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Now showing items 3817-3836 of 5732

Packets distribution in a tree-based topology wireless sensor networks

Author: Akpakwu, GA ; Hancke, GP ; Silva, BJ ; Abu-Mahfouz, Adnan MI Date: Jul 2016 The concept of data distribution within cluster of sensor nodes to the source sink has resulted to intense research in Wireless Sensor Networks (WSNs). In this paper, in order to determine the scheduling length of packet distribution, a ... Read more
Packhouse to port: Investigating temperature breaks in the South African summer fruit export cold chain

Author: Freiboth, H ; Goedhals-Gerber, LL ; van Dyk, E ; Dodd, M Date: Oct 2014 A large amount of fruit and money is lost every season due to breaks in the South African fruit export cold chain. With food security becoming an ever growing concern, especially in developing countries like South Africa, a high percentage ... Read more
Paediatric frontal chest radiograph screening with fine-tuned convolutional neural networks

Author: Gerrand, Jonathan D ; Williams, Quentin R ; Lunga, D ; Pantanowitz, A ; Madhi, S ; Mahomed, N Date: Jul 2017 Within developing countries, there is a realistic need for technologies that can assist medical practitioners in meeting the increasing demand for patient screening and monitoring. To this end, computer aided diagnosis (CAD) based approaches ... Read more
Paint stripping with high power flattened Gaussian beams

Author: Forbes, A ; Du Preez, NC ; Belyi, VN ; Botha, LR Date: Aug 2009 In this paper the researchers present results on improved paint stripping performance with an intra-cavity generated Flattened Gaussian Beam (FGB). A resonator with suitable diffractive optical elements was designed in order to produce a ... Read more
PAM-lite: Fast and accurate k-medoids clustering for massive datasets

Author: Olukanmi, PO ; Nelwamondo, Fulufhelo V ; Marwala, T Date: Jan 2019 The Partitioning Around Medoids (PAM) clustering algorithm is well-known for its robustness and accuracy, but it is computationally expensive. This paper proposes a fast and accurate version, named PAM-lite. Like CLARA which also addresses ... Read more
Paper based microfluidic devices for environmental diagnostics

Author: Govindasamy, K ; Potgieter, S ; Kumar, S ; Land, K ; Muzenda, E Date: Sep 2012 Microfluidics has found widespread application in the fields of molecular biology, DNA analysis and most recently, point of care diagnostics. We present a paper based microfluidic device for rapid, in-the-field detection of pathogenic bacteria ... Read more
A paper-polymer centrifugal device for low-cost sample pre-concentration and colorimetric lateral flow assay enhancement

Author: Wiederoder, MS ; Smith, S ; Madzivhandila, P ; Mager, D ; Moodley, K ; DeVoe, DL ; Land, KJ Date: Oct 2016 This study describes a novel hybrid paper-polymer centrifugal microfluidic device for pre-concentration of E.coli and lateral flow immunoassay enhancement for water quality verification. The device balances rotational centrifugal force with ... Read more
Parameter and input data uncertainty estimation for the assessment of water resources in two sub-basins of the Limpopo River Basin

Author: Oosthuizen, Nadia ; Hughes, DA ; Kapangaziwiri, Evison ; Mwenge Kahinda, Jean-Marc ; Mvandaba, Vuyelwa Date: Jul 2017 The demand for water resources is rapidly growing, placing more strain on access to water and its management. In order to appropriately manage water resources, there is a need to accurately quantify available water resources. Unfortunately, ... Read more
Parameter dependence of the decoherence of orbital angular momentum entanglement in atmospheric turbulence

Author: Hamadou Ibrahim, A ; Roux, FS ; Konrad, T Date: Aug 2011 he orbital angular momentum (OAM) state of light can potentially be used to implement higher dimensional entangled systems for quantum communication. Unfortunately, optical fibers in use today support only modes with zero OAM values. Free-space ... Read more
A parameter for the selection of an optimum balance calibration model by Monte Carlo simulation

