纸质文物的清洗研究—以清代册页清洗为例

清洗是纸质文物保护的重要环节。为此,利用虹吸技术对纸质文物进行清洗,以减轻常规清洗方法对文物本体尤其是绘画颜料层的摩擦及冲击损伤,对脆弱纸张及色彩易脱落的字画尤其适宜。这可避免传统的清洗方法中清洗液循环使用出现的交叉感染及清洗不彻底的现象。清洗后纸张白度提高,光泽度几乎无变化,pH值提高至8.5左右。     

Edge damage distribution at the assemblage level on Middle Stone Age lithics: an image-based GIS approach

Lithic artifacts represent the most abundant cultural remains from Middle Stone Age sites in southern Africa. Of these, pointed forms (under a variety of names), blades, and flakes have long been recognized as the three most abundant general types, and retouch on all three is rare relative to similar forms of equivalent age elsewhere. Here we offer a new technique for documenting concentrations of edge damage on an assemblage level to infer taphonomic processes and to record usewear and retouch. This approach is specifically aimed at patterning on the assemblage scale, rather than on individual artifacts. We use points from a Middle Stone Age assemblage from Pinnacle Point Cave 13B, near Mossel Bay, South Africa, to illustrate the technique. Combining GIS, rose diagrams, and polar statistics, we were able to visually and statistically summarize lithic artifacts for patterns of edge damage. For the points made on quartzite in this assemblage, edge damage was found to be significantly patterned and taphonomic causes of the damage were rejected. The technique also opens avenues for many other quantitative analyses that are either impossible or difficult with current non-visual systems of recording, such as measurements of distance, angle, and area of edge damage.     

LA-ICP-MS analysis of quartzite from the Upper Gunnison Basin,Colorado

We report the results of LA-ICP-MS analysis of 402 quartzite samples representing 48 collection loci in the Upper Gunnison Basin (UGB), Colorado and determine the extent to which the sources can be geochemically discriminated from one another using this non-destructive technique. The ability to differentiate among the sources would open the door to provenance studies of the quartzite chipped-stone tools and debitage that constitute 95% or more of most of the 3000-plus prehistoric site assemblages documented in the UGB. Our samples represent prehistorically quarried and non-quarried quartzite sources, including outcrop (primary) and gravel (secondary) deposits. The results reveal spatial and chronological trends in quartzite elemental composition that can be exploited for provenance determinations of quartzite artifacts from UGB sites, albeit using an assemblage-based sourcing strategy that differs from the familiar approach of “matching” obsidian artifacts to their statistically likeliest geological source. We offer a preliminary version of a sourcing protocol for UGB quartzite.     

Predicting the Seismic Response of Capacity-Designed Structures by Equivalent Linearization

An equivalent linearization procedure is developed for predicting the inelastic deformations and internal forces of capacity-designed structures under earthquake excitations. The procedure employs response spectrum analysis, and mainly consists of the construction of an equivalent linear system by reducing the stiffness of structural members that are expected to respond in the inelastic range. These members are well defined in structures designed with capacity principles. Maximum modal displacement demands of the equivalent linear system are determined either from the equal displacement rule, or from independent nonlinear response history analysis of SDOF systems representing inelastic modes.

Predictions obtained from the proposed equivalent linearization procedure are evaluated comparatively by using the results of nonlinear response history analysis as benchmark, linear elastic response spectrum analysis and conventional pushover analysis. The deformations and capacity controlled actions of a 12-story symmetrical plan concrete frame and a 6-story unsymmetrical plan concrete frame are obtained by each method under 96 strong ground motions. It is observed that the proposed procedure results in better accuracy in estimating the inelastic seismic displacement response parameters and capacity controlled forces than the other two approximate methods.     

甘肃玉门花海西晋墓群出土木牍的保护

甘肃河西地区出土文物特殊的高盐碱埋藏地质环境,造成画像砖、木质文物、丝织品等文物埋藏期间大量盐碱的渗入。文物出土后,随着环境温湿度的变化,使得文物内部盐碱重结晶,直接导致了画像砖画面脱落、木质文物崩裂及丝织品脆化。本工作针对甘肃玉门花海西晋墓群出土木牍的损害状况,进行了表面清理、渗透填充加固、脱盐及对个别器物进行了回软整形等保护,保护处理后状况良好,保护方法对同一地区出土其他木质文物的保护有借鉴作用。     

A Paleolithic Cache at Tolbor (Northern Mongolia)*

This study presents analyses of a unique assemblage of lithic artifacts, 57 large flakes, discovered in the Ikh Tulberiin Gol River valley of Northern Mongolia. The assemblage represents the first Paleolithic cache ever discovered in Mongolia and is an isolated find, not directly associated with a habitation or logistic activity site. Results of use-wear analysis suggest most of the flakes were unused, with only a few minimally used for processing wood. GIS analyses of the local landscape indicate that the placement of the artifacts was likely symbolic, rather than utilitarian or for storage, lying in an east-west linear viewshed of the primary mountain pass to an adjacent river basin. Based on the context of the discovery as an isolated find and technical-typological features of the artifacts, the assemblage is interpreted as a cache of tool blanks that was purposefully and symbolically positioned on the landscape relative to the primary mountain pass by Upper Paleolithic hunter-gatherers.     

