The risk of harm to archaeological artefacts in soil from dynamic subsurface pressures generated by agricultural operations: experimental studies

An investigation was made of the fracture risk to buried ceramic pots and bones from the subsurface pressures generated by agricultural operations. A method for generating subsurface pressures at 0.25 m depth in a soil bin was developed and used to explore fracture failure of modern replicates of ceramic pots corresponding to different archaeological periods and aged medieval human bone. Application of conductive traces to the objects’ surfaces allowed detection of fracturing in real‐time without excavation. Predictive models relating fracture of objects to subsurface pressure application were developed by relating the probability of fracture to observed survival statistics at increasing subsurface pressures. Subsurface pressures of above 100 kPa were sufficient to fracture the more fragile pots at a probability level of 90%. The lowest subsurface pressure causing bone fracture was 280 kPa; however, no relationship was observed between subsurface pressure and bone fracture, probably due to variation in bone material. The subsurface pressures generated and applied are within the range reported from field measurements during typical agricultural operations. They indicate that measures to control the generation of subsurface pressures would be necessary to mitigate risk of harm from agriculture to buried archaeology; for example, via low‐pressure tyres, tracks and appropriate tillage.     

Partisan Efficiency in an Open-Rule Setting: The Amending Process in the U.S. Senate, 1865–1945

Given significant differences between the House and Senate's amending processes, one would anticipate the Senate majority party to be far less successful when voting on the floor. However, recent work has demonstrated that majority party success on the Senate floor is remarkably similar to the House. We argue that an overlooked explanation for majority party success stems from its ability to control intra-party amending activity through coordination between members of the majority party. Utilizing a new data set consisting of all amendments receiving recorded roll call votes in the Senate from 1865–1945, we demonstrate that majority party extremists refrain from offering amendments despite the relative open-floor setting. Nevertheless, chamber majorities cannot restrict minority legislators from offering amendments designed to force them to cast uncomfortable votes and delay the legislative process.     

The camera goes down the streets. Dans les rues (Victor Trivas, 1933) and the Paris of the German émigrés

Marcel Carné's important clarion call to 1930s French cinema 'to take the camera down the streets' was uniquely troubled by the arrival of waves of German émigré filmmakers in the French capital. This article uses one émigré film set in Paris, Dans les rues (Victor Trivas, 1933), as a case study to discuss both the place of the city and the place of the outsider in cinematic cultural representation during this decade. It argues that despite right-wing critical discourse linking Jewish culture with the ill effects of city life, a film like Dans les rues can be seen as an important turning point in the on-screen depiction of Paris. Trivas's film may have looked backwards to 19th-century convention, but, at the same time, it responded uniquely to Carné's concerns to produce an important, though largely neglected, early example of poetic realism.     

Shoreline Change and Coastal Vulnerability Characterization with Landsat Imagery: A Case Study in the Outer Hebrides,Scotland

Abstract

Observation of cause–effect patterns of change in coastal environments provides insights into vulnerable areas and supports prediction and adaptation to flooding and erosion. Historic and periodic (6–8 year intervals) imagery from the Landsat archive is used to investigate transformations in the Atlantic coast of two Scottish islands over the period 1989–2011. Supervised classification of spectrally normalized images followed by change detection and spatial analysis reveals the patterns of change and the location of the most dynamic coastal areas. Quantitative measures of recent shifts and movement rates of relevant coastal lines, such as the lower limit of land-based vegetation, are assessed with the Digital Shoreline Analysis System. While very low rates are indicated for horizontal changes in the position of the lower limit of land-based vegetation (0.3?m?y^?1), specific areas have been subjected to high rates of coastal progradation as well as erosion (e.g. 2.5?m?y^?1 at Stilligarry). Information derived from satellite data supports the characterization of geomorphologically dynamic coasts at regional scales. With a rich and open access archive of imagery, a commitment to continuity, and compatibility with the Earth observation missions of other space programs, the Landsat mission offers useful and otherwise unavailable data for monitoring of coastal areas.     

Adjusting to Equity: The Contradictions of Neoliberalism and the Search for Racial Equality in Peru

This article traces the development of race equity initiatives in Peru in the context of economic "liberalisation" and Western cultural hegemony. Drawing on interviews with Peruvian antiracist educators, we argue that the development of race equity programmes is being shaped by contradictory sociopolitical pressures. On the one hand, these initiatives reflect the forces of neoliberal intervention and reorganisation. On the other, they are the products of the challenges presented to conservative and antiegalitarian traditions by those committed to social justice. The paper also examines how the "new" equity paradigms associated with neoliberalism are acting to obscure the existence of other antidiscrimination traditions within Peru.     

Ancient DNA typing of archaeological pig remains corroborates historical records

The recent increase in both the abundance and taxonomic range of DNA sequence data in public repositories makes it possible to determine the maternal origin of lineages of faunal archaeological material by characterizing its mitochondrial DNA. Among the most commonly represented taxa are domesticated animals, for which extensive genetic characterization has revealed high levels of genetic diversity and (in at least some cases) strong phylogeographic clustering. Such information has significant implications not only for characterizing important aspects of the occupation history of archaeological sites, but also in providing novel insights into colonisation history and the scale and scope of trade and exchange networks. This can be done through studying the origins and dispersal of proxy organisms such as commensal and domesticated animals, as well as economically important wild fauna. To illustrate this approach, we compare historical records of maritime movement of people and pigs from two sites on Lord Howe Island, Australia, to phylogeographic results of DNA extracted from pig bones.