聚醋酸乙烯酯乳液的表征、性能及其在彩绘类文物保护中的应用

聚醋酸乙烯酯(PVAc)乳液是常见的彩绘类文物保护材料。采用激光粒度仪、热重/差热分析、红外光谱、X-射线衍射、扫描电镜、透射电镜等表征了PVAc乳液的粒径以及胶膜的热稳定性、结构和形貌;采用粘度计、表面张力仪、pH计、电导率仪等研究了乳液浓度与其粘度、表面张力、pH、电导率的关系;通过冻融、室温-高温放置、离心分离研究了乳液的稳定性;同时用PVAc乳液对模拟起甲和酥碱的壁画进行了修复。结果表明,PVAc乳液粒径呈双峰分布,小粒子的平均粒径为380 nm,大粒子的平均粒径为5.85μm;乳液胶膜为非结晶物质,胶膜热重的最终质量残留为1.54%,335℃出现放热峰。PVAc乳液的电导率随浓度的增大而增大,pH随浓度的增大而下降;相同温度下表面张力随浓度的增大而基本呈现低浓度下降,高浓度上升的趋势。相同浓度下,表面张力随温度升高而无显著变化,表明PVAc乳液的表面张力受温度变化影响不大。相同温度下,乳液粘度随浓度的增大而增大;相同浓度下,乳液的粘度随温度的升高而降低。冻融、离心分离和不同温度下静置发现,该乳液出现分层。用该乳液对模拟起甲和酥碱壁画修复后,再分别老化20个循环和12个循环,发现颜料层再次空鼓、起甲。综合分析,说明实验中所使用的该种PVAc稳定性和抗老化能力较弱,在修复彩绘类文物中应慎重选择PVAc的种类,综合考虑PVAc的使用浓度、环境因素对其性能的影响,以达到最佳使用效果。     

‘Lived bodies’ and the neoliberal city – a case study of vulnerability in London

This article explores the ‘more-than-work’ aspects of the lives of vulnerable women who street-sex work. Particularly, we are interested in the differences between the women’s experiences, within the broader context of power structures as manifested in neoliberal cities. Few studies have explored this aspect of street-sex workers’ lives and theorisations of the co-creation of environments tend to elide the experiences of the most vulnerable people. Specifically, we explore the relationships that these women have with two environments: the quotidian (where they undertake routine everyday activities), and the gentrified (relating to changes in the spaces in which they live and work). We find that their experiences are extremely local, and heavily contingent on the services made available to them (or not) by the statutory and third sectors, and the emotional contacts they make, particularly in third sector support services. This challenges some of the literature which suggests a separation of ‘home’ and ‘work’, and which finds close associations between women who street-sex work. While places designed by the third sector are more responsive to these women, they are also more vulnerable to closure through lack of funding. This contributes to a significant degree of ontological non-linearity and ontological insecurity in these women’s lives.     

Growing up in a tourist destination: negotiating space,identity and belonging

There is little research on children’s experiences of growing up in a popular tourist destination, where place and space are contested with visitors, migrants and temporary residents. Existing literature on young people’s experiences of their socio-spatial surroundings has focused predominantly on the rural/urban dichotomy, often neglecting to explore how identity and belonging are negotiated in complex community contexts such as tourist destinations. This paper reports on recent research that suggests that young people’s experiences of growing up in such an environment are nuanced and diverse, with their rich narratives disrupting socially constructed distinctions between the rural and the urban, merging experiences from both worlds.     

“There are mentalities that need changing”: Constructing personhood,formulating citizenship,and performing subjectivities on a settler colonial frontier

Settler colonial nations are sites of legal pluralism in which encounters between differing constructions of citizenship are formulated. These can involve customary, differentiated, and universal modes of citizenship. But the relationships amongst these are problematic, as are the ways they play out in the performance of subjectivities. To understand these dynamics, we need to think about ideas of personhood that are at their root. Based on research in Nunavik, this article focuses on how, through wildlife management, notions of personhood are being legally codified, particularly in relation to property. It examines the degree to which official ideas of personhood coincide with Indigenous ones in the construction of citizenship, and considers how these combine with property relations in the performance of subjectivities. Enforcing state wildlife regulations has altered the moral codes that define what persons are and determine how they should interact with one another. This research underscores the contradictions that arise as a result of codifying notions of personhood and citizenship in the context of settler colonialism.     

Making a homeland,constructing a diaspora: The case of Taglit-Birthright Israel

The study of diaspora policies in political science, international relations, and political geography has moved away from conceiving diasporas as bounded entities to conceptualizing diasporas as a process to be made. One body of literature maps different strategies employed to bond diasporas to their country of origin, while another body of literature pays specific attention to diasporic identities and the ways such identities are reproduced and constructed abroad. This article seeks to bring these two literatures together by focusing on homeland tourism as a diasporization strategy, i.e. the construction, reproduction, and transmission of diasporic identity. Through the case of Taglit-Birthright – a free educational trip to Israel offered to young Jewish adults – the article identifies the specific mechanisms and micro-practices used in order to transform Israeli territory into a Jewish homeland, reproduce the narrative of dispersion, and demarcate group boundaries. Incorporating insights from theories of territorialization and based on the program's educational platform and existing ethnographies of Taglit-Birthright, this article unpacks the notion of the homeland and demonstrates how the homeland itself – as an embodied, affective, and symbolic site – is strategically used in order to cultivate diasporic attachments.     

