新型双机双筒高效吸鱼泵及其控制系统设计

新型高效吸鱼泵由双真空泵、双吸鱼筒组成,利用双筒交替吸鱼、排鱼,可实现连续鱼虾起捕,其效率是单筒间歇式吸鱼泵的1.5倍以上,有效解决了传统真空吸鱼泵存在的效率低、功耗大的问题;双真空泵可互为备用,也可轮流使用,通过冗余设计提高设备的可靠性,这对远洋捕捞业尤为重要;该吸鱼泵采用真空负压抽吸和零压排放原理,有效提高活鱼成活率;主吸鱼管采用套管式结构,可在水平、垂直方向灵活伸缩;控制系统采用全程自动化控制。     

绿色制造工艺在船舶结构中的设计及应用

造船业对于水源影响作用巨大,为了顺应社会环保的要求,船舶工程需要转变过去污染水源、浪费原材料、破坏大气等弊端,这就对船舶结构设计与船舶制造提出了较高的环保性要求,在船舶工程的设计与制造中需要充分融入绿色理念,要全面遵循环保要求,积极打造稳定性强、航速快、性能高的绿色船舶。文章首先立足于绿色船舶的概念与特点进行了分析,然后分别针对绿色船舶的结构设计和制造两个方面提出相应的实施途径,指出了在保障船舶的功能性、使用性能以及安全性能等基础的情况下,实施绿色船舶的设计与制造的重要意义。     

A Pareto-improving hybrid rationing and pricing policy with multiclass network equilibria

This paper extends the work on Pareto-improving hybrid rationing and pricing policy for general road networks by considering heterogeneous users with different values of time. Mathematical programming models are proposed to find a multiclass Pareto-improving pure road space rationing scheme (MPI-PR) and multiclass hybrid rationing and pricing schemes (MHPI and MHPI-S). A numerical example with a multimodal network is provided for comparing both the efficiency and equity of the three proposed policies. We discover that MHPI-S can achieve the largest reduction in total system delay, MHPI can induce the least spatial inequity and MHPI-S is a progressive policy which is appealing to policy makers. Furthermore, numerical results reveal that different classes of users react differently to the same hybrid policies and multiclass Pareto-improving hybrid schemes yield less delay reduction when compared to their single-class counterparts.     

Locating rental stations and bikeways in a public bike system

To determine the spatial distribution of rental stations and bikeways in a public bike system, this paper proposes a facility location and network design model. The model is developed as a multi-objective programing problem that considers four objectives (minimizing cyclist risk, maximizing cyclist comfort, minimizing adverse impacts on traffic and maximizing service coverage) and multiple constraints (monetary budget, network connectivity, station spacing, bikeway types, station number and value ranges of decision variables). The ε-constraint method solves the programing problem for the public bike system in Daan District, Taipei City, Taiwan. The nine non-dominated alternatives generated are all markedly better than existing locations of rental stations and bikeways. Scenario analysis results indicate that increasing the construction budget for bikeways significantly improves cyclist safety and comfort whilst increasing the adverse impact on traffic. Planners can use this model to develop public bike systems that spatially integrate rental stations and bikeway networks.     

盐穴天然气地下储气库运行过程的关键技术问题

在具有岩盐矿床地质构造的地区,将天然气储存在地下含盐岩层内,实现在短期内提供高容量的储备,是目前各国普遍采用的方法。结合国外相关技术文献及部分研究成果,对盐穴储库运行过程的关键技术问题,主要包括:如何在运行过程减少溶腔的收敛性,防止水化物的形成,溶腔建腔过程形成的冷带和残留盐水对运行过程的影响;垫层气技术、运行的稳定性及注采循环中应注意的问题。文中分别进行了较详细的论述,为今后国内盐穴储库的运行研究提供依据和技术支持。     

Assessing asymmetric response effect of behavioral intention to service quality in an integrated psychological decision-making process model of intercity bus passengers: a case of Taiwan

This study introduces the concept of loss aversion to consumer behavioral intention at the personal psychological level to develop an integrative structural equation model for analyzing traveler psychological decision making. In this model, the relationship between behavioral intention and service quality is a non-smooth function based on the theory of loss aversion. The expectation service quality in the SERVQUAL model proposed by Parasuraman, Zeithaml, and Berry (PZB) serves as a reference point. This model can be applied to analyze the effect of non-smooth response of behavioral intention to service quality in a traveler psychological decision-making process model. Intercity travel among cities in Taiwan is used as an empirical example. Data were gathered in cities in Taiwan via a questionnaire survey, and the model was tested using path analysis performed by LISREL. The empirical result shows that all causal relationships are statistically significant. Service quality loss influences repurchase intention more than does Service quality gain. Finally, this study concludes by discussing managerial implications and suggesting directions for future research.

大型地下互通式立交型式选择和路线标准研究

文章通过对地下和地面立交对比分析,给出了三路和四路地下立体交叉的几种立交型式建议;并从造价和行车安全的角度,给出了地下立交分岔隧道的部分路线标准确定方法。在地下隧道立交的选型中,应尽量选取少交叉口、少叠交层次和行车视距较好的型式。在路线标准的选择中,尤其要注意满足运营速度下的停车视距,以保障行车安全。在考虑安全因素的同时,经济性和工程造价也是决定隧道型式和路线标准的重要因素。     

基于GPS和GSM的清管器智能跟踪系统

为了在清管施工中实时跟踪清管器,设计一种基于GPS系统和GSM通信系统的智能清管器跟踪系统,系统包括发射机、中继器和监控系统。发射机搭载在清管器上持续发射电磁信号和静磁信号,中继器预先埋设在设定的跟踪点接收和转发通过信息;清管器通过跟踪点时,中继器接收发射机发出的信号,精确识别出清管器并将通过时间和跟踪点GPS位置信息通过GSM网络发送至监控系统;监控系统接收到信息后,在监控界面地图上实时显示通过位置和通过时间。清管器卡堵时,系统可及时在地图上指示卡堵区间和到达卡堵现场路径。现场应用表明:该系统实现了清管器智能跟踪,通过时间和通过位置记录精确,降低清管施工中安全风险,节约成本。     

硅油型制动液的研究及应用进展

硅油型制动液性能优异,能显著延长制动液更换周期,减少车辆维护成本。本文综述了国外硅油型制动液的研制进展、产品组成、美军产品规范MIL-PRF-46176B和SAEJ1705标准,以及硅油型制动液在车辆上的应用情况。     

不同固化剂对路用水性环氧树脂工作性能的影响

为进一步提升路用水性环氧树脂工作性能及使用品质,选取两种环氧树脂和5种固化剂,采用固化剂乳化法,制备了不同类型水性环氧树脂,对比评价了不同固化剂类型及掺量下水性环氧树脂拉伸、弯曲、黏结等工作性能.并基于水性环氧树脂工作性能演变规律,确定了最佳固化剂类型及其适宜掺量.结果 表明:对于E-44和E-51两种类型的环氧树脂,...