红茶菌发酵液清洗丝织文物表面结晶盐的应用研究

在我国考古出土的丝织品数量多,种类丰富,但由于墓葬环境的特殊性,如棺液的浸泡等原因,丝织文物的表面形成很多结块,影响了文物的品质。因此,对此类丝织文物的清洗成为文物保护工作的重要一环。为此,本研究以唐代出土丝织文物残片表面的结块为研究对象,利用拉曼光谱和X射线衍射仪检测技术对其表面结块的成分进行分析。结果表明,结晶盐的主要成分为CaSO4.2H2O。本研究针对其结晶盐的成分,再利用显微观察、抗拉强度检测等手段分析了红茶菌发酵液对老化的现代蚕丝影响。在得出没有损伤的基础上,利用红茶菌发酵液中的生物有机酸和生物酶作为生物清洗剂清洗唐代丝织文物残片表面的结晶盐,取得了良好的清洗效果,对丝织文物本身无损伤。     

Botanical,malacological and archaeological zonation of settlement deposits at Gomolava

A 2 × 2 m column was excavated within the large-scale excavation carried out by a Jugoslav team at tell Gomolava, Hrtkovci, Jugoslavia, occupied from Vinc?a (c. 5000 BC) to post-Roman times. The archaeological zonation of the column's material is briefly outlined to provide the background to the detailed palaeobotanical, palynological and malacological study. The results of this study are used to aid the reconstruction of the palaeoenvironment of the tell. They indicate that the earliest agrobotanical zone, in which most of the cultigens were already present, but which is characterized by a very low count of charred seeds, persists throughout the Vinc?a, Baden and most of the Kostolac layers of the tell. A marked increase in charred seeds, without the appearance of new species, occurs in the next zone (Bronze and Iron Age). In zone 3 (Iron Age and Roman), Triticum dicoccum, Triticum aestivum and Lens culinaris attain significant levels.An interesting correlation between an increase in shade-loving snail species (zone B) and increase in building activity in the same level needs to be verified by further similar studies. This level is approximately that of the end of the Vinc?a occupation, but does not precisely correlate with an archaeological transition, suggesting that new building styles may have ante-dated the full development of the Baden cultural group on the site. During the third malaco zone (zone C) most shade loving snail species decrease abruptly to make place for open country species. The spread of these species could have been caused by the partial or total abandonment of the tell. Aquatic snails, which had first appeared in the lowest habitation layers of the tell become rare towards the subsequent bronze and iron age occupation of the tell, indicating that hardly any riverine clay was used for the construction of houses within these periods. The final malaco zone, representing the disturbed iron, roman and medieval periods indicates that again open grassy slopes must have occurred on or around the tell.     

Sampling seeds

Problems of sampling carbonized plant material are discussed. Firstly, the problem of actually selecting a sample in the laboratory is considered, and some experiments which investigate various procedures are described. Secondly, the statistical aspects of determining optimal sample sizes are considered. Formulae are given for calculating optimal sample sizes and confidence intervals. Upper bounds, which are independent of the total population size, are provided for the sample size required to achieve any desired accuracy.     

Identifying past agricultural activity through soil phytolith analysis: a case study from the Hawaiian islands

Soil samples from documented archaeological sites and adjacent fields were analyzed for phytolith assemblage in an effort to identify and reconstruct prehistoric and early historic agricultural systems on the Island of Hawaii. The removal of indigenous tree and shrub vegetation, subsequent agricultural activity, and eventual abandonment of the fields can be identified in the areas tested. The applicability of phytolith analysis to archaeological problems is advanced and areas of strength and weakness identified.     

Sonic Tomography for Masonry Walls Characterization

ABSTRACT

Nowadays, Sonic Pulse Velocity tests (SPV tests) are widely applied for detecting the morphology, hidden defects, and voids within structural elements. This technique, largely applied because non invasive and easy to perform, reveals particularly adapt in the case of ancient buildings, where usually any damage is not tolerated due to the historical preservation requirements. Moreover, recently the SPV tests have been also applied with tomography technology to obtain images of sonic speeds from which it is possible to rapidly reconstruct the internal elements morphology.

In this article, the results of some SPV tomographies regarding masonry elements are presented. The tests are carried out with the aim of establishing consistency and accuracy of this technique in determining the morphology of the investigated elements. The influence of investigation points number and noise smoothing is taken into account, too. At first, the results of a tomography derived from synthetic data of an ideal section are shown. Then, the SPV tomographies of some masonry specimens and of elements sections of a real case study are illustrated and compared among them.     

制备方法对土遗址重塑样稳定性的影响研究

土建筑遗址本体的保护受遗址土的物理、水理、力学及所处环境差异的影响，重塑样是替代土遗址测试其各种性质的重要手段，重塑样拌制土性质的稳定性是科学评价、对比分析试验研究的基础和前提。本研究基于不同拌制土的方法，通过观察、拍照、量取土团粒大小以及同条件制备样品的无侧限抗压强度等，综合评价不同拌制土方法的影响条件。研究发现，采用人工拌土、闷土时间在24 h的土所制的试样最具稳定性，随着闷土时间再增加，土样强度在逐渐降低。本研究为土建筑遗址室内试验研究和工程现场拌制土料提供理论参考和技术支撑。