68,082 research outputs found

    Achieving patient-focused maintenance services/systems

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    Purpose – The purpose of this paper is to identify and investigate the contribution made from the estates services to the quality of the patient experience from the perspective of all estates staff ranging from front-line staff to directors of estates and facilities. The work is exploratory in nature owing to no known earlier studies in this area. Design/methodology/approach – A postal questionnaire is distributed to a non-random self-selecting group of National Health Service (NHS) estates staff – therefore those staff working in the areas of maintenance, engineering, building, gardening and general office estates management. A total of 920 questionnaires are distributed to the 46 NHS trusts. There are 202 responses, which is a return rate of 22 per cent. Findings – It is clear that overall estates staff consider their job/service to be important to the patient experience, 94 per cent of respondents indicate they did. This is further confirmed by 82 per cent of estates line managers considering their job to be important to the patient experience. In terms of how estates feel they contribute to the patient experience, there is a range of responses, however the main reason highlighted is the recognition that the hospital could not function without the service being provided, i.e. the maintenance of essential services, water, power and the general infrastructure. Estates departments perhaps need on patient awareness of the services they provide and the importance of them in making the hospital function. Research limitations/implications – The results presented provide a useful insight into how estates departments in the NHS perceive their contribution to the patient experience. However, they are not without limitations. First, the sample size is relatively small; and second non-random sampling techniques are used. Originality/value – The findings suggest a number of avenues for future work. The most obvious would be to investigate the level of awareness from patients regarding estates services in the NHS

    A study of sound generation in subsonic rotors, volume 2

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    Computer programs were developed for use in the analysis of sound generation by subsonic rotors. Program AIRFOIL computes the spectrum of radiated sound from a single airfoil immersed in a laminar flow field. Program ROTOR extends this to a rotating frame, and provides a model for sound generation in subsonic rotors. The program also computes tone sound generation due to steady state forces on the blades. Program TONE uses a moving source analysis to generate a time series for an array of forces moving in a circular path. The resultant time series are than Fourier transformed to render the results in spectral form. Program SDATA is a standard time series analysis package. It reads in two discrete time series and forms auto and cross covariances and normalizes these to form correlations. The program then transforms the covariances to yield auto and cross power spectra by means of a Fourier transformation

    A study of sound generation in subsonic rotors, volume 1

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    A model for the prediction of wake related sound generation by a single airfoil is presented. It is assumed that the net force fluctuation on an airfoil may be expressed in terms of the net momentum fluctuation in the near wake of the airfoil. The forcing function for sound generation depends on the spectra of the two point velocity correlations in the turbulent region near the airfoil trailing edge. The spectra of the two point velocity correlations were measured for the longitudinal and transverse components of turbulence in the wake of a 91.4 cm chord airfoil. A scaling procedure was developed using the turbulent boundary layer thickness. The model was then used to predict the radiated sound from a 5.1 cm chord airfoil. Agreement between the predicted and measured sound radiation spectra was good. The single airfoil results were extended to a rotor geometry, and various aerodynamic parameters were studied

    Comparison of boiler feed pumps for cesium and potassium Rankine cycle systems

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    Comparison of electromagnetic and centrifugal pumps for cesium and potassium Rankine cycle system

    Generation of twin Fock states via transition from a two-component Mott insulator to a superfluid

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    We propose the dynamical creation of twin Fock states, which exhibit Heisenberg limited interferometric phase sensitivities, in an optical lattice. In our scheme a two-component Mott insulator with two bosonic atoms per lattice site is melted into a superfluid. This process transforms local correlations between hyperfine states of atom pairs into multi-particle correlations extending over the whole system. The melting time does not scale with the system size which makes our scheme experimentally feasible.Comment: 4 pages, 4 figure

    A space communications study Final report, 15 Sep. 1966 - 15 Sep. 1967

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    Investigation of signal to noise ratios and signal transmission efficiency for space communication system

    Nature of the spin liquid state of the Hubbard model on honeycomb lattice

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    Recent numerical work (Nature 464, 847 (2010)) indicates the existence of a spin liquid phase (SL) that intervenes between the antiferromagnetic and semimetallic phases of the half filled Hubbard model on a honeycomb lattice. To better understand the nature of this exotic phase, we study the quantum J1−J2J_1-J_2 spin model on the honeycomb lattice, which provides an effective description of the Mott insulating region of the Hubbard model. Employing the variational Monte Carlo approach, we analyze the phase diagram of the model, finding a phase transition between antiferromagnet and an unusual Z2Z_2 SL state at J2/J1≈0.08J_2/J_1\approx 0.08, which we identify as the SL phase of the Hubbard model. At higher J2/J1≳0.3J_2/J_1\gtrsim 0.3 we find a transition to a dimerized state with spontaneously broken rotational symmetry.Comment: 5 pages, 6 figure