Urban Sámi Identities in Scandinavia: Hybridities,Ambivalences and Cultural Innovation

One of the most significant social and cultural changes in the northern part of Scandinavia, as in other parts of the world, is urbanization. All over the northern region, towns and cities are growing, and a large portion of the indigenous population now lives in urban areas throughout all Scandinavian countries. Within these multicultural cities, urban Sámi communities are emerging and making claims to the cities. From a situation where migration from a Sámi core area to a city was associated with assimilation, an urban Sámi identity is now in the making. In this article, we discuss what seems to be the emergence of an urban Sámi culture. The article builds on findings from a study of urban Sámi and their expression of identity in three cities with the largest and fastest-growing Sámi populations in the region: Tromsø (Norway), Umeå (Sweden) and Rovaniemi (Finland). A main finding is the increasing recognition of their status as indigenous people and the growth in Sámi institutions in the cities. Another finding is an urban Sámi culture in the making, where new expressions of Sámi identity are given room to grow, but where we also find ambivalences and strong links and identifications to places in the Sámi core districts outside of the cities.     

汉代彩绘的回贴修复研究

针对出土的汉代生漆彩绘和胶料彩绘的破损状况,用自行研制的增塑剂(SC1,主要成分为水性环氧及有机锡),加固剂(水性氟),胶粘剂(环氧树脂与聚酰胺及508的混合物),对生漆彩绘耳杯进行回贴修复;用显现加固剂(508及有机氟材料)对西汉兵马俑胶料彩绘进行显现加固,然后采用水性氟试剂作为胶粘剂进行回贴。两类彩绘的回贴效果理想,说明这种新型的回贴技术可以应用于文物彩绘修复。     

The Saxons within Carolingian Christendom: post-conquest identity in the translationes of Vitus,Pusinna and Liborius

The Franks incorporated Saxony into the Carolingian empire through a long, brutal struggle coupled with forced conversion. When Saxons themselves began to write a few decades afterwards, they had to make sense of this history and of their role and identity in their contemporary Carolingian world. In contrast to the portrayal of Saxons in writers such as Einhard and Rudolf, three ninth-century Saxon accounts of relic translations — those of Vitus, Pusinna and Liborius — reinterpreted history to claim a place for the Saxons as a distinct group equal to the Franks within the populus Christianus under the Carolingian monarchs. As a key part of their literary strategies, these authors attempted to salvage from the story of their defeat and forced Christianisation an account of God's sovereignty, native agency and virtue (especially fidelity) as a foundational element of Saxon identity. These texts prefigure the debates about post-conquest Saxon identity which would underlay the later and better-known Ottonian triumphal self-conceptions. Moreover, the concerns of these authors led them to remarkable hagiographical innovations in grappling with paganism, conversion, miracles, social class and faith.     

The Social Role of Technology in Coastal Alaska

Novel technologies linked to women and men through identity-demarcated tasks and knowledge sets can potentially have differential and even long-term effects on each group. This study follows the trajectory of two significant imports into the coastal western Alaskan system, the firearm and the metal cook pot. These imports had different implications for coastal Yup’ik women and men, young and old. Over time the gun became an integral piece of a man’s tool kit and one that had the potential to boost production and thus a man’s access to status-building. However, these same tools had the potential to undermine the apprenticeship system of male authority. Likewise, the metal cook pot replaced the productive oversight and skill set of elder women’s ceramic production but created paths of independence for younger Yup’ik women. These changes in technology destabilized relative balances of gender and age based status, security, and authority and fashioned new gender and age based social and economic opportunities and limitations.     

The signory and its supporters: the Este of Ferrara

The signory of the Este, like that of other contemporary signori, was officially inaugurated with a public election. The ‘people’ (popolo) of Ferrara thereby instated an hereditary ruler who had absolute powers over the city. This election, together with the fact that there were no successful rebellions against the Este, has led some historians to argue that these signori achieved an implicit understanding with the ‘people’ of Ferrara.The evidence of contemporary chronicles, though often ambigous, does not support this view. Likewise, the legislation of the first Este signore demonstrates a desire to suppress the ‘people’ rather than to co-operate with them. The group whose support was essential to the Este was the nobility; chronicle and archival evidence indicates that the Este considered this group to be the very basis of their signory. The interests of the nobility, as well as the need to maintain good relations with Venice, made far more impact on Estense policy than did the wishes of the ‘people’.