典型交叉区域GSM-R无线覆盖方案设计

对交叉区域按两线交叉相对位置关系、线路的列控等级、基站设置位置与交叉点位置关系、有无联络线等因素进行了详细分类,并针对每种类型给出了具体的无线覆盖方案建议;然后选取了郑徐客专与京九线交越区域和商合杭铁路引入芜湖站二个典型案例,将交叉区域无线覆盖方案设计建议进行了示范应用;最后总结了交越区域GSM-R系统的设计原则,其他铁路交叉区域的GSM-R系统方案设计可直接参考。     

大鼠前牙扭转移动后保持期动物模型的建立

目的 建立大鼠实验性正畸前牙扭转移动后保持期的动物模型并分析保持时间与复发距离的关系.方法 采用36只雌性SD大鼠,在上颌两个中切牙间施加20 g的力量,建立牙根扭转的动物模型.10d后进行固定保持,分为1、4、7、14、21d保持组(实验组),并设不予保持的对照组.测量加力结束后、保持结束时和拆除保持器后7d两中切牙...     

基于小波去噪的车牌定位系统

如何避免外界环境的变换对车牌定位的影响是一个有待研究的问题,介绍基于小波去噪的车牌定位系统及其在车牌定位流程中采用小波去噪法去除外界噪声对车牌定位影响的方法,通过边缘加强、中值滤波,最后通过垂直投影和水平投影对车牌精确位置进行检测,取得了较好的定位效果.     

埋深和盾构推力对盾构隧道的地表变形影响分析

引入等代层概念,对不同埋深、不同盾构推力对地表沉降的影响进行了研究,详细介绍了应用ANSYS进行盾构法隧道地表沉降计算的建模方法和相关技巧,并将计算结果与类似工点的实测数据进行了比较分析。     

激光焊接技术在舰船建造中的应用

介绍了激光焊接技术的发展历史、工业焊接用激光源的基本特点、激光焊接技术用于造船业的优势及其存在的困难,重点介绍了激光焊接技术在舰船建造中的应用实例,包括激光焊接大型船板、激光焊接型材、焊接瓦棱夹层板、激光焊接修复等,指出了在舰船建造中开展激光焊接技术研究的必要性。     

Small city waterfront restoration

Abstract

Redesign and reuse of waterfronts are a common experience today. Small cities presented with a deteriorating waterfront are faced with formidable economic and institutional impediments to their efforts to reverse the decline. This paper presents some design principles that if followed provide a framework for developing restoration plans. It also describes the efforts of the California State Coastal Conservancy to apply these principles to assist three small cities along California's coast to revitalize their waterfronts. Their experience indicates that in an era of limited budgets waterfront redevelopment can occur with substantial economic benefit where limited funds are applied to often small but crucial elements that result in creating waterside amenities.     

基于车牌识别的城市年票自动管理系统

年票制是提高公路通行效率的行之有效的办法,但由于年票征管部门监管不力,导致车辆恶意逃费所致的通行费流失严重,针对我国城市年票监管实际情况,提出一种基于车牌识别的城市年票自动管理系统.首先介绍了该系统的架构以及年票收费站管理和委托站次票监管两个子系统的工作原理,接着重点论述实现该系统的三项关键技术：车牌识别技术、数据同步技术、IC卡防伪技术.该系统已在广东省中山市投入使用,运行稳定可靠,受到客户的好评.     

The status of coastal zone management in South Africa

Abstract

In this article, an overview of the status of coastal zone management (CZM) in South Africa is presented. Firstly, it provides background to the development of various initiatives to promote sustainable use of coastal resources within the context of sociopolitical changes in South Africa. Thereafter, it examines the progress made with respect to key attributes underpinning most CZM programs. Finally, it identifies obstacles to achieving effective CZM in South Africa and makes recommendations to address these shortcomings. The review reveals that whilst considerable progress has been made in certain areas of program development, such as resource conservation and pollution control, there are several gaps and inadequacies within existing efforts. These include the absence of a clear policy to guide efforts, lack of coordination amongst government departments involved in CZM, as well as inadequacies in our legal and administrative system. The promulgation of a Coastal Zone Management Act and the establishment of a Coastal Unit charged with the coordination and review of all activities impinging on coastal resources are amongst the recommendations made.     

基于齿廓法线的非圆齿轮齿廓数值算法

基于齿廓法线法,提出一种简单的非圆齿轮齿廓的数值算法,将非圆齿轮齿廓的计算转化为求啮合瞬心的问题.基于插齿刀的几何模型,有效地解决了对于内凹节曲线齿轮齿廓的求解,当非圆齿轮的齿廓为圆弧,正弦等曲线时,此方法一样简洁有效.     

淹没齿型丁坝阻力与壅水响应关系试验研究

为研究淹没齿型丁坝阻力与其壅水响应关系,利用物理水槽试验与理论分析相结合的方法,建立了淹没齿型丁坝阻力系数计算方法,其阻力系数大小主要与无量纲淹没度与相对坝长相关。进而采用动量守恒的方法构建了阻力系数与壅水效应相关联的淹没齿型丁坝壅水预测模型。通过实测数据对壅水预测模型进行验证,计算结果与水槽试验数据符合良好。研究成果可为其他形式丁坝或相关涉及建筑物阻力与壅水效应研究提供参考与借鉴。