水泥混凝土路面病害的预防及处理措施

随着我国公路建设的快速发展,水泥混凝土路面的铺筑越来越广泛。目前,我国各省市二级公路大部分采用水泥混凝土刚性路面,在部分省市如广西、广东,水泥混凝土刚性路面还广泛运用于高速公路。因此,水泥砼路面的质量对投资和运营至关重要。     

On the use of mathematical programming in the evaluation of transport policies

This paper focuses on the evaluation processes by which decisions regarding transportation alternatives can be assisted. A multidimensional approach usually called multiple criteria decision making is required to represent the complexity of transportation policy and systems.

The multiple criteria decision making techniques can be divided into two groups. The first is based on a ranking scheme approach and the second on a mathematical programming approach.

A multiple objective mathematical programming procedure known as Goal Programming is presented. The authors examined the use of that procedure in real transportation problems.

The results suggest that multiple objective mathematical programming techniques in general do not appear to be appropriate in transportation policy analysis involving mutually exclusive alternatives. Their use can be limited to special cases in the private sector.     

水泥混凝土路面破碎板处理技术浅析

以SL沿海高速抚宁连接线为例,分析病害形式和产生原因,以及在破碎板处理中出现的质量问题,提出解决问题的最佳方法.     

浅论行动导向教学的过程性评价——以《商务英语交际》课程为例

行动导向教学倡导通过行动来学习和为了行动而学习,即"做中学"。传统的终结性评价已经不能适应行动导向教学法的需求,过程性评价应运而生。过程性评价采取目标与过程并重的价值取向,对学习的效果和过程进行全面的评价,对学生的学习质量水平做出判断,肯定成绩,找出问题,促进学生对学习的过程进行积极的反思,从而更好地把握学习方式方法。     

膨胀土分析及相关路基处治方法

膨胀土在我国分布比较广泛,其对于工程的危害远高于其他病害地质,并且对于膨胀土的识别和评定目前并无统一的标准,在设计治理与施工方面缺乏成熟的经验,因此主要的处置方法就是化学改性法。     

公路石料的勘探、选址与加工的技术探讨

为了适应目前高速公路的快速发展,特针对公路石料的勘探、选址与加工的技术进行分析研究,为工程可行性研究阶段、初步设计阶段、施工阶段以及养护阶段料场的选择提供参考。     

Estimates of vertical mixing during a Lagrangian experiment off the Galician coast

An adjoint 1-D model was used to determine vertical diffusivity coefficients from temperature profiles collected within a filament escaping from the Galician coast following an upwelling event. The optimisation scheme ended with relatively high diffusivity values within the thermocline (9×10⁻⁵ m² s⁻¹). Such high values are relevant for biogeochemical exchanges between surface and deep waters in stratified areas.The optimised values were several orders of magnitude higher than the bulk of diffusivity measurements recorded with a free-falling device; however, the optimisation solution was consistent with the arithmetic mean of the measurements in the thermocline (7.7×10⁻⁵ m² s⁻¹), giving more weight to the few largest values. Below the thermocline, the data assimilation method failed because of the three-dimensional nature of the advective field of the upwelling system. Ignoring this advective forcing in the model led to estimates that were two orders of magnitude too high.The results suggest that turbulent mixing is a random process where a few intense events determine the average mixing that drives the long-term evolution of the water column structure. This statistical property is very important when one wants to use instantaneous diffusivity measurements for modelling purposes.     

基于视频的道路交通事件自动检测技术

结合当前道路交通事件自动检测的实践经验和国内外相关技术进展,讨论了交通事件检测的类型、目的和各种检测技术,重点介绍了基于视频的道路交通事件自动检测所采用的图像处理算法和基于视频的道路交通事件自动检测算法。     

面向交通安全的车辆间距测试技术研究

基于数字图像处理理论,提出了一种车间距离测试的方法,介绍了边缘增强与形态学处理相结合的图像预处理算法、阈值分割与判定树结合的障碍物检测方法以及反转透视测距计算模型,利用VC 平台编写了测距实验程序并组织了测距试验.试验结果表明,该测距方法简洁有效,能满足智能车辆测距工程需要,是一种可行的前方车辆距离测量方法.     

基于驾驶员信息处理能力的高速公路作业区限速值计算方法

基于人体工程学原理,将驾驶员在高速公路作业区行驶过程中接触的交通信息分为道路几何信息、道路交通运行信息、交通管理控制信息、气候与环境信息及驾驶员自身信息,将作业区各种道路交通信息进行量化处理,在系统分析驾驶员对信息处理模式的基础上,提出了基于驾驶员信息处理能力的高速公路作业区车速速度限制值计算模型。以2006年5月哈大公路入口作业区为例,考虑车道宽度、开放车道数、隔离设施、合流机会、合流冲突及大车影响对驾驶员接受信息的量化影响,计算得出该作业区的限速值为50 km/h,与工程实际中采用的55 km/h吻合较好,验证了本文所提方法的有效性,为高速公路交通管理部门确定车辆速度限制标准提供了一种参考方法。