http://hdl.handle.net/10204/12 2013-05-19T23:48:10Z http://hdl.handle.net/10204/6734 Title: The influence of lead length on the fractures associated with leading corners and sidings Authors: Turner, PA; Reinartz, R Abstract: Stopes on three reef horizons and at various depths were examined in the vicinity of inter-panel leads. The general geometry of fractures in the vicinity of inter-panels leads is outlined. The extend of fracturing parallel to the siding between leading and lagging panels was found generally to extend further into the lagging panel with increasing lead length. Curves fitted to the data seem to be asymptotic to a limiting fracture extent of about 15 to 20 m. More information is needed on the siding-parallel fracture extent associated with very long lead lengths. Other aspects requiring further investigation are outlined. Description: Copyright: 1989 Pretoria: CSIR. 1989-02-01T00:00:00Z http://hdl.handle.net/10204/6733 Title: Quality measures for HRR alignment based ISAR imaging algorithms Authors: Janse van Rensburg, V; Mishra, A; Nel, W Abstract: Some Inverse Synthetic Aperture Radar (ISAR) algorithms form the image in a two-step process of range alignment and phase conjugation. This paper discusses a comprehensive set of measures used to quantify the quality of range alignment, with the aim of 1) reviewing their benefits and shortcomings and 2) comparing their relative performance. Some quality measures may favour particular alignment techniques without adequately indicating improved alignment, so using multiple quality measures provide an added means of verifying the alignment quality achieved by any alignment technique. The sensitivity of the quality measures to slight misalignment of profiles and the effects of noise is also investigated. Description: IEEE Radar Conference 2013, Ottawa Canada, 29 April - 3 May 2013 2013-05-01T00:00:00Z http://hdl.handle.net/10204/6732 Title: The behaviour of cemented backfill and the surrounding rockmass at western deep levels south mine Authors: York, G; Squelch, AP Abstract: Cemented backfill is used at Western Deep Mine as local and regional support areas of high stopping width. The in situ performance is reported and compared to laboratory tests. A back analysis was carried out to obtain a more accurate value of the in situ (Young's)modulus was found to be in the range 45-50 GPa. Description: Copyright: 1992 Pretoria: CSIR (Report No. 18/92), pp 1-27 1992-11-01T00:00:00Z http://hdl.handle.net/10204/6731 Title: Solar disinfection of drinking water in the prevention of dysentery in South African children under 5 years: the role of participant motivation Authors: Du Preez, M; Mcguigan, K; Conroy, RM Abstract: This 1-year randomized controlled trial investigated the effect of SODIS of drinking water and motivation on the incidence of dysentery and nondysentery diarrhea among children of age 6 months to 5 years living in periurban communities in South Africa.Wecompared 383 children in 297 households using SODIS with 335 children in 267 households with no intervention. At baseline 62.4% of the study households had stored water which met WorldHealth Organization guidelines for zero thermotolerant coliforms per 100 mL. Dysentery was recorded using a pictorial diary. Incidence of dysentery was significantly associated with higher motivation, defined as 75% or better completion of diarrhea data. Incidence rates were lower in those drinking solar disinfected water (incidence rate ratio 0.64,95% CI 0.39-1.0, P ) 0.071) but not statistically significant. Compared with the control, participants with higher motivation achieved a significant reduction in dysentery (incidence rate ratio 0.36, 95% CI 0.16-0.81, P ) 0.014). However, there was no significant reduction in risk at lower levels of motivation. Solar disinfection was not significantly associated with nondysentery diarrhea risk overall (P ) 0.419). A statistically significant reduction in dysentery was achieved only in households with higher motivation, showing that motivation is a significant determinant for measurable health gains. Failure of threequarters of participants to achieve a significant reduction in dysentery suggests that research into effective implementation is required. Description: Copyright: 2010 Environmental Science and Technology. This is an ABSTRACT ONLY. The definitive version is published in Environmental Science and Technology, vol. 44(22), pp 8744-8749 2010-11-01T00:00:00Z