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Browsing by Author "Smit, Jacoba E"

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Artificial vesicles with incorporated photosynthetic materials for potential solar energy conversion systems

Author: Smit, Jacoba E ; Grobler, AF ; Karsten, AE ; Sparrow, RW Date: Jul 2009 Currently the primary source of energy for industrial and domestic use is based on fossil fuels. The supplies of these fuels are limited and are becoming depleted. Thus there is a search for alternative and more sustainable energy sources. ... Read more
An assessment of the role of the k-e vertical mixing scheme in the simulation of Southern Ocean upper dynamics

Author: Boodhraj, K ; Vichi, M ; Smit, Jacoba E Date: Nov 2016 Following the work done by Reffrey, Calone and Bourdalle-Badie (2015) we implemented a one dimensional (1D) ocean physical model in the sub-Antarctic Southern Ocean using the Nucleus for the European Modelling of the Ocean(NEMO) model. The ... Read more
Comparative attenuation spectra of liquid skin-like phantoms

Author: Singh, A ; Smit, Jacoba E ; Karsten, AE ; Grobler, AF ; Sparrow, RW Date: Sep 2010 This study aims to extract and compare attenuation coefficients of different liquid skin-like phantoms representing Skin Types 1 to V1 with two methods, Spectrophotometric and Integrating Sphere methods. The correlation between the results ... Read more
Estimation of stimulus attenuation in cochlear implants

Author: Smit, Jacoba E ; Hanekom, T ; Hanekom, JJ Date: Mar 2009 Neural excitation profile widths at the neural level, for monopolar stimulation with Nucleus straight and contour arrays respectively, were simulated using a combined volume-conduction-neural model. The electrically evoked compound action ... Read more
Forward and reverse middle ear frequency responses with various terminal loads

Author: Thejane, T ; Marwala, T ; Smit, Jacoba E ; Nelwamondo, Fulufhelo V Date: Sep 2012 An analog network model of the human middle ear is used to study the effect of terminal loads on the middle ear frequency response. A new transformer ratio value is computed and used to improve the model of the middle ear through the use of ... Read more
An FTIR study on the chlorophyll and apoprotein aggregation states in LHCII due to solvent effects

Author: Smit, Jacoba E ; Prinsloo, LC ; Nel, JM Date: Jul 2012 Photosynthesis provides us with the most abundant and efficient light-harvesting systems found in nature. The photosynthetic process is very much dependent on the aggregation state of the chlorophylls and secondary conformational structure ... Read more
Harvesting sunlight energy: a biophysics approach

Author: Smit, Jacoba E ; Grobler, AF ; Sparrow, RW Date: Apr 2011 The most efficient light harvesting and energy transfer systems are found in nature as part of the photosynthesis process. In the photosynthetic system light energy is absorbed by antenna chlorophylls and this energy is then passed onto a ... Read more
Improving broiler lifestyle: a CFD approach

Author: Humbert, U ; Wessels, GJC ; Smit, Jacoba E ; Ubbink, O Date: Jan 2014 Climate change poses environmental risks which can negatively affect livestock production. To circumvent this, it is possible to move livestock into environmentally controlled animal housings. In South Africa, this is practiced in the broiler ... Read more
Influence of the auditory canal number of segments and radius variation on the outer ear frequency response

Author: Thejane, T ; Nelwamondo, Fulufhelo V ; Smit, Jacoba E ; Marwala, T Date: Jan 2012 A lumped transmission line model of the auditory canal is modified to study the influence of the number of segments used and the variation of the radius on the outer ear frequency response. A new second order polynomial is used to map the ... Read more
Influence of variation in eumelanin content on absorbance spectra of liquid skin-like phantoms

Author: Smit, Jacoba E ; Grobler, AF ; Sparrow, RW Date: Jan 2011 The attenuation behaviour of two different types of skin-like phantoms representing the range of Skin Types I to VI were investigated and compared to real human skin. Intralipid and PheroidTM artificial lipid membrane vesicles respectively ... Read more
Influence of variation in melanin content on absorbance spectra of liquid skin phantoms

Author: Smit, Jacoba E ; Karsten, AE ; Grobler, AF ; Sparrow, RW Date: Sep 2010 This presentation looked at the influence of variation in melanin content on absorbance spectra of liquid skin phantoms. Reasons for studying melanin, plus skin pigments, melanocytes, melanosomes, and melanin in particular, are discussed. The ... Read more
Investigating the turbulence response of a 1-D idealized water column located in the sub-Antarctic zone with focus on the upper ocean dynamics

Author: Boodhraj, Kirodh ; Vichi, M ; Smit, Jacoba E Date: Sep 2017 A one-dimensional ocean physical model was implemented in the sub-Antarctic Southern Ocean using the Nucleus for the European Modelling of the Ocean (NEMO) model. It was used to examine the effects of the turbulence response of the simulation ... Read more
Modelled temperature-dependent excitability behaviour of a generalised human peripheral sensory nerve fibre

Author: Smit, Jacoba E ; Hanekom, T ; Hanekom, JJ Date: Sep 2009 The objective of this study was to determine if a recently developed human Ranvier node model, which is based on a modified version of the Hodgkin-Huxley model, could predict the excitability behaviour in human peripheral sensory nerve fibres ... Read more
Modelling and verification of melanin concentration on human skin type

Author: Karsten, AE ; Smit, Jacoba E Date: Mar 2012 Lasers are used in the minimalistic or noninvasive diagnosis and treatment of skin disorders. Less laser light reaches the deeper skin layers in dark skin types, due to its higher epidermal melanin concentration compared with lighter skin. ... Read more
Phantom skin absorption coefficients from spectrophotometric and integrating sphere methods: preliminary comparative results

Author: Smit, Jacoba E ; Singh, A ; Tshoke, I ; Grobler, AF ; Sparrow, RW Date: Dec 2010 Minimalistic or non-invasive diagnosis and treatment of skin disorders requires accurate information regarding skin optical properties. Spectrophotometric and Integrating Sphere (IS) methods are commonly used to extract information regarding ... Read more
Potential sustainable energy source: Pheroid™ with incorporated light harvesting materials

Author: Smit, Jacoba E ; Grobler, AF ; Sparrow, RW Date: 01 Sep 2010 The most efficient light harvesting and energy transfer systems are found in nature as part of the photosynthesis process. By extracting these system fragments and maximising their organisational structure, researchers are developing similar ... Read more
Predicting human epidermal melanin concentrations for different skin tones

Author: Smit, Jacoba E ; Karsten, AE ; Sparrow, RW Date: Jul 2011 In the past 50 years lasers has found numerous applications in medicine. One of their advantages is their use for minimalistic or non-invasive diagnosis and treatment. Often that means light penetration through skin and the correct dose ... Read more
Unravelling complex interactions between urbanisation and coastal fisheries using a system dynamics approach

Author: Smit, Jacoba E ; Botha, Gerda N ; Arabi, Sumaiya ; Slinger, JH ; Taljaard, Susan ; Weerts, Steven P Date: Nov 2017 Coastal zones are amongst the most heavily populated and exploited areas in many parts of the world. Burgeoning coastal urbanization and resource use is increasingly giving rise to conflict among users of coastal resources. One such conflict ... Read more

Now showing items 1-18 of 18

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