锚固桩水磨钻施工工艺及经济分析

铁路增建Ⅱ线锚固桩施工紧邻既有线,采用传统的钻爆法施工工艺易受“天窗”点施工的影响,人员和机械设备的施工效率大大降低,且安全风险高,成本较大。此文通过襄渝Ⅱ线锚固桩水磨钻施工工艺的经济技术分析,得出水磨钻的成本和定额基价。经过与传统钻爆法进行比较,显示出水磨钻施工工艺具有安全、经济、实用等特点,具有较好的推广利用价值。     

强化设备有效管理方法探讨

从大中型企业普遍存在的设备老化、维修费用紧张等问题入手,就如何加强设备管理,降低设备成本,提高经济效益,从强化设备低保、开展设备检测、加强配件管理、改革管理体制4方面分别进行了论述.     

对全油门燃料消耗量试验方法的改进建议

用原GB12545—90标准中全油门加速燃料消耗量的试验方法，对2台同型号轻型载货汽车进行燃料经济性能对比试验后发现，2台车的试验数据分析结果不符合实际情况。对问题产生的原因加以分析，并对GB12545—90标准中全油门加速燃料消耗量的试验方法提出改进建议及对GB12545．2—2001标准提出了补充。用改进后的试验方法对原车型进行了试验，结果表明其可以有效地解决原试验方法中存在的问题。     

关于城市轨道交通项目财务内部收益率和资金缺口的问题

结合我国城市轨道交通的发展现状,通过对财务内部收益率涵义的分析,对同一城市不同层次线路的财务内部收益率及其与基准收益率的关系进行说明.通过分析城市轨道交通项目资金缺口的形成原因及主要影响因素,剖析了资金缺口与项目资本金投资净现金流量的关系.探讨了几种适合我国国情的轨道交通项目运营资金缺口的政府财政补贴模式,为今后规范城...     

如何加强对国外经济援助项目的综合管理

为加强对国外经济援助项目的综合管理,优质高效地完成经济援助项目,在项目实施前,要择优选定实施企业,选派具有施工管理经验和资质条件的各类主要管理人员;在项目实施过程中,要建立责、权、利相结合的激励机制,以物资供应、工期、安全和质量为管理重点,厉行合同。     

箱梁预制先张法与后张法经济比较

目前我国道路交通特别是高速客运专线飞速发展,桥梁工程大幅增加,箱梁用量也随之大增,其对建设成本的影响不容小视。为合理选择箱梁的施工工艺,运用投资成本分析法对箱梁先张法和后张法造价的影响因素和经济技术指标进行研究。     

区域经济共生系统形成机理探析

以生物学的共生理论为依据,分析了处于一定自然区域中的经济实体之间所发生的共生现象及其形成机理,阐释了区域经济共生系统的内涵及其构成要素,对共生系统的均衡条件和稳定性进行了分析,并为合理构建区域经济体系提出了一些建议.     

Integrated Environmental Modeling and Assessment of Coastal Ecosystems: Application for Aquaculture Management

This article presents an approach that couples coastal ecosystem modeling with integrated environmental assessment methodologies to support coastal management. The focus is to support the development of an ecosystem approach to aquaculture management including interactions with watershed substance loading. A Chinese bay, with intense aquaculture and multiple catchment uses, and where significant modeling efforts were undertaken is used as a case study. The ecosystem model developed for this bay is used to run scenarios that test the local management strategy for nutrient reduction. The corresponding ecological and economic impacts of the managers’ scenarios are analyzed by means of the Differential Drivers-Pressure-State-Impact-Response (ΔDPSIR) analysis. Emphasis is given to the analysis of the eutrophication process in the bay including present eutrophic condition and the expected changes due to the simulated scenarios. For this purpose, the Assessment of Estuarine Trophic Status (ASSETS) screening model is a valuable tool to interpret and classify the data and model outputs regarding eutrophication condition and to evaluate the manageable level of the nutrient loading entering in the bay.     

The Potential Economic Benefits of Coastal Ocean Observing Systems: The Southeast Atlantic Region

The Southeast Atlantic Coastal Ocean Observing System (SEACOOS) collects, manages and disseminates coastal oceanic and atmospheric observation information along the Atlantic coast of the southeastern United States. This article estimates the benefits of SEACOOS information in eleven benefit categories. Following a methodology used in similar studies of other U.S. coastal regions, we evaluate the impacts of conservative changes in economic activity in each benefit category. The annual economic benefit of SEACOOS information is $170 million (2003 $), an estimate that falls between annual benefits of $33 million for the Gulf of Maine region and $381 million for the Gulf of Mexico.     

预应力混凝土斜拉桁架桥结构特征分析

该文分析了预应力混凝土斜拉桁架桥的结构特征,与其他桥型的对比,结构受力特性,发展趋势及经济性能。