永鑫大桥墩梁塔固结部位应力分析

文章以永鑫大桥为研究对象,采用子模型计算方法对永鑫大桥墩梁塔固结部位进行有限元计算,分析了该部位的局部应力及横、竖向预应力设置对该区域的影响,其计算结果可为同类矮塔斜拉桥设计提供参考。     

小议政府海事信息公开——兼评《政府信息公开条例》对海事政务公开影响

现代法治国家发展历程表明，政务公开是是推进依法行政、建设法治政府的基本前提。政务公开同时是现代海事管理理念的体现，文章通过对相关制度及现状的研究，为海事机构适应新形势下政府信息公开工作提出了相应的建议。     

运政电子政务的地位与作用

介绍了运政电子政务的地位与作用,结合运营工作的实际,指出了运政电子政务对运营工作中技术应用的创新性。     

工程企业与政府合作开发项目的风险管理

研究目的:本文通过识别、评价与政府合作开发项目运作中的风险,提出工程企业风险规避的主要措施.研究结论:合作开发项目风险与一般工程项目风险不同,具有系统性、关联性、多样性等特点.风险管理应综合分析某类风险在总体风险系统中的重要程度及关联性.在与政府的合作开发项目中,要正确处理好政策变动风险、政府诚信风险、市场风险等风险因素,努力防范风险.     

Including local air pollution in airport efficiency assessment: A hyperbolic-stochastic approach

We examine data from Italian airports covering 2005–2008 to include local environmental effects in airport efficiency assessment. We consider both desirable outputs such as aircraft, passengers, and freight movements and some undesirable outputs of airport operations associated with local air pollution. We estimate both a classical distance function with no undesirable output, and a hyperbolic distance function. By comparing the estimated efficiency scores with these two frontiers we show that airport efficiency increases when local air pollution is included in the analysis. Moreover, we show a fleet-mix effect because airports with similar aircraft movements exhibit large variations in the amount of pollution per flight. Last, we find that there is complementarity between desirable and undesirable output: a 1% decrease in pollution has an opportunity cost of a 0.67% reduction in both passenger and freight traffic.     

结构失衡与政府体制改革

我国近期的这场宏观调控的直接动因是经济过热而导致了结构失衡。过度投资与各地的“圈地运动”则成为当前结构失衡的突出表现。国有企业陷于困境是结构失衡的又一深层次表现。国有企业的核心问题是政企不分，现有的政府制度使国有企业无法成为市场经济中的自主主体。在投资失控、“圈地”以及国有企业困境等问题背后都有政府特别是地方政府的影子。当前一系列突出矛盾与问题意味着经济改革的发展把政府体制改革提上了日程，而这一改革的核心问题是“务正业”，也就是说，政府必须退出市场经济中实际主体的角色，把市场主体的角色真正归还给企业，而管好政府该管的宏观经济环境培育与宏观调控工作。     

高速铁路矮塔斜拉桥主梁局部受力行为分析

新建商丘至合肥至杭州铁路工程颍上特大桥在主梁斜拉索锚固区采用相比于隔板更为轻巧的横梁结构。针对这种新颖结构,为更好地了解其受力特性、优化构造细节,建立中支点至中跨跨中间的1/4主梁模型。模型考察主梁横梁局部应力,得到增设倒角可降低此处横向拉应力的结论。同时还关注腹板剪力分配,得到在无索区段中腹板承担较大剪力,有索区段相反的结论。最后通过索力作用下桥面板纵向应力分布模式,显示出索力在桥面板的传力路径,为结构局部优化、横向分析及结构配筋提供依据。     

正交设计法在拖驳船队参数优选中的应用

将正交设计法应用于拖驳船队参数的优选上，对拖驳船队组方案进行技术经济论，通过多级优选，得到了最佳组队方案，并且对油价等因素的变化是否对象最佳组队方案产生影响进行了敏感性分析。     

波形钢腹板组合梁桥的抗剪局部屈曲强度计算

为更精确地计算波形钢腹板局部屈曲强度,在收集国外试验数据的基础上,通过分析已有公式计算结果与实测值的符合程度,对波形钢腹板局部屈曲强度的合理计算方法进行了探讨。     

Selatm — a GIS based program for evaluating the safety benefits of local area traffic management schemes

Particular safety problems relate to traffic on local streets. Local Area Traffic Management (LATM) schemes are often implemented with the objective of counteracting these safety problems. One analytical difficulty in appraising the effectiveness of LATM in dealing with safety problems has been the ‘footloose’ nature of accident locations in a local street network. Seldom are there distinct ‘blackspot’ locations. An area‐wide approach is needed and the interaction between the system and arterial road network must be considered. The paper describes the development of a Safety Evaluation Method for Local Area Traffic Management (termed SELATM). It is a GIS‐based program for analysing accident patterns over time and the evaluation of the safety benefits of LATM schemes. The evaluation is perform at different network levels for various accident variables. The thrust of the program involved the integration of network data with data on accidents and the installed devices to generate summary accident statistics for the various network levels allowing for before and after comparison with a control area. This program as developed is applied to a LATM scheme at Enfield, a suburb in metropolitan Adelaide.