悬挂式宽幅辊轴整平机桥面铺装施工监理要点

对使用悬挂式宽幅整平机进行桥面铺装的监理工作进行了阐述,对主要施工控制环节进行了分析,从施工准备阶段监理、施工阶段监理、成品抽检及主要监理控制要点等方面进行了论述,总结了监理控制要点,解决了桥面铺装平整度及干缩裂缝的质量监理难点。     

极浅水单点系泊系统的设计研究

在分析研究单点系泊系统的主要形式、特点和适用范围的基础上,选取了软刚臂单点系泊系统作为的"海洋石油113"新单点系泊系统,针对其设计中遇到的难题,进行了深入研究,归纳总结了极浅水海域单点系泊系统的设计时所重点关注的设计基础、低频波浪力、触底和上浪等关键问题,为今后极浅水单点系泊系统设计提供一点借鉴经验。     

海上水源井简易维修装置研制

针对海洋石油生产平台水源井井深通常较小的特点,分析了水源井维修通常采用的常规海洋修井机装置及较少使用的大力举升器装置,指出两种方法的不足之处;最终依据水源井实际维修需求,研制出一种实用的简易装置,使水源井的维修工作经济而高效。     

精密单点定位（PPP）原理及其在境外工程项目中的应用

GPS精密单点定位（PPP）方法采用单台双频GPS接收机进行观测并解算获得毫米级高精度的基于ITRF框架的测站坐标,因其数据采集及数据处理方便、简单且费用低,极具实用性。简述PPP的基本原理及其精度分析,并结合近几年在境外的工程案例, 探讨该技术在类似项目中应用的可行性。     

Internalization of Transportation External Costs: Impact Analysis of Logistics Company Mode and Route Choices

Abstract

This study focuses on the mode and route choices of a logistics company in a situation involving intercity transportation with networks of surface roads, highways and a railway. A method of transportation network analysis is applied to construct a logistics company mode and route choice models with the objective of minimizing total distribution and external costs. This study also assumes that the fleet number and vehicle capacities are given. Freight distributed from a distribution center to given retailers or consumers via surface road/highway links or via intermodal transportation involving surface road/highway links and a railway. In terms of model construction, this study first explores the routing and sequence of the retailers and consumers served by each vehicle. Second, the study internalizes the external cost of air pollution into the total distribution cost, to analyze the influences of external cost burdens on a logistics company mode and route choices from a user charge perspective. Finally, the study designs a heuristic algorithm for solving the above models, and illuminates the modeling process using a numerical example.     

公路环境影响评价在饮用水源保护中的应用探讨

文章以广西灌阳至平乐高速公路环境影响评价项目为例,介绍了该路采取的饮用水源保护方案,探讨在环境影响评价工作中如何协调公路工程建设与饮用水源保护的关系,对同类项目环境影响评价工作及公路工程设计均具有借鉴与指导作用。     

厦门港船舶供油作业海事管理分析

文中针对厦门港的船舶供油作业单位和加油船的现状和存在的各种问题进行分析,并就解决方法提出意见建议。     

Atmospheric Emissions from Shipping: The Need for Regulation and Approaches to Compliance

Shipping has traditionally been viewed as the least environmentally damaging mode of freight transport. Recent studies have increasingly questioned this perception, as attention has focused on both the greenhouse gas emissions (mainly CO₂) and the emission of health-damaging pollutants (such as sulphur, nitrogen oxides and particulates) by ships. This paper reviews the available evidence on the atmospheric emissions of shipping. It proposes that the profit objective has prompted the pursuit of greater fuel efficiency within the sector, but that reliance on market forces alone is insufficient to deliver on the environmental imperative. The paper outlines the current and planned regulatory regime for the atmospheric emissions from ships and posits that greater, and more diverse, market regulation is required. Alternative general approaches to regulatory compliance are categorised as ‘alternative sources of energy’ or ‘abatement technologies’ and the characteristics of a range of specific options are analysed. The paper concludes that although the shipping industry has been slow to improve its environmental credentials, a combination of regulation and technological innovation provides it with significant potential to dramatically reduce its environmental impact.     

基于小波变换的斜拉桥索双轴漏磁检测方法

针对在役斜拉桥索只能进行无损检测的特点,提出了基于漏磁检测的缆索缺陷探伤方法以及检测电路.由于检测现场空间磁场噪声较强,导致漏磁信号特征不明显,为此,应用二进小波变换的方法,对周向漏磁信号采用基于高斯白噪声的快速离散软阈值算法进行信噪分离,以确定缆索缺陷程度;对轴向漏磁检测信号进行奇异性检测处理,以获取缺陷的精确位置信息.实验结果表明,该方法可实时获取缆绳索缺陷程度和位置信息.     

赣江下游地区各类非点源污染源的影响研究

在国内外相关研究基础上,利用输出系数模型估算了2006-2009年赣江下游流域非点源污染负荷及各类非点源污染源的贡献率。结果表明,畜禽养殖、农业人口和耕地是赣江下游地区非点源污染负荷的主要来源,在TN贡献率方面畜禽养殖>耕地>农业人口,在TP贡献率方面畜禽养殖>农业人口>耕地。针对估算结果,分析了赣江下游地区畜禽养殖、农业人口和耕地形成非点源污染流失的原因,并据此提出建造化粪池等小型污水处理设施和人工湿地等相应的控制措施。