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Tin, as a constituent of bronze, was central to the technological development of early societies, but cassiterite (SnO2) deposits were scarce and located distantly from the centres of Mediterranean civilizations. As Britain had the largest workable ore deposits in the ancient Western world, this has led to much historical speculation and myth regarding the long-distance trading of tin from the Bronze Age onwards. Here we establish the first detailed chronology for tin, along with lead and copper deposition, into undisturbed ombrotrophic (rain-fed) peat bogs located at Bodmin Moor and Dartmoor in the centre of the British tin ore fields. Sustained elevated tin deposition is demonstrated clearly, with peaks occurring at 100–400 and 700–1000 calendar years AD – contemporaneous with the Roman and Anglo-Saxon periods respectively. While pre-Roman Iron Age tin exploitation undoubtedly took place, it was on a scale that did not result in convincingly enhanced deposition of the metal. The deposition of lead in the peat record provides evidence of a pre-Roman metal-based economy in southwest Britain. Emerging in the 4th century BC, this was centred on copper and lead ore processing that expanded exponentially and then collapsed upon Roman colonization during the 1st century AD.  相似文献   
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Abstract

This article examines the complex relations between spatial planning and its cultural context (including the specific socio-economic patterns and related cultural norms, values, traditions and attitudes). To be able to analyze the extent to which spatial planning adapts to external pressures such as Europeanization, a “culturized planning model” with the three dimensions “planning artefacts”, “planning environment” and “societal environment” is used. It can be observed that the “harmonization” of spatial planning practices can result from external pressures such as EU regulations as well as (horizontal) collective learning processes. However, “harmonization” does not necessarily result in convergence. Adaptational pressures such as Europeanization often result in the customization of existing structures, frames and policies (“planning artefacts” and “planning environment”) but do not fundamentally change the underlying core cultural traits (“societal environment”). These cultural traits are quite resistant to change and help maintain a diversity of planning cultures and policies in Europe.  相似文献   
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In recent years the term empire has been used to describe an oppressive global situation. Empires are marked by their efforts to control all of life, not only politics and economics, but also society, culture, and religion. Since their inception, liberation theologies have addressed this oppressive global situation by focusing on its various manifestations in terms of race, ethnicity, nationality, gender, sexuality, and class. As the oppressive global situation tightens and contemporary liberation movements increasingly bring together its various manifestations, liberation theologies need to devise common strategies and models for resistance without abandoning their diverse legacies.  相似文献   
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