汉代铸钱夹砂陶背范的分析研究

与汉代铸钱相关的遗物中,铸钱夹砂陶背范出土数量最多,是由泥质面层与夹砂背层组成。为了揭示铸钱夹砂陶背范的制作工艺并探讨陶范多次使用的可能性及夹砂层的作用,对陕西西安窝头寨汉代铸钱遗址出土的铸钱夹砂陶背范进行分析研究。结果表明,泥质面层采用细泥料制作,其作用是保证所铸造的金属钱币具有优良的表面质量;夹砂背层是在制范泥料中掺杂了较多的肉眼可见的砂砾,其作用是提高陶范的机械性能,减小陶范受热后的变形,有利于它与金属范合范铸钱。铸钱夹砂陶背范的制作过程是:先制作夹砂层,然后在夹砂层上制作细泥层,在细泥层上印制钱币的背郭型腔,与金属范组成铸型铸造钱币。证实夹砂层可以重复使用,当泥质面层损坏后可以除掉表面的细泥层或直接在原型腔面上另加一层细泥重新制作背郭型腔,再次进行钱币的铸造,夹砂层可以一直使用到被损坏为止,从而极大地提高了铸钱效率。     

山东寿光机械林场东周盐业遗址发掘简报

2017年,山东寿光机械林场遗址Ⅰ区、Ⅲ区共清理各类遗迹30余处,包括灰坑、盐井和盐灶等。出土器物有圜底瓮、鬲、豆、盆、罐、瓦等,绝大部分为残片,以圜底瓮残片为大宗,器物年代集中于战国早中期。初步判断该遗址为战国时期一处煮盐作坊。     

X射线成像技术在文物保护与制作工艺研究中的应用

X射线成像技术在科技考古和文物保护研究领域的应用越来越广泛,可提供肉眼和其他分析仪器无法提供的信息。本文主要以金属文物和铸铜陶范为例,解析了X射线成像技术在实验室微发掘、文物状况研究以及文物制作工艺研究中所发挥的作用。研究结果揭示了大英博物馆收藏的一些重要中国青铜器(包括著名的康侯簋、邢侯簋、赵孟壶)不为人知的修复历史和现状以及复杂器物不同部件的制作工序和连接方式等,并首次披露了侯马陶范的复杂结构。X射线成像技术包括X射线探伤和工业X射线计算机断层扫描(X-CT),是科技考古和文物保护研究的一个重要手段,可为文物保护和保存提供建设性建议,为文物制作技术的解析提供重要的科学数据,为深入研究文物提供指导。     

论“苏州片”失蜡铸造工艺的特色及其价值

"苏州片"是我国传统失蜡铸造的代表性工艺,以其法制作的仿古铜器,以精绝、乱真闻名于世,研究者与苏州艺人经数年的密切合作,成功复原此工艺。"苏州片"仿古铜器工艺蜡料配方独特、制范技艺考究、制作过程精细缜密,不仅具有历史人文价值,而且具有一定的经济、科技价值。传统手工艺要揭示其科学内涵,保护传承的同时注重创新,紧跟时代特色,走向产业化,才能在现代社会赢得生存空间。     

Glass and metal analyses of gold leaf tesserae from 1st to 9th century mosaics. A contribution to technological and chronological knowledge

An archaeometric study was carried out on 40 gold leaf tesserae from mosaics in Italy dated 1st to the 9th century AD. Glass layers and gold leaf were both analysed by X-ray microanalysis. The main aim was the identification of the composition of the glass and of the gold leaf, in order to assess the variations in composition and nature of the tesserae in the examined period.     

临水窑白底黑花瓷器的工艺演变

临水窑是磁州窑系中重要的窑口,在中国古代北方窑业发展和演变的历史上,有着举足轻重的地位。本文较为系统地分析了宋代、金代、元代时期临水窑白底黑(褐)花样品的物理性质、显微结构、化学成分等信息,探讨了临水窑宋、金、元白底黑花瓷器的工艺特点及其演变规律。结果表明:临水窑各年代白底釉下彩绘样品在胎与釉之间均施有化妆土;同时宋金时期样品化妆土的厚度整体略高于元代样品,且厚度相对均匀;成分分析表明,临水窑样品化妆土具有高K低Na特点,而不同年代的化妆土成分略有变化。总体说来,宋金时期的烧制工艺高于元代。     

