Dendrochronological Dating and Provenancing of Timbers from the Arade 1 Shipwreck,Portugal

As part of a larger project promoting the development of historical dendrochronology in the Iberian Peninsula, ship‐timbers from the Arade 1 wreck (mostly planking and framing elements), stored at the DANS/IGESPAR in Lisbon, were examined. Of these, 52 samples were identified as deciduous oak (Quercus subg. quercus) and two as chestnut (Castanea sativa). Of 24 timbers selected for dendrochronological research, 23 could be dated, placing the origin of the wood in western France and the felling of trees between AD 1579 and 1583. Their homogeneity suggests they are part of the original construction, which probably took place shortly after AD 1583. © 2012 The Authors     

田螺山遗址出土古菱角实验室保护方法初探

为探讨余姚田螺山遗址出土古菱角的实验室保护方法,选用PEG 4000法、山梨醇法、乙醇-十八醇法对其进行试验,并以空白样品为参照,分别对不同方法处理后的古菱角样品进行多方面分析,以选取保护效果最佳的处理方法。经过处理的古菱角尺寸干缩率明显下降,基本密度大幅提高,菱壳强度增加,并能保持成分基本不变。切片显微观察表明,加固材料的填充能有效支撑菱壳的细胞壁,使古菱角保持稳定的状态。乙醇-十八醇法通过乙醇置换脱水后在水浴加热的条件下使十八醇渗透菱角进行加固,处理后的样品表面色泽与冻干的空白样品最为接近,且久置后状态稳定,在三种方案中最佳。