Sensitivity of bulk sedimentary stable carbon isotopes to prehistoric forest clearance and maize agriculture

The stable carbon isotope compositions (δ¹³C) of tropical lake sediments and soils have been used to reconstruct the occurrence of prehistoric maize cultivation and its relative importance through time. This study assesses some of the possible variables affecting the response of lake sediment bulk organic carbon isotope (δ¹³C_TOC) values to variations in the scale of prehistoric maize cultivation and the potential of this proxy to yield quantitative estimates of the scale of prehistoric maize agriculture in small tropical watersheds. High resolution analyses of δ¹³C_TOC values, maize pollen concentrations, and mineral influx were conducted on sediments deposited during a ∼220 year period of prehistoric maize agriculture in the watershed of Laguna Castilla, a small lake in the mid-elevations of the Cordillera Central, Dominican Republic. Close correspondence between δ¹³C_TOC values and maize pollen concentrations in the Laguna Castilla sediment record indicates a close relationship between the isotopic values and the scale of prehistoric maize cultivation. Correlations between the δ¹³C_TOC signature and mineral influx indicate that the isotope record is also sensitive to variations in allochthonous carbon delivery. This study establishes that sedimentary δ¹³C_TOC values can provide a highly sensitive proxy of the spatial scale of prehistoric maize agriculture in small tropical watersheds, but emphasizes the need for a better understanding of sediment dynamics and carbon cycling in anthropogenically modified landscapes before this proxy can be widely employed in diverse archaeological settings.     

Towards a Living Archive: Making Multi Layered Research Data and Knowledge Generation Transparent

ABSTRACT

Çatalhöyük was first discovered as one of the earliest urban settlements in the late 1950s and excavated by James Mellaart between 1961 and 1965. The 9000-year-old town in central Turkey rapidly became famous internationally due to the large size and dense occupation of the settlement, as well as the spectacular wall paintings and other art that were uncovered inside the houses. Since 1993, under the direction of Ian Hodder, research at Çatalhöyük has pioneered a reflexive approach to archaeological practice, in which information is permanently open to reinterpretation by both scholars and the public. This approach acknowledges the mutual dependence of knowledge and the underlying research, to which end the Çatalhöyük Project decided to make its records available via the Web and to invite public comment since its onset. After 25 years of excavation, the project’s digital assets now amount to close to 5TB, including formal textual and numeric records, freetext documents, audiovisual materials, and a comprehensive collection of spatial data. The reflexive method, or ‘documentation of the documentation process,’ adds a separate layer of information that specifies how data have been gathered, and facilitates critique, understanding, and the evolution of knowledge.

In this paper we lay out our vision of an interactive archive that provides access to the multi layered information contained in this massive amount of data and how web technological advances have been incorporated into the digital data management at Çatalhöyük. Ultimately, the goal is to support an interdisciplinary process of assembling data into arguments on the basis of multiple lines of evidence. The ‘Living Archive’ will enable intuitive engagement across the entire variety of research, making use of the rich reflexive information stored with the data. The results of new analyses can in turn be reintegrated with the already existing data. The application will use open standards so that the knowledge gathered at Çatalhöyük can be linked with other projects that follow similar publication procedures based on the semantic web approach.     

The After School Routines of Literature-Devoted Urban Children

This paper discusses the out of school routines of a group of ‘literature-devoted’ children of the city of Madrid (Spain). The children and families were recruited for the study at a library, a children's bookstore and a puppet show in a park. Participants provided information on their weekly routines through several procedures: surveys, photographs of their daily lives, interviews based on the photographs and interviews with parents. We develop a spatially based model that allows us to identify four styles of activity in children's out of school lives: homebound children, non-scheduled children, outdoor and scheduled children, and fully scheduled children. Our results suggest that there is significant diversity in the ways in which children's after-school time is organized, even within a middle-class and socially homogeneous sample as the one in this study. Also, the range of activities our participants engage in seems to contradict current portraits of Western urban children's lives as constrained.     