云南祥云县检村石棺墓出土铜器的初步研究

为研究滇西地区青铜文化及相关铜器的制作技术,本研究采用扫描电镜和金相分析的方法,对云南祥云检村石棺墓出土的17件样品进行取样分析,结果表明祥云检村石棺墓出土的铜器以红铜为主,少数为Cu-Sn合金。这些器物的制作工艺主要是铸造、铸后冷加工等,制作工艺相对单一。3件编钟均为Cu-Sn合金,并且锡成分具有等比递增的现象。兵器矛经过鉴定后说明由于墓主身份的不同,随葬的矛也有实用器和随葬器两类。农具锸和工具锥和凿的鉴定表明有冷加工或使用过的痕迹,可能曾是实用器;而农具锄经鉴定并没有在农作中使用过,仅作为随葬品,进一步证明随葬铜锄是青铜时代滇西地区的一种丧葬习俗。分析表明,当时已根据不同器物的用途进行了不同的制作和加工。本研究结果对研究滇西青铜文化及金属技术有一定的意义。     

The palaeo-Christian glass mosaic of St. Prosdocimus (Padova,Italy): archaeometric characterisation of tesserae with antimony- or phosphorus-based opacifiers

The present paper reports the results of archaeometric characterisation of the opaque tesserae, intentionally coloured with antimony- or phosphorus-based opacifiers, coming from one of the two only palaeo-Christian glass mosaics known in the Veneto region (Italy), i.e., the mosaic which decorated the votive chapel of St. Prosdocimus in Padova. In particular, 55 tesserae belonging to glass types “White”, “Blue”, “Yellow”, “Green” and “Brown” are examined here. The multi-methodological approach (SEM-EDS, EMPA, XRPD, imaging spectroscopy coupled, in some cases, with XAS) gave valuable insights into the complexities of palaeo-Christian glass mosaic production technologies. Two main groups are identified, one characterised by glassy matrixes and opacifiers (calcium or lead antimonate) typical of the Roman period and comprising all “White”, “Blue”, and “Yellow” tesserae and some “Green” ones, and the other characterised by glassy matrixes and an opacifier (calcium phosphate) typical of the 6th century AD, composed of “Green” and “Brown” tesserae. This suggests that, during that century there was a gradual change from older to “new” production technologies: although new opacifiers such as calcium phosphate started to be used, the frequent use of antimony-based ones (43/55 samples) supports the hypothesis that their systematic use was extended until the 6th century, although re-using old tesserae cannot be completely excluded. In addition, comparisons with compositional groups already identified in the “gold” tesserae of the same mosaic and tesserae from Ravenna demonstrate that both the same “base compositions” of the glass were used to produce transparent and opaque glass. This evidence, coupled with the results of the historical-artistic study, suggests technological connections between Padova and Ravenna, the capital of Byzantine mosaics in Italy. Micro-structural observations and chemical analyses of the Paduan antimony-based opacified glass demonstrate that different processes and raw materials were used in their production. Both in situ and ex situ crystallisation can be identified for calcium and lead antimonate in Paduan tesserae, whereas the production of tesserae opacified with calcium phosphate generally appears to be highly standardised. Although the opacifiers used in the Paduan tesserae support technological transitions, the colouring elements identified here, i.e., iron and manganese for white, yellow, brown and some green tesserae, cobalt for blue, and copper for blue and green, suggest continuity, because their use is widely testified in the production of both transparent and opaque glass artefacts dating from the Bronze Age until Medieval times, from whichever archaeological site the samples come. Peculiar relationships among the oxidation states of colouring elements, their contents in the glassy matrix, the types of opacifiers used, and the final colour of tesserae were identified. In addition, the correlations of cobalt and/or copper with other elements, together with identification of relics of colouring and “metallic” droplets, allow us to speculate on possible sources and production technologies. Lastly, identification of newly formed crystalline inclusions in tesserae also yields information on kiln temperatures, which ranged between 900 and 1150 °C, a range easily reached in the furnaces of the 6th century AD.     

SEGMENTAL CROSS-SPECTRUM AS A NEW TECHNIQUE IN SITE RESPONSE ESTIMATION USING SPECTRAL RATIO ANALYSIS

Different aspects of spectral analysis for site response evaluation are investigated in this study. The segmental cross-spectrum is proposed in spectral analysis of earthquake ground motions. The performance of segmental cross-spectrum in contrast with the conventional methods is investigated through the mathematical modelling, numerical analysis and application to earthquake data recorded at Chiba and Shinfuji downhole arrays in Japan. In analysis of earthquake data, the soil amplification function is identified using both uphole/downhole (U/D) and H/V spectral ratios. The advantage of seg-mental cross-spectrum is assessed by comparing identified amplification functions using different spectral methods and theoretical soil response. The reliability of site response estimations obtained by H/V spectral ratio using segmental cross- and Fourier spectra is also examined by means of cross-validation with the U/D spectral ratio of earthquake motion and theoretical soil response. Furthermore, the application of segmental cross-spectrum in nonlinear soil response is examined by comparing the amplification function of weak and strong motions for both methods. The results validate the advantage of segmental cross-spectrum in both linear and nonlinear soil response, particularly, when it used with H/V technique.