3,365 research outputs found

    Tracing the journey: two School-based counsellors ‘coming out’ of the counselling room. An ethnographic enquiry within a UK inner-city secondary school

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    Mental health issues for young people in the UK are relatively common, being experienced by upwards of 10% of people aged between 5 and 15 (NHS Digital, 2018). Evidence for the benefits of school-based counselling in UK schools is also steadily mounting, as is interest in and support for the idea. In spite of this, its provision within schools in England remains insecure and it has been subject to a recurring cycle of development and decline since its inception in the 1960s. This dissertation comprises a personalised account of the researchers’ own shared journey as experienced counsellors who were new to an inner-city secondary school setting and were encountering difficulties working effectively in that new context. Our initial question was therefore: How could we make sense of the difficulties we were experiencing? As our research progressed, social and cultural processes in the school community were identified, and a further question emerged: How might any of the understanding gained be used as a bridge to better connection in this setting? The research goes beyond the focus on one-one counselling that has been the emphasis of the majority of school-based counselling research and practice. It is believed that as a result the study may illuminate some of the cultural intersections and complexities inherent in the school-based counselling context that the researchers believe require greater attention if the offer of counselling within schools is to become a more secure provision. This intention led the two researchers to adopt a reflexive and ethnographic, insider research approach for the current study, which was undertaken in an inner-city setting in an area of significant deprivation with a very diverse student population. Data analysis began with early data collection, in line with a Grounded Theory approach (Charmaz, 2006 ; Glaser & Strauss, 1967) and our ongoing analysis shaped the continuing data collection. A new theory about adult-to -adolescent process termed ‘tenuous contact’ was constructed and a post-qualification conversion diploma was developed and delivered based on the research findings, which will equip counsellors to work in this sector. The study will be of interest to professionals concerned with school-based counselling and, more widely, it is hoped that it will contribute to an understanding of social and contextual issues in offering mental health support within education

    Our Plea: A Radio Sermon

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    The sermon that composes this tract was delivered by Jesse P. Sewell over radio broadcasting station WRR from the auditorium of the Pearl and Bryan Streets Church of Christ, Dallas, Texas on April 3, 1927. J.P. Sewell was president emeritus of Abilene Christian College and the regular minister of the Church of Christ in Corsicana, Texas at the time. The sermon also appeared in the Dallas News. It is a plea for a restoration of the New Testament church and loyalty to Christ and His Word.https://digitalcommons.pepperdine.edu/heritage_center/1022/thumbnail.jp

    Observer based feedback control of 3rd order LCC resonant converters

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    The paper considers specific issues related to the design and realisation of observer-based feedback of isolated output voltage for resonant power converters. To provide a focus to the study, a 3rd order LCC converter is employed as a candidate topology. It is shown that whilst resonant converters nominally operate at high switching frequencies to facilitate the use of small reactive components, by appropriate pre-conditioning of non-isolated resonant-tank voltages and currents, the resulting observer can be implemented at relatively low sampling frequencies, and hence, take advantage of low-cost digital hardware. Experimental results are used to demonstrate the accuracy of observer estimates under both transient and steady-state operating conditions, and to show operation of the observer as part of a closed-loop feedback system where the LCC resonant converter is used as a regulated power supply

    Explicit Solution of the Time Domain Volume Integral Equation Using a Stable Predictor-Corrector Scheme

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    An explicit marching-on-in-time (MOT) scheme for solving the time domain volume integral equation is presented. The proposed method achieves its stability by employing, at each time step, a corrector scheme, which updates/corrects fields computed by the explicit predictor scheme. The proposedmethod is computationally more efficient when compared to the existing filtering techniques used for the stabilization of explicit MOT schemes. Numerical results presented in this paper demonstrate that the proposed method maintains its stability even when applied to the analysis of electromagnetic wave interactions with electrically large structures meshed using approximately half a million discretization elements

    Some hydrodynamic characteristics of bubbly mixtures flowing vertically upward in tubes

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    An investigation of bubbly flow has been conducted in vertical plexiglass tubes using air and water at atmospheric pressure. The bubbly flow pattern is an entrance condition or a non-fully developed flow. A spontaneous changeover to slug or annular flow usually occurs if the channel is long enough. The experiments were performed in turbulent flow with superficial liquid velocities ranging from 5 to 30 ft/sec. The friction, hydrostatic, and momentum pressure drop have been separated and analyzed individually with the aid of two new experimental measurements. These measurements were of the wall shear force and the momentum flux. The validity of these measurements was verified with numerous single-phase tests. Several different air-water mixing methods, with the air always being introduced at the wall, had no affect on the results. Recommendations are presented for the use of these results when applied to steam-water mixtures.Sponsored by the U. S. Atomic Energy Commission DS

