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Now showing items 4163-4182 of 5732

Q-switched Ho:YLF laser pumped by a Tm:GdVO4 laser.

Author: Esser, MJD ; Strauss, Hencharl J ; Koen, WS ; Preussler, D ; Nyangaza, K ; Bollig, C Date: Jun 2009 The authors have, through careful analysis of spectroscopic data, designed and demonstrated a diode-end-pumped, quasicontinuous wave Tm:GdVO4 laser operating at 1892 nm in order to pump a Q-switched Ho:YLF laser. The Ho:YLF maximum output ... Read more
QMRA of a wastewater system undergoing a novel treatment process for rural environments in a developing country

Author: Genthe, Bettina ; Oberholster, Paul J Date: May 2017 Conventional wastewater treatment processes such as activated sludge and biofilms are seldom used in rural South Africa due to lack of electricity and financial resources. This presentation focuses on phyco-remediation as an environmentally ... Read more
Qualitative and quantitative predictions of environmental exposure to nanomaterials from nanowaste streams

Author: Musee, N Date: Aug 2009 This presentation investigates the presence of evidence of increasing quantities of nanowaste streams into the environment, as well as the trends for nanowastes generation. The growth of nano-related patents is discussed, and the growth in ... Read more
Qualitative assessment on the surfactant traces from the organically modified nanoclay containing polymer nanocomposite

Author: Khoza, Mary ; Sinha Roy, Jayita ; Ray, Suprakas S ; Ojijo, Vincent O Date: Nov 2020 Traces of quaternary ammonium salt from dispersed nanoclay in PA6/6.6 polymer nanocomposite may have some potential toxicological effects that could pose a risk to human health. Modified nanocomposite system was produced by masterbatch melt ... Read more
Qualitative exploration into the application of Systems Engineering within a South African science council

Author: Malik, HH ; Erasmus, Louwrence D ; Pretorius, J-H C Date: Jun 2017 A description is provided on how good systems engineering processes and methods are used so that gaps can be determined by quantitative methods for informing training programs. The Systems Engineering Capability Model (SECM) is used to determine ... Read more
Qualitative study on software application usage and user behaviour at South African Digital Doorway sites

Author: Gush, Kim L ; De Villiers, MR Date: Oct 2011 Digital Doorways are rugged multi-terminal computer systems for promoting self-directed, unassisted or peer-assisted leaning in low- income communities where computer infrastructure is limited. Users develop the necessary skills through ... Read more
Quality assessment for online iris images

Author: Makinana, S ; Malumedzha, T ; Nelwamondo, Fulufhelo V Date: Jan 2015 Iris recognition systems have attracted much attention for their uniqueness, stability and reliability. However, performance of this system depends on quality of iris image. Therefore there is a need to select good quality images before ... Read more
Quality factor of aberrated gaussian laser beams

Author: Mafusire, C Date: Sep 2010 A model is used to calculate the beam quality factor of a laser beam from Zernike coefficients. It is tested by programming aberration coefficients on a laser beam and measuring the beam quality using a Shack-Hartmann wavefront sensor. The ... Read more
Quality management in construction project design and management

Author: Conradie, Dirk CU ; Roux, E Date: Mar 2008 The aim of this paper is to propose the use of simulation to improve design quality and to introduce new opportunities to use quality management throughout the various development stages of construction projects. The paper will attempt to ... Read more
Quality measurements for mobile data collection in the developing world

Author: Badenhorst, J ; De Waal, A ; De Wet, Febe Date: May 2012 The collection of speech data suitable for speech technology development is a challenge for under-resourced languages. Factors such as cost, availability of mother-tongue speakers and vast geographic distances call for techniques to optimise ... Read more
Quality measures for HRR alignment based ISAR imaging algorithms

Author: Janse van Rensburg, V ; Mishra, A ; Nel, Willem AJ Date: May 2013 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 ... Read more
Quality of bitumens in asphalt hot-mixes with emphasis on the durability of constructed premix surfacings.

Author: Van Assen, EJ ; Vlok, M ; Rust, FC Date: Aug 1992 The poor performance of asphalt surfacings either during construction or in-service, can be very traumatic to contractor, client, consultant, road-user and ultimately to the taxpayer. The binder is quite often blamed, with or without ... Read more
Quality service delivery for the community, by the community: an innovative Eastern Cape infrastructure and job creation success

Author: Wall, K ; Ive, O ; Bhagwan, J ; Birkholtz, W ; Lupuwana, N ; Shaylor, E Date: Oct 2013 A number of pilot projects in the Eastern Cape have demonstrated how the institutionally innovative and very practical social franchising partnership approach can successfully be used for the routine maintenance of low-technology water and ... Read more
Quantification of aggregate grain shape characteristics using 3-D laser scanning technology

Author: Mgangira, Martin B ; Anochie-Boateng, Joseph ; Komba, Julius J Date: Jul 2013 Aggregate shape and surface characteristics influence the performance of both bound and unbound pavement materials. This paper presents some results of an on-going study on the characterization of aggregates using a three-dimensional (3-D) ... Read more
The quantification of corona discharges on high voltage electrical equipment in the UV spectrum using a corona camera

Author: Maistry, Nattele ; Schutz, Robert A ; Cox, Ettienne Date: Sep 2018 The current power line fault detection equipment can only locate a fault by detecting corona and heat radiated by the faults. This equipment cannot quantify the ultraviolet (UV) radiation of the fault in radiometric dimensions (W/cm2). The ... Read more
Quantification of dust generating sources in gold and platinum mines

Author: Biffi, M ; Belle, BK Date: Mar 2003 This report outlines the findings of a study performed to establish the respirable dust generation characteristics of a number of mining activities. A series of thirty-eight tests were performed on five mines in order to establish the ... Read more
Quantification of dust generating sources in gold and platinum mines.

Author: Biffi, M ; Belle, BK Date: Mar 2003 This report outlines the findings of a study performed to establish the respirable dust generation characteristics of a number of mining activities. A series of thirty-eight tests were performed on five mines in order to establish the respirable ... Read more
Quantification of Inherent Respirable Dust Generation Potential (IRDGP) of South African Coals

Author: Phillips, H ; Belle, BK Date: Aug 2003 Project SIM020604 was formulated to determine the Inherent Respirable Dust Generation Potential (IRDGP) of various South African coal types from various provinces and its use in dust exposure assessment. The objective was to quantify ... Read more
Quantification of methane behaviour in continuous miner headings using a controlled environment.

Author: Van Zyl, FJ ; Belle, BK Date: Jun 2000 The aim of this project was to determine the methane control and dilution ability of the retrofitted hood and half-curtain ventilation systems. The two systems were tested in the full-scale ventilation test gallery at CSIR Miningtek’s Kloppersbos ... Read more
Quantification of risks to coastal areas and development: wave run-up and erosion

Author: Theron, A ; Rossouw, M ; Barwell, L ; Maherry, A ; Diedericks, G ; de Wet, P Date: 01 Sep 2010 In support of the effective implementation of the Integrated Coastal Management Act (Act No 24 of 2008), a review is presented of coastal hazard assessment methods. In particular the ICM Act legislates the establishment or change of coastal ... Read more

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