基于三维扫描模型的兵马俑足踝有限元分析

利用三维扫描技术获取兵马俑残片的三维点云数据,结合Geomagic Studio和Hypermesh建立高精度的兵马俑足踝残片三维实体网格模型。通过基于ABAQUS的重力作用下的有限元分析,研究足踝部分的Von Mises应力和变形特征,以确定足踝处的受力薄弱部位。为进一步探究模型各残片的最佳点云简化比例,采用点云简化模型进行相同工况的有限元分析,以验证点云简化的可靠性。结果表明:结构在重力作用下可保持安全稳定的状态,相对薄弱部位位于左腿足踝处;对于大部分残片,其最佳简化比例在60%～70%,简化后可有效缩短模型实体化处理时间;采用简化模型得到的有限元结果,其最大Mises应力相比于原始模型的误差小于15%,且应力云图和变形图形状接近,模型简化具有可靠性。     

What can pollen grains from the Terracotta Army tell us?

The provenance of more than 2200-year-old terracotta warriors and horses in the Qin Shihuang Mausoleum is still a mystery, even though some researchers have inferred that the terracotta figures were produced near the mausoleum. The sporomorphs (pollen and spores) extracted from terracotta fragments of a warrior and a horse and compared with those obtained from soil samples from the Qin Dynasty layer in Pit No. 2 of the Qin Shihuang Mausoleum indicate that the pollen spectrum from the terracotta horse is different from that of the warrior, but similar to the local soil samples. Herbaceous pollen was dominant in the warrior sample, while arboreal pollen predominates in the horse and soil samples. Palynological evidence suggests that the terracotta horses were produced at a locality near the mausoleum, while the warrior came from a site which was further afield.     

"天高皇帝近":一个重要的中国思想史命题——雷戈《秦汉之际的政治思想与皇权主义》评介

雷戈所著《秦汉之际的政治思想与皇权主义》一书,认为从秦朝到汉初的思想史发展阶段是中国思想史上皇权主义意识形态的生成和确立时期,并将其概括为"后战国时代";采用独特的"历史-思想"研究法,从政治制度、官场规则和官吏的政治生活中,挖掘特定时期的政治思想共识,为政治思想史研究开辟了新的路径,并扩大了思想史的资料范围;认为秦汉时期生成的皇权主义秩序,把"天高皇帝远"的制度现实变为"天高皇帝近"的观念实存,实现了对人们思想的可控性,从此,思想成为皇权可以控制和规范的领域,达到了有效的思想专制。这是秦汉以降中国思想史发展的基本特征。该书在研究方法的创新和思想深度的开掘上,都做出了独到的贡献。     

The Use of Menthol as Temporary Consolidant in the Excavation of Qin Shihuang's Terracotta Army

Temporary consolidation is widely used to protect delicate artefacts or other fragile relics in art conservation. Although cyclododecane is extensively accepted, the safety‐related issues have become an increasing concern and its short working time is always annoying. Inspired by its low melting point, polar structure, well‐established safety profile, easy local availability and low cost, we propose menthol as a new temporary consolidant on the new excavation site of Qin Shihuang's Terracotta Army. In this paper, we offer a preliminarily exploration of the kinetics of menthol sublimation on two different matrices, its residue after volatilization, its penetrability and distribution in simulated terracotta samples, as well as other important properties in the laboratory. The results obtained from these tests reveal that the sublimation of menthol can be a zero‐ or a first‐order process, depending on the porosity of the matrices, and its best operational temperature resides in the range of 60–80°C. Finally, two field cases at the archaeological site of Qin Shihuang's Terracotta Army are presented to show that menthol is a very effective temporary consolidant.     

从秦府集团成员仕进状况看区域文化合流

本文结合南北朝至隋末区域文化合流的背景,考察隋末唐初秦府集团成员的仕进状况,其中包括人才类型、家庭政治背景、个体政治势力来源、进入秦府的渠道、个体政治活动空间,认识了以李世民为核心的秦府政治集团,利用争夺天下之机,逐步拓展政治空间,将各地各类精英人才吸纳到秦府集团里来。在此过程中,李世民集团有意识地编织原北周、北齐、南陈入杨隋政治势力后裔,并用关陇、山东、江左这三大政治文化区域人才所长,将他们化入到同一个文化熔炉里融冶,大大推进了区域文化合流的步伐,在中华民族文化融合史上写下了崭新的篇章。     

云梦秦律新解(六则)

本文对云梦睡虎地秦墓出土的秦律文献中六处简文提出不同于睡虎地秦简整理小组注译的解读意见,重新探讨秦人的立法意图,寻求揭示秦法制相关内容的历史真实。     

《巩昌分属图说》初探

《巩昌分属图说》是一套彩绘的中国传统山水画式舆图及图说,为研究明代西北边防的重要图籍。笔者主要结合历史文献,从历史地理角度对舆图绘制的时间、背景、内容作了梳理和考证。     

“中国里耶古城·秦简与秦文化国际学术研讨会”纪要

里耶古城遗址位于湖南省湘西自治州龙山县里耶镇东北部,东临酉水,最初发现于1996年。2002年起,为配合碗米坡水电站建设,湖南省文物考古研究所会同州、县文物部门,对里耶古城及相关的古遗址、古墓葬     

The digital restoration of painted patterns on the No. 2 Qin bronze chariot based on hyperspectral imaging

The No. 2 Qin bronze chariot unearthed from Qinshihuang's Mausoleum is world famous for its huge size and colourful painted patterns. However, since it had been buried for a long time and was affected by its harsh environment, its painted patterns have been severely damaged. The traditional restoration methods, which mainly rely on expert experience, are manual, inefficient and lack scientific support. Moreover, to protect the important cultural relics, any invasive operations, such as sampling analysis, are strictly prohibited. This paper presents a method that combines hyperspectral imaging and computer technology for the digital virtual restoration of the bronze chariot's patterns. It is non-destructive, more efficient and more scientific. The method reproduces the damaged patterns with the following approaches: restoring the missing edges of the patterns; and distinguishing the different pigments. The obtained result implies that the method can digitally reproduce some of the damaged patterns, and that it can be used as a reference for recreating the patterns of the other painted bronze.     

彩绘回贴技术在秦代高级军吏俑保护修复中的应用

秦俑一号坑新出土一件高级军吏俑(俗称"将军俑"),发现该俑彩绘病害复杂。彩绘脱落严重、泥土附着物面积过大、部分彩绘层已剥离陶俑本体并附着于背部土层上、土层厚重且严重开裂、移位,必须进行保护修复。针对这种复杂的彩绘病害情况,先期进行彩绘分析,根据分析的结果,进行局部回贴试验。在小面积彩绘回贴技术成功的基础上,通过准确定位将残存于土块上的彩绘花纹图案回贴于原位,进行大面积彩绘回贴保护,效果良好。本研究结果可为以后出土的陶质彩绘文物回贴技术提供参考和借鉴。