Refining the Quadratic Crown Height Method of age estimation: do elk teeth wear quadratically with age?

Teeth are the basis for the best methods for estimating the age-at-death of archaeological and paleontological faunal remains, because they change by eruption and wear throughout an individual's life and because they preserve well. However, age-at-death can be difficult to estimate when teeth are isolated or when no known-age reference sample is available. For these reasons, researchers developed the Quadratic Crown Height Method (QCHM), a set of quadratic formulae that can be used to predict age-at-death from tooth crown height, when unworn crown height and the ages when the tooth erupts and when its crown height should reach zero can be estimated. Previous tests of the QCHM suggest that modified equations could improve the method. Here, we use crown height measurements on a sample of 226 known-age Rocky Mountain elk (Cervus elaphus) to perform such modifications. We adjust the age at which each tooth type's crown height reaches zero from the species' potential ecological longevity or average maximum life span to an age that we empirically estimate for each tooth type. We also empirically assess whether for different elk teeth the exponent in the QCHM formula is actually equal to 2; it is for M1, but for P4 it is about 1, indicating a roughly linear relationship. The exponents for M2 and M3 are intermediate, being closer to 1.5. Because different teeth wear at different rates and wear completely away at different ages, we recommend that researchers use the modified equations provided here to estimate age-at-death for samples of Cervus elaphus.     

Organic geochemical analysis of archaeological medicine pots from Northern Ghana. The multi-functionality of pottery

Sherds from pots found layered under a granite boulder in the Tong Hills of the Upper East Region of Northern Ghana seem, based on their deposition context to have been used for the preparation of medicines. Organic geochemical and isotopic analyses of these sherds and a modern day analogue reveal an n-alkanoic acid composition that is consistent with their being used in the preparation of plant derived substances. Isotopic analyses of the modern medicine pot indicate a contribution of n-alkanoic acids derived from plants that use C₄ carbon fixation, most likely maize, sorghum and/or millet suggesting that this pot was used for cooking C₄ based plant substances, perhaps, based on current analogy, staple porridge type food. The modern medicine pot could thus have had a prior use. The absence of C₄ plant residues in the archaeological sherds suggests that either staple foodstuffs differed radically to today, or, more likely, were not prepared in vessels that were to be used for medicinal purposes.     

Direct Displacement-Based Seismic Design of Eccentrically Braced Steel Frames

A series of eccentrically braced frames (EBF) are designed and subjected to nonlinear analyses to highlight ambiguities and differences in current seismic design provisions for EBF structures. This provides motivation to implement better guidance for the checking of local displacement demand considerations and move towards a displacement-based design approach. A recently proposed direct displacement-based design (DDBD) procedure for EBFs is then described and further developed in this article through the calibration of a spectral displacement reduction factors that relate the displacement of an inelastically responding structure to that of the equivalent linear representation used in the DDBD of EBFs. Such an expression is calibrated as part of this study using an experimentally validated numerical model also proposed here for the EBF links such that the actual hysteretic behavior of the links is well represented. The DDBD guidelines are applied to EBF systems from 1–15 stories in height and their performance is verified via nonlinear dynamic analyses using two different sets of design spectrum compatible ground motions. The results of the study indicate the robustness of the proposed DDBD method in limiting the interstory drifts to design limits for a variety of EBF systems with short links, thus demonstrating that the proposed DDBD method is an effective tool for seismic design of EBFs.     

Innovation and the Entrepreneurial State in Asia: Mechanisms of Bond Market Development

Abstract

Bond markets have expanded rapidly in emerging East Asian economies in recent years. Asian policymakers have played a pivotal role in this development. This process presents an interesting challenge to the developmental state literature associated with bank-based financial systems. We argue that it is best to understand the role of the state as an entrepreneurial state in the construction of these markets, focusing on institutional innovation in three mechanisms of state-led market infrastructure: national or local credit rating agencies, mortgage corporations and bond pricing agencies. National credit rating agencies rate the creditworthiness of debt in local currency. Mortgage corporations create markets in securitised housing loans. Bond pricing agencies put a value on illiquid debt instruments to enable mark-to-market portfolio management. Together, these three mechanisms constitute the core determinants of the market (demand for creditworthy products, supply of tradeable assets, and the fixing of a price to those assets). In so doing they influence the nature of market operations, producing outcomes very different from the free market ideal type. We also consider cross-country commonalities and variations in this general pattern.     

The Brno Effect: From Culture to Mind

This paper connects to several of Andrew Sherratt??s abiding interests: grand narrative, general theory, Mitteleuropa, typology, the problems of comparative method, and, tangentially, the question of the origin and nature of the relationship between faith and reason. In addition, what I have to say builds strongly on the work of David Clarke, whose powerful influence was exerted on me principally via Andrew. The title reference is to the Middle Upper Palaeolithic mammoth ivory marionette of a male human figure from Brno, Czech Republic, which serves as a pivot for my argument (although the paper does not pretend to present a detailed and fully contextualised account). By building on observations and contentions concerning the unique life-world of humans, it is possible to argue that a recognizably modern form of human intelligence appeared (and perhaps could only have appeared) as a product of some essentially accidental, initially perhaps epiphenomenal, interactions between minds and material artefacts. I want to show that the familiar idea of a genetically-driven reorganisation of cognition, moving from mind to culture, in our genus, can be challenged by a reverse proposition, using a materiality perspective to work from culture to mind.     

Hobbes and Schmitt

Many commentators are unconvinced by Carl Schmitt's interpretation of Hobbes's political theory which, to their minds, remakes Hobbes in Schmitt's own authoritarian image. The argument advanced in this essay comprises three claims about Hobbes and Schmitt and the ways in which they are construed. The first claim is that certain commentators are bewitched by a picture of authority which biases their own claims about Hobbes, perhaps in ways that they may not fully appreciate. The second claim relates to Hobbes's individualism. On Schmitt's account, it was this individualism that opened the barely visible crack in the theoretical justification of the state through which it was worm-eaten by liberalism. This essay argues that Hobbes's individualism is not what Schmitt or his critics take it to be. The individualism that figures in Hobbes's discussions of covenant and conscience, pace Schmitt, is an illusion, albeit one that lies at the very heart of his conception of the state and animates his understanding of the relationship between protection and obedience that sustains it. The essay concludes with some remarks about the wider implications of the argument it advances.     

Petrodatabase: an on-line database for thin section ceramic petrography

This paper presents an on-line database for the petrographic analysis of pottery and other ceramic artefacts (www.petrodatabase.com). It outlines how the system can be used by the archaeological community and anticipates its potential for greater comparability in thin section ceramic petrography.