二次预应力连续梁的施工过程分析

根据二次预应力连续梁的施工过程，提出了施工阶段的应力和变形分析方法。通过对常规预应力连续梁的计算结果对比，可以看到二次预应力组合结构可大大改善反拱过大等问题。     

面向对象的新规范预应力混凝土筒支梁桥计算程序的开发与应用

该文从开发适应04新版公路桥规简支梁计算程序的必要性出发，详细介绍了作者开发面向对象的简支梁程序的核心计算原则和算法，并将结果和国内软件进行比较，同时给出了面向对象程序的设计方法，具有很强的实用性。     

简评《鹿特丹规则》的“海运履约方”制度

《鹿特丹规则》首次设计了＂海运履约方＂制度,确定了非合同主体的责任基础,扩大了非合同责任主体范围,部分突破了合同相对性原则,更利于货方索赔和权利救济;＂海运履约方＂与承运人同等承担义务和赔偿责任,全面加重了义务、风险。该制度预期对中国航运、物流业产生全面影响,应当采取积极应对措施。     

Economic benefits of introducing LNG-fuelled ships for imported flour in South Korea

As the concerns about air pollution have steadily increased, the perception that ships are the source of pollutants and toxic emissions is also expanding. Thus, the International Maritime Organization (IMO) is tightening maritime regulations to reduce air pollution from ships. Currently, the government and related industries are trying to replace heavy fuel oil with liquefied natural gas (LNG) to counter future IMO regulations. Since the use of LNG is expected to increase costs, it is necessary to estimate the social benefits to determine the legitimacy of the replacement. The purpose of this study is to analyse the public’s willingness to pay (WTP) for products imported in LNG-fuelled ships using the contingent valuation method. Flour, the most of which is currently imported in South Korea, is chosen as the subject of empirical analysis. As a result, the mean additional WTP was KRW 571 (USD 0.51) per kg. This value corresponds to about 36% of the existing flour price. Therefore, South Korean households are willing to pay a considerable premium on the flour imported via LNG-fuelled ships. These results can serve as useful bases for future LNG bunkering-related policies.     

拉弯扭共同作用下RC构件极限扭矩试验研究

根据８根钢筋混凝土拉弯构件扭强度的试验结果,对拉弯扭构件的破坏形态,纵筋及箍筋的应力应变规律等问题进行了分析研究。论文以变角桁架理论为基础,推导出拉弯扭构件相关方程,提出了在较大轴拉力情况下的计算拉弯扭构件极限扭矩的实用公式。     

芜湖长江三桥施工浮桥设计

芜湖长江三桥主桥桥墩均位于水中,需搭设施工浮桥用于水中墩施工混凝土输送及人员通行.芜湖侧浮桥布置于5号墩和3号桥塔墩之间,长272.3 m,跨径布置为(35.5+6×36+18)m,桥面净宽3.3m.浮桥设计采用“浮箱+贝雷梁”结构,横向布置4榀贝雷梁,桥面板采用I10@750 mm分配梁+6 mm厚花纹钢板组成,桥面...     

重载列车制动对轨道纵向力影响的研究

本文采用有限元法,考,虑了列车荷载下轨道阻力的作用,以及各种因素对纵向力的影响进行了 分析和计算,并通过室内模型试验,验证了理论计算的正确性。      

基于语义模型关联规则的局域网数据检索

提出一种基于语义模型关联规则的局域网数据检索方法.首先基于概念树描述语义模型并建立FP-树频集算法,通过概念映射将数据源与语义模型进行语义关联,在此基础上,进行噪声过滤并列出主题关键词,从而提高局域网的数据检索速度和一次查询效率.     

The impact of outcome framing and psychological distance of air pollution consequences on transportation mode choice

Recent years, air pollution phenomenon has become one of the crucial problems of Tehran, Iran. Due to main political and economic role of Tehran, population of this metropolis is high and increasing. Urban transportation of this highly populated city contributes more than 70% of air pollution problem in this city. Although a number of urban transport developments, policy measures and regulations have been employed, Tehran’s air pollution has remained crucial thus far. Finding ways to encourage individuals to behave more sustainable can be considered as a substantial approach of tackling environmental problems such as air pollution, since it can be highly cost-effective and fast. This research attempt to evaluate the impacts of two factors of outcome framing and psychological distance of air pollution on citizen’s willingness to behave environmental friendly, particularly to change the travel mode choice. Results illustrate that communicating the consequences of air pollution can provoke individuals’ to act more environment friendly or in particular to change their intention for using more sustainable mode of transportation. Framing the positive consequences of mitigating air pollution take precedence over framing the negative consequences. Moreover the gains of mitigating air pollution have an impact on the willingness to use of bicycle and bus. Results also show that decreasing the psychological distance of air pollution in order to make manipulated frame more personally relevant has no significant impact on respondents.     

试用QC控制小曲率半径盾构推进

随着上海轨道交通的迅速发展,盾构法施工的隧道工程受环境的制约越来越大。该文从监理的角度,运用现代质量管理手段着重介绍了小曲率半径盾构推进轴线控制的监理措施和方法。