浅谈基建维修的渗漏问题

在基建项目中，屋面、卫生间、给排水管渗漏现象比较普遍。文章分析了这种现象产生的主要原因及影响，并从设计、施工的角度提出了防治措施，以供参考。     

管道泄漏检测技术应用分析

近年来油气输送管道泄漏事故时有发生，从而造成经济损失和环境污染，因此，对液体输送管道进行检测和定位的研究与实践非常必要。总结了国内外液体输送管道泄漏检测与定位的主要方法，分析了各种方法的原理及优缺点，提出了实际实施过程中应注意的问题及相应对策。     

Private information in currency markets

Using daily abnormal currency returns for the universe of countries with flexible exchange rates, we show local currency depreciations ahead of unscheduled, public sovereign debt downgrade announcements. Consistent with the private information hypothesis, the effect is stronger in lower institutional quality countries and holds after we control for concurrent public information and for publicly available rumors about the forthcoming downgrades. Our results persist when abnormal currency returns are adjusted for global carry and dollar risk factors, world equity and bond returns, as well as local stock market returns. Finally, the currency depreciations are permanent, providing evidence for a link between fundamentals and currency markets.     

Supply‐ versus Demand‐Side Policies in the Presence of Carbon Leakage and the Green Paradox

We consider a climate coalition that seeks to reduce global emissions in the presence of carbon leakage and resource exhaustibility. We show that a credible announcement of future unilateral supply‐side policies delays foreign emissions, and we derive the optimal combination of consumer taxes and producer taxes when we consider leakages from free riders, both within periods and across periods. The tax shares generally differ over time. A decline in the present value of the social cost of carbon over time supports a time path where the consumers’ tax share of the total carbon tax also declines over time. We illustrate our findings with a numerical model.     

THE IMPACT OF THE EU EMISSIONS TRADING SYSTEM ON COMPETITIVENESS AND CARBON LEAKAGE: THE ECONOMETRIC EVIDENCE

This paper carefully surveys the econometric literature that tests for competitiveness effects and related carbon leakage caused by the EU Emissions Trading System (EU ETS). The results of this literature tell us that to date there is no evidence of the EU ETS having had widespread negative or positive effects on the competitiveness of regulated firms, nor is there evidence of significant carbon leakage. However, the paper also identifies three important caveats to this general conclusion. Firstly, the evidence we have still largely refers to the first two trading periods, namely Phases I (2005–2007) and II (2008–2012). Secondly, some heterogeneity of estimated effects is observed, but patterns, notably sectoral patterns, hardly emerge. Thirdly, very little explored is whether the EU ETS has had long-term effects on the economy via investment leakage or firm dynamics. Further empirical studies investigating these long-term effects are particularly desirable.     

Supply-and-demand models for exploring relationships between smaller airports and neighboring hub airports in the U.S.

Airport passenger leakage is the phenomenon of air passengers choosing to travel longer distances to access more extensive air services offered by airlines at an out-of-region hub (or, substitute) airport, instead of using their local airports. Airport leakage can cause further reduction in services offered by airlines at a local airport, thereby causing even further leakage, and so on, which can significantly impact an airport's role in the growth of the local economy. This paper explores the geographic and operational attributes of local-and-substitute airport pairs in the United States, explicitly accounting for the interactive feedback relationship between passenger volumes and air service characteristics that contribute to the onset, persistence, and exacerbation of airport passenger leakage. A two-stage least squares regression model of air passenger demand at small- and medium-sized airports is first presented, where local passengers may travel by vehicle to larger, out-of-region hub airports. The results confirm that airfare and passenger volume relationships exist between the local and substitute airport pairs included in the dataset, and that lower airfares at the substitute airport have a greater impact on airport choices made by larger travel groups. They also suggest the existence of positive feedback in that if an airport attracts increasingly smaller passenger numbers with fewer air services and fewer air services with fewer passengers, without external intervention airport leakage impacts may be irreversible and exacerbate over time. A conceptual market share equilibrium analysis is used to illustrate the mechanisms of a direct two-way feedback relationship between passenger volumes at a local airport and air service characteristics at both the local and substitute airports. With data, this quantitative framework can help guide airport planners in further assessing and verifying suspected passenger leakage issues at their airport. The results suggest that without intervention, airport leakage impacts may be difficult to reverse; further exacerbating the trend are technological advancements that make driving cheaper and easier (connected and autonomous vehicles). However, the results can also guide planners in choosing the types and degrees of infrastructure investments and airline incentives that may be used to expand or retain air services to attract passengers.     

浅谈建筑工程中渗漏的防治措施

建筑工程的渗漏问题是建筑工程质量问题中的一大通病,渗漏问题也越来越受到人们的关注。因此,减少建筑工程渗漏问题的出现,这已经成为建筑工程控制质量最重要的一点。本文在介绍建筑工程中常见渗漏问题的基础上阐述了渗漏问题的防治措施。     

《物权法》对部队营房管理的几点思考

随着军队住房改革制度和营区综合配套整治工作的深入进行以及国家和军队有关法规政策的调整,特别是《物权法》的出台,军队营房管理人员面临着更高的要求,本文围绕这一课题,就新政策给部队营房管理及部队管理工作带来的影响进行了探讨、提出了当前做好部队营房管理工作的建议。     

基于需求信息泄露的企业利润及社会效益研究

供应链中的信息对于供应链参与者的利益及供应链的绩效是有价值的,旨在对需求信息的泄露问题展开分析。给出了1个供应商2个零售商的基本模型,从供应商是否泄露零售商信息上给出了非泄露均衡和分离均衡下的零售商利润及供应商利润,并进一步从社会效益角度对2种信息保有情况展开了对比分析。研究得出:对跟随者而言,高需求下以及低需求且θ≥3下的零售商利润可以通过平均市场需求的范围进行确定;对于社会效益而言,高需求且非泄露信息下带来的社会效益总是优于分离均衡下的社会效益。     

飞力潜水泵监控系统介绍及泄露故障案例分析

介绍了ITT飞力潜水泵监控保护系统,总结了该系统在运行过程中遇到的问题,对常见泄漏故障案例进行了分析,并提出了相应的解决办法。