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排序方式: 共有383条查询结果,搜索用时 609 毫秒
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Parent‐focused interventions are a potentially effective tool for preventing and reducing gang involvement, although the challenges of delivering such services are considerable. Drawing from data collected over 26 months for the ethnographic study, Youth Gangs in an English City, including interviews with parents of gang‐involved young people, we identify potential obstacles. These include: psychological barriers to the participation of parents relating to perceived denial, stigma and blame; and possible counter‐productivity of interventions. Strategies to minimise these are discussed. 相似文献
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The article presents the theoretical contextand the elements that underlie the developmentof the community well-being questionnaire. Italso discusses the reliability and validity ofthe questionnaire's scales by presentingresults from two studies carried out in urbanareas in the U.K., Ireland and Greece. Thescales assess satisfaction with the builtenvironment, environmental quality and services and facilities. They also measure personal safety, informal interaction,community spirit, income sufficiency, decisionmaking process and place attachment. Analysesshowed that they have high internal and goodtest-retest reliability. They also performwell, when subjected to factorial validity andconstruct validity assessments. 相似文献
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Safety systems are important components of high-consequence systems that are intended to prevent the unintended operation of the system and thus the potentially significant negative consequences that could result from such an operation. This presentation investigates and illustrates formal procedures for assessing the uncertainty in the probability that a safety system will fail to operate as intended in an accident environment. Probability theory and evidence theory are introduced as possible mathematical structures for the representation of the epistemic uncertainty associated with the performance of safety systems, and a representation of this type is illustrated with a hypothetical safety system involving one weak link and one strong link that is exposed to a high temperature fire environment. Topics considered include (1) the nature of diffuse uncertainty information involving a system and its environment, (2) the conversion of diffuse uncertainty information into the mathematical structures associated with probability theory and evidence theory, and (3) the propagation of these uncertainty structures through a model for a safety system to obtain representations in the context of probability theory and evidence theory of the uncertainty in the probability that the safety system will fail to operate as intended. The results suggest that evidence theory provides a potentially valuable representational tool for the display of the implications of significant epistemic uncertainty in inputs to complex analyses. 相似文献
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Samuel Nii Ardey Codjoe Felix Hayford Nyamedor Jon Sward Delali Benjamin Dovie 《Population and environment》2017,39(2):128-146
Recently, there has been significant debate about whether ‘environmental migration’ can constitute a form of adaptation to environmental change, as opposed to forced or flight migration. The Foresight Report on Migration and Environmental Change (2011) suggested environmental factors are one driver of migration, as well as political, social, economic and demographic drivers, and that—under the right conditions—migration can be a form of adaptation to changing climatic conditions. However, this is dependent on migrants having adequate social and financial capital to undertake beneficial types of migration; it further argues that environmental change may result in ‘trapped populations’ whereby people who lack the necessary resources to re-establish livelihoods elsewhere may be left exposed to increasingly severe environmental shocks and stresses in situ. Research on the climate-migration nexus in West Africa has largely focused on out-migration from the semi-arid Sahel with more limited evidence about how sea flooding interacts with migration flows. This paper attempts to help fill this knowledge gap. Using data from a representative survey of households across three coastal communities in Ghana’s Volta River Delta, this paper concludes that exposure to sea flooding may not be a primary cause of out-migration as other community, economic and political factors influence migration intentions and decisions. Thus, it is important for planned adaptation interventions to be strengthened in situ to enable households, particularly farming households, sustain their livelihoods. 相似文献
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Jon Vilasuso David Katz 《Journal of applied statistics》2000,27(1):119-130
This study applies extreme-value theory to daily international stock-market returns to determine (1) whether or not returns follow a heavy-tailed stable distribution, (2) the likelihood of an extreme return, such as a 20% drop in a single day, and (3) whether or not the likelihood of an extreme event has changed since October 1987. Empirical results reject a heavy-tailed stable distribution for returns. Instead, a Student-t distribution or an autoregressive conditional heteroscedastic process is better able to capture the salient features of returns. We find that the likelihood of a large single-day return diff ers widely across markets and, for the G-7 countries, the 1987 stock-market drop appears to be largely an isolated event. A drop of this magnitude, however, is not rare in the case of Hong Kong. Finally, there is only limited evidence that the chance of a large single-day decline is more likely since the October 1987 market drop; however, exceptions include stock markets in Germany, The Netherlands and the UK. 相似文献
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