交指型流场结构的质子交换膜燃料电池温度分布特性模拟

质子交换膜燃料电池的温度分布对燃料电池性能特别是输出电流密度有重要的影响，交指型结构流场有效地提高了输出电流密度。本文对交指型流场结构的质子交换膜燃料电池的温度分布进行了研究，对交指型流场结构的质子交换膜燃料电池在电池横贯方向、阳极催化层、膜中心和阴极催化层进行了计算分析，得出了温度分布规律。研究了输出电压分别为0.4、0.6、0.8 V时电流密度变化对流场温度的影响、进出气通道和岸下对应膜的温差，得出了工作电压变化时膜的温度分布规律。     

A study of the rheological behavior of high‐temperature polymer electrolyte membrane solutions

The viscosity behavior of various compositions of polymer electrolyte membrane solutions, which are later hydrolyzed into proton conducting membrane film for fuel cells, is characterized. Using the Carreau‐Yasuda model and time–temperature superposition, an empirical model relating the viscosity as a function of temperature and shear strain rate has been developed for several membrane solution compositions. It is observed that the viscosity of the non‐Newtonian membrane has a strong correlation to the membrane's inherent viscosity (a property determined during membrane synthesis). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

“水立方”围护结构声学性能研究

国家游泳中心“水立方”采用大面积ETFE膜气枕作为围护结构，ETFE膜气枕的声学性能将直接影响比赛大厅的室内声学设计效果与室内装饰效果。在比赛大厅声学设计过程中，建立了声学测试专项实验室，对ETFE膜气枕的声学性能进行测试，获得了真实详尽的数据。本文对声学实验室的建立、声学性能的测试过程做了较为详细的介绍，对测试结果进行了分析与总结，希望对类似材料构造的声学性能测试提供一些参考资料。     

ZMQ型气动薄膜切断阀异常工况原因分析

叙述了ZMQ型气动薄膜切断阀的结构、工作原理及运行中的异常现象 ,认为该型阀门的冲撞和振动是由阀芯上、下端面存在的较大压差所引起     

Prognostics and Health Management of PEMFC – State of the art and remaining challenges

Fuel Cell systems (FC) represent a promising alternative energy source. However, even if this technology is close to being competitive, it is not ready for large scale industrial deployment: FC still must be optimized, particularly by increasing their limited lifespan. This involves a better understanding of wearing processes and requires emulating the behavior of the whole system. Furthermore, a new area of science and technology emerges: Prognostics and Health Management (PHM) appears to be of great interest to face the problems of health assessment and life prediction of FCs. According to this, the aim of this paper is to present the current state of the art on PHM of FCs, more precisely of Proton-Exchange Membrane Fuel Cells (PEMFC) stack. PHM discipline is described in order to depict the processing layers that allow early deviations detection, avoiding faults, deciding mitigation actions, and thereby increasing the useful life of FCs. On this basis, a taxonomy of existing works on PHM of PEMFC is given, highlighting open problems to be addressed. The whole enables getting a better understanding of remaining challenging issues in this area.     

薄膜基础理论

薄膜基础是一种新的基础型式。本文就这种基础的典型情况作了研讨，并详细推导了其计算公式。     

复合膜吸杂技术在硅分立器件制造中的应用

利用复合膜吸杂技术处理硅晶体材料改善硅衬底及外延片质量的吸杂原理.通过三探针测量、DLTS 检测、MOS 电容器弛预时间、器件结特性的改善和成品率的提高显示了复合膜吸杂的吸杂效果.实验结果表明,复合膜吸杂枝术是有效、简便、可控、稳定、成本低廉且与器件制造工艺是相容的.很有开发、推广价值.     

分子筛炭复合膜陶瓷支撑体的研究

炭复合膜对多孔陶瓷支撑体的技术要求，是具有足够的强度，较高的孔隙率及适宜的热膨胀系数．讨论了满足上述要求的多孔陶瓷配方中最适宜骨料、玻璃相及其含量的选择，以及最佳烧成温度的确定．     

分子筛炭膜的孔径分布和气体的临界尺寸

分子筛炭膜包含有分子级大小的孔，它根据气体分子的尺寸不同，表现出对气体的选择透过性，针对此提出了“气体的表现临界尺寸”的概念，它是指气体分子被截留的临界尺寸；并给出了根据膜孔径分布来决定临界尺寸的方法，讨论了这种方法的误差和气体临界尺寸在改善膜性能方面所起到的参照作用．     

减轻或消除超滤膜面浓差极化方法的研究

本文分析了超滤运行中膜面浓差极化形成的机理和危害,并且介绍了几种减轻或消除浓差极化的方法,加紊流促进器则是其中最好的一种.因此,本研究重点放在紊流促进器的试验上,从试验中得到了紊流促进器的最佳尺寸和装有紊流促进器的超滤器的运行条件.在这些条件下,膜的透水率提高了60-80%.该法防止浓差极化有许多优点:安装简单,操作方便,不仅膜的透水率明显增加,而且与其它方法相比耗能低.