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Accurate calibration of the short circuit test setup is necessary for the certification of circuit breakers. The traditional method of measuring the electrical characteristics (such as open circuit voltage, short circuit current, power factor or time constant) requires manually selecting key points from a graphical plot and calculating the relevant parameters, which is time consuming and may introduce...
Observations of lightning strikes to Brixton Tower in South Africa are investigated in this paper. The tower is topographically situated in an ideal location to study lightning strikes, and has the benefit of a physical height of 250 m. Observations presented in this paper were made through photographic recordings of lightning events from November 2009 to May 2010. Lightning data from the Southern...
A control and observation centre for rocket triggered lightning research has been constructed. A risk analysis performed using IEC 62305-2 shows that the risk of loss of life within the structure under normal conditions is well below the tolerable risk level. By adjusting the equations defined in the risk standard risks associated with individual events can be calculated. The implication of these...
We assessed the effects of activation with phorbol myrystic acetate (PMA) and ionomycin on peripheral blood mononuclear cells (PBMC) from HIV-infected individuals by 51 Cr release, propidium iodide (PI) uptake, electron microscopy, and DNA analysis. Up to 70% 51 Cr release was induced from PBMC of HIV-infected individuals, versus up to 26% 51 Cr release from PBMC of non-HIV-infected...
The identification of differential patterns of change across the lifespan in quantitative traits is of abiding interest in the biological and gerontological research communities. These differential phenotypic patterns in complex systems illuminate developmental processes and form the foundation for the identification of putative biomarkers of aging. The goal of the present study was to explore changes...
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