third was that a factor graph approach to judge a self-dual code was illustrated, which took advantage of duality properties of factor graphs and our proposed transform T_ R→L to offer a convenient and geometrically intuitive process to judge a self-dual code.     

浅议汽修从业人员素质的提高

对我国汽车维修行业和从业人员现状进行了分析,并提出了提高从业人员素质的建议。     

桥梁施工过程分析在ANSYS中的实现方法

以朝天门大桥为实例,介绍了如何使用ANSYS有限元软件对该桥进行建模,同时提出了在ANSYS中模拟施工过程的几种方法:一次成桥、生死单元、叠加,最后对这几种模拟方法进行了分析比较.     

上海市城市快速道路交通流特性分析

基于等效通行能力的概念,文章重新定义了空间区域的流量、密度、速度的概念,并给出计算公式.利用已采集的快速道路交通流信息,合理确定时间段和快速路段,并运用空间区域交通流基本参数分析了快速道路交通流特性,并得出各快速道路路段的交通运行状态,和交通流3参数基本模型.     

无损检测技术在道桥工程中的应用与发展

介绍了无损检测技术在道桥工程中的应用情况,分析了无损检测技术在道桥工程应用中所存在的困难与问题,从中提出一些解决的思路以及预测道桥无损检测技术今后的发展趋势。     

The Tip Leakage Flow Structure of an Axial Fan with Tip Clearance

Experiment and numerical simulation technique are used to investigate the tip leakage flow in an axial fan with tip clearance at the design condition. The flow field in the tip region of fan is measured using a PDA (Particle Dynamics Analysis) system. The flow is surveyed across the whole passage at fifteen axial locations (from the 100% axial chord in front of the leading edge to the 100% axial chord behind the trailing edge), mainly focusing on the outer 90% blade span. Both experiment measurement and numerical simulation indicates the leakage flow orig-inated from the tip clearance along the chord rolls-up into three-dimensional spiral structure to form leakage flow vortex. The interaction of leakage flow and main flow will produce the low velocity zone, and block the flow. The leakage flow almost occupies the most part of flow passage behind the trailing edge.     

沥青路面抗滑表层抗滑性能与密水性的研究

通过大量室内试验研究了沥青混凝土矿料级配、沥青用量等因素对其体积性能(空隙率)和表面特性(构造深度)的影响。通过研究,分析了沥青混凝土的抗滑性能与密水性之间的关系,并找出了级配组成中对混合料性质的主要影响因素,试图寻求最佳的级配形式,以指导实际沥青路面工程的材料设计。     

桥梁冬季预制梁板的方法和注意事项

在北方寒冷地区冬季进行梁板预制，可利用暖棚通气加热法施工。施工时主要控制温度条件：(1)混凝土的拌和温度；(2)混凝土浇筑温度；(3)混凝土养护温度。     

寒冷地区改性沥青路面施工技术

简要说明改性沥青的配合比设计以及改性沥青混凝土路面施工工艺,检验改性沥青混合料路用性能。