Confusing the grid: spatiotemporalities,queer imaginaries,and movement

Mediating between queer theory's privileging of time as actor and geographic emphases on material spaces and identities, this article engages feminist geographies and the work of Deleuze and Guattari to understand the implications of time and space as imagined, or actors' spatiotemporal imaginaries. We draw on Massumi's metaphor of the ‘grid,’ which sediments ways of seeing self and other and logics for action and interaction. The grid incites imaginaries of time as active and space as passive, which evoke past, present, and future, offering coordinates for locating identities. Focusing on spatiotemporality, we conduct a discourse analysis of interviews with two Chilean lesbian-feminist activists, focusing on (1) overtly spatial and temporal dimensions (nation, region, history), (2) the constitution of lesbian space and identity (identity, visibility, consciousness, and community), and (3) oppositional entities that stabilize lesbian identity and space (men, gay men, feminists, universities, and queer). We demonstrate how the activists' imagining of Chile as a space with a linear history with a fixed past and present directs their actions to a particular future of pre-given positions. Nonetheless, we point to moments of disidentificatory movement that returns analytic attention to process, creation, and the open potentiality of movement. The politics of spatiotemporal imaginaries offers activists, geographers, and queer theorists ways of narrating sexualized subjects and politics that are not repetitive of identitarian debates, history as necessary sequence, or spaces as material.     

Silo or Vat? Observations on the Ancient Textile Industry in Malta and Early Phoenician Interests in the Island

This paper concerns the Bronze Age/Phoenician contact period, focusing on a cache of pottery from Mtarfa, Malta, excavated by Ward Perkins in 1939, and the evidence of coastal and other pits, possibly used in the process of dyeing textile. Dyed fabric, it is argued, may have been the reason for Phoenician contact with the island prior to colonization. Murex shells and other possible dye sources within Malta are discussed.     

The Politics of Masculinity in the (Homo-)Sexual Discourse (1880 to 1920)

Masculinity became an important topic of discussion around 1900,not only as reaction to the growing women's movement, but alsoa result of new developments in the medical and sexual sciences.In the late nineteenth century medical doctors began to takea sustained interest in same-sex sexual relations between men,giving rise to the concept of the homosexual man as feminizedand dangerous to the social order. While the medical conceptof the ‘third sex’ could also be –and was– used for emancipatory purposes by early advocates ofhomosexual rights, a group of masculinists rejected these discriminatorycharacterizations by insisting on their masculinity and arguingthat state and society were in fact based on male bonding. Thesemasculinist strategies, which sought to integrate male–malesexuality into hegemonic masculinity, represented resistanceagainst discrimination, but they also served to shore up andmodernize hegemonic structures that discriminated against womenand Jews.     

Experimental and Analytical Investigation on the Corner Failure in Masonry Buildings: Interaction between Rocking-Sliding and Horizontal Flexure

ABSTRACT

The failure mechanism of corners in masonry buildings has frequently been observed in seismic scenarios, but only a few works and no experimental investigations devoted to it are available in the literature. In this aritcle, the experimental behavior of a simple masonry corner is first analyzed, by simulating the seismic horizontal actions through a progressive tilting of the supporting base. Then, the conditions of the onset of two possible failure modes are analytically formulated: they are the rocking-sliding and the horizontal flexure mechanism. A three-dimensional macro-block model with frictional joints is used to analyze these mechanisms, while the crack patterns and the load factors are derived through the kinematic approach of the limit analysis. The evaluation of the in-plane frictional resistances involved by the rocking-sliding mechanism is performed by applying a reliable criterion previously proposed, while for the torsion strength involved in the horizontal flexure mechanism, simplified yield conditions are adopted and a possible criterion is also introduced to take into account the actual reduction of the contact surfaces. Last, the experimental findings are compared and critically interpreted in light of the analytical results and the influence of the main parameters on the prevailing mechanism is highlighted.     

Peripheral creativity: temporary cultural uses as alternatives to inefficient policies?

ABSTRACT

The article focuses on temporary and improvised cultural spaces in marginalized neighbourhoods of Rio de Janeiro, Brazil. They are presented here as alternatives to current urban and cultural policies, often based on international ‘best practices’ models with exclusionary and segregating consequences. It begins with a brief overview into North American and Western European cultural planning policies. It then analyses the instability of cultural policies in Brazil, highlighting that, after a period of State recognition of bottom-up actions, administrators have turned to a contradictory planning scheme that mixes outdated and recent international trends, leading lower-income inhabitants to self-build their own cultural spaces. Unlike many products of today’s global strand of ‘tactic urbanism’, Rio’s temporary spaces are politically charged territories of resistance. An example is ‘Cine Taquara’ – an improvised cinema and debate forum that illustrates how, in an unequal city, such initiatives can do more towards social inclusion than ready-made models.