25 research outputs found

    ATLAS detector and physics performance: Technical Design Report, 1

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    Bettertonite, [Al 6

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    Equilibrium distribution of liquid during sintering of assemblies of WC/Co cermets

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    Assemblies were made by stacking on top of one another two cylinders of WC-Co cermets differing in mean WC particle size (relative size ratio of 3.5) and cobalt concentration (6 or 15 wt pct). These assemblies were bonded by heat treatment at 1400 degrees C under protective atmosphere for a dwell time of 7 hours. After completion of the heat treatment, the distributions of the cobalt concentration and WC grain size as a function of distance from the original interface between the two cermets were analyzed by combining Vickers microhardness measurements and image analysis. At equilibrium, the Co content was always larger on the side containing the smaller WC particle size. The final partition of Co was compared with the predictions of a model developed for expressing the dependence of the solid/solid and solid/liquid interface areas on the system parameters: phase volume fractions, dihedral angle., particle size, and particle coordination. An excellent agreement is found when assuming an average WC coordination of 7

    Low occurrence of equine herpesvirus 1 (EHV-1) as cause of abortion and perinatal mortality in Brazil

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    ABSTRACT: Equine herpesvirus type 1 (EHV-1) is an important pathogen that causes abortion, neonatal disease, respiratory disorders, and neurological syndrome in equine populations worldwide. To evaluate EHV-1 as a cause of abortion and perinatal mortality in Brazil, tissue samples from 105 aborted equine fetuses, stillbirths, and foals up to one month of age were examined using virus isolation, immunohistochemistry (IHC), histopathology, and nested polymerase chain reaction (PCR). Two fetuses were positive for EHV-1 by PCR, one of which showed syncytia and eosinophilic intranuclear inclusion bodies in bronchial epithelia, but it was negative by virus isolation. The other showed no characteristic histological lesions, but it was positive by viral isolation. No sample was positive by IHC. The results presented low occurrence of EHV-1 in the studied population and suggested that the use of a combination of techniques increases the likelihood of an accurate diagnosis of EHV-1
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