Identifying a technological style in the making of lime plasters at Teopancazco (Teotihuacan,México)

The aim of this article is to focus on the technology of archeological plasters at Teotihuacan (Central Mexico), from the Classic Period (200–650 A.D.), focusing in the study of Teopancazco, a neighborhood center in the city. Petrographic and chemical analyses by OM, SEM-EDS, and LA-ICP-MS were conducted to characterize samples from different constructive phases and sectors of the neighborhood center, to determine the provenance of the raw materials employed in the manufacturing (e.g., volcanic glass shards) and to assess whether a shift occurred in the manufacturing of plasters and in the procurement strategies of raw materials during the different phases. The results of the analyses show that almost no changes occurred in the making of the plaster during more than four centuries and allow us to consider the presence of a technological style in their manufacture, which is characterized by the making of plaster by mixing lime with volcanic glass shards, which in the case of Teopancazco were derived from the Altotonga (Veracruz) magmatic system. The data at our disposal suggest that this style was developed in Teopancazco and later introduced throughout the city of Teotihuacan in the Early Xolalpan phase (A.D. 350), although we still do not know whether the provenance of the raw materials is the same. The wide distribution of this technological tradition could be due to the technological properties of the materials and/or the influence of the intermediate elite who ruled over Teopancazco. The paper confirms that the study of material culture and technology sheds light on broader cultural aspects of ancient societies.     

Digital Photogrammetry for Documentation of Maritime Heritage

Documentation of maritime heritage is essential for its protection, and for reference in restoration and renovation processes. These functions become problematic in the case of historical ships and boats that lack lines drawings. The purpose of this paper is to describe a procedure for creation of lines drawings based on the shape analysis of surviving historical boats or their small-scale models with the help of reverse engineering (RE) techniques. The paper describes how digital photogrammetry and the iterative method were used to analyze the shape of three historical boats: Tomahawk, Refola and Nada. The application of the proposed procedure produced the lines drawings of the boats as its result. The accuracy of the 3D CAD model obtained with the photogrammetric technique was verified by comparing it against a more accurate 3D model produced with the help of a RE laser scanner. The examination of the resulting lines drawings proves that the digital photogrammetry process and the proposed iterative method are adequate tools for developing lines plans of boat models. The research offers the methodological basis for the creation of an archive of lines drawings of historical boats. Such an archive would provide reference for philologically correct restorations, and permit definition and classification of distinctive elements of various types of historical boats, particularly those produced in the Campania Region.     

Characterisation of archaeological mortars from Pompeii (Campania,Italy) and identification of construction phases by compositional data analysis

This work describes the compositional characterisation of coccciopesto and natural pozzolanic mortars sampled in the Regio VI area of the archaeological site of Pompeii, with particular reference to the Casa di Pansa in Insula 6 and Casa 17 in Insula 2. Samples were studied by optical microscopy and analysed by XRF, SEM-EDS, LA-ICP-MS and XRPD. The XRF and SEM-EDS data, subjected to multivariate analysis (cluster analysis), identified the three main construction phases involved in building the Casa di Pansa. In addition, mineralogical and petrographic characteristics of the aggregate were determined and found to be compatible with pyroclastic deposits from the volcano Vesuvius. Study revealed C–S–H phases in the binder, due to pozzolanic hydration phemomena of hydrated lime with cocciopesto and natural pozzalana.     

Joint geophysical measurements to investigate the Rossano of Vaglio archaeological site (Basilicata Region,Southern Italy)

A high resolution geophysical survey was carried out in the archaeological site of Rossano di Vaglio (Basilicata Region, Southern Italy), where an important ancient sanctuary is located. It was built during the IV century B.C. and devoted to the goddess Mephitis. The sanctuary rises in an area affected by a multiple and retrogressive rototraslational landslide, historically and presently subject to reactivation. The main objective of this work was the identification of buried structures of archaeological interest in an area designated by the Archaeological Superintendence of the Basilicata Region. The study was performed by means of the use of high resolution geophysical surveys. In particular, we made use of the joint application of three highly sensitive and non-invasive geophysical techniques, namely the Geoelectrical, the Magnetic and the Ground Probing Radar (GPR) methodologies. In such a way, we obtained two important results: first, we provided the archaeologists with information about the limits of the areas to be excavated; second, we could verify in real time the reliability of the geophysical results. The experimental results showed four main magnetic anomalies in the area of study, in agreement with the GPR results obtained for the same target. Finally, a partial excavation test of the investigated area revealed a buried building structure, located in correspondence of an anomaly identified by means of the geophysical prospecting.     

‘Life is War’: Informal Transport Workers and Neoliberalism in Tanzania 1998–2009

This article analyses how informal labourers fare under flexible labour markets and economic liberalization, through a case study of transport workers in Dar es Salaam, Tanzania. It highlights the mainstream conceptualization of urban informality as self‐employment and its influence on policy. The article stresses the importance of class differentiation in the Dar es Salaam transport sector and the predominance of informal wage employment, the uneven degree of power commanded by bus owners vis‐à‐vis informal unskilled wage workers and the pernicious consequences of the lack of regulation of the employment relationship on the workforce itself and on society. It then interrogates the criminalization of the workforce and shows how labour over‐supply, its fragmentation and geographical dispersion explain workers’ lack of response to their plight. The longitudinal study of the rise and fall (1998–2005) of a labour association within the sector further highlights the tensions among the workforce and the forms and limits of their solidarity. The conclusion of this study suggests some policy implications.     

The creation of shared space and the definition of a ‘light’ community in Italian television in the 1980s

In the mid-1970s the reform of Italy's radio and television system led to the end of RAI's monopoly and the advent of commercial television stations. This resulted in a reorganisation of the system according to the precepts of daily life and domesticity, with viewers at the centre of the relationship with the medium. This article, by analysing televisual archives such as game shows, explores how television formed part of the changes taking place in society and reveals how it became a kind of meeting-place, coinciding with the rise of an affluent society, between aspirations and desires and stereotypical models dictated by the market. These models were able to express new values that went beyond the boundaries of ideological affiliations and were in effect a response to the search for new forms of identity. In particular, television's place became an open space that was defined through modes of socialisation. It thus constructed a wider intimacy, a ‘mediatised hearth’, that progressively eroded the barriers between the private and the public sphere and led unexpectedly towards a ‘relationship of interest’ between television, competitors, viewers and financial backers. A new community then emerged, characterised more by possessing than by existing.     

The impact of crime on firm entry

The article investigates the effect of crime on firm entry rates in Italian provinces over the period 2007–2016. The extant literature focuses mainly on the relationship between crime and the sorting of new businesses. The present paper contributes to this stream of work by estimating the effect of crime on the overall propensity to engage in entrepreneurial activities across a national territory. We measure the extent to which property and violent crime affect firm entry rates using an instrumental variable approach in which the instrument for criminal activity is the effective abortion rate. Our findings suggest that crime has a negative, sizable impact on firm entry. The results are robust to alternative instrumental variables and firm entry indicators. This empirical exercise emphasizes the need to consider loss of new business activities as a downstream effect when computing the social costs of crime.     

New discoveries in the Piramide Naranjada in Cahuachi (Peru) using satellite,Ground Probing Radar and magnetic investigations

The detection of buried earthen structures by using remote sensing techniques is still an open issue and a strategic challenge as crucial as it is complex. It is crucial because earthen archaeological remains are widely present thoughtout the world (in South America, Asia, Africa) and it is complex due to the subtle physical contrast between earthen remains and the surrounding subsoil.