司马金龙墓出土木板漆画屏风残片的初步分析

为了解山西大同北魏司马金龙墓出土木板漆画屏风的颜料使用情况和制作工艺信息,利用Micro-Raman、FrlR、XRF、断面切片等技术,对屏风残片上的四种主要颜色(红,黑,黄,白)、红色漆底层、断面分层进行分析与鉴别,结果如下:(1)屏风所使用的颜料有朱砂、炭黑、雌黄、雄黄、石膏.(2)屏风的红色底层系由生漆与朱砂调和、结膜而成,其中可能未曾添加桐油.(3)屏风彩绘部分的颜料分层十分明确,各层的厚度相对均匀,反映出制作者较为高超的绘画技法.(4)在颜料层、木胎与红色漆底层之间的"过渡层"中,分别观察到一些白色物质.初步分析后认为,"过渡层"中白色物质为羟基磷灰石的可能性较大.颜料层中白色物质的成分和物相仍有待进一步的分析.     

Study of interactions between polyethylene glycol and archaeological wood components by C high-resolution solid-state CP-MAS NMR

While use of polyethylene glycols, PEG, polymers for archaeological wood conservation has been well established, there is almost no study of such composite materials with carbon thirteen high-resolution solid-sate NMR. We demonstrate that NMR is an useful analytical tool to characterize rapidly samples of conserved wooden objects. By choosing an appropriate value of the contact time (from 3 to 5 ms) for which the PEG component gives only a small residual NMR signal in the CP-MAS experiment, it is possible to edit selectively the spectra of the wood components. It allows one to visualize the degradation extent of the archaeological wood even when the conservation processes have been already applied. Moreover, by studying the kinetics of CP-MAS experiments, the time constants, T_1ρH and T_CH values for PEG moiety were computed. From these data, it is shown that either in the crude commercial product or in incorporated in archaeological woods, two components are present and they are the signatures of crystalline (or ordered) and amorphous (or disordered) molecular domains. Moreover, it was shown in the archaeological woods that almost 30% of PEG was in close molecular interactions with lignins. This study is the first evidence that the PEG in conserved wood can interact at a molecular level with wood components. It also demonstrates that the PEG diffuses inside the residual cell walls of archaeological wood. This data are important for scientists in charge of process development for the conservation of wooden artifacts.     

太仓万丰村半泾河古船船材主要离子的测试研究

为做好太仓万丰村半泾河古船的脱盐保护工作,本研究检测了半泾河古船的第6、7隔舱板和第8隔舱龙骨及船板下淤泥样品中主要元素和离子的含量,并用电导率仪测量样品在脱盐过程中电导率的变化情况。检测结果表明,木材和淤泥中的主要元素含量高于对照样品,且主要以可溶性盐的状态存在;木材腐蚀程度也与其离子含量有关,腐蚀程度愈严重,样品的离子含量也愈大;经过脱盐处理后,脱盐溶液的电导率值降低至较低水平。测试数据将对今后古船脱盐工作有一定的指导意义。     

The telltale potency of a simple milligram of charcoal found in a hearth left by Mesolithic reindeer hunters in the Norwegian mountains

The discovery and excavation of superimposed, information-rich Pre-Boreal hunting sites around the mountain lakes of Myrvatn and Fløyrlivatn in Southwest Norway have been the subject of archaeological debate. A brief review of research is presented here. In contrast to the well-preserved sites, settlement remains of a diametrically different order occur in the strongly water-eroded zone of the lakeshores: small, surface hearths in almost every stage of preservation, from evident hearths to diffuse and irregular scatters of fire-cracked stones. The latter category seems generally underestimated as a source of evidence. However, recent finds at Myrvatn demonstrate how even blurred, heavily eroded and almost intangible hearth remains, by the support of wood anatomical analysis, radiocarbon dating and intra-site comparison, may reveal concise, invaluable information both about the history of local use and regional landscape development.     

Reburial of shipwrecks in marine sediments: a long-term study on wood degradation

Historical shipwrecks in marine environments are continuously decomposed by wood-degrading organisms, adapted to this specific environment. To protect the wrecks from degradation and to preserve the unique remains for future generations, reburial of wrecks using various covering materials has been suggested as a long-term preservation method. The following experiment was carried out to study the bio-protective effect of sediment. Sound oak, pine, and birch samples were buried above and within marine sediment in Marstrand harbour, and retrieved for analysis after 6, 12, 24, and 36 months. Macroscopic as well as light-microscopic examinations were carried out on each occasion. Marine borers (shipworm, Limnoria), soft rot and tunnelling bacteria were wood degraders immediately above the seabed; soft rot, tunnelling bacteria, and erosion bacteria were active 10 cm below the seabed; erosion bacteria were the only degraders at a depth of 43 cm below the seabed. The wood species had different durability towards the decay agents. After 3 years, wood samples above the seabed were totally decomposed, whereas wood was highly protected at 43 cm depth in sediment. In the sediment, decay decreased significantly with depth of burial. The results suggest that reburial of shipwrecks in marine sediment can be recommended as a simple and efficient method for long-term preservation of the wooden cultural heritage.     

