30kW微燃机电、热联供机组开发应用技术与经济分析

简单介绍了微燃机电、热联供机组工作原理，详细对比分析了工程实例与普通柴油发电机组及锅炉采暖技术与经济性能参数，对以后野外施工及偏远无市电地区能源保障提出了看法。     

间歇式沥青拌和站冷料供给系统流量的标定方法

以实例介绍间歇式沥青拌和冷料供给系统流量的标定方法和步骤，以确保冷料供给器按目标配合比准确供料，使沥青混合料的生产配比更加接近目标配比，保证拌和成品料的质量。     

Greenhouse gas emissions from ships in ports – Case studies in four continents

Emissions of GHG from the transport sector and how to reduce them are major challenges for policy makers. The purpose of this paper is to analyse the level of greenhouse gas (GHG) emissions from ships while in port based on annual data from Port of Gothenburg, Port of Long Beach, Port of Osaka and Sydney Ports. Port call statistics including IMO number, ship name, berth number and time spent at berth for each ship call, were provided by each participating port. The IMO numbers were used to match each port call to ship specifications from the IHS database Sea-web. All data were analysed with a model developed by the IVL Swedish Environmental Research Institute for the purpose of quantifying GHG emissions (as CO₂-equivalent) from ships in the port area. Emissions from five operational modes are summed in order to account for ship operations in the different traffic areas. The model estimates total GHG emissions of 150,000, 240,000, 97,000, and 95,000 tonnes CO₂ equivalents per year for Gothenburg, Long Beach, Osaka, and Sydney, respectively. Four important emission-reduction measures are discussed: reduced speed in fairway channels, on-shore power supply, reduced turnaround time at berth and alternative fuels. It is argued that the potential to reduce emissions in a port area depends on how often a ship revisits a port: there it in general is easier to implement measures for high-frequent liners. Ships that call 10 times or less contribute significantly to emissions in all ports.     

第三轨供电系统中受流器与第三轨的接触压力及其对受流性能的影响分析

介绍了第三轨受流器的结构原理。分析比较了弹簧式和气压式受流器与第三轨接触压力调节方式的特点。基于电接触基本理论详细的阐述了受流滑板与第三轨接触区的导电机理。接触区域的导电电路由无数微小的电阻及电容并联而成,接触压力通过影响微小电阻、电容的数量比例,进而影响接触面上的导电能力和磨损性能。标称静态接触压力的设计值接近或等于"法向压应力临界值"时,导电能力和磨损特性取得均衡。     

军港磁谐振式无线供电动态调谐技术分析

磁谐振式无线电能传输具有高效率、灵活性和安全性的优势,利用它来实现军港无线供电具有广阔的应用前景。本文首先建立了磁谐振式无线电能传输系统的互感电路模型,分析了系统特性;在此基础上系统分析了磁谐振式无线电能传输动态调谐技术;最后立足于实际应用提出磁谐振式无线电能传输技术的军港应用亟待解决的几个问题。     

Optimal planning of liquefied natural gas deliveries

We investigate the problem of designing an optimal annual delivery plan for Liquefied Natural Gas (LNG). This problem requires determining the long-term cargo delivery dates and the assignment of vessels to the cargoes while accommodating several constraints, including berth availability, liquefaction terminal inventory, planned maintenance, and bunkering requirements. We describe a novel mixed-integer programming formulation that captures important industry requirements and constraints with the objective of minimizing the vessel fleet size. A peculiar property of the proposed formulation is that it includes a polynomial number of variables and constraints and is, in our experience, computationally tractable for large problem instances using a commercial solver. Extensive computational runs demonstrate the efficacy of the proposed model for real instances provided by a major energy company that involve up to 118 cargoes and a 373-day planning horizon.     

地铁道岔尖轨线型复核及矫正

地铁道岔尖轨是道岔实现转换功能的主要部件之一，尖轨线型不良不仅使列车产生晃动，也会影响与基本轨的正常靠贴和自由状态平面位置。尖轨与基本轨靠贴时存在离缝、卡阻和尖轨原始位置不准，会使尖轨失去稳定刚度和增大道岔锁闭“框动”、转换动力以及出现转换反弹现象，继而恶化通号转辙设备的工况，影响道岔的正常使用。由此，轨道专业人士应高度重视尖轨的线型控制。在实践的基础上，认真分析尖轨从生产制造、运输、存放、上道使用过程中线型发生不良变化的成因，提出相应对策措施；并介绍尖轨线型的检测复核和矫正手段。其中，首次倡导“一弦矢距法”检测复核整根尖轨线型的现状，特别针对曲线型尖轨，通过建立数学模型计算得到“一弦”条件下尖轨各检测点理论矢距值，为尖轨上道前进行预矫正提供了依据，这对地铁停运后的有限时间天窗内圆满完成尖轨更换作业意义重大。     

港口干散货物流供应链信息协同运作模式分析

在国内外供应链管理研究及河北港口群煤炭业务现状调研分析的基础上,剖析现阶段港口煤炭供应链运营管理的问题。聚焦河北港口群煤炭供应链模式构建过程,梳理港口煤炭供应链管理流程,构建河北港口群供应链管理模式、物流协同模式、物流体系及物流供应链协同信息化支撑模式,解决制约港口煤炭供应链的信息共享不及时、信息流通不畅等问题。对港口煤炭供应链协同运作信息化体系进行总体框架设计,并选择典型平台建设探讨供应链协同运作信息化体系支撑实现模式,形成高效、科学、先进的河北港口群煤炭供应链管理模式。     

高职学生顶岗实习:现状、问题与对策——基于广州番禺职业技术学院2012届毕业生顶岗实习的调研与分析

通过调研发现:当前高职生顶岗实习存在实习协议难以全面签订、部分学生频繁流动、教学目标偏离异化、轮岗实习较难实现、学校实习管理不够精细、学生权益保障不力等问题。为了解决这些问题,同时提出了相应的建议和对策。     

船用厨房和具有烹调设备的配餐室的通风计算及空气处理方法

本文介绍了ISO 9943-2009国际标准和GBT 20846-2007中国国家标准中对船用厨房和具有烹调设备的配餐室的通风计算及空气处理中提出的送风量的计算方法，提出另一种更易于大家理解和接受的简易计算方法和空气处理过程，供工程技术及设计研究人员参考。