    The use of aerial photographs for estimating school sizes of cetaceans

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    ENGLISH: The accuracy and precision of dolphin school size estimates based on aerial photograph counts were examined using data collected on recent aerial and ship surveys. These estimates were found to be accurate during a 1979research cruise aboard a tuna purse-seiner; dolphin schools were photographed from the ship’s helicopter, encircled with the purse-seine, and then counted as the dolphins were released from the net. A comparison of photographic estimates with these counts indicated that the relationship was fairly close and gave no indication of significantly differing from 1:1. During a 1980 aerial study, photographic estimates from different schools, passes, and camera formats were compared and were found to be quite precise with a standard deviation of approximately 60/0 of school size. Photographic estimates were also compared with estimates made by aerial observers. Most observers tended to underestimate school size, particularly for large schools. The variability among observers was high, indicating that observers should be individually calibrated. SPANISH: Se examinó la exactitud y la precisión de las estimaciones de la magnitud de los cardúmenes de delfines basadas en el cálculo de las fotografías aéreas, usando los datos obtenidos en los últimos reconocimientos aéreos y de los barcos. En 1979, durante un crucero de investigación en un cerquero atunero, se encontró que estas estimaciones eran acertadas; se fotografiaron los cardúmenes de delfines desde un helicóptero del barco, cercados con la red y luego se contaron a medida que se libraban los delfines de la red. Una comparación de las estimaciones fotográficas con estos cálculos indicó que la relación era bastante aproximada y no hubo indicación que se diferenció significativamente de la razón 1:1. Durante un estudio aéreo en 1980, se compararon las estimaciones fotográficas de diferentes del cardúmenes, en los pases y los formatos de las cámaras y se encontró que eran bastante precisos, con una desviación normal de cerca del 60/0 de la magnitud cardumen. Se compararon también las estimaciones fotográficas con las estimaciones realizadas por los observadores aéreos. La mayoría de los observadores tienden a subestimar la magnitud de los cardúmenes, especialmente los cardúmenes grandes. La variabilidad entre los observadores fue elevada, lo que indica que se deben calibrar individualmente los datos de observadores. (PDF contains 39 pages.

    A comparison of vertical velocities measured from specular and nonspecular echoes by a VHF radar

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    For a number of years, there have been doubts about the accuracy of vertical wind velocities measured with quasi-specular reflections from mesosphere-stratosphere-troposphere (MST) radar. The concern has been that the layers producing the quasi-specular reflection process this hypothetical tilt. Because of the quasi-specular reflection process, this hypothetical tilt would control the effective zenith angle of the radar antenna beam so that a small component of the horizontal velocity would be included in what was assumed to be a truly vertical beam. The purpose here is to test the hypothesis that there is an effect on the wind velocities measured on a vertical antenna beam due to a long-term tilting of the stable atmospheric layers that cause quasi-specular reflection. Gravity waves have been observed to cause short-term tilting of turbulent layers and specularly reflecting layers. In both cases, the effect was a wave-like deformation atmospheric layers with a period of a few minutes. This geometry is shown. Because of this influence of gravity waves, it was expected that there would be short-term variations in the vertical velocity


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    Niagara Mohawk Power Corporation utilized a demand revealing public good mechanism to implement a green electricity program for provision of renewable energy and planting trees. This GreenChoiceTM program provided an opportunity to test the reliability of contingent valuation for predicting actual participation levels. In this study, participation levels predicted by hypothetical open-ended and dichotomous choice questions are compared to a reference level obtained from the actual GreenChoiceTM program. This approach represents an important improvement over past public goods contingent valuation validity tests which have relied on voluntary contribution mechanisms to elicit actual willingness to pay, and thus are likely to overestimate hypothetical bias because of free riding. Yet, even with a demand revealing mechanism and controlling for awareness, hypothetical participation levels obtained from dichotomous choice responses are found to significantly exceed actual contributions. In contrast, open-ended responses predict actual contribution levels, in that hypothetical open-ended responses are not significantly different from actual responses. Calibration of hypothetical responses is also explored.Public Economics, Resource /Energy Economics and Policy,
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