Kauramin法加固饱水古木件的机理

利用FT IR、DSC以及形态组织观察等方法,初步探讨了Kauramin(MF树脂)法渗透加固16世纪饱水古船残块(古像木)的过程与机理。结果表明,MF树脂可填充在橡木细胞组织的各层中,与其中的纤维素、木质素等形成大量氢键,高度交联,最终形成网络状整体,从而使古木件的机械性能得以改善。     

赤藓糖醇在考古木材保护中的应用

选取3种不同遗址出土(出水)的考古木材为试验样品,以赤藓糖醇为定形加固材料,在50℃恒温水浴中以不同质量分数的赤藓糖醇溶液对试验样品进行渗透填充,渗透填充结束后采用真空冷冻干燥方式对试验样品进行脱水干燥。分别从尺寸稳定性、环境稳定性、力学性能、显微形貌几个方面考察了赤藓糖醇对考古木材的定形保护效果。试验结果显示赤藓糖醇作为定形加固材料能够对考古木材起到良好的定形保护作用,定形保护效果随赤藓糖醇质量分数的增加而提升,质量分数为30%赤藓糖醇即可显著提升考古木材的尺寸稳定性、环境稳定性和力学性能。赤藓糖醇以晶体形式在考古木材细胞壁上析出,对木材组织起到支撑和加固作用,提高了考古木材的尺寸稳定性和环境稳定性。     

试论古建筑木构架类型在历史演进中的关系

文章对现有的理论模式进行反思, 对中国古建筑木构架的几种类型的在历史演进中的关系提出了假说: 从干栏式到地面的穿斗式是木构架自然的发展序列, 具有普遍性。官式建筑的产生和秦汉以来高等级建筑采用井干式与多层木楼阁有关, 并受到穿斗式的影响。抬梁式是官式建筑发展的结果并反过来影响了南北方的民间建筑。     

Monitoring of Shipwreck Sites

A three-year research project, The Monitoring of Shipwreck Sites (MoSS), was initiated in 2001 as a partnership between several European countries: Finland (project leader), Germany, Holland, United Kingdom, Denmark and Sweden. The aim was to establish a suitable programme for the monitoring, safeguarding and visualizing of shipwreck sites, based on the investigation of three wrecks located in the Baltic and North Seas. Phase I involved the monitoring process, with the investigation of physical, chemical and biological factors that will help to identify potential threats to buried and exposed archaeological material. Phases II and III considered safeguarding and visualizing of shipwreck sites.
© 2005 The Nautical Archaeology Society     

The Mollö Cog Re‐Examined and Re‐Evaluated

As part of a research project on medieval trade and maritime transportation in the former Norwegian province of Bohuslän, western Sweden, a dendrochronological analysis of the so‐called Mollö cog was undertaken. The wreck, which was first salvaged in 1980, was previously dated by ¹⁴C analysis. Since this provided a nearly 400‐year time‐span for the building of the vessel, a more precise dating was considered essential. In conjunction with dendrochronological sampling, several features not previously reported were recorded. This paper presents the find, the research history and the results of the dendrochronological investigation. © 2012 The Authors     

Water,Wind, Wood,and Trees: Interactions,Spatial Variations,Temporal Dynamics,and their Potential Role in River Rehabilitation

Recent Australian research has quantified the role of large wood (wood of any origin and length with a diameter greater than 0.1 m) in dissipating stream energy, forming pool habitats by local bed scour, protecting river banks from erosion, and damming rivers with long rafts causing avulsions. Large wood in Australian streams is sourced by a range of processes from the nearby riparian zone which has usually been degraded by post‐European settlement vegetation clearing. Large wood loadings within the bankfull channel are dependent not only on the type and quality of the riparian plant community but also on bankfull specific stream power, channel width, and the processes of large wood delivery to the stream. While bank erosion and floodplain stripping by catastrophic floods are obvious and important delivery mechanisms, treefall and trunk and branch breakage by strong winds during tropical cyclones and severe storms are also significant in the tropics. Furthermore, wood decay and downstream transport produce temporally dynamic large wood distributions. The longevity of natural large wood structures in rivers, such as rafts, debris dams, and log steps, requires determination. River rehabilitation programs need to not only include the reintroduction of large wood, but also carefully plan the spatial distribution of that wood, the most appropriate type and range of large wood structures, and, most importantly, the revegetation of the riparian zone to ensure a natural long‐term source of large wood. Exotic species management is an essential part of river rehabilitation.     

