ResearchSpace
→
Browsing by Author

Browsing by Author "Katumba, G"

Now showing items 1-10 of 10

Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectic properties - SAIP Poster

Author: Katumba, G ; Baisitse, T ; Forbes, A ; Olumekor, L ; Wackelgard, E Date: Jul 2006 The Bruggeman and Maxwell-Garnett effective medium approximations (EMAs) have been used to investigate optical properties of composite materials. The EMA assumptions are based on random unit cell models in which metal particles are embedded ... Read more
Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectric properties

Author: Katumba, G ; Forbes, A Date: Aug 2009 The Bruggeman and Maxwell-Garnett effective medium approximations have been used widely to investigate optical properties of many different composite materials. In most cases, the effective medium approximation assumptions are based on random ... Read more
Characterisation of InAs-based epilayers by FTIR spectroscopy

Author: Baisitse, TR ; Forbes, A ; Katumba, G ; Botha, JR ; Engelbrecht, JAA Date: 2008 In this paper, infrared reflectance spectroscopy was employed to extract information on the optical and electrical properties of metal organic vapour phase epitaxial (MOVPE) grown InAs and InAsSb epilayers. These epitaxial layers were grown ... Read more
Fabrication and characterisation of selective solar absorber surfaces prepared by sol-gel technique

Author: Katumba, G ; Olumekor, L ; Forbes, A ; Wackelgard, E Date: Jul 2006 The investigation and development of carbon-silica composites has been going on for some time. Different applications such as adsorbents, biosensors, templates and solar absorbers have emanated from these studies. The concept of using solar ... Read more
Fabrication of selective solar absorbers using pulsed laser deposition

Author: Yalisi, B ; Katumba, G ; Forbes, A ; Pillay, SR Date: Jun 2009 Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range from 2.5µm to the ... Read more
FTIR and Raman spectroscopy of carbon nanoparticles in SiO2, ZnO and NiO matrices

Author: Katumba, G ; Mothibinyane, TR ; Mwakikunga, Bonex W Date: Nov 2008 Coatings of carbon nanoparticles dispersed in SiO2, ZnO and NiO matrices on aluminium substrates have been fabricated by a sol–gel technique. Spectrophotometry was used to determine the solar absorptance and the thermal emittance of the ... Read more
Selective solar absorbers: A cost effective solution for access to clean energy in rural Africa

Author: Katumba, G ; Olumekor, L ; Forbes, A Date: Nov 2008 In this present era of global energy crisis there is a greater need to turn to renewable, cost effective and sustainable energy resources. In rural Africa, in particular, the demand for domestic energy is even higher. This is exacerbated by ... Read more
Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices

Author: Katumba, G ; Makiwa, G ; Olumekor, L ; Forbes, A Date: Jan 2008 It is possible to design an optical material, through control of the substrate and coatings, to absorb a large fraction of the solar spectrum and to emit very little radiation energy in the near and far infra-red wavelength range. This requires ... Read more
Synthesis and optical characterization of C-SiO2 and C-NiO sol-gel composite films for use as selective solar absorbers

Author: Makiwa, G ; Katumba, G ; Olumekor, L Date: Aug 2008 The authors present a cheaper and environmentally friendly method to fabricate efficient spectrally selective solar absorber materials. The sol-gel technique was used to fabricate carbon-silica (C-SiO2) and carbon-nickel oxide (C-NiO) composite ... Read more
Synthesis of tungsten oxide nano structures by laser pyrolysis

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Erasmus, RM ; Katumba, G ; Masina, Bathusile N Date: 2008 Since the proposal to synthesise materials by laser assisted pyrolysis in the 1970s, and its practical realisation in 1982, a number of researchers have used this method in obtaining nano-powders from liquid droplets. This study revisits this ... Read more

Now showing items 1-10 of 10

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.

Browsing by Author "Katumba, G"

Browsing by Author "Katumba, G"

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Social Connect