128,480 research outputs found
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Variable domain transformation for linear PAC analysis of mixed-signal systems
This paper describes a method to perform linear AC analysis on mixed-signal systems which appear strongly nonlinear in the voltage domain but are linear in other variable domains. Common circuits like phase/delay-locked loops and duty-cycle correctors fall into this category, since they are designed to be linear with respect to phases, delays, and duty-cycles of the input and output clocks, respectively. The method uses variable domain translators to change the variables to which the AC perturbation is applied and from which the AC response is measured. By utilizing the efficient periodic AC (PAC) analysis available in commercial RF simulators, the circuit’s linear transfer function in the desired variable domain can be characterized without relying on extensive transient simulations. Furthermore, the variable domain translators enable the circuits to be macromodeled as weakly-nonlinear systems in the chosen domain and then converted to voltage-domain models, instead of being modeled as strongly-nonlinear systems directly
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Comprehensive performance assessment and public services improvement in England? A case study of the benefits administration service in local government
The purpose of this paper is to independently evaluate the impact of the Comprehensive Performance Assessment regime on one particular public service, namely the provision of Council Tax and Housing Benefits distributed by local authorities throughout the course of the regime. This service was assessed in every iteration of the CPA methodologies and it included one of the few key performance indicators (KPIs) where the definition of the performance indicator, the means of collection and the public reporting of its results, remained the same throughout the CPA period between 2002 and 2008
Housing and council tax benefits administration in England: a long-term perspective on the performance of the local government delivery system
This paper evaluates the performance of the Council Tax and Housing Benefits Administration Services delivered by local authorities since the current system for the delivery of these benefits was introduced. During this period the performance of local government has been regulated and influenced by four successive national delivery regimes imposed by central governments namely Compulsory Competitive Tendering (CCT); Best Value (BV); Comprehensive Performance Assessments (CPA) and Comprehensive Area Assessments (CAA). An earlier paper (XXXX et al. forthcoming) examined the CPA period in detail and found a significant improvement in performance across all types of authorities in all parts of the country during this period. The current paper is intended to complement this earlier analysis and provide a longer term perspective on the performance of the benefits service under successive regimes between 1993 and 2010. The findings show that under CCT the performance of the system was poor, there were wide variations in individual local authority’s performance, with many acknowledged inadequacies in the system and unacceptably high levels of fraud. However in this period and in the subsequent BV period the antecedents of some of the tools and techniques subsequently used to drive improvement in the CPA era were either put in place or were being developed
The applicability of MFD thrusters to satellite power systems
The high power self field MPD thruster uses electromagnetic forces rather than electrostatic to accelerate a neutral plasma. The most attractive application of MPD thrusters to satellite power systems is in the area of electric propulsion for a cargo orbit transfer vehicle (COTV). Calculations were performed in order to compare the performance of a COTV using an ion or MPD propulsion system. Results show that the MPD propulsion system gives a shorter trip time with the same power and payload when compared to the ion thruster propulsion system at either value of specific impulse. More important than the trip time benefit may be the advantage a MPD propulsion system provides in system simplicity. Another interesting COTV concept using MPD thrusters is the use of a remote power supply located on the Earth, at GEO, or somewhere in between to transmit power to the COTV in a microwave transmission. The specific impulse at thrust levels of tens of newtons makes a MPD propulsion system a candidate for stationkeeping and attitude control of large space structures such as a SPS
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Fast, non-monte-carlo estimation of transient performance variation due to device mismatch
This paper describes an efficient way of simulating the effects of device random mismatch on circuit transient characteristics, such as variations in delay or in frequency. The proposed method models DC random offsets as equivalent AC pseudo-noises and leverages the fast, linear periodically time-varying (LPTV) noise analysis available from RF circuit simulators. Therefore, the method can be considered as an extension to DC match analysis and offers a large speed-up compared to the traditional Monte-Carlo analysis. Although the assumed linear perturbation model is valid only for small variations, it enables easy ways to estimate correlations among variations and identify the most sensitive design parameters to mismatch, all at no additional simulation cost. Three benchmarks measuring the variations in the input offset voltage of a clocked comparator, the delay of a logic path, and the frequency of an oscillator demonstrate the speed improvement of about 100-1000x compared to a 1000-point Monte-Carlo method
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On being a mentor
This article explores issues relating to mentoring students, particularly ophthalmic nursing students. It highlights the importance of mentorship in learning in practice, which in turn is critical to students' education in a competency-based profession. It considers the factors essential in successful mentoring, including two-way feedback, and the importance of mentors understanding the nature of the psychological processes involved and how to assess students' learning and competencies. It also highlights the crucial gate-keeping role of mentors in ensuring that students are fit to practise, and the importance of nurse mentors themselves being fit to practise
Cross-correlation of the unresolved X-ray background with faint galaxies
At the faint end of the deepest X-ray surveys, a population of X-ray luminous
galaxies is seen. In this paper, we present the results of a cross-correlation
between the residual, unresolved X-ray photons in a very deep X-ray survey and
the positions of faint galaxies, in order to examine the importance of these
objects at even fainter flux levels. We measure a significant correlation on
all angular scales up to ~1 arcmin. This signal could account for a significant
fraction of the unresolved X-ray background, approximately 35 per cent if the
clustering is similar to optically selected galaxies. However, the angular form
of the correlation is seen to be qualitatively similar to that expected for
clusters of galaxies and the X-ray emission could be associated with hot gas in
clusters or with QSOs within galaxy clusters rather than emission from
individual faint galaxies. The relative contribution from each of these
possibilities cannot be determined with the current data.Comment: 7 pages LaTeX including 9 EPS figures. Uses mn.sty. Accepted for
publication by MNRA
Performative Social Science
Performative Social Science is positioned within the current era of crosspollination from discipline to discipline. Practitioners from the Arts and Humanities look to the Social Sciences for fresh frameworks, whist Social Science practitioners explore the Arts for potential new tools for enquiry and dissemination. Performative Social Science is defined and the similarities and differences between PSS and Arts-based Research (ABR) are delineated. The history of PSS is then outlined and its development, particularly at the Centre for Qualitative Research at Bournemouth University in the United Kingdom, is reviewed. Relational Aesthetics is then described in depth as the theoretical basis and grounding of Performative Social Science. Relational Aesthetics (Bourriaud, 2002) offers a theoretical ground for the complexities of connections across seemingly disparate disciplines such as the Arts and Social Sciences and for further exploration of the synergies between both disciplines as well as communities beyond the academy. An example of a large, three-year nationally funded project, culminating with the production of an award-winning short biopic, RUFUS STONE, is outlined as a prime example of a multi-method approach to social science research which includes tools from the arts in its progress and outputs. The entry concludes with goals and aspirations for Performative Social Science in the future
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