    Quantum control of spin-correlations in ultracold lattice gases

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    We demonstrate that it is possible to prepare a lattice gas of ultracold atoms with a desired non-classical spin-correlation function using atom-light interaction of the kind routinely employed in quantum spin polarization spectroscopy. Our method is based on quantum non-demolition (QND) measurement and feedback, and allows in particular to create on demand exponentially or algebraically decaying correlations, as well as a certain degree of multi-partite entanglement.Comment: 2 figure

    Study of Space Charge Limitation of Thermionic Cathodes in Triode Guns

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    A computer program has been developed to compute the emission of cathodes from the fully space charge limited diode equation. The emission of four different gun arrangements with thermionic cathodes of the type used in electron microscopes is investigated. Microflat cathodes with a small (≤50m in diameter) fixed emitting area show several advantages for high brightness possibilities whereas other types of cathodes for which the emitting area increases with the brightness are usually limited by too great a total emission

    A concurrency semantics for relaxed atomics that permits optimisation and avoids thin-air executions

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    Copyright is held by the owner/author(s). Despite much research on concurrent programming languages, especially for Java and C/C++, we still do not have a satisfactory definition of their semantics, one that admits all common optimisations without also admitting undesired behaviour. Especially problematic are the "thin-Air" examples involving high-performance concurrent accesses, such as C/C++11 relaxed atomics. The C/C++11 model is in a per-candidate-execution style, and previous work has identified a tension between that and the fact that compiler optimisations do not operate over single candidate executions in isolation; rather, they operate over syntactic representations that represent all executions. In this paper we propose a novel approach that circumvents this difficulty. We define a concurrency semantics for a core calculus, including relaxed-Atomic and non-Atomic accesses, and locks, that admits a wide range of optimisation while still forbidding the classic thin-Air examples. It also addresses other problems relating to undefined behaviour. The basic idea is to use an event-structure representation of the current state of each thread, capturing all of its potential executions, and to permit interleaving of execution and transformation steps over that to reflect optimisation (possibly dynamic) of the code. These are combined with a non-multi-copy-Atomic storage subsystem, to reflect common hardware behaviour. The semantics is defined in a mechanised and executable form, and designed to be implementable above current relaxed hardware and strong enough to support the programming idioms that C/C++11 does for this fragment. It offers a potential way forward for concurrent programming language semantics, beyond the current C/C++11 and Java models.This work was partly funded by the EPSRC Programme Grant REMS: Rigorous Engineering for Mainstream Systems, EP/K008528/

    Thermionic Emission Studies of Micro-Flat Single Crystal Lanthanum Hexaboride Cathodes

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    A new type of high brightness thermionic cathode has been developed. The cathode utilises emission from a small flat surface (generally less than 50 μm diameter) prepared parallel to a specific crystal plane on a single crystal of Lanthanum Hexaboride. Emission from the rest of the single crystal is suppressed by the use of a high work function coating of pyrolytic graphite. When used in a conventional triode gun, the maximum total electron emission is controlled by the area of the micro-flat, the work function and the temperature of the emitter. The Wehnelt potential serves a minor role in controlling the divergence of the beam. At certain emitter height settings, the gun produces the maximum axial brightness at zero bias. The field at the surface of the micro-flat is higher than that for pointed emitter s in a conventional configuration and no longer limits the gun brightness. As the emitting region is now parallel to a specific crystallographic surface, the emission anisotropy of LaB6 can now be utilized in developing emitters of optimum brightness. The new sources reduce Wehnelt aperture contamination and offer long lifetimes under favourable vacuum conditions

    Cyclic-averaging for high-speed analysis of resonant converters

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    Abstract—The paper describes the development and application of a cyclic-averaging technique for the rapid analysis of high-order resonant power converters. To provide a focus to the paper, particular emphasis is given to a 3rd-order LCC voltage output converter topology. The proposed methodology predicts steady-state voltages and currents throughout the circuit, and provides estimates of the stresses on the resonant circuit components. State-space simulations and experimental results from a 350 V-input/150 V-output converter are used to demonstrate a prediction accuracy comparable with time-domain integration-based techniques is achievable, while requiring only 1/10,000th of the computation time. In addition, a comparison with Spice simulation results shows that cyclic averaging provides commensurate predictions of voltage and current stresses on the resonant circuit components. Issues arising from the stray capacitance associated with the resonant inductor, and the corresponding sensitivity of the predicted output voltage, are also considered
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