1,860 research outputs found

    Ultralight reactive metal foams produced as structural shapes in space: System design

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    This autonomous experiment for foaming metals in space involved: (1) payload support structure; (2) furnace and foaming apparatus; (3) electronic controls; (4) battery power; and (5) metallurgy. Emphasis was laid on a modular design which was easily modifiable and which offered maximum durability, safety, and failure tolerance

    Recent advances in the treatment of myocardial infarction

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    Myocardial infarction is the result of atherosclerosis of the coronary arteries, and currently there is no cure for atherosclerosis and little hope of retarding its progression. However, much work has gone into the reduction of its acute cardiac manifestations as there is no specific therapy for acute myocardial infarction.Diseases of the coronary arteries are responsible for about 30% of all deaths among middle-aged men and it is increasing, the increase involving those under 45 years at a faster rate than in the older sections of the population.A study in the USA, the Framingham study has shown that more than half of those who die from acute myocardial infarction do so within one hour, and only just over half of those with an initial attack of acute infarction are admitted to hospital, This high frequency of sudden death emphasises the importance of preventing the development of ischaemic heart disease

    Photoassociation spectra and the validity of the dipole approximation for weakly bound dimers

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    Photoassociation (PA) of ultracold metastable helium to the 2s2p manifold is theoretically investigated using a non-perturbative close-coupled treatment in which the laser coupling is evaluated without assuming the dipole approximation. The results are compared with our previous study [Cocks and Whittingham, Phys. Rev. A 80, 023417 (2009)] that makes use of the dipole approximation. The approximation is found to strongly affect the PA spectra because the photoassociated levels are weakly bound, and a similar impact is predicted to occur in other systems of a weakly bound nature. The inclusion or not of the approximation does not affect the resonance positions or widths, however significant differences are observed in the background of the spectra and the maximum laser intensity at which resonances are discernable. Couplings not satisfying the dipole selection rule |J-1| <= J' <= |J+1| do not lead to observable resonances.Comment: 5 pages, 2 figures; Minor textual revision

    Sintering Kinetics of Plasma-Sprayed Zirconia TBCs

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    A model of the sintering exhibited by EB-PVD TBCs, based on principles of free energy minimization, was recently published by Hutchinson et al. In the current paper, this approach is applied to sintering of plasma-sprayed TBCs and comparisons are made with experimental results. Predictions of through-thickness shrinkage and changing pore surface area are compared with experimental data obtained by dilatometry and BET analysis respectively. The sensitivity of the predictions to initial pore architecture and material properties are assessed. The model can be used to predict the evolution of contact area between overlying splats. This is in turn related to the through-thickness thermal conductivity, using a previously-developed analytical model

    Individual Supported Living Manual

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    A Review of Best Practice in Individual Needs Planning

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