38 research outputs found

    Front/back tracking InGaAsP diode laser transmitter modules

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    Negative ions in the Enceladus plume

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    During Cassini’s Enceladus encounter on 12th March 2008, the Cassini Electron Spectrometer, part of the CAPS instrument, detected fluxes of negative ions in the plumes from Enceladus. It is thought that these ions include negatively charged water group cluster ions associated with the plume and forming part of the ‘plume ionosphere’. In this paper we present our observations, argue that these are negative ions, and present preliminary mass identifications. We also suggest mechanisms for production and loss of the ions as constrained by the observations. Due to their short lifetime, we suggest that the ions are produced in or near the water vapour plume, or from the extended source of ice grains in the plume. We suggest that Enceladus now joins the Earth, Comet Halley and Titan as locations in the Solar System where negative ions have been directly observed although the ions observed in each case have distinctly different characteristics

    Informal carers' experience of caring for stroke survivors

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    Background. Stroke is the third most common cause of death in industrialized countries and a major cause of adult disability. However, the burden of caring for stroke survivors usually rests with family members who have neither chosen nor volunteered for the role of 'carer'. Aims. This paper reports on a study which aimed to describe the experience of caring for a stroke survivor at one year after stroke in Scotland. Study design. Semi-structured, taped interviews were conducted with 90 carers of stroke survivors one year after stroke and the data analysed using NUD*IST. The interviews were part of a larger study, which included the administration of a range of valid and reliable multidimensional instruments to both carers and stroke survivors. The interview prompt schedule had been developed and tested in a previous study. Findings. Although a medical emergency, stroke was not always diagnosed or treated as such by either the public or general practitioners. Initially most carers found that they lacked the knowledge and skills to care for the stroke survivor at home and so they had to learn how to obtain the information and assistance required. Carers had to adapt to the changes that stroke effected in the stroke survivor and seek alternative ways of securing the resources they needed for managing their lives. They thought that they had not been prepared adequately for the caring role or assessed satisfactorily in terms of whether they could manage given their skill level, age and/or health status. Conclusions. A public health campaign to educate and inform that stroke is a medical emergency is required if stroke disability is to be minimized. The use of new technologies should be considered in facilitating carers' learning how to care. There is a need to test alternative models of stroke follow-up in multi-centre studies that are holistic and place the carer-stroke survivor at the centre of care
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