Can the Raman spectrum of anatase in artwork and archaeology be used for dating purposes? Identification by Raman microscopy of anatase in decorative coatings on Neolithic (Yangshao) pottery from Henan,China

Scanning electron microscopy/energy dispersive X-ray analysis has earlier shown that the white background layer (slip) on painted pottery sherds (Yangshao culture, Henan, China, 4200 BC) is composed of kaolinitic clay containing titanium in the assumed form of TiO₂ at just 1 wt%. The same samples of white slip have now been studied by Raman microscopy, revealing bands characteristic of anatase, but none from the majority species, the matrix of kaolinitic clay. These results highlight the extraordinarily intense Raman scattering from even trace amounts of anatase and thus the need to recognise that, although the colours of archaeological artefacts are almost always determined by the nature of the matrix, the Raman spectrum may be determined by a highly scattering trace component such as anatase. The significance of anatase as a potential date-marker pigment on works of art and archaeological artefacts is discussed.     

Polis—the Portuguese programme on urban environment. A contribution to the discussion on European Urban Policy

In recent years the urban question in the European Union has been a matter of deep focus and intensive debate, contributing to the European Community environmental, spatial and sustainability policies approach, however not entirely reflected in the current version of the 6th European Environmental Action Programme. The POLIS programme, initiated in Portugal at the time of the last Portuguese Presidency of the European Union (January–June 2000), illustrates the Portuguese urban environmental policy approach in that period, in response to contemporary trends and priorities regarding the improvement of urban life and governance. This article describes the POLIS programme, its current status and how it meets current challenges. The expetience acquired so far with the POLIS programme may be useful in the broader context of the discussion of an European urban policy.     

Seismic performance of historical vaulted adobe constructions: a numerical case study from Yazd,Iran

Past earthquakes have demonstrated that historical vaulted adobe buildings are highly vulnerable to seismic actions. Hence, it is crucial for such building typologies to be evaluated in terms of seismic capacity. To this end, this article deals with the seismic performance of historical vaulted adobe houses from the city of Yazd, Iran as one of the seismically active areas of the world and possessing a very rich adobe heritage. Thus, and based on a detailed geometrical survey, a representative sample of adobe houses from Yazd was studied using a simplified in-plane analysis based on three geometric indexes. Concerning the out-of-plane behavior, a deeper assessment was conducted by performing a numerical study, where the main influential parameters on the seismic behavior of vaulted adobe buildings were considered. The numerical analyses were carried out by adopting the limit analysis theory implemented in the Block2D software. The results obtained indicate the safe in-plane behavior of most of the houses and the safe out-of-plane response of the sample under gravitational loads. However, the sample out-of-plane safety under earthquake-induced loads seems to be a matter of concern.     

Technical Strategies for Conservation of Earthen Archaeological Architecture

The preservation of earthen architectural heritage is extremely complex due to the diversity of its constituent materials and potentially rapid physical deterioration. Interventions on historic earthen architecture throughout the world have shown very distinct levels of success, but there is no single procedure or combination of conservation procedures that guarantee success. One of the problems is the lack of knowledge about the behaviour of soil as the material component, and its relationships both with other materials, and associated natural and cultural environments. This article analyses some technical considerations that have influenced the preservation of earthen archaeological remains, through critical analysis of the existing bibliographic references from the proceedings of specialized international conferences that have taken place in the last twenty years.     

Constructive Characteristics and Degradation Condition of Liceu Secondary Schools in Portugal

Within a full-scope modernization program of Portuguese secondary schools, technical inspections were conducted in order to: 1) identify the main degradation processes that affect different types of school buildings, and 2) provide recommendations for the rehabilitation projects. This article presents the constructive characteristics and a statistical analysis of the degradation condition of a particular type of Portuguese secondary schools, the Liceu, comprising a set of buildings with an invaluable historical and cultural importance and that is very iconic in terms of the historical period in which they were built—the Estado Novo. To that end, a database was designed in order to organize information gathered in the inspection of 15 secondary schools of Liceu typology. The aim of the database was to analyze the most frequent anomalies in this type of school buildings, taking into account the constructive solutions used and establishing statistical relationships between anomalies, probable causes and recommended rehabilitation works. Results obtained allowed concluding that the overall condition of these buildings which, in average, were 60 years old, was severe. The most frequent anomalies in both the buildings envelope and interior are mainly due to design and execution errors, water infiltration, and lack of maintenance. Although the school buildings analyzed are to some extent unique, most lessons learned from this study can be extrapolated to other countries, mostly Mediterranean, where during most of the 20th century, buildings were designed and constructed according to the same architectural and constructive principles, and were subjected to the same type of maintenance.     

