Subjects: Library Science，Information Science >> Library Science submitted time 2023-10-08 Cooperative journals: 《知识管理论坛》
Abstract： [Purpose/significance] The purpose of this paper is to provide a reference for the subject construction and the library information resources allocation of the domestic aviation colleges. [Method/ process] In this study, we analyze the subject characteristics of domestic aviation colleges through extracting literature subject classification codes in EI journal papers of aviation colleges, using word frequency statistics, word co-occurrence analysis method and social network analysis method. Besides, the Pearson correlation coefficiency was introduced, and the characteristics of interdisciplinary integration of aviation colleges under the condition of strong related disciplines were obtained by the central feature of the network map. [Result/ conclusion] The result shows that the subject characteristics of domestic aviation colleges appear the longtail distribution and the Pareto law. The subject association forms four subgroups and six categories in the knowledge co-occurrence map.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract：为了探究磺化聚苯醚}SPPO)用于质子交换膜燃料电池(}PEMFOs)的性质，我们研究了SPPO膜内部水和水合氢离子的分子扩散特性。构建含水量不同的SPPO膜的分子结构模型，采用分子动力学(IVID)研究了平衡态模型的静态结构，发现元胞的密度随着含水量的增加而降低;同时通过分析径向分布函数(RDF)，发现在SPPO链上的磺酸根上的硫原子周围有水分子聚集，起到吸水和传导的作用，水合氢离子也更趋向于聚集在磺酸根附近。通过对分子运动轨迹的分析，计算了水和水合氢离子在SPPO膜内的扩散系数D和电导率。，研究结果表明，SPPO膜的电导率随着膜内水含量的增加而增加，得到了与实验符合较好的结果。
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