Investigations on pre-treatment prior to freeze-drying of archaeological pine wood with abnormal shrinkage anisotropy

The current research is aimed at determining the nature of changes in the dimensions and hygroscopicity of archaeological Scots pine (Pinus sylvestris L.) wood after treatment with polyethylene glycols and vacuum freeze-drying. The research was undertaken on mature sapwood with narrow annual rings and a small percentage of latewood. The experimental material used in a comparative assessment is characterised by a considerable degree of wood degradation, but low tangential and radial shrinkage and relatively high longitudinal shrinkage. The waterlogged samples were treated with aqueous solutions of PEG 300 with final concentrations: 8, 12, 16 and 20% (v/v), to which PEG 4000 with final concentration: 15, 20 and 25% (w/v) was added. After freeze-drying and seasoning of samples in the air at RH 30, 40, 50 and 65%, the water content of the samples and the degree of shrinkage of wood in three anatomical directions were determined. The dimensional stability of the samples was also determined on the basis of ASE values at RH 50%.     

饱水古木材难溶盐分析

为研究饱水古木材中难溶盐的成分和分布,基于电感耦合等离子体光谱、X射线衍射以及显微共聚焦激光拉曼等分析手段对出土出水饱水古木材表面和纵向横向不同取样深度的元素含量和分布、表面凝结物以及纵向横向切面颗粒物的物相进行了分析。分析结果表明饱水古木材含有大量的Fe、S和Ca元素,包含这三种元素的凝结物主要由难溶盐和不溶物组成。难溶盐主要分为两大类,一类为钙盐(包括硫酸盐、碳酸盐和磷酸盐等),一类为硫铁化合物(包括硫铁矿、黄铁矿、磁黄铁矿等);不溶物包括各类铁氧化物(如针铁矿、纤铁矿、赤铁矿和水合氧化铁)以及硫单质等。难溶盐分析结果有助于有针对性地对饱水古木材难溶盐尤其是对古木材危害比较大难溶盐进行预防控制和有效脱除。     

Vegetation,land, and wood use at the sites of Bat and Al‐Khashbah in Oman (fourth–third millennium BC)

About 4200 charcoal fragments have been identified from the fourth‐ to third‐millennium BC archaeological sites of Bat and Al‐Khashbah in order to gain an understanding of plant resources available at the sites. Acacia sp., Ziziphus sp., and Tamarix sp. were the main taxa identified at both sites and indicate a similar vegetation composition as today. Phoenix sp. (date palm) charcoal also has been found at both sites. Whereas the cultivation of date palm for the 2700–2300 BC layers from Bat was likely, given other circumstantial evidence (i.e. local cereal cultivation and floodwater irrigation), it is unclear whether date palm was cultivated at Al‐Khashbah. Especially for the older periods (3300–2700 BC) it is possible that nomadic pastoralists were exploiting and/or managing wild date palms. The find of Avicennia marina at Al‐Khashbah indicates long‐distance contacts with the coast.     

江陵天星观一号楚墓出土饱水木漆器F455中细菌对硬松木的腐蚀研究

研究木质文物中的细菌对木材腐蚀性影响,筛选防腐剂抑制腐蚀性强细菌的腐蚀作用,是延长木质文物保存期的一种有效的生物保护措施。为研究饱水木漆器F455及其水环境中细菌的种类,以及对木材的腐蚀程度,采用16S rRNA基因序列分析方法及生理生化试验,对饱水木漆器F455及水环境中细菌进行鉴定,并选取典型菌按5×10~8个/瓶菌量接种马尾松心材(悬于无菌自来水中),37℃培养120d,测试木材的损失率。结果发现,从F455文物挑选的32株细菌中,有29株菌鉴定为芽孢杆菌属(Bacillus),为优势菌属,其余为短杆菌属(Brevibacterium)、短波单胞菌属(Brevundimonas)和产碱杆菌属(Alcaligenes)各1株。水样样品中细菌菌属较F455文物样品中丰富,27株菌有9个属,其中短杆菌属(Brevibacterium)有9株,为优势菌属,其余交替赤细菌属(Altererythrobacter)有5株,短波单胞菌属(Brevundimonas)有4株,产碱杆菌属(Alcaligenes)有3株,黄杆菌属(Flavobacterium)有2株,芽孢杆菌属(Bacillus sp.)、白色杆菌属(Leucobacter)、类芽孢杆菌属(Paenibacillus)、苍白杆菌属(Ochrobactrum)各1株。从2种样品材料的分离菌中共挑选出14株典型菌进行木块腐蚀试验,与对照组比较,其中有9株菌差异极显著。说明这些菌对马尾松木材有一定的腐蚀作用,但是腐蚀率非常低,最高仅1.56%。表明这些细菌对试验木材马尾松腐蚀并不严重。该研究分析了饱水木漆器长期保存在水槽中细菌对木漆器的影响,丰富了饱水木漆器文物生物影响的理论依据。