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Short-term DC progressive-stress tests on 200 micron thick specimens of a commercial XLPE and its silica nanocomposite intended for DC use have shown that the DC nanocomposite has a considerably higher breakdown strength than the AC XLPE. However, constant-stress tests have shown that both the nanocomposite and the unfilled XLPE have similar lifetimes at medium fields of 125–175 kV/mm. There is also...
In this work, the electrostatic forces exerted on electrical tree channels are investigated. The trees were grown in soft ‘gel-like’ silicone polymers. In these materials, the electrical charges deposited on the tree channel walls give rise to a stretching force, which is high enough to produce a mechanical deformation of the tree structure and the surrounding polymer matrix in the direction of the...
Unhealthy lifestyle behaviours have been identified as a problem amongst students. This present study investigated the prevalence and clustering of five lifestyle risk factors within a UK Higher Education (HE) institution during the period of April–May in 2008.In a cross-sectional design, 410 students completed a ‘health and lifestyle’ survey. Data was collected on psychological stress, physical activity...
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