Nonlinear Static Procedure for Multi-Story Asymmetric Frame Buildings Considering Bi-Directional Excitation

The present article focuses on a nonlinear static procedure (NSP) for a multi-story asymmetric frame building with regular elevation subjected to bi-directional ground motion. In this procedure, two simplified models—an equivalent single-story model and an equivalent single-degree-of-freedom (SDOF) model—are used to predict the peak response of multi-story asymmetric buildings. The peak response is predicted through pushover analysis of an equivalent single-story model considering the effect of bi-directional excitations and an estimation of the nonlinear response of equivalent SDOF models. The predicted results are compared with the nonlinear dynamic analysis results, and satisfactory predictions can be obtained by the proposed procedure.     

Lipoic acid formulations for the removal of arsenic and mercury from museum artifact materials

Museums currently face a tremendous task of identification, mitigation, and remediation of pesticides from artifacts in order to protect museum workers and the general public. Additionally artifacts are being repatriated by Native American tribes for use in cultural ceremonies which may subject the practitioner to health risks. Arsenic and mercury salts are among the most persistent poisons used and so a critical challenge is removing these hazardous metals without damaging the material composition or decorations of the objects. At this time, there are no feasible procedures that can meet both of these objectives. Reported here is the development of a procedure involving concentrated aqueous reduced lipoic acid solutions for the removal of arsenic and mercury pesticides from substrate materials commonly encountered in museums.     

Cluster analysis of mixed-level data: Pottery provenience as an example

Provenience or “sourcing” studies of archaeological objects most commonly employ quantitative measurements of amounts of chemical constituents in the artifacts and source materials. These are then used in statistical grouping procedures known as cluster analyses. Many additional attributes of artifacts and sources, yielding lower-level qualitative data, are also of potential importance in determinations of artifact origins. These attributes are usually neglected because of the longstanding difficulty in treating “mixed-level” data, that is, combining both qualitative observations and quantitative information in a single powerful statistical procedure. A series of cluster analyses were run on two data sets consisting of archaeological pottery, using mixed-level characterization data in the CLUSTAN program with Gower's coefficient of similarity. The clustering solutions are interpretable in terms of provenience and production strategies.     

A Twenty-First Century Archaeology of Stone Artifacts

Archaeologists today, as in the past, continue to divide their stone artifact assemblages into categories and to give privilege to certain of these categories over others. Retouched tools and particular core forms, for instance, are thought to contain more information than the unretouched flakes and flake fragments. This reflects the assumption that information to be gained from stone artifacts is present within the artifact itself. This study evaluates a continued interest in the final form of stone artifacts by first considering ethnographic accounts of stone artifact manufacture and use in Australia and then by utilizing the patterns observed in these accounts to investigate assemblage patterning within an Australian archaeological case study. Reading the ethnographic accounts provides no indication that Aboriginal people valued more or less complex artifacts, in uniform ways, in every situation. In fact, the opposite is true. Stone artifacts were always valued in some sense but which ones, and in which ways, depended on the situations the people who needed the artifacts found themselves in. Aboriginal people were quite capable of making and using expedient and informal artifacts in complex ways. The significance of these observations is considered for stone artifact studies in general and in relation to a case study from western New South Wales, Australia.     

Chemical Differentiation of Obsidian within the Glass Buttes Complex,Oregon

Two hundred twenty-five source samples from the multi-component obsidian source at Glass Buttes, Oregon were characterized by neutron activation analysis to determine the number of chemical groups present. Seven geochemical groups were found within the Glass Buttes complex. An abbreviated neutron activation analysis procedure previously used to differentiate between obsidian sources in Mesoamerica was also successful in separating obsidian from different outcrops at Glass Buttes. Thirty-one artifacts from the Robins Spring site on Glass Buttes were also analysed. The abbreviated NAA procedure was also successful at assigning the artifacts to the different subsources at Glass Buttes.     