Author: Bidgood, Peter M ; Nel, AL Date: Sep 2013 The current trend in balance calibration-matrix generation is to use non-linear regression and statistical methods. Methods typically include Modified-Design-of-Experiment (MDOE), Response-Surface-Models (RSMs) and Analysis of Variance (ANOVA). ... Read more
Parameters optimization, microstructure and micro-hardness of silicon carbide laser deposited on titanium alloy

Author: Adebiyia, DI ; Fatoba, O ; Pityana, Sisa L ; Popoola P Date: Jun 2016 Silicon carbide (SiC), has excellent mechanical properties such as high hardness and good wear resistance, and would have been a suitable laser-coating material for titanium alloy to enhance the poor surface hardness of the alloy. However, ... Read more
Parametric identification of the model with one predator and two prey species

Author: Shatalov, M ; Greeff, JC ; Joubert, SV ; Fedotov, I Date: Sep 2008 In this paper a mathematical model describing the interaction of a lion population with that of the zebra and wildebeest populations is considered. The traditional method uses a model with known coefficients and a CAS numerical routine to ... Read more
Parent run science clubs: A case study at Nooitgedacht 88 primary school

Author: Butgereit, L Date: Dec 2006 Parent Run Science Clubs: A case study at Nooitgedacht 88 Primary School is a presentation case study presentation that will facilitate national, economic and social improvement through human capital development Read more
Part-of-speech effects on text-to-speech synthesis

Author: Schlunz, Georg I ; Barnard, E ; Van Huyssteen, GB Date: Nov 2010 One of the goals of text-to-speech (TTS) systems is to produce natural-sounding synthesised speech. Towards this end various natural language processing (NLP) tasks are performed to model the prosodic aspects of the TTS voice. One of the ... Read more
Part-of-speech tagging and chunking in text-to-speech synthesis for South African languages

Author: Schlunz, Georg I ; Dlamini, Nkosikhona ; Kruger, Rynhardt P Date: Sep 2016 Text-to-speech synthesis can be an empowering communication tool in the hands of the print-disabled or augmentative and alternative communication user. In an effort to improve the naturalness of synthesised speech – and thus enhance the ... Read more
Particle capturing performance of South African non corrosive samplers

Author: Pretorius, C Date: May 2010 In view of the international drive to eliminate silicosis, it is critical that reliable and consistent results are obtained from respirable dust sampling and analysis so that effective control measures can be implemented on mines. Two locally ... Read more
Particle variations and effect on the microstructure and microhardness of Ti6al4V hybrid metal matrix system

Author: Akinlabi, ET ; Nyembwe, KD ; Pityana, Sisa L ; Shongwe, MB ; Ochonogor, OF Date: Jan 2017 Manufacture of hybrid Ti6Al4 V alloy systems for application specifically in hot parts of turbine engines has been a challenge in recent years. This is due to the need to increase efficiency and reduce combustion rate and emission. In this ... Read more
Partitioning of a scaled shallow-buried near-field blast load

Author: Reinecke, John D ; Beetge, FJ ; Horsfall, I ; Miyambo, Mangalani Date: Jul 2015 Buried blast threats have been used for many years in both conventional and unconventional warfare. They are cheap, easily hidden, remain viable for extremely long periods after deployment and are effective, focusing the resulting blast ... Read more
Passive remediation of acid mine drainage using cryptocrystalline magnesite: a batch experimental and geochemical modelling approach

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Oct 2015 Acid mine drainage is generated when mining activities expose sulphidic rock to water and oxygen leading to generation of sulphuric acid effluents rich in Fe, Al, SO (Sup4) and Mn with minor concentrations of Zn, Cu, Mg, Ca, Pb depending on ... Read more
Path dependent models to predict property changes in graphite irradiated at changing irradiation temperatures

Author: Kok, S Date: Oct 2010 Property changes occur in materials subjected to irradiation. The bulk of experimental data and associated empirical models are for isothermal irradiation. The form that these isothermal models take is usually closed form expressions in terms ... Read more

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