169 resultados para Choruses (Mixed voices)

em QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast


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Young people’s understandings of sexual readiness are under-researched and their perspectives are often missing in debates about sexuality and sex education. Research to date has predominantly focussed upon age and socio-cultural predictors of sexual debut, thus failing to explain how young people themselves conceptualise their readiness for sexual relations. Synthesised in this review is the evidence from 26 studies which included young people’s perspectives of their readiness to begin sexual intercourse, undertaken using either quantitative or qualitative methods. Available evidence suggests that young people may not view initiating sex as problematic, focusing instead on the rewards sex brings and less on health concerns. Gender differences emerged in conceptualisations of love, parenthood, respect and abuse within relationships and were further mediated by social class and ethnicity. Age was also significant in young people’s accounts. Those under 16 years may not be ‘sexually ready’ because their own retrospective analyses suggest they experienced difficulty negotiating their risk of coercion or exploitation. More research exploring more deeply young people’s understandings of sexual readiness is required. We recommend a rights-based approach to support young people’s participation in the research process and to include their voices in the development of relevant sex education and services.

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This study describes an investigation into the characteristics, needs and experiences of kinship foster carers in Northern Ireland. By adopting a mixed-methods approach with 54 carers, a number of salient themes was captured. The respondents were predominantly grandparents who experienced a significant incidence of health-related issues. The cohort also endured high levels of stress, particularly at the beginning stage of the foster placement. Consequently, their need for practical, emotional and respite support was most evident. In terms of the children for whom they cared, many required help at school, and some presented with challenging emotions and behaviours. Overall, these findings emphasised the importance of relationship-based social work and demonstration of accurate empathy to the carer.

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An entangled two-mode coherent state is studied within the framework of 2 x 2-dimensional Hilbert space. An entanglement concentration scheme based on joint Bell-state measurements is worked out. When the entangled coherent state is embedded in vacuum environment, its entanglement is degraded but not totally lost. It is found that the larger the initial coherent amplitude, the faster entanglement decreases. We investigate a scheme to teleport a coherent superposition state while considering a mixed quantum channel. We find that the decohered entangled coherent state may be useless for quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.

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Quantum teleportation for continuous variables is generally described in phase space by using the Wigner functions. We study quantum teleportation via a mixed two-mode squeezed state in Hilbert-Schmidt space by using the coherent-state representation and operators. This shows directly how the teleported state is related to the original state.