Geochemical impacts to prehistoric iron-rich siliceous artifacts in the nearshore coastal zone

In the Middle Atlantic region of the United States, landscapes drowned by sea level rise contain scores of prehistoric archaeological sites. These sites provide archaeologists with a rare opportunity to investigate various geologic processes. During the transition from a terrestrial to an offshore setting, the materials associated with an archaeological site are exposed to a series of geochemical processes inherent to the formation of tidal marsh. The duration of the geochemical exposure to tidal marsh is largely dependent on the rate of marine transgression. Here we describe the stages associated with the sulfidization and sulfuricization scheme and the impact to iron-rich lithic artifacts from naturally drowned archaeological sites. Sulfidization and sulfuricization should also impact buried archaeological materials as a result of anthropogenic dredge spoil dumping and the creation of man-made tidal marshes along modern coastlines. Our results indicate that the surfaces of an iron-rich artifact, as well as its interior are visually and geochemically altered by prolonged exposure to the anaerobic conditions of a tidal marsh. Not only should researchers be cautious about making lithic material identification on artifacts found within coastal tidal marsh areas, but museum curators should be aware of the damaging impact of long-term aerobic storage. The geochemical tidal marsh scheme that has altered or corroded iron-rich lithic artifacts in the nearshore zone is an expression of a process that has impacted numerous earlier prehistoric sites currently located on the continental shelf or beneath the coastal estuaries around the world.     

Lead isotope analysis as a new method for identifying material culture belonging to the Vázquez de Coronado expedition

Archaeological evidence has become an increasingly important component of efforts to identify the route of the Francisco Vázquez de Coronado expedition through northern Mexico and the southwestern United States (1540-1542). Here, we report the first high-precision lead isotopic measurements of artifacts from two archaeological sites with strong material evidence for the expedition’s presence: Piedras Marcadas Pueblo in New Mexico and the Jimmy Owens Site in Texas. The analysis of lead and copper armaments from both sites reveals that many artifacts have overlapping or extremely similar isotopic ratios. We propose that the narrow range of lead isotopic ratios measured on these artifacts can be interpreted as a geochemical fingerprint for some of the Coronado expedition’s surviving material culture, and provides evidence that we interpret to suggest the expedition derived lead and copper metal from Mexican sources. Such a geochemical fingerprint presents an empirical method for discriminating between artifacts that belonged to the Coronado expedition and those related to subsequent Spanish, historical, or modern activity in the Southwest U.S. Thus, this method could significantly impact the search for and identification of archaeological sites associated with the Coronado expedition.     

谈我国纸质文物保护的科技需求

我国纸质文物数量众多而保护难度较大。纸质文物因其特殊的本体材料、性能,病害原因多样、易于损毁,特别是民国纸质文物损坏现象严重。纸质文物保护需要建立完善的文物数据库和检测体系,以现代科学方法展开劣化机理研究,结合不同地区气候条件,以本国传统产纸技术、修复体系为根基,引入国际先进技术,达到长期、稳定保存纸质文物的目的。     

甘肃出土糟朽木器材质鉴定及特征分析

甘肃木器是反映河西走廊古丝绸之路文化、历史和社会重要的珍贵遗产。武威、高台作为甘肃木器重要的发现地,出土器物不仅类型、风格迥异,而且器物材质形态、结构特征明显,属于典型的糟朽木器类型。研究工作从木材学的角度出发,应用生物切片技术,对出土器物材质树种、特征及特性进行了科学鉴定和剖析。鉴定结果表明,树种类型有:①云杉;②冷杉;③圆柏;④落叶松;⑤胡杨;⑥榆树;⑦香椿;同时采用扫描电镜、X射线衍射分析技术对糟朽木质纤维显微形态、结构进行了观察和分析,分析结果表明:出土糟朽木器木质结构已发生降解、腐变,其材质形态特征及特性会随着后期保存环境及其因素的影响、腐蚀而频繁变化或骤变。最后,分析工作对糟朽木器纤维素结晶度、降解度等相关物理参数进行了实验测定。测定结果表明:出土实物纤维素结晶度约为58%,而纤维降解度达到40%以上。综合以上鉴定结果和实验数据,得出以下结论:①甘肃木器制作材质涉及的树种种类较多,基本以云杉材为主,而青海云杉在祁连山林区分布广泛,为其制作用材提供了丰富的天然材料;②材质糟朽及纤维严重降解是甘肃木器重要的材质特征,表现为纤维(纤维素、半纤维素)含量降低呈现木素含量升高,而木素含量的相对增大,则是导致材质颜色变深的重要原因;③受糟朽器物自身含水率的变化、影响,其材质特征具有脆弱性和不稳定性,而且改变、变化过程通常具有滞后性,导致结果往往是致命的;④纤维素结晶度和纤维降解度是衡量和评估糟朽木器材质健康状况重要的物理参数,二者之间存在关联关系。本研究结果可为糟朽木器形态与结构研究提供科学依据和技术支撑。     

