Understanding Recreational Boater Attitudes to Zoning in a Proposed Marine Protected Area

Although the success of marine protected areas (MPAs) and associated zoning schemes is largely dependent on stakeholder acceptance and support, there have been relatively few studies examining the response of recreational stakeholders to MPA proposals. This study investigates the response of recreational boaters to a proposed MPA in British Columbia, Canada. Using a structured questionnaire (n = 543) and a focus group (n = 6), the research examines the level of support for the concept of marine zoning and identifies key factors influencing support or opposition. Results indicate that a small majority of recreational boaters support the concept of marine zoning, but that there are areas of concern that ought to be addressed as MPA implementation proceeds. Support for zoning was strongly related to perceived benefits, particularly environmental benefits. Furthermore, perceived benefits overall were found to outweigh concerns as determinants of recreational boater support for zoning. Major dimensions of opposition included perceptions of over-regulation, loss of access for boating, and mistrust of the government. A suggestion is that such concerns may be mitigated through focused communication and meaningful involvement of boaters in the zoning process.     

In situ colonization of marine biofilms on UNS S32760 duplex stainless steel coupons in areas with different water qualities: Implications for corrosion potential behavior

In the presence of biofilms, stainless steels （SS） exhibits an increase in corrosion potential, called ennoblement. In the present study, the corrosion potential （Eco,） behavior of the duplex SS UNS S32760 was recorded simultaneously with the in situ marine biofilm formation in two areas at Arraial do Cabo, Southeastern Brazil. The biofilm at Forno Harbor （an anthropogenically disturbed area） was characterized by higher relative abundances of Bacteria at day 2, followed by diatoms （especially Navicula sp.） on day 10 and dinoflagellates on day 18, whereas no clear trend was recorded at Cabo Frio Island （an undisturbed area）. The ennoblement of Ecor values was site-dependent. In a complementary laboratory assay, biofilms were removed and the Eco values registered in sterile conditions for the subsequent 10 days and corroborated in situ results. Understanding biofilms and SS interactions has important implications for materials science and engineering decisions as well as helping to fill in imnortant gaps in this knowledge.     

燃油式红外线辐射加热技术在预热机上的应用

介绍了国内外沥青路面就地热再生加热技术的现状,提出了一种新型的燃油式红外线辐射加热技术。利用经验设计的方法,研发出了燃油式红外线辐射加热装置,采用系统分析法,对该装置的结构、功能及其工作流程进行了详细论述,并结合施工应用,验证了该加热技术的可行性,对关键控制技术进行研究,提出了利用PLC控制技术的改进方法。     

WT445电站故障实例剖析

通过对WT445电站监控系统主要任务和工作过程的阐述,分析该电站自动监控开关投入运行后自行停机的原因,给出故障分析的思路和排除故障的基本方法。     

汽车电动助力转向系统

对目前汽车配置的助力转向系统做了简要比较,指出了机械液压和电子液压助力的缺点,介绍了电动助力转向系统的构成、工作原理、以及主要设计参数和控制特性。此系统的优点是节约能源,提高操作稳定性,是将来动力转向的发展趋势。     

无证驾驶自动查处系统的设计与探讨

文章结合现有的无证驾驶查处方式带来的问题和弊病,基于智能交通系统的相关技术,介绍了无证驾驶自动查处系统功能模块的设计、安装及关键技术,为无证驾驶系统的研发提供参考。     

变速比转向器齿轮副的机理分析

本文运用啮合原理分析方法给出了变速比转向器齿条齿扇传动的啮合线方程、齿扇的齿廓方程,导出了锥形齿扇被切削时小端不根切、大端不尖的变位系数和齿扇几何尺寸计算公式。     

汽车非线性变速比转向器

从齿轮原理，相对运动和滞后现象等机理出发，阐述了非线性变速比转向器偏心齿扇副的运动规律，推导出主要几何参数之间的数学模型，从影响速比和啮合间隙变化的因素入手，通过对几种传动方案的分析，给出了合理可行的齿扇副传动方案。     

一种用于大型工程机械的全液压转向系统

针对大型工程机械转向系统，分析了丹麦Sauer Danfoss公司最新推出的一款OSPBXLS型全液压转向器和OSQA型流量放大器的结构、工作原理和主要性能特点。并在此基础上设计了一种用于大型工程机械的全液压转向系统，解决了大型工程机械操作困难的问题。     

独立悬架车辆转向轮侧滑及其影响因素的试验研究

结合独立悬架车辆转向轮定位参数的特点,采用二元二次回归正交组合设计方法设计了试验方案,并对影响转向轮侧滑的轮胎胎压、载荷和车速等相关因素进行了试验研究。通过对试验数据进行回归处理,得到了侧滑量与转向轮定位参数间的定量映射关系,并对其进行了回归系数、回归方程的显著性检验和失拟检验。结合汽车动力学相关理论对试验研究结果进行了分析。