A Minimum-Impact Method for Measuring Corrosion Rate of Steel-Hulled Shipwrecks in Seawater

Current research on USS Arizona is focused on a minimum-impact technique for calculating corrosion rate of the battleship's steel hull by analysing physical and chemical properties of marine encrustation covering the exposed hull. An equation is derived that allows concretion thickness, density, and total iron content to be used to calculate corrosion rate of steel hull plate.
© 2006 The Authors     

Spatial and environmental impacts on adverse birth outcomes in Ontario

This study assesses the overall spatial variations and neighbourhood‐level “hot spots” of low birth weight and preterm birth incidence within three public health units in Ontario, Canada. The analysis uses a stepwise approach of intra‐class correlation analysis, a spatial scan statistic, and multilevel spatial modeling. Results show that neighbourhood level variation accounts for only 2–3 percent of the total variation of adverse birth outcomes in the study area. However, strong spatial autocorrelation is observed at the neighbourhood level, and spatial clusters of relatively high adverse birth outcome rates exist in areas that are associated with environmental risks, including pollution sources and proximity to highways. Thus, although estimated neighbourhood impacts on adverse birth outcomes are small compared with those of individual‐level risks, local high potential environmental risk areas are identifiable. Environmental surveillance and spatial statistical analysis should be conducted regularly by local health authorities to identify and monitor the impact of environmental changes on health in general and on birth outcomes in particular. Specific community‐oriented health interventions may be required to reduce observed local health impacts.     

The Australian ballot: Not the secret ballot

Australian historical and political science academic accounts of the ‘secret ballot’ often describe it as being designed in Australia and first applied in Victoria in 1856. Narratives often focus on Chartists and radicals finding fertile ground in the New World for ideas that had met insurmountable resistance in the Mother Country. But this concentration on the ‘British story’ has led to a misconception in this country: that the secret ballot was first tried in Australia. This comes from conflating the ‘Australian ballot’ with the ‘secret ballot’. Voting by ballot, in ‘secret’—that is, not by a show of hands, on the voices or signed voting paper—was in use in America and Europe well before being implemented in Australia. This was the secret ballot many demanded for Australia, but they got something else: the Australian ballot, wholly original, with identifying features—such as the government printed ballot paper—previously unimagined. The Australian ballot was not the world's first secret ballot; it was much more important than that.     

The ‘bullets to water’ belief complex: a pan-southern African cognate epistemology for protective medicines and the control of projectiles

Remarkable similarities across colonial encounters where Africans believed projectiles could be influenced by ritual practices (medicines, behaviours, observances) demand enquiry into their conception and trajectory. Although suggestion of pan-subcontinental phenomena may elicit suspicion of a generalisation, here evidence is examined from the late-independent and colonial periods that shows that a general belief, held cognate between groups, may indeed have existed. The focus is on precolonial¹ southern African beliefs in the manipulation of projectiles and how these may have affected ritual responses to firearms during colonisation. At least a millennium of interactions between hunters, herders and farmers appear to have resulted in commonly held beliefs, albeit with differential emphases. From first contact, and into sustained colonisation, it became necessary for Africans to highlight and/or adapt indigenous beliefs as mechanisms by which to cope with firearms and settler aggressive expansion.     

国外旅游扶贫研究进展

在相关概念辨析的基础上,对国外旅游扶贫理论、实践模式、效果、研究方法、相关国际组织的作用进行了综述。国外旅游扶贫形成了较为系统的理论体系与研究框架,为旅游实践提供了理论支持。从研究内容看,自然旅游、遗产旅游、农业旅游、社区旅游是旅游扶贫的主要方式;从扶贫效果看,旅游扶贫对当地经济有较大的促进作用,但需要合理的规划与操控才能可持续。旅游扶贫研究方法以宏观的定量研究为主,研究案例呈现地理集中性。今后应加强城市贫困问题、精准旅游扶贫及中国旅游扶贫案例的研究。     

Life Among Ruins,Bermuda and Britain’s Colonial Heritage

Situated some 600 mi (965 km) east of North Carolina, the island of Bermuda is Britain’s oldest surviving colony. While much of the British Empire has been dismantled, Bermuda remains within the Imperial fold, and is today designated a “British overseas territory.” Within this framework, Bermuda’s heritage tourism landscape perpetuates an institutionally imposed colonialist narrative that neglects to explore the contributions of the island’s under-represented communities. This article explores these issues with respect to the island’s tourism plan. It concludes by highlighting new archaeological research centered on the material lives of enslaved Bermudians.