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Now showing items 4211-4230 of 5732

R&D as a source of innovation in South Africa

Author: Gerryts, BA ; Buys, AJ Date: Jul 2008 In investigating the link between R&D and innovation, data was used from the South African Innovation Survey of 2001 (SAIS2001). The SAIS2001 results showed that South African enterprises had a relatively high level of innovation with a low ... Read more
R-HPDC of magnesium alloys

Author: Curle, UA ; Wilkins, JD ; Govender, G Date: 2013 Flexibility of the Council for Scientific and Industrial Research’s Rheocasting System (CSIR-RCS) and its rheo-high pressure die casting (R-HPDC) technology is again demonstrated, as with aluminium alloys, by processing and shape casting of ... Read more
Radar sensor technology developments as CSIR DPSS in support of persistent, ubiquitous surveillance systems

Author: Anderson, F Date: Nov 2008 South Africa, like other countries, faces the challenge of protecting its territory and its people from activities such as illegal border crossings, weapons trafficking, smuggling, piracy, poaching, organised crime, and terrorism on land, at ... Read more
Radar transmitter classification using non-stationary signal classifier

Author: Du Plessis, MC ; Olivier, JC Date: Jul 2009 This paper presents a classification method which discriminates between two radar transmitters based on the received pulses. A simple radar transmitter model is presented to which a non-stationary signal classifier is applied. The classifier ... Read more
Radial modes in phase-only twisted light beams

Author: Sephton, Bereneice C ; Dudley, Angela L Date: Aug 2017 Beams carrying orbital angular momentum (OAM) are ubiquitous in many experiments carried out today and cover a wide range of research, from surface microstructure processing to optical tweezers and communications. It follows that these beams ... Read more
Rainwater harvesting design approaches

Author: Gibberd, Jeremy T Date: Dec 2022 Different approaches have been developed to design rainwater harvesting systems. However, these have not been widely applied in schools and are not well understood. This paper presents findings from a study in which different rainwater water ... Read more
Raman spectral features of single walled carbon nanotubes synthesized by laser vaporization

Author: Moodley, MK Date: 05 Jul 2006 In Raman spectra of SWCNTs, there are many features which can be identifed with specific phonon modes and with specific Raman scattering processes that contribute to each feature. Mechanical, elastic and thermal properties are strongly ... Read more
Raman spectroscopy and gold thin film for biosensing and detection

Author: Ombinda-Lemboumba, Saturnin ; Manoto, Sello L ; Maphanga, Charles P ; Malabi, Rudzani ; Thobakgale, Setumo L ; Lugongolo, Masixole Y ; Mthunzi-Kufa, Patience Date: Feb 2020 Raman spectroscopy is commonly used for sample characterization in biology because vibrational information is very specific to the chemical bonds in molecules. This makes it an attractive approach for identification of biological materials ... Read more
Random wave fields and scintillated beams

Author: Roux, FS Date: 2009 This report present the presentation on random wave fields and scintillated beams. Read more
Randomized controlled study of the effectiveness of annual and 6-monthly screening with mass miniature radiography (MMR) for the active case-finding of cardiopulmonary TB patients

Author: Churchyard, JG ; Roux, S ; Mahlatsi, N ; Mosenogi, P ; Khotle, L ; Grant, AD ; Fielding, K ; Corbett, EL ; Hayes, R ; Chaisson, R Date: May 2003 The mining industry has used a radiological screening programme (RSP) to screen for pneumoconioses and mycobacterial diseases for decades. In a gold mining workforce, in the Free State Province, the proportion of TB cases detected by the RSP ... Read more
Range and intensity vision for rock-scene segmentation

Author: Mkwelo, Simpiwe ; Nicolls, F ; De Jager, G Date: Nov 2007 This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ... Read more
Range based power control for multi-radio multi-channel wireless mesh networks

Author: Olwal, TO ; Van Wyk, BJ ; Djouani, K ; Hamam, Y ; Siarry, P ; Ntlatlapa, Ntsibane S Date: Aug 2009 Multi-Radio Multi-Channel (MRMC) systems are key to power control problems in Wireless Mesh Networks (WMNs). In this paper, researchers present a range based dynamic power control for MRMC WMNs. First, WMN is represented as a set of disjoint ... Read more
Range doppler dynamic range considerations for dechirp on receive radar

Author: De Witt, JJ ; Nel, Willem AJ Date: Oct 2008 A dechirp on receive (DoR) concept demonstrator was recently implemented on the Fynmeet radar system of the CSIR, in an attempt to extend its high range resolution (HRR) measurement capabilities. Based on the low dynamic range observed in ... Read more
Range sections as rock models for intensity rock scene segmentation

Author: Mkwelo, Simpiwe ; De Jager, G ; Nicolls, F Date: Nov 2007 This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ... Read more
Ranking seasonal rainfall forecast skill of emerging and developing economies

Author: Landman, WA ; Barnston, AG ; Vogel, C Date: Sep 2015 Some of the biggest emerging markets economies include countries in South America, Asia and Africa. In the global south, political and developmental similarities (e.g. climate variability occurring in conjunction with marked developmental ... Read more
RAPDASA – A vehicle for product development technology diffusion in South Africa

Author: du Preez, WB ; de Beer, DJ Date: Jun 2006 The ability to design and develop new products is generally accepted as a strong enabler for improving the competitiveness of a country’s manufacturing industry. This paper describes the establishment and evolution of the Rapid Product ... Read more
Rapid detection of E. Coli O157:H7 by IFAST and ATP bioluminescence assay for water analysis

Author: Ngamsom, B ; Fourie, L ; Tarn, MD ; Kumar, S ; Moodley, K ; Land, K ; Pamme, N Date: Oct 2016 The present investigation reports isolation and detection of E. coli O157:H7 employing a simple and portable microfluidic device based on immiscible filtration assisted by surface tension (IFAST) and adenosine triphosphate (ATP) bioluminescence ... Read more
Rapid development of a command and control interface for smart office environments

Author: Ramunyisi, Ndivhuwo S ; Badenhorst, Jacob AC ; Moors, Carmen ; Gumede, Tebogo Date: Sep 2018 Speech-driven command and control is increasingly gaining momentum in the world around us. Using human speech to control appliances in trendy living spaces allows a user to control many appliances remotely. This paper discusses the rapid ... Read more
Rapid development of paper-based fluidic diagnostic devices

Author: Smith, S ; Chen, H ; Moodley, K ; Joubert, T ; Land, K Date: Nov 2014 We present a method for rapid and low-cost development of microfluidic diagnostic devices using paper-based techniques. Specifically, the implementation of fluidic flow paths and electronics on paper are demonstrated, with the goal of producing ... Read more
Rapid die manufacturing - high pressure casting of low volume non ferrous metals components

Author: Pereira, MFV Date: Nov 2006 The goal is to use Rapid Prototyping Techniques (RPT) for the direct manufacture of die components which can produce low volumes parts. The advantages of the results include: Conformal cooling; Good heat dissipation; Shorter turn around time; ... Read more

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