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The possibility of lead isotope fractionation in ancient lead production is examined. Kinetic theory relating to isotopic fractionation in non-equilibrium evaporation is considered and the feasibility of the alteration of lead isotope abundance ratios in ore roasting and smelting is assessed. Previous experimental work is shown to have been inconclusive and conclusions are drawn on the need for further research to quantify the possible extent of fractionation in practice. 相似文献
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ALUN THOMAS 《Russian Review》2017,76(3):502-525
Immediately following the Russian Civil War, new Soviet authorities sought to resolve a series of conflicts involving the nomadic communities living along the north and eastern shores of the Caspian Sea. To the north, beyond the Ural River, nomads competed with Russian farmers for pasturage. Further south, around the Garabogazkol Lagoon, nomads from different tribes were engaged in a cycle of violence and recrimination. Communist party members, working alongside local elites, interpreted all these conflicts as disagreements between nations and proffered solutions congruent with this analysis. Peace agreements were written and signed, borders drawn, and national territorial jurisdictions extended and defended. In both areas conflict was not resolved and nomadic hardship was in fact exacerbated. The Caspian Disputes and their incomplete resolution contain lessons on the Soviet state's treatment of two minorities: non‐Russian nationalities and nomads. For the former, we see the limited utility of a European conception of nationalism applied to Soviet Central Asia. For the latter, we see what influenced and complicated the relationship between nomad and state before the collectivization campaign endowed that relationship with a brutal simplicity. This represents a step towards a more comprehensive understanding of how Soviet power treated nomads from its very inception. 相似文献
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Access to adequate, affordable housing is an essential first step in the re-settlement process for immigrants and refugees. It is the basis from which newcomers look for jobs, language training and other services. Without such housing, newcomers may have limited security of tenure, compromised health, jeopardized education and employment opportunities and impaired social and family life. Refugees generally face the greatest challenges of all newcomers and find their housing choices constrained by many factors. This article presents the results of a study of refugee housing circumstances in Winnipeg. Key socio-economic, housing and neighbourhood characteristics important to successful re-settlement are documented and analyzed. The longitudinal nature of the study facilitates exploration of trajectories in a variety of indicators over time. The picture that emerges is one of the improving trajectories in many key indicators but also of very difficult circumstances that negatively affect the re-settlement process and the effective integration of refugee households. The article ends with suggestions for policy and program changes that would improve the housing circumstances of newly arrived refugee households. 相似文献
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THOMAS STIEVE 《Tijdschrift voor economische en sociale geografie = Journal of economic and social geography = Revue de géographie économique et humaine = Zeitschrift für ?konomische und soziale Geographie = Revista de geografía económica y social》2005,96(1):3-14
Some theories contend that national identity is dependent and contingent on having others. However, other theories suggest that national identity is based on traits that all members of the group share. These two competing ideas, called relational and unifying characters respectively, are explored using the two border cites of Niagara Falls, Canada and Niagara Falls, the United States. I argue that each national identity present, the Canadian and American, represent the two characters and that national identity can be viewed as a spectrum. Using content analysis, each city's newspaper is studied for its expression of both characters. 相似文献