3,384 research outputs found

    A parents group and its relation to the problem of mental retardation

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    Thesis (Ed.M.)--Boston Universit

    Comparison of two approaches to forced convection in crystal growth of II-VI compounds by THM

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    Hg1 - xCdxTe and Cd1 - xZnxTe single crystals were grown by the tracwelling heater method (THM), applying two different techniques of artificially stirring the solution zone. Accelerated crucible rotation (ACRT) was used in a vertical growth arrangement and compared a technique with constant rotation around the horizontal axis of the ampoule. The dominant hydrodynamic mechanisms of noth methods are discribed by the rotating disc model and are suggested to be almost identical with respect to the growth conditions at the interface. Convective flow is effectively enhanced adhacent to the growing crystal, where the matter transport is regarded as the rate-limiting step of solution growth. Inclusion density analysis by IR microscopy was used to characterise the crystals of Cd1 - xZnxTe grown at different rates. It was shown that forced convection allows an increase in the crystal growth rate from a few mm day-1 with ACRT or horizontally rotating THM

    Growth of Hg1−xCdxTe single crystals by travelling heater method under accelerated crucible rotation conditions

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    The accelerated crucible rotation technique (ACRT) has been applied to the THM growth of Hg1−xCdxTe crystals to grow the crystals at a higher rate. These higher growth rates, which should be achieved by extending the regions of conventional stirring towards the interfaces, have been used in an attempt to explain the results in terms of simple constitutional supercooling arguments. Some different ACRT cycles which fulfil simple hydrodynamic and geometric criteria have been studied. The grown crystals were investigated with respect to their metallurgical homogeneity and their structural perfection. These properties have not been degraded by increasing the growth rate from 1.5 to 8.5 mm per day

    QCD Pressure at Two Loops in the Temporal Gauge

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    We apply the method of \underline{zeta} functions, together with the nμ∗n_\mu^*-prescription for the temporal gauge, to evaluate the thermodynamic pressure in QCD at finite temperature TT. Working in the imaginary-time formalism and employing a special version of the unified-gauge prescription, we show that the pure-gauge contribution to the pressure at two loops is given by P_2^{\mbox{{\scriptsize gauge}}} = -(g^2/144)N_cN_gT^4, where NcN_c and NgN_g denote the number of colours and gluons, respectively. This result agrees with the value in the Feynman gauge.Comment: 19 pages, 2 figures, list of 63 integral

    Health and wellbeing in a deep plan office space

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    This research tracks public sector employees as they move from a 1960s office building into a purpose-built, environmentally sound, office accommodation. It hypothesises that in this instance the attempts to change the image and effectiveness of an organisation by changing workspace layouts has been ineffective and considers the consequent implications for individuals working in that organisation. It looks at the likely relationship between health and wellbeing of individuals and productivity. The case study is founded in the public sector but the findings are equally applicable to private sector workplaces

    BREEAM for Healthcare - a report for NHS Estates and Facilities Policy

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    This report considers sustainable healthcare properties and in particular the use of BREEAM for Healthcare 2008 and the options for improving sustainability across the NHS
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