唐代节日赋的文化意蕴

唐代是我国岁时节日发展史上的重要时期,丰富多彩的节日活动为文人施展才情提供了机会。与诗歌相比,赋这种文体更加适合描摹节日的盛况与热闹场面,更能体现出大唐盛世的恢宏气度与精神风貌。唐代赋家以辞赋特有的形式,渲染铺张节日典礼仪式与节庆活动场面;在此基础上,为了大一统政权巩固的政治需要,他们还大力赞颂王道之治与帝王之德;不仅如此,他们在对热烈的节日活动的细腻描摹中,还展现出驱疫祈愿、赦罪求福的民俗心理。

钍基熔盐堆材料发展战略

作为第四代核裂变反应堆之一,熔盐堆由于其高的能量转换效率、固有安全性、适合钍燃料的利用等优越性,在世界范围内受到越来越多的关注。熔盐堆主要构件需要在高温、氟化物熔盐腐蚀及中子辐照等极端工作环境下长期稳定、安全有效地工作,因而对其所用材料提出了极大的挑战。本文从熔盐堆工况特点及其对材料的基本需求出发,描述了熔盐堆关键材料(包括合金结构材料及核石墨)的发展历程、现状及存在的问题;特别指出了针对目前实验堆建设阶段需要解决的关键科学技术问题;围绕熔盐堆研发计划,规划了熔盐堆材料未来的发展方向及路线图。

钍基熔盐堆关键材料的辐照损伤研究进展

熔盐堆是第4代核电站的主力堆型之一,也是唯一的液体燃料反应堆,其高温、氟化物熔盐腐蚀及中子辐照等极端环境对其关键材料(包括结构材料以及核石墨材料)的综合性能提出了苛刻的要求。辐照损伤会严重影响材料的机械性能和耐腐蚀性能,是熔盐堆关键材料面临的重要问题之一。从熔盐堆工况特点及其对材料的基本需求出发,综述了熔盐堆关键材料研究进展,并重点介绍了国内外熔盐堆关键候选材料的辐照损伤研究进展,指出了其辐照损伤的研究现状及存在的问题。

Optical absorption of ion irradiated multi-walled carbon nanotube sheets in the visible to terahertz ranges

Optical absorption of Ar and H ion beam irradiated multi-walled carbon nanotube (MWCNT) sheets at various doses in the visible and terahertz spectral ranges was investigated.It was found that the optical absorption of MWCNT sheets in the visible range was decreased with increasing ion irradiation dose.Similar behavior was observed in terahertz range,where the optical absorption of MWCNT sheets in the range of 0 to 1.5 THz was also decreased with increasing ion irradiation dose.The optical absorption decreases in irradiated MWCNT sheets can be ascribed to the increase of defects in the irradiated MWCNTs.

Preparation and characterization of graphene nanoribbons

Graphene nanoribbons(GNRs) have been synthesized by unzipping oxidized multiwalled carbon nanotubes.The thickness of the GNRs synthesized is ranged from mono-layer to four layers.The morphology of prepared GNRs is strongly dependent on structure and defects of the MWCNTs.The synchrotron radiation X-ray diffractions show the d(002) spacing of the GNRs decreases with the increase of the annealing temperature.This may be caused by the removing of water molecules and oxygen-containing functional groups in the GNRs.