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.     

Can Institutional Reforms Reduce Corruption? Economic Theory and Patron–Client Politics in Developing Countries

The ‘anti‐corruption consensus’ of the dominant development paradigm sees corruption as a governance failure and maintains that graft can be reduced or eradicated through appropriate institutional reforms, such as strengthening the judiciary, designing corruption‐proof regulatory regimes, and establishing anti‐corruption agencies. This article aims to cast doubt on the theoretical rationale of this family of anti‐corruption interventions. The neo‐classical paradigm that informs the consensus is based on a set of unsatisfactory idealizations, which undermine the explanatory power of mainstream economic models of corruption. Drawing on insights from economic sociology and anthropology, the article develops an account of the relationship between corruption, cultural norms and patron–client politics in developing countries. This account shows that corruption is embedded in socio‐cultural structures that are endemic to the process of transition to industrial capitalism — a transition that all developing countries are arguably undergoing, however haltingly. This insight clarifies the theoretical limitations of mainstream corruption economics and provides a framework for constructing more empirically adequate explanations of corruption levels in specific countries. It also suggests that substantially reducing, let alone eradicating, corruption in the developing world may not be possible without fundamentally rethinking the existing set of anti‐corruption strategies and techniques.     

Teaching energy geography? It’s complicated

The premise of this essay is that energy geographies are complicated, and this in itself presents some pedagogical difficulties. As someone who wants students to critically examine and confront the complexity of energy systems, it can be frustrating when students react to demonstrate frustration, apathy, or even confusion. In what follows, I will lay out three complications of teaching energy geography: (1) empirical complexity, (2) confronting fossil fuel “embeddedness,” (3) the energy culture fallacy.     

Dynamical Assessment of the Work Conditions of Reinforcement Tie-Rods in Historical Masonry Structures

Tie-rods are essential structural elements, which have been employed for centuries in masonry historical buildings, either during the construction or in successive strengthening interventions, with the aim of containing dangerous horizontal actions. The actual work conditions of these tie-rods, which are strongly influenced by their load history, are difficult to be quantified theoretically, and an effective method for their measure is of great importance in order to ensure the efficiency of these elements during the time and the stability of the entire building. Common measurements are often carried out adopting models based upon significant simplifications, like, for example, hinges at the extremities. These assumptions, rarely represent the real work conditions for anchorages. In this work, a non-destructive testing method is presented, based upon sophisticated dynamical models that can take into consideration many of the circumstances neglected by the simplified models. Four case studies are extensively described, trying to embrace the most common situations in term of peculiar features of the building, structural configuration, and load history. The discussion of the results yields the safety margin of the rod with respect to the material failure and provides important indications about the overall stability of the whole building.     

Making a significant place: excavations at the Late Mesolithic site of Langley’s Lane,Midsomer Norton,Bath and North-East Somerset

Excavations at the site of Langley’s Lane, Bath and North-East Somerset, have revealed an important sequence of Late Mesolithic activity focused around an active tufa spring. The sequence of activity starts off as an aurochs kill and primary butchery site. Culturally appropriate depositional practices occur through the placement of a selection of bone in the wetland of the spring and the digging of pits around the spring margins. The spring at Langley’s Lane continued to be visited and more animal bone and lithic material was placed in the wetland. Finally, visits to the site involved yet more formalized activity in the form of pit digging and the creation of a stone surface. Activities such as these are difficult to locate in the archaeological record and Mesolithic ritual activity rare, making this a site of some significance to studies of Mesolithic NW Europe.     

Plasters from Different Buildings of the Sacred Precinct of Tenochtitlan (Mexico City): Characterization And Provenance

In this work, we present the results of the characterization of 20 lime plaster samples taken from the Sacred Precinct of Tenochtitlan (Mexico City), the ancient capital of the Aztec empire. The samples come from different buildings of this precinct (A, B and D) and from the west façade of phase VI of the Templo Mayor pyramid. The objective of the work is to characterize the plaster samples, to understand the raw materials used, and to evaluate the presence of similarities and differences among the samples in the building techniques and raw materials employed. All the samples were studied with OM, SEM–EDS and LA–ICP–MS. The study provided evidence of the plastering and replastering practice in the same constructive phases. The results of the analyses showed the existence of important similarities and differences among buildings and constructive phases in the Sacred Precinct. In order to understand the provenance of the limestone used in the plasters, the lumps and the binder of the samples were analysed. The results were compared with those of the limestone outcrops located in central Mexico. The provenance study showed that all the limestone used in the construction of the analysed buildings of Tenochtitlan's Sacred Precinct comes from the Tula region.     

Immigrant entrepreneurs,diasporas, and exports

This paper demonstrates the positive effect of immigrant entrepreneurs on manufacturing exports over and above that of diasporas. Using small-scale regional administrative data, our instrumental variable estimates of export gravity models imply that ceteris paribus, that is, holding constant the total number of immigrants, the expected protrade effect of a migrant becoming an entrepreneur amounts to an average increase of US$5,946 in the export flows toward her country of origin. Besides these dyadic effects, immigrant entrepreneurs unlike nonentrepreneurial immigrants raise a region's overall competitiveness and export flows toward other destinations as well.     

Johannes Althusius’ Politica : The Culmination of Calvin's Right of Resistance

Jean Calvin's writings on the resistance to a tyrannical ruler appear as an addendum to his Institutes of the Christian Religion, but despite their limited discussion, his followers based their own writings on his original discussion of resistance. The most celebrated of these Calvinist tracts on resistance was the Vindiciae Contra Tyrannos written as a result of the St. Bartholomew's Day Massacre. This article argues that, whilst the Vindiciae is an important example of Calvinist resistance, an even more significant, but forgotten, Calvinist resistance theory can be found in Johannes Althusius’ Politica Methodice Digesta, Atque Exemplis Sacris Et Profanis Illustrata. Furthermore, the similarities in the social, political and religious position of both Althusius and Calvin, as well as their geographical location in Emden and Geneva respectively, allows Althusius’ work to be seen as the natural culmination of Calvin's original work on the right of resistance.