http://hdl.handle.net/10204/687 2013-05-19T17:45:49Z http://hdl.handle.net/10204/6189 Title: Predictive policing in an endangered species context: Combating rhino poaching in the Kruger National Park Authors: Mouton, H Abstract: This presentation outlines a proposed top-level tool for predicting rhino poaching attacks at the Kruger National Park. Description: Emerging Researcher Symposium. 4th CSIR Biennial Conference: Real problems relevant solutions, CSIR, Pretoria, 9-10 October 2012 2012-10-10T00:00:00Z http://hdl.handle.net/10204/5773 Title: Meteorologically estimated exposure but not distance predicts asthma symptoms in schoolchildren in the environs of a petrochemical refinery: a cross-sectional study Authors: White, N; teWaterNaude, J; Van der Walt, A; Ravenscroft, G; Roberts, W; Ehrlich, R Abstract: Community concern about asthma prompted an epidemiological study of children living near a petrochemical refinery in Cape Town, South Africa. Because of resource constraints and the complexity of refinery emissions, neither direct environmental measurements nor modelling of airborne pollutants was possible. Instead a meteorologically derived exposure metric was calculated with the refinery as the putative point source. The study aimed to determine whether (1) asthma symptom prevalences were elevated compared to comparable areas in Cape Town and (2) whether there was an association between asthma symptom prevalences and the derived exposure metric. Description: Copyright: 2009 White et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 2009-09-01T00:00:00Z http://hdl.handle.net/10204/4105 Title: Quantifying uncertainty contributions for fibre optic power meter calibrations Authors: Nel, M; Theron, B Abstract: A fibre optic power meter calibration has several uncertainty contributors associated with it. In order to assign a realistic uncertainty to the calibration result it is necessary to realistically estimate the magnitude of each uncertainty contributor. Two contributors that are of interest during a fibre optic power meter calibration are the effect of connector-tightening and the effect of fibre flexing. This paper reports on empirical measurements that we performed to quantify these two uncertainty contributors, the methods we used and the results thereof. It was done only for standard single mode fibre with FC connectors, and using a 1310 nm and a 1550 nm Fabry Perot laser (FP laser) Description: Test and Measurement Conference, Gauteng, Misty Hills Country Hotel & Conference Centre, 14-16 September 2009 2009-09-01T00:00:00Z http://hdl.handle.net/10204/2889 Title: Automation of measurements in the dclf laboratory of the CSIR NML Authors: Marais, EL Abstract: At the end of 2005 it was decided that a number of measurements performed in the dc Low Frequency (dclf) Laboratory of the CSIR National Metrology Laboratory (CSIR NML) could benefit from automation. The measurements identified were typically highly repetitive, and being performed using measuring instruments that can be connected to a computer with relatively little effort. A number of commercial instrumentation automation software packages were evaluated, but these packages were found to be too expensive for the purposes of a National Metrology Institute, given the programming experience available to the dclf laboratory. The software packages described in this paper were all written in Borland Delphi. To date, the following measurements were automated: calibration of digital multimeters up to 6.5 digits; capacitance measurements of a single standard capacitor and decade capacitors; and ac power measurements of single and three phase sources and meters. The following measurements are in the process of being automated: RLC measurements (inductance, resistance, and capacitance); ac-dc difference measurements and resistor calibration result analysis. The approach followed, software structure, validation and implementation of the software will be discussed. As these software packages automatically calculate the uncertainty of measurement, some time will be spent on the algorithms used for this purpose Description: Also available in the NML reports database, report number NML-06-0221. Presented at the 2006 Test and Measurement Conference. Copyright held by the National Laboratory Association 2006-01-01T00:00:00Z