644 research outputs found
Arnol'd Tongues and Quantum Accelerator Modes
The stable periodic orbits of an area-preserving map on the 2-torus, which is
formally a variant of the Standard Map, have been shown to explain the quantum
accelerator modes that were discovered in experiments with laser-cooled atoms.
We show that their parametric dependence exhibits Arnol'd-like tongues and
perform a perturbative analysis of such structures. We thus explain the
arithmetical organisation of the accelerator modes and discuss experimental
implications thereof.Comment: 20 pages, 6 encapsulated postscript figure
Exploring women's sensory experiences of undergoing colposcopy and related procedures: implications for preparatory sensory information provision
INTRODUCTION: Some women experience distress during colposcopy examinations which is partly related to women's fear, or experience, of pain during the procedure. However, little is known about women's sensory experiences of colposcopy (other than pain) or what might impact on these experiences. The aim of this study was to explore women's sensory experiences of colposcopy and related procedures and identify factors which influenced negative sensory experiences. METHODS: In-depth interviews were conducted with 23 women who had undergone, for the first time, a colposcopy (some with related procedures, including punch biopsies and loop excision) as part of follow-up for abnormal cervical cytology. Interviews were analysed thematically using the Framework Approach to organise the data and identify emerging higher-order themes. RESULTS: Women described a range of sensory experiences including pain or discomfort, cramping, stinging and cold sensations (due to the application of acetic acid to the cervix). Four key themes emerged as important aspects of the overall sensory experience: levels of pain, treatment-specific sensations, anaesthetic-specific sensations and solution-specific sensations. Factors that may influence women having a negative sensory experience were sensory expectations of the procedure(s) and lack of preparatory sensory information. DISCUSSION: Our study provides unique in-depth insight into women's sensory experiences of colposcopy and related procedures and suggests women require more preparatory sensory information. The issues identified as contributing to women having a negative sensory experience may help inform the development of pre-colposcopy information which may better prepare women with abnormal cervical cytology for follow-up examinations
Pay progression in routinised service sector work: navigating the internal labour market in a fast food multinational company
The United Kingdom's widespread use of lowâskill, lowâpaid employment has been well documented. It has been argued internal labour markets (ILMs) benefit such workers, affording them with opportunities for progression. Relatively little is known, however, about the impact of ILMs on entry level workers undertaking routinised service sector work. Drawing on qualitative data, this article explores the prospects on offer in a market leading, fast food multinational company. Potential enabling features include onâtheâjob training, a transparent and integrated pay structure and a professed culture of progression. Occupational movements to positions above the lowâpay threshold are, however, relatively rare. We conjecture this contradiction is the result of the business context in which the firm operates. The findings suggest that in sectors where price leadership strategies dominate, escape from low pay is likely to be exceptional, even within large organisations featuring some of the classic characteristics of âpureâ or strong ILMs
CMR quantification of aortic regurgitation in asymptomatic patients with significant aortic regurgitation: prediction of clinical outcome
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