Author:Oelofse, Suzanna HH; Strydom, WFDate:Oct 2010Picking at landfills is a reality at most landfills in South Africa. It is often the poorest community members that resolve to picking as a way of making a living, typically under conditions that are not conducive to their health or safety. ...Read more
Author:Botha, LR; Van Heerden, SP; Prinsloo, FJDate:Apr 2007High pressure CO2 lasers are good candidates for amplifying picosecond mid infrared pulses. High pressure CO2 lasers are notorious for being unreliable and difficult to operate. In this paper a high pressure CO2 laser is presented based on ...Read more
Author:Long, Craig S; Loveday, Philip W; Forbes, ADate:Mar 2008This paper describes the development of a deformable mirror to be used in conjunction with diffractive optical elements inside a laser cavity. A prototype piezoelectric unimorph adaptive mirror was developed to correct for time dependent phase ...Read more
Author:Williams, EF; Loveday, Philip W; De Villiers, MFRDate:31 Aug 2010A piezoelectric inchworm motor is developed for battery powered unmanned aerial vehicles where energy efficiency is critical. The motor comprises two stationary clamps and a moving extender, which uses two piezoelectric stack actuators in ...Read more
Author:Vreugdenhil, H; Taljaard, Susan; Slinger, JHDate:Jan 2012Pilot projects are policy instruments mainly applied to introduce or test new practices, concepts or technologies. Pilot projects can lead to a broader policy transition. However, the diffusion process associated with the pilot projects is ...Read more
Author:Wall, K; Bhagwan, J; Ive, ODate:Jul 2011Partnerships, using the basic principles of franchising, could address many challenges in the operation and/or maintenance of water services. Franchising provides appropriate training to people at services sites, and also offers backup off-site ...Read more
Author:Madzivhandila, VA; Majozi, T; Zhelev, TDate:Sep 2010Pinch analysis was used in this work to exploit the amount of energy available within integrated gasification combined cycle (IGCC) power plants. This work focuses on the steam path (subsystem) of IGCC power plants only. A case study on the ...Read more
Author:Lord, DA; Anderson, FP; Basson, JKDate:Oct 1984The rational development of major projects involving the marine disposal of effluents by pipelines requires the close cooperation of planners, scientists and engineers.
In May 1983, a workshop entitled 'Pipeline Discharges of Effluents to ...Read more
Author:Adedeji, KB; Abe, BT; Hamam, Y; Abu-Mahfouz, Adnan MI; Shabangu, TH; Jimoh, AADate:Feb 2017The interference effect from high voltage overhead lines on nearby metallic pipelines is a major challenge for utility owners due to the induced AC potentials on metallic pipelines. Nevertheless, numerous mitigation techniques have been ...Read more
Author:Van Doornum, GAWDate:1971The following notes are extracted from a paper presented by A.H. Kloosterman at a meeting of the Royal Netherlands Institute of Engineers on 19th November, 1970 and published in " De Ingenieur of 2nd April, 1971. In this extract, particular ...Read more
Author:Govender, Natasha; Barnard, E; Davel, MHDate:Jun 2007Although the complexity of prosody is widely recognised, the lack of widely-accepted descriptive standards for prosodic phenomena has meant that prosodic systems for most of the languages of the world have, at best, been described in ...Read more
Author:Long, Craig S; Loveday, Philip W; Groenwold, AADate:12 Mar 2006Several new planar four node piezoelectric elements with drilling degrees of freedom are presented. The authors begin by deriving two families of variational formulations accounting for piezoelectricity and in-plane rotations. The first family ...Read more
Author:Landman, K; Liebermann, SDate:Mar 2005In SA Crime Quarterly No 8 2004, the argument was made for better use of bylaws by city governments in an effort to prevent crime. Another equally effective tool available to municipalities lies in the area of urban planning. Crime is closely ...Read more
Author:Maritz, Johan; Oranje, Mark; Van Huyssteen, Elsona; Nel, VernaDate:Jun 2021Over the past 150 years, mining has been one of the most influential shapers of economic activities, social relations, spatial development patterns, power tussles and structures, political questions and debates, institutional structures, and ...Read more
Author:Green, Chéri A; Mans, Gerbrand G; Schmitz, P; McKelly, D; Te Water, MDate:May 2014Municipalities and metropolitan structures are required by law to provide sufficient response to emergency situations. In order to respond efficiently to disasters such as fire and flooding, it is necessary to place facilities optimally. This ...Read more
Author:Maherry, ADate:01 Sep 2010Ecosystems that rely on groundwater as a water source have a natural and inherent resilience to climate change. Under natural conditions aquifers are stable water sources – in fact, ecosystems reliant on groundwater are literally the refuge ...Read more
Author:Fourie, CJS; van Dam, CLDate:Nov 2008electromagnetic geophysical methods, but the frequency domain methods in particular, depend on the skindepth as a guide to the depth of investigation or penetration from the surface. By definition the skindepth is the distance where the initial ...Read more
Author:McDonald, DJDate:Mar 1985Swartboschkloof forms part of the Jonkershoek mountain catchment complex at the headwaters of the Eerste River, Cape Province. It has been selected as a primary study site for the Fynbos Biome Project multi-disciplinary studies of Mountain ...Read more
Author:Lotter-Stark, HCT; Rybick, EP; Chikwamba, Rachel KDate:Nov 2012HIV remains a global burden and without an effective vaccine, it is crucial to develop microbicides to halt the initial transmission of the virus. Several microbicides have been researched with various levels of success. Amongst these ...Read more