1,721,896 research outputs found
Localised tuneable composition single crystal silicon-germanium-on-insulator for low cost devices
No full textData for the paper Littlejohns, Callum, Dominguez Bucio, Thalia, Nedeljkovic, Milos, Mashanovich, Goran, Reed, Graham and Gardes, Frederic (2016) Localised tuneable composition single crystal silicon-germanium-on-insulator for low cost devices. Advances in Materials Science and Engineering</span
Casco Bay, Maine, Littlejohns Island
No full textAn image scanned from a color postcard identified as Littlejohns Island, typically referred to today as Littlejohn Island, in Casco Bay, Maine. Undated.https://digitalcommons.library.umaine.edu/spec_photos/2128/thumbnail.jp
Dataset for 'A Si Optical Modulator based on Fano-like Resonance'
No full textThis dataset supports the publication: H. Du, W. Zhang, W. Cao, D. J. Thomson, C. G. Littlejohns, X. Yan, D. T. Tran, M. Banakar, G. T. Reed (2021) 'A Si Optical Modulator based on Fano-like Resonance' published in IEEE Photonics Technology Letters
In this work, we present an experimental demonstration of a carrier depletion type Si optical modulator using Fano-like resonance, which is the first of its kind in the literature. The Fano-like resonance is obtained by weak coupling between two optical resonators in the prototype device and the PN junction is designed for carrier-depletion type electro-refractive modulation. 20 Gb/s on-off keying (OOK) is obtained in experiments on the prototype device. </span
Dataset supporting the publication "Buried 3D spot-size converters for silicon photonics"
No full textData underlying the results presented in the paper W. Zhang, M. Ebert, J. D. Reynolds, B. Chen, X. Yan, H. Du, M. Banakar, D. T. Tran, C. G. Littlejohns, G. T. Reed, and D. J. Thomson, "Buried 3D spot-size converters for silicon photonics," Optica 8, 1102-1108 (2021)</span
Germanium for photonic applications
No full textLocalized GOI wires have been grown using a LPE process resulting in single crystal layers up to 400 µm in length and 5 µm in width. We have reported on the design, fabrication and characterisation of a 4-channel AMMI structure integrated with germanium p-i-n photodetectors to form a silicon photonics receiver. Light detection at 50 Gb/s has been demonstrated with a low dark current of < 20 nA at -1 V bias. The AMMI structure exhibits a low insertion loss of < -0.5 dB and cross-talk of < -15 dB across the 4 channels
Impact of hospital and community provider based clinical audit programmes: perceptions of doctors, nurses and other health professionals
No full textA postal survey of staff (doctors, nurses, midwives, health visitors, therapy professionals, senior managers and clinical audit staff) was conducted in three English hospital and community healthcare providers. The aim was to assess staff perceptions of the impact of local clinical audit programmes and to investigate differences between staff groups. The questionnaire contained a 24 item opinion scale with a summary total: 371 out of 566 questionnaires were returned completed (66%). The majority of respondents were positive about the impact of clinical audit in their organizations, which is encouraging. However, there was a wide range of responses and significant variations between professional groups. Medical staff were significantly less positive than non-medics (p = 0.0007), and junior staff significantly less positive than seniors (p = 0.0306 for doctors and p = 0.0013 for other health care professions). After over five years experience of clinical audit in UK hospitals and community providers, many local staff remain sceptical about its real valu
Evaluating healthcare policies: the case of clinical audit
No full textSince the introduction of national programmes of clinical audit in Britain much effort has gone into evaluating them. Many observational studies, both quantitative and qualitative, have been conducted, but when these provide evidence of changes in clinical practice or outcomes it is not possible to attribute these to audit. No controlled trials of the introduction of whole programmes of audit into healthcare organisations have been conducted and it is too late to conduct one now. Several trials of selected audit interventions in Britain and elsewhere have been performed, but their results are not easily generalisable to mainstream audit activity. We still do not know and will almost certainly never know, the scale of benefits or the true costs of the British national audit programmes. Evaluative research is worth while in indicating the types of audit activity and the types of audit organisation that are most likely to bring about chang
Development of an instrument to assess staff perceptions of the impact of trust-based clinical audit programmes
No full textWe have developed and tested a questionnaire to assess staff perceptions of the impact of clinical audit within hospital and community trusts. The aim is to provide a tool for audit departments to assess the progress of their audit programmes, alongside other monitoring methods, and to identify perceived problems, and resistant or neglected groups of staff. Desirable attributes of audit programmes were identified through a qualitative analysis of policy documents from key national bodies. After pre?testing, 24 items were included in the questionnaire, along with an overall question on the value of audit, and space for written comments and suggestions. The questionnaire was piloted with health professionals in three trusts in South Thames. 371 out of 566 (66%) questionnaires were returned completed. After omitting two items the scale showed good internal consistency. The scale also performed well against the three tests of validity. The survey showed interesting differences between staff groups in the trust
Links between clinical audit and contracting systems
No full textIn 1989, a programme of clinical audit was introduced throughout the UK National Health Service (NHS), in an attempt to improve care through the application of quality methodology to clinical issues. However, the role of clinical audit in the new NHS "internal market" is unclear. Reviews evidence on the development of audit and concludes that it has operated largely in isolation, under professional control. Central policy is now advocating greater purchaser and provider management involvement in audit, enabling feedback from and to service provision and management decisions. Where there are constructive local relationships the opening up of audit should be beneficial, but these do not always exist. Discusses a range of models for the interaction of clinical audit with wider NHS management systems. Recommends a split system of professionally controlled background audit and collaborative shared audits to balance conflicting goals
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