Making destiny manifest: United States territorial expansion and the dispossession of two Mexican property claims in New Mexico, 1824–1899

In the aftermath of the war of expansion against Mexico, the United States undertook a lengthy adjudication process of Spanish and Mexican property claims throughout the newly acquired territory. In New Mexico, nearly all Spanish and Mexican community land grants were either rejected by U.S. courts or were acquired by commercial interests during a period of intense land speculation. In addition to legal explanations of dispossession, most historical land grant research has emphasized the role of commercial speculators in the dispossession of land grants. The Santa Fe Ring, a loose affiliation of lawyers, politicians, federal and territorial officials and commercial investors, became a potent political and economic force in New Mexico during the 19th century. This article explores the adjudication and speculation histories of two Mexican property claims: the Petaca and Town of Vallecito de Lovato. The dearth of historical knowledge of the practices and tactics of land dispossession in specific New Mexico land grants continues to obscure the full story of U.S. territorial expansion and the history of the transformation in property relations. This article sheds new light on the extent and intensity of commercial speculation and the contribution of those efforts to undermine legitimate claims.     

Exceptional preservation of a prehistoric human brain from Heslington,Yorkshire, UK

Archaeological work in advance of construction at a site on the edge of York, UK, yielded human remains of prehistoric to Romano-British date. Amongst these was a mandible and cranium, the intra-cranial space of which contained shrunken but macroscopically recognizable remains of a brain. Although the distinctive surface morphology of the organ is preserved, little recognizable brain histology survives. Though rare, the survival of brain tissue in otherwise skeletalised human remains from wet burial environments is not unique. A survey of the literature shows that similar brain masses have been previously reported in diverse circumstances. We argue for a greater awareness of these brain masses and for more attention to be paid to their detection and identification in order to improve the reporting rate and to allow a more comprehensive study of this rare archaeological survival.     

Biofilm growth in human skeletal material from ancient Mesopotamia

Investigators have long recognised the effects of microbial activity on archaeological bone. These investigators, however, have focused on single or groups of microbes rather than on complex microbial aggregates such as biofilms, a focus that has affected our understanding of archaeological bone biodeterioration. In this paper, we report on the investigation of a biofilm in archaeological human bone from the site of Tell Leilan, Syria (2900–1900 BCE). Scanning electron microscopy indicated that the biofilm is characterised by single cells and microcolonies of bacteria and fungi, as well as calcite crystals that were all embedded within extracellular polymeric substances. Using culture techniques and DNA sequencing, we isolated and identified several microbes from the biofilm including Amycolatopsis sp., Penicillium chrysogenum, Aspergillus sp., Chaetomium sp., and Cladosporium sp. Having characterised the Leilan biofilm, we are now closer to understanding the complex process of bone biodeterioration in archaeological bone collections.     

The veterans' movement and First World War memory in Portugal (1918–33): between the Republic and Dictatorship

The lack of consensus regarding Portugal's participation in the First World War's European front, combined with the post-war political and economic crisis, highlights the difficulty of integrating a large number of mobilised men, mainly rural workers, who now found themselves unemployed and physically and psychologically traumatised. The return, reaction and insertion of soldiers would configure the social and political milieu in which, in the immediate aftermath of the war, the first images of the conflict were built, based on interactions between veterans and the political authorities, not always on an equal footing. This study will first seek to identify the context and external elements so as to trace a concrete and immediate profile of the veterans. Secondly, it will analyse the creation and intervention of associations – their active social ‘intervention’ – amidst their internal activities and attempts to shape public opinion – actively making demands – in order to influence State policy. Finally, this text will attempt to shed light on the relationship between veterans and contemporary political dynamics, especially keeping in mind the eventual militancy of their actions.     

Celebrating victory on a day of defeat: commemorating the First World War in Portugal, 1918–1933

In Portugal, the development of a memorial project commemorating the First World War, from the treatment of physical bodies to their more or less symbolic (or more or less doctrinal) representations, did not achieve its intended results, in the sense that it did not succeed in consecrating Portugal as a participant of recognized standing and a victorious Allied nation. The memory of the war was clearly shaped by a dimension of tragedy and not by victory. This article will provide, via the dialectics between official and public memory, an in-depth analysis of the politics of memory as it manifests in official commemorative projects. It will examine the forms, pace of implantation and rituals carried out to renew the meaning of memory, as well as the underlying play of forces it is subject to, along with the way in which it establishes cultural and even political rupture or continuity. Through the observation of elements that constitute a war culture – images, language and practices – which emerged during and after the conflict, this study seeks to clarify the First Republic’s successes and failures in delineating and consolidating an official memory of the First World War in Portugal.