Morphological,chemical and physical changes during charcoalification of wood and its relevance to archaeological contexts

Wood exposed to a heat source can be transformed into charcoal if subject to conditions of carbonisation (in the absence of air) or charring (in restricted air). Charcoal recovered from archaeological sites can yield fundamental information to our understanding of human economic and cultural development over time and (ecological) setting. This work describes the morphological (anatomy, degree of shrinkage), physical (reflectance) and chemical (elemental, molecular composition) properties of charcoal in relation to heat source and wood variables. In this study charcoal and charcoal fuel were experimentally produced whereby temperature (160–1200 °C), time of exposure (2–1440 min), heating rate (high and low) and wood type (angiosperm and conifer) were varied. The results show that charcoal, often described as an inert, black material, has different chemical and physical properties in relation to the investigated variables. By using these different properties it is possible to distinguish between the different types of fires (domestic and industrial) exploited by humans in the past. Morphological analyses and reflectance measurements are effective tools for this purpose and can be used in wood exposed to temperatures of 300 °C and above—temperatures which are relevant to archaeological research. Angiosperm and conifer wood react in different ways when exposed to heat and thus the taxonomic identity of archaeological material needs to be known. Chemical analyses can be used for wood exposed to temperatures below 400 °C whereas elemental analyses of the carbon content can be used for wood exposed to temperatures up to a maximum of 650 °C.     

泗水国出土泡桐材性研究

木质文物出土后环境发生了很大的变化,如不对其进行科学的保护处理就会发生快速的腐朽变化。在选择保护处理方法前对木材的材性进行科学的分析可以为保护方法的确定提供科学的依据。本工作从木材成分、含水率、干缩性、出土泡桐与新鲜泡桐干缩率比较、干燥过程中的电镜分析几个方面对泗水国汉墓出土的泡桐进行了材性研究。结果表明,泗阳汉墓出土的泡桐纤维素和半纤维素的含量比新鲜泡桐的含量下降很多,但木质素的相对含量却增加了,说明泗阳汉墓出土的泡桐在埋藏环境中可能更多地是受到褐腐菌的侵蚀。含水率的高低是反映木材腐蚀度一个重要指标,泗阳汉墓出土的泡桐平均含水率高达1211%,从弦向、径向、横切面的平均收缩率数值来看,出土的泗水国泡桐文物收缩变形很严重,从电子显微镜图片观察,细胞结构各向干缩特性与新鲜木材完全不同。由此可见,不能用常规木材的干缩特征和木材的变化规律来指导泗水国出土泡桐的研究和保护工作,在选择保护处理方法时要结合木材本身的现状选择适合的材料和工艺。     

便携式X射线荧光光谱仪在西藏寺庙木材防腐透入度检测中的应用

木材防腐处理是一项专业性很强的工作,在西藏偏远地区缺乏专业设备的条件下要保证处理效果,需特殊的处理工艺与高效的检测手段。透入度和载药量是衡量木材防腐处理效果的两个重要指标:载药量可通过换算得出结果；透入度一般需要在实验室使用仪器检测。便携式X射线荧光光谱仪的发明使得以前需要在实验室开展的工作可在现场完成,该仪器通过检测木材中防腐剂所含的金属元素确定透入度,具有检测速度快、操作简单的特点。研究结果可为西藏偏远地区寺庙木材防腐防虫处理工程质量控制提供借鉴。     

Fuelling the Fires: The Contribution of Wood Charcoal Analysis to a Landscape Scale Project at and Around Pre-Conquest Iron Age Silchester and a Reflection on Its Wider Implications

ABSTRACT

The contribution of targeted wood charcoal analysis (anthracology) to understanding of the 1st millennium BC Pre-Conquest Late Iron Age oppidum and transition to Early Roman town life at Silchester and nearby late prehistoric hinterland sites investigated by the Silchester Environs project is considered. Attention is given to whether substantive differences in charcoal assemblages of varying size and origin are discernible through time and space, and to their value in elucidating landscape, environment, woodland structure, taphonomy, site function and lifestyles. This paper aims to take stock of the work so far and reflect on what lessons can be learned within and beyond the project. Site-level data are summarised and contrasted for the reader, while full context-level interpretation is published elsewhere [Barnett Forthcoming a. “The Early Roman Wood Charcoal and Waterlogged Wood at Silchester.” In Silchester Insula IX: The Claudio-Neronian occupation of the Iron Age Oppidum. Britannia Monograph Series, edited by M. G. Fulford, A. Clarke, E. Durham, and N. Pankhurst. London: The Society for the Promotion of Roman Studies; and Barnett Forthcoming c Barnett, C. Forthcoming c. “Overview of the Archaeobotanical Evidence.” In Silchester Environs: the Landscape Context of Iron Age Calleva, edited by C. Barnett and M. G. Fulford. Oxford: Oxbow Books monograph due 2020. [Google Scholar]. “Overview of the Archaeobotanical Evidence.” In Silchester Environs: The Landscape Context of Iron Age Calleva, edited by C. Barnett, and M. G. Fulford. Oxford: Oxbow Books monograph].