FTA在伙食制冷系统故障诊断中的应用

根据伙食制冷系统各部件的特点分析该系统的常见故障,应用故障树的相关理论,建立伙食冰机的故障树模型,并依据模型对伙食制冷系统发生的故障进行分析.通过实船故障处理事例,验证了合理的故障树模型的利用有利于及时、准确地排除故障.     

近12a湖北省耕地数量变化及其驱动力研究

耕地数量变化对于粮食安全和区域承载力具有重大影响.以湖北省17个市（州）2000-2011年间的耕地和社会经济数据为基础,通过GIS技术和主成分分析法,研究了湖北省近12a的耕地数量变化、空间分异和驱动力.研究结果表明：湖北省的耕地数量在2000-2003年期间呈递减态势,2004年后耕地数量逐年缓慢增长,全省范围内耕地数量变化表现出西部减少、东部增多的空间分异;人口、经济科技进步和政策导向是全省耕地数量变化的主要驱动力.研究旨在为湖北省耕地保护和协调区域人地关系提供相关参考.     

Digitally controlled boost PFC converters operating with large scale load fluctuations

When boost power factor correction （PFC） circuit works with large scale load fluctuations, it is easy to cause a higher total harmonic distortion and a lower power factor because of traditional controllers and inductor cur- rent mode. To solve this problem, this paper proposes a PFC control system, which can operate with load fluctuations up to 1 000 W by using duty cycle feed-forward control theory to achieve smooth switching mode. The duty cycles in the next period of the control system are pre-estimated in the current cycle, which enhances the speeds of AD samplers and switching frequency, and reduces the cost and volume of the equipment to some extent. Introductions of system decoupling and feed-forward of input-voltage greatly improve the system performance. Both theoretical simulation and experimental results prove the advantage of the proposed scheme.     

“紫金模式”下资源勘查工程专业本科生企业培养方案框架体系与运行机制

福州大学紫金矿业学院依据"由企业支持办学建设、参与办学过程、检验办学成效"的运行与管理机制的"紫金模式",确定本科生的第六学期教学活动在上杭教学实践基地运行,主要由"工程实践型"企业教师承担的专业必修课、选修课和专业实习与实践以及课程设计等组成。已经组建的一支热爱教学工作、理论基础扎实、实践经验丰富、熟悉教学管理要求的企业"工程实践型"教师团队,在各教学环节中发挥了重要的互补作用。企业培养环节下一步需要加大基地的软件实力建设,努力提高"工程实践型"教师的教学水平与教学研究能力,面对新一轮国家战略调整对地矿行业的冲击,不断拓展企业实践的方向与合作企业范围,保障人才培养质量与学生就业的广适性。     

A review on high power SOFC electrolyte layer manufacturing using thermal spray and physical vapour deposition technologies

Manufacturing of solid oxide fuel cell （SOFC） components remains nowadays a key point for the indus- trial development of this technology. Especially, the deposition of the dense electrolyte layer which is sand- wiched between the porous anode and the porous cathode is of paramount importance and thus focuses a lot of attention. Therefore, this paper considers and reviews recent developments concerning solid electrolyte layers manufacturing using thermal spray （TS） and physical vapour deposition （PVD） technologies.     

Wind turbine fault detection based on SCADA data analysis using ANN

Wind energy is one of the fast growing sources of power production currently, and there is a great demand to reduce the cost of operation and maintenance. Most wind farms have installed supervisory control and data acquisition （SCADA） systems for system control and logging data. However, the collected data are not used effectively. This paper proposes a fault detection method for main bearing wind turbine based on existing SCADA data using an artificial neural network （ANN）. The ANN model for the normal behavior is established, and the difference between theoretical and actual values of the parameters is then calculated. Thus the early stage of main bearing fault can be identified to let the operator have sufficient time to make more informed decisions for maintenance.     

A hybrid point cloud alignment method combining particle swarm optimization and iterative closest point method

3D quality inspection is widely applied in many industrial fields including mould design, automotive and blade manufacturing, etc. A commonly used method is to obtain the point cloud of the inspected object and make a comparison between the point cloud and the corresponding CAD model or template. Thus, it is important to align the point cloud with the template first and foremost. Moreover, for the purpose of automatization of quality inspection, this alignment process is expected to be completed without manual interference. In this paper, we propose to combine the particle swarm optimization （PSO） with iterative closest point （ICP） algorithm to achieve the automated point cloud alignment. The combination of the two algorithms can achieve a balance between the alignment speed and accuracy, and avoid the local optimal caused by bad initial position of the point cloud.     

我国“校本课程开发”话语演变及问题分析

在我国,"校本课程开发"实际上存在两套话语:课程政策话语与学术界主流话语。当前政策话语淡化而主流学术话语主导已成基本事实。我国校本课程开发理论话语由西方引入、转化而来,而基于本土课程开发实践的研究严重不足,由主流学术话语指导的中小学校本课程开发实践,在全国范围内基本陷入凌空踏虚、难以落实的尴尬。校本课程开发再概念化,从多维度拓展校本课程开发概念内涵,恰与政策话语神合,是一种立足现实,可以不断推进的校本课程开发策略。     

《鲁颂·閟宫》“新庙”考论

《诗经·鲁颂·閟宫》末章云:"松桷有舄,路寝孔硕,新庙奕奕。"历来的研究者在"新庙"所指为何的问题上歧见纷纭。从此诗内容出发,结合《左传》僖公年间的记载,并参照考古资料,可知"新庙"并非闵公庙或僖公庙,亦非姜嫄庙,而是指鲁僖公在位晚期重新修建的宗庙建筑,起因是僖公二十年鲁国西宫发生的火灾,建成时间约在僖公二十八年至僖公三十三年之间。     

层次分析法在ESP教材实效性评价中的应用

为探讨ESP教材在教学过程中的实效,结合专业特点和ESP特点,建立ESP教材实效评价模型,采用层次分析法,评价不同ESP教材中不同评价指标的实效,并以物理专业三种ESP教材为例进行模型验证,为教师进一步科学合理设计、编写和选择教材提供参考.