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The temptation to free ride and the fear of exploitation are traditionally offered as factors explaining individuals' choices under conditions of social dilemma. In two experimental studies of prisoner's dilemma behaviour we demonstrate that the ratio-differences of payoffs are as important as the absolute differences in affecting the likelihood of cooperation. The implications of this additional structural determinant of dilemma choice are developed and applied to the stalled gains debate in international relations theory. By incorporating ratio-differences into the analysis 'realist' and 'liberal' theories of state behaviour may be reconciled.  相似文献   
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This article analyses political attitudes to the union in England, Scotland and Wales after the Scottish independence referendum. Using public opinion data, we explore constitutional preferences and perceptions of national grievance, before examining the role that national identity plays in structuring preferences. Our evidence shows that considerable demand exists for nationally demarcated forms of government within the UK, although these constitutional preferences do not translate in support for policy diversity across the UK. We also find evidence that these constitutional preferences relate closely to national identity, but relate also to appeals to national interest.  相似文献   
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The authors were confronted with developing a use-of-force/self-defense training program and were directly responsible for the implementation of this new inservice program. The authors found through the research, that the psychological factors were more important than the psychomotor self-defense tactics.  相似文献   
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In the 1975 referendum England provided the strongest support for European integration, with a much smaller margin for membership in Scotland and Northern Ireland. By 2015 the rank order of ‘national’ attitudes to European integration had reversed. Now, England is the UK's most eurosceptic nation and may vote ‘Leave’, while Scotland seems set to generate a clear margin for ‘Remain’. The UK as a whole is a Brexit marginal. To understand the campaign, we need to make sense of the dynamics of public attitudes in each nation. We take an ‘archaeological’ approach to a limited evidence‐base, to trace the development of attitudes to Europe in England since 1975. We find evidence of a link between English nationalism and euroscepticism. Whatever the result in 2016, contrasting outcomes in England and Scotland will exacerbate tensions in the UK's territorial constitution and could lead to the break‐up of Britain.  相似文献   
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Abstract. Following approval of a referendum in 1993, New Zealand replaced its first–past–the–post electoral system with proportional representation (PR). Although support for PR was initially high, less than a third expressed support for the new system a year and a half after its implementation. We examine two explanations for this decline. One theory assumes that dissatisfaction with the new system is the result of a growing alienation with politics, exacerbated by an unpopular coalition government that voters neither expected nor desired. Another theory assumes that evaluations of the new system are mediated by a preference for coalition or single party government. Our results indicate that a preference for single party government, guided primarily by partisan self–interest, has the largest impact. Nevertheless, negative evaluations of the performance of the coalition government helped contribute to a loss in support for PR suggesting that government performance can affect citizen's evaluation of political institutions, particularly when systems undergo radical change.  相似文献   
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Prevalence of tricyclic antidepressants (TCAs) has not been explored in pilots. The National Transportation Safety Board (NTSB) aviation accident and the Federal Aviation Administration's Civil Aerospace Medical Institute (CAMI) toxicology and medical certification databases were searched for pilots fatally injured in aviation accidents. During 1990–2012, CAMI received bio‐samples of pilots from 7037 aviation accidents. Of these, 2644 cases were positive for drugs. TCAs were present in 31. TCA blood concentrations ranged from therapeutic to toxic levels. The NTSB determined that the use of drugs and ethanol as the probable cause or contributing factor in 35% (11 of 31) of the accidents. None of the 31 pilots reported the use of TCAs during their aviation medical examination. The prevalence of TCAs in aviators was less than 0.5% (31 of 7037 cases). There is a need for aviators to fully disclose the use of medications at the time of their medical examination.  相似文献   
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