摘要：The effects of cation ordering and surface compensating anions on the magnetic structure and catalytic properties of unilamellar Ni-Fe hydroxide nanosheets are studied by using the density functional theory （DFT） plus U method. Fe-segregation in the nanosheets yields magnetic domains with different spin alignments, while the surface compensating anions affect the local moments and valence states of the Fe atoms. The two conditions do not radically change the super-exchange nature of interactions between the paramagnetic metal centers, hut facilitate the formation of various magnetic superlattices in the nanosheets. The calculated free energy change of the intermediates shows that the most stable magnetic structure of Ni-Fe hydrox- ide nanosheets exhibits superior catalytic activity towards oxygen reduction/evolution reactions, which is indicative of magnetic catalyst. This is due to the cycle transition between Fe2＋ and Fe~~ ions in the reactions, which determines the sequence of cleavage of the O-H bond and the release of the OH group, controlling the rate-limiting steps of the reaction. The relationship of magnetism and catalytic activity of Ni-Fe hydroxide nanosheets is established by the valence state change of the Fe ions, which will be helpful to open the way for the design of hydroxide/layered double hydroxides （LDHs）-based magnetic catalysts.

摘要：对广西壮剧的三大流派--师公戏、南路壮剧和北路壮剧进行历史溯源,并介绍其各自的声腔、身段等艺术特征;结合对国家级壮剧传承人张琴音老师等戏曲艺术家的采访,探讨广西壮剧在传承和发展过程中出现的“歌剧化”现象,运用传播学理论对现代壮剧的传播和革新提出建议,使更多的人意识到保护和传承我国非物质文化遗产的必要性。

摘要：安全壳结构是核电站的一道重要安全屏障,其在施工期和后续使用期间的安全性备受关注。通过商业有限元软件ABAQUS建立安全壳结构模型(缩尺比例1∶3)研究在自重、混凝土收缩、预应力以及设计基准内压等荷载作用下安全壳的应力发展、变形情况以及开裂行为。计算结果表明,混凝土的收缩会使得受到约束的壳体底部大体积混凝土开裂。施加预应力后,孔洞周围混凝土会产生裂缝。在基准内压荷载作用下,部分裂缝会进一步扩展和延伸,但其他主体结构部分并未开裂。预应力钢筋的Von Mises应力有所增加,但并未达到钢材的屈服强度。研究结果可用于指导现有核电站的设计和施工。

摘要：新冠肺炎(COVID-19)发生,武汉市水务集团有限公司(简称武水集团)紧急启动战时应急保障机制,采取多种应急措施,保障了所辖城市污水处理厂、污水泵站和管网的安全、稳定运行。同时发现了污水处理厂药剂种类过多、储备困难、自动化程度有待提高、在线仪表安装不足等问题,尤其是污水处理厂建设时留下的"硬伤"给应急保障带来的影响。提出了下一步研究和改进的方向,为提升污水处理行业应对类似突发公共卫生事件的应急保障能力提供借鉴。