Recent developments in the analysis of lithic artifacts

A review of recent research on lithic technology and functional analysis is presented. Our perception of the state of the art is based on a review of the literature published during the past three years and on the topics that were covered at conferences and workshops on lithic analysis. While the goals have essentially remained the same since the turn of the century, concerns with chronology and the classification of lithic artifacts have given way to studies that treat stone implements as products of a dynamic system of human behavior. In order to understand stone artifacts and the people that made and used them, archaeologists must understand theprocesses involved in the acquisition, production, exchange, and consumption of lithic artifacts. In the past ten years, experimental studies involving the manufacturing and use of stone tools have been integrated with studies of refitted or conjoined lithic artifacts and microwear analysis. The result is a much more dynamic view of the variability in assemblages of lithic artifacts. In this review, we focus on replication and technological analysis of chipped stone artifacts and microwear analysis, and consider the implications of this research.     

Identifying expedient glass tools from a post-contact Tsimshian village using low power (10–100×) magnification

Glass shards from post-contact contexts at the Northern Tsimshian site of Ginakangeek, on the north coast of British Columbia Canada, are identifiable as expedient tool artifacts through analysis of usewear patterns. In this study, we have examined the nature of glass and argued that its mineralogical properties make it analogous to other lithic materials. Although other researchers have found evidence of a lithic-like industry of glass artifacts based on macroscopic features, we have demonstrated that expedient artifacts are identifiable even in the absence of macroscopic traits, through low-power magnification of usewear. We have also tested this thesis against the possibility that microscopic usewear-like patterns were the product of fragmentation or post-depositional effects, and argued that a suite of usewear traits correlates only with use activity. Our experimental suite of glass artifacts indicates that specific actions (such as cutting, scraping, sawing, and chiseling) and the relative hardness of specific substrates produce particular usewear patterns. A number of potential explanations are considered for the appearance of such an industry on the Northwest Coast more than a century after contact with Europeans.     

中国出土玉器病害与修复保护综论

透闪石-阳起石玉器是中国优秀传统文化的杰出代表,其保护传承非常值得关注。本工作将玉器在入土埋藏前人类行为和入土埋藏后自然风化过程的影响作用进行有机结合,对狭义概念的透闪石-阳起石质出土玉器的病害特征、形成机制、修复和保护策略等方面进行了系统梳理。结果显示,出土玉器的病害特征主要包括10种：裂隙、剥落、断裂、残损等4种可因人类行为方式造成;表面污染、表面结壳、孔洞、粉化、复合材料脱落等5种主要由自然受沁作用造成;色变现象可由人类行为方式和自然受沁作用分别或共同造成。出土玉器的修复应遵循最小干预性原则,一般不作处理;存在孔洞严重、粉化、复合材料脱落的玉器,建议加固封护,维持其基本外形。出土玉器的预防性保护需要设置中高湿度条件,展陈时规避紫外光,保藏时使用无酸性材料包装。该项工作旨在将保护和考古工作紧密结合,不仅为玉器保护服务,而且为玉器考古工作服务,进而有助于该类珍贵文化遗产的传承。     

Metallurgical study on some Sasanian silver coins in Sistan Museum

Elemental analyses and microstructural studies of historical metal artifacts provide researchers with invaluable and priceless information about metal extraction technology and the procedure of creating artifacts. In addition, the information is helpful for knowing about the metallurgical processes of the artifacts. This study was conducted by a microscopic examination and elemental analyses of seven Sasanian silver coins preserved in the Sistan Anthropology Museum, Iran. For the purpose of this study, three methods were employed: first, the proton induced X-ray emission microanalysis (micro-PIXE), to determine the main and trace elements of the coins; second, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), to perform elemental analysis to identify impurities of the metal; and third, microstructural analysis of the coins which was carried out with an optical microscope (OM). The elemental analyses identified Ca, Cu, Ag, Au, and Pb in the coins. The high quantity of Ag in samples validated the application of advanced and accurate cupellation technology for refining silver and separating impurities from raw ore. The gold concentration in the coins indicated the use of non-galena ore for silver extraction. Additionally, the microstructural analyses of samples pointed to the application of thermo-mechanical processes on coins.     

Archaeological classification and ethnic groups: A case study from Sudanese Nubia

This is an attempt to discuss the central problem in archaeology, to understand the relationship between the artifacts and the cultural processes which produced them. Classification is our main methodology for the interpretation of this relationship: The problem is, however, to find the significant criteria. The focus of this paper is to show how archaeologists on the basis of classification of artifacts have tried to reconstruct culture history in terms of migration, diffusion or invention. The main example is from Sudanese Nubia. A criticism of the criteria here selected as significant for the identification of people and their movement, is based on a general theoretical discussion of ethnic groups.